Backrest height adjustment mechanism

Abstract

This device provides a backrest height adjustment mechanism that reduces the overall packaging volume by adjusting the backrest to a lower position for storage. [Solution] The backrest height adjustment mechanism 3 is provided between the backrest assembly 1 and the chair back tube 2. The backrest height adjustment mechanism has an adjustment seat 31, a backrest fixing seat, and a pull rod 33. The adjustment seat is attached and coupled to the backrest assembly so that its top end corresponds to it, and has a long groove 311 provided from the bottom end to the top. Multiple adjustment grooves 312 are provided on the front end surface of the adjustment seat at positions corresponding to the long groove. The backrest fixing seat is coupled so as to cover the chair back tube. At the front end of the backrest fixing seat, a front groove hole 321 is formed at positions corresponding to the multiple adjustment grooves, and a through groove hole 322 for fitting the adjustment seat is formed from the end surface to the bottom. The through groove hole communicates with the front groove hole.

Description

[[Technical Field]]

[0001] The present invention relates to a chair backrest adjustment technology, and in particular to a backrest height adjustment mechanism. [[Background Art]]

[0002] Conventionally, in chairs for people to sit on, in order to improve sitting comfort, manufacturers adjust the position of related components to achieve directional adjustment according to the body shape of each user (for example, the height of the chair, the height of armrests or the displacement in front-back and inner-outer directions, the inclination or front-back displacement of the backrest, etc.) as appropriate, so that components can be adjusted flexibly in a timely manner when using the chair.

[0003] Generally, the height of a chair backrest needs to be adjusted based on each user's height, "usage conditions" and "body support requirements", so as to reliably and closely support the lumbar spine and back, and prevent the top end of the chair backrest from pressing against the shoulders. When adjusted appropriately, pressure on the back can be effectively dispersed, preventing stiffness in the shoulders and neck, low back pain, back pain and other discomforts. For example, many adjustment structures or devices have already been commercially available, such as the chair backrest height adjustment structure disclosed in Patent Document 1, and the chair backrest height adjustment device for office chairs disclosed in Patent Document 2. However, although the above-mentioned structures can adjust the height of the chair (backrest), they have complicated structures and relatively high costs. In addition, these chairs cannot be adjusted to a low position to effectively reduce the volume. As a result, when transporting the product, the packaging volume is large and takes up too much space, which easily leads to high transportation costs.

[0004] Therefore, based on the supreme philosophy of perfecting products, with the help of years of manufacturing and design experience and knowledge in related fields, the inventor of the present invention devised the present invention through multi-faceted ingenuity and experiments. [[Prior Art Documents]] [[Patent Documents]]

[0005] [Patent Document 1] Taiwan Utility Model Registration No. M564967 (Publication) [Patent Document 2] Taiwan Utility Model Registration No. M408995 Publication [Overview of the project] [Problems that the invention aims to solve]

[0006] The main objective of this invention is to provide a backrest height adjustment mechanism that allows for easy adjustment of the backrest height via a pull rod, and also reduces the overall packaging volume by adjusting it to a lower height for storage. [Means for solving the problem]

[0007] To solve the above problems, according to a first embodiment of the present invention, a backrest height adjustment mechanism is provided between a backrest assembly and a chair back tube, the backrest height adjustment mechanism having an adjustment seat, a backrest fixing seat and a pull rod, the adjustment seat is attached and coupled to the backrest assembly so that its top end corresponds to it and has a long groove provided from the bottom end to the top, the front end surface of the adjustment seat has a plurality of adjustment grooves at positions corresponding to the long groove, the backrest fixing seat is coupled so as to cover the chair back tube, the front end of the backrest fixing seat has front groove holes formed at positions corresponding to the plurality of adjustment grooves and a through groove hole for fitting the adjustment seat is formed from the end surface to the bottom, The present invention provides a backrest height adjustment mechanism characterized in that a through groove is in communication with the front groove, a rear groove is formed at the rear end of the backrest fixing seat at a position corresponding to the front groove, the pull rod is fitted into an elastic member and inserted through the rear groove into the chair back tube and the long groove and fitted into the front groove, a fitting block is provided at the end of the pull rod, the fitting block is located in the front groove, the elastic member is located in the rear groove, the fitting block is fitted into one of the adjustment grooves and positioned as the pull rod is displaced, or disengages from one of the adjustment grooves and releases the adjustment seat, thereby adjusting the height of the backrest assembly in conjunction with the adjustment seat.

[0008] The backrest fixing seat is composed of a front seat and a rear seat, with a first recess provided in the front seat at a position corresponding to the chair back tube, and a second recess provided in the rear seat at a position corresponding to the chair back tube, wherein the first and second recesses cover the chair back tube in corresponding manner, and screw-fitting members are inserted into the rear seat, the chair back tube, and the front seat and screwed together.

[0009] Preferably, the through groove is formed on the front seat and communicates with the front groove, with the front groove located on the front end face of the front seat, and the rear groove is located on the rear seat, with a hole for inserting the pull rod formed on the chair back tube. [Effects of the Invention]

[0010] The backrest height adjustment mechanism according to this invention allows for easy adjustment of the backrest height via a pull rod, and also reduces the overall packaging volume by adjusting it to a lower height for storage. [Brief explanation of the drawing]

[0011] [Figure 1] This is an exploded perspective view showing a backrest height adjustment mechanism according to one embodiment of the present invention. [Figure 2] This is an assembled perspective view showing a backrest height adjustment mechanism according to one embodiment of the present invention. [Figure 3] This is a cross-sectional view (1) showing a backrest height adjustment mechanism according to one embodiment of the present invention. [Figure 4] This is a cross-sectional view (2) showing a backrest height adjustment mechanism according to one embodiment of the present invention. [Figure 5] This is a cross-sectional view (3) showing a backrest height adjustment mechanism according to one embodiment of the present invention. [Modes for carrying out the invention]

[0012] To more fully and clearly disclose the technical details, objectives, and effects achieved in this invention, they will be described in detail below. Please also refer to the accompanying drawings and reference numerals.

[0013] First, refer to Figures 1 and 2. Figure 1 is an exploded perspective view showing a backrest height adjustment mechanism according to one embodiment of the present invention. Figure 2 is an assembled perspective view showing a backrest height adjustment mechanism according to one embodiment of the present invention.

[0014] As shown in Figures 1 and 2, the backrest height adjustment mechanism 3 according to one embodiment of the present invention is provided between the backrest assembly 1 and the chair back tube 2.

[0015] As shown in FIGS. 1 and 2, a backrest height adjustment mechanism 3 according to an embodiment of the present invention includes an adjustment seat 31, a backrest fixing seat 32, and a pull rod 33.

[0016] The adjustment seat 31 is mounted and coupled to the backrest assembly 1 such that the top end thereof corresponds, and has an elongated groove 311 provided from the bottom end to the upper portion. A plurality of adjustment grooves 312 are provided on the front end face of the adjustment seat 31 at a position corresponding to the elongated groove 311.

[0017] The backrest fixing seat 32 is coupled so as to cover the chair back tube 2. At the front end of the backrest fixing seat 32, a front groove hole 321 is formed at a position corresponding to the plurality of adjustment grooves 312, and a through groove hole 322 into which the adjustment seat 31 is fitted is formed from the end face to the lower portion. The through groove hole 322 communicates with the front groove hole 321. At the rear end of the backrest fixing seat 32, a rear groove hole 323 is formed at a position corresponding to the front groove hole 321.

[0018] The pull rod 33 is fitted onto an elastic member 331, and is inserted through the chair back tube 2 and the elongated groove 311 via the rear groove hole 323 to be fitted into the front groove hole 321. A fitting block 332 is provided at the distal end of the pull rod 33. The fitting block 332 is located in the front groove hole 321.

[0019] Along with the displacement of the pull rod 33, the fitting block 332 is fitted into and positioned in one of the adjustment grooves 312, or is disengaged from one of the adjustment grooves 312 to release the adjustment seat 31, and the height of the backrest assembly 1 is adjusted in conjunction with the adjustment seat 31.

[0020] Reference is made to FIGS. 1 to 5. As shown in FIGS. 1 to 5, in actual use, the backrest height adjustment mechanism according to the present invention is installed on any type of chair that requires a backrest to be mounted. First, a fitting portion 11 is provided on the backrest assembly 1 as described above, and the adjustment seat 31 is fitted and screwed into the fitting portion 11. The adjustment seat 31 is then attached and joined to the backrest assembly 1, and the backrest fixing seat 32 is then installed so as to cover the chair back tube 2. The backrest fixing seat 32 consists of a front seat 32a and a rear seat 32b. A first recess 320a is provided in the front seat 32a at a position corresponding to the chair back tube 2. A second recess 320b is provided in the rear seat 32b at a position corresponding to the chair back tube 2, and the first recess 320a and the second recess 320b cover the chair back tube 2 in corresponding manner, and the screw member 4 is inserted into the rear seat 32b, the chair back tube 2 and the front seat 32a and screwed in. The through groove 322 is formed on the front seat 32a and communicates with the front groove 321, and the front groove 321 is located on the front end face of the front seat 32a. The rear groove 323 is located on the rear seat 32b, and a hole 21 for inserting the pull rod 33 is formed on the chair back tube 2. As a result, after the elastic member 331 is fitted onto the pull rod 33, it is inserted through the rear groove hole 323 into the hole 21 and long groove 311 of the chair back tube 2 and fitted into the front groove hole 321, and the fitting block 332 is fitted onto the end of the pull rod 33 as described above, so that the fitting block 332 is positioned inside the front groove hole 321, supports the elastic member 331 in an open position, and engages with one of the adjustment grooves 312 to be positioned (Figure 3 shows the state in which it is positioned inside the uppermost adjustment groove 312). At this time, the position of backrest assembly 1 is in the low position.

[0021] When adjusting the height of the backrest assembly 1, as shown in Figure 4, pressing the pull rod 33 toward the rear groove hole 323 causes it to displace, compressing the elastic member 331 and disengaging the fitting block 332 of the pull rod 33 from one of the adjustment grooves 312. At this point, the backrest assembly 1 becomes a displaceable, released state, allowing the height of the backrest assembly 1 to be adjusted by displacing it. As shown in Figure 5, when the backrest assembly 1 is raised, the pull rod 33 corresponds to the lowest adjustment groove 312. When the pull rod 33 is released, the elastic member 331 releases its elastic force, causing the fitting block 332 to fit and position in the corresponding adjustment groove 312, thus completing the height adjustment of the backrest assembly 1.

[0022] It is worth noting that this invention allows the user to adjust the height of the backrest based on their height or desired comfort level. Furthermore, by adjusting the backrest to a lower position, the volume of the packaging material is reduced, increasing the number of items that can be loaded into a container for transport, effectively saving space, reducing transportation costs, and enabling convenient transportation.

[0023] The above-described embodiments or drawings are not intended to limit the form, structure, or method of use of the product of this invention, and appropriate modifications or alterations by persons with ordinary skill in the art should also be considered to be included in the scope of the utility model registration claims of this invention.

[0024] As can be seen from the above-described structural composition and usage of the present invention, the present invention has the following advantages (1) to (4) compared to conventional structures.

[0025] (1) The design allows the backrest height to be adjusted by raising or lowering it, so that it can be adjusted according to each user's height and the comfortable backrest support height desired by each user, thereby improving seating comfort. (2) The backrest height adjustment mechanism can be adjusted in multiple stages to accommodate the desired support height. (3) The backrest height can be adjusted by a simple pull rod pressing action, making it convenient to use and easy to operate. (4) By adjusting the backrest to a lower position, the overall packaging volume of the chair can be reduced, increasing the amount of product that can be loaded and transported, and effectively saving on transportation costs.

[0026] In summary, the embodiments of this invention can reliably achieve the expected effects of use, and the specific structure disclosed is not only unique to this type of product but has also not been publicly disclosed prior to filing, thus fully satisfying the provisions and requirements of the Utility Model Law. Therefore, in accordance with the law, we hereby file this application for registration of a utility model. [Explanation of symbols]

[0027] 1. Backrest Assembly 2 Chair back tube 3. Backrest height adjustment mechanism 4. Threaded member 11 Fitting part 21 Perforation 31 Adjustment seat 32 Fixed backrest seat 32a Undercard 32b Rear seat 33 Pull Rod 311 Nagomi Road 312 Adjustment groove 320a First recess 320b Second recess 321 Anterior Slot 322 Through groove hole 323 Posterior sulcus 331 Elastic members 332 Interlocking Block

Claims

1. A backrest height adjustment mechanism provided between the backrest assembly and the chair back tube, The backrest height adjustment mechanism includes an adjustment seat, a backrest fixing seat, and a pull rod. The adjustment seat is mounted and coupled to the backrest assembly so that its top end corresponds to it, and has a long groove extending from the bottom end to the top, and the front end surface of the adjustment seat has a plurality of adjustment grooves provided at positions corresponding to the long groove. The backrest fixing seat is coupled so as to cover the chair back tube, and at the front end of the backrest fixing seat, front groove holes are formed at positions corresponding to the plurality of adjustment grooves, and a through groove hole for fitting the adjustment seat is formed from the end face downwards, the through groove hole is in communication with the front groove hole, and at the rear end of the backrest fixing seat, a rear groove hole is formed at a position corresponding to the front groove hole. The pull rod is fitted onto the elastic member and inserted through the rear groove into the chair back tube and the long groove, and then fitted into the front groove. A fitting block is provided at the end of the pull rod, the fitting block is located within the front groove, and the elastic member is located within the rear groove. A backrest height adjustment mechanism characterized in that the fitting block is positioned by fitting into one of the adjustment grooves as the pull rod is displaced, or disengages from one of the adjustment grooves to release the adjustment seat, thereby adjusting the height of the backrest assembly in conjunction with the adjustment seat.

2. The backrest height adjustment mechanism according to claim 1, characterized in that the backrest fixing seat is composed of a front seat and a rear seat, a first recess is provided in the front seat at a position corresponding to the chair back tube, a second recess is provided in the rear seat at a position corresponding to the chair back tube, the first recess and the second recess cover the chair back tube in corresponding manner, and a screw-in member is inserted into the rear seat, the chair back tube and the front seat and screwed together.

3. The backrest height adjustment mechanism according to claim 2, characterized in that the through groove is formed on the front seat and communicates with the front groove, the front groove is located on the front end surface of the front seat, the rear groove is located on the rear seat and a hole for inserting the pull rod is formed on the chair back tube.

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