阅读说明：本技术 一种多功能轮椅头枕 (Multifunctional wheelchair headrest ) 是由 黎臻 奉明军 于 2020-06-05 设计创作，主要内容包括：本发明提出一种多功能轮椅头枕,包括主体架、固定组件、旋转座和头靠组件；固定组件用于连接并固定在轮椅主体上,其设置有两组；两组所述固定组件分别活动插装在主体架的左右两侧上,且可沿主体架的左右方向伸缩；旋转座包括插装部和连接部,所述插装部一端活动地插装在主体架上,且能够相对主体架沿其插入方向滑动；所述连接部的一端与插装部的另一端铰接,所述连接部能够围绕与插装部所构成的铰接点沿主体架的前后方向摆动；头靠组件活动插装在连接部的另一端上。本轮椅头枕能够匹配市场不同高度和宽度的轮椅,且调节方便,使用灵活。(The invention provides a multifunctional wheelchair headrest which comprises a main body frame, a fixing assembly, a rotating seat and a headrest assembly, wherein the main body frame is provided with a support frame; the fixing components are used for connecting and fixing the wheelchair main body and are provided with two groups; the two groups of fixed components are respectively movably inserted on the left side and the right side of the main body frame and can stretch along the left-right direction of the main body frame; the rotating seat comprises an inserting part and a connecting part, wherein one end of the inserting part is movably inserted on the main body frame and can slide along the inserting direction relative to the main body frame; one end of the connecting part is hinged with the other end of the inserting part, and the connecting part can swing around a hinged point formed by the connecting part and the inserting part along the front-back direction of the main body frame; the headrest assembly is movably inserted on the other end of the connecting part. The wheelchair headrest can be matched with wheelchairs with different heights and widths in the market, is convenient to adjust and is flexible to use.)

1. A multifunctional wheelchair headrest is characterized by comprising

A main body frame;

the fixing components are used for connecting and fixing the wheelchair main body and are provided with two groups; the two groups of fixed components are respectively movably inserted on the left side and the right side of the main body frame and can stretch along the left-right direction of the main body frame;

a rotating base; the plug-in part comprises a plug-in part and a connecting part, wherein one end of the plug-in part is movably plugged in the main body frame and can slide along the plug-in direction of the main body frame; one end of the connecting part is hinged with the other end of the inserting part, and the connecting part can swing around a hinged point formed by the connecting part and the inserting part along the front-back direction of the main body frame; and

the headrest assembly is movably inserted on the other end of the connecting part.

2. The multifunctional wheelchair headrest of claim 1, wherein the rotary seat further comprises an adjusting shaft, the insertion portion and the connecting portion are rotatably mounted on corresponding ends of the adjusting shaft, and the adjusting shaft is capable of locking a swing angle between the insertion portion and the connecting portion.

3. The multifunctional wheelchair headrest of claim 2, wherein the adjusting rotating shaft comprises a left rotating sleeve, a right rotating sleeve, a locking assembly and a button, one end of the inserting part is connected with the right rotating sleeve, and one end of the connecting part is connected with the right rotating sleeve; the two ends of the locking assembly are respectively inserted into the left rotating sleeve and the right rotating sleeve, the left rotating sleeve and the right rotating sleeve can rotate relatively on the locking assembly, the button is mounted on the right rotating sleeve, and the output end of the button can drive the locking assembly to be unlocked so as to realize the rotation of the left rotating sleeve relative to the right rotating sleeve.

4. The multifunctional wheelchair headrest of claim 3, wherein the locking assembly comprises a spring, a gear and a retaining flange, the gear is coaxially inserted into the left-turn sleeve, and the gear can only slide in the left-turn sleeve along the axial direction of the left-turn sleeve; the spring is arranged in the left rotating sleeve, and two ends of the spring are respectively connected with the bottom of the left rotating sleeve and the side surface of the gear; the clamping flange is clamped in one end, close to the left rotating sleeve, of the right rotating sleeve, and the spring can press the gear to be abutted with the clamping flange in a fit manner; a locking bolt is inserted into the left-turn sleeve, one end of the locking bolt sequentially and movably penetrates through the spring, the gear and the clamping flange, and the left-turn sleeve and the right-turn sleeve are locked through a locking nut; the button is movably inserted into the other end of the right rotating sleeve, one end of the button extends out of the right rotating sleeve, the other end of the button movably penetrates through the clamping flange, and the pressing gear can be jacked to slide in the left rotating sleeve to separate the driving gear from the clamping flange.

5. The multifunctional wheelchair headrest of claim 4, wherein the side of the gear adjacent to the retaining flange is provided with ratchet teeth, and the retaining flange is provided with ratchet grooves for matching with the ratchet teeth.

6. The multifunctional wheelchair headrest of claim 4, wherein the retaining flange is provided with a plurality of through holes, the button is provided with a plurality of top pressing tongues matching with the through holes, and the top pressing tongues movably penetrate through the through holes and can be abutted against the side faces of the gears.

7. The multifunctional wheelchair headrest of claim 4, wherein the inner wall of the left-turn sleeve is provided with a tooth socket for matching teeth on the gear.

8. The multifunctional wheelchair headrest of claim 4, wherein the retaining flange is mounted in the right turn sleeve by interference fit or screw fixation.

9. The multifunctional wheelchair headrest of any one of claims 1 to 8, wherein the main body frame comprises vertical cylinders and transverse cylinders, the vertical cylinders and the transverse cylinders are distributed in a cross shape, the insertion part is movably inserted into the vertical cylinders, the vertical cylinders are provided with adjusting snapping buckles, and the adjusting snapping buckles lock the insertion part in the vertical cylinders in a mode of pressing the pressing block to penetrate through the vertical cylinders; the two groups of fixing assemblies are respectively movably inserted at two ends of the transverse cylinder, and the two ends of the transverse cylinder are also provided with the adjusting snap buttons for locking the fixing assemblies.

10. The multifunctional wheelchair headrest of claim 9, wherein the fixing assembly comprises an L-shaped tube, a fixing body and a hinge, one side of the hinge is hinged to the fixing body, one end of the L-shaped tube is movably inserted into one end of the cross tube, the fixing body is movably sleeved on the other end of the L-shaped tube, and the fixing body is also locked on the L-shaped tube by adjusting a pressing block which is pressed by a buckle; the outward swinging end of the hinge is fixed on the fixing main body through a screw, and a clamping space for clamping the wheelchair hand push pipe is formed between the outward swinging end of the hinge and the fixing main body.

Technical Field

The invention relates to the technical field of wheelchair accessories, in particular to a wheelchair headrest.

Background

The wheelchair is an important tool for rehabilitation of patients with injured legs, and is also a tool for walking instead of walking for people with limb injuries and mobility difficulties. The common wheelchair generally comprises a wheelchair frame, wheels, a brake device and a seat back. However, most of the existing wheelchair frames are fixed in size, and the wheelchair frames mainly consider that different users need wheelchairs with different sizes and specifications. Because the wheelchair frame of same size specification all generally matches the crowd of certain size scope, to the great patient of size, the wheelchair frame can't provide to lean on to partial back and the head of patient and put, especially some impaired patients of neck vertebra, if the wheelchair can't I patient's neck and head provide one and fix the dependence, then make the patient recovered slowly. In addition, some manufacturers generally improve the backrest tube of the wheelchair frame to increase the applicable range of the wheelchair, for example, CN201721211871.3 patent provides a wheelchair heightening backrest that solves the problem of the mismatch between the size of the wheelchair and the size of the patient by adopting a heightening backrest, but in this patent, the height of the supporting frame and the height of the backrest cushion are relatively fixed, which is also achieved by simply adding a structure to extend the size of the wheelchair backrest. But the position of the headrest on the backrest cushion is relatively fixed, so that the flexibility, adjustability and firmness of the headrest in the patent are obviously relatively single, the adjustment in the front-back, left-right and up-down directions cannot be simultaneously met, different requirements of different wounded people cannot be met, even different vehicle types cannot be matched, and the applicability is low.

Disclosure of Invention

In order to solve the problems, the invention provides a wheelchair headrest which can be matched with wheelchairs with different heights and widths in the market, is convenient to adjust and is flexible to use.

The invention is realized by the following technical scheme:

the invention provides a multifunctional wheelchair headrest which comprises a main body frame, a fixing assembly, a rotating seat and a headrest assembly, wherein the main body frame is provided with a support frame; the fixing components are used for connecting and fixing the wheelchair main body and are provided with two groups; the two groups of fixed components are respectively movably inserted on the left side and the right side of the main body frame and can stretch along the left-right direction of the main body frame; the rotating seat comprises an inserting part and a connecting part, wherein one end of the inserting part is movably inserted on the main body frame and can slide along the inserting direction relative to the main body frame; one end of the connecting part is hinged with the other end of the inserting part, and the connecting part can swing around a hinged point formed by the connecting part and the inserting part along the front-back direction of the main body frame; the headrest assembly is movably inserted on the other end of the connecting part.

Furthermore, the rotating seat further comprises an adjusting rotating shaft, the inserting portion and the connecting portion are respectively and rotatably installed at one corresponding end of the adjusting rotating shaft, and the adjusting rotating shaft can lock a swing included angle between the inserting portion and the connecting portion.

Furthermore, the adjusting rotating shaft comprises a left rotating sleeve, a right rotating sleeve, a locking assembly and a button, one end of the inserting part is connected with the right rotating sleeve, and one end of the connecting part is connected with the right rotating sleeve; the two ends of the locking assembly are respectively inserted into the left rotating sleeve and the right rotating sleeve, the left rotating sleeve and the right rotating sleeve can rotate relatively on the locking assembly, the button is mounted on the right rotating sleeve, and the output end of the button can drive the locking assembly to be unlocked so as to realize the rotation of the left rotating sleeve relative to the right rotating sleeve.

Furthermore, the locking assembly comprises a spring, a gear and a clamping flange, the gear is coaxially inserted into the left rotating sleeve, and the gear can only slide in the left rotating sleeve along the axial direction of the left rotating sleeve; the spring is arranged in the left rotating sleeve, and two ends of the spring are respectively connected with the bottom of the left rotating sleeve and the side surface of the gear; the clamping flange is clamped in one end, close to the left rotating sleeve, of the right rotating sleeve, and the spring can press the gear to be abutted with the clamping flange in a fit manner; a locking bolt is inserted into the left-turn sleeve, one end of the locking bolt sequentially and movably penetrates through the spring, the gear and the clamping flange, and the left-turn sleeve and the right-turn sleeve are locked through a locking nut; the button is movably inserted into the other end of the right rotating sleeve, one end of the button extends out of the right rotating sleeve, the other end of the button movably penetrates through the clamping flange, and the pressing gear can be jacked to slide in the left rotating sleeve to separate the driving gear from the clamping flange.

Furthermore, the side face, close to the clamping flange, of the gear is provided with a ratchet, and the clamping flange is provided with a ratchet groove matched with the ratchet.

Furthermore, be provided with a plurality of perforation on the screens flange, be provided with a plurality of perforation's of matching top pressure tongue on the button, top pressure tongue activity passes the perforation, and can with gear side butt.

Furthermore, a tooth socket matched with teeth on the gear is arranged on the inner wall of the left rotating sleeve.

Furthermore, the screens flange is installed in the right turn cover through interference fit or screw fixation mode.

Furthermore, the main body frame comprises a vertical cylinder and a horizontal cylinder, the vertical cylinder and the horizontal cylinder are distributed in a cross shape, the inserting part is movably inserted into the vertical cylinder, the vertical cylinder is provided with an adjusting snapping buckle, and the adjusting snapping buckle locks the inserting part in the vertical cylinder in a mode that a top pressing block penetrates through the vertical cylinder; the two groups of fixing assemblies are respectively movably inserted at two ends of the transverse cylinder, and the two ends of the transverse cylinder are also provided with the adjusting snap buttons for locking the fixing assemblies.

Furthermore, the fixing assembly comprises an L-shaped pipe, a fixing main body and a hinge, one side of the hinge is hinged to the fixing main body, one end of the L-shaped pipe is movably inserted into one end of the transverse cylinder, the fixing main body is movably sleeved on the other end of the L-shaped pipe, and the fixing main body is locked on the L-shaped pipe in a manner of adjusting the snapping and pressing block; the outward swinging end of the hinge is fixed on the fixing main body through a screw, and a clamping space for clamping the wheelchair hand push pipe is formed between the outward swinging end of the hinge and the fixing main body.

The invention has the beneficial effects that:

the invention provides a multifunctional wheelchair headrest, which is characterized in that a fixing component is arranged on a main body frame, so that the whole headrest can adapt to wheelchairs with different widths; utilize the roating seat except can realizing the regulation of height, can also be through the relative swing of cartridge portion and connecting portion in order to realize the back and forth swing of headrest subassembly, adapt to different disease crowds' use, the flexibility of whole headrest is strong, convenient to use. In addition, still the design has the regulation pivot in this application, comes the relative swing of locking cartridge portion and connecting portion through adjusting the pivot, and then can fix the swing angle of head rest subassembly, and then realizes the position locking, improves patient's comfort level. And the regulation locking mode of adjusting the rotating shaft is convenient and reliable, can be randomly locked according to the requirements of patients, and has wide application range. In addition, through the concrete structure of the fixed subassembly of design, adopt to adjust to break off with the fingers and thumb the mode of locking and fix the locking for whole headrest easy dismounting.

Drawings

FIG. 1 is a first schematic structural diagram according to an embodiment of the present invention;

FIG. 2 is a second schematic structural diagram according to an embodiment of the present invention;

FIG. 3 is an exploded view of an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a fixing assembly according to an embodiment of the present invention;

FIG. 5 is a schematic view of a rotary base according to an embodiment of the present invention;

FIG. 6 is a cross-sectional view of an adjustment spindle in an embodiment of the present invention;

fig. 7 is a schematic view of a part of the structure of the adjusting rotating shaft in the embodiment of the invention.

Detailed Description

In order to more clearly and completely explain the technical scheme of the invention, the invention is further explained with reference to the attached drawings.

For convenience of explanation, the directional terms referred to in the specification and claims of the present invention correspond to the position of the wheelchair headrest particularly mounted on the wheelchair. For example: when the front part of the wheelchair corresponds to a patient sitting on the wheelchair, the side of the wheelchair facing the patient is correspondingly the rear part of the wheelchair corresponding to the patient sitting on the wheelchair, and the side facing back is the rear part; the left side and the right side of the wheelchair respectively correspond to the left side and the right side of the body of a patient when the patient sits on the wheelchair.

Referring to fig. 1 to 7, the present invention provides a multifunctional wheelchair headrest, which includes a main body frame 1, a fixing assembly 2, a rotating seat 3 and a headrest assembly 4; the fixed components 2 are used for being connected and fixed on the wheelchair main body and are provided with two groups; the two groups of fixed components 2 are respectively movably inserted on the left side and the right side of the main body frame 1 and can stretch along the left-right direction of the main body frame 1; the rotating seat 3 comprises an insertion part 31 and a connecting part 32, wherein one end of the insertion part 31 is movably inserted on the main body frame 1 and can slide along the insertion direction of the main body frame 1; one end of the connecting part 32 is hinged with the other end of the inserting part 31, and the connecting part 32 can swing around a hinged point formed by the connecting part and the inserting part 31 along the front and back directions of the main body frame 1; the headrest assembly 4 is movably inserted into the other end of the connecting portion 32. It should be noted that, in this application, two sets of the fixing assemblies 2 can be extended and retracted outwards, and are not actually self-extended and retracted, but the fixing assemblies 2 are pulled out outwards relative to the main body frame 1, so as to achieve the effect of extension and retraction.

The whole headrest can adapt to wheelchairs with different widths by arranging the fixing component 2 on the main body frame 1; utilize roating seat 3 except can realizing the regulation of height, can also be through the relative swing of cartridge portion 31 and connecting portion 32 in order to realize the back and forth swing of headrest subassembly 4, adapt to different disease crowds' use, the flexibility of whole headrest is strong, convenient to use.

Referring to fig. 1 to 3, the main body frame 1 is used as an important basic structure for fixing the whole headrest, and in the present application, an accommodating space for accommodating two sets of the fixing assemblies 2 and the inserting portion 31 is provided in the main body frame 1, so that the main body frame 1 can adopt a tubular structure design in actual use, which facilitates the installation of the two sets of the fixing assemblies 2 and the inserting portion 31; and also facilitates the relative position adjustment of the fixed component 2 and the insertion part 31 relative to the main body frame 1. In one embodiment of the present application, the body frame 1 includes a vertical cylinder 11 and a horizontal cylinder 12, the vertical cylinder 11 and the horizontal cylinder 12 are distributed in a cross shape, the inserting portion 31 is movably inserted into the vertical cylinder 11, the vertical cylinder 11 is provided with an adjusting snapping buckle 5, and the adjusting snapping buckle 5 locks the inserting portion 31 in the vertical cylinder 11 by pressing the pressing block 6 to penetrate through the vertical cylinder 11; the two groups of fixing components 2 are respectively movably inserted at two ends of a transverse cylinder 12, and the two ends of the transverse cylinder 12 are also provided with the adjusting snap-buckles 5 for locking the fixing components 2. It should be noted that a top pressure hole 8 is provided on the top end of the vertical cylinder 11 and on the side of the rear surface of the entire headrest on both ends of the horizontal cylinder 12, and the pressing block 6 is fitted in the top pressure hole 8, and the pressing block 6 can move along the axial direction of the top pressure hole 8. Based on the motion characteristic of briquetting 6, this application design is adjusted to break off with the fingers and thumb 5 and come the cooperation briquetting 6 to use, adjust to break off with the fingers and thumb 5 and be conventional structural design, can refer to patent CN 201020156989.2-the concrete structure of quick detach lever group in the bicycle jiffy stand, in above-mentioned comparison document, the locking function of quick detach lever group relies on the rotation end of pull rod to stimulate the screw rod, the rotation end of pull rod is eccentric rotation, utilize its eccentric structure to make pull rod pivoted center of rotation relatively with the fixed ring main part of tube bank apart from discovering the change, and then come the portion of supporting of opposite side through the screw rod. In the present application, the adjusting snap 5 is not connected with a screw, but is pressed against the pressing block 6 to tightly press the components to be fixed in the vertical cylinder 11 and the horizontal cylinder 12. In the application, the rotating end of the adjusting snap 5 is also eccentrically arranged relative to the main body where the adjusting snap 5 is installed, so that when the adjusting snap 5 rotates around the rotating center, the eccentric rotating end on the adjusting snap 5 can provide pressing strokes with different eccentric distances. The adjusting snap 5 and the press block 6 in the above mentioned documents and the present application are conventional and conventional structures, and the principles of the two are the same, so the present application does not describe the specific principles and structures thereof in detail here. This application has just utilized the regulation to break off with the fingers and thumb and has buckled 5 characteristics that can roof pressure or release briquetting 6 fast and realize the fixed action, consequently this application has also only protected and has adopted the regulation to break off with the fingers and thumb and detain 5 cooperation briquetting 6 and realize the technical scheme that locks fast or unclamp in the wheelchair field.

Wherein, can adopt the welded mode to carry out reciprocal anchorage between the vertical cylinder 11 and the horizontal cylinder 12 in fact, keep both perpendicular simultaneously, later stage installation like this, horizontal cylinder 12 just in time is parallel with the top of wheelchair back, and it can be balanced to rely on the both sides back of disease to a certain extent. Of course, in practical use, a backrest structure can be fixed on the transverse cylinder 12, and the backrest can be made of a plurality of modules, so that the use comfort is improved. Further, for comfort, the vertical tube 11 is installed at the rear side of the horizontal tube 12, i.e. the side far away from the patient, so that the actual use space can be made free, and the structure of the vertical tube 11 is prevented from influencing the use comfort. In the preferred embodiment of the present application, in order to avoid the rotation of the inserting portion 31 relative to the vertical cylinder 11 and the rotation of the fixing component 2 relative to the horizontal cylinder 12 during use, the vertical cylinder 11 and the horizontal cylinder 12 are square pipes in the present application.

Further, in an embodiment of the present application, in order to improve convenience and stability of use, the pipe sleeves 7 are respectively sleeved on the upper end of the vertical tube 11 and the two ends of the horizontal tube 12, and the gap between the fixing component 2 and the horizontal tube 12 and the gap between the inserting portion 31 and the vertical tube 11 are eliminated through the pipe sleeves 7, so that the structure of the whole headrest is more stable during actual use, and the headrest is not loosened after use.

Referring to fig. 1 and 2, in the present application, the headrest assembly 4 includes a headrest main body 41 and an insertion rod 42 mounted at the back of the headrest main body 41, wherein the insertion rod 42 is movably inserted into the upright tube 11, and the two can be directly sleeved and fixed to be locked, or an adjustment buckle 5 can be mounted, and the insertion rod 42 is locked in the upright tube 11 by adjusting the manner that the buckle 5 presses the pressing block 6. The outer surface of the headrest main body 41 is coated with a leather skin, which is convenient for later cleaning.

With further reference to fig. 3 and 4, since the fixing member 2 is used as a fixing part between the headrest and the wheelchair, the convenience of the whole headrest is directly determined by whether the fixing member 2 is easily assembled or disassembled. For this reason, in practical use, the fixing component 2 can be mounted on the push tube of the wheelchair by adopting a conventional screw fastening mode, but the structure still cannot realize quick assembly and disassembly in later assembly and disassembly. In one embodiment of the application, a fixing assembly 2 structure capable of realizing quick dismounting and fixing is provided, wherein the fixing assembly 2 comprises an L-shaped pipe 21, a fixing body 22 and a hinge 23 with one side hinged to the fixing body 22, one end of the L-shaped pipe 21 is movably inserted into one end of the cross cylinder 12, the fixing body 22 is movably sleeved on the other end of the L-shaped pipe 21, and the fixing body 22 is also locked on the L-shaped pipe 21 by adjusting the pressing block 6 pressed by the snapping buckle 5; one end of the hinge 23 swinging outwards is fixed on the fixing main body 22 through a screw 24, and forms a clamping space 25 for clamping the wheelchair push pipe together with the fixing main body 22. Wherein, the L-shaped pipe 21 can be obtained by bending a square pipe in order to match the shape of the horizontal tube 12; the long end of the L-shaped pipe 21 can be used as a telescopic end to be movably inserted on the transverse cylinder 12. In use, the L-shaped pipe 21 is fixed relative to the transverse cylinder 12, and the pressing block 6 is pressed against the buckling block 5 to realize position fixing. In practical use, the fixing main body 22 can be fixed on a hand push pipe of the wheelchair at one time through the hinge 23, and the fixing main body 22 and the L-shaped pipe 21 can be loosened at the later stage only by adjusting the snapping buckle 5, so that all parts except the fixing main body 22 can be detached. Of course, in actual use, the hinge 23 can be fixed to the push tube of the wheelchair by loosening the screw 24. Similarly, in practical use, the pipe sleeve 7 is also arranged between the fixing main body 22 and the L-shaped pipe 21, so as to improve the fit tightness between the fixing main body and the L-shaped pipe.

Referring to fig. 1 to 3, in the present application, the insertion portion 31 and the connecting portion 32 can swing relative to each other, so that the two are locked to each other, so that the headrest assembly 4 can swing at any angle within a certain range. The rotating base 3 further comprises an adjusting rotating shaft 33, the inserting portion 31 and the connecting portion 32 are respectively rotatably mounted at one corresponding end of the adjusting rotating shaft 33, and the adjusting rotating shaft 33 can lock a swing included angle between the inserting portion 31 and the connecting portion 32. Through adjusting the relative swing that pivot 33 comes locking cartridge portion 31 and connecting portion 32 in this application, and then can fix the swing angle of headrest subassembly 4, and then realize the position locking, improve patient's comfort level. It should be noted that the adjusting shaft 33 may be a conventional damping shaft structure, as long as the relative positioning between the insertion portion 31 and the connecting portion 32 can be realized.

Referring further to fig. 3 to 7, if the adjustment shaft 33 is a damping shaft structure, it is difficult for a person with a small force to adjust the relative angle between the insertion portion 31 and the connection portion 32 due to the damping force. To this end, in an embodiment of the present application, an adjusting rotating shaft 33 structure is provided, which facilitates adjustment, wherein the adjusting rotating shaft 33 includes a left rotating sleeve 331, a right rotating sleeve 332, a locking assembly and a button 333, one end of the inserting portion 31 is connected to the right rotating sleeve 332, and one end of the connecting portion 32 is connected to the right rotating sleeve 332; the two ends of the locking component are respectively inserted into the left rotating sleeve 331 and the right rotating sleeve 332, the left rotating sleeve 331 and the right rotating sleeve 332 can rotate relative to each other on the locking component, the button 333 is mounted on the right rotating sleeve 332, and the output end of the button 333 can drive the locking component to be unlocked so as to enable the left rotating sleeve 331 to rotate relative to the right rotating sleeve 332. The left-turn bush 331 and the right-turn bush 332 each have a hollow cylindrical structure, but the internal structures thereof are different from each other, and the present application will be described in detail below.

Referring to fig. 6, the locking assembly includes a spring 334, a gear 335 and a detent flange 336, the gear 335 is coaxially inserted into the left-turn sleeve 331, and the gear 335 can only slide in the axial direction of the left-turn sleeve 331 within the left-turn sleeve 331; in order to realize that the gear 335 can synchronously rotate with the left rotating sleeve 331 and can slide along the axial direction of the left rotating sleeve 331, a tooth socket 33c matched with teeth on the gear 335 is arranged on the inner wall of the left rotating sleeve 331. In addition, the spring 334 is arranged in the left rotating sleeve 331, and two ends of the spring are respectively connected with the bottom of the left rotating sleeve 331 and the side surface of the gear 335; the clamping flange 336 is clamped in one end, close to the left rotating sleeve 331, of the right rotating sleeve 332, and the spring 334 can press the gear 335 to be attached and abutted to the clamping flange 336; a locking bolt 337 is inserted into the left-turn sleeve 331, one end of the locking bolt 337 passes through the spring 334, the gear 335 and the clamping flange 336 in sequence, and the left-turn sleeve 331 and the right-turn sleeve 332 are locked by a locking nut; the button 333 is movably inserted into the other end of the right rotating sleeve 332, one end of the button 333 extends out of the right rotating sleeve 332, the other end of the button 333 movably penetrates through the clamping flange 336 and can press the gear 335 to slide in the left rotating sleeve 331 so as to drive the gear 335 to be separated from the clamping flange 336. It should be noted that, in the above embodiment, the connection between the left-turn sleeve 331 and the right-turn sleeve 332 is basically realized by the cooperation of the locking bolt 337 and the locking nut, so that the left-turn sleeve 331 and the right-turn sleeve 332 can maintain the fastened state. For this reason, the locking flange 336 needs to rotate synchronously with the right rotary sleeve 332 during use, or the locking flange and the right rotary sleeve 332 are of an integral structure, but considering the problem of structural installation in the right rotary sleeve 332, in one embodiment of the present application, the locking flange 336 is installed in the right rotary sleeve 332 by interference fit or screw fixation. This allows the detent flange 336 to rotate synchronously with the right turn sleeve 332 during use, while also providing a fixed base for the locking bolt 337. It should be noted that, for the convenience of installation, the lock nut and the locking flange 336 may be an integral structure in the present application.

In the above embodiment, the friction force between the gear 335 and the locking flange 336 can be used to lock the left rotating sleeve 331 and the right rotating sleeve 332 relative to each other, so as to realize the relative angle between the insertion portion 31 and the connecting portion 32. The relative locking of the left-turn sleeve 331 and the right-turn sleeve 332 can also be realized by the technical scheme that the gear 335 is clamped on the clamping flange 336. Of course, in practical use, in order to reduce the requirement for the spring 334 and the force of the user pressing the button 333, in one embodiment of the present application, the gear 335 has a ratchet 338 on the side near the detent flange 336, and the detent flange 336 has a ratchet groove 339 matching the ratchet 338. The ratchet 338 is matched with the ratchet groove 339, so that the contact area between the gear 335 and the clamping flange 336 is increased, and the ratchet groove 339 limits the ratchet 338, so that the left rotating sleeve 331 and the right rotating sleeve 332 are locked relatively.

Referring to fig. 7, in actual use, in order to press the button 333 against the gear 335 to force the gear 335 to separate from the retaining flange 336, in a preferred embodiment of the present application, the retaining flange 336 is provided with a plurality of through holes 33a, the button 333 is provided with a plurality of pressing tongues 33b matching with the through holes 33a, and the pressing tongues 33b pass through the through holes 33a and can abut against the side surfaces of the gear 335. In order to prevent the button 333 from being pulled out of the right-turn bushing 332, the top pressing tongue 33b is provided with a barb.

Referring to fig. 6, the entire locking assembly is simple to use, when the relative swing angle between the insertion portion 31 and the connection portion 32 needs to be adjusted, a user only needs to press the button 333, the button 333 is pressed against one side of the right rotating sleeve 332 and the left rotating sleeve 331, and then the pressing tongue 33b penetrates through the through hole 33a to abut against the side surface of the gear 335, so as to push the gear 335 to be separated from the retaining flange 336, at this time, the spring 334 is in a compressed state, and at this time, because there is no relative limitation between the gear 335 and the retaining flange 336, the right rotating sleeve 332 and the left rotating sleeve 331 can rotate relatively, and further, the included angle between the insertion portion 31 and the connection portion 32 can be adjusted according to requirements. When the included angle between the inserting part 31 and the connecting part 32 needs to be locked, a user only needs to loosen the pressed button 333, at this time, due to the fact that the acting force on the button 333 is removed, the spring 334 naturally resets, the jacking gear 335 is abutted and attached to the clamping flange 336, the right rotating sleeve 332 and the left rotating sleeve 331 are locked relatively by the limiting effect of the ratchet grooves 339 on the ratchet 338, and then the included angle between the inserting part 31 and the connecting part 32 is locked.

The multifunctional wheelchair headrest disclosed by the invention is convenient and reliable in a position adjusting and locking mode by utilizing the adjusting rotating shaft 33, can be randomly locked according to the requirements of patients, and is wide in application range. In addition, through the concrete structure of the fixed subassembly 2 of design, adopt to adjust to break off with the fingers and thumb the mode of buckling 5 locking and fix the locking in this application for whole headrest easy dismounting. The headrest can realize height, width and front-back adjustment, can adapt to wheelchairs of different specifications and patients of different body types, and has strong applicability.

Of course, the present invention may have other embodiments, and based on the embodiments, those skilled in the art can obtain other embodiments without any creative effort, and all of them are within the protection scope of the present invention.