JP2014128741A - Armrest device for chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure high support strength even when an arm body in each armrest device is made of resin in a chair where the armrest device is fixed to a base.SOLUTION: A base 2 includes: a box shape base body 19 with an upward opening; a first metal fitting 20 for holding a bush 26 in cooperation with the base body 19; and second metal fittings 21 held between the first metal fitting 20 and the base body 19. Each arm body 9 includes an insertion part 15 to be fitted to the inside of the base 2. A part enclosed by the first metal fitting 20 and the second metal fitting 21 is allowed to be an arm attachment hole 14. The insertion part 15 of the arm body 9 is inserted to the arm attachment hole 14. The arm body 9 has a swelling part 16. The swelling part 16 is fastened to the second metal fitting 21 by a screw.

Description

  The present invention relates to a chair having an armrest device.

  Various mounting structures for armrest devices have been proposed for chairs. As an example, Patent Document 1 discloses that a duct-like support member that opens to the left and right is fixed to the lower surface of a seat plate, and a base end portion of an armrest device is inserted into this support member. In Patent Document 1, a hook is provided at the base end portion of the armrest device. When the base end portion is fully inserted into the support member, the hook engages with the locking means of the support member, and the armrest device is detached from the support member. Held impossible.

CD-ROM of Japanese Utility Model Publication No. 6-82954

  In patent document 1, since the base end part of an armrest device penetrates into a support member deeply, there exists an advantage which can obtain high support strength. However, since a duct-like support member is separately prepared and fixed to the seat plate, the support member protrudes downward from the lower surface of the seat plate, and thus the support member may be exposed to impair the aesthetics. is there.

  The present invention has been made to improve the current situation.

  The invention of claim 1 is a chair comprising a base fixed to the upper end of a leg post, and a seat, a backrest, and an armrest device supported by the base, wherein the base has elbow mounting holes opened on both the left and right sides thereof. On the other hand, the armrest device has an insertion portion that fits into the elbow mounting hole of the base and an overhanging portion that hits the side surface of the base, and the overhanging portion is fastened to the base with a screw.

  The invention of claim 2 embodies claim 1, and in this invention, the left and right elbow mounting holes in the base are in communication with each other. It is possible to fit deeply into close proximity.

  The invention of claim 3 embodies claim 1 or 2, and in this invention, the base has a base body that opens upward and a base body that overlaps with an insertion portion of the armrest device from above. A first metal fitting disposed inside, and a second metal fitting disposed inside the base main body so as to overlap the insertion portion of the armrest device from below, the first metal fitting and the second metal fitting being a base While fixed to the main body, the upper end portion of the leg post is fitted into a bush, and the bush is fixed to the base main body and the first metal fitting.

The base of the chair has a sturdy structure due to the function of supporting the seat and the backrest, and the armrest device of the present invention is such that the insertion part is fitted into the base of the strong structure and the overhanging part is a screw. By being fastened to the base, the armrest device is firmly supported even when a large load is applied to the armrest device. The elbow mounting hole is provided in the base itself, and the insertion part of the elbow body enters the base, so there is no loss of aesthetics (if the armrest device is not installed, the elbow mounting hole is closed with a cap. It's all right, and in this case, the beauty will not be lost.)

  Now, there are two types of armrest devices: a fixed type with a fixed height of the armrest and a movable type that can adjust the height of the armrest. In the case of a mold, an elbow rest is attached to a main body having an elbow strut integrally or separately so that the height can be adjusted. In most cases, the fixed type is made of synthetic resin, and the main body is often made of synthetic resin even if it is a movable type.

  And although the synthetic resin is inferior in strength compared to a metal such as aluminum die-casting, if the present invention is used, the load per unit area can be dispersed by lengthening the insertion portion, so the main body portion including the insertion portion Even if it is made of a synthetic resin, a high support strength can be secured. Therefore, it can be said that the present invention is particularly effective when the entire armrest device or the main body is made of resin.

  If the structure of Claim 2 is employ | adopted, since the insertion part on either side can be inserted deeply, support strength can be raised further. In this case, as shown in the embodiment, when the insertion portions of the left and right armrest devices are integrally connected with the connection pins, there is an advantage that the left and right insertion portions are in a state of reinforcing each other and the support strength can be further improved. .

  Moreover, if the structure of Claim 3 is employ | adopted, since an elbow attachment hole can be comprised using the 1st metal fitting required in order to attach a leg support | pillar, the number of members can be suppressed and it can contribute to a cost reduction.

It is an external view of the chair which concerns on embodiment, (A) is a front view, (B) is a side view. It is a perspective view in the state where an armrest device was separated. It is a separation perspective view of a base. The perspective view of a principal part, (A) is the figure seen from the top, (B) is the figure seen from the downward direction. It is a separate perspective view of the principal part. (A) is the perspective view in the state which attached the armrest apparatus, (B) is the perspective view which looked at the base from back. It is a figure which shows a modification.

  Next, an embodiment of the present invention will be described with reference to the drawings. The present invention is applied to a swivel chair frequently used for office work. In the following description, the front / rear / left / right wording is used to specify the direction, which is defined as the front direction of the seated person on the basis of the person normally seated in the chair. The front view direction is a direction opposite to the seated person, and the rear view direction is a direction when the seated person is viewed from behind.

(1). Outline of chair As shown in FIGS. 1 and 2, the chair is a leg device displaying only the leg strut (gas cylinder) 1, a base 2 fixed to the upper end of the leg strut 1, and disposed above the base 2. The seat 3 has a backrest 4 arranged behind the seat 4. An armrest device 5 is attached to the base 3. 1 and 2, only one of the armrest devices 5 is displayed, but a pair of left and right is attached.

The backrest 5 has a basic structure in which a back plate (inner shell) 7 is fixed to a back frame 6, and a cushion body 8 is stretched on the front surface of the back plate 7. The back frame 6 is connected to the base 2 so as to be able to tilt backward. When the backrest 4 tilts backward, the seat 3 moves upward while moving upward. That is, the seat 3 is attached to the base 2 via the intermediate member, and the seat 3 moves relative to the base 2. Since these locking mechanisms are irrelevant to the present invention, description thereof is omitted.

  The armrest device 5 has an elbow body 9 that is substantially L-shaped in front view and an elbow rest 10 that is adjustable in height. The elbow body 9 has a horizontally long arm portion 11 and an elbow strut 12 extending upward from one end thereof, and an elevating body 13 is mounted on the elbow strut 12 so that the height can be adjusted. A pad 10 is attached. The elbow post 12 and the arm portion 11 may be made of different members.

  The base 2 is formed with elbow mounting holes 14 opened on the left and right outer sides thereof. On the other hand, the arm portion 11 of the elbow body 9 is integrally formed with an insertion portion 15 that fits into the elbow mounting hole 14 of the base 2 and an overhang portion 16 that overlaps the outer surface of the base 2. It is fixed to the base 2 with screws 17. Details will be described below.

(2) Details of the main part As shown in each figure in FIG. 3 and subsequent figures, the base 2 is composed of a box-shaped base body 19 that opens upward, and one of the interiors of the base body 19 that is disposed at a rearward position. The first metal fitting 20 and a pair of left and right second metal fittings 21 disposed between the front half of the first metal fitting 20 and the base body 19 are provided. These are made of steel plates. The first metal fitting 20 has front and rear foot pieces 22 and is formed in a U-shape opening downward in a side view, and a regulating piece 23 provided on the foot piece 22 is fitted in an engagement hole 24 formed in a bottom plate of the base body 19. Positioning.

  The first metal fitting 20 is fixed to the base body 19 by welding. A concentric leg hole 25 is formed in the bottom plate of the base main body 19 and the first metal fitting 20, and a bush 26 is fitted into the leg hole 25, and the bush 26 is welded to the base main body 19 and the first metal fitting 20. doing. The leg support 1 is fitted to the bush 26 from below. The insertion portion 15 of the elbow body 9 is held at the front portion of the first metal fitting 20 so as not to move upward.

  The second metal fitting 21 has a side plate 21 a that overlaps the inner surface of the base 2 and a horizontal portion that extends inward from the upper end thereof. An inward burring portion 27 is formed on the side plate 21a and a female screw is formed on the burring portion 27 (a nut may be welded). The side plate 21 a of the second metal fitting 21 is exposed to the outside from a rectangular window hole 28 formed in the base body 19, and the screw 17 can be screwed into the burring portion 27 through the window hole 28. The side plate 21 a of the second metal fitting 21 is welded to the inner surface of the base body 19.

  The insertion portion 15 of the elbow body 9 is supported from below by the second metal fitting 22. In other words, a holding part that sandwiches the insertion part 15 of the elbow body 9 from above and below is formed by the first metal fitting 20 and the second metal fitting 21, and most of the elbow mounting hole 14 is configured by this holding part. Yes. The left and right elbow mounting holes 14 communicate with each other in series through the space in the base 2. Further, in the window hole 28 of the base body 19, a portion above the upper surface of the second metal fitting 21 constitutes the elbow mounting hole 14. A side regulating piece 29 protruding inward is formed at the inner edge of the window hole 28 by bending. The insertion portion 15 of the elbow body 9 can also be held by the side regulating piece 29 so that it cannot be displaced forward and backward.

  A downward downward piece 31 is formed on the opposite side of the second metal member 21 from the side plate 21 a, and the lower piece 31 is fitted in an engagement hole 33 formed in the land portion 32 of the base body 19. Thereby, the height of the first metal fitting 20 is accurately defined.

The second metal fitting 21 is formed with a pair of front and rear upward pieces 21b, and the first metal piece 21 is supported from below by the upward pieces 21b. The distance between the first metal fitting 20 and the second metal fitting 21 is defined by the upward piece 21b, and the insertion portion 15 of the elbow body 9 is held so that it cannot be displaced back and forth. Further, an upward restricting tongue piece 34 projects from the upward piece 21b, while the first metal fitting 2
0 is formed with an engagement hole 35 into which the upward restricting tongue piece 34 is fitted, so that the relative position between the first metal fitting 20 and the second metal fitting 21 is accurately defined. The first metal fitting 20 and the second metal fitting 21 are integrated by welding.

  For example, as shown in FIG. 4 (B), the overhanging portion 16 of the elbow body 9 in the armrest device 5 protrudes greatly downward from the insertion portion 15, and a recess 36 that opens downward and outward is formed in the overhanging portion 16. However, consideration is given so that the head of the screw 17 is hidden in the recess 36. Further, the insertion portion 15 has an opening at its distal end surface and has a pin hole 37. As shown in FIG. 3, the base body 19 is covered with a cover 40 from below.

  The insertion portions 15 of the left and right armrest devices 5 can be deeply fitted so as to come into contact with each other, and it is preferable that they are so deeply fitted. In this case, it goes without saying that the insertion portion 15 is set at a position so as not to buffer the bush 16.

(3). Summary As described above, the armrest device 5 is said to insert the insertion portion 15 of the elbow body 9 into the elbow mounting hole 14 of the base 2 and then screw the screw 17 into the burring portion 27 of the second metal fitting 21. It is firmly fixed to the base 2 by a simple operation. In this state, the insertion portion 15 is sandwiched from above and below by the first metal fitting 20 and the second metal fitting 21, and the overhanging portion 16 overlaps the side surface of the base 2, thereby providing high support strength. Is secured.

  As shown by a one-dot chain line in FIG. 6, the insertion portions 15 of the left and right armrest devices 5 can be integrally connected by inserting pins 38 into the pin holes 37. Then, since the left and right insertion portions 15 are reinforced and integrated with each other, the support strength can be further improved. In particular, it is particularly preferable to connect the left and right insertion portions 15 with the pins 37 in a state where they are closely fitted or close to each other so that the sense of unity between both insertion portions 15 is enhanced.

  The insertion portion 15 is firmly fitted in the elbow mounting hole 14 formed by the first metal fitting 20 and the second metal fitting 21, and the load acting on the armrest device 5 mainly acts as a moment with respect to the insertion portion 15. Since it acts to press the overhanging portion 16 against the side surface of the base 2, the armrest device 5 can be firmly fixed even by fastening with only one screw 17.

  When the armrest device 5 is not attached, the elbow attachment hole 14 is closed with a cap (not shown). The insertion portion 15 of the elbow body 9 has a mountain shape when viewed from the side, but it can be formed in a simple quadrilateral shape or a kamaboko shape.

(4). Modification (Fig. 7)
FIG. 7 shows a modification. Among these, (A) is a modification of the second metal fitting 21, the left and right second metal fittings 21 are set so as to be in close contact with each other, and a downward piece 21 d is formed at the tip. In addition, reinforcing pieces 21a that are in contact with the lower surface of the base 2 are integrally provided at both front and rear ends of the side plate 21a and at the lower end. For this reason, the side plate 21a can be held so as not to bend, and as a result, the support strength of the armrest device 5 is remarkably increased.

FIG. 7B is an example of a lid device that closes the elbow attachment hole 14 when the armrest device 5 is not attached. That is, in this example, a lid main body 42 having a hole communicating with the window hole 27 is fitted into the window hole 27 of the base 2, and the lid plate 43 is detachably attached to the lid main body 42. The lid main body 42 has locking claws 42 a, 42 b, 42 c for locking to the base 2. The lid body 42 is always attached to the base 2. The base 2 to which the lid main body 43 is attached is different from the embodiment of FIGS. 1 to 6, and the left and right frames are fixed to the lower surface, and the lid main body 43 is largely swung upward so as not to interfere with the frame. It has been.

(4). Others The present invention can be embodied in various ways other than the above embodiments. For example, the base can be a die-cast product.

  The present invention is useful when applied to a chair. Therefore, it can be used industrially.

DESCRIPTION OF SYMBOLS 1 Leg support 2 Base 3 Seat 5 Armrest device 9 Elbow main body 14 Elbow mounting hole 15 Elbow main body insertion part 16 Elbow main body overhanging part 17 Screw 19 Base main body 20 First metal fitting 21 Second metal fitting 26 Bush 37 Pin hole 38 Connecting pin

The present invention relates to an armrest equipment for chairs.

  Various mounting structures for armrest devices have been proposed for chairs. As an example, Patent Document 1 discloses that a duct-like support member that opens to the left and right is fixed to the lower surface of a seat plate, and a base end portion of an armrest device is inserted into this support member. In Patent Document 1, a hook is provided at the base end portion of the armrest device. When the base end portion is fully inserted into the support member, the hook engages with the locking means of the support member, and the armrest device is detached from the support member. Held impossible.

CD-ROM of Japanese Utility Model Publication No. 6-82954

  In patent document 1, since the base end part of an armrest device penetrates into a support member deeply, there exists an advantage which can obtain high support strength. However, since a duct-like support member is separately prepared and fixed to the seat plate, the support member protrudes downward from the lower surface of the seat plate, and thus the support member may be exposed to impair the aesthetics. is there.

  The present invention has been made to improve the current situation.

The present invention is an armrest device attached to a chair. The armrest device includes an elbow strut provided with an armrest fixedly or adjustable in height, and an arm portion extending from the lower end of the elbow strut toward the chair. The arm portion is formed with a left and right side insertion portion that fits into an elbow mounting hole provided in the chair, and a projecting portion that overlaps the chair from the outside below the insertion portion, A screw insertion hole through which a horizontally long screw for fixing the overhanging portion to the chair is inserted in the overhanging portion so as to open in the left-right direction at a position below the insertion portion. .

In the present invention, since it enters the elbow attachment hole of the armrest device , the aesthetics are not impaired (if the armrest device is not attached, the elbow attachment holes may be closed with a cap, and in this case the aesthetics are not impaired). .

  Now, there are two types of armrest devices: a fixed type with a fixed height of the armrest and a movable type that can adjust the height of the armrest. In the case of a mold, an elbow rest is attached to a main body having an elbow strut integrally or separately so that the height can be adjusted. In most cases, the fixed type is made of synthetic resin, and the main body is often made of synthetic resin even if it is a movable type.

  And although the synthetic resin is inferior in strength compared to a metal such as aluminum die-casting, if the present invention is used, the load per unit area can be dispersed by lengthening the insertion portion, so the main body portion including the insertion portion Even if it is made of a synthetic resin, a high support strength can be secured. Therefore, it can be said that the present invention is particularly effective when the entire armrest device or the main body is made of resin.

It is an external view of the chair which concerns on embodiment, (A) is a front view, (B) is a side view. It is a perspective view in the state where an armrest device was separated. It is a separation perspective view of a base. The perspective view of a principal part, (A) is the figure seen from the top, (B) is the figure seen from the downward direction. It is a separate perspective view of the principal part. (A) is the perspective view in the state which attached the armrest apparatus, (B) is the perspective view which looked at the base from back. It is a figure which shows a modification.

Next, an embodiment of the present invention will be described with reference to the drawings. This embodiment is applied to an armrest device attached to a rotary chair that is frequently used for office work. In the following description, the front / rear / left / right wording is used to specify the direction, which is defined as the front direction of the seated person on the basis of the person normally seated in the chair. The front view direction is a direction opposite to the seated person, and the rear view direction is a direction when the seated person is viewed from behind.

(1). Outline of chair As shown in FIGS. 1 and 2, the chair is a leg device displaying only the leg strut (gas cylinder) 1, a base 2 fixed to the upper end of the leg strut 1, and disposed above the base 2. The seat 3 has a backrest 4 arranged behind the seat 4. An armrest device 5 is attached to the base 3. 1 and 2, only one of the armrest devices 5 is displayed, but a pair of left and right armrest devices 5 are attached.

The backrest 5 is adapted to the basic structure of fixing the back plate (inner shell) 7 to the back frame 6, and stretched cushion body 8 on the front surface of the back plate 7. The back frame 6 is connected to the base 2 so as to be able to tilt backward. When the backrest 4 tilts backward, the seat 3 moves upward while moving upward. That is, the seat 3 is attached to the base 2 via the intermediate member, and the seat 3 moves relative to the base 2. Since these locking mechanisms are irrelevant to the present invention, description thereof is omitted.

  The armrest device 5 has an elbow body 9 that is substantially L-shaped in front view and an elbow rest 10 that is adjustable in height. The elbow body 9 has a horizontally long arm portion 11 and an elbow strut 12 extending upward from one end thereof, and an elevating body 13 is mounted on the elbow strut 12 so that the height can be adjusted. A pad 10 is attached. The elbow post 12 and the arm portion 11 may be made of different members.

The base 2 is formed with elbow mounting holes 14 opened on the left and right outer sides thereof. On the other hand, at the distal end of the arm portion 11 of the elbow body 9, a laterally- inserted lateral insertion portion 15 that fits into the elbow mounting hole 14 of the base 2, and a protruding portion 16 that overlaps the outer surface of the base 2 below the insertion portion 15 Are integrally formed, and the overhanging portion 16 is fixed to the base 2 with left and right laterally long screws 17. Details will be described below.

(2) Details of the main part As shown in each figure in FIG. 3 and subsequent figures, the base 2 is composed of a box-shaped base body 19 that opens upward, and one of the interiors of the base body 19 that is disposed at a rearward position. The first metal fitting 20 and a pair of left and right second metal fittings 21 disposed between the front half of the first metal fitting 20 and the base body 19 are provided. These are made of steel plates. The first metal fitting 20 has front and rear foot pieces 22 and is formed in a U-shape opening downward in a side view, and a regulating piece 23 provided on the foot piece 22 is fitted in an engagement hole 24 formed in a bottom plate of the base body 19. Positioning.

The first metal fitting 20 is fixed to the base body 19 by welding. A concentric leg hole 25 is formed in the bottom plate of the base main body 19 and the first metal fitting 20, and a bush 26 is fitted into the leg hole 25, and the bush 26 is welded to the base main body 19 and the first metal fitting 20. doing. The leg support 1 is fitted to the bush 26 from below. Insertion portion 15 of the elbow body 9 is upwardly immovably held in front of the first bracket 20.

The second metal fitting 21 has a side plate 21 a that overlaps the inner side surface of the base 2 and a horizontal portion that extends inward from the upper end thereof. An inward burring portion 27 is formed on the side plate 21a and a female screw is formed on the burring portion 27 (a nut may be welded). The side plate 21 a of the second metal fitting 21 is exposed to the outside from a rectangular window hole 28 formed in the base body 19, and the screw 17 can be screwed into the burring portion 27 through the window hole 28. The side plate 21 a of the second metal fitting 21 is welded to the inner surface of the base body 19.

The insertion portion 15 of the elbow body 9 is supported from below by the second metal fitting 22. In other words, a holding part that sandwiches the insertion part 15 of the elbow body 9 from above and below is formed by the first metal fitting 20 and the second metal fitting 21, and most of the elbow mounting hole 14 is configured by this holding part. ing. The left and right elbow mounting holes 14 communicate with each other in series through the space in the base 2. Further, in the window hole 28 of the base body 19, a portion above the upper surface of the second metal fitting 21 constitutes the elbow mounting hole 14. The inner edge of the window hole 28, the side regulating piece 29 projecting inwardly is formed by bending. Insertion portion 15 of the elbow body 9, by the side regulating piece 29 can be held so as not to shift back and forth.

The opposite side of the side plate 21a of the second metal fitting 21 is formed with a downwardly under piece 31, the lower piece 31 is fitted in the engagement holes 33 formed in the land portion 32 of the base body 19. Thereby, the height of the first metal fitting 20 is accurately defined.

  The second metal fitting 21 is formed with a pair of front and rear upward pieces 21b, and the first metal piece 21 is supported from below by the upward pieces 21b. The distance between the first metal fitting 20 and the second metal fitting 21 is defined by the upward piece 21b, and the insertion portion 15 of the elbow body 9 is held so that it cannot be displaced back and forth. Moreover, while the upward restricting tongue piece 34 projects from the upward piece 21b, the first fitting 20 is formed with an engagement hole 35 into which the upward restricting tongue piece 34 is fitted. And the relative position of the second metal fitting 21 are precisely defined. The first metal fitting 20 and the second metal fitting 21 are integrated by welding.

For example, as shown in FIG. 4 (B), the overhanging portion 16 of the elbow body 9 in the armrest device 5 protrudes greatly downward from the base end of the insertion portion 15 , and a recess opened downward and outward in the overhanging portion 16. 36 is formed so that the head of the screw 17 is hidden in the recess 36. A screw insertion hole 16a through which the screw 17 is inserted is vacated in the overhang portion 16 so as to open in the left-right direction. Further, the insertion portion 15 has a pin hole 37 opened at its distal end surface. As shown in FIG. 3, the base body 19 is covered from below by a cover 40.

  The insertion portions 15 of the left and right armrest devices 5 can be deeply fitted so as to come into contact with each other, and it is preferable that they are so deeply fitted. In this case, it goes without saying that the insertion portion 15 is set at a position so as not to buffer the bush 16.

(3) Summary As described above, the armrest device 5 has the screw inserted from the side into the screw hole 16a of the overhanging portion 16 after the insertion portion 15 of the elbow body 9 is inserted into the elbow mounting hole 14 of the base 2. It is firmly fixed to the base 2 by a simple operation of screwing 17 into the burring portion 27 of the second metal fitting 21. And it is in the state of being sandwiched from above and below the insertion portion 15 in this state, the first fitting 20 and the second fitting 21, by the fact that the overhanging portion 16 overlaps the outer side surface of the base 2, a high supporting Strength is secured.

  As shown by a one-dot chain line in FIG. 6, the insertion portions 15 of the left and right armrest devices 5 can be integrally connected by inserting pins 38 into the pin holes 37. Then, since the left and right insertion portions 15 are reinforced and integrated with each other, the support strength can be further improved. In particular, it is particularly preferable to connect the left and right insertion portions 15 with the pins 37 in a state where they are closely fitted or close to each other so that the sense of unity between both insertion portions 15 is enhanced.

  The insertion portion 15 is firmly fitted in the elbow mounting hole 14 formed by the first metal fitting 20 and the second metal fitting 21, and the load acting on the armrest device 5 mainly acts as a moment with respect to the insertion portion 15. Since it acts to press the overhanging portion 16 against the side surface of the base 2, the armrest device 5 can be firmly fixed even by fastening with only one screw 17.

  When the armrest device 5 is not attached, the elbow attachment hole 14 is closed with a cap (not shown). The insertion portion 15 of the elbow body 9 has a mountain shape when viewed from the side, but it can be formed in a simple quadrilateral shape or a kamaboko shape.

(4). Modification (Fig. 7)
FIG. 7 shows a modification. Among these, (A) is a modification of the second metal fitting 21, the left and right second metal fittings 21 are set so as to be in close contact with each other, and a downward piece 21 d is formed at the tip. Further, at both ends a and a lower end portion front and rear side plates 21a that are provided reinforcing piece 21a abuts against the lower surface of the base 2 together. Therefore, to bend as not to hold the side plates 21a, as a result, the supporting strength of the armrest device 5 is much higher.

FIG. 7B shows an example of a lid device that closes the elbow attachment hole 14 when the armrest device 5 is not attached. That is, in this example, a lid main body 42 having a hole communicating with the window hole 27 is fitted into the window hole 27 of the base 2, and the lid plate 43 is detachably attached to the lid main body 42. The lid main body 42 has locking claws 42 a, 42 b, 42 d for locking to the base 2. The lid body 42 is always attached to the base 2. The base 2 to which the lid main body 42 is attached is different from the embodiment of FIGS. 1 to 6, and the left and right frames are fixed to the lower surface, and the lid main body 42 is greatly swung upward so as not to interfere with the frame. It has been.

(4). Others The present invention can be embodied in various ways other than the above embodiments. For example, the base can be a die-cast product.

The present invention is useful when applied to an armrest device for a chair . Therefore, it can be used industrially.

DESCRIPTION OF SYMBOLS 1 Leg support 2 Base 3 Seat 5 Armrest device 9 Elbow body 14 Elbow attachment hole 15 Insertion part of elbow body 16 Overhang part of elbow body
16a Screw insertion hole 17 Screw 19 Base body 20 First bracket 21 Second bracket 26 Bush 37 Pin hole 38 Connecting pin

Claims (1)

A chair formed by fixing a base to the upper end of a leg post and supporting a seat, a backrest, and an armrest device with the base,
While the base has open elbow mounting holes that are open on both the left and right sides, the armrest device has an insertion portion that fits into the elbow mounting hole of the base and an overhanging portion that contacts the side surface of the base. The overhanging part is fastened with a screw to the base,
Chair.

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