CN211382263U

CN211382263U - Buffer device of wheelchair headrest

Info

Publication number: CN211382263U
Application number: CN201921844988.4U
Authority: CN
Inventors: 杨博弈; 吴添贵
Original assignee: Alu Rehab Xiamen Co ltd
Current assignee: Alu Rehab Xiamen Co ltd
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2020-09-01
Anticipated expiration: 2029-10-30

Abstract

The utility model provides a buffer device of a wheelchair headrest, which is arranged on a horizontal cross rod and comprises a first buffer structure, wherein the first buffer structure comprises an upper supporting seat, a lower supporting seat, at least one swinging plate and a damping part, the horizontal cross rod is fixedly connected with the top of the upper supporting seat, and the horizontal cross rod (1) and the lower supporting seat (215) can move back and forth relatively through a sliding mechanism (21); the upper end and the lower end of the swinging plate (22) are respectively hinged to one side of the horizontal cross rod (1) opposite to the lower support seat (215); one end of the damping piece is hinged with the lower end of the swinging plate, and the other end of the damping piece is hinged with the lower supporting seat; when the head leans against the headrest, the horizontal cross rod can receive a horizontal backward acting force to drive the swinging plate to move backwards, and meanwhile, the swinging plate compresses the damping piece at the bottom to realize the buffering of the headrest.

Description

Buffer device of wheelchair headrest

Technical Field

The utility model relates to a wheelchair head rest technical field, in particular to buffer of wheelchair head rest.

Background

The head rest of the traditional wheelchair is provided with a cushion body made of shock-absorbing materials such as high-density foaming sponge or foam on the part contacted with the head of a human body, so that the external impact force can be reduced and dispersed, the aims of protecting the head of a user and reducing injury are fulfilled, but the cushion body can be deformed in a small range generally to transmit and absorb the impact force, and the impact force cannot be sufficiently and effectively dispersed and absorbed only by the cushion body when the impact force is large.

Chinese patent application (application No. 201220489177.9, applicant's 2012.09.24) discloses a wheelchair headrest 10 ' with a buffering function, as shown in fig. 1-2, comprising a headrest body 1 ', a horizontal cross-bar 13 ', hack-bars 2 ' supporting the headrest body, and two damping pieces 3 ', said headrest body 1 ' being composed of a cushion body 11 ' and a back plate 12 ' fixing the cushion body; the top of the hack lever 2 'is provided with a bearing 21' matched with the horizontal cross bar 13 ', the middle part of the bearing 21' forms a through chute 211 'which is penetrated back and forth, the horizontal cross bar 13' is sleeved in the chute 211 'and can move back and forth along the chute 211' in a telescopic manner, two parallel and symmetrical guide rails 22 'are arranged on two sides of the bearing 21', and each guide rail 22 'is provided with a guide groove 221' with an open top; the two damping pieces 3 ' are symmetrically arranged between the headrest body 1 ' and the hack lever 2 ', one end of each damping piece is acted on the headrest body 1 ', the other end of each damping piece is acted on the hack lever 2 ', each damping piece 3 ' is a damping cylinder, one end of each damping cylinder is locked on the horizontal cross rod 13 ', the other end of each damping cylinder is connected to the guide rail 22 ' through the locking rod 4 ', and the front end of each locking rod 4 ' extends into the guide groove 221 '. During use, the locking rods 4 ' are loosened, the damping cylinders are loosened, the horizontal cross rods 13 ' can move back and forth along the hack-rod sliding grooves 211 ', the distance between the headrest body 1 ' and the hack rods 2 ' is adjusted to adapt to different requirements of a user, the locking rods 4 ' are locked after the distance is determined, the damping cylinders are locked on the guide rails 22 ', the headrest body 2 ' has a buffering effect under the action of the two damping cylinders 3 ', the impact force can be dispersed to a certain extent, however, the buffering effect is not ideal, and the effect of protecting and reducing injury is limited.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving the technical problem in the above-mentioned technique to a certain extent at least. Therefore, an object of the present invention is to provide a damping device for a wheelchair headrest.

In order to achieve the above object, an embodiment of a first aspect of the present invention provides a buffer device for a wheelchair headrest, which is disposed on a horizontal cross bar, and includes a first buffer structure, where the first buffer structure includes an upper support base, a lower support base, at least one swinging plate and a damping member, and the horizontal cross bar is fixedly connected to the top of the upper support base, and the horizontal cross bar and the lower support base can move back and forth relatively through a sliding mechanism; the upper end and the lower end of the swinging plate are respectively hinged to one side of the horizontal cross rod opposite to the lower supporting seat; one end of the damping piece is hinged with the lower end of the swinging plate, and the other end of the damping piece is hinged with the lower supporting seat.

Based on the design, when the head leans against the headrest, the horizontal cross rod can be driven by a horizontal backward acting force to drive the swinging plate to move backwards, and meanwhile, the swinging plate compresses the damping piece at the bottom to realize the buffering of the headrest.

In addition, according to the utility model discloses a buffer of wheelchair headrest that above-mentioned embodiment provided can also have following additional technical characteristics:

the first buffer structure also comprises a locking mechanism, the locking mechanism is positioned below the swinging plate, and the locking mechanism comprises a first knob and a rotating shaft; the first knob is fixedly connected to the head of the rotating shaft and can drive the rotating shaft to rotate; the rotating shaft is rotatably fixed at the bottom in the lower supporting seat, and the middle part of the rotating shaft is provided with a notch part; when the swing plate is in a locked state, the lower end of the swing plate is abutted against the outer circumferential surface of the rotating shaft, and when the swing plate is in an unlocked state, the notch part of the rotating shaft is arranged towards the lower end of the swing plate; the locking mechanism is used for controlling the opening and closing of the headrest buffering function.

The locking mechanism also comprises a first spring, and the tail part of the rotating shaft is provided with a first annular groove; the first spring is sleeved on the first annular groove and clamped in the lower supporting seat;

the first knob is positioned outside the lower supporting seat, and two opposite sides of the lower end face of the first knob are provided with a first upper positioning column and a first lower positioning column; a first groove group and a first sliding chute are respectively arranged on the lower supporting seat corresponding to the first upper positioning column and the first lower positioning column, and the first groove group comprises three first grooves which are sequentially arranged along the circumference; the first upper positioning column is inserted into the first groove; the first lower positioning column is inserted into the first sliding groove and can be arranged along the first sliding groove in a sliding mode; when the damper function is to be turned on or off, the notch portion or the outer circumferential surface of the rotation shaft may be directed toward the swing plate.

The middle of the first groove is a long groove, and the first lower positioning column can be arranged along the long groove in a sliding mode; the first lower positioning column slides in the long groove and can finely adjust the part of the rotating shaft facing the swinging plate.

The upper support seat and the lower support seat can move back and forth relatively through the sliding mechanism; the horizontal cross rod is fixedly connected to the upper support seat; the upper end and the lower end of the swinging plate are respectively hinged to one side of the upper supporting seat opposite to the lower supporting seat;

the number of the swing plates is two, the two swing plates are arranged in parallel in the front and at the back and are respectively hinged with the upper supporting seat and the lower supporting seat, so that the swing plate is more stable during swinging.

The sliding mechanism comprises two pairs of connecting plates, each pair of connecting plates is respectively and correspondingly arranged in front of and behind the upper supporting seat and the lower supporting seat, and the lower and upper ends of each connecting plate are respectively hinged with the upper supporting seat and the lower supporting seat; the orthographic projection surface of the shell formed by combining the upper supporting seat, the lower supporting seat and the two pairs of connecting plates is of a parallel four-bar structure, so that the shell is more stable during swinging.

The top of the upper supporting seat is provided with a cavity, the horizontal cross rod is arranged in the cavity, and a plurality of positioning holes are axially arranged on the upper surface of the horizontal cross rod at intervals;

the first buffer structure also comprises a positioning mechanism, and the positioning mechanism comprises a sealing cover, a second knob and a positioning pin; the sealing cover is fixedly connected to the top of the upper supporting seat and covers the cavity, and the top end of the sealing cover is provided with a containing part matched with the second knob; the second knob is placed in the holding portion, the locating pin passes second knob and closing cap from last to down in proper order to in inserting horizontal pole's a locating hole, so design can fix horizontal pole at last support top, realizes that horizontal pole and last support interlock set up.

The positioning mechanism further comprises a second spring and a clamping ring, a second annular groove is formed in the lower portion of the positioning pin, and the clamping ring is arranged on the horizontal cross rod and sleeved in the second annular groove; the lower surface of the sealing cover is provided with a concave part, and the second spring is sleeved on the positioning pin and clamped between the concave part and the clamping ring; two opposite sides of the lower end face of the second knob are provided with a second upper positioning column and a second lower positioning column; a second groove group and a second sliding groove are respectively arranged at the accommodating part corresponding to the second upper positioning column and the second lower positioning column, the second groove group comprises at least two second grooves which are sequentially arranged along the circumference, the second upper positioning column is inserted into one second groove, and the second lower positioning column is inserted into the second sliding groove and can be arranged along the second sliding groove in a sliding manner; so set up, can adjust the position of horizontal pole to the people that the adaptation height is different.

The number of the second grooves is three, and the second upper positioning columns are inserted into one of the three second grooves; and in the third second groove, the depth of the second groove in the middle is greater than the depths of the other two second grooves. When the second upper positioning column is inserted into the middle second groove, the horizontal cross rod is in a locking state, and the middle second groove is deeper in depth and can be positioned more firmly.

A guide groove is formed in the lower end face of the second knob, which is close to the second lower positioning column, a guide column is arranged in the accommodating part, which corresponds to the guide groove, and the guide column is inserted into the guide groove and can be arranged along the guide groove in a sliding manner; when the second knob is rotated under the resilience force of the second spring, the guiding and positioning functions are achieved.

The sliding mechanism comprises two pairs of connecting plates, each pair of connecting plates are respectively and correspondingly arranged in front of and behind the horizontal cross rod and the lower supporting seat, and the upper end and the lower end of each connecting plate are respectively hinged with the horizontal cross rod and the lower supporting seat.

The number of the swing plates is two, the two swing plates are arranged in parallel in the front and at the back and are respectively hinged with the horizontal cross rod and the lower supporting seat.

The damping piece is a damping cylinder or a gas spring or a spring.

The back board and the second buffer structure, the second buffer structure includes a fixed mount, a connecting piece, two guide rods and two linear bearings; the fixing frame is fixedly connected to the back of the headrest back plate and is provided with two parallel transverse edges; the connecting piece is respectively fixedly connected with the horizontal cross rod and the two linear bearings and is arranged in a linkage manner; each linear bearing can be sleeved on a guide rod in a vertically moving manner; each guide rod is fixed between the two transverse edges, the upper part and the lower part of each guide rod are respectively sleeved with an elastic part, and the elastic parts are clamped between the linear bearings and the transverse edges. The horizontal cross rod can receive a forward acting force along with the fluctuation and the forward and backward swing of the upper supporting seat, so that the connecting piece and the two linear bearings are driven to compress the elastic part up and down, and the head rest is further buffered.

The second buffer structure also comprises at least one clamp, the clamp clamps the upper part or the lower part of the two guide rods and is arranged between the linear bearing and the transverse edge, and the clamp can close the buffer effect of the head back board.

The number of the clamps is two, and the two clamps clamp the upper parts and the lower parts of the two guide rods respectively.

The back of the headrest back plate is provided with an accommodating cavity, and the fixing frame is fixedly connected in the accommodating cavity; the connecting piece is provided with a connecting head and a swinging head, the connecting head is provided with a horizontally arranged object placing groove, one end of the horizontal cross rod is inserted into the object placing groove and is fixedly connected with the connecting head through a positioning piece; and the two linear bearings are arranged on the swinging head in a penetrating way and are arranged in an interference fit way with the swinging head.

Drawings

Fig. 1 is an exploded view of a headrest of a wheelchair having a buffering function in the related art.

Fig. 2 is a schematic structural view of a conventional wheelchair headrest having a buffering function.

Fig. 3 is an exploded view of the cushioning device of the headrest of the wheelchair of the present invention.

Fig. 4 is a schematic view of the normal state of the cushioning device of the headrest of the wheelchair of the present invention.

Fig. 5 is a schematic view of the compression state of the cushioning device of the headrest of the wheelchair of the present invention.

Fig. 6 is a cross-sectional view of the damping device of the headrest of the wheelchair of the present invention.

Fig. 7 is a matching view of the locking mechanism and the swing plate of the present invention.

Fig. 8 is a schematic structural diagram of the first knob according to the present invention.

Fig. 9 is a schematic structural diagram of the first knob according to the present invention.

Fig. 10 is a schematic structural view of a second knob according to the present invention.

Fig. 11 is a schematic structural view of the middle sealing cap of the present invention.

Fig. 12 is an exploded view of a second cushioning structure according to the present invention.

Fig. 13 is an orthographic view of the second buffer structure of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

Only lean on damping cylinder 3 ''s flexible effect to among the prior art headrest body 2 ' plays the cushioning effect, the utility model discloses a parallel four-bar linkage structure of fluctuation swing around can (by last supporting seat 214, under bracing seat 215 and connecting plate 216 are constituteed), the fluctuation swing around driving swing plate 22 to compress damping piece 23, thereby play the cushioning effect to the headrest, solved the unsatisfactory effect of prior art buffering effect well, the utility model discloses except that the flexible certain cushioning effect that brings of damping piece 23, go up supporting seat 214, under bracing seat 215 and swing plate 22 fluctuation swing around and produce certain displacement, can further play the cushioning effect, consequently the utility model discloses a buffering effect to the wheelchair is very good.

In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.

Example 1

Referring to fig. 3-6, a cushioning device 100 of a wheelchair headrest is arranged on a horizontal cross bar 1, the headrest is arranged above the wheelchair corresponding to the head of a human body, and the cushioning device 100 comprises a backrest plate 3, a first cushioning structure 2 and a second cushioning structure 4; the first buffer structure 2 comprises an upper supporting seat 214, a lower supporting seat 215, at least one swinging plate 22, a damping piece 23, a locking mechanism 24 and a positioning mechanism 25, and the horizontal cross rod 1 is fixedly connected to the upper supporting seat 214; the upper supporting seat 214 and the lower supporting seat 215 can move back and forth relatively through a sliding mechanism 21; the swinging plate 22 and the damping piece 23 are both arranged inside the lower support base 215, and the upper end and the lower end of the swinging plate 22 are respectively hinged to one side of the upper support base 214 opposite to the lower support base 215; one end of the damping piece 23 is hinged with the lower end of the swinging plate 22, and the other end is hinged with the lower supporting seat 215; when in the working state, the horizontal cross bar 1 drives the upper support base 214, the lower support base 215 and the swing plate 22 to swing under the action of an external force, and compresses the damping member 23. The damping member 23 is a damping cylinder or a gas spring or a spring. The top of the upper supporting seat 214 is provided with a cavity 213, the horizontal cross bar 1 is arranged in the cavity 213, and a plurality of positioning holes 11 are axially arranged on the upper surface of the horizontal cross bar 1 at intervals; the sliding mechanism 21 includes two pairs of connecting plates 216, and every pair of connecting plates 216 are located preceding, the back of going up supporting seat 214 and lower supporting seat 215 respectively correspondingly, and every the lower both ends of going up of connecting plate 216 are articulated with going up supporting seat 214 and lower supporting seat 215 respectively, and the orthographic projection face of the casing that goes up supporting seat 214 and lower supporting seat 215, two pairs of connecting plates 216 combination is parallel four-bar linkage structure, and is more firm during the messenger swings. The number of the swing plates 22 is two, and the two swing plates 22 are arranged in parallel in the front and back direction and are hinged with the upper support seat 214 and the lower support seat 215 respectively, so that the swing is more stable during swinging.

Referring again to fig. 3, 6 and 10-11, the positioning mechanism 25 includes a cover 251, a second knob 252, a positioning pin 253, a second spring 254 and a retaining ring 255; the cover 251 is fixedly connected to the top of the upper supporting seat 214 and covers the cavity 213, and the top end of the cover 251 has a receiving portion 2511 matched with the second knob 252; the second knob 252 is placed in the accommodating portion 2511, the positioning pin 253 sequentially passes through the second knob 252 and the sealing cover 251 from top to bottom, and is inserted into a positioning hole 11 of the horizontal cross rod 1, so that the horizontal cross rod 1 can be fixed on the top of the upper supporting seat 214, and the horizontal cross rod 1 and the upper supporting seat 214 are arranged in a linkage manner. The lower part of the positioning pin 253 is provided with a second annular groove 2531, and the snap ring 255 is arranged on the horizontal cross rod 1 and sleeved in the second annular groove 2531; the lower surface of the cover 251 is provided with a concave portion 2513, and the second spring 254 is sleeved on the positioning pin 253 and clamped between the concave portion 2513 and the retaining ring 255; a second upper positioning column 2521 and a second lower positioning column 2522 are arranged on two opposite sides of the lower end surface of the second knob 252; the accommodating portion 2511 is provided with a second groove group J and a second sliding groove g respectively corresponding to the second upper positioning column 2521 and the second lower positioning column 2522, the second groove group J includes at least two second grooves J1 sequentially arranged along the circumference, the second upper positioning column 2521 is inserted into a second groove J1, and the second lower positioning column 2522 is inserted into the second sliding groove g and can be slidably arranged along the second sliding groove g. When the horizontal position of the horizontal bar 1 on the upper supporting seat 214 is to be adjusted, the lower portion of the second knob 252 is pressed and rotated, the second upper positioning post 2521 tilts and is transferred to another second groove J1, then the second knob 252 is loosened, under the action of the second spring 254, the second lower positioning post 2522 slides to a certain displacement along the second sliding groove g, the positioning pin 253 is separated from the horizontal bar 1, and the horizontal position of the horizontal bar 1 can be adjusted to adapt to people with different heights. The number of the second grooves J1 is three, and the second upper positioning column 2521 is inserted into one of the three second grooves J1; of the three second grooves J1, the depth of the second groove J1 located in the middle is greater than the depths of the remaining two second grooves J1. When the second upper positioning posts 2521 are inserted into the middle second grooves J1, the horizontal cross bar 1 is in a locked state, and the middle second grooves J1 are deeper and can be positioned more firmly. A guide slot 2523 is formed on the lower end surface of the second knob 252 adjacent to the second lower positioning post 2522, a guide post 2512 is disposed in the accommodating portion 2511 corresponding to the guide slot 2523, the guide post 2512 is inserted into the guide slot 2523 and can slide along the guide slot 2523; when the second knob 252 is rotated by the resilient force of the second spring 254, it plays a role of guiding and positioning.

Referring again to fig. 3 and 6-9, the locking mechanism 24 is located below the swing plate 22, and the locking mechanism 24 includes a first knob 241, a rotating shaft 242, and a first spring 243; the first knob 241 is fixedly connected to the head of the rotating shaft 242, and the first knob 241 can drive the rotating shaft 242 to rotate; the rotating shaft 242 is rotatably fixed at the bottom of the lower supporting seat 215, and a notch a is formed in the middle of the rotating shaft 242; the lower end of the swing plate 22 abuts on the outer circumferential surface of the rotating shaft 242 in the locked state, and the notch a of the rotating shaft 242 is provided toward the lower end of the swing plate 22 in the unlocked state. The first knob 241 is rotated to drive the rotating shaft 242 to rotate, when the notch a of the rotating shaft 242 is retracted from the lower end of the swing plate 22, the swing plate 22 compresses the damping member 23, when the outer circumferential surface of the rotating shaft 242 faces the swing plate 22, the swing plate 22 cannot compress the damping member 23, and the locking mechanism 24 is used for controlling the headrest buffering function to be turned on and off. The tail of the shaft 242 has a first ring groove (not shown); the first spring 243 is sleeved on the first ring groove and clamped inside the lower support 215; the first knob 241 is located outside the lower support base 215, and two opposite sides of the lower end surface of the first knob 241 are provided with a first upper positioning column 2411 and a first lower positioning column 2412; a first groove group 211 and a first sliding groove 212 are respectively arranged on the lower support seat 215 corresponding to the first upper positioning column 2411 and the first lower positioning column 2412, and the first groove group 211 comprises three first grooves 2111 which are sequentially arranged along the circumference; the first upper positioning column 2411 is inserted into one of the first grooves 2111; the first lower positioning post 2412 is inserted into the first sliding groove 212 and can be slidably disposed along the first sliding groove 212. When the buffering function is to be turned on or off, the lower portion of the first knob 241 is pressed and rotated, the first upper positioning column 2411 at the upper portion tilts and transfers to another first groove 2111, then the first knob 241 is loosened, under the action of the first spring 243, the first lower positioning column 2412 slides to a certain displacement along the first sliding slot 212, and simultaneously the rotating shaft 242 rotates to a corresponding position, so that the notch a or the outer circumferential surface of the rotating shaft 242 faces the swing plate 22. The middle one of the first grooves 2111 is an elongated slot 211k, and the first lower positioning column 2412 can be slidably disposed along the elongated slot 211 k; first lower positioning posts 2412 slide in long grooves 211k, and can finely adjust the position of rotating shaft 242 facing swing plate 22.

Referring to fig. 4, fig. 6 and fig. 12-13, the second buffer structure 4 includes a fixing frame 41, a connecting member 42, two guide rods 43, two linear bearings 44 and at least one clamp 46; the fixing frame 41 is fixedly connected to the back of the back headrest plate 3, that is, the back of the back headrest plate 3 is provided with an accommodating cavity 31; the fixing frame 41 is fixedly connected in the accommodating cavity 31, and the fixing frame 41 has two parallel transverse edges 411; the connecting piece 42 is fixedly connected with the horizontal cross bar 1 and the two linear bearings 44 respectively and is arranged in a linkage manner; the connecting piece 42 is provided with a connecting head 421 and a swinging head 422, the connecting head 421 is provided with a horizontally arranged object placing groove 423, one end of the horizontal cross rod 1 is inserted into the object placing groove 423 and is fixedly connected with the connecting head 421 through a positioning piece; the two linear bearings 44 are all arranged on the swinging head 422 in a penetrating way and are arranged in an interference fit way with the swinging head 422. The two linear bearings 44 are both vertically arranged, and each linear bearing 44 can be sleeved on a guide rod 43 in a vertically moving manner; each guide rod 43 is fixed between two transverse edges 411, an elastic part 45 is respectively sleeved on the upper part and the lower part of each guide rod 43, and the elastic part 45 is clamped between the linear bearing 44 and one transverse edge 411. The horizontal cross bar 1 is stressed when swinging back and forth along with the fluctuation of the upper supporting seat 214, so as to drive the connecting piece 42 and the two linear bearings 44 to compress the elastic part 45 up and down, and further play a role in buffering the head rest. The resilient member 45 is preferably a spring. The clamp 46 clamps the upper or lower parts of the two guide rods 43 and is arranged between the linear bearing 44 and one transverse edge 411, and the arrangement of the clamp 46 can close the buffering effect of the head-back plate 3; the number of the clips 46 is preferably two, and the two clips 46 respectively clip the upper and lower portions of the two guide bars 43. The back of the back headrest plate 3 is provided with two clamping frames for placing the clips 46, and the clips 46 can be clamped on the clamping frames.

Referring to fig. 4, 6 and 13 again, when the utility model is applied to work, when the head is supported against the headrest, the horizontal cross rod 1 will receive a horizontal backward acting force, and then apply a backward acting force to the upper supporting seat 214, so as to drive the upper supporting seat 214 to move backward and then up and down, finally the lower supporting seat 215 and the connecting plate 216 swing forward, the swinging plate 22 then rises upward and swings forward, and the bottom of the swinging plate 22 compresses the damping piece 23, thereby realizing the buffering of the headrest; the horizontal cross bar 1 swings back and forth along with the fluctuation of the upper supporting seat 214 and is simultaneously subjected to the backward and forward acting forces, so that the connecting piece 42 and the two linear bearings 44 are driven to compress the elastic part 45 up and down, the head leaning on the vertical direction is corrected, the fluctuation of the head leaning on the vertical direction is offset, and the headrest basically has the buffer effect in the horizontal direction. First buffer structure 2 and second buffer structure 4's setting makes the utility model discloses a buffering dynamics is very big, and buffering effect is very good.

Example 2

This part differs from example 1 in that:

a buffer device 100 of a wheelchair headrest is arranged on a horizontal cross rod 1 and comprises a first buffer structure 2, wherein the first buffer structure 2 comprises a lower supporting seat 215, at least one swinging plate 22 and a damping piece 23, and the horizontal cross rod 1 and the lower supporting seat 215 can move back and forth relatively through a sliding mechanism 21; the upper end and the lower end of the swinging plate 22 are respectively hinged on one side of the horizontal cross rod 1 opposite to the lower support seat 215; one end of the damping piece 23 is hinged with the lower end of the swinging plate 22, and the other end is hinged with the lower supporting seat 215.

The sliding mechanism 21 includes two pairs of connecting plates 216, each pair of connecting plates 216 is respectively and correspondingly disposed in front of and behind the horizontal cross bar 1 and the lower support base 215, and the upper and lower ends of each connecting plate 216 are respectively hinged to the horizontal cross bar 1 and the lower support base 215. The number of the swing plates 22 is two, and the two swing plates 22 are arranged in parallel in front and back and are respectively hinged with the horizontal cross rod 1 and the lower support seat 215. I.e. fig. 4 and 6, the upper support 214 is removed and the swing plate 22 and the connecting plate 216 are hinged directly to the upper support 214.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "first" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "first" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above should not be understood to necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. The utility model provides a buffer (100) of wheelchair headrest, locates on horizontal pole (1), its characterized in that: the damping device comprises a first buffering structure (2), wherein the first buffering structure (2) comprises a lower supporting seat (215), at least one swinging plate (22) and a damping piece (23), and the horizontal cross rod (1) and the lower supporting seat (215) can move back and forth relatively through a sliding mechanism (21); the upper end and the lower end of the swinging plate (22) are respectively hinged to one side of the horizontal cross rod (1) opposite to the lower support seat (215); one end of the damping piece (23) is hinged with the lower end of the swinging plate (22), and the other end is hinged with the lower supporting seat (215).

2. A cushioning device (100) of a wheelchair headrest according to claim 1, characterized in that: the first cushioning structure (2) further comprises a locking mechanism (24), the locking mechanism (24) is positioned below the swing plate (22), and the locking mechanism (24) comprises a first knob (241) and a rotating shaft (242); the first knob (241) is fixedly connected to the head of the rotating shaft (242), and the rotating shaft (242) can be driven to rotate by the first knob (241); the rotating shaft (242) is rotatably fixed at the bottom in the lower supporting seat (215), and the middle part of the rotating shaft (242) is provided with a notch part (a); when the swing plate is in a locked state, the lower end of the swing plate (22) abuts against the outer circumferential surface of the rotating shaft (242), and when the swing plate is in an unlocked state, the notch (a) of the rotating shaft (242) is arranged towards the lower end of the swing plate (22).

3. A cushioning device (100) of a wheelchair headrest according to claim 2, characterized in that: the locking mechanism (24) further comprises a first spring (243), and the tail part of the rotating shaft (242) is provided with a first annular groove; the first spring (243) is sleeved on the first annular groove and clamped inside the lower support seat (215);

the first knob (241) is positioned outside the lower support seat (215), and two opposite sides of the lower end surface of the first knob (241) are provided with a first upper positioning column (2411) and a first lower positioning column (2412); a first groove group (211) and a first sliding groove (212) are respectively arranged on the lower supporting seat (215) corresponding to the first upper positioning column (2411) and the first lower positioning column (2412), and the first groove group (211) comprises three first grooves (2111) which are sequentially arranged along the circumference; the first upper positioning column (2411) is inserted into the first groove (2111); the first lower positioning column (2412) is inserted into the first sliding groove (212) and can be arranged along the first sliding groove (212) in a sliding manner.

4. A buffer device (100) of a wheelchair headrest as claimed in claim 3 wherein: the middle one of the first grooves (2111) is an elongated slot (211k), and the first lower positioning column (2412) can be slidably arranged along the elongated slot (211 k).

5. A cushioning device (100) of a wheelchair headrest according to claim 1, characterized in that: the device also comprises an upper supporting seat (214), wherein the upper supporting seat (214) and the lower supporting seat (215) can move back and forth relatively through the sliding mechanism (21); the horizontal cross rod (1) is fixedly connected to the upper supporting seat (214); the upper end and the lower end of the swinging plate (22) are respectively hinged on one side opposite to the upper support seat (214) and the lower support seat (215).

6. A cushioning device (100) of a wheelchair headrest according to claim 5, characterized in that: the number of the swing plates (22) is two, and the two swing plates (22) are arranged in parallel in the front and back direction and are respectively hinged with the upper supporting seat (214)) and the lower supporting seat (215).

7. A cushioning device (100) of a wheelchair headrest according to claim 5, characterized in that: the sliding mechanism (21) comprises two pairs of connecting plates (216), each pair of connecting plates (216) are correspondingly arranged in the front and the back of the upper supporting seat (214) and the lower supporting seat (215), and the upper end and the lower end of each connecting plate (216) are hinged with the upper supporting seat (214) and the lower supporting seat (215) respectively.

8. A cushioning device (100) of a wheelchair headrest according to claim 5, characterized in that: the top of the upper supporting seat (214) is provided with a cavity (213), the horizontal cross rod (1) is arranged in the cavity (213), and a plurality of positioning holes (11) are axially arranged on the upper surface of the horizontal cross rod (1) at intervals;

the first buffer structure (2) further comprises a positioning mechanism (25), and the positioning mechanism (25) comprises a cover (251), a second knob (252) and a positioning pin (253); the cover (251) is fixedly connected to the top of the upper supporting seat (214) and covers the cavity (213), and the top end of the cover (251) is provided with a containing part (2511) matched with the second knob (252); the second knob (252) is placed in the accommodating portion (2511), and the positioning pin (253) sequentially penetrates through the second knob (252) and the sealing cover (251) from top to bottom and is inserted into a positioning hole (11) of the horizontal cross rod (1).

9. The cushioning device (100) of a wheelchair headrest as claimed in claim 8, characterized in that: the positioning mechanism (25) further comprises a second spring (254) and a clamping ring (255), a second annular groove (2531) is formed in the lower portion of the positioning pin (253), and the clamping ring (255) is arranged on the horizontal cross rod (1) and sleeved in the second annular groove (2531); the lower surface of the cover (251) is provided with a concave part (2513), and the second spring (254) is sleeved on the positioning pin (253) and clamped between the concave part (2513) and the clamping ring (255);

two opposite sides of the lower end surface of the second knob (252) are provided with a second upper positioning column (2521) and a second lower positioning column (2522); the accommodating portion (2511) is provided with a second groove group (J) and a second sliding groove (g) corresponding to the second upper positioning column (2521) and the second lower positioning column (2522), the second groove group (J) comprises at least two second grooves (J1) sequentially arranged along the circumference, the second upper positioning column (2521) is inserted into a second groove (J1), and the second lower positioning column (2522) is inserted into the second sliding groove (g) and can be slidably arranged along the second sliding groove (g).

10. A buffer device (100) of a wheelchair headrest as claimed in claim 9 wherein: the number of the second grooves (J1) is three, and the second upper positioning column (2521) is inserted into one of the three second grooves (J1); of the three second grooves (J1), the depth of the second groove (J1) in the middle is greater than the depths of the other two second grooves (J1).

11. A buffer device (100) of a wheelchair headrest as claimed in claim 9 wherein: a guide groove (2523) is arranged on the lower end surface of the second knob (252) adjacent to the second lower positioning column (2522), a guide pillar (2512) is arranged in the accommodating part (2511) corresponding to the guide groove (2523), and the guide pillar (2512) is inserted into the guide groove (2523) and can be arranged in a sliding manner along the guide groove (2523).

12. A cushioning device (100) of a wheelchair headrest according to claim 1, characterized in that: the sliding mechanism (21) comprises two pairs of connecting plates (216), each pair of connecting plates (216) are correspondingly arranged in front of and behind the horizontal cross rod (1) and the lower supporting seat (215), and the upper end and the lower end of each connecting plate (216) are hinged with the horizontal cross rod (1) and the lower supporting seat (215) respectively.

13. A cushioning device (100) of a wheelchair headrest as claimed in claim 12 wherein: the number of the swing plates (22) is two, and the two swing plates (22) are arranged in parallel front and back and are respectively hinged with the horizontal cross rod (1) and the lower supporting seat (215).

14. A cushioning device (100) of a wheelchair headrest according to claim 1, characterized in that: the damping piece (23) is a damping cylinder or a gas spring or a spring.

15. A cushioning device (100) of a wheelchair headrest according to any one of claims 1 to 13, characterized in that: the backrest plate is characterized by further comprising a backrest plate (3) and a second buffering structure (4), wherein the second buffering structure (4) comprises a fixed frame (41), a connecting piece (42), two guide rods (43) and two linear bearings (44); the fixing frame (41) is fixedly connected to the back surface of the headrest backboard (3), and the fixing frame (41) is provided with two parallel transverse edges (411); the connecting piece (42) is respectively fixedly connected with the horizontal cross rod (1) and the two linear bearings (44) and is arranged in a linkage manner; each linear bearing (44) can be sleeved on a guide rod (43) in a vertically moving manner; each guide rod (43) is fixed between two transverse edges (411), an elastic part (45) is sleeved on the upper part and the lower part of each guide rod (43) respectively, and the elastic part (45) is clamped between the linear bearing (44) and one transverse edge (411).

16. A cushioning device (100) of a wheelchair headrest according to claim 15, characterized in that: the second buffer structure (4) further comprises at least one clamp (46), wherein the clamp (46) clamps the upper part or the lower part of the two guide rods (43) and is arranged between the linear bearing (44) and one transverse edge (411).

17. A cushioning device (100) of a wheelchair headrest according to claim 16, characterized in that: the number of the clips (46) is two, and the two clips (46) respectively clip the upper part and the lower part of the two guide rods (43).

18. A cushioning device (100) of a wheelchair headrest according to claim 15, characterized in that: the back of the headrest back plate (3) is provided with an accommodating cavity (31), and the fixing frame (41) is fixedly connected in the accommodating cavity (31); the connecting piece (42) is provided with a connecting head (421) and a swinging head (422), the connecting head (421) is provided with a horizontally arranged object placing groove (423), one end of the horizontal cross rod (1) is inserted into the object placing groove (423) and is fixedly connected with the connecting head (421) through a positioning piece (47); the two linear bearings (44) are arranged on the swinging head (422) in a penetrating way and are arranged in an interference fit way with the swinging head (422).