Front-back buffering mechanism of headrest and headrest device

Abstract

The utility model relates to a headrest device, in particular to a front-back buffering mechanism of a headrest. The front-back buffering mechanism comprises a swing arm assembly, a rebounding device, a base and a swing stopping frame, the swing stopping frame comprises a transverse rod, the swing stopping frame is rotationally connected with the base, so that the transverse rod can change up and down between an unlocking position and a locking position relative to the base, and a plurality of swing arms of the swing arm assembly are provided with U-shaped concave parts used for being matched with the transverse rod. The two side walls of the U-shaped concave part are arranged at intervals in the front-back direction. When the transverse rod is located at the locking position, the transverse rod is located in the U-shaped concave part, the two side walls of the U-shaped concave part prevent the corresponding swing arms from swinging, and therefore the transverse support is prevented from moving front and back relative to the base. When the transverse rod is located at the unlocking position, the transverse rod is located outside the U-shaped concave part, and the swing arm can swing. The locking mechanism is a stop swing frame, and is easy to operate and stable in structure. The headrest device comprises a headrest, a transverse support, a longitudinal support and a front-back buffering mechanism connected with the transverse support and the longitudinal support.

Description

TECHNICAL FIELD

[0001] The utility model relates to a headrest device, in particular to a front and back buffering mechanism of headrest. BACKGROUND

[0002] The traditional wheelchair headrest only relies on the soft and elastic headrest pillow to absorb the impact force to prevent the head and neck of the passenger from being injured, but the deformation range of the headrest pillow is actually small, and it cannot well cope with the situation of the passenger's epilepsy. The patent document CN110680636A provides a buffering device of a wheelchair headrest, which has obvious improvement in impact force absorption capacity compared with the traditional wheelchair headrest. For the locking mechanism of the buffering device (marked as 24 in the document drawings), the inventors of the utility model think of a new alternative solution. SUMMARY

[0003] The technical problem to be solved by the utility model is to provide an alternative solution for the locking mechanism of the buffering device provided in the above patent document (CN110680636A).

[0004] To solve the above technical problem, the utility model provides a front and back buffering mechanism of headrest and a headrest device adopting the front and back buffering mechanism. The front and back buffering mechanism and the headrest device can not only be used on wheelchair products, but also be used on other products that require head and neck buffering.

[0005] The front and back buffering mechanism includes a swing arm assembly, a rebound device, a base and a swing stop frame. The swing arm assembly includes a plurality of swing arms, the lower end and the upper end of the swing arm are respectively connected with the base and the horizontal support of the headrest, the swing arm swings to realize the front and back movement of the horizontal support relative to the base, the two ends of the rebound device are respectively connected with the base and the swing arm assembly, and the rebound device is used for realizing the reset of the swing arm. The swing stop frame includes a horizontal rod, and the swing stop frame is connected with the base in rotation, so that the horizontal rod can change the position up and down between the unlocking position and the locking position relative to the base. The swing arm assembly is provided with a "U"-shaped recess for cooperation with the horizontal rod, and the two side walls of the "U"-shaped recess are arranged in the front and back direction. When the horizontal rod is located in the locking position, the horizontal rod is located in the "U"-shaped recess, and the two side walls of the "U"-shaped recess prevent the corresponding swing arm from swinging, thereby preventing the horizontal support from moving forward and backward relative to the base. When the horizontal rod is located in the unlocking position, the horizontal rod is located outside the "U"-shaped recess, and the swing arm can swing.

[0006] The locking mechanism of the utility model is the swing stop frame. By rotating the swing stop frame, the horizontal rod of the swing stop frame is inserted into the "U"-shaped recess on the swing arm to realize the locking of the swing arm. By rotating the swing stop frame in the opposite direction, the horizontal rod of the swing stop frame is moved out of the "U"-shaped recess on the swing arm to realize the unlocking of the swing arm. The locking mechanism is easy to operate, and the structure is stable.

[0007] In an embodiment, the swing arm with the "U" shaped recess further has an arc shaped recess, when the crossbar is in the unlocked position, the crossbar is in the arc shaped recess, the arc shaped recess is in conformity with the crossbar, and the arc shaped recess and the crossbar are in surface contact; the arc shaped recess is above the "U" shaped recess.

[0008] When the swing arm is rotated from the unlocked position to the locked position, the crossbar is blocked by the "U" shaped recess, so that the swing arm cannot be further rotated; when the swing arm is rotated from the locked position to the unlocked position, the crossbar is blocked by the arc shaped recess, so that the swing arm cannot be further rotated. Therefore, the "U" shaped recess and the arc shaped recess limit the rotation range of the swing arm, which helps to improve the operation experience. In other embodiments, the arc shaped recess can not be provided, and other ways can be used to prevent the swing arm from being rotated too much, for example, a protrusion can be provided for limiting; the arc shaped recess can also be provided below the "U" shaped recess.

[0009] In an embodiment, the swing arm further includes a left side arm and a right side arm, the crossbar is fixed at the front end of the two side arms respectively, and the swing arm has a "U" shaped structure; the middle part of the side arm is rotationally connected with the base, and the base is provided with a limiting seat corresponding to the front end and the rear end of the side arm respectively; the limiting seat corresponding to the front end of the side arm is used for limiting the front end of the side arm when the crossbar is in the locked position, and the limiting seat corresponding to the rear end of the side arm is used for limiting the rear end of the side arm when the crossbar is in the unlocked position.

[0010] The limiting seat has the function of limiting the rotation range of the swing arm, which helps to improve the durability and stability of the swing arm. In other embodiments, the limiting seat can not be provided, and the swing arm can be rotationally connected with the base at the rear end.

[0011] In an embodiment, a rotating seat is inserted on the left and right sides of the base respectively, the rotating seat is rotationally connected with the base, and the two side arms of the swing arm are fixed on the rotating seat of the corresponding side respectively.

[0012] In an embodiment, the swing arm assembly includes four swing arms, which are two front arms and two rear arms, and the two front arms are in front of the two rear arms; the front arm has three end parts, which are the upper end, the lower end and the front end respectively, and the "U" shaped recess is provided on the front arm; the rear arm has two end parts, which are the upper end and the lower end respectively; the lower end of the front arm and the lower end of the rear arm are rotationally connected with the base respectively, and the upper end of the front arm and the upper end of the rear arm are used for rotationally connecting with the transverse support respectively; the rebound device is a gas spring, and the two ends of the rebound device are rotationally connected with the two rotating shafts respectively, one end of one rotating shaft is fixed at the front end of the two front arms, and the other end of the other rotating shaft is fixed at the rear end of the left and right sides of the base.

[0013] In an embodiment, the front and back buffering mechanism further comprises a shell and a knob, the shell comprises a left shell and a right shell fixedly connected in a detachable manner, the knob is fixedly connected to the left side or the right side of the swing bracket, the left shell or the right shell is provided with a clearance hole corresponding to the knob, the knob extends out of the shell from the clearance hole, the shell is provided with an arc-shaped double-arrow mark along the circumference of the clearance hole, and the double-arrow mark is provided with an unlocking mark corresponding to an unlocking position and a locking mark corresponding to a locking position at two ends thereof.

[0014] The shell can improve the appearance and prevent the swing arm assembly from pinching hands. In other embodiments, the shell and the knob can be omitted.

[0015] The headrest device comprises a headrest, a transverse support and a longitudinal support, the headrest is installed at the front end of the transverse support, and the transverse support is connected to the longitudinal support through the front and back buffering mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a perspective view of the headrest device according to an embodiment of the present application;

[0017] Figure 2 It is an exploded view of the headrest device shown in Figure 1

[0018] Figure 3-1 It is a perspective view of the headrest device hidden shell rear crossbar in the unlocking position and the locking position, respectively; 3-2 Figure 1

[0019] Figure 4-1 4-2 Figure 3-1 3-2 It is a cross-sectional view of the transverse support hidden behind;

[0020] Figure 5 6 It is an exploded view of the front and back buffering mechanism shown in Figure 1 DETAILED DESCRIPTION OF THE INVENTION

[0021] The present application will be further described below in combination with the drawings and one embodiment of the present application.

[0022] Reference should be made to Figure 1 ​​​​​​​The headrest device comprises a headrest pillow 100, a transverse support 200, a front-rear buffering mechanism 400 and a longitudinal support 300. The headrest pillow 100 is installed on the transverse support 200. The transverse support 200 is connected with the longitudinal support 300 through the front-rear buffering mechanism 400. The front-rear buffering mechanism 400 comprises a base 1, a swing arm assembly, a rebound device 2 and a swing stop 3. The base 1 is fixedly connected with the longitudinal support 300. The swing arm assembly comprises two front arms 4a and two rear arms 4b. The lower ends of the two front arms 4a are respectively pivotally connected to the left side and the right side of the base 1. The upper ends of the two front arms 4a are respectively pivotally connected to the left side and the right side of the transverse support 200. The lower ends of the two rear arms 4b are respectively pivotally connected to the left side and the right side of the base 1. The upper ends of the two rear arms 4b are respectively pivotally connected to the left side and the right side of the transverse support 200. The rear arms 4b are located behind the front arms 4a.

[0023] Referring to Figure 5 A front shaft T and a rear shaft T are arranged on the transverse support 200. Screws S2 are respectively screwed at the two ends of the front shaft T. The screws S2 pass through the front arms 4a on the same side and are screwed into the front shaft T, thereby fixing the front shaft T and the front arms 4a. A sleeve assembly T1 is arranged between the front shaft T and the transverse support 200, thereby achieving the pivotal connection between the front arms 4a and the transverse support 200. Screws S3 are respectively screwed at the two ends of the rear shaft T. The screws S3 pass through the rear arms 4b on the same side and are screwed into the rear shaft T, thereby fixing the rear shaft T and the rear arms 4b. A sleeve assembly T1 is arranged between the rear shaft T and the transverse support 200, thereby achieving the pivotal connection between the rear arms 4b and the transverse support 200.

[0024] Referring to Figure 6 The two front arms 4a are sleeved on the front shaft 11. The two rear arms 4b are sleeved on the rear shaft 12. Screws S4 are respectively arranged at the two ends of the front shaft 11 and fixed on the base 1. Screws S4 are respectively arranged at the two ends of the rear shaft 12 and fixed on the base 1. A sleeve assembly 111 is arranged between the front shaft 11 and the front arms 4a, thereby achieving the pivotal connection between the front arms 4a and the base 1 and the fixing of the relative positions of the two front arms 4a. A sleeve assembly 121 is arranged between the rear shaft 12 and the rear arms 4b, thereby achieving the pivotal connection between the rear arms 4b and the base 1 and the fixing of the relative positions of the two rear arms 4b.

[0025] The rebound device 2 connects the base 1 and the two front arms 4a, the rear end of the rebound device 2 is rotatably connected to the two sides of the base 1, and the front end of the rebound device 2 is rotatably connected to the two front arms 4a. When the headrest 100 is subjected to a rearward force, the transverse support 200 moves rearward, causing the upper ends of the front arms 4a and the rear arms 4b to move rearward, and the front arms 4a and the rear arms 4b to tilt rearward; when the rearward force on the headrest 100 disappears, the rebound device 2 pushes the front arms 4a to reset, and the upper ends of the front arms 4a and the rear arms 4b move forward, causing the transverse support 200 and the headrest 100 to move forward to reset.

[0026] Referring to Figure 6 , the rebound device 2 is a gas spring, and the front and rear ends are respectively sleeved on the two rotating shafts E1 and E2, the two ends of the rotating shaft E1 are respectively fixed on the two front arms 4a through the screws S5, and the two ends of the rotating shaft E2 are respectively fixed on the left and right sides of the base 1 through the screws S6. By providing sleeves on the rotating shafts E1 and E2, the rebound device 2 is limited to the middle position of the rotating shafts E1 and E2. Since the front and rear ends of the rebound device 2 are respectively rotatably connected to the rotating shafts E1 and E2, the rear end of the rebound device 2 is rotatably connected to the two sides of the base 1, and the front end of the rebound device 2 is rotatably connected to the two front arms 4a.

[0027] The anti-swing bracket 3 includes two side arms 31 and a crossbar 32, the two side arms 31 are respectively rotatably connected to the left and right sides of the base 1, and the left and right ends of the crossbar 32 are respectively connected to the front ends of the two side arms 31 through the screws S7. The front side of the front arm 4a is provided with an arc-shaped recess P1 and a "U"-shaped recess P2 corresponding to the crossbar 32, referring to Figure 3-1 and 4-1 When the anti-swing bracket 3 rotates in the unlocking direction, the crossbar 32 moves upward until it is clamped into the arc-shaped recess P1, and when the crossbar 32 is located in the arc-shaped recess P1, it is blocked by the crossbar 32, so that the upper end of the front arm 4a cannot move forward from the initial position (the upper end of the front arm 4a is located in the initial position in each figure), but the crossbar 32 has no limiting effect on the rearward movement of the upper end of the front arm 4a, so that the headrest 100 can move rearward when it is subjected to a rearward force, and the rebound device 2 can move the headrest 100 forward to reset when the rearward force on the headrest 100 disappears.

[0028] Referring to Figure 3-2 and 4-2 When the anti-swing bracket 3 rotates in the locking direction, the crossbar 32 moves downward until it is clamped into the "U"-shaped recess P2, and when the crossbar 32 is located in the "U"-shaped recess P2, it is blocked by the crossbar 32, so that the upper end of the front arm 4a cannot move forward or rearward, that is, the crossbar 32 prevents the front arm 4a from swinging, and the headrest 100 cannot move rearward when it is subjected to a rearward force. Referring to Figure 4-2The “U”-shaped recess P2 is a “U”-shaped structure with an upward opening and a depth greater than the diameter of the crossbar 32 , so that the front and rear side walls of the “U”-shaped recess P2 can effectively block the crossbar 32 .

[0029] exist Figure 3-1 and 4-1 In the embodiment, the cross bar 32 is in the unlocked position and is limited by the arc-shaped recess P1 and cannot move upwards. The headrest 100 can move backwards after receiving a backward force. However, when the cross bar 32 is in other positions outside the "U"-shaped recess P2, the headrest 100 can also move backwards after receiving a backward force. Figure 3-2 and 4-2 In the embodiment, the cross bar 32 is located in the locked position and is limited by the "U"-shaped recess P2 and cannot move further downward. The headrest 100 cannot move backward after receiving the backward force. However, when the cross bar 32 is located at other positions in the "U"-shaped recess P2, the headrest 100 cannot move backward after receiving the backward force.

[0030] See also Figure 6 A rotating base B is inserted on each of the left and right sides of the base 1. The rotating base B is rotatably connected to the base 1. Screws S8 pass through the corresponding side arms 31 and are screwed into the corresponding rotating base B to achieve fixation between the side arms 31 and the corresponding rotating base B. Since the rotating base B is rotatably connected to the base 1, the anti-sway frame 3 is rotatably connected to the base 1.

[0031] See also Figure 3-1 and 3-2 In order to improve durability and stability, two limit seats 13 are provided on both sides of the base 1, one in front and one in the back. Figure 3-1 When the crossbar 32 is located in the arc-shaped recess P1, the two rear limit seats 13 limit the rear end of the anti-sway frame 3 to prevent the anti-sway frame 3 from continuing to rotate; see Figure 3-2 When the cross bar 32 is located in the "U"-shaped recess P2, the two front limit seats 13 limit the front end of the anti-sway frame 3 to prevent the anti-sway frame 3 from continuing to rotate.

[0032] See also Figure 1 and 2 The front and rear buffer mechanism 400 further includes a housing 5 and a knob 51. The housing 5 is assembled from two left and right shells. The knob 51 is fixed to the left side of the left side arm 31 by three screws S1 (see Figure 5), a clearance hole 50 is formed on the left lobe of the shell 5 corresponding to the knob 51, the knob 51 is exposed from the clearance hole 50, a double arrow mark is arranged beside the knob 51 on the outside of the left lobe of the shell 5, an unlocking mark X and a locking mark Y are respectively arranged at the two ends of the double arrow mark, the knob 51 is rotated by a certain angle in the direction of the unlocking mark X (i.e. in the unlocking direction) to enable the horizontal rod 32 to be clamped into the arc-shaped recess P1, and the knob 51 is rotated by a certain angle in the direction of the locking mark Y (i.e. in the locking direction) to enable the horizontal rod 32 to be clamped into the "U"-shaped recess P2.

Claims

1. A front and back buffering mechanism of a headrest, comprising a swing arm assembly, a rebound device (2) and a base (1), the swing arm assembly comprises a plurality of swing arms, the lower end and the upper end of the swing arms are respectively used for being rotatably connected with the base (1) and a transverse support (200) of the headrest, the swing arms swing to realize the front and back movement of the transverse support (200) relative to the base (1), the two ends of the rebound device (2) are respectively rotatably connected with the base (1) and the swing arm assembly, and the rebound device (2) is used for realizing the reset of the swing arms, characterized in that: the front and back buffering mechanism further comprises a swing stop frame (3), the swing stop frame (3) comprises a horizontal rod (32), the swing stop frame (3) is rotatably connected with the base (1), so that the horizontal rod (32) can change the position up and down relative to the base (1) between an unlocking position and a locking position, a plurality of swing arms of the swing arm assembly are provided with a "U"-shaped recess (P2) used for cooperating with the horizontal rod (32), and the two side walls of the "U"-shaped recess (P2) are arranged in the front and back direction; when the horizontal rod (32) is located at the locking position, the horizontal rod (32) is located in the "U"-shaped recess (P2), and the two side walls of the "U"-shaped recess (P2) prevent the corresponding swing arm from swinging, so as to prevent the transverse support (200) from moving forward and backward relative to the base (1); when the horizontal rod (32) is located at the unlocking position, the horizontal rod (32) is located outside the "U"-shaped recess (P2), and the swing arm can swing. The swing arm provided with the "U"-shaped recess (P2) is further provided with an arc-shaped recess (P1), when the horizontal rod (32) is located at the unlocking position, the horizontal rod (32) is located in the arc-shaped recess (P1), the arc-shaped recess (P1) is matched with the horizontal rod (32), so that the arc-shaped recess (P1) and the horizontal rod (32) are in surface contact; and the arc-shaped recess (P1) is located above the "U"-shaped recess (P2).

2. The front and rear cushioning mechanism of claim 1, wherein: The swing stop frame (3) further comprises a left side arm (31) and a right side arm (31), the two ends of the horizontal rod (32) are respectively fixed on the front ends of the two side arms (31), and the swing stop frame (3) with a "U"-shaped structure is formed; the middle part of the side arm (31) is rotatably connected with the base (1), the base (1) is provided with a limiting seat (13) corresponding to the front end and the rear end of the side arm (31), the limiting seat (13) corresponding to the front end of the side arm (31) is used for limiting the front end of the side arm (31) when the horizontal rod (32) is located at the locking position, and the limiting seat (13) corresponding to the rear end of the side arm (31) is used for limiting the rear end of the side arm (31) when the horizontal rod (32) is located at the unlocking position.

3. The front and rear cushioning mechanism according to claim 1 or 2, characterized in that: The base (1) is respectively provided with a rotating seat (B) on the left side and the right side, the rotating seat (B) is rotatably connected with the base (1), and the two side arms (31) of the swing stop frame (3) are respectively fixed on the rotating seat (B) of the corresponding side.

4. The front and rear cushioning mechanism of claim 3, wherein: ​ 5. The front and rear cushioning mechanism of claim 1, wherein: The swing arm assembly comprises four swing arms, two front arms (4a) and two rear arms (4b), the two front arms (4a) being in front of the two rear arms (4b); the front arm (4a) has three ends, namely its upper end, lower end and front end, and a "U"-shaped recess (P2) is arranged on the front arm (4a); the rear arm (4b) has two ends, namely its upper end and lower end; the lower end of the front arm (4a) and the lower end of the rear arm (4b) are respectively rotationally connected with the base (1), and the upper end of the front arm (4a) and the upper end of the rear arm (4b) are respectively used for rotationally connecting with the transverse support (200); the rebound device (2) is a gas spring, two ends of the rebound device (2) are respectively rotationally connected with two rotating shafts (E1, E2), one rotating shaft (E1) has two ends fixed on the front ends of the two front arms (4a), and the other rotating shaft (E2) has two ends fixed on the left and right sides of the rear end of the base (1).

6. The front and rear cushioning mechanism of claim 1, wherein: The front-rear buffer mechanism further comprises a shell (5) and a knob (51), the shell (5) comprises a left shell and a right shell fixed in a detachable manner, the knob (51) is fixedly connected with the left side or the right side of the swing stop frame (3), the left shell or the right shell is correspondingly provided with a clearance hole (50) for the knob (51), the knob (51) extends out of the shell (5) from the clearance hole (50), the shell (5) is provided with an arc-shaped double-arrow mark along the circumference of the clearance hole (50), and the two ends of the double-arrow mark are respectively provided with an unlocking mark (X) corresponding to an unlocking position and a locking mark (Y) corresponding to a locking position.

7. A headrest device comprising a headrest pillow (100), a transverse support (200) and a longitudinal support (300), the headrest pillow (100) being mounted at the front end of the transverse support (200), characterized in that: The transverse support (200) is connected with the longitudinal support (300) through the front-rear buffer mechanism (400) as claimed in any one of claims 1 to 6.

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