A chair back frame

Abstract

The utility model discloses a chair back frame, including back frame main part, the back frame main part front is provided with the hinged seat, is provided with the pivot on the hinged seat, and the waist pillow is rotated and is connected with the hinged seat through the pivot, the pivot is equipped with the cylindrical spiral torsion spring, and it includes spiral turns, and the first abutting end of the radial outward extension is formed on the outer wall of spiral turns two sides, and the second abutting end sets up to the opposite direction to the first abutting end, and the first abutting end and the second abutting end correspond to the upper end of the hinged seat and the waist pillow and are pressed, the waist pillow of the utility model can axial rotation, provides the most comfortable support position, and the cylindrical spiral torsion spring can make the waist pillow can provide the different force degree support, and the adaptability and the comfort are good.

Description

Technical Field

[0001] This utility model relates to the field of chair technology, specifically to a chair back frame. Background Technology

[0002] A chair is a common piece of furniture. A chair consists of chair legs, a seat attached to the top of the chair legs, and a backrest connected to the seat. The seat supports the buttocks of the human body, and the backrest supports the waist of the human body.

[0003] Existing chair backs are fixed structures, which offer poor lumbar support. Users of different heights have varying lumbar curves and lumbar spine heights: taller users have higher lumbar spine positions, and the lumbar support of a fixed chair back is often positioned too low, failing to conform to the physiological curvature of their lumbar spine and easily causing their lower back to be unsupported; shorter users have lower lumbar spine positions, and a fixed lumbar support will press against their upper lumbar region, causing localized compression.

[0004] Users of different weights have different needs for lumbar support: heavier users need stronger lumbar support, but the support strength of a fixed chair back is fixed and cannot be increased with weight, which can easily lead to lumbar support collapse or insufficient support; lighter users may experience discomfort due to excessive fixed support. Utility Model Content

[0005] In order to overcome at least one of the technical problems existing in the prior art, this utility model provides a chair back frame with a lumbar pillow that can rotate axially to provide the most comfortable support position. The cylindrical helical torsion spring enables the lumbar pillow to provide different levels of support, resulting in good adaptability and comfort.

[0006] A chair back frame includes a back frame body, a hinge seat is installed at the front of the back frame body, a pivot is installed on the hinge seat, and a lumbar pillow is rotatably connected to the hinge seat through the pivot.

[0007] A cylindrical helical torsion spring is fitted on the rotating shaft. The spring includes a helical coil. A first abutment end and a second abutment end are formed on the outer walls of both sides of the helical coil, extending radially outward. The first abutment end and the second abutment end are arranged in opposite directions. The first abutment end and the second abutment end abut against the upper ends of the hinge seat and the lumbar pillow respectively.

[0008] When the lumbar pillow is pressed, it can rotate along the axis of rotation, and the included angle between the first and second abutting ends of the cylindrical helical torsion spring can change with the magnitude of the pressing force.

[0009] In some embodiments, the hinged seat includes a seat plate and upright plates symmetrically arranged at both ends of the seat plate. Slots are symmetrically opened on the inner sidewalls of the two upright plates, and a first through hole is opened on each upright plate, communicating with the slot. Connecting plates are symmetrically arranged on both sides of the lumbar pillow, and second through holes are symmetrically opened on the two connecting plates. The two upright plates are placed between the two connecting plates, and the two ends of the rotating shaft are correspondingly placed into the slots of the two upright plates. The two connecting plates, the two upright plates and the rotating shaft are connected by fasteners.

[0010] In some embodiments, a first spring insertion hole is provided at the upper end of the seat plate, and the first spring insertion hole is located between the two upright plates; two second spring insertion holes are provided side by side at the upper end of the lumbar pillow; a first abutting end is located in the middle of the cylindrical helical torsion spring, and the first abutting end is inserted into the first spring insertion hole; there are two second abutting ends, symmetrically located at both ends of the cylindrical helical torsion spring, and the two second abutting ends are correspondingly inserted into the two second spring insertion holes.

[0011] In some embodiments, a recessed cavity is provided on the back of the back frame body, and multiple screws are provided in the recessed cavity. The multiple screws pass through the back frame body to fasten the hinge seat, and a decorative cover is detachably installed in the recessed cavity.

[0012] In some embodiments, the back frame body and the lumbar pillow have a hollow structure, and recessed grooves are provided on the periphery of the back frame body and the lumbar pillow for installing breathable mesh fabric; connecting shafts are symmetrically provided at both ends of the back frame body for connecting and fixing to the chair.

[0013] Compared with the prior art, the technical solution of this utility model has the following advantages:

[0014] 1. The lumbar pillow can rotate along the axis of rotation. Users of different heights or weights can rotate and adjust the angle between the lumbar pillow and their waist according to their own needs to find the most comfortable support position.

[0015] 2. When the user's waist rests on the lumbar pillow, the lumbar pillow is pressed by the user's waist. The included angle between the first and second abutment ends of the cylindrical helical torsion spring automatically decreases. Users of different heights or weights apply different forces to the lumbar pillow, and the included angle between the first and second abutment ends also changes differently. Under the reaction force of the cylindrical helical torsion spring, the lumbar pillow can provide different levels of support, resulting in better adaptability and comfort.

[0016] Additional aspects and advantages of this invention will continue to be set forth in the description which follows, and in part will be obvious from the description or may be learned by practice of this invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a frontal stereoscopic structural diagram of this application;

[0019] Figure 2 This is a rear-view stereoscopic structural diagram of this application;

[0020] Figure 3 yes Figure 1 A schematic diagram of the split structure;

[0021] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0022] Figure 5 yes Figure 2 A schematic diagram of the split structure;

[0023] Figure 6 yes Figure 5 Enlarged view of point B in the middle;

[0024] Figure 7 This is a side structural diagram of this application;

[0025] Figure 8 yes Figure 7 A schematic diagram of the cross-sectional structure;

[0026] Figure 9 This is a schematic diagram of the combined structure of the hinged seat and the cylindrical helical torsion spring.

[0027] Figure 10 This is a schematic diagram of the combined structure of a cylindrical helical torsion spring and a rotating shaft.

[0028] Figure label:

[0029] Back frame body 1, recessed cavity 100, decorative cover 101, connecting shaft 102;

[0030] Hinged base 2, base plate 200, upright plate 201, slot 202, first through hole 203, first spring insertion hole 2001;

[0031] Shaft 3, central hole 300;

[0032] Cylindrical helical torsion spring 4, helical coil 400, first abutment end 401

[0033] Second abutment end 402;

[0034] Lumbar pillow 5, connecting plate 500, second through hole 501, second spring insertion hole 502;

[0035] Fastener 6, recessed groove 7. Detailed Implementation

[0036] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0037] In the description of this utility model, it should be understood that the directional descriptions, such as the terms "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] Reference Figures 1-10 A chair back frame includes a back frame body 1, a hinge seat 2 installed on the front of the back frame body 1, a rotating shaft 3 installed on the hinge seat 2, and a lumbar pillow 5 rotatably connected to the hinge seat 2 via the rotating shaft 3. An integrally formed cylindrical helical torsion spring 4 is sleeved on the rotating shaft 3, which includes a helical coil 400. A first abutment end 401 and a second abutment end 402 extending radially outward are formed on the outer walls of both sides of the helical coil 400. The first abutment end 401 and the second abutment end 402 are arranged in opposite directions and abut against the upper ends of the hinge seat 2 and the lumbar pillow 5 respectively. When the lumbar pillow 5 is pressed, the lumbar pillow 5 can rotate axially along the rotating shaft 3, and the included angle between the first abutment end 401 and the second abutment end 402 of the cylindrical helical torsion spring 4 can change with the magnitude of the pressing force.

[0041] When in use, because the lumbar pillow 5 can rotate along the axis of the pivot 3, that is, rotate up or down by a certain angle, users of different heights or weights can adjust the angle between the lumbar pillow 5 and their waist according to their own needs to find the most comfortable support position. When the user's waist rests on the lumbar pillow 5, the lumbar pillow 5 is pressed by the user's waist, and the included angle between the first abutment end 401 and the second abutment end 402 of the cylindrical helical torsion spring 4 automatically decreases. The force applied to the lumbar pillow 5 by users of different heights or weights is also different, and the included angle between the first abutment end 401 and the second abutment end 402 changes differently. Under the reaction force of the cylindrical helical torsion spring 4, the lumbar pillow 5 can provide different levels of support, making it more adaptable and comfortable.

[0042] In some embodiments, the hinge seat 2 includes a rectangular seat plate 200 and upright plates 201 symmetrically arranged at both ends of the seat plate 200, with a U-shaped groove formed between them. U-shaped slots 202 are symmetrically opened on the inner sidewalls of the two upright plates 201, and a first through hole 203 communicating with the slot 202 is opened on each upright plate 201. Connecting plates 500 are symmetrically arranged on both sides of the lumbar pillow 5, with a U-shaped groove formed between them. Second through holes 501 are symmetrically opened on the two connecting plates 500. The two upright plates 201 are inserted between the two connecting plates 500, and the two ends of the rotating shaft 3 are correspondingly inserted into the slots 202 of the two upright plates 201. The two connecting plates 500 and the two upright plates... The lumbar support 5 and the pivot 3 are connected by fasteners 6, thus connecting the lumbar support 5, the pivot 3, and the hinge seat 2. By setting the two upright plates 201 of the hinge seat 2 to different vertical heights, the rotation angle of the lumbar support 5 can be changed by changing the distance between the two upright plates 201 and the lumbar support 5. The fasteners 6 can be suitable components such as pins or bolts. One end of the bolt has a nut threaded on it, which can be used to adjust the tightness of the rotation of the lumbar support 5, making installation and disassembly convenient. The pivot 3 is a hollow tube with a first through hole 203, a second through hole 501, and a central hole 300, which are used for the fasteners 6 to pass through one end and be fastened with a nut or other parts at the other end.

[0043] In some embodiments, a first spring insertion hole 2001 is provided at the upper end of the seat plate 200, and the first spring insertion hole 2001 is located between two upright plates 201; two second spring insertion holes 502 are provided side by side at the upper end of the lumbar pillow 5; the first abutment end 401 is approximately U-shaped, located in the middle of the cylindrical helical torsion spring 4, and is evenly stressed, and is inserted into the first spring insertion hole 2001; there are two second abutment ends 402, approximately L-shaped, and symmetrically located at both ends of the cylindrical helical torsion spring 4, and are evenly stressed, and the two second abutment ends 402 are correspondingly inserted into the two second spring insertion holes 502 for limiting, and a concave hole can also be provided on the side wall of each second spring insertion hole 502, and the end of the L-shaped second abutment end 402 is inserted into the concave hole, making the connection more secure; the above structure makes it convenient and quick to install and disassemble the cylindrical helical torsion spring 4, the structure is stable, and the cylindrical helical torsion spring 4 is evenly stressed.

[0044] In some embodiments, a trapezoidal recessed cavity 100 is provided on the back of the back frame body 1. Four screws are evenly arranged in the recessed cavity 100. The four screws pass through the back frame body 1 to fasten the hinge seat 2. A decorative cover 101 is detachably installed in the recessed cavity 100, which can be fixed by screws or buckles. It is easy to install and remove, and the appearance is more beautiful.

[0045] In some embodiments, the back frame body 1 and the lumbar pillow 5 have a hollow structure, that is, one or more ventilation holes are provided to reduce weight and cost and provide good breathability; the outer periphery of the back frame body 1 and the lumbar pillow 5 are provided with recessed grooves 7 for installing breathable mesh fabric. The breathable mesh fabric is laid on the front of the back frame body 1 and the lumbar pillow 5, and the outer periphery of the breathable mesh fabric can be fastened in the recessed grooves 7 with nails. The breathable mesh fabric has good breathability and good elastic support; the two ends of the back frame body 1 are symmetrically provided with connecting shafts 102, and the connecting shafts 102 can be connected and fixed to the armrests of the chair by bolts or pins.

[0046] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A chair back frame, comprising a back frame body, characterized in that: A hinge seat is installed at the front of the main body of the back frame, and a pivot is installed on the hinge seat. The lumbar pillow is rotatably connected to the hinge seat through the pivot. A cylindrical helical torsion spring is fitted on the rotating shaft. The spring includes a helical coil. A first abutment end and a second abutment end are formed on the outer walls of both sides of the helical coil, extending radially outward. The first abutment end and the second abutment end are arranged in opposite directions. The first abutment end and the second abutment end abut against the upper ends of the hinge seat and the lumbar pillow respectively. When the lumbar pillow is pressed, it can rotate along the axis of rotation, and the included angle between the first and second abutting ends of the cylindrical helical torsion spring can change with the magnitude of the pressing force.

2. The chair back frame as described in claim 1, characterized in that: The hinged seat includes a seat plate and upright plates symmetrically arranged at both ends of the seat plate. The inner sidewalls of the two upright plates are symmetrically provided with slots, and each upright plate is provided with a first through hole that communicates with the slot. The two sides of the lumbar pillow are symmetrically provided with connecting plates, and the two connecting plates are symmetrically provided with second through holes. The two upright plates are placed between the two connecting plates, and the two ends of the rotating shaft are correspondingly placed into the slots of the two upright plates. The two connecting plates, the two upright plates and the rotating shaft are connected by fasteners.

3. The chair back frame as described in claim 2, characterized in that: The upper end of the seat plate is provided with a first spring insertion hole, which is located between the two upright plates; the upper end of the lumbar pillow is provided with two second spring insertion holes side by side; the first abutting end is located in the middle of the cylindrical helical torsion spring, and the first abutting end is inserted into the first spring insertion hole; there are two second abutting ends, which are symmetrically located at both ends of the cylindrical helical torsion spring, and the two second abutting ends are inserted into the two second spring insertion holes respectively.

4. The chair back frame as described in any one of claims 1 to 3, characterized in that: A recessed cavity is opened on the back of the main body of the back frame, and multiple screws are installed in the recessed cavity. The screws pass through the main body of the back frame to fasten the hinge seat. A decorative cover can be detached and installed in the recessed cavity.

5. The chair back frame as described in claim 4, characterized in that: The back frame and lumbar support have a hollow structure, and recessed grooves are provided on the outer perimeter of both the back frame and lumbar support for installing breathable mesh fabric; symmetrical connecting shafts are provided at both ends of the back frame for connecting and fixing to the chair.

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