KR102320665B1 - Chair for Improving Lumbar Support Performance - Google Patents

Abstract

The present invention relates to a chair having improved lumbar supporting performance, comprising: a leg part consisting of a plurality of legs; a supporting part for connecting the leg part and a seat plate to enable rotation on a rotational axis; a back connecting frame for connecting the supporting part and a back of the chair; and a lumbar assembly mounted on the back connecting frame. The lumbar assembly consists of: a lumbar supporter having two wings extending in a vertical direction; a cam rotating axis having a multistage cam formed on the outer surface thereof; a cushion spring inserted into the cam rotating axis; a body configured so that the outer cylinder part, a ratchet gear and a depth adjustment knob of the lumbar supporter can be inserted into a cylinder part of the body; a ratchet gear having sawteeth configured to rotate in one direction; a depth adjustment member having a circular ring, a knob extending from the circular ring, and clasp hinged to the circular ring; and a finishing fixing member for preventing the separation of the depth adjustment member. The chair having improved lumbar supporting performance supports the lumbar of a seated person with the lumbar supporter adhering closely to the lumbar part of the seated person all the time when the seated person is seated on the seat plate, thereby significantly reducing the fatigue of the waist even if the person is seated on the chair for a long time.

Description

Chair for Improving Lumbar Support Performance

The present invention relates to a chair for improving lumbar support performance, and more particularly to a chair.

As modern people spend a lot of time sitting while working on a computer or studying for a long time, a chair with various functions to reduce the burden on the seat plate and backrest of the body is known as the chair is actually the closest to our body. In particular, a chair equipped with a lumbar support device in order to reduce fatigue of a backrest for supporting the spine, in particular, of the lower back has been widely used.

For example, in Utility Model Registration No. 20-0444359, a fixing part coupled to a backrest, a connecting member having a fastening piece part formed with a pair of locking protrusions protruding from both ends of the fixing part on the left and right sides, and on the back surface of each other in the vertical direction A lumbar support device for a chair having a lumbar support member having a pair of locking grooves arranged to be long and coupled to each other so that the pair of locking protrusions can move up and down, and a locking jaw that prevents the locking protrusions from departing in the vertical direction. In the present invention, it describes a lumbar support device formed so that the locking protrusion can be coupled to the locking groove portion by rotating in parallel with the horizontal line while in contact with the rear surface of the lumbar support member. In this utility model registration, the elastic part 15 having elasticity is fixedly coupled to the backrest to support the lumbar spine by the elasticity of the elastic part.

In addition, in Patent Registration No. 10-0886008, it consists of a fixed frame fixed to the backrest frame, and a support pad coupled to the fixed frame and moving up and down and back and forth; The fixed frame is provided with a first applied portion, and the support pad is provided with a second applied portion; The support pad describes a lumbar support device for a chair comprising left and right support portions extending to the left and right of the chair to support the lumbar spine, and lower support portions extending downward to support the user's upper hip. In this patent, the bevel gear and the adjustment cam are rotated as the front-back adjustment means 130, so that the pin 165 in close contact with the adjustment cam pushes the housing 162 forward, and the support pad 140 is placed on the lumbar spine and upper buttocks of the seated person. It is a structure that increases strength.

In addition, in Patent Registration No. 10-1188881, the lumbar support is connected and fixed to the back support by using a connector 14 having a rubber elastic portion 28 between the fixing part and the shaft, and the lumbar support is connected to the back support. It describes a lumbar support device for a chair that is configured to support the lumbar vertebrae while forming an opposite angle to the lumbar vertebrae by giving movement to the lumbar support according to the user's posture while reducing the number of parts and assembling man-hours. Also in this patent, the back support and the lumbar support are connected by a connector 14 having a rubber elastic part 28 between the synthetic resin fixing part and the shaft part.

As in the prior patent document, in the conventional lumbar support device, the lumbar support supports the lumbar vertebrae of the seated person with a rubber elastic body or manually adjusts the forward and backward movement depth with the fore-and-aft adjustment means. Since there are many cases where it is not supported continuously and it falls on the lumbar vertebrae, there are insufficient and insufficient points in terms of lumbar support performance.

Accordingly, there is a need for a chair for improving lumbar support performance for reducing fatigue of the lower back by supporting the lumbar vertebrae by always supporting the lumbar vertebrae in close contact with the lumbar vertebrae while the seated person sits on the seat plate.

Utility model registration No. 20-0444359 Registered Patent No. 10-0886008 Registered Patent No. 10-1188881

Accordingly, it is an object of the present invention to provide a chair for improving lumbar support performance for alleviating fatigue of the lower back by supporting the lumbar vertebrae by always in close contact with the lumbar vertebrae while the seated person sits on the seat plate.

As a result of research on the above problem, the present inventors have found that the above problem can be solved by providing a lumbar assembly having a specific configuration installed on a backrest connection frame, and have completed the present invention.

The above object is a lumbar support comprising a leg part made of a plurality of legs, a support part connecting the leg part and the seat plate so as to be rotatable through a rotation shaft, a back connection frame connecting the support part and the backrest, and a lumbar assembly mounted on the back connection frame Performance improvement is achieved by the chair.

The lumber assembly according to the present invention includes an outer cylindrical portion having a pair of straight protrusions formed on its inner surface along the longitudinal direction, an inner cylindrical portion formed concentrically with the outer cylindrical portion, and two vertically extending from one side of the outer cylindrical portion. Lumber supporters with wings; a cylindrical cam rotation shaft inserted into the outer cylindrical portion and having a multi-stage cam formed on an outer surface thereof, one end open and the other end closed cam rotation shaft having a polygonal protrusion to be inserted into a ratchet gear; a cushion spring inserted into the cam rotation shaft; A body cylinder having a C-shaped protrusion periphery formed to surround the outer periphery of the bottom surface, a first cutout formed under the periphery, and a second cutout extending through the bottom surface and having a part of the end cut out a body having an external cylindrical portion of the lumbar supporter, a ratchet gear, and a depth adjustment knob configured to be inserted into the cylindrical body; a ratchet gear having a polygonal groove on its bottom surface to be inserted into the protrusion of the cam rotation shaft, a plurality of semi-moon-shaped projections on its upper surface, and teeth configured to rotate in one direction on its outer peripheral surface; a depth adjusting member having a circular ring formed to surround the ratchet gear, a knob extending from the circular ring, a limit protrusion limiting rotation of the knob, and a catch hingedly coupled to the circular ring; And a bolt hole for fastening the bolt is formed to prevent separation of the depth adjusting member, and a finishing fixing member having a plurality of grooves formed on the inner surface to coincide with the half-moon-shaped protrusion.

The present invention also provides a chair for improving lumbar support performance as a preferred embodiment, wherein the lumbar assembly has sliding protrusions on both sides of the body for height adjustment, and a plurality of groove members are provided in the backrest connection frame. .

In addition, as another preferred embodiment, the present invention provides a chair for improving lumbar support performance in which multi-stage cams of the cam rotation shaft are formed in three or more stages.

As another preferred embodiment, the present invention provides a chair for improving lumbar support performance in which a tension spring is connected to a knob of a depth adjusting member and a protruding periphery of a body.

As another preferred embodiment of the present invention, in order to prevent the lumbar supporter from being separated from the body, a stopper is provided on the outer surface of the outer cylindrical part, and a slot of a certain length is provided in the body cylindrical part. Lumbar support performance Provides improved chairs.

As another preferred embodiment, the present invention provides a chair for improving lumbar support performance including a cover coupled to the closing fixing member in a clip-type manner.

In the chair for improving lumbar support performance according to the present invention, since the lumbar support is always in close contact with the lumbar vertebra to support the lumbar vertebrae while the seated person sits on the seat plate, it is possible to significantly reduce the fatigue of the lower back even when sitting in the chair for a long time.

1 is a perspective view from below of a chair for improving lumbar support performance according to the present invention.
2 is a perspective view of a lumbar assembly which is a main part of a chair for improving lumbar support performance according to the present invention.
3 is a rear view of the lumbar assembly, which is the main part of the chair for improving lumbar support performance according to the present invention.
4 is a cross-sectional view of a state in which the lumber assembly according to the present invention is coupled to the backrest connection frame.
Figure 5 is an exploded perspective view of the lumbar assembly for showing a state coupled to the back connection frame of the lumbar support performance improvement chair according to the present invention.
6 is an exploded view of the lumbar assembly, which is the main part of the chair for improving lumbar support performance according to the present invention.
7 is a view showing a coupling state of the front and rear depth adjusting means of the lumber assembly according to the present invention.
8 is an exploded view of the components of FIG. 7 .

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the drawings. However, the following embodiments are provided so that those of ordinary skill in the art can fully understand the present invention, and can be modified in various other forms, and the scope of the present invention is limited to the embodiments described below it's not going to be

1 is a perspective view from below of a chair for improving lumbar support performance according to the present invention.

The chair 1 for improving lumbar support performance according to the present invention, as shown in FIG. 1 , includes a leg part 2 and a seat plate so as to be rotatable through a leg part 2 made of a large number of legs and a rotation shaft 3 . It consists of a support part 5 for connecting (4), a backrest connection frame 7 for connecting the support part 5 and the backrest 6, and a lumbar assembly 100 mounted on the backrest connection frame 7 . Since all components except for the lumber assembly 100 are known, a detailed description of the known components will be omitted.

As shown in FIGS. 1 and 5, the lumbar assembly 100 mounted on the chair 1 for improving lumbar support performance of the present invention is mounted on the backrest connection frame 7 to the waist of the seated person, especially the lumbar ( lumbar).

The lumber assembly 100 of the present invention largely includes a lumber supporter 10 , a cam rotation shaft 20 , and a cushion spring 30 . It consists of a body 40, a ratchet gear 50, a depth adjustment member 60, and a finishing fixing member 70.

As shown in detail in FIGS. 2 to 6 , the lumbar supporter 10 has two wings 14 and 14' that extend vertically so as to support the lumbar vertebrae in a wide range. The lower wing 14 ′ is preferably wider than the upper wing 14 .

4 and 6, the outer cylindrical portion 12 is extended by a predetermined length in the center of the two wings 14 and 14', and the outer cylindrical portion 12 has a concentric circle therewith. As a result, the inner cylindrical portion 13 is formed shorter than the outer cylindrical portion 12 .

And, as shown in FIG. 6 , a pair of straight protrusions 11 are formed on the inner surface of the outer cylindrical portion 12 in the longitudinal direction.

A cam rotation shaft 20 is inserted into the outer cylindrical portion 12 , and a multi-stage cam 21 is symmetrically formed on an outer surface of the cam rotation shaft 20 . Although described in this specification as three stages, more stages are also possible.

In addition, one end of the cam rotation shaft 20 is open and the other end is closed, and a polygonal protrusion 22 is formed to be inserted into a polygonal recess (not shown) formed in the center of the ratchet gear 50 , have.

A cushion spring 30 is inserted into the cam rotation shaft 20 so that the lumbar supporter 10 is always in close contact with and supports the lumbar vertebrae. As shown in detail in FIG. 4 , the cushion spring 30 is accommodated in the cam rotation shaft 20 in a state of being seated on the end of the inner cylindrical portion 13 of the lumbar supporter 10 .

As shown in detail in FIG. 6 , the body 40 has a C-shaped protruding periphery 42 formed to surround the outer periphery of the bottom surface 41 , and the knob 62 is moved under the periphery 42 . The first cutout 43 is formed so as to be, and the body 40 has a body cylindrical portion 44 in the center thereof. The body cylindrical portion 44 extends through the bottom surface 41 so that the outer cylindrical portion 12 of the lumber supporter 10, the ratchet gear 50, and the depth adjustment knob 62 are inserted. . In addition, the body cylindrical portion 44 has a second cut-out portion 47 in which a portion of the end portion is cut to limit the movement of the limit protrusion 65 .

In the center of the ratchet gear 50, a polygonal groove is formed on the bottom to be inserted into the protrusion 22 of the cam rotation shaft 20, and there are a plurality of semi-moon-shaped protrusions 51 on the upper surface, and the outer circumferential surface has one It has teeth configured to rotate in the direction (see FIG. 7).

In addition, as shown in detail in FIGS. 7 and 8 , the depth adjustment member 60 extends outwardly from the circular ring 61 formed to surround and accommodate the ratchet gear 50 , the circular ring 61 . a knob 62 , a limit protrusion 65 for limiting rotation of the knob 62 , and a catch 63 hingedly coupled to the circular ring 61 .

Finally, a bolt hole for fastening a bolt is formed in order to prevent separation of the depth adjusting member 60, and a plurality of grooves (not shown) formed to match the half-moon-shaped protrusion 51 on the inner surface of the finish fixing The member 70 is bolted to the body 40 .

As a preferred embodiment of the present invention, for the elevating and lowering of the lumber assembly 100, a plurality of groove members 8 are formed in the backrest connection frame 7, and sliding protrusions ( 45), so that the height of the lumbar assembly 100 can be adjusted as needed.

In addition, as another preferred embodiment, a tension spring 64 is connected to the knob 62 of the depth adjusting member 60 and the protruding periphery 42 of the body 40 to release the force applied to the knob 62 . By pulling the tension spring 64 , the depth adjusting member 60 is rotated to return to its original position.

2 and 6, in order to prevent the lumbar supporter 10 from being separated from the body 40, a stopper 16 is provided on the outer surface of the outer cylindrical part 12, And the body cylindrical portion 44 is provided with a slot 46 of a certain length.

As shown in FIG. 6 , a cover 80 configured to be coupled to the closing fixing member 70 in a clip manner is provided.

Hereinafter, when sitting, the operation of the chair 1 for improving lumbar support performance according to the present invention will be described.

First, the body 40 of the lumbar assembly 100 is adjusted up and down to fit the body shape of the seated person to adjust the height.

Then, when the knob 62 of the lumbar assembly 100 is turned clockwise, the circular ring 61 of the depth adjusting member 60, the ratchet gear 50, and the cam rotation shaft 20 rotate together, at this time The distance at which the lumbar supporter 10 can move backward can be adjusted in three steps of the multi-stage cam 21 by the rotational movement of the cam rotation shaft 20 .

When the knob 62 is operated to the maximum rotatable range, the ratchet gear 50 and the cam rotation shaft 20 are closed to coincide with the half-moon-shaped protrusion 51 and the half-moon-shaped protrusion 51 on the upper surface of the ratchet gear 50 . It is operated only in one direction by the groove formed on the inner surface of the fixing member 70 and is fixed without further rotation. When the force applied to the knob 62 is released, the depth adjusting member 60 rotates and returns to its original position by pulling the tension spring 64 . At this time, the locking member 63 assembled to the depth adjustment member 60 is naturally pushed into the teeth along the inclined surface teeth of the ratchet gear 50, and when the depth adjustment member 60 returns to its original position, it is pushed back with its own elasticity. comes out

If the process so far is repeated, the rear movement depth of the lumbar supporter 10 is adjusted step by step in the order of large → medium → small → medium → small → medium, giving a strong sense of support at the final limit position for each step, and the movable range Always maintains the cushion with the lumbar spine in close contact despite the seated person's movement.

The most important performance of the chair 1 for improving lumbar support performance according to the present invention is that the lumbar supporter 10 always supports the lumbar part despite the movement of the seated person in a state where the depth is adjusted to fit the body shape of the seated person. However, the conventional lumbar supporter often falls without supporting the lumbar part when the seated person moves, so the lumbar support performance is insufficient.

As mentioned above, although preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various modifications can be made by those skilled in the art within the scope of the technical spirit of the present invention. This is possible.

1: Chair 2: Leg
3: axis of rotation 4: seat plate
5: Support part 6: Backrest
7: Backrest connection frame 8: No groove member
10: lumbar supporter 11: protrusion
12: outer cylindrical portion 13: inner cylindrical portion
14,14': wing 16: stopper
20: cam rotation shaft 21: multi-stage cam
22: protrusion 30: cushion spring
40: body 41: bottom surface
42: protruding periphery 43: first cutout
44 body cylindrical portion 45: sliding projection
46: slot 47: second cutout
50: ratchet gear 51: half-moon projection
60: depth adjustment member 61: circular ring
62: knob 63: catch
64: tension spring 65: limit protrusion
70: finish fixing member 80: cover
100: lumbar assembly

Claims (6)

The leg part 2 made of a number of legs, the support part 5 that connects the leg part 2 and the seat plate 4 so as to be rotatable through the rotation shaft 3, and the support part 5 and the backrest 6 are connected. A chair (1) for improving lumbar support performance comprising a backrest connection frame (7), and a lumbar assembly (100) mounted on the backrest connection frame (7),
An outer cylindrical portion 12 having a pair of straight protrusions 11 formed on the inner surface along the longitudinal direction, an inner cylindrical portion 13 concentric with the outer cylindrical portion 12, and the outer cylindrical portion 12 Lumber having two wings (14, 14') extending up and down from one side of supporter (10) ;
A cylindrical cam rotation shaft 20 inserted into the outer cylindrical portion 12 and having a multi-stage cam 21 formed on its outer surface, one end open and the other end closed to be inserted into the ratchet gear 50. A polygonal protrusion ( 22) is formed cam rotation shaft 20 ;
a cushion spring 30 inserted into the cam rotation shaft 20;
The C-shaped protrusion perimeter 42 formed to surround the outer periphery of the bottom surface 41, the first cutout 43 formed under the protrusion perimeter 42, and the bottom surface 41 extend through the A body (40) having a body cylindrical portion (44) having a second cutout portion (47) having a second cutout portion (47) cut off at an end thereof, the outer cylindrical portion (12) of the lumbar supporter (10), a ratchet gear (50) and a body 40 configured such that the depth adjustment knob 62 is inserted into the body cylindrical portion 44;
The cam rotation shaft 20 has a polygonal groove on its bottom to be inserted into the protrusion 22, a plurality of semi-moon-shaped protrusions 51 on its upper surface, and a ratchet gear 50 having teeth configured to rotate in one direction on the outer peripheral surface;
A circular ring 61 formed to surround the ratchet gear 50, a knob 62 extending from the circular ring 61, a limit protrusion 65 for limiting rotation of the knob 62, and the circular ring Depth adjustment member (60) having a catch (63) hingedly coupled to (61); and
A bolt hole for bolting is formed in order to prevent separation of the depth adjusting member 60, and a finishing fixing member 70 having a plurality of grooves formed on the inner surface to match the half-moon-shaped protrusion 51 is included. A chair (1) for improving lumbar support performance. The method of claim 1,
Lumbar support, characterized in that the lumbar assembly 100 has sliding protrusions 45 on both sides of the body 40 for height adjustment, and a plurality of groove members 8 are provided in the backrest connection frame 7 . Performance improvement chair (1). The method of claim 1,
A chair (1) for improving lumbar support performance, characterized in that the multi-stage cam (21) of the cam rotation shaft (20) is formed in three or more stages. The method of claim 1,
A chair (1) for improving lumbar support performance, characterized in that a tension spring (64) is connected to the knob (62) of the depth adjustment member (60) and the protruding periphery (42) of the body (40). The method of claim 1,
In order to prevent the lumbar supporter 10 from being separated from the body 40 , a stopper 16 is provided on the outer surface of the outer cylindrical portion 12 , and a slot of a certain length is provided in the body cylindrical portion 44 . (46) lumbar support performance improvement chair (1), characterized in that provided. The method of claim 1,
Lumbar support performance improvement chair (1), characterized in that it comprises a cover (80) coupled to the closing fixing member (70) in a clip type.

Images