Seat back lifting device

Abstract

The utility model belongs to the field of office furniture, and discloses a seat back lifting device, including a back support, a lifting seat, a backrest and a first linear sliding module, the first linear sliding module including a locking strip, a slide groove and a sliding module, the locking strip and the slide groove are vertically arranged on the back support, the sliding module is arranged on the lifting seat, and it can move up and down with the lifting seat, and it includes a mounting part and a locking tongue and an elastic part arranged on the mounting part, the locking tongue is movably connected to the mounting part, and it is used to lock and cooperate with the locking strip, the elastic part presses the locking tongue toward the locking strip, and the slide groove is used to guide the locking tongue to move, so that the locking tongue is unlocked from the locking strip when the sliding module reaches the sliding limit state. The first linear sliding module of the utility model is provided with a locking strip, a slide groove, a sliding module and other structures, which can help the backrest to achieve lifting, unlocking, locking and other actions, and has the advantages of simple structure and convenient operation.

Description

Technical Field

[0001] The utility model relates to the field of office furniture, in particular to a seat back lifting device. Background Art

[0002] Currently, many office chairs have a lifting function for their backrests, but they usually have the following problems:

[0003] 1) The backrest is raised and lowered by a linear sliding mechanism, but the traditional linear sliding mechanism has the problems of complex structure and inconvenient operation;

[0004] 2) The assembly of the backrest and the back support is not convenient enough. Utility Model Content

[0005] The purpose of the utility model is to provide a seat back lifting device to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A seat back lifting device comprises a back support, a lifting seat mounted on the back support for vertical sliding, a backrest arranged on the lifting seat, and a first linear sliding module, wherein the first linear sliding module comprises a locking strip, a sliding groove, and a sliding module, wherein the locking strip and the sliding groove are vertically arranged on the back support, and the sliding module is arranged on the lifting seat and can move up and down with the lifting seat, and comprises a mounting member, a locking tongue and an elastic member arranged on the mounting member, wherein the locking tongue is movably connected to the mounting member and is used for locking and cooperating with the locking strip, the elastic member presses the locking tongue toward the locking strip, and the sliding groove is used for guiding the locking tongue to move so that the locking tongue is unlocked from the locking strip when the sliding module reaches a sliding limit state.

[0008] Furthermore, the backrest is plug-fitted with the lifting seat.

[0009] Furthermore, one of the backrest and the lifting seat is provided with a buckle, and the other is provided with a slot for engaging with the buckle.

[0010] Furthermore, a decorative cover is provided on the rear side of the back support, and the decorative cover is used to cover the first linear sliding module.

[0011] Furthermore, the locking strip is a ratchet strip structure, and the locking tongue has a ratchet portion for engaging with the locking strip.

[0012] Furthermore, the lock tongue has a locking groove and an unlocking groove, and the locking groove is farther away from the ratchet portion than the unlocking groove;

[0013] When the elastic member cooperates with the locking groove, the elastic member puts the lock tongue in a locked state; when the elastic member cooperates with the unlocking groove, the elastic member puts the lock tongue in an unlocked state;

[0014] The sliding groove guides the locking tongue to switch between a state in which the locking groove cooperates with the elastic member and a state in which the unlocking groove cooperates with the elastic member.

[0015] Furthermore, the lock tongue has a lock tongue unlocking portion, and the slide groove has a guide surface, which is used to cooperate with the lock tongue unlocking portion to guide the lock tongue unlocking portion to move in a direction away from the locking strip, thereby driving the lock tongue and the locking strip to unlock.

[0016] Furthermore, the mounting member is provided with a limiting groove, and the limiting groove is slidably matched with the unlocking portion of the lock tongue.

[0017] Furthermore, the locking tongue is rotatably connected to the mounting piece.

[0018] Furthermore, the elastic member is a torsion spring.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] 1) The first linear sliding module of the utility model is provided with a locking strip, a sliding groove, a sliding module and other structures, which can help the backrest to achieve lifting, unlocking, locking and other actions, and has the advantages of simple structure and convenient operation;

[0021] 2) The backrest installation structure of the utility model is simple and easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is one of the schematic diagrams of the structure of the utility model.

[0023] Figure 2 This is the second schematic diagram of the structure of the utility model.

[0024] Figure 3 This is one of the schematic diagrams of the decomposition structure of the utility model.

[0025] Figure 4 This is the second schematic diagram of the decomposition structure of the utility model.

[0026] Figure 5 It is a schematic diagram of the backrest structure in the utility model.

[0027] Figure 6 It is a schematic diagram of the structure of the lifting seat in the utility model.

[0028] Figure 7 It is a schematic diagram of the structure of the first linear sliding module in the utility model.

[0029] Figure 8 It is a schematic diagram of the exploded structure of the first linear sliding module in the utility model.

[0030] Fig. 9It is a partial structural schematic diagram of the first linear sliding module in the utility model.

[0031] Fig.10 It is a schematic diagram of the lock tongue structure in the utility model.

[0032] Fig.11 This is a schematic diagram of the utility model in use state.

[0033] In the figure: back bracket 1, decorative cover 104, pressure plate 105, guide strip 106, backrest 2, card slot 200, plug-in slot 201, lifting seat 4, buckle 400, plug-in strip 401, guide slot 402, locking strip 500, slide slot 501, guide surface 5010, mounting part 502, limiting slot 5020, lock tongue 503, ratchet part 5030, locking slot 5031, unlocking slot 5032, lock tongue unlocking part 5033, lock tongue shaft 5034, elastic part 504. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] See also Figure 1-Figure 11 A seat back lifting device comprises a back support 1, a lifting seat 4 slidably mounted on the back support 1, a backrest 2 arranged on the lifting seat 4 and a first linear sliding module, the first linear sliding module comprises a locking strip 500, a slide groove 501 and a sliding module, the locking strip 500 and the slide groove 501 are vertically fixedly mounted on the back support 1, the sliding module is fixedly mounted on the lifting seat 4, and can move up and down with the lifting seat 4, and comprises a mounting member 502 and a locking tongue 503 and an elastic member 504 arranged on the mounting member 502, the locking tongue 503 is movably connected to the mounting member 502, and is used for locking and cooperating with the locking strip 500, the elastic member 504 presses the locking tongue 503 toward the locking strip 500, and the slide groove 501 is used for guiding the locking tongue 503 to move, so that the locking tongue 503 is unlocked from the locking strip 500 when the sliding module reaches the sliding limit state.

[0036] Continue reading Figure 1-Figure 5In one embodiment of the utility model, two plug-in slots 201 are arranged on the rear side of the lower end of the backrest 2, the opening of the plug-in slot 201 faces downward, and a card slot 200 is arranged on the slot wall of the plug-in slot 201. The lifting seat 4 has two vertically arranged plug strips 401, and a buckle 400 is arranged on the plug strip 401. The plug strip 401 corresponds to the plug-in slot 201 one by one and is plugged in and matched with the corresponding card slot 200. The buckle 400 has an inclined surface, and the inclined surface is used to guide the card into the card slot 200.

[0037] In other embodiments of the utility model, the inserting strip 401 may be provided on the backrest 2 , and the inserting slot 201 may be provided on the lifting seat 4 ; similarly, the buckle 400 may be provided on the inserting slot 201 , and the inserting strip 401 may be provided with the slot 200 .

[0038] Continue reading Figure 1-Figure 4 In one embodiment of the present invention, a decorative cover 104 is provided on the rear side of the back support 1, and the decorative cover 104 covers the first linear sliding module to avoid parts exposure and ensure the beauty of the product.

[0039] Continue reading Figure 3 In one embodiment of the utility model, a plurality of guide bars 106 are vertically arranged on the back support 1, and a plurality of guide grooves 402 are arranged on the lifting seat 4 to slide up and down correspondingly with the guide bars 106. A gap is formed between adjacent guide bars 106 for the lifting seat 4 to pass through. The main body of the lifting seat 4 and the backrest 2 sandwich the guide bars 106 in the middle to limit the lifting seat 4. The rear side of the lifting seat 4 has two pressing plates 105, which are located in front of the decorative cover 104 and fixed to the back support 1 by fasteners, and play a blocking role on the rear side of the lifting seat 4.

[0040] Continue reading Figure 8-Figure 10 In one embodiment of the present invention, the locking bar 500 is a ratchet bar structure, and the locking tongue 503 has a ratchet portion 5030 for engaging with the locking bar 500. The ratchet is an oblique tooth, and when the ratchet bar structure engages with the ratchet portion 5030, the ratchet structure enables the sliding module to move toward the inclined side of the ratchet, but not to move toward the other side.

[0041] Continue reading Figure 7-Figure 8 In one embodiment of the present utility model, the lock tongue 503 has a lock tongue shaft 5034 , and the lock tongue shaft 5034 is rotatably connected to the circular hole on the mounting member 502 .

[0042] Continue reading Figure 7-Figure 8In one embodiment of the utility model, the mounting member 502 is a shell structure, the lock tongue 503 and the elastic member 504 are both arranged inside the mounting member 502, the elastic member 504 is preferably a torsion spring, and the mounting member 502 has a cylinder for mounting the elastic member 504, one end of the elastic member 504 is connected to the lock tongue 503 for squeezing the lock tongue 503.

[0043] Continue reading Figure 9-10 In one embodiment of the utility model, the lock tongue 503 has a locking groove 5031 and an unlocking groove 5032, and the locking groove 5031 and the unlocking groove 5032 are arranged adjacent to each other with a raised triangular slope therebetween. The locking groove 5031 is further away from the ratchet portion 5030 than the unlocking groove 5032.

[0044] When one end of the elastic member 504 is matched with the locking groove 5031, since the locking groove 5031 is far away from the ratchet portion 5030, the elastic member 504 can squeeze the lock tongue 503 toward the locking strip 500 for a greater distance, so that the lock tongue 503 is locked and matched with the locking strip 500. When one end of the elastic member 504 is matched with the unlocking groove 5032, since the unlocking groove 5032 is closer to the ratchet portion 5030, the distance that the elastic member 504 squeezes the lock tongue 503 toward the locking strip 500 is relatively short, and the lock tongue 503 will not be locked with the locking strip 500, that is, the elastic member 504 puts the lock tongue 503 in an unlocked state. The function of the slide groove 501 is to guide the lock tongue 503 to switch between the state in which the locking groove 5031 cooperates with the elastic member 504 and the state in which the unlocking groove 5032 cooperates with the elastic member 504, that is, to enable one end of the elastic member 504 to break through the triangular slope from the locking groove 5031 and enter the unlocking groove 5032, and to enable the elastic member 504 to break through the triangular slope from the unlocking groove 5032 and enter the locking groove 5031.

[0045] Continue reading Figure 7 and Figure 8 In one embodiment of the utility model, a lock tongue 503 has a lock tongue unlocking portion 5033, and the lock tongue unlocking portion 5033 is a convex column structure. The slide groove 501 is an annular structure, and a trapezoidal groove body is formed inside. The inclined surfaces on both sides of the trapezoidal groove body are guide surfaces 5010, and the guide surfaces 5010 are used to cooperate with the lock tongue unlocking portion 5033. When the lock tongue unlocking portion 5033 moves along the guide surfaces 5010, the guide surfaces 5010 guide the lock tongue unlocking portion 5033 to move in a direction away from the locking strip 500, thereby driving the lock tongue 503 to unlock the locking strip 500.

[0046] Continue reading Figure 7 and Figure 8 In one embodiment of the present invention, a limiting groove 5020 is provided on the mounting member 502 , and the limiting groove 5020 is slidably matched with the locking tongue unlocking portion 5033 .

[0047] During installation, the sliding module is pre-installed on the lifting seat 4, the locking strip 500 and the slide groove 501 are pre-installed on the back support 1, the lifting seat 4 is inserted from the rear side of the back support 1, and the main body of the lifting seat 4 is located on the rear side of the guide strip 106. Then, the pressing plate 105 and the decorative cover 104 are installed on the rear side of the back support 1, and then the insertion strip 401 on the front side of the lifting seat 4 is plugged into the backrest 2, and the buckle 400 is engaged with the slot 200, thereby completing the installation.

[0048] The use of the utility model:

[0049] The backrest 2 is installed on the back support 1 through the lifting seat 4, the sliding module is arranged on the lifting seat 4, the locking strip 500 and the slide groove 501 are fixedly arranged on the back support 1, when the first linear sliding module is in the unlocked state, the backrest 2 can be moved up and down, and the sliding module will move therewith, when the first linear sliding module is in the locked state, the backrest 2 can only be moved in the ratchet tilting direction of the locking strip 500, and cannot be moved in the opposite direction, and the ratchet tilting direction is upward, so the backrest 2 can only be lifted, and cannot be lowered, and the upper backrest 2 can be lowered only after unlocking.

[0050] Under normal circumstances, the ratchet portion 5030 of the lock tongue 503 is engaged with the locking strip 500, the first linear sliding module is in a locked state, the elastic member 504 cooperates with the locking groove 5031, and due to the characteristics of the ratchet, the sliding module can slide in the inclined direction of the ratchet of the locking strip 500 (cannot slide in the opposite direction), and when it stops, the elastic member 504 will make the ratchet portion 5030 and the locking strip 500 engage again, and when the sliding module slides to the extreme position, the lock tongue unlocking portion 5033 encounters the guide surface 5010, and under the guidance of the guide surface 5010, the lock tongue unlocking portion 5033 and the lock tongue 503 are The body rotates in the direction away from the locking strip 500, and as the lock tongue 503 rotates, the elastic member 504 breaks through the triangular slope and enters the unlocking groove 5032, thereby completing the unlocking and maintaining the lock tongue 504 in the unlocked state. At this time, the sliding module can be slid in the opposite direction to any position, and the lock tongue unlocking portion 5033 of the lock tongue 503 drives the lock tongue 503 to rotate in the opposite direction under the guidance of the guide surface 5010, so that the elastic member 504 returns from the state of matching with the unlocking groove 5032 to the state of matching with the locking groove 5031. After the sliding module stops, under the action of the elastic member 504, the first linear sliding module is locked again.

[0051] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A seat back lifting device, characterized in that: The invention comprises a back support (1), a lifting seat (4) mounted on the back support (1) in an up-and-down sliding manner, a backrest (2) arranged on the lifting seat (4), and a first linear sliding module, wherein the first linear sliding module comprises a locking bar (500), a sliding groove (501) and a sliding module, wherein the locking bar (500) and the sliding groove (501) are vertically arranged on the back support (1), and the sliding module is arranged on the lifting seat (4) and can move up and down with the lifting seat (4), and comprises a mounting member ( The invention relates to a sliding module comprising a locking member (502) and a locking tongue (503) and an elastic member (504) arranged on the mounting member (502), wherein the locking tongue (503) is movably connected to the mounting member (502) and is used for locking with the locking strip (500), the elastic member (504) presses the locking tongue (503) toward the locking strip (500), and the sliding groove (501) is used for guiding the movement of the locking tongue (503) so that the locking tongue (503) is unlocked from the locking strip (500) when the sliding module reaches a sliding limit state.

2. A seat back lifting device according to claim 1, characterized in that: The backrest (2) is plug-fitted into the lifting seat (4).

3. A seat back lifting device according to claim 2, characterized in that: One of the backrest (2) and the lifting seat (4) is provided with a buckle (400), and the other is provided with a slot (200) for being engaged with the buckle (400).

4. The seat back lifting device according to claim 1, characterized in that: A decorative cover (104) is arranged on the rear side of the back support (1), and the decorative cover (104) is used to cover the first linear sliding module.

5. The seat back lifting device according to claim 1, characterized in that: The locking strip (500) is a ratchet strip structure, and the locking tongue (503) has a ratchet portion (5030) for engaging with the locking strip (500).

6. The seat back lifting device according to claim 5, characterized in that: The locking tongue (503) is provided with a locking groove (5031) and an unlocking groove (5032), and the locking groove (5031) is further away from the ratchet portion (5030) than the unlocking groove (5032); When the elastic member (504) cooperates with the locking groove (5031), the elastic member (504) puts the locking tongue (503) in a locked state; when the elastic member (504) cooperates with the unlocking groove (5032), the elastic member (504) puts the locking tongue (503) in an unlocked state; The sliding groove (501) guides the locking tongue (503) to switch between a state in which the locking groove (5031) cooperates with the elastic member (504) and a state in which the unlocking groove (5032) cooperates with the elastic member (504).

7. The seat back lifting device according to claim 5, characterized in that: The lock tongue (503) has a lock tongue unlocking portion (5033), and the slide groove (501) has a guide surface (5010), and the guide surface (5010) is used to cooperate with the lock tongue unlocking portion (5033) to guide the lock tongue unlocking portion (5033) to move in a direction away from the locking strip (500), thereby driving the lock tongue (503) and the locking strip (500) to unlock.

8. The seat back lifting device according to claim 7, characterized in that: The mounting member (502) is provided with a limiting groove (5020), and the limiting groove (5020) is slidably matched with the locking tongue unlocking portion (5033).

9. The seat back lifting device according to claim 1, characterized in that: The locking tongue (503) is rotatably connected to the mounting member (502).

10. The seat back lifting device according to claim 1, characterized in that: The elastic member (504) is a torsion spring.

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