Seat headrest front-back adjusting mechanism

Abstract

The utility model belongs to the field of office furniture, and discloses a seat headrest front-back adjusting mechanism which comprises a base connected with a seat back installation mechanism and a movable seat in front-back sliding fit with the base, a locking piece and an elastic piece are arranged on the base, the locking piece is movably matched with the base, the movable seat is used for installing a headrest assembly, and the elastic piece is arranged on the movable seat. A gear groove structure is arranged on the movable seat, the locking piece is matched with the gear groove structure in a locking mode, and the elastic piece presses the locking piece. The front-and-back adjusting mechanism is provided with the base, the movable seat, the locking piece, the elastic piece and the like, front-and-back adjustment of the headrest can be achieved, the locking and unlocking functions are achieved, and operation is convenient.

Description

Technical Field

[0001] This utility model relates to the field of office furniture, specifically a seat headrest front-to-back adjustment mechanism. Background Technology

[0002] Many office chairs are equipped with headrests, but these headrests usually only allow for rotation adjustment and lack forward and backward adjustment.

[0003] Based on the above problems, the applicant proposes a seat headrest fore-and-aft adjustment mechanism. Utility Model Content

[0004] The purpose of this invention is to provide a seat headrest front-to-back adjustment mechanism to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A seat headrest front-to-back adjustment mechanism includes a base connected to a seat back mounting mechanism and a movable seat that slides back and forth with the base. The base is provided with a locking member and an elastic member. The locking member is movably engaged with the base. The movable seat is used to install a headrest assembly. The movable seat is provided with a shift groove structure. The locking member is locked into the shift groove structure. The elastic member presses against the locking member.

[0007] Furthermore, the movable seat is tilt-rotatably connected to the headrest assembly, and the base is tilt-rotatably connected to the chair back mounting mechanism.

[0008] Furthermore, the backrest mounting mechanism includes a support frame connected to the front and rear adjustment mechanism and a backrest mounting component disposed on the support frame. The backrest mounting component is used to connect to the backrest, and its height position on the support frame can be adjusted.

[0009] Furthermore, the locking member is provided with a locking pin, and the main body of the gear slot structure is a long strip-shaped slot structure arranged in the front-back direction, with several inclined slots arranged in the front-back direction. The opening of the inclined slot is arranged facing backward, and the locking pin is inserted into the inclined slot to achieve locking. The elastic member presses the locking pin into the inclined slot through elastic force. When the movable seat slides forward on the base, the locking pin can be withdrawn from the previous inclined slot and inserted into the next inclined slot under the action of the elastic member.

[0010] Furthermore, the locking member is rotatably connected to the base. The locking member is provided with an abutment part and a limiting pin coaxial with the locking pin. The rear side of the movable seat is provided with an unlocking guide surface. The elastic member is a spring sheet structure, which includes an elastic member pressing part and an elastic member blocking part. The elastic member pressing part is closer to the inclined groove than the elastic member blocking part. The elastic member pressing part presses the locking pin into the inclined groove with elastic force. When the movable seat slides forward to the bottom on the base, the abutment part of the locking member abuts against the unlocking guide surface. The unlocking guide surface guides the locking member to move in the direction that makes the locking pin disengage from the inclined groove, so that the locking pin disengages from the inclined groove, the limiting pin disengages from the elastic member pressing part, and the limiting pin abuts against the elastic member blocking part, thereby unlocking. The elastic member blocking part prevents the locking pin from returning to the inclined groove by cooperating with the limiting pin.

[0011] Furthermore, a locking guide surface is provided on the front side of the gear slot structure. When the movable seat slides backward to the bottom on the base after unlocking, the limiting pin abuts against the locking guide surface. The locking guide surface guides the limiting pin to rotate toward the inclined groove and inserts the locking pin into the inclined groove. At the same time, the limiting pin passes over the elastic element blocking part and connects with the elastic element pressing part.

[0012] Furthermore, the base is provided with an arc-shaped limiting groove, and the locking member is provided with a limiting pin coaxial with the locking pin. The limiting pin slides with the limiting groove to limit the rotation range of the locking member.

[0013] Furthermore, the base is provided with an installation groove, which is connected vertically to the limiting groove. The elastic element is embedded in the installation groove, and the limiting pin extends into the installation groove and connects with the elastic element.

[0014] Furthermore, the base is provided with a base mounting cavity, the movable seat is provided with a movable seat mounting cavity, the base passes through the movable seat mounting cavity, and the movable seat passes through the base mounting cavity.

[0015] Furthermore, the movable seat includes an upper cover plate and a bottom plate that are detachably connected, forming a movable seat mounting cavity between them, with the bottom plate passing through the base mounting cavity.

[0016] Compared with the prior art, the beneficial effects of this utility model are: the front and rear adjustment mechanism of this utility model is provided with a base, a movable seat, a locking element, an elastic element and other structures, which can realize the front and rear adjustment of the headrest, and has locking and unlocking functions, making it easy to operate. Attached Figure Description

[0017] Figure 1 This is one of the structural schematic diagrams of this utility model.

[0018] Figure 2 This is the second schematic diagram of the structure of this utility model.

[0019] Figure 3This is a schematic diagram of the longitudinal cross-sectional structure of this utility model.

[0020] Figure 4 This is an exploded structural diagram of the present invention.

[0021] Figure 5 This is one of the schematic diagrams of the base structure in this utility model.

[0022] Figure 6 This is the second schematic diagram of the base structure in this utility model.

[0023] Figure 7 This is a schematic diagram of the connection structure of the base, locking element, elastic element, and bottom plate in this utility model.

[0024] Figure 8 This is a schematic diagram of the connection structure of the locking component, elastic component, and base plate in this utility model.

[0025] Figure 9 This is one of the schematic diagrams of the bottom plate structure in this utility model.

[0026] Figure 10 This is the second schematic diagram of the bottom plate structure of this utility model.

[0027] Figure 11 This is a schematic diagram of the upper cover plate structure in this utility model.

[0028] Figure 12 This is a schematic diagram of the locking component in this utility model.

[0029] Figure 13 This is a schematic diagram of the elastic element structure in this utility model.

[0030] Figure 14 This is a schematic diagram of the structure of this utility model in use.

[0031] In the diagram: Base 1, Limiting groove 100, Mounting groove 101, Base mounting cavity 102, Top cover 2, Locking component 3, Locking pin 300, Contact part 301, Limiting pin 302, Swinging part 303, Elastic component 4, Elastic component pressing part 400, Elastic component blocking part 401, Base plate 5, Gear slot structure 500, Inclined groove 501, Unlocking guide surface 502, Locking guide surface 503, Movable seat mounting cavity 6, Headrest assembly 7, Support frame 8, Backrest mounting component 9. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Please see Figures 1-14 A seat headrest front-to-back adjustment mechanism includes a base 1 and a movable seat that slides in front-to-back with the base 1. A locking member 3 and an elastic member 4 are provided on the base 1. The locking member 3 is movably engaged with the base 1. The movable seat is used to install a headrest assembly 7. A gear slot structure 500 is provided on the movable seat. The locking member 3 is locked in place with the gear slot structure 500. The elastic member 4 presses the locking member 3.

[0034] Continue reading Figures 1-11 In one embodiment of this utility model, the movable seat includes an upper cover plate 2 and a bottom plate 5 connected vertically by fasteners, forming a movable seat mounting cavity 6 between them. A base 1 is provided with a base mounting cavity 102 that extends through the front and rear, with the base 1 passing through the movable seat mounting cavity 6 and the bottom plate 5 passing through the base mounting cavity 102. The upper cover plate 2 is located at the upper end of the base 1. A stop groove structure 500 is provided on the upper surface of the bottom plate 5.

[0035] Continue reading Figures 7-13 In one embodiment of this utility model, the locking member 3 includes an L-shaped swing portion 303 and an abutment portion 301. The connection between the swing portion 303 and the abutment portion 301 is vertically rotatably connected to the base 1. The abutment portion 301 is positioned to the right relative to the rotation center of the locking member 3. The length of the swing portion 303 is greater than the length of the abutment portion 301, and the swing portion 303 faces forward while the abutment portion 301 faces backward. A locking pin 300 is provided on the lower surface of the swing portion 303, and a limiting pin 302 is provided on the upper surface. The locking pin 300 and the limiting pin 302 are coaxially arranged, and the locking pin 300 and the limiting pin 302 can be regarded as a single unit. The main body of the gear slot structure 500 is a long strip-shaped slot structure arranged in the front-back direction. Several inclined slots 501 are arranged at intervals along the front-back direction. The opening of the inclined slot 501 is set to the rear. The locking pin 300 is inserted into the inclined slot 501 to lock. The elastic element 4 presses the locking pin 300 into the inclined slot 501 by elastic force. When the movable seat slides forward on the base 1, the locking pin 300 can be removed from the previous inclined slot 501 and inserted into the next inclined slot 501 under the action of the elastic element 4, thereby realizing the forward adjustment of the headrest.

[0036] Continue reading Figures 7-13In one embodiment of this utility model, the rear side of the base plate 5 is provided with an unlocking guide surface 502 that slopes from the right front to the left rear. The unlocking guide surface 502 is preferably an inclined surface, but it can also be a curved surface. The elastic element 4 is a spring sheet structure, which includes an elastic element pressing part 400 and an elastic element blocking part 401. The elastic element pressing part 400 and the elastic element blocking part 401 are bent and connected. The elastic element pressing part 400 is relatively straight in the left-right direction, while the elastic element blocking part 401 is inclined to the left front relative to the elastic element pressing part 400. The elastic element pressing part 400 is closer to the inclined groove 501 than the elastic element blocking part 401. The elastic pressing part 400 presses the locking pin 300 into the inclined groove 501 by elastic force. When the movable seat slides forward to the bottom on the base 1, the abutting part 301 of the locking member 3 abuts against the unlocking guide surface 502. The unlocking guide surface 502 guides the locking member 3 to rotate in the direction that makes the locking pin 300 disengage from the inclined groove 501, so that the locking pin 300 disengages from the inclined groove 501, the limiting pin 302 disengages from the elastic pressing part 400, and the locking pin 300 abuts against the elastic blocking part 401, thus unlocking. At this time, the locking pin 300 is prevented from returning to the inclined groove 501 by the cooperation of the elastic blocking part 401 and the limiting pin 302.

[0037] Continue reading Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 12 In one embodiment of this utility model, a locking guide surface 503 inclined from the left rear to the right front is provided on the front side of the gear slot structure 500. The locking guide surface 503 is located on the left side of the inclined groove 501. The locking guide surface 503 is preferably an inclined surface, but it can also be a curved surface. When the movable seat slides backward to the bottom on the base 1 after unlocking, the limiting pin 302 abuts against the locking guide surface 503. The locking guide surface 503 guides the limiting pin 302 to rotate toward the inclined groove 501, so that the locking pin 300 is inserted into the inclined groove 501, thereby locking again.

[0038] Continue reading Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 12 In one embodiment of this utility model, a limiting groove 100 is provided at the upper end of the base mounting cavity 102 of the base 1. The limiting groove 100 is an arc-shaped groove structure that matches the arc trajectory of the moving limiting pin 302. The limiting pin 302 slides into the limiting groove 100. The limiting groove 100 restricts the rotation range of the locking member 3 so that the limiting pin 302 will not be disengaged from the control of the elastic member 4.

[0039] Continue reading Figure 6 and Figure 7In one embodiment of the present invention, the base 1 is provided with an installation groove 101 at the upper end of the base mounting cavity 102. The installation groove 101 is connected to the limiting groove 100 vertically. The elastic member 4 is embedded in the installation groove 101, and the limiting pin 302 extends into the installation groove 101 and is connected to the elastic member 4.

[0040] In use, the base 1 of this utility model is rotatably mounted on the support frame 8, the support frame 8 is mounted on the backrest through the backrest mounting piece 9, and the headrest assembly 7 is mounted on the front end of the upper cover plate 2 of this utility model.

[0041] The operation for adjusting the front and back position of the headrest in this invention is as follows:

[0042] Under normal circumstances, the locking element 3 is inserted into the inclined groove 501 under the action of the elastic element 4, thus achieving locking. Since the opening of the inclined groove 501 is inclined to the left and rear, the movable seat can move forward relative to the base 1, but cannot move backward. When the movable seat moves forward, the locking pin 300 first disengages from the previous inclined groove 501 (when the locking pin 300 disengages from the inclined groove 501, the limiting pin 302 does not disengage from the elastic element pressing part 400), and then, under the elastic force of the elastic element pressing part 400, it inserts into the next inclined groove 501, thereby realizing the step-by-step adjustment of the headrest forward. When the movable seat slides forward to the bottom on the base 1, the contact part 301 of the locking member 3 abuts against the unlocking guide surface 502. As the movable seat moves forward, the unlocking guide surface 502 guides the locking member 3 to rotate in the direction that causes the locking pin 300 to disengage from the inclined groove 501, causing the locking pin 300 to disengage from the inclined groove 501, causing the limiting pin 302 to disengage from the elastic member pressing part 400, and causing the locking pin 300 to abut against the elastic member blocking part 401, thereby unlocking. At this time, the present invention prevents the locking pin 300 from returning to the inclined groove 501 through the cooperation of the elastic member blocking part 401 and the limiting pin 302. Next, slide the movable seat backward on the base 1 to the bottom. At this time, the limit pin 302 abuts against the locking guide surface 503. When the movable seat moves backward, the locking guide surface 503 guides the limit pin 302 to rotate toward the inclined groove 501 and inserts the locking pin 300 into the inclined groove 501. At the same time, the limit pin 302 passes over the elastic member blocking part 401 and connects with the elastic member pressing part 400. The elastic member pressing part 400 presses the locking pin 300 into the inclined groove 501 again. At this time, the front and rear adjustment mechanism is locked again.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A seat headrest fore-and-aft adjustment mechanism, characterized in that, Includes a base (1) and a movable seat that slides back and forth with the base (1). The base (1) is provided with a locking member (3) and an elastic member (4). The locking member (3) is movably engaged with the base (1). The movable seat is provided with a gear slot structure (500). The movable seat is used to install a headrest assembly. The locking member (3) is locked in place with the gear slot structure (500). The elastic member (4) presses against the locking member (3). The locking member (3) is provided with a locking pin (300). The main body of the gear slot structure (500) is a long strip-shaped slot structure arranged in the front-back direction. Several inclined slots (501) are arranged in the front-back direction. The slot opening of the inclined slot (501) is arranged facing backward. The locking pin (300) is inserted into the inclined slot (501) to achieve locking. The elastic member (4) presses the locking pin (300) into the inclined slot (501) by elastic force. When the movable seat slides forward on the base (1), the locking pin (300) can exit from the previous inclined slot (501) and insert into the next inclined slot (501) under the action of the elastic member (4). The locking member (3) is rotatably connected to the base (1). The locking member (3) is provided with an abutment part (301) and a limiting pin (302) coaxial with the locking pin (300). The rear side of the movable seat is provided with an unlocking guide surface (502). The elastic member (4) is a spring sheet structure, which includes an elastic member pressing part (400) and an elastic member blocking part (401). The elastic member pressing part (400) is closer to the inclined groove (501) than the elastic member blocking part (401). The elastic member pressing part (400) presses the locking pin (300) into the inclined groove (501) by elastic force. The movable seat is on the base. (1) When the upper part slides forward to the bottom, the contact part (301) of the locking member (3) abuts against the unlocking guide surface (502). The unlocking guide surface (502) guides the locking member (3) to move in the direction that makes the locking pin (300) disengage from the inclined groove (501), so that the locking pin (300) disengages from the inclined groove (501), the limiting pin (302) disengages from the elastic member pressing part (400), and the limiting pin (302) abuts against the elastic member blocking part (401) to achieve unlocking. The elastic member blocking part (401) prevents the locking pin (300) from returning to the inclined groove (501) through the cooperation with the limiting pin (302).

2. The seat headrest fore-and-aft adjustment mechanism according to claim 1, characterized in that, The front side of the gear slot structure (500) is provided with a locking guide surface (503). When the movable seat is unlocked and slides backward to the bottom on the base (1), the limiting pin (302) abuts against the locking guide surface (503). The locking guide surface (503) guides the limiting pin (302) to rotate toward the inclined groove (501) and inserts the locking pin (300) into the inclined groove (501). At the same time, the limiting pin (302) passes over the elastic member blocking part (401) and connects with the elastic member pressing part (400).

3. The seat headrest fore-and-aft adjustment mechanism according to claim 1, characterized in that, The base (1) is provided with an arc-shaped limiting groove (100), and the limiting pin (302) slides in cooperation with the limiting groove (100) to limit the rotation range of the locking member (3).

4. The seat headrest fore-and-aft adjustment mechanism according to claim 3, characterized in that, The base (1) is provided with an installation groove (101), the installation groove (101) is connected to the limiting groove (100) vertically, the elastic element (4) is embedded in the installation groove (101), and the limiting pin (302) extends into the installation groove (101) and is connected to the elastic element (4).

5. The seat headrest fore-and-aft adjustment mechanism according to claim 1, characterized in that, The base (1) is provided with a base mounting cavity (102), and the movable seat is provided with a movable seat mounting cavity (6). The base (1) passes through the movable seat mounting cavity (6), and the movable seat passes through the base mounting cavity (102).

6. The seat headrest fore-and-aft adjustment mechanism according to claim 5, characterized in that, The movable seat includes an upper cover plate (2) and a bottom plate (5) that are detachably connected, forming a movable seat mounting cavity (6) between them, and the bottom plate (5) passes through the base mounting cavity (102).

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