Backrest structure for seat

Abstract

The utility model discloses a backrest structure for a seat, which comprises a back frame and a waist support, the upper end of the back frame is provided with a support frame extending downwards, and a first elastic support structure is arranged between the lower end of the support frame and the back frame; a receding groove is formed in the middle of the supporting frame, the waist support is arranged in the middle of the back frame, and the front end of the waist support extends into the receding groove and protrudes out of the front wall of the lower end of the supporting frame. In the actual design, the supporting frame is matched with the back frame, the upper end of the supporting frame is connected with the upper end of the back frame, the lower end of the supporting frame is movably connected with the back frame through the first elastic supporting structure, and meanwhile the waist support extends out of the front wall of the lower end of the supporting frame. The fit degree between the waist and the caudal vertebra and the fit degree between the supporting frame and the waist support are higher, and then the use experience is improved; in the actual design, the support frame is coated with the mesh cloth, so that the backrest is more breathable and comfortable.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of office chair, especially a backrest structure for a seat. BACKGROUND

[0002] Seat refers to various chairs equipped for work convenience in daily work and social activities. With human body design for sitting posture, ergonomic seat is also born, which provides bionic support for positions such as lumbar vertebrae or cervical vertebrae of human body, thereby reducing the load of human body, and thereby improving comfort, and avoiding sub-health problems caused by bad sitting posture.

[0003] The existing seat backrest, for example, Chinese patent 202322701610.1, the chair back support and keel support are vertically adjusted and matched, so when the waist is attached to the chair back support, the support is generally realized by the waist rest, so the support degree is relatively hard, and the comfort and adjustment range are relatively small. SUMMARY

[0004] The main purpose of the utility model is to provide a backrest structure for a seat, which can realize double-layer elastic support of the waist by adjusting the backrest structure, can realize bionic curvature of the human body, and can also provide more comfortable support feeling.

[0005] To achieve the above purpose, the utility model provides a backrest structure for a seat, which comprises,

[0006] The back frame is provided with a support frame extending downward at the upper end, and a first elastic support structure is arranged between the lower end of the support frame and the back frame;

[0007] The middle part of the support frame is provided with an empty slot;

[0008] The waist support is arranged in the middle part of the back frame, and the front end of the waist support extends into the empty slot and protrudes from the front wall of the lower end of the support frame.

[0009] In the actual design, the upper end of the support frame is connected with the upper end of the back frame, the lower end of the support frame is movably connected with the back frame through the first elastic support structure, and the waist support protrudes from the front wall of the lower end of the support frame, so that the attachment between the waist and the coccyx and the attachment between the support frame and the waist support are higher in the actual support, thereby improving the use experience;

[0010] In the actual design, the support frame is covered with a mesh cloth, so that the backrest is more breathable and comfortable. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is an exploded view of the utility model;

[0012] Figure 2The cross-sectional view of the utility model;

[0013] Figure 3 The utility model solid appearance Figure 1 .

[0014] Figure 4 The utility model solid appearance Figure 2 .

[0015] In the drawings,

[0016] 1 is back frame, 10 is support frame, 101 is side pole, 102 is upper pole, 103 is lower pole,

[0017] 21 is first top spring, 22 is second top spring, 23 is telescopic sleeve,

[0018] 3 is waist support, 30 is strip-shaped groove,

[0019] 4 is guide column, 41 is guide channel, 42 is connecting rod,

[0020] 5 is concave-convex part, 51 is limiting plate,

[0021] 61 is blocking part, 62 is limiting part,

[0022] 71 is guide sliding notch, 72 is guide sliding convex part,

[0023] 81 is first screw rod, 82 is second screw rod. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0025] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, …), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0026] In addition, if the description of "first" or "second" and the like is involved in the embodiments of the present application, the description of "first" or "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0027] As shown in Figures 1 to 4 A backrest structure for a seat, comprising,

[0028] A back frame 1, the upper end of the back frame 1 is provided with a support frame 10 extending downward, and a first elastic support structure is arranged between the lower end of the support frame 10 and the back frame 1.

[0029] The middle part of the support frame 10 is provided with a hollow groove;

[0030] A waist support 3 is arranged at the middle part of the back frame 1, and the front end of the waist support 3 extends into the hollow groove and protrudes from the front wall of the lower end of the support frame 10.

[0031] In the actual design, the upper end of the support frame 10 is connected with the upper end of the back frame 1, the lower end of the support frame 10 is movably connected with the back frame 1 through the first elastic support structure, and the waist support 3 protrudes from the front wall of the lower end of the support frame 10, so that the adhesion between the waist and the coccyx and the support frame 10 and the waist support 3 is higher in the actual support, thereby improving the use experience.

[0032] In the actual design, the support frame 10 is covered with a mesh cloth, so that the backrest is more breathable and comfortable.

[0033] Specifically, the first elastic support structure is a first top spring 21.

[0034] In the embodiments of the present application, the front wall of the back frame 1 is provided with a positioning groove, the rear end of the first top spring 21 is clamped in the positioning groove, the front end of the first top spring 21 is provided with a first screw hole, and the wall surface of the support frame 10 is provided with a first screw through hole, and a first screw rod passes through the first screw through hole and is screwed in the first screw hole.

[0035] The outer peripheral wall of the first top spring 21 is sleeved with an expansion sleeve 23, thereby facilitating the installation and fixation of the first top spring 21, and of course the specific installation structure can also be changed according to different products.

[0036] The telescopic sleeve 23 mainly plays a decorative role.

[0037] Specifically, the two sides of the support frame 10 are side rods 101, and the two side rods 101 are arranged in an arc shape and protrude forward. By arranging the side rods 101 in an arc shape and forward, the body on both sides can be covered, thereby improving the fitting degree and support to the back and improving the use experience.

[0038] In the embodiment of the utility model, the support frame 10 further includes an upper rod 102 and a lower rod 103, the upper rod is installed at the upper end of the back frame 1, and the lower rod is connected with the first elastic support structure.

[0039] The side rod 101 has a predetermined deformation degree, and of course the specific side rod 101 can also be a hard structure. In actual use, plastic molding is adopted, and the predetermined deformation degree can also improve the fitting degree.

[0040] Specifically, the back frame 1 is provided with a guide column 4, the guide column 4 is provided with a guide channel 41, the guide channel 41 is slidably installed with a connecting rod 42, the rear end of the connecting rod 42 is provided with a second top spring 22 between the back frame 1, and the front end of the connecting rod 42 is provided with the waist support 3.

[0041] Through the cooperation of the guide column 4 and the back frame 1, the installation of the connecting rod 42 is facilitated, and at the same time, the waist support 3 also has a predetermined elastic movement stroke, thereby improving the fitting degree between the lumbar vertebrae and the waist support 3.

[0042] In the embodiment of the utility model, the guide column 4 is provided with a second threaded hole, the back frame 1 is provided with a second threaded hole, a second screw rod is screwed in the second threaded hole after passing through the threaded hole, thereby realizing the installation of the guide column 4, and of course the specific guide column 4 can also be integrally formed with the back frame 1.

[0043] Specifically, the waist support 3 is provided with a strip-shaped groove 30, the front wall of the strip-shaped groove 30 is provided with a concave-convex part 5 arranged in the height direction, the front end of the connecting rod 42 is installed with a positioning plate abutting against the concave-convex part 5 after passing through the strip-shaped groove 30, and the positioning plate slides along the height direction of the strip-shaped groove 30, thereby realizing the height adjustment of the waist support 3.

[0044] In the embodiment of the utility model, the front end of the guide column 4 is provided with a blocking part 61 extending to the axial center direction, the blocking part 61 surrounds a limiting channel, the rear end of the connecting rod 42 is provided with a limiting part 62 matched with the blocking part, and the outer diameter of the limiting part is smaller than the inner diameter of the limiting channel, thereby realizing the limiting of the guide column 4.

[0045] Specifically, the blocking part is provided with a guide sliding gap 71, the limiting part is provided with a guide sliding convex part 72 matched with the guide sliding gap, thereby realizing the stable sliding of the connecting rod 42.

[0046] The above merely describes preferred embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation, or direct / indirect application in other related technical fields, under the inventive concept of the present application, using the content of the present application specification and drawings, is included in the patent protection scope of the present application.

Claims

1. A backrest structure for a seat, characterized in that, include, The back frame has a downwardly extending support frame at its upper end, and a first elastic support structure is provided between the lower end of the support frame and the back frame. The support frame is provided with a clearance groove in the middle; The lumbar support is located in the middle of the back frame, with its front end extending into the clearance groove and protruding from the front wall of the lower end of the support frame.

2. The backrest structure for a seat as described in claim 1, characterized in that: The first elastic support structure is a first top spring.

3. The backrest structure for a seat as described in claim 2, characterized in that: The front wall of the back frame is provided with a positioning groove, the rear end of the first top spring is engaged in the positioning groove, the front end of the first top spring is provided with a first screw hole, the wall of the support frame is provided with a first screw through hole, and a first screw passes through the first screw through hole and is screwed into the first screw hole. The outer peripheral wall of the first top spring is fitted with a telescopic sleeve.

4. The backrest structure for a seat as described in claim 1, characterized in that: The support frame has side bars on both sides, which are arranged to protrude forward in an arc shape.

5. The backrest structure for a seat as described in claim 4, characterized in that: The support frame also includes an upper rod and a lower rod, the upper rod being installed at the upper end of the back frame, and the lower rod being connected to the first elastic support structure; The side rod has a predetermined degree of deformation.

6. The backrest structure for a seat as described in claim 1, characterized in that: The back frame is provided with guide posts, the guide posts are provided with guide channels, the guide channels are slidably mounted with connecting rods, the rear end of the connecting rod is provided with a second top spring between it and the back frame, and the front end of the connecting rod is provided with the waist support.

7. The backrest structure for a seat as described in claim 6, characterized in that: The guide post is provided with a second threaded through hole, the back frame is provided with a second threaded hole, and a second screw passes through the threaded through hole and is screwed into the second threaded hole.

8. The backrest structure for a seat as described in claim 7, characterized in that: The waist support is provided with a strip groove, and the front wall of the strip groove has concave and convex parts on both sides along the height direction. The front end of the connecting rod passes through the strip groove and is fitted with a positioning plate that abuts against the concave and convex parts. The positioning plate slides along the height direction of the strip groove.

9. The backrest structure for a seat as described in claim 8, characterized in that: The front end of the guide post is provided with a stop extending in the axial direction, the stop forming a limiting channel, and the rear end of the connecting rod is provided with a limiting part that cooperates with the stop, the outer diameter of the limiting part being smaller than the inner diameter of the limiting channel.

10. The backrest structure for a seat as described in claim 9, characterized in that: The stop portion is provided with a guide notch, and the limiting portion is provided with a guide protrusion that cooperates with the guide notch.

Images