KR200447375Y1 - An arm rest for chair - Google Patents

Abstract

The present invention relates to a chair armrest, and in detail, the holding portion (7) having a bent portion up and down separately and then combined to significantly reduce the manufacturing cost, and adjust the height of the chair armrest (1), Multi-stage rotation of the armrest portion 9 and configured to be able to slide back and forth in multiple stages to facilitate use.

Chair armrest, button, prop, armrest, armrest, slide, rotation, adjusting rod

Description

Armrest for chair {AN ARM REST FOR CHAIR}

The present invention relates to a chair armrest, which allows the long length of the holding part to be separated and assembled to be assembled up and down to allow for partial replacement and to reduce the manufacturing cost, and to be configured so that the armrest can be adjusted in height and rotated in multiple stages and back and forth. It is intended for ease of use.

In general, armrests for chairs have a fixed part formed at the bottom to be mounted on both sides of the seat plate of the chair, a vertical support part is formed at the upper part of the fixed part, and an arm support part is formed at the upper part of the vertical support part, thereby providing various functions such as height and rotation. Is provided but inconvenient to use and has a complicated configuration.

In addition, the conventional armrest is configured to operate the height of the armrest portion by installing a slide-type button on the upper side of the support, but there is a difficult operation.

In addition, the conventional armrest is a push type button on the upper side of the support when operating the height of the armrest portion of the structure by using the locking piece of the button to directly lock or release the locked state a lot of force in operation There was a problem inconvenient to use.

In addition, the conventional armrest has a problem that the lifting stroke of the holding portion is low to satisfy the various body conditions of the user.

In addition, the conventional armrest has a problem that the holding part is made in one piece using a single mold, not only increases the weight and volume of the mold, but also requires a lot of demolding time, curing time, and manufacturing cost, and is partially broken or worn. Even if the entire holding part needs to be replaced, there was a problem such as a drop in compatibility and an increase in maintenance costs.

The present invention is characterized by providing a chair armrest for manufacturing cost is greatly reduced by separating and holding the holding portion provided with the bent up and down and then assembled.

Another object of the present invention is characterized by providing an armrest for a chair in which the height adjustment of the armrest and the multistage rotation of the armrest and the multistage sliding back and forth are achieved.

Another object of the present invention is characterized in that the lifting stroke becomes longer (20 mm or more).

Another object of the present invention is characterized in that the height adjustment is easy to adjust the height of the armrest using the control rod that is rotated forward and backward by the push-type button.

Another object of the present invention is characterized by providing a chair armrest with excellent compatibility by allowing a partial replacement by configuring the armrest and the upper support and the lower support.

Another object of the present invention is characterized in that it is easy to replace the holding portion and the armrests to easily replace the armrests of various designs.

The present invention is a fixed part fixed to the chair, the bent portion is bent upward on one side of the fixing portion, the holding portion protruding upwards in the bent portion, the outer cylinder is coupled to the upper and lower height of the holding portion and the outer cylinder It is installed on the upper side and consists of an armrest that slides back and forth in multiple stages and rotates in multiple stages about an axis.

The strut is separated and molded into an upper strut provided with a downward protrusion and a lower strut formed with a downward recess, and then assembled and manufactured by combining the protrusion and the recess to reduce the cost and time.

In addition, the present invention is a downward projection formed in the lower portion of the upper support, a downward recess groove formed in the bent portion to be coupled to the projection, the bolt hole formed in the recess and the groove, respectively, bolt hole formed in the upper support A nut insertion groove formed at an upper portion, a protrusion coupled to the recessed groove, a bolt and a nut for firmly fixing the lower support, a stepped portion formed at a lower portion of the bolt hole so that the head of the bolt can be caught, and the bolt head It is composed of a cap coupled to the lower bolt hole so that the part is not exposed to the outside.

The present invention has the effect of significantly reducing the manufacturing cost because the length of the upper column and the lower column is separated and then completed assembly.

In addition, the present invention has the effect of adjusting the height of the armrest, multi-stage rotation of the armrest and sliding back and forth in multiple stages.

In addition, the present invention has the effect of satisfying the user's various body shape because the length of the holding portion is about 20 mm longer than the conventional armrest, as well as the lifting stroke is also longer than the conventional.

In addition, the present invention has a simple and easy effect of adjusting the height than the conventional armrest by adjusting the height of the armrest by using a control rod that rotates forward and backward by the push-type button.

In addition, the present invention is a very useful design that can be replaced by the armrest part and the upper support and the lower support can be replaced partially, not only excellent compatibility, but also can easily replace the armrest of a variety of designs .

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the embodiments of the present invention, the same elements in the drawings are denoted by the same reference numerals as much as possible, and detailed descriptions of related known configurations or functions will be omitted so as not to obscure the subject matter of the present invention.

Figure 1 is an overall perspective view of the armrest for chair 1 of the present invention, Figure 2 is a perspective view of a state in which the lower strut is removed and Figure 3 is a cross-sectional view, the height of the armrest is adjusted in multiple stages by the height adjustment means operated by a button In addition, it is provided with the convenience of sliding in multiple stages back and forth by the sliding means, the plane rotation in multiple stages about the axis by the rotating means.

The chair armrest 1 of the present invention is fixed to the seat plate and / or the assembly portion of the chair 2, the bent upwardly bent on one side of the fixing portion 2, and protrudes upward A support portion 7, an outer cylinder 8 coupled to the upper portion of the support portion 7, the height of which is adjusted by a height adjustment means, and an arm support portion 9 are installed on the outer cylinder 8 so as to be easily replaced. do.

The support 7 is divided into an upper support 11 and a lower support 3 so as to be divided into molds and assembled in order to reduce cost, and a downward protrusion 12 formed below the upper support 11. A downward recessed groove 13 and a fastening member are formed in the bent portion so that the protrusion 12 can be coupled thereto, and the arm rest portion 9 that can be easily replaced is fastened to the fixing plate of the upper support 11. .

Thus, in case of partial breakage or wear, partial replacement, such as lower strut 11 or upper strut 3 or arm rest 9, can be replaced respectively, thereby reducing maintenance costs, in particular the arm rest 9 It has the advantage that it can be replaced with finished in various designs and various colors.

Bolt holes 14 and 15 respectively formed in the recess 13 and the protrusion 12, the nut 16 insertion groove 17 formed in the upper bolt hole 14 and the recess 13 Bolts 15 and nuts 19 for firmly fixing the projection 12 coupled to the lower support 3, and the lower part of the bolt hole 15 so that the head 20 of the bolt 18 can be caught. The cap 22 is formed at the lower portion of the bolt hole 15 so that the stepped portion 21 and the head 20 are not exposed to the outside.

Accordingly, the nut 16 is coupled to the insertion groove 17 of the upper pillar 11 separately formed, and then the downward protrusion 12 is coupled to the recess groove 13 of the lower pillar 11, and the upper and lower pillars 11 are formed. When the bolts 18 are inserted into the bolt holes 14 and 15 respectively formed at the upper and lower portions 3, and the bolts 18 are fastened to the nuts 16, the upper and lower struts 11 are caught while the head part 20 is caught by the step portion 21. Tight coupling of (3) is achieved.

The nut 16 insertion groove 17 is opened to one side of the protrusion 12 so that the nut 16 can be easily inserted, and a finger insertion groove 23 is formed at the top to easily couple the nut 16. In the fixing part 2, a plurality of piece holes 25 in which the stepped part 24 is formed to be fixed to the seat plate and / or the assembly part of the chair using a piece (not shown) or the like are vertically or inclined.

The nut insertion groove 17 and the finger insertion groove 23 are located at approximately the middle of the protrusion 12, and when the upper and lower struts 11 and 3 are coupled to each other, the nut insertion groove 17 and the finger insertion groove 23 are not exposed to the outside. Do not.

The upper strut 11 coupled to the outer cylinder 8 is coupled to a length enough to contact the lower strut 3 as shown in FIG. 3, and the upper strut 11 is attached to the upper body 11 as shown in FIG. 4. Height adjustment means that can adjust the height of the armrest portion 9 to fit is installed.

That is, the through hole 28 is formed so that the height adjustment rod 27 in the upper support (11) can be elevated. Through the through hole 28 it is possible to save the injection material and reduce the weight of the product while maintaining the strength.

A plurality of projections 29 are formed on the upper outer surface of the upper support 11 in the longitudinal direction to maintain a distance or a predetermined gap 30 with the outer cylinder 8 coupled to the upper support 11, thereby maintaining the projections. Since the contact between the outer circumferential surface of the upper support 11 and the inner circumferential surface of the outer cylinder 8 is prevented by maintaining the spacing of the 29, direct friction and wear between the inner circumferential surface of the upper support 11 and the inner circumferential surface of the outer cylinder 8 are prevented. This prevents malfunction or noise.

In addition, as shown in FIG. 6, even if the upper inner circumferential surface of the outer cylinder 8 directly contacting the protrusion 29 is worn out, the deterioration of aesthetics is prevented.

5 is a perspective view of a state in which the fixing plate 26 installed on the upper portion of the outer cylinder 8 of the present invention is disassembled, and the fixing plate 26 is coupled to the coupling portion 31 formed at the upper end of the outer cylinder 8, It is fastened to the piece 32 and is firmly fixed, the arm support 9 is installed on the support shaft 33 formed in the center of the upper surface of the fixing plate 26.

The pieces 32 are fastened to the screw holes 31a positioned in the coupling part 31, respectively, and an outward protrusion 26a is formed at one side of the fixing plate 26 to prevent the rise of the button 35. The upper part of the button 35 is also covered.

The coupling portion 31 is circular or elliptical, and the planar area of the outer cylinder 8 is extended to improve the force (supporting force) for supporting the armrest portion 9.

The height adjusting means is fixed to the bottom surface of the fixing plate 26 by a plurality of pieces 34. The height adjusting means is configured to adjust the height of the armrest 9 by the operation of the button 35 protruding out of the outer cylinder (8).

When the armrest (1) for the chair in the present invention is mounted on the chair, the upper portion of the support portion 7 and the outer cylinder 8 is configured to be gradually inclined toward the front (front) (approximately 15 °), and the outer cylinder ( 8) The fixing plate 26 installed on the upper portion is installed horizontally, whereby the armrest 9 is maintained in a horizontal state.

The main reason for installing the holding portion 7 and the outer cylinder 8 to be inclined gradually toward the front side (front) is to fix the fixing portion 2 to a firm fixing position of the chair, and the armrest portion 9 supports the armrest. It is intended to be in a proper position (located in front of the fixing part 2 position) below, and of course, the overall aesthetics are also considered.

The outer cylinder 8 is coupled to the upper and lower struts 11 and 3 coupled in the present invention, so that the lifting stroke of the armrest 9 is about 20 mm or more longer than conventional armrests.

In addition, in the case of the conventional armrest, a plurality of engaging grooves of the inclined structure and the engaging piece coupled to the engaging grooves are held in the support, and the lifting stroke is low, but in the present invention, the plurality of engaging pieces 43 and the engaging grooves are designed. (44) is coupled to the adjustment rod (27) formed alternately to the lower support (3), but by the push-type button (35) maintains or locks the locking state by the forward or reverse rotation of the control rod (27) Because the configuration to release the state can be used easily without great effort.

In addition, if you want to extend the length of the height of the stroke is easily achieved by replacing the adjusting bar 27 with the locking piece 43 and the locking groove 44 is increased.

Figure 6 is an external perspective view of the height adjustment means, the fixing body 36 is fastened to the bottom surface of the fixing plate 26, the adjusting rod 27 and push coupled to the stationary body (36) A button 35, a spring 37 for returning the button 35, a long hole 38 formed in the flat portion 35a of the button 35 so that the button 35 can move, and the long hole The shaft portion 39 of the upper portion of the control rod 27 coupled to the 38, the auxiliary shaft 40 protrudes upwardly away from one side of the shaft portion 39, and the button 35 to which the auxiliary shaft 40 is coupled. The shaft hole 41 of the flat portion 35a, the flat portion 42 formed in the longitudinal direction of the adjusting rod 27, the plurality of engaging pieces 43 formed at predetermined intervals on one side of the flat portion 42 and , A locking groove 44 formed between the locking pieces 43, a locking protrusion 45 formed at a lower end of the adjusting rod 27, a flat portion 46 formed at one side of the locking protrusion 45, and A plurality of pieces 47 at the upper end of the upper support 11 It is composed of a locking plate 48 is fastened to the) and the locking hole 49 of the semi-circular or semi-circular shape is formed in the center of the locking plate 48 to be coupled to the adjustment rod 27.

One side of the locking hole 49 is formed with a flat portion 50 to which the locking groove 44 is coupled and locked.

The thickness of the locking plate 48 is a little thinner than the height of the locking groove 44, that is, the separation distance between the locking pieces 43, so that the locking groove 44 smoothly flows in and out.

Using the flat portion 46 formed on the lower locking portion 45 of the adjustment rod 27 is coupled to the locking hole 49, the flat portion 42 is in contact with the flat portion 42 of the locking plate 48 Rotating so that the locking protrusion 45 is caught by the locking plate 48 while the height and protrusion of the outer cylinder 8 and the upper support 11 are adjusted, but separation is prevented.

Spring chambers 51 and 52 to which the springs 37 are coupled are formed at one side of the button plane portion 35a and the bottom of the fixing body 36, respectively, and the spring 37 is separated at one side of the fixing body 36. The support plate 53 which prevents is formed.

Of course, the spring chamber 37 may be formed only on one side of the button plane portion 35a or the fixture 36.

Guide portions 54 and 55 for guiding both sides of the button plane portion 35a are formed in parallel on both sides of the bottom surface of the fixing body 36, and a recessed groove 56 to which the shaft portion 39 is coupled is formed in the center portion. Is formed, the shaft portion 39 is coupled to the recess groove 56 is configured to be axially coupled to the fixed body 36 by the piece 57 to be rotated forward and backward.

Outside the guide parts 54 and 55, threaded holes 58 and 59 are formed to be fastened to the bottom surface of the fixing plate 26 by pieces 34.

The locking plate 48 is fastened with a piece 47 at the upper end of the upper support 11, and the adjusting rod 27 is coupled to the inside of the through hole 28 formed in the upper support 11.

The adjustment bar 27 coupled to the locking hole 49 rotates forward and backward by the button 35, and the locking or locking of the locking piece 43 is released according to the forward and reverse rotation state. That is, as shown in FIG. 9, when the button 35 is pressed in the direction of the arrow, the auxiliary shaft 40 rotates about the shaft portion 39 and the adjustment rod 27 rotates clockwise so that the flat portion of the adjustment rod 27 is rotated. Since the flat portion 50 of the 42 and the engaging plate 48 is in contact with each other or in surface contact, the height can be adjusted, and the height of the armrest 9 is appropriately adjusted by adjusting the height of the adjustment bar 27. It can be adjusted.

When the height adjustment is completed and the button 35 held down is released, as shown in FIG. 10, as the button 35 is returned by the elastic force of the spring 37, the auxiliary shaft 40 moves and moves about the shaft portion 39. Adjustment bar 27 is rotated in a counterclockwise direction so that the locking groove 44 of the adjustment bar 27 is located in the flat portion 50 of the locking hole 49, the locking is achieved in a height-adjusted state.

As described above, the armrest part 9 is height-adjusted by height-adjusting means, rotates in multiple stages by rotating means described later, and is configured to slide back and forth in multiple stages by sliding means.

11 is a bottom exploded perspective view of the arm rest portion 9 provided with the rotating means and the sliding means of the present invention, the sliding means is as follows.

A slide plate 61 having a long hole 60 formed therein so that the shaft portion 33 of the fixed plate 26 can be coupled, a slide member 75 coupled to the engaging groove 62 of the slide plate 61, and a slide member. (75) The one side holding pieces 63, 64 and the other side holding pieces 65, 66, and one side holding pieces 63, 64 and the other holding pieces 65, 66, which are symmetrically installed on both sides of the bottom face, are provided. Spring members 67 and 68 which are respectively supported, and the slide member 75 so that the one side tack piece 63, 64, the other side tack piece 65, 66 and the spring 67, 68 can be coupled. Coupling holes 69, 70 formed on both sides of the bottom and the shaft hole 73 is projected downwardly coupled to the bottom of the rotating body 72 is coupled to the recessed groove 71 of the slide member 75 ( 74).

The shaft portion 33 of the fixing plate 26 is coupled to the long hole 60 to move along the long hole 60 in accordance with the sliding state of the arm support 9, a pair of both sides in the longitudinal direction of the coupling groove 62 Guides 76 and 77 are formed.

The inner surface of the guide portion 76, 77 is gentle so that the curved surfaces 63a, 64a, 65a, 66a of the blotter pieces 63, 64, 65, 66 can be recessed. The curved recesses 78, 79 and the protrusions 80, 81 are alternately formed at predetermined intervals, and therefore, each of the holding pieces 63, 64 supported by the springs 67, 68, respectively. The sliding positions of the arm rests 9 are determined as the 65 and 66 are engaged with the recesses 78 and 79, and the holding members 63, 64 and 65 are moved as the arm rests 9 are moved. The sliding member 75 is moved while the crest 66 is moved, and multistage sliding of the armrest 9 is achieved. Concave grooves 82 and 83 are formed at both sides of the sliding member 75, respectively.

The rotating means is as follows.

The rotating body 72 coupled to the recessed groove 71 of the sliding member 75 is formed with protrusions 84 and 85 that gradually narrow toward both sides, and has a through-hole through which the shaft piece 86 passes. (87) is formed, the spring chamber 90 (91) to which the springs (88) and (89) are coupled to the bottoms of the projections (84) (85) and the holding paper (92) coupled to the spring (88) (89). Insertion grooves 94 and 95 are formed to be inserted into the (93), respectively, and the holding pieces (92, 93) protrude out of the protrusions (84, 85).

A plurality of curved recesses 96 and 97 and protrusions 98 and 99 are formed at predetermined intervals on both sides of the recessed groove 71 so as to be curved surfaces 92a and 93a of the tack pieces 92 and 93. ), And the indentations 96 and 97 and the protrusions 98 and 99 are positioned on an arc line around the shaft hole 74, and the shaft hole 74 is disposed at the bottom thereof. A plurality of protrusions 100 having different arc radii are formed at the center thereof, so as to reduce the coefficient of friction between the rotating body 72 and the bottom surface of the recessed groove 71.

Accordingly, the respective sliding pieces 92 and 93 supported by the springs 88 and 89 are locked to the concave portions 96 and 97, respectively, so that the sliding positions of the arm rests 9 are determined. 9, the rotator 72 moves forward or reverse about the shaft piece 86 as the tack pieces 92 and 93 move, thereby achieving multi-stage rotation of the armrest 9. .

The rotating body 72, the sliding member 75, and the slide plate 61 are coupled to the support shaft 33 by the shaft piece 86, and the upper armrest portion 9 is mounted on the support plate 33. Coupling member 101 is fixed to a plurality of pieces (102). An accommodating groove 104 is formed in the center portion of the coupling member 101, and a plurality of threaded rods 103 are formed at the edge portion thereof to which the pieces 102 are fastened. Is implied.

In the present invention, the arm rest portion 9 directly contacting the user's body is formed of a soft material (or foaming agent) while being tough, such as urethane, and the coupling member 101 on which the arm rest portion 9 is fixed or supported is ABS. It is hard, such as resin, and the armrest portion 9 and the coupling member 101 may be bonded or integrally molded with an adhesive.

FIG. 13 is a perspective view of the arm rest portion 9 being slid to the rear side, and FIG. 14 is a perspective view of the arm rest portion 9 being slid forward.

Figure 15 shows the multi-stage rotation state of the present invention armrest portion 9, (A) is a perspective view of the armrest portion 9 is rotated in a counterclockwise direction, (B) is the armrest portion (9) (C) is a perspective view of the state in which the armrest part 9 was rotated clockwise.

The present invention can be partially replaced because it consists of the arm rest portion 9 and the upper strut 11 and the lower strut 3, in particular, the arm rest portion 9 as shown in Figure 12 is the shaft portion 33 of the fixing plate 26 It is fastened to the shaft piece (86), and when the slide plate 61 is separated from the arm rest portion (9), the shaft piece (86) is easily exposed, so the replacement of the arm rest portion (9) is easy. Therefore, the armrest 9 of various designs can be easily replaced.

The present invention has the effect of significantly reducing the manufacturing cost because the length of the upper column and the lower column is separated and then completed assembly.

In addition, the present invention has the effect of adjusting the height of the armrest, multi-stage rotation of the armrest and sliding back and forth in multiple stages.

In addition, the present invention has an effect that satisfies the user's various body shape because the lifting stroke is longer than the conventional.

In addition, the present invention has a simple and easy effect of adjusting the height than the conventional armrest by adjusting the height of the armrest by using a control rod that rotates forward and backward by the push-type button.

In addition, the present invention is a very useful design that can be replaced by the armrest part and the upper support and the lower support can be replaced partially, not only excellent compatibility, but also can easily replace the armrest of a variety of designs .

The present invention as described above is not limited to the present embodiment and the accompanying drawings, various substitutions, modifications and changes are possible within the scope without departing from the technical spirit of the present invention, which is usually in the art It is self-evident for those who have knowledge.

1: a perspective view of the present invention.

2 is a perspective view of the upper and lower struts separated from the present invention.

3 is a cross-sectional view of the present invention.

4 is a cross-sectional view of the upper post and the outer cylinder are coupled in the present invention.

5 is a perspective view of the state in which the fixing plate of the outer cylinder upper part in the present invention.

Figure 6 is a perspective view of the height adjustment bar is removed in the present invention.

7 is a plan view and a front view of the height adjustment bar in the present invention.

8 is an exploded perspective view of the control rod and the button support in the present invention.

9 is a cross-sectional view of the release state of the locking bar by pressing the button in the present invention.

10 is a cross-sectional view of the state in which the button is returned to the control rod is caught in the present invention.

11 is a bottom exploded perspective view of the armrest of the present invention.

12 is a plan exploded perspective view of the armrest of the present invention.

13 is a bottom perspective view of the slide state of the present invention armrest.

14 is a bottom perspective view of the slide state of the present invention armrest.

15: the bottom perspective view of the multi-stage rotating state of the present invention armrest,

(A). The armrest is rotated counterclockwise.

(B). The armrest is not rotated.

(C). The armrest is rotated clockwise.

<Explanation of symbols for the main parts of the drawings>

(1)-chair armrest (2)-government

(3)-Lower Shore (7)-Household

(8)-Outer tube (9)-Forearm

(11)-Upper Shore (12)-Protrusion

(13)-Indentation Groove (14) (15)-Bolt Ball

(16) (19)-Nut (17) (23)-Inserting groove

(18)-Bolt (20)-Head

(21) (24)-Joint (22)-Cap

(25)-piece ball (26)-holding plate

(27)-Adjustment Rod (28)-Vertical

(30)-Gap (33) (39) (73)-Shaft

(35)-button (35a) (42) (46) (50)-plane

(36)-fixation (37) (67) (68) (88) (89)-spring

(40)-Secondary Shaft (43)-Jagged

(44)-Jang groove (45)-Jangdol

(47) (57) (102)-Piece (48)-Hanging Plate

(49) (59)-Job Ball (51) (52)-Spring Seal

(54) (55)-Guide (56) (71) (82) (83)-Indentation groove

(58) (59)-Threader (60)-Longsmith

(61)-Slide Plate (62) (69) (70)-Mating Groove

(63) (64) (65) (66) (92) (93)-Attractor

(63a) (64a) (65a) (66a) (92a) (93a)-curved surface

(75)-Slide Member (72)-Rotator

(74)-Soccer (78) (79) (96) (97)-Indentation

(80) (81) (84) (85) (98) (99)-protrusion (86)-shaft piece

(87)-Ventilation (90) (91)-Spring Seal

(94) (95)-insertion groove (100)-protrusion

(101)-engagement member (103)-napton

Claims (12)

A fixing part fixed to a chair, a bending part bent upward on one side of the fixing part, a support part protruding upward from the bending part, and an outer cylinder coupled to an upper part of the support part and height-adjusted by a height adjusting means; In the armrest for chair consisting of a multi-stage sliding movement forward and backward from the upper portion of the outer cylinder by a sliding means and a multi-stage planar rotation around the axis by a rotating means; Downward projection 12 formed in the upper support 11, the recessed groove 13 of the bent portion is coupled to the projection 12, the bolt hole formed in the recessed groove 13 and the projection 12 ( 14, 15, the nut 16 formed in the upper part of the bolt hole 14, the insertion groove 17, the projection 12 is coupled to the concave groove 13, the upper support 11 and the lower support ( 3, the bolt 18 and the nut 19 to fix the bolt, the stepped portion 21 formed below the bolt hole 15 so that the head portion 20 of the bolt 18 can be caught, and the head portion ( 20) chair armrest consisting of a cap 22 is coupled to the bottom of the bolt hole 15 so as not to be exposed to the outside. delete delete The method according to claim 1; The nut 16 insertion groove 17 is open to one side of the downward protrusion 12, the armrest for the chair by forming a finger insertion groove 23 on the insertion groove 17. delete delete delete delete delete delete delete delete

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