Seat back rotation mechanism

Abstract

The utility model belongs to the field of office furniture, and discloses a seat back rotation mechanism, including a support arm connected to a back support and a backrest rotatably connected to the support arm, a locking portion and a guide portion are arranged on the backrest, a rotation locking mechanism is arranged at the front end of the support arm, and the rotation locking mechanism includes a lock tongue and an elastic member, the lock tongue is movably matched on the support arm, and is locked with the locking portion, the elastic member presses the lock tongue toward the locking portion, and the guide portion is used to guide the lock tongue to move, so that the lock tongue is unlocked from the locking portion when the backrest reaches the rotation limit state. The utility model is provided with structures such as a locking portion, a guide portion, and a rotation locking mechanism, which can help the backrest to realize rotation, unlocking, locking, and the like, 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 rotation mechanism. Background Art

[0002] At present, the backrests of many seats are rotatably mounted on the back support through a rotating shaft, so that the backrests can rotate, and the torsion springs are used to enable the backrests to reset after rotation. However, this backrest rotation structure cannot meet the functional requirement of the backrests stopping at will after rotation. Utility Model Content

[0003] The purpose of the utility model is to provide a seat back rotating mechanism to solve the problems raised in the above background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A seat back rotation mechanism comprises a support arm connected to a back support and a backrest rotatably connected to the support arm, a locking portion and a guiding portion are arranged on the backrest, a rotation locking mechanism is arranged at the front end of the support arm, the rotation locking mechanism comprises a locking tongue and an elastic member, the locking tongue is movably engaged with the support arm and locked with the locking portion, the elastic member presses the locking tongue toward the locking portion, and the guiding portion is used to guide the locking tongue to move so that the locking tongue is unlocked from the locking portion when the backrest reaches the rotation limit state.

[0006] Furthermore, the locking portion is an arc-shaped ratchet structure, and the locking tongue has a ratchet portion for engaging with the arc-shaped ratchet structure.

[0007] 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;

[0008] 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;

[0009] The guide portion guides the lock 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.

[0010] Furthermore, the lock tongue has a lock tongue unlocking portion, and the guide portion is used to cooperate with the lock tongue unlocking portion, and guides the lock tongue unlocking portion to move in a direction away from the locking portion, thereby driving the lock tongue and the locking portion to unlock.

[0011] Furthermore, the support arm has a limiting groove, and the limiting groove is slidably matched with the unlocking part of the lock tongue.

[0012] Furthermore, the locking tongue is rotatably connected to the support arm.

[0013] Furthermore, the elastic member is a torsion spring.

[0014] Furthermore, the support arm is rotatably connected to the backrest via a pin.

[0015] Furthermore, a slide groove is arranged on the backrest, and the guide portion is a guide surface arranged on the slide groove.

[0016] Compared with the prior art, the beneficial effects of the utility model are: the utility model is provided with a locking part, a guiding part, a rotation locking mechanism and other structures, which can help the backrest to achieve rotation, unlocking, locking and other actions, and the backrest can achieve the effect of arbitrary stopping when rotating, and has the advantages of simple structure and convenient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model.

[0018] Figure 2 It is a partial structural schematic diagram of the utility model.

[0019] Figure 3 This is one of the schematic diagrams of the decomposition structure of the utility model.

[0020] Figure 4 This is the second schematic diagram of the decomposition structure of the utility model.

[0021] Figure 5 It is a schematic diagram of the lock tongue structure in the utility model.

[0022] Figure 6 This is a schematic diagram of the utility model in use state.

[0023] In the figure: backrest 3, locking part 300, guiding part 301, rotating connecting seat 302, supporting arm 6, limiting groove 600, ear seat 601, elastic member 700, locking tongue 701, ratchet part 7010, locking groove 7011, unlocking groove 7012, locking tongue unlocking part 7013, locking tongue rotating shaft 7014. DETAILED DESCRIPTION

[0024] 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.

[0025] See also Figure 1-Figure 6A seat back rotation mechanism includes a support arm 6 connected to a back support 1 and a backrest 3 rotatably connected to the support arm 6, a locking portion 300 and a guide portion 301 are arranged on the backrest 3, a rotation locking mechanism is arranged at the front end of the support arm 6, the rotation locking mechanism includes a locking tongue 701 and an elastic member 700, the locking tongue 701 is movably matched with the support arm 6, and is locked with the locking portion 300, the elastic member 700 presses the locking tongue 701 toward the locking portion 300, and the guide portion 301 is used to guide the locking tongue 701 to move, so that the locking tongue 701 is unlocked from the locking portion 300 when the backrest 3 reaches the rotation limit state.

[0026] Continue reading Figure 4 and Figure 5 In one embodiment of the utility model, a rotating connection seat 302 is provided in the middle of the backrest 3, and ear seats 601 are respectively provided on the left and right sides of the front end of the support arm 6. The two ear seats 601 are located on both sides of the rotating connection seat 302 and are respectively rotatably connected to the rotating connection seat 302 through a pin shaft. The rotation locking mechanism is provided on one of the ear seats 601, and the lock tongue 701 has a lock tongue rotating shaft 7014, which is rotatably connected to the circular hole on the corresponding ear seat 601.

[0027] Continue reading Figure 3 and Figure 4 In one embodiment of the utility model, a sliding groove and a ratchet groove are opened on the end surface of the rotating connecting seat 302 corresponding to the rotating locking mechanism, and a locking portion 300 is arranged on the groove wall of the ratchet groove. The locking portion 300 is an arc-shaped ratchet structure, and the lock tongue 701 has a ratchet portion 7010 for engaging with the arc-shaped ratchet structure. The ratchet is an oblique tooth. When the arc-shaped ratchet structure engages with the ratchet portion 7010, the ratchet structure enables the support arm 6 to rotate toward the inclined side of the ratchet, but cannot move toward the other side.

[0028] Continue reading Figure 3 In one embodiment of the utility model, the end cover 302 is a shell structure, the locking tongue 701 and the main body of the elastic member 700 are both arranged inside the corresponding end cover 302, the elastic member 700 is preferably a torsion spring, and the end cover 302 has a cylinder for installing the elastic member 700, one end of the elastic member 700 is connected to the locking tongue 701 for squeezing the locking tongue 701.

[0029] Continue reading Figure 5 In one embodiment of the utility model, the lock tongue 701 has a locking groove 7011 and an unlocking groove 7012, the locking groove 7011 and the unlocking groove 7012 are arranged adjacent to each other, and a raised triangular slope is provided between the two, and the locking groove 7011 is further away from the ratchet portion 7010 than the unlocking groove 7012;

[0030] When one end of the elastic member 700 is matched with the locking groove 7011, since the locking groove 7011 is far away from the ratchet part 7010, the elastic member 700 can squeeze the lock tongue 701 toward the locking part 300 for a longer distance, so that the lock tongue 701 is locked and matched with the locking part 300. When one end of the elastic member 700 is matched with the unlocking groove 7012, since the unlocking groove 7012 is closer to the ratchet part 7010, the distance that the elastic member 700 squeezes the lock tongue 701 toward the locking part 300 is relatively short, and the lock tongue 701 will not be locked with the locking part 300, that is, the elastic member 700 puts the lock tongue 701 in an unlocked state. The function of the guide portion 301 is to guide the lock tongue 701 to switch between the state in which the locking groove 7011 cooperates with the elastic member 700 and the state in which the unlocking groove 7012 cooperates with the elastic member 700, that is, to enable one end of the elastic member 700 to break through the triangular slope from the locking groove 7011 and enter the unlocking groove 7012, and to enable the elastic member 700 to break through the triangular slope from the unlocking groove 7012 and enter the locking groove 7011. The elastic member 700 can limit the lock tongue 701 in the unlocking state or the locking state by cooperating with the unlocking groove 7012 and the locking groove 7011.

[0031] Continue reading Figure 3-Figure 5 In one embodiment of the utility model, a lock tongue 701 has a lock tongue unlocking portion 7013, and the lock tongue unlocking portion 7013 is a convex column structure. A guide portion 301 is arranged on the groove wall of the slide groove. The guide portion 301 is an inclined guide surface arranged on the slide groove. The guide portion 301 is used to cooperate with the lock tongue unlocking portion 7013. When the lock tongue unlocking portion 7013 moves along the guide portion 301, the guide portion 301 guides the lock tongue unlocking portion 7013 to move in a direction away from the locking portion 300, thereby driving the lock tongue 701 to unlock the locking portion 300.

[0032] Continue reading Figure 3-Figure 5 In one embodiment of the present invention, the ear seat 601 equipped with the rotation locking mechanism has a limiting groove 600, and the limiting groove 600 is slidably matched with the lock tongue unlocking part 7013.

[0033] by Figure 6 Take this as an example to introduce the method of using the utility model:

[0034] Figure 6 The rear end of the middle support arm 6 is connected to the back bracket 1, and the front end is connected to the backrest 3. The sliding module of the utility model is arranged on the sliding seat. When the rotation locking mechanism is in the unlocked state, the backrest 3 can be rotated up and down. When the rotation locking mechanism is in the locked state, the backrest 3 cannot be rotated in the ratchet tilt direction of the locking part 300, and the backrest 3 cannot be rotated in the opposite direction.

[0035] Under normal circumstances, the ratchet portion 7010 of the locking tongue 701 is engaged with the locking portion 300, the rotation locking mechanism is in a locked state, the elastic member 700 cooperates with the locking groove 7011, and due to the characteristics of the ratchet, the backrest 3 cannot be rotated in the inclined direction of the ratchet of the locking portion 300, but can only be rotated in the opposite direction, so as to prevent the backrest 3 from rotating. Figure 6 For example, the backrest 3 can only rotate counterclockwise but not clockwise. When the backrest 3 stops, the elastic member 700 will make the ratchet portion 7010 engage with the locking portion 300 again. When the backrest 3 slides to the limit angle, the lock tongue unlocking portion 7013 encounters the guide portion 301. Under the guidance of the guide portion 301, the lock tongue unlocking portion 7013 and the lock tongue 701 rotate as a whole in a direction away from the locking portion 300. As the lock tongue 701 rotates, the elastic member 700 breaks through the triangular slope and enters the unlocking groove 7010. 012, thereby completing the unlocking and maintaining the lock tongue 701 in the unlocked state. At this time, the backrest 3 can be rotated in the opposite direction to any position. The lock tongue unlocking portion 7013 of the lock tongue 701 drives the lock tongue 701 to rotate in the opposite direction under the guidance of the guide portion 301, so that the elastic member 700 returns from the state of matching with the unlocking groove 7012 to the state of matching with the locking groove 7011. After the backrest 3 stops, under the action of the elastic member 700, the lock tongue 701 bites with the locking portion 300, and the rotation locking mechanism is locked again.

[0036] It should be noted that the meshing teeth of the locking part 300 and the ratchet part 7010 adopt a meshing structure with a small angle (7°) and a small pitch (2mm), so as to achieve a stepless effect and a smaller unlocking virtual position. The backrest in the utility model is a lower backrest.

[0037] Although 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 rotation mechanism, comprising a support arm (6) connected to a back support (1) and a backrest (3) rotatably connected to the support arm (6), characterized in that: A locking portion (300) and a guiding portion (301) are provided on the backrest (3); a rotation locking mechanism is provided at the front end of the support arm (6); the rotation locking mechanism comprises a locking tongue (701) and an elastic member (700); the locking tongue (701) is movably engaged with the support arm (6) and is locked with the locking portion (300); the elastic member (700) presses the locking tongue (701) toward the locking portion (300); and the guiding portion (301) is used to guide the locking tongue (701) to move, so that the locking tongue (701) is unlocked from the locking portion (300) when the backrest (3) reaches a rotation limit state.

2. The seat back rotation mechanism according to claim 1, characterized in that: The locking portion (300) is an arc-shaped ratchet structure, and the locking tongue (701) has a ratchet portion (7010) for engaging with the arc-shaped ratchet structure.

3. The seat back rotation mechanism according to claim 2, characterized in that: The lock tongue (701) is provided with a locking groove (7011) and an unlocking groove (7012), and the locking groove (7011) is further away from the ratchet portion (7010) than the unlocking groove (7012); When the elastic member (700) cooperates with the locking groove (7011), the elastic member (700) puts the locking tongue (701) in a locked state; when the elastic member (700) cooperates with the unlocking groove (7012), the elastic member (700) puts the locking tongue (701) in an unlocked state; The guide portion (301) guides the locking tongue (701) to switch between a state in which the locking groove (7011) cooperates with the elastic member (700) and a state in which the unlocking groove (7012) cooperates with the elastic member (700).

4. The seat back rotation mechanism according to claim 3, characterized in that: The lock tongue (701) is provided with a lock tongue unlocking portion (7013), and the guide portion (301) is used to cooperate with the lock tongue unlocking portion (7013) to guide the lock tongue unlocking portion (7013) to move in a direction away from the locking portion (300), thereby driving the lock tongue (701) and the locking portion (300) to unlock.

5. The seat back rotation mechanism according to claim 4, characterized in that: The support arm (6) is provided with a limiting groove (600), and the limiting groove (600) is slidably matched with the locking tongue unlocking portion (7013).

6. The seat back rotation mechanism according to claim 1, characterized in that: The locking tongue (701) is rotatably connected to the support arm (6).

7. The seat back rotation mechanism according to claim 1, characterized in that: The elastic member (700) is a torsion spring.

8. The seat back rotation mechanism according to claim 1, characterized in that: The support arm (6) is rotatably connected to the backrest (3) via a pin shaft.

9. The seat back rotation mechanism according to claim 1, characterized in that: A slide groove is arranged on the backrest (3), and the guide portion (301) is a guide surface arranged on the slide groove.

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