KR101274582B1 - Secondary backrest of chair - Google Patents

Abstract

PURPOSE: A secondary backrest for a chair is provided to be movably coupled to a pair of rails equipped in a backrest and selectively hung on an uneven part on the rail, thereby freely controlling the height of a support mounted to an up and down movable part. CONSTITUTION: A secondary backrest(3) for a chair(1) comprises a support frame(9) which is connected to a chair coupled to a backrest(4); an up and down movable part(11) which is coupled to the support frame to move up and down; a back and forth tilting part(13) which is coupled to be hinge-coupled to a lower part and allows an upper part to rotate clockwise or counterclockwise; a first elastic member(15) which is arranged between the up and down movable part and the back and forth tilting part and elastically pressurizes the back and forth tilting part; and a support plate(17) which is located in the back and forth tilting part, has elasticity, and elastically supports a back side.

Description

Secondary backrest of chair

The present invention relates to an auxiliary backrest device for a chair, and more particularly, to an auxiliary backrest device for a chair that can be mounted on the backrest so as to be movable back and forth and up and down to effectively support a waist.

In general, the chair is composed of a back support for supporting the user's back, a seat supporting the hips of the user, and a leg supporting the seat.

In recent years, attempts have been made to diversify the functions of chairs. As an example, chairs equipped with auxiliary backrests have been developed. In other words, office workers or students are sitting on a chair for a long time, so that the back tired easily, a backrest is required.

An example of such an auxiliary backrest is disclosed in Patent Registration No. 10-1148032 (name: lumbar support device of the chair).

The prior art has a structure that supports the waist by moving the support pad coupled to the fixed frame of the backrest in the vertical and vertical directions by the front and rear adjustment means and the vertical adjustment means.

And, the front and rear adjustment means, the cam is formed on one side, the front and rear adjustment knob portion is integrally operable on the outer peripheral surface, and is disposed on the inclined surface of the cam and coupled to the support pad side, the cam It consists of a pin for moving the support pad in the front and rear direction while moving along the inclined surface during the rotation.

In addition, the vertical adjustment means includes a rail provided in the fixing frame, and a bracket provided on the support pad and formed to be engaged with the rail to move in the vertical direction.

However, such a conventional auxiliary backrest has a problem in that the structure of the means for moving back and forth and the means for moving up and down is complicated, which takes a long assembly time and increases the manufacturing cost.

Patent Application No. 10-2011-135215 (Name: Lumbar support device of chair)

In order to solve such a problem, the present invention is to provide an auxiliary backrest device of the chair that can support the user's waist stably by improving the structure, freely moving forward and backward and up and down.

In order to achieve the above object, an embodiment of the present invention includes a support frame connected to a chair provided with a backrest;

An up and down moving part coupled to the support frame to be movable up and down;

A front and rear tilting part in which a lower part is hingedly coupled to the vertical moving part so that the upper part rotates along a trajectory in a clockwise and counterclockwise direction about the lower part;

A first elastic member disposed between the vertical moving part and the front and rear tilting part to elastically press the front and rear tilting part in the backrest direction; And

It is provided on the front and rear tilting portion, and includes a support plate for elastically supporting the back of the back of the mesh material by having elasticity.

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As described above, the auxiliary backrest device of the chair according to the embodiment of the present invention has the following advantages.

First, the guider of the up-and-down moving part is movably coupled to a pair of rails provided on the backrest, and the up-and-down moving part is selectively locked to the uneven part formed in the rail by pressing the locking piece laterally by the spring. The height of the support plate mounted on the vertical moving part can be adjusted freely.

Second, by engaging the lower portion of the front and rear tilting portion by the hinge pin and elastically supporting the backrest by the spring, the support plate of the front and rear tilting portion rotates along the trajectory in the clockwise and counterclockwise directions about the lower portion of the user. The waist can be elastically supported.

Third, the back of the chair is formed of a mesh-shaped mesh material, and the front and rear tilting portions supporting the back of the back from the rear are supported by the elastic member, and the support plate itself is formed of a material having elasticity, so that when the user sits on the chair The waist can be elastically supported by the support plate and the triple support by the elastic member.

1 is a perspective view showing a chair having an auxiliary back according to an embodiment of the present invention.
2 is a side view of FIG. 1.
3 is an enlarged perspective view illustrating the auxiliary backrest illustrated in FIG. 1.
4 is an exploded perspective view of the auxiliary backrest shown in FIG. 3.
FIG. 5 is a rear exploded perspective view of the auxiliary backrest shown in FIG. 3.
FIG. 6 is a plan view schematically illustrating a state in which a engaging piece provided in the vertical moving part of the auxiliary backrest illustrated in FIG. 3 is coupled to a rail of the backrest while being supported by a spring.

Hereinafter, with reference to the accompanying drawings, the auxiliary back support device of the chair according to the present invention will be described in detail.

As shown in Figures 1 and 2, the chair (1) with an auxiliary backrest proposed by the present invention includes a backrest (4) for supporting the user's back; A seat 5 supporting the hip part of the user; A leg 7 supporting the seat 5; And an auxiliary back 3 provided on the back 4 to support the waist.

In a chair having such a structure, the seat 5 and the leg 7 have a conventional structure.

In addition, the legs 7 may be variously changed in structure. For example, the legs 7 may be simple legs having four rod shapes, or may be provided with wheels and are movable. Alternatively, the legs may be omitted if necessary.

The backrest 4 is made of a fiber material having elasticity, preferably a mesh-shaped mesh material. Therefore, when the user sits on the chair, the back is elastically supported by contacting the backrest so that the user can feel the elasticity.

In addition, when the auxiliary backrest 3 mounted at the rear of the chair 1 supports the backrest 4 from the rear, the backrest 4 is made of a mesh material so that the back of the user sitting on the chair 1 may be elastically supported. Can be.

The auxiliary back 3 is mounted on the back of the back 4, and has a structure that is movable up and down and back and forth to support the user's waist.

The auxiliary backrest 3 includes a support frame 9 connected to the chair 1 provided with the backrest 4 as shown in FIGS. 3 to 6; An up and down moving part 11 coupled to the support frame 9 so as to be movable up and down; A front and rear tilting portion 13 which rotates along a trajectory in a clockwise and counterclockwise direction around the lower portion by being hingedly coupled to the upper and lower moving parts 11; A first elastic member 15 disposed between the up and down moving part 11 and the front and rear tilting part 13 to elastically press the front and rear tilting part 13 toward the backrest 4; And a support plate 17 provided on the front and rear tilting part 13 to support the backrest 4 and having elasticity.

In the auxiliary backrest having the above structure, the support frame 9 is formed with a screw hole 19 in the lower portion. In addition, the bolt is penetrated through the screw hole 19 of the support frame 9 to the backrest 4 so that the support frame 9 may be coupled to the backrest 4.

Of course, the auxiliary backrest 3 has been described as screwed to the backrest 4 of the chair 1, but the present invention is not limited thereto, and may be changed to various coupling methods such as welding.

In addition, the pair of rails 23 and 25 are disposed in the vertical direction on the front surface of the support frame 9 so that the vertical movement part 11 can be slidably coupled in the vertical direction. .

The pair of rails 23 and 25 are disposed to face each other at a predetermined interval. In more detail, the pair of rails 23 and 25 may include a first rail 23 disposed vertically on the front surface of the support frame 9; A second rail 25 disposed in a side-by-side direction away from the first rail 23 by a predetermined distance; It is formed on the inner surface of the first and second rails (23, 25), respectively, and includes an uneven portion 27 which is selectively caught by the vertical movement portion (11).

The uneven portions 27 are formed on inner surfaces of the first rail 23 and the second rail 25, that is, surfaces facing each other. The uneven portion 27 has a structure in which the concave portion 31 and the convex portion 29 are sequentially formed.

Therefore, the up-and-down moving part 11 can stop at a predetermined height by selectively locking the engaging piece 49 of the up-and-down moving part 11 mentioned later to this recessed part 31 and the convex part 29. As shown in FIG.

The vertical movement unit 11 includes a base 33 which is coupled to the pair of rails 23 and 25 so as to be movable up and down; A guider (35) formed concave on both sides of the base (33) and movably coupled to the pair of rails (23, 25), respectively; A second elastic member 37 disposed on the front surface of the base 33; A hook piece 49 connected to the second elastic member 37 and projecting outward through a guider 35 to be caught by a pair of rails 23 and 25; A handle 41 provided on the base 33 is included.

The guider 35 has a concave groove 43 on the side of the base 33, that is, when the base 33 is disposed between the pair of rails 23 and 25, and faces the rails 23 and 25. This is the structure that is formed. At this time, the concave groove 43 is formed to a predetermined depth on the side of the base 33 is formed long along the longitudinal direction.

The width L of the concave groove 43 formed in the guider 35 is formed longer than the width L1 of the rails 23 and 25.

Therefore, a pair of rails 23 and 25 are inserted into the recessed groove 43, and when the external force is applied, the vertical moving part 11 may move in the vertical direction.

In addition, since the through hole 45 is formed at a predetermined position of the concave groove 43 formed in the guider 35, the locking piece 49 may protrude to the outside through the through hole 45.

The second elastic member 37 is disposed in the receiving groove 47 formed in the base 33. In this case, the second elastic member 37 preferably means a compression spring. Of course, the second elastic member 37 is not limited to the compression spring, but also synthetic resin having elastic force, such as rubber.

In addition, the receiving groove 47 is preferably formed in the transverse direction with respect to the base (33). Therefore, the second elastic member 37 mounted in the accommodation groove 47 is also disposed in the transverse direction with respect to the base 33 to elastically support the locking piece 49 in the outward direction.

The locking pieces 49 are mounted at both ends of the second elastic member 37, and protrude outwards through the through holes 45 of the guider 35. At this time, the locking piece 49 is in a state of being elastically supported by the second elastic member 37 so as to elastically contact the pair of rails 23 and 25.

The side surface of the locking piece 49 corresponds to the uneven portion 27 on the rails 23 and 25 by forming the curved portion 49.

Therefore, the curved portion 49 may be fixed to a predetermined position by contacting the recessed portion 31 of the rail in a state in which the locking piece 49 is elastically supported by the second elastic member 37.

In this state, when the locking piece 49 is caught by the recess 31, when an external force is applied to move the vertical movement part 11 upward or downward, the curved portion 49 of the locking piece 49 In the state in contact with the recess portion 31 of the rail, the sliding portion 29 is moved to the next recess portion 31 while making sliding contact.

In this manner, the locking piece 49 may move over the predetermined number of recesses 31 and the convex part 29 to a target position.

As a result, when the user grasps the handle 41 and raises or lowers the up and down moving part 11 upward or downward, the locking piece 49 is selectively caught by the uneven part 27 of the rail, thereby moving up and down at a predetermined height. The moving unit 11 may be located.

On the other hand, the front and rear tilting portion 13 is elastically supported by a torsion spring on the front surface (chair direction) of the vertical movement portion 11 can be moved forward and backward along the rotation trajectory.

In more detail, the front and rear tilting part 13 includes a pair of support brackets 52 protruding from the base 33 of the vertical movement part 11; A tilting bar 54 hingeably coupled to the pair of support brackets 52 and variable in the front and rear directions; It includes a projecting bracket (56) protruding from the lower rear of the tilting bar 54 and rotatably connected to the support bracket (52).

In the front-back tilting part 13 having such a structure, the pair of support brackets 52 protrude from both sides of the front surface (chair direction) of the base 33, respectively. In addition, the pair of support brackets 52 may be spaced apart from each other by a tilting bar 54 therebetween.

In addition, a pair of support brackets 52 are each formed with a first through hole 58, and the first through hole 58 corresponds to the second through hole 60 of the tilting bar 54, which will be described later. Therefore, the fastening member 62, such as a bolt, is fastened to the first through hole 58 by passing through the second through hole 60 so that the tilting bar 54 can be hinged to the base 33 of the vertical moving part 11. Can be combined.

The tilting bar 54 has a pair of protruding brackets 56 protruding rearward from the bottom thereof, and the second through hole 60 is formed in the pair of protruding brackets 56 respectively.

In addition, the pair of protruding brackets 56 are disposed between the pair of support brackets 52, wherein the first through holes 58 and the second through holes 60 correspond to each other, so that the fastening member ( 62) can be hingedly connected.

As such, since the tilting bar 54 has a structure in which the lower portion is hingedly connected to the vertical movement part 11, the tilting bar 54 may rotate at a predetermined angle along the circular trajectory in the front and rear direction around the lower portion.

The first elastic member 15 may support the user's waist by elastically pressing the tilting bar 54 forwardly (chair direction).

This first elastic member 15 preferably means a torsion spring. That is, the first elastic member 15 includes: a first end 66 fixed by being caught by a fixing bracket 64 protruding from the front surface of the base 33; A second end portion 68 connected to the tilting bar 54 to support elastically; And a coil portion 70 disposed between the first and second ends 66 and 68 to provide an elastic force.

In the first elastic member 15 having such a structure, the first ends 66 are preferably composed of a pair. Then, the pair of first ends 66 are fixed to the two fixing brackets 64 protruding on the base 33. In this way, the first elastic member 15 is composed of a pair of the first end portion 66 can support the tilting bar 54 more stably.

In addition, the second end 68 is elastically supported on the rear surface (opposite the chair) of the tilting bar 54.

Therefore, in the state where the first end 66 is fixed to the base 33, the second end 68 may elastically press the rear surface of the tilting bar 54 in all directions.

As a result, when the user's back contacts the support plate 17, the external force acts backward by pushing the support plate 17, and the first elastic member 15 is contracted by the external force to act as a repulsive force. It can elastically support the back.

Meanwhile, at least one accommodating groove 72 is formed at an upper portion of the tilting bar 54, and the accommodating groove 72 corresponds to the fastening hole 74 formed in the support plate 17. Accordingly, the support plate 17 may be fixed to the tilting bar 54 by the bolt B passing through the fastening hole 74 and fastening to the receiving groove 72 of the tilting bar 54.

The support plate 17 is in contact with the back of the back 4 of the chair 1. At this time, the support plate 17 is formed of a material having elasticity.

Therefore, when the user sits on the chair 1, the support plate 17 supports the user's back with the backrest 4 interposed therebetween. At this time, the backrest 4 has elasticity because it is a mesh material as described above.

As a result, when the user sits on the chair, the support plate 17 may elastically support the backrest by the first elastic member 15.

Hereinafter, a process in which the auxiliary backrest elastically supports the back of the user according to an embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

As shown in Figs. 1 to 6, when the user sits on the chair 1, the back of the user is in contact with the front surface of the backrest 4 (toward the user). As described above, when the user's back contacts the front of the backrest 4, an external force acts rearwardly, and the external force is transmitted to the support plate 17 through the backrest 4 made of a mesh mesh material.

When an external force is transmitted to the support plate 17, the support plate 17 is pushed backward, and the upper portion of the tilting bar 54 rotates by an angle in a clockwise direction. At this time, the lower portion of the tilting bar 54 is in a state of being elastically supported in all directions by the first elastic member 15, that is, the torsion spring.

Therefore, when the upper portion of the tilting bar 54 rotates clockwise, the elastic force of the torsion spring acts as a repulsive force, thereby gradually cushioning the external force acting on the backrest 4 by the user.

As a result, the user can sit comfortably even when working for a long time by sitting on the chair 1 because the waist is primarily supported by the elastic force of the torsion spring.

As such, the tilting bar 54 primarily supports the user's back and the support plate 17 elastically supports the user's back.

In this state, when it is desired to adjust the height of the support plate 17 in the vertical direction, the height can be adjusted by appropriately operating the vertical movement part 11.

If this process is described in more detail, when the height of the support plate 17 is to be adjusted, first, the handle 41 of the up and down moving part 11 is pulled upward or pushed downward.

When the handle 41 is pressed upward or downward in this manner, the base 33 is also pressed upward and downward.

At this time, the locking piece 49 of the up and down moving part 11 is in a state of being caught by the uneven portion 27 of the rail by being elastically supported laterally by the second elastic member 37.

In this state, when the handle 41 is pulled up or pushed up or down as described above, the engaging piece 49 caught on the recessed portion 31 of the rail moves upward or downward to make sliding contact with the convex portion 29. While riding over the iron 29 to move to the neighboring recess 31.

In this way, the locking piece 49 is sequentially moved along the uneven portion 27, the user releases the force acting on the handle 41 when the support plate 17 reaches the appropriate height.

Then, when the force acting on the handle 41 is released, the locking piece 49 stops at the position of the recess 31 of the rail hanging at that time. Accordingly, the vertical movement part 11 may be fixed at the target position, and the support plate 17 may also be fixed at the same height.

In this way, the auxiliary back 3 according to the present invention can support the user's back more effectively by the mutual movement of the front and rear tilting unit 13 and the up and down moving unit 11.

As described above, when the user sits on the chair, the support plate 17 may elastically support the user's back by contacting the back of the backrest 4.

1: chair 3: auxiliary backrest
4: backrest 9: support frame
11: Up and down moving part 13: Front and rear tilting part
15: first elastic member 17: support plate

Claims (7)

A support frame connected to a chair provided with a backrest;
An up and down moving part coupled to the support frame to be movable up and down;
A front and rear tilting part in which the lower part is hingedly coupled to the up and down moving part so that the upper part rotates along the locus in a clockwise and counterclockwise direction about the lower part;
A first elastic member disposed between the vertical moving part and the front and rear tilting part to elastically press the front and rear tilting part in the backrest direction; And
It is provided in the front and rear tilting portion, and includes a support plate for elastically supporting the back of the back of the mesh material by having elasticity,
The support frame is slidably coupled to the vertical moving part by a pair of rails are arranged in the vertical direction on the front (chair direction),
The pair of rails includes a first rail disposed vertically on the front surface of the support frame; A second rail disposed in a side-by-side direction away from the first rail by a predetermined distance; The auxiliary backrest of the chair, which is formed on the inner surface of the first and second rails, respectively, and includes an uneven portion to which the vertical moving part is selectively caught. delete The method of claim 1,
The vertical moving part includes: a base disposed between the pair of rails; A guider formed concave on both sides of the base and movably coupled to the pair of rails, respectively; A second elastic member disposed on the front surface of the base; A engaging piece which is connected to the second elastic member and protrudes to the outside through the guide hole of the guider and is caught by the pair of rails; An auxiliary backrest device for a chair comprising a handle provided on the base. The method of claim 3, wherein
The second elastic member is a compression spring, the auxiliary backrest of the chair, characterized in that it is disposed in the receiving groove of the base to elastically support the locking piece in the lateral direction. The method of claim 3, wherein
The engaging piece is a secondary backrest of the chair, characterized in that the hook portion is selectively caught by the uneven portion by forming a curved portion. The method of claim 3, wherein
The front and rear tilting part includes a pair of support brackets protruding from the vertical moving part; A tilting bar that is hingedly coupled to the pair of support brackets and is variable in the front and rear directions; A protruding bracket protruding from the rear of the tilting bar and rotatably connected to the support bracket,
An auxiliary backrest device of a chair in which the tilting bar is hingedly coupled by fastening the first and second holes formed in the support bracket and the protruding bracket sequentially. The method according to claim 6,
The first elastic member includes: a first end fixed to the fixing bracket protruding from the base front surface of the vertical moving part; A second end connected to the tilting bar and elastically supported; An auxiliary backrest of a chair comprising a coil portion disposed between the first and second ends to provide an elastic force.

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