阅读说明：本技术 轮椅制动系统 (Wheelchair braking system ) 是由 刘荣培 于 2015-11-20 设计创作，主要内容包括：本发明涉及轮椅制动系统,更详细地,涉及如下的轮椅制动系统,即,在乘坐者从轮椅起身的情况等平时,制动器以锁定状态来进行工作,而仅在乘坐者坐在轮椅上或者轮椅被折叠的情况下,使制动器自动解锁,从而使轮椅仅在乘坐者坐在轮椅上或者被折叠的情况下可以移动,由此可预先防止当乘坐轮椅或者从轮椅下来时有可能发生的跌伤的安全事故。(The present invention relates to a wheelchair brake system, and more particularly, to a wheelchair brake system in which a brake is operated in a locked state at ordinary times such as when a rider gets up from a wheelchair, and the brake is automatically unlocked only when the rider sits on the wheelchair or the wheelchair is folded, so that the wheelchair can be moved only when the rider sits on the wheelchair or the wheelchair is folded, thereby preventing a possible accident of falling down when the rider sits on or gets off the wheelchair.)

1. A wheelchair braking system is characterized in that,

the method comprises the following steps:

a brake formed on a tire of the wheelchair; and

the brake operation control unit includes:

a cable, one end of which is connected with the brake; and

a brake switching means coupled to the other end of the cable, for operating the cable connected to the brake to unlock the brake only when the occupant is in the wheelchair and the safety device is used, and for returning the cable to the locked state when the safety device is not used,

so that the brake switching member is connected to the brake for locking and unlocking the brake,

in the case that the safety device is a safety lever, the stopper maintains a locked state since the tension of the cable is directed toward the stopper before the safety lever is locked, one end of the cable is connected to the stopper and thus is a fixed end, but the other end can be combined with a tension adjusting member to adjust the tension,

one end of the cable is connected to the inside of the safety lever in combination with the brake, and is connected to the tension adjusting part through a pulley,

when the rider is in the wheelchair and locks the safety lever, the control cable formed inside the safety lever is pressed, and the tension adjusting portion connected by the pulley is in a fixed state, so that the cable in the brake cable direction is pulled and tension in the opposite direction is generated in the brake cable, and the tension of the cable is changed from the brake direction to the opposite direction, thereby changing the brake from the locked state to the unlocked state,

when the safety lever is unlocked, the tension of the cable acting inside the safety lever is removed, and the tension of the cable is redirected toward the brake, thereby shifting the brake from the unlocked state to the locked state.

Technical Field

The present invention relates to a wheelchair brake system, and more particularly, to a wheelchair brake system in which a brake is operated in a locked state at ordinary times such as when a rider gets up from a wheelchair, and the brake is automatically unlocked only when the rider sits on the wheelchair or the wheelchair is folded, so that the wheelchair can be moved only when the rider sits on the wheelchair or the wheelchair is folded, thereby preventing a possible accident of falling down when the rider sits on or gets off the wheelchair.

Background

Generally, a wheelchair is a unit that is moved by a physically handicapped patient sitting thereon, and is moved by a patient directly pulling the wheelchair or a protection person pushing the wheelchair at the rear side.

Since a wheelchair is carried by a physically handicapped patient, there is a high risk that the wheelchair is carried or taken out of the wheelchair, and an accident that the patient falls from the wheelchair and is injured or falls frequently occurs due to movement of the wheelchair while the wheelchair is carried or taken out of the wheelchair.

In order to solve the above problems, a wheelchair having a brake mounted thereon has been developed, but in the case of a conventional wheelchair brake system, the brake of the wheelchair is operated only when the brake is manually operated as in the case of a bicycle, and thus there is a problem in that a fall accident cannot be prevented.

Disclosure of Invention

Technical problem

The present invention has been made to solve the above problems, and an object of the present invention is to provide a wheelchair braking system in which a brake is operated in a locked state to stop movement of a wheelchair in a state where an occupant is not seated in the wheelchair, and the brake is unlocked to move the wheelchair only in a state where the occupant is fully seated in the wheelchair, thereby preventing a fall accident caused by movement of the wheelchair when the occupant is seated in or removed from the wheelchair.

Means for solving the problems

In order to achieve the above object, a wheelchair brake system according to the present invention includes: a brake formed on a tire of the wheelchair; and a brake operation control unit connected to the brake, for locking and unlocking the brake, wherein the brake is always in a locked state, and the brake operation control unit detects the state when a rider gets in a wheelchair or the wheelchair is folded, and controls the brake to be switched from the locked state to the unlocked state.

In accordance with the present invention, the brake operation control unit includes: a connecting member having one end elastically connected to the stopper; and a brake switching member to which the other end of the link member is fixedly coupled, wherein the brake switching member operates the link member connected to the brake to unlock the brake when a rider gets in a wheelchair, and restores the link member to restore the brake to a locked state when the rider gets up.

The present invention is characterized in that the connecting member is formed of a rod or a cable, and the brake switching member is operated automatically by being non-electrically operated or electrically operated.

The present invention is characterized in that, when the brake switching member is a non-electric type, the brake switching member includes: a detection frame formed at the lower part of the wheelchair seat and used for containing the other end of the cable in the interior in a fixed mode and connecting the other end of the cable with the wheelchair seat; and an upper plate coupled to the sensing frame, for converting a tension direction of the cable by applying pressure to the cable received in the sensing frame when the occupant sits on the wheelchair seat.

The present invention is characterized in that the upper plate has a cable housing portion, and the cable is in a state of not receiving a pressure applied by the cable housing portion when the occupant is not in the wheelchair, and when the occupant is in the wheelchair, the upper plate moves downward and causes the cable housing portion to apply a pressure to the housed cable, and when the cable receives a pressure, a tension is generated in the cable in a direction opposite to a direction of the brake, and the locked brake is released to unlock the brake.

The present invention is characterized in that the inspection frame and the upper plate are divided into a plurality of units, at least one of the cables connected to the respective units is connected to a brake, and the brake is switched from a locked state to an unlocked state when at least one of the units is operated.

In the process of operating the brake, the brake can be unlocked even if only one unit is operated, and the brake can be unlocked under the condition that all the units are operated.

In the present invention, when the brake switching member is an electric brake, the brake switching member includes: a detection frame formed at the lower part of the wheelchair seat, for fixing and accommodating the other end of the cable inside, and having an electric driving part for converting the direction of tension by electrically rotating the cable; and an upper plate coupled to the detection frame and having a sensor for detecting a wheelchair-riding motion of a rider.

The sensor may be a pressure detection sensor, an infrared sensor, an optical sensor, or a combination thereof.

The present invention is characterized in that the electric drive unit includes: the electric pulley is used for converting the direction of the cable and rotating the cable; a motor for providing a rotational force for driving the electric pulley; and a driving controller for controlling a rotational force of the motor, wherein the motor is driven by detecting a riding motion of a rider from a pressure detection sensor provided on the upper plate, and the motor is rotated to apply a tension in an opposite direction, thereby unlocking the brake, and the motor is driven in an opposite direction by detecting a getting-off motion of the rider, thereby rotating the motor pulley back to a home position to apply the tension in a reverse direction to the brake, thereby locking the brake.

In addition, the present invention is characterized in that the electric drive unit further includes sensor means such as an acceleration sensor and an inclination sensor, and the electric drive unit performs not only a simple switching operation of locking and unlocking the brake, but also a constant speed travel of the wheelchair by automatically operating the brake for safety when the wheelchair is traveling at an excessively high speed or in an inclined manner.

ADVANTAGEOUS EFFECTS OF INVENTION

The invention has the following effects: in a state where the occupant is not seated in the wheelchair, the brake is operated in a locked state to stop the movement of the wheelchair, and only when the occupant is fully seated in the wheelchair, the brake is unlocked to move the wheelchair.

Drawings

Fig. 1 is a device configuration view schematically showing a wheelchair according to a preferred embodiment of the present invention.

Fig. 2 is a schematic view showing an apparatus structure of a wheelchair according to still another embodiment of the present invention.

Fig. 3 schematically shows a state in which the inspection frame and the upper plate of the preferred embodiment of the present invention are divided into 4 units.

Fig. 4 schematically shows a state in which the inspection frame and the upper plate of the preferred embodiment of the present invention are divided into 2 units.

Figure 5 diagrammatically shows actuation of the brake of the wheelchair of figure 3.

Fig. 6 schematically shows a state in which the wheelchair is folded.

Fig. 7 schematically shows a wheelchair brake system according to another embodiment of the present invention, and fig. 8 is a detailed structural view of fig. 7.

Fig. 9 schematically shows a wheelchair driven by an electric motor according to a preferred embodiment of the present invention.

Fig. 10 schematically shows a brake according to a preferred embodiment of the present invention.

Fig. 11 schematically shows a state in which a switching member of a preferred embodiment of the present invention is configured by a safety lever or a safety belt as a safety device, fig. 12 to 15 are detailed views showing a case in which the switching member of fig. 11 is the safety lever, and fig. 16 to 18 are detailed views showing a case in which the switching member of fig. 11 is the safety belt.

Fig. 19 to 21 schematically show the structure of the foot board of the present invention, which functions as a brake switching member.

Detailed Description

In order to achieve the above object, a wheelchair braking system of the present invention includes: a brake formed on a tire of the wheelchair; and a brake operation control unit connected to the brake, for locking and unlocking the brake, wherein the brake is normally in a locked state, and performs a synchronous operation when a rider operates a safety device in a wheelchair, and the brake operation control unit detects the synchronous operation to control the brake to be switched from the locked state to the unlocked state.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a device configuration view schematically showing a wheelchair according to a preferred embodiment of the present invention.

Referring to fig. 1, the wheelchair brake system of the present invention is characterized by comprising: a brake 20 formed on a tire of the wheelchair; and a brake operation control unit 10 connected to the brake, for locking and unlocking the brake, wherein the brake is always in a locked state, and when a rider is in a wheelchair or the wheelchair is folded, the brake operation control unit detects the state and controls the brake to be switched from the locked state to the unlocked state.

The brake operation control unit 10 may include: a connecting member 110 having one end connected to the stopper; and a brake switching member 120 coupled to the other end of the link member, for operating the link member connected to the brake to unlock the brake when the rider gets on the vehicle, and for restoring the link member to restore the brake to the locked state when the rider gets up.

That is, when the occupant is seated in the wheelchair, the brake switching means 120 switches the brake to the unlocked state, and when the occupant seated in the wheelchair is lifted from the wheelchair or the folded wheelchair is unfolded, the switching operation for switching the brake to the locked state is performed by returning the connection means to the original state.

More specifically, the connection member 110 may be formed of a cable or a rod, and the cable is set to a state of providing tension to the brake in a state where there is no occupant, thereby maintaining the brake in a locked state. The cable means a member in the form of a wire (wire).

That is, the cable is constantly kept in a state where tension is applied so that the brake is locked, and thus the brake is constantly kept in an operating state. However, when the occupant is in the wheelchair, the cable is automatically pulled in the opposite direction to unlock the brake.

The brake switching member 120 may be non-electric or electric.

First, when the brake switching member 120 is a non-electric type, it may include: a detection frame formed at the lower part of the wheelchair seat and used for containing the other end of the cable in the interior in a fixed mode and connecting the other end of the cable with the wheelchair seat; and an upper plate coupled to the sensing frame, for converting a tension direction of the cable by applying pressure to the cable received in the sensing frame when the occupant sits on the wheelchair seat.

More specifically, the upper plate includes a cable housing portion, and the cable is in a state of not receiving a pressure applied by the cable housing portion in a state where the occupant is not seated in the wheelchair, and the upper plate moves downward and causes the cable housing portion to apply a pressure to the housed cable in a state where the occupant is seated in the wheelchair.

As described above, when the cable receives a pressure, a tension in the opposite direction to the brake is generated in the cable, and the locked brake is released to unlock the brake.

Therefore, the brake is always kept in the locked state in a state where the occupant is not in the wheelchair, and the brake is operated to be unlocked only when the occupant is in the wheelchair.

Fig. 2 is a schematic view showing an apparatus structure of a wheelchair according to still another embodiment of the present invention.

Referring to fig. 2, the link 110 may be in the form of a rod, instead of a cable, and one end of the link may be connected to the brake actuation control part 20 and may include a plurality of joints.

The operation control unit 20 is elastically coupled to a lower portion of the wheelchair seat in a plate shape, and when the occupant gets on the wheelchair, the operation control unit is elastically displaced toward the lower portion, and when the occupant gets off the wheelchair, the operation control unit returns to the original position by a restoring force.

The connecting member has a central axis coincident with the central axis of the tire, and the central axis is connected to the brake of the tire via a cable.

Thus, when the occupant is not in the wheelchair, the brake is brought into the locked state by applying the initial tension, and when the occupant is in the wheelchair, the operation control unit 20 is elastically displaced downward, and the connecting member integrated by the elastic displacement is displaced, so that the cable connected to the brake is acted in the direction opposite to the initial tension direction, thereby switching the brake from the locked state to the unlocked state.

Fig. 3 schematically shows a state in which the inspection frame and the upper plate of the preferred embodiment of the present invention are divided into a plurality of cells.

This embodiment shows the case where the upper plate is divided into 4 units, as shown in fig. 4, and may be divided into 2 units, and may be divided into a plurality of numbers according to design, as is apparent.

Referring to fig. 3, the inspection frame is divided into 4 units, and pulley assemblies are formed inside the respective units, and coupled to cables, which are coupling members, through the pulley assemblies.

The sheave assembly may include: the main pulley directly influences the locking and unlocking of the brake; and a sub-pulley which does not directly affect the locking and unlocking of the brake, but connects the cable by converting the direction of the cable.

2 of the main pulleys are formed in pairs of 4 units with a predetermined interval, and one of the main pulleys connects the rope to the brake through the sub-pulley in a state where the rope is wound at least once.

The number of the divided units is the same, the cable can also be composed of 4, each unit is combined with one cable, and in the 4 units, 2 cables are respectively connected with 2 brakes in a paired mode.

In this embodiment, the first rope combined with the first unit and the fourth rope combined with the fourth unit are connected with the first brake in a pair manner, and the second rope combined with the second unit and the third rope combined with the third unit are connected with the second brake in a pair manner.

At the beginning of the 4 cables, a thread adjusting part is formed, which can be used to adjust the tension of each cable.

Also, the upper plate is divided into 4. Each upper plate may include a cable receiving portion and a coupling member coupled to the sensing frame at a lower portion of the plate.

The coupling member is formed of a spring for elastic coupling and coupled to the sensing frame such that the upper plate can move up and down according to whether the occupant sits on the upper plate.

Further, the cable housing may include: a projecting rod projecting toward the lower portion of the plate; and a cable housing groove formed in the protrusion rod.

Since the rope housing grooves need to house the rope wound around the pair of main pulleys, 2 rope housing grooves can be formed as shown in fig. 2.

As described above, the upper plate is divided into 4, a pair of brakes are connected to 2 cables, respectively, and the brakes are unlocked if the tension of the brakes connected to the cables is adjusted to apply pressure to one of the 4 units.

For example, the brakes may be unlocked by adjusting the cable tension to apply pressure to one cell connected to a pair of brakes, respectively, or to release the brakes by applying pressure to 4 cells each.

Figure 5 schematically illustrates the actuation of the wheelchair brake of figure 3.

Referring to fig. 5, in an initial state where the occupant is not seated in the wheelchair, the brake is maintained in a locked state by maintaining the tension of the cable applied to the brake.

One end of the cable is combined with the brake, and the other end of the cable is connected with the cable adjusting part of the detection frame. The cable adjusting part has a structure capable of adjusting the tension of the cable by adjusting the screw thread, and functions as a fixed end, and the brake combining end as one end of the cable is an elastic end, so that the tension is converted into the opposite direction by the external force.

When the occupant is seated in the wheelchair, the upper plate elastically coupled to the sensing frame moves downward, and the cable accommodated in the accommodating groove of the cable accommodating portion is pressed downward.

As described above, when the cable is pressed downward, the main pulley rotates by a distance corresponding to the pressed force, and since the other end is a fixed end, tension is generated by pulling from the actuator coupling end, which is an elastic end, and the direction of the tension acting in the brake direction is changed to the opposite direction, so that the brake is changed from the locked state to the unlocked state.

Wherein the upper plate is divided into 4 units, one brake is in a state of being connected to 2 cables, and the 2 cables are connected to 2 units, so that, in the case where at least one of the 4 units is pressurized, the direction of tension applied to the brake is changed to unlock the brake, and thus, the brake is unlocked only in a state where the occupant is seated in the wheelchair.

In the 4 units, when the plurality of units are under pressure, whether to unlock the brake can be freely determined by adjusting the tension of the cable.

Figure 6 shows schematically the wheelchair in a folded condition.

Referring to fig. 6, in the case of the folding wheelchair, tension pulling the cable due to bending occurs, and since the other end is a fixed end, tension pulling from the brake coupling end, which is an elastic end, causes the direction of tension acting in the brake direction to be changed to the opposite direction, and the brake is changed from the locked state to the unlocked state.

Fig. 7 schematically shows a wheelchair brake system according to another embodiment of the present invention, and fig. 8 is a detailed structural view of fig. 7.

Referring to fig. 7 and 8, in the wheelchair brake system according to the present invention, the brake may be formed of a blocking rod, and the blocking rod passes between the spokes and is caught by the spokes in a state where the occupant is not seated in the wheelchair, thereby maintaining the locked state of the wheelchair.

When the occupant is in the wheelchair, the stopper rod moves inward elastically and moves inward into the tire, and thus the brake is switched from the locked state to the unlocked state.

Wherein, the brake action control portion includes: a plate spring formed at a lower portion of the wheelchair seat; a gear box for converting the elastic force based on the plate spring into mechanical displacement; and an elastic member formed at a rear end of the gear case, the elastic member being compressed corresponding to a displacement converted by the gear case, thereby moving the blocking rod inward.

When the rider gets off the vehicle, the elastic force of the plate spring is removed to mechanically displace the gear assembly to return to the original position by the restoring force, and when the compressed elastic member returns to the original position by the restoring force, the blocking lever is switched to the locked state by passing the spoke.

In the following, the case where the brake switching member is an electric switching member is observed.

Fig. 9 schematically shows a wheelchair driven by an electric motor according to a preferred embodiment of the present invention.

Referring to fig. 9, a brake switching part of an embodiment of the present invention may include: a detection frame formed at the lower part of the wheelchair seat, for fixedly accommodating the other end of the cable therein, and having an electric driving part for converting the direction of tension by electrically rotating the cable; and an upper plate coupled to the detection frame and having a pressure detection sensor for detecting a wheelchair-riding motion of the rider.

The electric driving part may include: the electric pulley is used for converting the direction of the cable and rotating the cable; a motor for providing a rotational force for driving the electric pulley; and a driving controller for controlling a rotational force of the motor.

The driving controller may drive the motor by detecting a riding motion of the occupant from a pressure detection sensor provided in the upper plate, and rotate the electric pulley in a direction opposite to a direction of tension.

As a result, the tension acting in the brake direction is operated in the opposite direction, and the brake is switched from the locked state to the unlocked state. Specifically, the brake locking and unlocking principle is the same as the mechanical type, and thus a detailed description will be omitted.

When the detected value of the pressure detection sensor changes due to the occupant getting off the wheelchair, the drive controller returns the electric pulley to the home position by rotating the electric pulley, thereby changing the direction of the tension to the direction of the brake again and changing the brake from the unlocked state to the locked state.

In which the sensing frame and the upper plate can be divided into a plurality of units as in the mechanical type to unlock and lock the brake only in the case where the occupant fully rides in the wheelchair or fully disembarks from the wheelchair.

The electric drive unit may further include sensor means such as an acceleration sensor and an inclination sensor.

Thus, the electric drive unit not only performs a simple switching operation for locking and unlocking the brake, but also automatically operates the brake for safety when the wheelchair is traveling at an excessive speed or in an inclined manner.

That is, in the case of a high speed or a downhill, when the sensor unit detects the above, the brake is not completely switched to the locked state, but a part of the brake is operated to provide a braking force to reduce the speed, thereby safely driving the wheelchair.

The electric drive unit further includes an acceleration sensor for measuring the speed of the wheelchair, and the electric drive unit drives the electric pulley to operate the brake when the speed exceeds a set speed (for example, when the speed is set within a range of 5km to 10km per hour).

Wherein the driving of the electric pulley is controlled by adjusting the locking degree of the brake to be braked according to the speed exceeded, whereby safe driving can be secured.

Fig. 10 schematically shows a brake according to a preferred embodiment of the present invention.

The brake of the present invention may be in various forms, such as a brake plate-acting type as shown in fig. 10 (a), a caliper-acting type mainly applied to a stroller as shown in fig. 10 (b), a rim-braking type mainly applied to a bicycle as shown in fig. 10 (c), and a band-braking type as shown in fig. 10 (d).

Fig. 11 schematically shows a state in which a switching member according to still another embodiment of the present invention is configured by a safety lever or a safety belt as a safety device, fig. 12 to 15 are detailed views showing a case in which the switching member of fig. 11 is the safety lever, and fig. 16 to 18 are detailed views showing a case in which the switching member of fig. 11 is the safety belt.

Referring to fig. 11, in the wheelchair braking system of the present invention, the brake may be unlocked only in a case where the occupant of the wheelchair sits on the wheelchair and locks the safety lever or the safety belt.

The wheelchair braking system of the present invention comprises: a brake 20 formed on a tire of the wheelchair; and a brake operation control unit 10 connected to the brake, for locking and unlocking the brake, wherein the brake is always in a locked state, and when a rider locks a safety lever or a safety belt while riding in a wheelchair, the brake operation control unit interlocked with the brake switches the brake from the locked state to an unlocked state by detecting the operation.

The brake operation control unit 10 includes: a connecting member 110 having one end connected to the stopper; and a brake switching member 120 coupled to the other end of the coupling member, for operating the coupling member coupled to the brake to unlock the brake when the occupant is seated in the wheelchair and the safety device is coupled, and returning the coupling member to the original position to re-lock the brake when the safety device is released and the wheelchair is folded.

That is, the brake switching means 120 performs a switching operation in which, when the occupant is coupled to the mounting device after riding in the wheelchair, the brake switching means 120 switches the brake to the unlocked state by applying pressure to the connection member to switch the tension applied to the brake in the opposite direction, and when the occupant riding in the wheelchair releases the safety device, the pressure applied to the connection member is removed to return the connection member to the original state in which the tension is applied in the brake direction by the restoring force, thereby switching the brake to the locked state.

More specifically, the connection member 110 may be in a cable or wire form capable of adjusting tension, and the cable is set to provide tension to the brake in a state where there is no occupant, thereby maintaining the brake in a locked state. The cable means a member in the form of a wire (wire).

That is, the cable is constantly kept in a state where tension is applied so that the brake is locked, and thus the brake is constantly kept in an operating state. However, when the occupant is seated in the wheelchair and locks the safety lever or wears the safety belt, the cable is pressed and pulled in the opposite direction by a distance corresponding to the displacement of the cable due to the pressing force applied to the connecting member, thereby unlocking the brake.

The brake switching member 120 may be non-electric or electric.

In the present invention, the operation and effect of unlocking and locking the brake by adjusting the tension of the cable are the same except that the brake switching member 120 may be constituted by a safety lever, a safety belt, or a foot pedal described later.

Fig. 12 shows a wheelchair structure in which a safety lever is formed, the safety lever 121 functions as a brake switching member 120, and the brake maintains a locked state because the cable is pulled toward the brake before the safety lever 121 is locked.

One end of the cable is connected to the stopper so that the one end of the cable is a fixed end, but the other end can be combined with a tension adjusting member to adjust the tension.

Also, one end of the cable is coupled to the inside of the safety lever in combination with the brake, and is coupled to the tension adjusting part through a pulley.

As shown in fig. 14 and 15, the cable may further include a coupling portion integrally coupled with a brake cable coupled from a brake and a control cable coupled to the tension adjusting portion, and 2 brake cables may be operated together according to the operation of the control cable through the coupling portion.

When the occupant gets into the wheelchair and locks the safety lever 121, the control cable formed inside the safety lever is pressed and the tension adjusting unit connected by the pulley is in a fixed state, so that the cable in the brake cable direction is pulled and tension in the opposite direction is generated in the brake cable, and the tension of the cable is changed from the brake direction to the opposite direction, thereby changing the brake from the locked state to the unlocked state.

When the safety lever 121 is unlocked, the tension of the cable acting inside the safety lever is removed, and the tension of the cable is redirected toward the brake, thereby switching the brake from the unlocked state to the locked state.

Therefore, since the brake is unlocked only in a state where the occupant is seated in the wheelchair and locks the safety lever 121, the safety of the occupant can be further enhanced.

The embodiment of fig. 13 shows a wheelchair structure in which a seat belt is formed, the seat belt 122 functions as a brake switching member 120, and the brake maintains a locked state because the tension of the cable is directed to the brake before the seat belt 122 is locked.

The embodiment of fig. 13 operates in the same manner as the embodiment of fig. 11, and switches the direction of the tension applied to the brake depending on whether or not the safety belt is worn, so that the brake is switched from the locked state to the unlocked state, and from the unlocked state to the locked state again.

In fig. 12 and 13, the seat belt is a buckle type seat belt, a cable connected to a brake is provided in a buckle input portion inside a coupling frame for fastening a buckle 122, and when the buckle 122 is coupled to the buckle input portion of the coupling frame in order to wear the seat belt, pressure is applied to the cable, and the direction of tension acting in the brake direction is changed to the opposite direction as the pressure is applied to the cable, so that the brake is changed from the locked state to the unlocked state.

Since the cable inside the coupling frame is coupled by the plurality of pulleys, pulling the cable corresponds to a distance that the cable is displaced inward by the pressure applied to the cable by the hook 122, and thus, the direction of the tension applied to the brake is reversed, and the brake is unlocked, and when the hook 122 is separated from the coupling frame, the cable that has received the pressure returns to the original position, and thus the tension applied to pull the cable is removed, and the tension applied to the cable is redirected to the brake, and thus the brake is locked.

Fig. 18 schematically shows a harness according to a further embodiment of the invention.

Referring to fig. 18, the coupling frame 123b includes a guide member 123c for converting the direction of the cable, and as the buckle 123a is coupled to the coupling frame 123b in an inserted manner, the guide member 123c generates a tensile force by displacing the cable, thereby converting the tensile direction of the brake to the opposite direction, thereby converting the brake from the locked state to the unlocked state.

More specifically, the guide member 123c includes a moving member 1231: the guide member 123C is mounted inside, and has 2 guide grooves A, B formed on the front and rear surfaces thereof so as to face each other, a front surface protruding portion C protruding upward of the front surface guide groove a and a rear surface protruding portion D protruding downward of the rear surface guide groove B and coupled to the cable, which are integrally formed, and the front surface protruding portion and the rear surface protruding portion are relatively moved along the guide grooves.

The moving member 1231 is moved by the rotation shaft, and the moving member has a basic elastic force by a spring, so that the front protrusion can be always positioned at the top of the front guide groove by the elastic force. Therefore, even if the front surface protruding portion is moved to the lower portion of the front surface guide groove by being combined with the catch 123a, the front surface protruding portion returns to the original position by the restoring force when the catch 123a is removed.

Since the catch 123a is inserted into the front surface of the moving member, when the catch 123a is inserted into the coupling frame 123b, the catch 123a is inserted so as to push the front surface protruding portion C downward, and the front surface protruding portion C moves downward along the guide groove a.

At this time, as the front surface protruding portion C moves downward, the rear surface protruding portion D, which moves relative to the front surface protruding portion C, moves upward along the rear surface guide groove B.

As a result, the cable coupled to the rear protrusion D is moved upward and pulled, and the direction of the cable tension generated in the direction of the brake is changed to the opposite direction, thereby changing the brake from the locked state to the unlocked state.

Next, when the latch 123a is separated from the coupling frame 123b, the moving member 1231 is returned to the home position by the restoring force of the spring, and thus the rear protrusion that performs the relative movement is also returned to the home position, and the tension direction of the cable is also returned to the home position, and thus the tension direction of the cable is returned to the brake, and the brake is switched from the unlocked state to the locked state.

Fig. 19 to 21 schematically show the structure of the foot board of the present invention, which functions as a brake switching member.

In the embodiment of fig. 19 to 21, the foot pedal functions as a brake switching member, and in the case where the foot pedal is in the folded state, the brake maintains the locked state because the tension of the cable is directed toward the brake.

When the occupant takes the wheelchair and deploys the footrest, the cable formed in the footrest receives pressure, and pressure in the opposite direction is generated in the cable, and the tension of the cable is switched from the brake direction to the opposite direction, thereby switching the brake from the locked state to the unlocked state.

The embodiment of fig. 19 is the simplest embodiment, and the brake is locked by adjusting the tension of the cable toward the brake based on the state in which the pedal plate 124 is folded, and the brake is switched from the locked state to the unlocked state by pulling the cable when the pedal plate 124 is unfolded and thus applying the tension of the cable in a direction opposite to the brake to separate the brake plates.

More specifically, 2 cables may constitute the connecting member 110, and as the foot pedal is folded up and down or left and right, the tensions of the first cable (blue) and the second cable (green) are relatively acted on, and in the folded state of the foot pedal, the first cable has no tension and the locked state of the brake is maintained only by the tension of the second cable, and if the foot pedal is unfolded, the tension is acted on only the first cable, and the second cable is changed to a non-tension state, so that the tension direction of the brake is changed to change the brake from the locked state to the unlocked state.

In the embodiment of fig. 20, the foot pedal 125 functions as a brake switching member 120, and a tension adjusting part 60 connected by a cable is further included between the foot pedal and the brake.

The tensioning portion 60 is connected to the brake 20 by a brake cable 115 and to a foot pedal 125 by a control cable 116.

The tension adjusting part 60 may include: a guide rail 610 fixedly arranged at the lower part of the wheelchair seat; and a sliding member 620 moving along the guide rail.

The sliding member 620 is connected at one end to the control cable 116 and at the other end to the brake cable 115.

Here, since the brake cable 115 is provided in a state of being tensioned in a brake direction, the sliding member 620 is affected by the tensioned brake cable. That is, in a state where the foot pedal 125 is folded, tension acts on the brake cable in the brake direction, and the brake maintains the locked state.

When the pedal plate 125 is unfolded from the folded state, the length of the brake cable 115 increases in the direction opposite to the brake direction, and the brake cable is tensioned in the direction opposite to the brake direction, so that the control cable is pressed and pulled, and the slide member 620 moves in the direction of the front surface of the wheelchair along the guide rail 610, so that the brake cable 115 is also pulled, and the tension direction acts in the opposite direction from the brake direction, thereby switching the brake from the locked state to the unlocked state.

Since the tension adjusting unit 60 is connected to 2 pedals 135 by one brake cable 115, the brake can be unlocked by operating the tension adjusting unit 60 only when the pedals are all spread.

When the foot pedal 125 is folded again, the length of the extended brake cable 115 is shortened to remove the tension, and thus the pressure applied to the control cable 116 is removed, and the sliding member 620 is moved to the home position by the restoring force, and thus the direction of the tension applied to the brake cable 115 is also turned to the direction of the brake to apply pressure to the brake plate, and the brake is changed from the unlocked state to the locked state.

Wherein the sliding member 620 is coupled to the guide rail 610 by a spring in order to provide an elastic force and a restoring force for moving or returning to a home position in a state that tension is applied or removed.

In the embodiment of fig. 21, the foot pedal 126 functions as the brake switching member 120, and further includes a gear assembly 70 connected by a cable between the foot pedal and the brake.

Referring to fig. 21, the gear assembly 70 may include: a first pivoting gear unit 710 connected for rotation with the control cable 118; a second shaft rotation gear unit 720 combined with the first shaft rotation gear unit to rotate toward the second shaft; and a brake control unit 730 connected to the brake cable 117, rotating in the first axial direction along the second axial rotation gear unit, and applying a pressure to the brake cable.

The first pivoting gear unit 710 may include: a cable connection part 711 formed at one end of the first shaft rotation gear unit 710 around the shaft, connected to the first control cable 118a and the second control cable 118b, and rotated in the first shaft direction by the first control cable and the second control cable; and a first gear part 712 formed at the other end of the first axis rotation gear unit 710, coupled to the second axis rotation gear unit, for transmitting a rotational force to the second axis rotation gear unit, and 2 first axis rotation gear units 710 connected to the respective foot pedals 126 may form a pair.

Also, the second shaft rotating gear unit 720 may include: a second gear part 721 coupled to the first gear part 712 to rotate in a second axial direction; and a rotation lever 722 that is integrally coupled to the second gear portion 721 and rotates in the second axial direction.

Here, 2 of the second axis-rotation gear units 720 may form a pair, as the first axis-rotation gears are the same, and as the pedal plates 126 are sequentially unfolded, 2 rotation rods 722 and 723 of the respective second axis-rotation gear units 720 are respectively operated, so that only in a case where all the pedal plates 126 are unfolded, pressure is applied to the brake control unit to rotate the brake control unit 730.

More specifically, the 2 control cables 118a, 118b associated with each foot pedal 126 have tension forces acting in opposition based on the folded state, where the tension force acts only on the first control cable 118a, and the unfolded state, where the tension force acts only on the second control cable 118 b.

That is, as shown in fig. 6, the first control cable 118a is stretched to a maximum length in the folded state to generate a pulling force for pulling the cable connection portion 711, and is stretched to a minimum length in the unfolded state to generate a pulling force for pulling the cable connection portion 711.

In the cable connecting portion 711, the vertical flanges are coupled to the first cable 118a and the second control cable 118b through the through holes, the first control cable 118a is coupled to the horizontal flange, and the second control cable 118b is coupled to the vertical flange.

Therefore, in a state where both the foot pedals are folded, the pulling tension acts only on the first control cable 118a, thereby maintaining the state as shown in part (a) of fig. 21.

In this case, if one foot pedal is deployed, a pulling tension is applied to only the second control cable 118b, and thus, as shown in fig. 21 (b), a pulling tension is generated in the vertical flange to which the second control cable 118b is coupled, thereby rotating the first pivoting gear unit 710 in the first axial direction.

As the first shaft rotation gear unit 710 rotates, the second shaft rotation gear unit rotates in the second shaft direction and moves the first rotation lever 722 in the second shaft direction by a distance corresponding to the displacement. The first rotating lever 722 applies pressure to the second rotating lever 723 during rotation, so that the second rotating lever 723 is rotated together with the first rotating lever 722 before the brake control unit 730 is applied with pressure.

In this state, the brake control unit 730 is in a state of not receiving any force, and thus the brake maintains the locked state.

Next, when the other pedal plate is deployed, the second rotating lever 723 of the other second shaft rotation gear unit is further rotated by the same operation to apply a pressure to the brake control unit 730, thereby rotating the brake control unit 730 in the first axis direction.

More specifically, the brake control unit 730 includes a brake guide bar 731 formed at a central axis and connected to the brake cable 117, and the second rotating lever 723 applies pressure to the brake guide bar 731 during rotation, whereby the central axis of the brake control unit 730 rotates in a first axial direction and tension pulling the brake cable 117 downward occurs, so that the direction of the tension acting in the brake direction is changed to the opposite direction and the brake cable is pulled in the opposite direction, thereby changing the brake from the locked state to the unlocked state.

Finally, the brake is only switched from the locked state to the unlocked state with 2 foot pedals all deployed.

In this state, if at least one of the foot pedals is folded, the brake guide bar 731 of the brake control unit returns to the home position and converts the tension direction of the brake cable into the brake direction by the opposite action, thereby converting the brake from the unlocked state to the locked state again.

The brake of the present invention may be in various forms, such as a brake plate-acting type as shown in fig. 10 (a), a caliper-acting type mainly applied to a stroller as shown in fig. 10 (b), a rim-braking type mainly applied to a bicycle as shown in fig. 10 (c), and a band-braking type as shown in fig. 10 (d).

Although the present invention has been described in detail with reference to the preferred embodiments thereof, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and various modifications and changes may be made without departing from the spirit and scope of the present invention.

Industrial applicability

The present invention relates to a wheelchair brake system, and more particularly, to a wheelchair brake system in which a brake is operated in a locked state at ordinary times such as when a rider gets up from a wheelchair, and the brake is automatically unlocked only when the rider sits on the wheelchair or folds the wheelchair, so that the wheelchair can be moved only when the rider sits on the wheelchair or folds the wheelchair, thereby preventing a possible accident of a fall when riding on or taking off the wheelchair.