Chair backrest height adjustment structure

Abstract

This invention relates to a chair backrest height adjustment structure, primarily featuring a positioning seat located on the back of the backrest and a guide plate installed on a front of a backrest frame, which is slidably engaged with a track on the positioning seat. Additionally, an interlocking component and a driving component are placed within an interlayer space formed between the backrest frame and the guide plate. When adjusting the backrest height, a pressing portion of the driving component is pressed to move an upper end of the interlocking component forward, causing a positioning block at a lower end of the interlocking component to move backward. This action disengages a latch of the positioning block from an engagement hole on the positioning seat at the back of the backrest. After the backrest is adjusted to the desired height, releasing the pressing portion of the driving component allows the latch of the positioning block to re-engage with the engagement hole on the positioning seat, thereby achieving secure positioning. This mechanism enables a simple and convenient adjustment of the backrest height.

Description

Technical Field

[0001] The present invention relates to the technical field of chairs, and in particular to a chair back lifting structure. Prior Art

[0002] According to the system, seats can be used for people to sit on. Seats of different shapes provide various support, cushioning or lying functions. Existing seats are mainly composed of a seat and a backrest to provide support for the buttocks and back respectively, and a lifting adjustment mechanism is provided on the backrest to adjust the height to suit users of different ages and heights.

[0003] Please refer to Taiwan Announcement No. 586382, "Chair Back Lifting Structure", which is a common chair back lifting and adjustment mechanism currently available on the market. It mainly includes a support rod having a first end and a second end, the first end being mounted on the bottom of the seat, and the second end having a first side surface and a second side surface, and a sliding groove passing through the two side surfaces; a back panel being slidably mounted on the first side surface of the support rod; a locking member passing through the sliding groove and coupled to the aforementioned back panel, and moving between a fixed position and a non-fixed position; wherein, when the locking member is in the fixed position, the locking member presses against the second side surface of the support rod to limit the back panel from sliding relative to the support rod, and when in the non-fixed position, the locking member is away from the second side surface of the support rod, allowing the back panel to slide up and down relative to the support rod.

[0004] Although the "seat back lift structure" of Taiwan Announcement No. 586382 can achieve the effect of making the seat back movable and adjustable, it is necessary to repeatedly loosen and tighten the locking fasteners when adjusting the seat back height. In addition, its fixing method is mainly to achieve the effect of positioning the seat back by pressing the locking fastener against the back panel, and then the back panel presses the support rod to achieve the effect of positioning the seat back. When the user repeatedly lies on the seat back for a period of time, the locking fasteners are prone to loosening, thereby reducing its positioning effect. Therefore, when the locking fasteners are loose, the user must repeatedly tighten the locking fasteners, which not only causes inconvenience in use, but also affects the comfort of the chair.

[0005] Therefore, the inventor, in view of the above-mentioned deficiencies in the use and implementation of the existing chair back lifting structure, has developed the present invention with the assistance of his many years of manufacturing and design experience and knowledge in the relevant fields, and through various ingenuity. Summary of the Invention

[0006] The present invention relates to a chair back lifting structure, the main purpose of which is to provide a chair back lifting structure that can conveniently adjust the chair back height and firmly position the chair back.

[0007] In order to achieve the above-mentioned implementation purpose, the inventors have developed the following chair back lifting structure, which includes: a chair back, which is provided with a group of vertical parts at the back of the chair back; a chair back bracket, which is located behind the chair back and has a hollow hole on the chair back bracket; a positioning seat, which is assembled on the assembly part of the chair back, and has a track formed on both sides of the positioning seat, and the positioning seat is provided with several card holes spaced from top to bottom between the two side tracks; a guide plate, which is assembled on the chair back bracket The front of the seat back support and the guide plate form a sandwich space, and the two sides of the guide plate are respectively connected with the tracks provided on the two sides of the positioning seat in a sliding manner. A group of vertical grooves are provided at the back of the guide plate, and a first pivot is provided in the group of vertical grooves, and a through hole is provided below the group of vertical grooves; a linking member is provided in the sandwich space formed by the seat back support and the guide plate, and is located in the group of guide plate. A second pivot is provided at the middle section of the linking member to engage with the group of vertical grooves. The first pivot portion provided in the linkage is pivotally connected, and a positioning block is provided at the lower end of the linkage, the positioning block is located in the through hole below the assembly slot, and at least one tenon is formed on the front side of the positioning block to correspond to at least one of the several card holes provided in the positioning seat for positioning. A first elastic member is provided between the upper end of the linkage and the guide plate, and the two ends of the first elastic member are respectively in contact with the upper end of the linkage and the guide plate; a driving member is provided so that the driving member is set in the clamp formed by the chair back bracket and the guide plate. The driving member is provided with a layer of space and is located behind the linkage member, so that the lower end of the driving member is pivotally connected to the chair back bracket, and the upper end of the driving member is provided with a pressing portion to abut against the upper end of the linkage member, and the pressing portion of the driving member is located in the hollow hole of the chair back bracket. A through hole is provided at the middle section of the driving member, and the through hole corresponds to the position of the positioning block of the linkage member, and a second elastic member is provided at the through hole, and the two ends of the second elastic member are respectively abutted against the positioning block of the linkage member and the chair back bracket.

[0008] In the chair back lifting structure as described above, a seat assembly portion is formed on the lower end of the chair back bracket.

[0009] In the chair back lifting structure as described above, the positioning block is integrally connected to the lower end of the linkage.

[0010] In the chair back lifting structure as described above, the positioning block is provided with a hollow portion for being plugged and assembled with the lower end of the linkage member.

[0011] When the seat back is adjusted to the desired height, the pressing portion of the driving member is released to reengage the tenon of the positioning block with the hole of the positioning seat on the back of the seat, thereby achieving the effect of easily adjusting the seat back height. Simple diagram description

[0012] Figure 1: 3D exploded view of the present invention

[0013] Figure 2: Partially enlarged exploded view of the present invention

[0014] Figure 3: A perspective view of the present invention

[0015] Figure 4: Cross-sectional view of the present invention

[0016] Figure 5: Usage state diagram of the present invention (I)

[0017] Figure 6: Usage diagram of the present invention (II)

[0018] Figure 7: Usage diagram of the present invention (3) Implementation Method

[0019] In order to make the technical means of the present invention and the effects that can be achieved more completely and clearly disclosed, the following is a detailed description. Please refer to the disclosed figures and figure numbers: First, please refer to the first to fourth figures, which are the chair back lifting structure of the present invention, which mainly includes: a chair back (1), which is pre-set with a group of standing parts (11) at a suitable position behind the chair back (1); a chair back bracket (2), which is located behind the chair back (1), and has a chair seat assembly part (21) extending forward formed at the lower end of the chair back bracket (2), and the chair back bracket (2) is provided with a hollow hole (22) at a suitable position near its upper end; a positioning seat (3), which is screwed into the positioning seat (3) A locking member (33) such as a screw is connected and assembled on the assembly part (11) of the chair back (1), and a track (31) is formed on the left and right sides of the positioning seat (3), and the positioning seat (3) is located between the two tracks (31) and is provided with a number of card holes (32) spaced from top to bottom; a guide plate (4) is connected and assembled on the front of the chair back bracket (2) with a locking member (44) such as a screw, so that an interlayer space (41) is formed between the guide plate (4) and the chair back bracket (2), and the left and right sides of the guide plate (4) are respectively slidably connected with the tracks (31) provided on the left and right sides of the positioning seat (3), and the guide plate (4) is provided on the left and right sides of the positioning seat (3). A group of vertical grooves (42) is provided at the back, and a first pivot portion (421) in the form of a pivot groove is provided in the group of vertical grooves (42), and a rectangular through hole (43) is provided below the group of vertical grooves (42); a linking member (5) is provided in the interlayer space (41) formed by the chair back support (2) and the guide plate (4), and is located in the group of vertical grooves (42) of the guide plate (4), and a second pivot portion (51) in the form of a pivot is formed at the middle section of the linking member (5) to be pivotally connected to the first pivot portion (421) in the form of a pivot groove of the group of vertical grooves (42), and a positioning block (52) is provided at the lower end of the linking member (5), and the positioning block (52) is It can be connected to the lower end of the linkage (5) as a whole. The main embodiment of the present invention is that the positioning block (52) is provided with a hollow portion (521) to be plugged and assembled with the lower end of the linkage (5). The positioning block (52) is located in the rectangular through hole (43) below the assembly groove (42), and at least one latch (522) is formed on the front side of the positioning block (52) to correspond to at least one of the latch holes (32) provided on the positioning seat (3) for latching and positioning. In addition, a first elastic member (53) is provided between the upper end of the linkage (5) and the guide plate (4). The two ends of the first elastic member (53) are respectively in contact with the upper end of the linkage (5) and the guide plate (4).A driving member (6) is provided in a sandwich space (41) formed by the backrest bracket (2) and the guide plate (4) and is located behind the linkage member (5). The lower end of the driving member (6) is provided with a third pivot portion (61) in the form of a pivot shaft to be pivotally connected to a fourth pivot portion (23) in the form of a pivot groove provided in front of the backrest bracket (2). The upper end of the driving member (6) is provided with a pressing portion (62) to contact the upper end of the linkage member (5). The pressing portion (62) of the driving member (6) is located in the hollow hole (22) of the chair back support (2), and a through hole (63) is provided at the middle section of the driving member (6). The through hole (63) corresponds to the position of the positioning block (52) of the linking member (5), and a second elastic member (64) is provided at the through hole (63). The two ends of the second elastic member (64) are respectively in contact with the positioning block (52) of the linking member (5) and the chair back support (2).

[0020] Accordingly, when the user wants to adjust the height of the chair back (1), please refer to the fifth figure and apply force to press the pressing portion (62) of the driving member (6) protruding from the hollow hole (22) of the chair back bracket (2) to drive the upper end of the connecting member (5) to move forward. At this time, with the middle section of the connecting member (5) and the guide plate (4) as the fulcrum, the lower end of the connecting member (5) is relatively moved backward, so that the tenon (522) provided on the front side of the positioning block (52) at the lower end of the connecting member (5) is disengaged from the locking state of the locking hole (32) of the positioning seat (3) set at the rear of the chair back (1).

[0021] Please refer to FIG6, and the user can then adjust the height of the chair back (1). When the desired height is reached, please refer to FIG7, and the user can release the pressing portion (62) of the driving member (6). At this time, the first elastic member (53) and the second elastic member (64) compressed due to the forward displacement of the upper end of the linking member (5) and the backward displacement of the positioning block (52) at the lower end of the linking member (5) can be restored to their original state, so as to push the upper end of the linking member (5) backward and reset, and push the positioning block (52) set at the lower end of the linking member (5) forward and reset, so that the tenon (522) set at the front side of the positioning block (52) is re-engaged with the locking hole (32) of the positioning seat (3) set at the rear of the chair back (1), thereby completing the adjustment and positioning of the chair back (1) in a simple manner.

[0022] Here, when the present invention is used, it is only necessary to lightly press and release the pressing portion (62) of the driving member (6) to achieve the effect of adjusting the height of the chair back, thereby omitting the action of repeatedly loosening and tightening the locking member of the existing chair back lifting structure. Moreover, since the present invention uses the latching positioning method of the latching tenon (522) provided on the positioning block (52) and the latching hole (32) of the positioning seat (3) provided behind the chair back (1) to fix the position of the chair back (1), the chair back (1) will not become loose even if the user repeatedly lies on it, and the chair back (1) will not need to be repositioned, thereby improving the convenience of use and riding comfort.

[0023] The aforementioned embodiments or drawings do not limit the implementation of the present invention. The present invention can also arrange the positioning block (52) of the linkage (5) at the upper end of the linkage (5), and arrange the pressing portion (62) of the driving member (6) at the lower end of the driving member (6) to contact the lower end of the linkage (5). When the pressing portion (62) of the driving member (6) is pressed, the lower end of the linkage (5) is driven to move forward, and the positioning block (52) set at the upper end of the linkage (5) is moved backward. In this way, the effect of movably disengaging or engaging the tenon (522) set at the front side of the positioning block (52) and the clamping hole (32) of the positioning seat (3) set at the back of the chair back (1) can also be achieved. Any appropriate changes or modifications made by those with ordinary knowledge in the technical field should be regarded as not departing from the patent scope of the present invention.

[0024] From the above structure and implementation, it can be seen that the present invention has the following advantages:

[0025] 1. The chair back lifting structure of the present invention can achieve the effect of adjusting the chair back height by simply pressing, which is extremely convenient to operate and use.

[0026] 2. The chair back lift mechanism of the present invention uses a latch to secure the adjusted chair back height. Therefore, the existing chairs do not use fasteners such as screws to lock the chair back, which can easily loosen when the chair back is repeatedly reclined, thus improving the comfort and convenience of the chair.

[0027] In summary, the embodiments of the present invention can indeed achieve the expected effects. Moreover, the specific structure disclosed therein has not only never been seen in similar products, but has also not been disclosed before the application. Therefore, it fully complies with the provisions and requirements of the Patent Law. Therefore, an application for an invention patent is filed in accordance with the law. I sincerely request that you examine it and grant the patent. I would be truly grateful for your kindness.

[0028] 1: Chair back

[0029] 11: Assembly Department

[0030] 2: Seat back support

[0031] 21: Seat assembly

[0032] 22: Hollow hole

[0033] 23: The Fourth Hub

[0034] 3: Positioning seat

[0035] 31: Track

[0036] 32: Card hole

[0037] 33: Locking firmware

[0038] 4: Guide plate

[0039] 41: Mezzanine Space

[0040] 42: Assembly slot

[0041] 421: First Hub

[0042] 43:Through hole

[0043] 44: Locking firmware

[0044] 5: Linkage

[0045] 51: Second pivot

[0046] 52: Positioning block

[0047] 521: Hollow

[0048] 522: tenon

[0049] 53: first elastic member

[0050] 6: Driving parts

[0051] 61: The third hub

[0052] 62: Pressing part

[0053] 63:Through hole

[0054] 64: Second elastic member

Claims

1. A chair back lift structure, comprising: a chair back having a set of upright portions at a rear side of the chair back; a chair back bracket located behind the chair back and having a hollow hole formed in the chair back bracket; a positioning seat assembled to the assembly portion of the chair back, a track formed on each side of the positioning seat, and a plurality of locking holes spaced apart from top to bottom between the two tracks of the positioning seat; a guide plate assembled to the front side of the chair back bracket, forming an interlayer space between the chair back bracket and the guide plate, the guide plate having two sides slidably engaged with the tracks formed on the two sides of the positioning seat, a set of upright slots formed at the rear side of the guide plate, a first pivot portion provided in the set of upright slots, and a through hole provided below the set of upright slots; a linkage, wherein the linkage is disposed in a sandwich space formed by the chair back support and the guide plate and is located in an assembly groove of the guide plate, and a second pivot portion is provided at a middle section of the linkage to be pivotally connected to a first pivot portion provided in the assembly groove, and a positioning block is provided at a lower end of the linkage, the positioning block is located in a through hole below the assembly groove, and at least one tenon is formed on a front side of the positioning block to engage with at least one of the plurality of locking holes provided in the positioning seat for positioning, and a first elastic member is provided between an upper end of the linkage and the guide plate, and two ends of the first elastic member are respectively in contact with an upper end of the linkage and the guide plate; A driving member is arranged in the interlayer space formed by the chair back bracket and the guide plate and is located behind the linkage member. The lower end of the driving member is pivotally connected to the chair back bracket. The upper end of the driving member is provided with a pressing portion to abut against the upper end of the linkage member, and the pressing portion of the driving member is located in the hollow hole of the chair back bracket. A through hole is provided at the middle section of the driving member, and the through hole corresponds to the position of the positioning block of the linkage member. A second elastic member is provided at the through hole, and the two ends of the second elastic member are respectively in abutment against the positioning block of the linkage member and the chair back bracket.

2. The chair back lifting structure as described in claim 1, wherein: A seat assembly portion is formed on the lower end of the chair back support.

3. The chair back lifting structure as described in claim 1, wherein: The positioning block is connected to the lower end of the linking member as a whole.

4. The chair back lifting structure as described in claim 1, wherein: The positioning block is provided with a hollow portion for plugging and assembling with the lower end of the linkage member.

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