Sliding structure and chair headrest

Abstract

A sliding structure comprises a sliding self-locking unit and a supporting seat unit, the sliding self-locking unit comprises a sliding seat, a locking tongue and an elastic piece, the supporting seat unit comprises a seat body and a plurality of locking positions, and the locking tongue always tends to move towards the side of the locking positions under the action of the elastic piece. The sliding self-locking unit further comprises a limiting protrusion arranged on the surface of the locking tongue. The supporting base unit further comprises a groove formed in the base body, a blocking strip arranged on the inner bottom face of the groove and dividing the groove into a first channel and a second channel and an unlocking position arranged on the groove wall of the groove. The first channel and the second channel are communicated end to end, and when the limiting protrusion makes contact with the unlocking position, the limiting protrusion is forced to enter the second channel from the first channel. Through the arrangement of the sliding self-locking unit and the supporting seat unit, the structure has the function of adjusting the distance in a multi-stage mode, the adjusting mode is simple and rapid, the adjusting process is smooth and not jammed, and the structure has the advantages of being high in practicability and good in use experience.

Description

Technical Field

[0001] The utility model belongs to the technical field of seating, and in particular relates to a sliding structure and a chair headrest. Background Art

[0002] Part of the existing seat with headrest is not adjustable, and the rest is basically tightened by only one rotating screw. Not only is the operation of twisting the rotating screw cumbersome, but the rotating screw may slip and loosen after being used for a long time, resulting in the headrest bracket not being able to stay in the set position for a long time, causing inconvenience to the user. At the same time, once the rotating screw slips and loosens during use, the headrest will suddenly lose support for the head, posing a safety hazard.

[0003] The document with the authorization announcement number CN219069800U discloses a chair headrest, which has a tilting sliding adjustment locking assembly including a fixed locking member and a sliding locking member, wherein the fixed locking member is movably connected with a locking tongue, and the sliding locking member is provided with a plurality of locking positions and an unlocking position. The fixed locking member is also provided with a spring elastically abutting against the locking tongue. The fixed locking member is also provided with a locking tongue unlocking position, and when the locking tongue contacts the unlocking position, the locking tongue is forced to completely disengage from the locking position and the locking tongue is finally stuck in the unlocking position.

[0004] However, the device still has the following problems: under the unstable force of the spring, the unlocking position of the lock tongue still has a corner, so the locking tongue is easily stuck in the unlocking position of the lock tongue, resulting in a jamming phenomenon, thereby causing the problem of unsmooth adjustment. Utility Model Content

[0005] In view of the above-mentioned problems, one of the purposes of the utility model is to provide a sliding structure. Through the arrangement of a sliding self-locking unit and a support seat unit, the structure not only has the function of multi-stage distance adjustment, but also the adjustment method is simple and fast, and the adjustment process is smooth and not stuck. It has the advantages of strong practicality and good user experience.

[0006] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0007] The locking tongue is engaged with the locking cam and is adapted to move toward the locking cam side when the locking cam is engaged with the locking cam.

[0008] As a further preferred embodiment of the present invention, the limiting protrusion moves alternately in the first channel and the second channel; the support seat unit also includes an elastic limiting portion arranged on the end of the gear bar close to the unlocking position and used to prevent the limiting protrusion from retreating from the second channel to the first channel.

[0009] As a further preferred embodiment of the present invention, the limiting protrusion causes the elastic limiting portion to deform by squeezing the elastic limiting portion, so that the limiting protrusion enters the second channel from the first channel through the elastic limiting portion.

[0010] As a further preferred embodiment of the present invention, a groove is provided on the inner bottom surface of the groove, which is located at the lower end of the elastic limiting portion and allows the elastic limiting portion to enter.

[0011] As a further preferred embodiment of the present invention, the elastic limiting portion includes an elastic plate which is arranged on the end of the stop bar and has a deformation space between the plate and the inner bottom surface of the groove.

[0012] As a further preferred embodiment of the present invention, the maximum distance between the elastic limiting portion and the groove is smaller than the diameter of the limiting protrusion.

[0013] As a further preferred embodiment of the present invention, the support seat unit further includes a guiding inclined surface provided on the end of the elastic limiting portion and matching the unlocking position.

[0014] As a further preferred embodiment of the present invention, the support seat unit further includes a guide groove provided on the seat body, and the sliding self-locking unit further includes a limiting column provided on the sliding seat and slidably connected to the guide groove.

[0015] As a further preferred embodiment of the present invention, the sliding self-locking unit further includes a supporting inclined surface arranged on the sliding seat and used for mounting the elastic member.

[0016] As a further preferred embodiment of the present invention, the end of the locking tongue has a locking protrusion matching any one of the locking positions.

[0017] The second purpose of the utility model is to provide a chair headrest with the above sliding structure.

[0018] Compared with the prior art, the beneficial effects of the utility model include:

[0019] Through the setting of the sliding self-locking unit and the support seat unit, the structure not only has the function of multi-stage distance adjustment, but also the adjustment method is simple and fast, and the adjustment process is smooth and not stuck. It has the advantages of strong practicality and good user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Attached Figure 1 It is a structural schematic diagram of the utility model.

[0021] Attached Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model.

[0022] Attached Figure 3 It is a structural schematic diagram of the sliding self-locking unit of the utility model when viewed from an upward angle.

[0023] Attached Figure 4 It is a schematic structural diagram of the support base unit of the utility model from a top view.

[0024] Attached Figure 5 It is a partial structural schematic diagram of the elastic limiting part of the utility model.

[0025] Description of the drawings: sliding self-locking unit 1, support base unit 2;

[0026] Sliding seat 101, locking tongue 102, elastic member 103, limiting protrusion 104, limiting column 105, supporting inclined surface 106;

[0027] Locking protrusion 102a, mounting column 102b;

[0028] The seat body 201, the locking position 202, the groove 203, the stop bar 204, the unlocking position 205, the elastic limiting portion 206, the slot 207, and the guide slot 208;

[0029] Elastic plate 206a, guiding slope 206b. DETAILED DESCRIPTION

[0030] In the description of the present utility model, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the utility model product is usually placed when in use, or are directions or positional relationships that are usually understood by those skilled in the art. These directions or positional relationships are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present utility model.

[0031] In addition, the terms "first", "second", etc. are only used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms such as "setting" and "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection: it can be a mechanical connection or an electrical connection: it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Example 1

[0034] The present embodiment provides a sliding structure, including a sliding self-locking unit 1 and a support seat unit 2, the sliding self-locking unit 1 includes a sliding seat 101, a locking tongue 102 movably connected to the sliding seat 101, and an elastic member 103 connected to the locking tongue 102, the support seat unit 2 includes a seat body 201, and a plurality of locking positions 202 arranged on the seat body 201 and located on the moving trajectory of the locking tongue 102, and the locking tongue 102 always has a tendency to move toward the locking position 202 side under the action of the elastic member 103.

[0035] It can be understood that the locking tongue 102 is a locking element commonly used by those skilled in the art, generally having a head, a main body and a tail, and the end of the locking tongue 102 has a locking protrusion 102a matching any one of the locking positions 202, and the end of the locking tongue 102 away from the limiting protrusion 104 is hinged to the sliding seat 101. The shape of the locking position 202 is also a well-known technology in the art, including a locking groove and a guiding bevel provided on the locking groove and guiding the locking protrusion 102a to escape from the locking groove. The elastic member 103 can be a spring or a plate with an arc structure. When the elastic member 103 is a spring, its two ends are detachably connected to the locking tongue 102 and the side of the sliding seat 101, and the locking tongue 102 and the side of the sliding seat 101 respectively have mounting columns 102b for mounting the spring; when the elastic member 103 is a plate with an arc structure, the arc plate also has the function of deformation and recovery due to its special shape. The arc plate is preferably fixedly connected to the tail of the locking tongue, and the other end of the plate abuts against the side of the sliding seat 101. The above structure is well known to those skilled in the art, so it will not be described in detail.

[0036] In this embodiment, the sliding self-locking unit 1 also includes a limiting protrusion 104 arranged on the surface of the side of the locking tongue 102 away from the sliding seat 101, and the support seat unit 2 also includes a groove 203 arranged on the seat body 201, a gear bar 204 arranged on the inner bottom surface of the groove 203 and dividing the groove 203 into a first channel close to the locking position 202 and a second channel away from the locking position 202, and an unlocking position 205 arranged on the groove wall of the groove 203 close to the first channel; the first channel and the second channel are connected to each other end to end, and when the limiting protrusion 104 contacts the unlocking position 205, the limiting protrusion 104 is forced to enter the second channel from the first channel, and at the same time the locking tongue 102 disengages from the locking position 202.

[0037] It is worth noting that the groove 203 is only related to the limiting protrusion 104 and does not interfere with the body of the locking tongue 102. When the locking tongue 102 moves to the locking position 202 at the end, the limiting protrusion 104 also reaches the end of the first channel. At this time, when the locking tongue 102 continues to move in the same direction, the locking tongue 102 is separated from the locking position 202, and the limiting protrusion 104 enters the second channel from the end of the first channel under the guidance of the unlocking position 205. After the limiting protrusion 104 enters the second channel, the locking tongue 102 is pulled down, and the limiting protrusion 104 that drops synchronously can only slide in the second channel due to the obstruction of the stop bar 204. The locking tongue 102 is in a state of being completely out of the locking position 202 because the locking tongue 102 is unable to move back into the first channel, thereby maintaining the state that the locking tongue 102 is completely out of the locking position 202; when the locking tongue 102 drives the limiting protrusion 104 to move along the second channel in the opposite motion until it reaches the end of the second channel, the limiting protrusion 104 loses the obstruction of the stop bar 204, and the force generated by the elastic member 103 causes the locking tongue 102 to move toward the locking position 202, and the limiting protrusion 104 then re-enters the first channel, and the locking tongue 102 is re-engaged with the locking position 202. Therefore, the locking tongue 102 realizes multi-level adjustment and reset functions by the limiting protrusion 104 alternately moving in the first channel and the second channel. Furthermore, the unlocking position 205 is an inclined surface set on the side wall of the groove 203, and the inclined surface can guide the limiting protrusion 104 to move more smoothly from the first channel to the second channel. The minimum distance between the stop bar 204 and the inner wall of the groove 203 needs to be greater than the diameter of the limiting protrusion 104 to ensure that the limiting protrusion 104 can conveniently move alternately in the first channel and the second channel.

[0038] As a further preferred embodiment of the present invention, the support seat unit 2 further comprises a guide groove 208 disposed on the seat body 201, and the sliding self-locking unit 1 further comprises a limit column 105 disposed on the sliding seat 101 and slidably connected to the guide groove 208. This arrangement can make the sliding self-locking unit 1 as a whole move along a standardized and smooth trajectory on the support seat unit 2.

[0039] As a further preferred embodiment of the present invention, the sliding self-locking unit 1 further comprises a supporting inclined surface 106 disposed on the sliding seat 101 and used for mounting the elastic member 103. The supporting inclined surface 106 can help correct the direction of the reaction force generated by the compression of the elastic member 103 and keep the reaction force stable, thereby improving the smoothness and stability of the self-locking effect of the device.

[0040] The working principle of the sliding structure provided in this embodiment is as follows:

[0041] When locking: the locking tongue 102, under the action of the elastic member 103, causes the locking protrusion 102a to be stuck in the locking position 202, and moves the sliding seat 101 upward, the locking protrusion 102a disengages from the locking position 202, and the elastic member 103 is further compressed until the locking protrusion 102a moves to the new locking position 202, and the elastic member 103 pushes the locking protrusion 102a to be stuck in the new locking position 202 again.

[0042] When the lock is canceled: move the sliding seat 101 to the uppermost end, the locking tongue disengages from the locking position 202 at the endmost end, and the limiting protrusion 104 enters the second channel from the first channel under the guidance of the unlocking position 205. At this time, the limiting protrusion 104 cannot be reset due to the obstruction of the stop bar 204, and the elastic member 103 cannot push the locking protrusion 102a into the locking position 202.

[0043] When restoring the lock: the sliding seat 101 is moved to the lowermost end, the limiting protrusion 104 loses the obstruction of the stop bar 204, and under the action of the elastic member 103, the limiting protrusion 104 enters the first channel from the second channel. At this time, the locking protrusion 102a is re-locked in the locking position 202.

[0044] Example 2

[0045] This embodiment further optimizes the structure on the basis of the embodiment 1 to reduce the risk that the limiting protrusion 104 is easy to retreat from the second channel to the first channel when the device is unlocked. The specific structure is as follows:

[0046] The support base unit 2 further includes an elastic limiting portion 206 disposed on the end of the stop bar 204 near the unlocking position 205 and used to prevent the limiting protrusion 104 from retreating from the second channel to the first channel. The limiting protrusion 104 deforms the elastic limiting portion 206 by squeezing the elastic limiting portion 206, so that the limiting protrusion 104 enters the second channel from the first channel through the elastic limiting portion 206.

[0047] As a preferred embodiment of the present invention, a slot 207 is provided on the inner bottom surface of the groove 203, which is located at the lower end of the elastic limiting portion 206 and allows the elastic limiting portion 206 to enter. In this case, the elastic limiting portion 206 is a part of the end of the stop bar 204, and the part is located in the slot 207. When the elastic limiting portion 206 is subjected to pressure from the limiting protrusion 104, the elastic limiting portion 206 is deformed and moves into the slot 207, and the limiting protrusion 104 can enter the second channel through the elastic limiting portion; when the limiting protrusion 104 enters the second channel, the elastic limiting portion 206 loses the pressure from the limiting protrusion 104 and returns to its original state. At this time, the height of the elastic limiting portion 206 is equal to that of other parts of the stop bar 204, and the limiting protrusion 104 can no longer return to the first channel.

[0048] As another preferred embodiment of the present invention, the elastic limiting portion 206 includes an elastic plate 206a disposed on the end of the stop bar 204 and having a deformation space between the elastic plate 206a and the inner bottom surface of the groove 203. At this time, the elastic plate 206a is a thin plate connected to the end of the stop bar 204 at one end, and has the ability to deform and restore to its original state. After receiving the pressure of the limiting protrusion 104, the elastic plate 206a deforms and approaches the inner bottom surface of the groove 203, and the limiting protrusion 104 is able to pass through. When the limiting protrusion 104 enters the second channel, the elastic plate 206a loses the pressure from the limiting protrusion 104 and restores to its original state. At this time, the height of the elastic plate 206a is equivalent to that of other parts of the stop bar 204, and the limiting protrusion 104 can no longer return to the first channel.

[0049] In the above two preferred cases, the maximum distance between the elastic limiting portion 206 and the groove 203 is smaller than the diameter of the limiting protrusion 104 , so as to ensure that the limiting protrusion 104 can effectively press down the elastic limiting portion 206 .

[0050] As a further preferred embodiment of the present invention, the support base unit 2 further comprises a guiding inclined surface 206 b arranged on the end of the elastic limiting portion 206 and matching the unlocking position 205 . Such arrangement is used to reduce the wear between the limiting protrusion 104 and the supporting base unit 2 .

[0051] Example 3

[0052] The present application also provides a chair headrest, which includes the sliding structure in Example 1 or Example 2.

[0053] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A sliding structure, comprising a sliding self-locking unit (1) and a support base unit (2), wherein the sliding self-locking unit (1) comprises a sliding base (101), a locking tongue (102) movably connected to the sliding base (101), and an elastic member (103) connected to the locking tongue (102), wherein the support base unit (2) comprises a base body (201), a plurality of locking positions (202) arranged on the base body (201) and located on a moving track of the locking tongue (102), wherein the locking tongue (102) always has a tendency to move toward the locking position (202) under the action of the elastic member (103), and wherein: The sliding self-locking unit (1) further comprises a limiting protrusion (104) arranged on the surface of the locking tongue (102) on the side facing away from the sliding seat (101); the supporting seat unit (2) further comprises a groove (203) arranged on the seat body (201), a stop bar (204) arranged on the inner bottom surface of the groove (203) and dividing the groove (203) into a first channel close to the locking position (202) and a second channel away from the locking position (202); and an unlocking position (205) arranged on the groove wall of the groove (203) close to the first channel; the first channel and the second channel are connected to each other end to end, and when the limiting protrusion (104) contacts the unlocking position (205), the limiting protrusion (104) is forced to enter the second channel from the first channel.

2. A sliding structure according to claim 1, characterized in that: The limiting protrusion (104) moves alternately in the first channel and the second channel; the support seat unit (2) further comprises an elastic limiting portion (206) arranged on the end of the stop bar (204) close to the unlocking position (205) and used to prevent the limiting protrusion (104) from retreating from the second channel to the first channel.

3. A sliding structure according to claim 2, characterized in that: The limiting protrusion (104) causes the elastic limiting portion (206) to deform by squeezing the elastic limiting portion (206), so that the limiting protrusion (104) enters the second channel from the first channel through the elastic limiting portion (206).

4. A sliding structure according to claim 3, characterized in that: The inner bottom surface of the groove (203) is provided with a slot (207) located at the lower end of the elastic limiting portion (206) for the elastic limiting portion (206) to enter.

5. A sliding structure according to claim 3, characterized in that: The elastic limiting portion (206) comprises an elastic plate (206a) which is arranged on the end of the stop bar (204) and has a deformation space between the inner bottom surface of the groove (203).

6. A sliding structure according to any one of claims 4 or 5, characterized in that: The maximum distance between the elastic limiting portion (206) and the groove (203) is smaller than the diameter of the limiting protrusion (104).

7. A sliding structure according to claim 2, characterized in that: The support seat unit (2) further comprises a guiding inclined surface (206b) arranged on the end of the elastic limiting portion (206) and matching the unlocking position (205).

8. A sliding structure according to claim 1, characterized in that: The support seat unit (2) further comprises a guide groove (208) arranged on the seat body (201), and the sliding self-locking unit (1) further comprises a limit column (105) arranged on the sliding seat (101) and slidably connected to the guide groove (208).

9. A sliding structure according to claim 1, characterized in that: The sliding self-locking unit (1) further comprises a supporting inclined surface (106) which is arranged on the sliding seat (101) and is used for mounting the elastic member (103).

10. A chair headrest, characterized in that: It comprises a sliding structure as described in any one of claims 1 to 5 and 7 to 9.

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