阅读说明：本技术 一种可伸缩的翻折梯设备 (Telescopic ladder overturning equipment ) 是由 张伟 于 2020-06-24 设计创作，主要内容包括：一种可伸缩的翻折梯设备包括上梯体、下梯体、还包括设置在下梯体下端的伸缩装置、设置上梯体下端的连接装置、设置在上梯体上端的锁紧装置、固定连接在上梯体之间的多个梯杆,所述梯杆还固定连接在下体梯之间,所述梯杆以径向方向等间距分布在上梯体之间,所述梯杆以径向方向等间距分布在梯体之间。(The telescopic turnover ladder equipment comprises an upper ladder body, a lower ladder body, a telescopic device arranged at the lower end of the lower ladder body, a connecting device arranged at the lower end of the upper ladder body, a locking device arranged at the upper end of the upper ladder body, and a plurality of ladder rods fixedly connected between the upper ladder body and the lower ladder body, wherein the ladder rods are fixedly connected between the upper ladder body and the lower ladder body and are distributed between the upper ladder body and the lower ladder body at equal intervals in the radial direction, and the ladder rods are distributed between the ladder bodies at equal intervals in the radial direction.)

1. A telescopic folding ladder device comprises an upper ladder body 5 and a lower ladder body 6, and is characterized in that; the ladder comprises a lower ladder body 6, a telescopic device arranged at the lower end of the lower ladder body 6, a connecting device arranged at the lower end of the upper ladder body 5, a locking device arranged at the upper end of the upper ladder body 5, and a plurality of ladder rods 4 fixedly connected between the upper ladder body 5, wherein the ladder rods 4 are also fixedly connected between the lower ladder body 6, the ladder rods 4 are distributed between the upper ladder body 5 at equal intervals in the radial direction, and the ladder rods 5 are distributed between the ladder bodies 6 at equal intervals in the radial direction.

2. A collapsible ladder apparatus as claimed in claim 1, wherein: the telescopic device comprises a pressing through hole 22 arranged at the lower end of the lower ladder body 6, a pressing rod 21 capable of sliding in the pressing through hole in a reciprocating manner, a pressing block 13 fixedly connected to the pressing rod 21, a connecting inner cavity 23 arranged at the lower end of the lower ladder body 6, a plurality of step blocks 24 fixedly arranged on the side wall of the connecting inner cavity 23, an extension spring 28 fixedly connected to the top of the connecting inner cavity 23, a telescopic rod 25 fixedly connected to the lower end of the extension spring 28, and a plurality of step grooves 20 arranged on the side wall of the telescopic rod 25, a plurality of rail grooves 251 provided on the side wall of the telescopic rod 25, a sliding rail 27 capable of sliding in the rail grooves 251 in a reciprocating manner, a sliding plate 26 fixedly connected to the sliding rail 27, a fixed block 14 fixedly connected to the lower surface of the telescopic rod 25, a fixed groove 20 provided in the fixed block 14, a plurality of anti-slip blocks 29 fixedly provided in the fixed groove 20, and a plurality of anti-slip grooves 141 provided on the bottom surface of the fixed block 14.

3. A collapsible ladder apparatus as claimed in claim 2, wherein: press 13 and pass through spring coupling at the lateral wall of lower ladder body 6, ladder piece 24 is connecting the radial vertical equidistant distribution of inner chamber 23 lateral wall, extension spring 28 and telescopic link 25 fixed connection, ladder piece 24 and ladder groove 20 mutually support.

4. A collapsible ladder device as claimed in claim 1, wherein; the connecting device comprises a circular rotating groove 30 formed in the outer side wall of the upper end of the lower ladder body 6, a square rotating groove 32 formed in the side wall of the rotating shaft 10, a rotating groove 39 formed in the upper end of the lower ladder body 6, the rotating shaft 10 fixedly connected to the upper end of the lower ladder body 6, a limiting groove 31 formed in the lower end of the upper ladder body 5, a square limiting block 33 capable of sliding in the square rotating groove 32 in a reciprocating mode, a circular pushing block 12 fixedly connected to one end of the side wall of the square limiting block 33, a pushing disc 11 fixedly connected to the other end of the side wall of the circular pushing block 12, an upper connecting groove 34 formed in the lower end of the upper ladder body 5, a lower connecting groove 35 formed in the upper end of the lower ladder body 6, an upper connecting shaft 36 fixedly arranged in the upper connecting groove 34, a lower connecting shaft 37 fixedly connected to the.

5. A collapsible ladder device as claimed in claim 4, wherein; the diameter of the straight channel of the circular rotating groove 30 is the same as that of the inscribed circle of the square rotating groove 32, the center of the circular rotating groove 30 and the center of the square rotating groove 32 are on the same horizontal plane, the limiting groove 31 is opposite to the center of the square rotating groove 32, the side length of the limiting groove 31 is equal to that of the square rotating groove 32, the pressing disc 11 is connected to the side wall of the lower ladder body 6 through a spring, the circular pushing block 12 can slide in the circular rotating groove 30 and the limiting groove 31 in a reciprocating mode, the square limiting block 33 can slide in the limiting groove 31 and the square rotating groove 32 in a reciprocating mode, the connecting shaft 36 above the connecting plate 38 serves as a shaft to rotate, and the front end of the connecting plate 38 can be connected with the lower connecting groove 35 in a clamping.

6. A collapsible ladder device as claimed in claim 1, wherein; the locking device comprises a mounting groove 47 formed in the upper surface of the upper ladder body 5, a semicircular groove 46 formed in the bottom of the mounting groove 47, a locking block 45 fixedly arranged on the side wall of the bottom of the mounting groove 47, an arc groove 48 formed in the side wall of the locking block 45, a connecting rod 43 rotatably connected to the inside of the arc groove 48, a gear 44 fixedly connected to the connecting rod 43, a semicircular wheel 8 rotatably connected to the inside of the semicircular groove 46, a lighting lamp 7 fixedly arranged at the upper end of the upper ladder body 5, and a switch 15 fixedly arranged on the upper side wall of the upper ladder body 5.

7. A collapsible ladder device as claimed in claim 1, wherein; the semicircular wheel 8 is a three-quarter disc, the semicircular wheel 8 rotates in a semicircular groove 46, the gear 44 is meshed with teeth on the inner side of the semicircular wheel, the connecting rod 43 rotates in an arc groove 48, and the connecting rod 43 is fixedly connected to the side wall of the locking block 45.

Technical Field

The invention relates to the technical field of life, in particular to telescopic ladder turning equipment.

Background

People generally scrambles with the ladder among the daily life work to solve certain problem, like repair or change article, therefore the ladder becomes the instrument commonly used in the life work, therefore the application of ladder is more and more extensive, and the kind of current ladder has a lot, but when the people is using the ladder, because the people is in a take the altitude the sense of fear has appeared, this is because the steadiness of ladder is relatively poor, and the topography is changeable leads to standing ladder unstability, and present ladder is mostly single fixed state, is difficult to adapt to complicated topography, and current ladder is for the great working range of adaptation, and length is longer to be difficult to deposit moreover.

Disclosure of Invention

The invention aims to provide telescopic folding ladder equipment to solve the problems in the background technology.

The technical scheme of the invention is as follows: the telescopic turnover ladder equipment comprises an upper ladder body, a lower ladder body, a telescopic device arranged at the lower end of the lower ladder body, a connecting device arranged at the lower end of the upper ladder body, a locking device arranged at the upper end of the upper ladder body, and a plurality of ladder rods fixedly connected between the upper ladder body and the lower ladder body, wherein the ladder rods are fixedly connected between the upper ladder body and the lower ladder body and are distributed between the upper ladder body and the lower ladder body at equal intervals in the radial direction, and the ladder rods are distributed between the ladder bodies at equal intervals in the radial direction.

The telescopic device comprises a pressing through hole formed in the lower end of the lower ladder body, a pressing rod capable of sliding in the pressing through hole in a reciprocating mode, a pressing block fixedly connected to the pressing rod, a connecting inner cavity formed in the lower end of the lower ladder body, a plurality of step blocks fixedly arranged on the side wall of the connecting inner cavity, an extension spring fixedly connected to the top of the connecting inner cavity, a telescopic rod fixedly connected to the lower end of the extension spring, a plurality of step grooves formed in the side wall of the telescopic rod, a plurality of rail grooves formed in the side wall of the telescopic rod, a sliding rail capable of sliding in the rail grooves in a reciprocating mode, a sliding plate fixedly connected to the sliding rail, a fixed block fixedly connected to the lower surface of the telescopic rod, a fixed groove formed in the fixed block, a plurality of anti-slip blocks fixedly arranged in the fixed groove; press the lateral wall that the piece passes through spring coupling ladder body under, the ladder piece is connecting the radial vertical equidistant distribution of inner chamber lateral wall, extension spring and telescopic link fixed connection, the ladder piece is mutually supported with the ladder groove.

The connecting device comprises a circular rotating groove formed in the outer side wall of the upper end of the lower ladder body, a square rotating groove formed in the side wall of the rotating shaft, a rotating groove formed in the upper end of the lower ladder body, the rotating shaft fixedly connected to the upper end of the lower ladder body, a limiting groove formed in the lower end of the upper ladder body, a square limiting block capable of sliding in the square rotating groove in a reciprocating manner, a circular pushing block fixedly connected to one end of the side wall of the square limiting block, a pressing disc fixedly connected to the other end of the side wall of the circular pushing block, an upper connecting groove formed in the lower end of the upper ladder body, a lower connecting groove formed in the upper end of the lower ladder body, an upper connecting shaft fixedly arranged in the upper connecting groove, a lower connecting shaft; the diameter of the straight channel of the circular rotating groove is the same as that of the inscribed circle of the square rotating groove, the center of the circular rotating groove and the center of the square rotating groove are on the same horizontal plane, the limiting groove is opposite to the center of the square rotating groove, the side length of the limiting groove is equal to that of the square rotating groove, the pressing disc is connected to the side wall of the lower ladder body through a spring, the circular pushing block can slide in the circular rotating groove and the limiting groove in a reciprocating mode, the square limiting block can slide in the limiting groove and the square rotating groove in a reciprocating mode, the connecting shaft above the connecting plate rotates by taking the connecting shaft as a shaft, and the front end of the connecting plate can be connected with the lower connecting.

Locking device gets the mounting groove including offering at last ladder body upper surface, offers at the inside half slot of mounting groove bottom surface, the fixed tight locking piece that sets up at mounting groove bottom surface lateral wall, offers at the arc groove of the fast lateral wall of tight lock, rotates the connecting rod of connection at the arc inslot portion, the gear of fixed connection on the connecting rod, rotate the semicircle wheel of connection at the half slot, the fixed light that sets up on last ladder body, the fixed switch that sets up at last ladder body upper portion lateral wall the semicircle wheel is three-quarter's disc, the semicircle wheel rotates at the half slot, the gear meshes with semicircle wheel inboard tooth, the connecting rod rotates at the arc inslot, connecting rod fixed connection is on the lateral wall of latch segment.

In addition, the invention also provides a working method of the telescopic folding ladder equipment, which comprises the following steps:

1. firstly, when the folding ladder needs to be used, the folding ladder is firstly placed at a using place, a pressing block is pressed by hands, the pressing block drives a pressing rod to extrude a telescopic rod at a pressing through hole, the telescopic rod extrudes a sliding plate through a sliding rail, the sliding plate extrudes a spring, a step block is separated from a fixed groove, the telescopic rod moves upwards along the sliding rail to extrude an extension spring, after the step block is completely separated from the fixed groove, a rail groove on the telescopic rod moves downwards along the sliding rail under the action of the pressure of the spring and the gravity of the rail, so that the fixed block is contacted with the ground, the step block and the fixed groove are continuously matched with each other to complete fixing and limiting after the step block is contacted with the ground, the pressing block is extruded again after the use is finished, and the telescopic rod returns to; can make the telescopic link go on reciprocating sliding in vertical direction through the slip track, thereby it can work at the plane of different topography to make to turn over a ladder, and all be provided with the telescopic link on two terraced legs of lower terraced body, from can guaranteeing that ladder leg is not in on the same horizontal plane about, thereby accomplish the work of turning over a ladder, the ladder piece can guarantee the spacing of telescopic link with the cooperation in ladder groove, still stop to supply telescopic link supporting role when guaranteeing spacing, the antiskid groove that is located on the fixed block increases the frictional force of fixed block and ground, increase its safety in utilization of turning over a ladder, the non slipping spur can guarantee that the fixed block is fixed standing on the soft ground of soil texture, increase and turn over a ladder and work at different topography.

2. Secondly, after the use is finished, the pressing disc is pressed to drive the circular pushing block to enter the limiting groove from the circular sliding groove, meanwhile, the square limiting block is pushed to enter the square rotating groove, the square limiting block entering the square rotating groove forms limiting, the pushing and fixing action is kept, the connecting plate is simultaneously stirred to enable the connecting plate to rotate along the upper connecting shaft to be separated from the lower connecting shaft, then the upper ladder body is rotated to enable the limiting groove on the upper ladder body to rotate along the circumferential surface of the circular pushing block, so that the upper ladder body is contacted with the side wall of the lower ladder body, then loosen the press disc, circular promotion piece breaks away from the spacing inslot under the effect of spring, drives square stopper and enters into the spacing inslot from square rotation groove, and the square stopper left side that enters into the spacing inslot withstands the lateral wall of circular sliding tray to square stopper breaks away from and makes the completion spacing fixed to the last ladder body after the rotation.

3. Finally, when the ladder needs to be used for climbing among floors, the semicircular wheel of the turnover ladder is hung on the safety rod among the floors, the connecting rod is pulled by the upper shaving body under the action of gravity, the connecting rod rotates along the arc groove under the action of gravity, the rotating connecting rod drives the gear to rotate, the gear in the rotating process is meshed with the teeth on the semicircular wheel to drive the semicircular groove of the semicircular wheel to do rotating motion, so that the front end of the semicircular wheel enters the semicircular groove to form a closed locking state, the operation safety of the turnover ladder is ensured, the safety guarantee capability of users is improved, the front end of the semicircular wheel which rotates into the semicircular groove is placed in a plane in the normal use process, the ground gripping capability of the front end of the semicircular wheel is improved under the action of gravity during working use, the stability of the turnover ladder is improved, and the harm to the users caused by the sliding of the front end of the turnover ladder is prevented, the illuminating lamp can be turned on through the switch when the LED lamp is used at night to illuminate, so that a user does not need to carry the LED lamp, and the working intensity of the user is reduced.

Advantageous effects

The invention provides a telescopic folding ladder device through improvement, compared with the prior art, the telescopic folding ladder device has the following improvement and advantages:

1. shave body 5 pulling connecting rod 43 in the effect through gravity, connecting rod 43 rotates along circular arc groove 48 under the effect of gravity, pivoted connecting rod 43 drives gear 44 and rotates, gear 44 in the rotatory process through with the tooth engagement on the semicircle wheel 8, drive semicircle wheel 8 semicircle trough 46 and be rotary motion, thereby make the front end of semicircle wheel 8 enter into the semicircle trough 46, form confined locking state, guarantee the operation security of the ladder of turning over, increase user of service's safety guarantee ability.

2. The semicircular wheel that the rotation entered into in the semicircular groove 46 places in the plane at its front end in normal use, and the action of gravity when using through work can make its front end increase grab ground ability, has increased the stability of turning over a ladder, prevents that its front end from slideing and causes harm to the user of service, can open the light through switch 15 when using night, throws light on, need not the user of service and carries, reduces user of service's working strength.

Drawings

The invention is further explained below with reference to the figures and examples:

fig. 1 is a structural view of the present invention.

Fig. 2 is a top view of the present invention.

Fig. 3 is a cross-sectional view taken at D-D in fig. 2.

Fig. 4 is an enlarged view at Q in fig. 3.

Fig. 5 is an enlarged view of W in fig. 3.

Fig. 6 is a cross-sectional view at F-F in fig. 3.

Fig. 7 is an enlarged view at E in fig. 6.

Fig. 8 is a perspective view, cut away at a-a in fig. 2.

Fig. 9 is an enlarged view at R in fig. 8.

Fig. 10 is a perspective view of fig. 2 taken in section at S-S.

Fig. 11 is an enlarged view at Y in fig. 10.

Fig. 12 is an enlarged view at P in fig. 10.

Fig. 13 is a perspective view of the cross-section at K-K in fig. 2.

Fig. 14 is an enlarged view of fig. 13 at U.

Detailed Description

The present invention will be described in detail with reference to fig. 1 to 14, and the technical solutions in the embodiments of the present invention will be clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention relates to telescopic turnover ladder equipment which comprises an upper ladder body 5, a lower ladder body 6, a telescopic device arranged at the lower end of the lower ladder body 6, a connecting device arranged at the lower end of the upper ladder body 5, a locking device arranged at the upper end of the upper ladder body 5, and a plurality of ladder rods 4 fixedly connected between the upper ladder body 5, wherein the ladder rods 4 are also fixedly connected between the lower ladder body 6, the ladder rods 4 are distributed between the upper ladder body 5 at equal intervals in the radial direction, and the ladder rods 5 are distributed between the ladder bodies 6 at equal intervals in the radial direction.

The telescopic device comprises a pressing through hole 22 arranged at the lower end of the lower ladder body 6, a pressing rod 21 capable of sliding in the pressing through hole in a reciprocating manner, a pressing block 13 fixedly connected to the pressing rod 21, a connecting inner cavity 23 arranged at the lower end of the lower ladder body 6, a plurality of step blocks 24 fixedly arranged on the side wall of the connecting inner cavity 23, an extension spring 28 fixedly connected to the top of the connecting inner cavity 23, a telescopic rod 25 fixedly connected to the lower end of the extension spring 28, and a plurality of step grooves 20 arranged on the side wall of the telescopic rod 25, a plurality of rail grooves 251 arranged on the side wall of the telescopic rod 25, a sliding rail 27 capable of sliding in the rail grooves 251 in a reciprocating manner, a sliding plate 26 fixedly connected to the sliding rail 27, a fixed block 14 fixedly connected to the lower surface of the telescopic rod 25, a fixed groove 20 arranged in the fixed block 14, a plurality of anti-skidding blocks 29 fixedly arranged in the fixed groove 20, and a plurality of anti-skidding grooves 141 arranged on the bottom surface of the fixed block 14; press 13 and pass through spring coupling at the lateral wall of lower ladder body 6, ladder piece 24 is connecting the radial vertical equidistant distribution of inner chamber 23 lateral wall, extension spring 28 and telescopic link 25 fixed connection, ladder piece 24 and ladder groove 20 mutually support. When the folding ladder needs to be used, the folding ladder is firstly placed at a using place, the pressing block 13 is pressed by hands, the pressing block 13 drives the pressing rod 21 to extrude the telescopic rod 25 at the pressing through hole 22, the telescopic rod 25 extrudes the sliding plate 26 through the sliding rail 27, the sliding plate 26 extrudes the spring, the step block 24 is separated from the fixed groove 20, the telescopic rod 25 moves upwards along the sliding rail 27 to extrude the extension spring 28, after the step block 24 is completely separated from the fixed groove 20, the rail groove 251 in the telescopic rod 25 moves downwards along the sliding rail 27 under the action of the pressure of the spring and the gravity of the telescopic rod, so that the fixed block 14 is contacted with the ground, the step block 24 and the fixed groove 20 are continuously matched with each other to complete fixing and limiting after the step block 24 is contacted with the ground, the pressing block 13 is extruded again after the use is finished, and the telescopic rod 25 returns; can make telescopic link 25 go on reciprocating sliding in vertical direction through slip track 27, thereby make to turn over a ladder and can work at the plane of different topography, and all be provided with telescopic link 25 on two terraced legs of lower corpus 6, from can guaranteeing that the terraced leg is not in on same horizontal plane about, thereby accomplish the work of turning over a ladder, the cooperation of ladder piece 24 and ladder groove 20 can guarantee telescopic link 25 spacing, still stop to supply telescopic link 25 supporting role when guaranteeing spacingly, anti-skidding groove 141 that is located on fixed block 14 increases the frictional force of fixed block 14 and ground, increase its safety in utilization that turns over a ladder, non-slipping spur 29 can guarantee that fixed block 14 is fixed standing on the soft ground of soil texture, increase and turn over a ladder in the topographic work of difference.

The connecting device comprises a circular rotating groove 30 formed in the outer side wall of the upper end of the lower ladder body 6, a square rotating groove 32 formed in the side wall of the rotating shaft 10, a rotating groove 39 formed in the upper end of the lower ladder body 6, the rotating shaft 10 fixedly connected to the upper end of the lower ladder body 6, a limiting groove 31 formed in the lower end of the upper ladder body 5, a square limiting block 33 capable of sliding in the square rotating groove 32 in a reciprocating mode, a circular pushing block 12 fixedly connected to one end of the side wall of the square limiting block 33, a pushing disc 11 fixedly connected to the other end of the side wall of the circular pushing block 12, an upper connecting groove 34 formed in the lower end of the upper ladder body 5, a lower connecting groove 35 formed in the upper end of the lower ladder body 6, an upper connecting shaft 36 fixedly arranged in the upper connecting groove 34, a lower connecting shaft 37 fixedly connected in the; the diameter of the straight channel of the circular rotating groove 30 is the same as that of the inscribed circle of the square rotating groove 32, the center of the circular rotating groove 30 and the center of the square rotating groove 32 are on the same horizontal plane, the limiting groove 31 is opposite to the center of the square rotating groove 32, the side length of the limiting groove 31 is equal to that of the square rotating groove 32, the pressing disc 11 is connected to the side wall of the lower ladder body 6 through a spring, the circular pushing block 12 can slide in the circular rotating groove 30 and the limiting groove 31 in a reciprocating mode, the square limiting block 33 can slide in the limiting groove 31 and the square rotating groove 32 in a reciprocating mode, the connecting shaft 36 above the connecting plate 38 serves as a shaft to rotate, and the front end of the connecting plate 38 can be connected with the lower connecting groove 35 in a clamping. After the use is finished, the pressing disc 11 is pressed, the pressing disc 11 drives the circular pushing block 12 to enter the limiting groove 31 from the circular sliding groove 30, meanwhile, the square limiting block 33 is pushed to enter the square rotating groove 32, the square limiting block entering the square rotating groove 32 forms limiting, the fixing effect of the pushing block 12 is kept, the connecting plate 38 is pushed to enter, the connecting plate 38 is rotated to be separated from the lower connecting shaft 37 along the upper connecting shaft 36, then the upper ladder body 5 is rotated, the limiting groove 31 on the upper ladder body 5 is rotated along the circumferential surface of the circular pushing block 12, the upper ladder body 5 is contacted with the side wall of the lower ladder body 6, then the pressing disc 11 is loosened, the circular pushing block 12 is separated from the limiting groove 31 under the action of the spring, the square limiting block 33 is driven to enter the limiting groove 31 from the square rotating groove 32, the left side of the square limiting block 33 entering the limiting groove 31 abuts against the side wall of the circular sliding groove 30, thereby the square limited block 33 is separated and the limited fixation of the rotated ascending ladder body 5 is completed.

The locking device comprises a mounting groove 47 formed in the upper surface of the upper ladder body 5, a semicircular groove 46 formed in the bottom surface of the mounting groove 47, a locking block 45 fixedly arranged on the side wall of the bottom surface of the mounting groove 47, an arc groove 48 formed in the side wall of the locking block 45, a connecting rod 43 rotatably connected in the arc groove 48, a gear 44 fixedly connected to the connecting rod 43, a semicircular wheel 8 rotatably connected in the semicircular groove 46, an illuminating lamp 7 fixedly arranged at the upper end of the upper ladder body 5, and a switch 15 fixedly arranged on the upper side wall of the upper ladder body 5; the semicircular wheel 8 is a three-quarter disc, the semicircular wheel 8 rotates in a semicircular groove 46, the gear 44 is meshed with teeth on the inner side of the semicircular wheel, the connecting rod 43 rotates in an arc groove 48, and the connecting rod 43 is fixedly connected to the side wall of the locking block 45; when the ladder needs to climb between floors for use, the semicircular wheel 8 of the turnover ladder is hung on the safety rod between the floors, the shaving body 5 pulls the connecting rod 43 under the action of gravity, the connecting rod 43 rotates along the arc groove 48 under the action of gravity, the rotating connecting rod 43 drives the gear 44 to rotate, the gear 44 in the rotating process is meshed with the teeth on the semicircular wheel 8 to drive the semicircular groove 46 of the semicircular wheel 8 to rotate, so that the front end of the semicircular wheel 8 enters the semicircular groove 46 to form a closed locking state, the operation safety of the turnover ladder is ensured, the safety guarantee capability of users is improved, the front end of the semicircular wheel which rotates into the semicircular groove 46 is placed in a plane in the normal use process, the front end of the semicircular wheel can increase the gripping force under the action of gravity during working use, the stability of the turnover ladder is improved, and the damage of the front sliding end of the turnover ladder to the users is prevented, can open the light through switch 15 when using night, throw light on, need not the user and carry, reduce user of service's working strength.

The working principle is as follows:

1. firstly, when the folding ladder needs to be used, the folding ladder is firstly placed at a using place, the pressing block 13 is pressed by hands, the pressing block 13 drives the pressing rod 21 to extrude the telescopic rod 25 at the pressing through hole 22, the telescopic rod 25 extrudes the sliding plate 26 through the sliding rail 27, the sliding plate 26 extrudes the spring, the step block 24 is separated from the fixed groove 20, the telescopic rod 25 moves upwards along the sliding rail 27 to extrude the extension spring 28, after the step block 24 is completely separated from the fixed groove 20, the rail groove 251 on the telescopic rod 25 moves downwards along the sliding rail 27 under the action of the pressure of the spring and the gravity of the rail groove 251, so that the fixed block 14 is in contact with the ground, the step block 24 and the fixed groove 20 are continuously matched with each other to complete fixing and limiting after the fixed block is in contact with the ground, the pressing block 13 is extruded again after the use is finished, and the telescopic rod; can make telescopic link 25 go on reciprocating sliding in vertical direction through slip track 27, thereby make to turn over a ladder and can work at the plane of different topography, and all be provided with telescopic link 25 on two terraced legs of lower corpus 6, from can guaranteeing that the terraced leg is not in on same horizontal plane about, thereby accomplish the work of turning over a ladder, the cooperation of ladder piece 24 and ladder groove 20 can guarantee telescopic link 25 spacing, still stop to supply telescopic link 25 supporting role when guaranteeing spacingly, anti-skidding groove 141 that is located on fixed block 14 increases the frictional force of fixed block 14 and ground, increase its safety in utilization that turns over a ladder, non-slipping spur 29 can guarantee that fixed block 14 is fixed standing on the soft ground of soil texture, increase and turn over a ladder in the topographic work of difference.

2. Secondly, after the use is finished, the pressing disc 11 is pressed, the pressing disc 11 drives the circular pushing block 12 to enter the limiting groove 31 from the circular sliding groove 30, meanwhile, the square limiting block 33 is pushed to enter the square rotating groove 32, the square limiting block entering the square rotating groove 32 forms limiting, the fixing effect of the pushing block 12 is kept, the connecting plate 38 is pushed to enter, the connecting plate 38 is rotated to be separated from the lower connecting shaft 37 along the upper connecting shaft 36, then the upper ladder body 5 is rotated, the limiting groove 31 on the upper ladder body 5 is rotated along the circumferential surface of the circular pushing block 12, the upper ladder body 5 is contacted with the side wall of the lower ladder body 6, then the pressing disc 11 is loosened, the circular pushing block 12 is separated from the limiting groove 31 under the action of the spring, the square limiting block 33 is driven to enter the limiting groove 31 from the square rotating groove 32, the left side of the square limiting block 33 entering the limiting groove 31 abuts against the side wall of the circular sliding groove 30, thereby the square limited block 33 is separated and the limited fixation of the rotated ascending ladder body 5 is completed.

3. Finally, when the ladder needs to be used for climbing among floors, the semicircular wheel 8 of the folding ladder is hung on the safety rod among the floors, the connecting rod 43 is pulled by the upper shaving body 5 under the action of gravity, the connecting rod 43 rotates along the arc groove 48 under the action of gravity, the rotating connecting rod 43 drives the gear 44 to rotate, the gear 44 in the rotating process is meshed with the teeth on the semicircular wheel 8 to drive the semicircular groove 46 of the semicircular wheel 8 to do rotating motion, so that the front end of the semicircular wheel 8 enters the semicircular groove 46 to form a closed locking state, the operation safety of the folding ladder is ensured, the safety guarantee capability of users is improved, the front end of the semicircular wheel which rotates into the semicircular groove 46 is placed in a plane in the normal use process, the front end of the semicircular wheel can increase the ground gripping capability under the action of gravity during working use, and the folding stability of the ladder is improved, prevent that its front end from slideing and cause harm to the user of service, can open the light through switch 15 when using night, throw light on, need not the user of service and carry, reduce user of service's working strength.