JPH09206168A - Armrest structure for chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a chair and a foreign matter from being damaged even when a seat back is posture-changed to a sitting posture while the foreign matter is fitted in a clearance between the seat back and an armrest. SOLUTION: For this armrest structure, the chair 10 is formed from the seat back 7b, a seat bottom 7b and the armrest 76 attached to the seat bottom 7b, the seat back 7b is connected to the seat bottom 7a turnably around a connection shaft 17 by the drive of a driving means between the sitting posture and a reclining posture and a planar frame 27a is covered with a pad material 76a provided with flexibility for the armrest 76. Then, the planar frame 27a is installed so as to form the clearance of a prescribed interval with the seat back 7b while the seat back 7b is set in the sitting posture and the pad material 76a is extended from the planar frame 27a of the armrest 76 to a back part so as to fill the clearance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an armrest structure of a so-called reclining chair, which is configured to be capable of changing its posture between a sitting posture in which a backrest is raised and a reclining posture in which it is tilted rearward.

[0002]

2. Description of the Related Art Conventionally, a so-called reclining chair is provided in the rear portion of a seat bottom, which is a sitting portion, in which a backrest portion is provided so that the posture can be changed between a substantially vertical sitting posture and a reclining posture which is tilted backward. Are known. Such a chair is very convenient because it can be adapted to the usage pattern of the chair such that the seat back is set to the sitting posture when sitting normally and the seat back is set to the reclining posture when resting.

The seat back is generally configured to change its posture by driving a drive motor, and the posture of the seat back can be arbitrarily changed between a sitting posture and a reclining posture by driving the drive motor by operating a switch. It can be done.

Such a reclining chair is usually
It has a pair of left and right armrests as armrests which are erected from both sides of the seat bottom, and when sitting, the elbows are placed on these armrests so that the user can sit comfortably.

[0005]

By the way, an armrest is usually formed by including a frame extending in the front-rear direction so that a rear end of the armrest is close to a seat back in a seated posture, and a pad material covering the frame. The dimensions are set so that the rear end portion of the armrest and the front surface of the side portion of the seatback are in contact with each other in the seated posture.

Therefore, when the armrest is set in the reclining posture, a gap is formed between the seatback and the rear end of the armrest. Therefore, when the foreign matter exists in this gap, the drive motor is driven. When the seat back is returned to the seated posture, the foreign matter is pressed and sandwiched between the seat back frame and the armrest frame, which may overload the drive motor or damage the foreign matter. Had.

The present invention has been made in order to solve the above-mentioned problems, and the seat back is changed from the reclining position to the sitting position with a foreign substance being caught between the seat back and the armrest. It is an object of the present invention to provide an armrest structure for a chair that will not be damaged by foreign matter even if it is changed.

[0008]

In the armrest structure for a chair according to claim 1 of the present invention, a chair is formed from a backrest portion, a seating portion, and an armrest attached to the seating portion, and the backrest is provided. The portion is rotatably connected to the seat portion between a sitting posture and a reclining posture by driving a driving means, and the armrest is a chair armrest structure in which a frame is covered with a pad material having flexibility, The frame of the armrest is installed so that a gap of a predetermined interval is formed between the frame of the armrest and the backrest in a state where the backrest is set in the sitting posture, and the pad material is configured to fill the gap. The armrest extends from the frame toward the rear.

According to the armrest structure of this chair, since the rear end of the armrest and the front surface of the backrest are in contact with each other when the backrest is set in the sitting posture, the seated person is The elbows can be placed on the armrests over a wide area, and the appearance of the chair will be excellent in terms of design.

On the contrary, when the backrest is set in the reclining posture, the rear end of the armrest and the front face of the backrest are separated from each other, and a gap is formed between them. Then, when the backrest portion is changed to the sitting posture by the driving of the driving means with the foreign matter being caught in the gap,
The foreign matter is pushed toward the armrest by the backrest portion, but since the pad material is extended rearward at the rear end portion of the frame of the armrest, the pushed foreign matter is moved by the drive means. Move forward with the pad material crushed. Therefore, when the backrest is in the sitting posture, foreign matter is interposed between the armrest frame and the backrest through the crushed pad material, so that the foreign matter and the chair are surely damaged. To be prevented.

The chair armrest structure according to a second aspect of the present invention is the chair armrest structure according to the first aspect, wherein the extended pad member is elastically deformable. Is.

According to the armrest structure of this chair, when the backrest portion is changed to the sitting posture in the state where the foreign matter is caught in the gap between the rear end portion of the armrest and the front surface portion of the backrest portion, both of them are seated. The pad material is elastically deformed by the sandwiched foreign matter, which reliably prevents the foreign matter and the chair from being damaged.

[0013]

1 is a perspective view showing a frame structure of a chair to which an armrest structure according to the present invention is applied, showing a state where the chair is set in a sitting posture.
Further, FIG. 2 shows a state in which the chair frame of FIG. 1 is set in a reclining posture. A chair formed by mounting a seat bottom, a seat back and an ottoman on a frame is shown in FIG. As shown in these drawings, a chair frame structure 1 includes a seat portion 2 and a seat portion 2 on a base pipe 11 formed by bending a pipe into a U-shape.
The backrest portion 3 and the leg rest portion 4 are arranged and formed.

The base pipe 11 has a pair of side pipes 11a extending parallel to each other in the front-rear direction. The base pipes 11 extend outward in the width direction (XX direction in FIG. 1) at the upper front portion of the side pipes 11a. A pair of rectangular lower supporting plates 12 that protrude in the front-rear direction and extend in the front-rear direction (Y-Y direction in FIG. 1) are provided, and the seating portion 2 is formed on the pair of lower supporting plates 12. There is.

Further, in the foundation pipe 11, the front beam member 13 and the central beam member 1 are arranged between the side pipes 11a from the front.
4 and the rear beam member 15 are sequentially bridged and fixed so that various members can be supported on the foundation pipe 11 and the structural strength of the frame structure 1 of the chair is improved. There is.

The seating portion 2 is hung between a pair of widthwise support pedestals 21 provided on each lower support plate 12, an armrest portion 24 provided on the top of each support pedestal 21, and a pair of support pedestals 21. The buffer support member 28 is provided. The support pedestal 21 is composed of four columns 22 standing upright at the four corners of the lower support plate 12 and an upper support plate 23 supported by these columns 22 and extending in the horizontal direction. Two of the columns 22 outside in the width direction are dimensioned to be higher than the upper support plate 23, and the crosspiece 22a is inserted between the tops thereof, and between the pair of columns 22 at the front corner. The front rod 22b is cross-linked.

The width of each of the upper support plates 23 is set to be slightly larger than that of the lower support plate 12, so that edges of the upper support plates 23, which face each other, project inward from the support base 21.
An overhang portion 23a that supports the cushioning support member 28 is formed in this protruding portion. A plurality of locking holes 23b are formed in the overhang portion 23a at substantially equal pitches so as to be arranged in series in the front-rear direction.
The buffer support member 28 is locked to b.

The armrest portion 24 is the upper support plate 2
It is provided with two square cylinders 25 erected on the top of the three, armrest mounting cylinders 26 fitted into these square cylinders 25, and armrest supports 27 mounted on the armrest mounting cylinders 26. The rectangular tubes 25 have the same height and are dimensioned such that the tops thereof are located above the crosspiece 22a, and are fixed to the crosspiece 22a by welding or the like.

The armrest support 27 has a plate-shaped frame 27a extending horizontally in the front-rear direction, and a pair of support rods 27b hanging from the bottom surface of the plate-shaped frame 27a.
Are formed. The pair of support rods 27
In b, the distance between the center lines is set to be equal to the distance between the center lines of the armrest mounting cylinders 26, whereby the front and rear support rods 27b can be fitted into the corresponding armrest mounting cylinders 26. The armrest mounting cylinder 26 has a rear one as a seat back 7b described later.
(FIG. 9) is provided in a state in which the backrest posture is set, and is spaced apart from the front surface portion of the seat back 7b by a predetermined distance to the front side, whereby the support rod 27b and the seat back 7b are provided.
A gap 260 is formed between and.

The armrest mounting cylinder 26 is a rectangular cylinder 25.
It has an outer peripheral shape that can be fitted in the sliding contact state, and has a mounting hole 26a that is concentric with the center line and extends vertically. The mounting hole 26a is set to have an inner diameter that allows the support rod 27b of the armrest support body 27 to be fitted in a sliding contact state, so that the height position of the armrest support body 27 is mounted in the armrest mount cylinder 26. Despite this, the foot-resting posture of the plate-shaped frame 27a is maintained.

Further, the armrest mounting cylinder 26 has a lock means, and by operating this lock means, the height position of the armrest support 27 can be manually adjusted, and the height once set. The position can be maintained.

FIG. 3 is a plan view showing an embodiment of the buffer support member. As shown in this figure, the buffer support member 28
Is a grid member 28a formed by arranging steel wires vertically and horizontally in a grid pattern, and the grid members 28a on the left and right upper support plates 23.
It is provided with a plurality of coil springs 28d supported between them.

In the present embodiment, the grid member 28a has three vertical steel wires 28b arranged at equal intervals so as to extend in the front-rear direction, and then has a large number of horizontal steel wires 28b so as to be orthogonal to the respective vertical steel wires 28b. It is formed by arranging the steel wires 28c and welding the intersections of the vertical steel wires 28b and the horizontal steel wires 28c.

The coil spring 28d has hook portions 28e whose both ends are bent. Then, one hook portion 28e of the coil spring 28d is locked in the locking hole 23b of the overhang portion 23a, and the other hook portion 28e is locked in the vertical steel wires 28b on both sides of the lattice member 28a. The buffer support member 28 is mounted between the left and right upper support plates 23 while being pulled in opposite directions by the urging forces of the left and right coil springs 28d.

As shown in FIGS. 1 and 2, the backrest portion 3 has an inverted U-shaped back frame 31 and a pair of upper and lower zigzag springs 32 stretched between side frames 31a of the back frame 31. A back plate 33 supported by the pair of zigzag springs 32, and a pair of knuckle members 34 provided on the lower inner side surface of the side frame 31a so as to face each other. The back frame 31 has a reinforcing frame 31c that is bridged to the side frames 31a at the lower part thereof.

The pair of side frames 31a are provided with two upper and lower hooks 31b at the center of the front surface, and a pair of upper and lower hooks 31b facing each other in the width direction are engaged with zigzag springs 32, respectively. ing. The back plate 33 has a pair of left and right fork-shaped holding pieces 33a protrudingly provided on the back surface of the back plate 33. By holding the zigzag springs 32 between the holding pieces 33a, the back plate 33 moves back and forth through the zigzag springs 32. Frame 31
It can be attached to. The lower portion of the back plate 33 is bulged forward so as to follow the curves of the hipbone and spine of the seated person. Then, the lower end edge of the back plate 33 is dimensioned so as to face the surface of the reinforcing frame 31c or be positioned below the surface.

On the other hand, the side pipe 1 of the base pipe 11
Central beam member 14 and rear beam member 15 bridged between 1a
A pair of widthwise brackets 16 supported by them
Is erected. The dimension between the facing surfaces of the pair of brackets 16 is set to be slightly larger than the dimension between the outer surfaces of the pair of knuckle members 34, so that the pair of knuckle members 34 can be sandwiched between the brackets 16. Has become.

Then, with the pair of knuckle members 34 being sandwiched between the left and right brackets 16, the connecting shaft 17 extending in the width direction is attached to each bracket 16 and the knuckle member 34.
The connecting shaft 17 and the knuckle member 34.
And the backrest portion 3 are connected to the seating portion 2 in such a manner that they can rotate around the connecting shaft 17.

A drive mechanism 18 for rotating the backrest 3 around the connecting shaft 17 is provided on the outer side of one of the brackets 16. The drive mechanism 18 is internally provided with a drive motor (not shown) and a drive force transmission means that is a combination of various gears. When the drive motor is driven, the connecting shaft 17 is rotated about its axis through the drive force transmission means. It can be rotated. Then, by driving the drive mechanism 18 by a switch operation, the back frame 31 rotates around the connecting shaft 17, and when the back frame 31 reaches a desired tilted posture, the switch is turned off.
As shown in, the tilted posture of the back frame 31 at that time is maintained.

The rear beam member 15 has an inverted U-shaped stopper 15a having a widthwise dimension substantially the same as that of the rear beam member 15.
And the side frame 31a in the reclining posture in which the angle of the back frame 31 with respect to the vertical plane is maximized.
Stops on the top of the stopper 15a, and the back frame 3
Further displacement of 1 is prevented.

The leg rest 4 is displaceable between the retracted posture shown in FIG. 1 hanging on the front face of the seat 2 and the foot rest posture shown in FIG. Such a leg rest 4
Is provided with a pair of upper and lower leg mounting frames 41 extending in the width direction of the seating portion 2, and a pair of width direction coupling frames 42 coupling the pair of leg mounting frames 41.

The width dimension of the leg mounting frame 41 is set to be substantially the same as the widthwise dimension of the seat portion 2, and the height dimension of the coupling frame 42 in FIG. 1 is the height dimension of the upper support plate 23. It is set to a little less than half. The leg rest 4 including the leg rest frame 41 and the coupling frame 42 is located in the lower part of the front surface of the seat 2 in the storage posture (FIG. 1) and at the top of the seat 2 in the foot rest posture (FIG. 2). It is adapted to be pushed up to a position substantially the same as the support plate 23.

The leg rest 4 is constructed so that it can be displaced by the displacement mechanism M between the storage posture and the footrest posture. The displacement mechanism M is formed by combining the slide mechanism 5 and the link mechanism 6. When the slide mechanism 5 is driven, the link mechanism 6 carries out a predetermined operation, whereby the leg rest 4 is displaced.

FIGS. 4 and 5 are perspective views showing an embodiment of the displacement mechanism M. FIG. 4 shows a state in which the leg rest 4 is stored in the storage position in the storage posture, and FIG. Shows the state in which each is in a footrest position. As shown in these drawings, the slide mechanism 5 includes a drive motor 51 and a gear box 52 that transmits the drive force of the drive motor 51.
A screw shaft 53 extending from the gear box 52, a nut member 54 screwed to the screw shaft 53, and a slider 5 connected to the nut member 54.
5 are formed.

The drive motor 51 and the gearbox 5
2 is arranged on a pedestal 145 which is bridged by the central beam member 14 and the rear beam member 15. Then, the drive motor 51
Is arranged so that the drive shaft extends in the width direction (XX direction), and is adjacent to the drive motor 51 in the width direction, and a gear box 52 is arranged so as to take in the drive shaft. Various gears such as a worm gear and a pinion are incorporated in the gear box 52, and the driving force of the drive motor 51 is transmitted to the screw shaft 53 via these gears.

The screw shaft 53 is used for the gear box 5
2 is provided so as to project in the front direction (left side in FIGS. 4 and 5) so as to extend in the front-rear direction (Y-Y direction). A nut member 54 is screwed onto the screw shaft 53, and the nut member 54 is moved back and forth by forward and reverse rotation of the screw shaft 53.

The slider 55 is a lower rail 56.
And an upper rail 57 slidably coupled to the lower rail 56. The lower rail 56 is fixed to the front beam member 13 and the rear beam member 15 in a state of extending in the front-rear direction via a spacer 13a having a predetermined height dimension. The lower rail 56 has a C-shape in a sectional view, has a guide opening 56a extending in the front-rear direction in the upper surface portion, and a dovetail groove extending in the front-rear direction is formed in a lower portion of the guide opening 56a.

The upper rail 57 has a rail main body 57a having an Ω shape in a sectional view, and the rail main body 57a.
The bracket 57b protruding from the seat 2 to the left in the width direction and the connecting plate 5 protruding from the seat 2 to the right in the width direction.
7c and is formed.

The rail main body 57a has a pair of left and right wings protruding outward from the lower end edge of the rail body 57a. The wings are fitted in the dovetail groove of the lower rail 56. The top portion projects outward from the guide opening 56a, whereby the upper rail 57 can be moved back and forth while being guided by the lower rail 56. The bracket 57b and the connecting plate 57c are fixed to the top of the rail main body 57a that projects outward from the guide opening 56a. By the way, the upper rail 57 is inside the lower rail 56.
A roller, a rolling ball, and the like (not shown) are internally provided between the upper and the lower rails so that the upper rail 57 can be smoothly moved back and forth.

The connecting plate 57c is integrally connected to the nut member 54 so that the upper rail 57 moves back and forth in accordance with the forward and backward movement of the nut member 54. Therefore, by driving the drive motor 51,
The driving force is transmitted through the gearbox 52 to the screw shaft 5
3, the screw shaft 53 is rotated, and the nut member 54 is moved forward and backward by this rotation, whereby the upper rail 57 is moved forward and backward while being guided by the lower rail 56.

The link mechanism 6 is formed by combining a plurality of quadrilateral link structures. In this embodiment, six first to sixth link arms 61a to 61f are adopted as the elements constituting the quadrilateral link structure. On the other hand, a link arm support plate 22c is bridged between the pair of front and rear columns 22 in the width direction on the inner side (right side in FIGS. 4 and 5). The upper ends of the first link arm 61a and the third link arm 61c are rotatably connected to the link arm support plate 22c around the rear first link shaft 62a and the front third link shaft 62c.

The rear end of the second link arm 61b is rotatably connected to the intermediate portion of the first link arm 61a about the second link shaft 62b, and the intermediate portion of the second link arm 61b is also provided. Is rotatably connected to an intermediate portion of the third link arm 61c around the fourth link shaft 62d.

The lower end of the third link arm 61c is the fourth
The lower end of the link arm 61d is rotatably connected to the fifth link shaft 62e. In addition, the second link arm 61
The front end of b is rotatably connected to the upper end of the fifth link arm 61e about the sixth link shaft 62f, and the middle part of the fourth link arm 61d is the fifth link arm 61e.
Is rotatably connected to the middle part of the shaft around the seventh link shaft 62g. Furthermore, the lower end of the fifth link arm 61e is rotatably connected to the lower end of the sixth link arm 61f about the eighth link shaft 62h.

The upper end of the fourth link arm 61d is rotatably connected to the upper part of the connecting frame 42 of the leg rest 4 about the ninth link shaft 62i and the sixth link arm 61f. The upper end portion is also rotatably coupled to the lower portion of the coupling frame 42 about the tenth link shaft 62j.

Therefore, in the present link mechanism 6, the first link shaft 62a, the second link shaft 62b, the third link shaft 62c, and the fourth link shaft 62d are used as fulcrums by the link arms and the coupling frame 42. 1, a quadrilateral link structure, a fourth link shaft 62d, a seventh link shaft 62g,
A second quadrilateral link structure with the sixth link shaft 62f and the seventh link shaft 62g as fulcrums, and the seventh link shaft 62
g, the eighth link shaft 62h, the ninth link shaft 62i, and the tenth link shaft 62j, and three quadrilateral link structures are formed with the third quadrilateral link structure.

Moreover, the first and second quadrilateral link structures share the second link arm 61b, and the second and third quadrilateral link structures share the fourth link arm 61d. With such a link structure, the posture of the leg rest 4 can be changed between the storage posture and the footrest posture.

Regarding the length and shape of each link arm 61a to 61f and the installation position of each link shaft 62a to 62j, the first link arm 61a rotates counterclockwise around the first link shaft 62a, As a result, the leg rest 4 is in the retracted position with the second link shaft 62b retracted rearward of the first link shaft 62a, and conversely, the first link arm 61a moves clockwise around the first link shaft 62a. It is set so that the leg rest 4 is placed in a foot-resting position in a state in which the leg rest 4 is pivoted and thereby moved forward so that the second link shaft 62b is positioned in front of the first link shaft 62a.

On the other hand, a portion of the first link arm 61a below the second link shaft 62b is slightly bent rearward,
The connecting arm 63 is coupled to the tip portion thereof. The connecting arm 63 is for connecting the link mechanism 6 and the slide mechanism 5, and its rear end is rotatably connected to the tip end portion of the first link arm 61a about the first connecting shaft 63a. In addition, the front end of the connecting arm 63 has the lower rail 56.
Is rotatably coupled to the bracket 57b around the second coupling shaft 63b.

Further, the outside of each of the link arms 61a to 61f moves following the operation of the link mechanism 6, and the leg rest 4 is moved.
Each link arm 61a extended in a state in which
A plate-like safety cover 64 is provided to cover ~ 61f from the outside. By providing the safety cover 64, it is possible to prevent foreign matter from entering from the side of the chair 10 toward the link arms 61a to 61f in the state where the leg rest 4 is in the foot resting posture. There is.

According to the above-described structure of the displacement mechanism M, in the state shown in FIG. 4 in which the leg rest 4 is stored in the lower front portion of the seat 2 in the storage posture, the drive motor 51 drives the gear box 52 through the gear box 52. By rotating the screw shaft 53 in a predetermined direction, the nut member 54 advances.

As the nut member 54 advances, the lower rail 56 advances through the connecting plate 57c, and the lower rail 5 moves.
Since the connecting arm 63 connected to the bracket 57b of No. 6 by the second connecting shaft 63b also moves forward, the first link arm 61a connected to the rear end of the connecting arm 63 by the first connecting shaft 63a is the first link. By rotating clockwise about the shaft 62a, each link arm 61b to 61f performs a predetermined link motion by this rotation, whereby the joint frame 42 is extended as a whole toward the upper side, and the nut member 54 is predetermined. As shown in FIG. 5, the leg rest 4 in the state of reaching the front position of FIG.

On the contrary, as shown in FIG. 5, the lower rail 56 is retracted by reversely driving the drive motor 51 while the leg rest 4 is in the foot rest position, whereby the first link arm 61a moves to the first link. It rotates counterclockwise around the shaft 62a, and the link movement of each link arm 61b to 61f reverse to the above causes the leg rest 4 to return to the original storage posture shown in FIG.

FIG. 6 shows a frame structure 1 of the chair shown in FIG.
The cushion material is attached to the seat bottom 7
It is a partially notched perspective view which shows the state in which the chair 10 provided with a and the seat back 7b was formed. As shown in this figure, a predetermined cushion member 7 is provided on each of the cushion support member 28 stretched between the pair of left and right upper support plates 23 and on the back plate 33 supported by the zigzag spring 32 of the back frame 31. The seat bottom 7a, which is a seat, and the seat back 7b, which is a backrest, are formed.

Such a cushion material 7 has a shape-retaining layer 71 made of a plate-like member at the bottom, a high-resilience layer 72 made of a high-resilience material in the middle portion, and a soft layer 7 made of a flexible material in the upper portion.
3 and a four-layer structure in which a skin 74 is laminated on the surface. In the present embodiment, the shape-retaining layer 71 is formed by what is called a particle board, which is formed by compressing and molding a foamable synthetic resin chip with a predetermined adhesive into a plate shape, and the high-resilience layer 72 has high resilience. The soft layer 73 is formed of a foamable synthetic resin, and the soft layer 73 is formed of a foamable synthetic resin having excellent flexibility. Also, the epidermis 74
Is formed of a flexible synthetic resin sheet.

The shape-retaining layer 71, the high-resilience layer 72, and the soft layer 73 are laminated via an adhesive, and the surface of the soft layer 73 is covered with a skin 74 to form the cushion material 7. There is. In this embodiment, the seat bottom 7a is obtained by cutting the laminate of the shape-retaining layer 71, the high-resilience layer 72, and the soft layer 73 into a predetermined size.
And the seat back 7b are made, and the surfaces of the cushion backing member 28 and the back plate 33 are placed on the cushion support member 28 and the back plate 33, and the surface is covered with the skin 74. The cushion member 7 is configured to wrap a predetermined member (for example, the front rod 22b and a part of the cushioning support member 28 in the case of the seat bottom 7a, the top of the back frame 31 and the reinforcing frame 31c in the case of the seat back 7b). The seat bottom 7a and the seat back 7b are formed by sewing or welding the edges of the outer skin 74 to each other on the back surface of the.

The plate-shaped frame 2 of the armrest portion 24
7a is a pad material 76a made of soft foamable synthetic resin
It is buried inside. The armrest 76 is formed by covering the surface of the pad material 76a with a skin (armrest skin 76b). Pad material 76
The embedding of the plate-shaped frame 27a into the inside of a and the covering of the pad material 76a with the armrest skin 76b can be performed by an integral foam molding method.

On the other hand, a skin 74 for the seat bottom 7a.
Includes cover members 75 for armrests on both sides in the width direction.
Are attached by sewing or welding. The covering member 75 is formed by filling the inside of a bag-shaped skin (bag skin 75a) with a flexible material such as sponge. Then, while the bag skin 75a is filled with the flexible material, the front and back surfaces of the bag skin 75a are joined by sewing or the like over the entire length in the front-rear direction, whereby a plurality of ridges 75b are formed on the surface of the covering member 75. And the folding groove 75c extending in the front-rear direction is formed between the adjacent protrusions 75b.

By adopting such a configuration, the cover member 75 can be easily bent in the width direction at the folding groove 75c portion, and can be bent at any folding groove 75c portion corresponding to the height position of the armrest 76. The surface of the armrest portion 24 can be easily and surely covered.

The leg mounting frame 41 of the leg mounting portion 4 is
It is embedded in a pad material 77a made of hard foamable synthetic resin. The surface of the pad material 77a is covered with an outer skin (leg mounting skin 77b) to form a so-called ottoman 77 that supports the legs of the seated person. Coupling frame 42 for the pad material 77a
Can be embedded and the leg mounting skin 77b can be covered by an integral foam molding method.

FIG. 7 is a partially cutaway perspective view showing details of an embodiment of the armrest 76. As shown in this figure, the armrest 76 includes a pair of front and rear support rods 2.
It is formed of a plate-shaped frame 27a fixed to the top of 7b, a pad material 76a in which the plate-shaped frame 27a is embedded, and an armrest skin 76b covering the pad material 76a.

The plate-like frame 27a is mounted on the frame (square tube 25) of the seat 2 so that a gap L is formed between its rear end and the seat back 7b in the seated posture. I have to. In this embodiment, the interval L is
Is set to a value approximately equal to the diameter of the human head.

A soft urethane foam is applied to the pad material 76a, so that the pad material 76a is in a very soft state. This pad material 76a
Is extended rearward from the rear end portion of the plate-shaped frame 27a by the distance L, and the plate-shaped frame 27 is attached to the extended portion.
An extended portion 76c where a does not exist is formed. The plate-shaped frame 27a allows the rear end of the armrest 76 to come into contact with the surface of the seatback 7b when the seatback 7b is set in the seated posture.

FIG. 8 is a side sectional view for explaining the operation of the armrest structure according to the present invention.
(A) The seat back 7 in which the foreign object Z is in a reclining posture
The state of being sandwiched between the surface of b and the rear end of the armrest 76, (b) shows the seat back 7b with the foreign matter Z being sandwiched.
Shows the state in which the posture is changed to the sitting posture.

First, as shown in FIG. 8A, a foreign object Z having a diameter substantially equal to that of the head of the human body is sandwiched between the seatback 7b in the reclining posture and the rear end of the armrest 76. The drive mechanism 18 (FIG. 2) is driven,
As a result, when the seat back 7b rotates counterclockwise around the connecting shaft 17, the foreign matter Z is pressed forward by the seat back 7b and is pressed against the edge of the armrest 76.

However, the armrest 76 has a pad material 76 without the plate-like frame 27a at the rear portion thereof.
Since the extended portion 76c of a is provided, the extended portion 76c formed of urethane foam, which is a flexible material, by pressing with the foreign matter Z is elastically deformed flexibly as shown in (b) of FIG. As a result, the drive mechanism 18 is not overloaded and the foreign matter Z is not damaged.

On the contrary, in the state where the foreign matter Z shown in FIG. 8B is pressed and sandwiched between the seat back 7b and the rear end portion of the armrest 76, the seat back 7b is driven by the reverse drive of the drive mechanism 18. When the armrest 76 is rotated clockwise around the connecting shaft 17, the armrest 76 returns to the original rearward protruding state by the restoring force of the elastically deformed pad material 76a.

FIG. 9 is a side sectional view for explaining another operation of the armrest structure according to the present invention.
As shown in this figure, with the seat back 7b set in a backrest posture, a gap 2 having a predetermined size is provided between the seat back 7b and the support rod 27b of the armrest support 27.
Since 60 is formed, even if the seat back 7b in the reclining posture is changed to the backrest posture with the foreign matter Z placed behind the support rod 27b of the seat bottom 7a, the foreign matter Z is supported. The rod 27b and the seat back 7b are not pressed and pinched, and the foreign matter Z can be reliably prevented from being damaged.

In the above embodiment, the pad material 76 is used.
Although a is made of soft urethane foam, other foam materials such as ethylene foam, propylene foam and styrene foam may be used instead of urethane foam.

[0069]

According to the armrest structure for a chair of claim 1 of the present invention, the frame of the armrest has a predetermined gap between the frame of the armrest and the backrest in the seated posture. The pad material, which is installed so as to be formed, covers the frame and extends rearward from the frame of the armrest so as to fill the above-mentioned gap, so that the backrest portion set in the reclining posture is used. Even if foreign matter is pressed between the armrest and the armrest, the backrest part is changed to the sitting posture by the drive of the drive means, and the foreign matter is pressed by the backrest part toward the armrest. When moving forward with the crushable pad material squeezed and the backrest in a seated position, foreign matter is armless through the crushed pad material. Becomes interposed state between the frame and the backrest portion, breakage of the foreign matter or the chair can be reliably prevented, it is effective for the extremely secure the chair.

According to the armrest structure for a chair of claim 2 of the present invention, since the extended pad material is configured to be elastically deformable, the rear end portion of the armrest and the front surface portion of the backrest portion are formed. When the backrest portion is changed to the sitting posture with the foreign matter caught in the gap, the foreign matter sandwiched between the two elastically deforms the pad material, thereby reliably preventing the foreign matter and the chair from being damaged.

[Brief description of drawings]

FIG. 1 is a perspective view showing a frame structure of a chair to which an armrest structure according to the present invention is applied, showing a state in which the frame structure is set in a sitting posture.

FIG. 2 is a perspective view showing a state where the frame structure of the chair shown in FIG. 1 is set in a reclining posture.

FIG. 3 is a plan view showing an embodiment of a buffer support member.

FIG. 4 is a perspective view showing an embodiment of a displacement mechanism, showing a state in which the leg rest is stored in a storage position in a storage position.

FIG. 5 is a perspective view showing an embodiment of a displacement mechanism, showing a state where the leg rests are in a foot resting posture.

FIG. 6 is a partially cutaway perspective view showing a state in which a cushion member is attached to the frame structure of the chair shown in FIG. 1, and thereby a chair having a seat bottom and a seat back is formed.

FIG. 7 is a partially cutaway perspective view showing details of an embodiment of the armrest.

FIG. 8 is an explanatory view of a side cross-sectional view for explaining the operation of the armrest structure according to the present invention, in which (a) foreign matter is sandwiched between the surface of the seatback in the reclining posture and the rear end portion of the armrest. The state in which the seat back is changed to the sitting state while the foreign matter is sandwiched is shown in (b).

FIG. 9 is a side sectional view for explaining another operation of the armrest structure according to the present invention.

[Explanation of symbols]

 1 Chair Frame Structure 11 Foundation Pipe 11a Side Pipe 12 Lower Support Plate 13 Front Beam Member 13a Spacer 14 Center Beam Member 15 Rear Beam Member 15a Stopper 16 Bracket 17 Connecting Shaft 18 Drive Mechanism 2 Seating Part 21 Support Stand 22 Supports 22a Crosspiece 22b Front rod 23 Upper support plate 23a Overhang part 24 Armrest part 26 Armrest mounting cylinder 25 Square cylinder 27 Armrest support 27a Plate frame 27b Support rod 28 Buffer support member 28a Lattice member 28b Vertical steel wire 28c Horizontal steel wire 28d Coil spring 28e Hook part 3 Backrest part 31 Back frame 31a Side part frame 32 Zigzag spring 33 Back plate 33a Clamping piece 34 Knuckle member 4 Leg rest part 41 Leg rest frame 42 Joint frame M Displacement Structure 5 Slide mechanism 51 Drive motor 52 Gear box 53 Screw shaft 54 Nut member 55 Slider 56 Lower rail 56a Guide opening 57 Upper rail 57a Rail main body 57b Bracket 57c Connecting plate 6 Link mechanism 61a to 61f First to sixth link arm 62a to 62j 1st-10th link shaft 63 connecting arm 63a 1st connecting shaft 63b 2nd connecting shaft 64 safety cover 7 cushion material 7a seat bottom 7b seat back 71 shape retention layer 72 high-resilience layer 73 soft layer 74 skin 75 covering member 75a bag Skin 75b Ridge 75c Fold groove 76 Armrest 76b Armrest Skin 76a Pad material 76c Extension part 77 Ottoman 77a Pad material 77b Leg rest skin

Front Page Continuation (72) Inventor Hiroki Hirai 1 8-8 Koshinmachi, Takamatsu City, Kagawa Prefecture Matsushita Judenko Kogyo Co., Ltd.

Claims (2)

[Claims] 1. A chair is formed from a backrest part, a seating part, and an armrest attached to the seating part, and the backrest part is a driving means between the seating position and the reclining position. In the armrest structure of the chair, which is rotatably connected by driving, the frame is covered with a pad material having flexibility,
The frame of the armrest is installed so that a gap of a predetermined interval is formed between the frame of the armrest and the backrest in a state where the backrest is set in the sitting posture, and the pad material is configured to fill the gap. An armrest structure for a chair, wherein the armrest structure extends rearward from a frame of the armrest. 2. The armrest structure for a chair according to claim 1, wherein the extended pad member is elastically deformable.