JPH09206158A - Chair with footrest with posture changing function - Google Patents

Abstract

(57) [Abstract] [Problem] With the footrest set in the footrest position,
Prevents foreign objects from being caught between link arms. SOLUTION: The leg rest portion 4 can be changed in posture between a storage posture in which the leg rest portion 4 hangs down from a front edge portion of the seat portion 2 and a foot rest posture which extends forward toward the seating surface of the seat portion 2 in a flush state. And a plurality of link arms for changing the posture of the leg rest portion 4 provided below the seating portion 2 between the storage posture and the footrest posture by the link motion by the drive of the slide mechanism 5 are combined. The link mechanism 6 and the safety cover 64 for covering the link arm exposed between the leg rest 4 and the seat 2 in a state where the leg rest 4 is set in the footrest posture by the link mechanism 6 are provided. There is.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage posture in which a footrest hangs down from a front edge of a seating portion, and a footrest posture which extends forward in a state flush with a seating surface of the seating portion. The present invention relates to a chair having a footrest with a posture changing function configured to change the posture between the chair and the chair.

[0002]

2. Description of the Related Art Heretofore, there has been known a chair having a footrest, which is commonly called an ottoman, at its front edge. The ottoman is provided so as to be capable of changing its posture between a storage posture in which it is suspended from the front edge portion of the chair and a footrest posture in which it extends forward from the front edge portion. Such an ottoman can change its posture between the stored posture and the footrest posture by driving the driving means. Such a posture change is generally performed by a link motion of a link mechanism provided between the ottoman and the drive motor.

When the ottoman is set in the footrest position, the seated person can relax by placing the foot on the ottoman, and in the stowed position, the ottoman is placed in the front edge of the chair. It is very convenient because it can be normally seated because it does not hang down from it and interfere with it, and it can be switched appropriately according to the application.

[0004]

By the way, in a conventional chair with an ottoman, when the ottoman is set in a footrest position, a plurality of link arms forming a link mechanism between the seating portion and the ottoman are externally arranged. The foreign matter is likely to be caught in the link arm in this state. If the ottoman is changed to the stowed posture while foreign matter is caught, the foreign matter caught in the arm arm will be crushed due to the contraction of the link mechanism, and an excessive load will be applied to the drive mechanism, which will be extremely dangerous. It had a problem that it caused the breakdown of the means.

The present invention has been made to solve the above problems, and prevents foreign objects from being caught between link arms when the footrest is set in the footrest position. It is an object of the present invention to provide a chair having a footrest with a posture changing function.

[0006]

According to a first aspect of the present invention, there is provided a chair having a footrest having a posture changing function. The chair has a storage posture that hangs down from a front edge of the seating portion and a seating surface of the seating portion. In a chair having a footrest having a posture changing function capable of changing the posture between a footrest posture that extends toward the front in a flush state, a link mechanism provided below the seating section and a link mechanism An attached pinch prevention plate is provided, and the link mechanism includes a plurality of link arms so that the posture of the footrest can be changed between the storage posture and the footrest posture by a link motion driven by a drive mechanism. Is formed in combination, the pinch prevention plate covers the link arm exposed between the footrest and the seat in the state where the footrest is set to the footrest position by the link mechanism, leg In which it allowed pedestal is characterized in that it is configured to be housed in the lower portion of the seat in a state of being set to the retracted position.

According to the chair having the footrest having the posture changing function, the link mechanism exposed between the footrest and the seating portion when the footrest is set in the footrest position. Since the link arm is covered with the pinch prevention plate, foreign matter is protected by the pinch prevention plate, and the foreign substance is reliably prevented from being pinched by the link arm.

A chair having a footrest having a posture changing function according to a second aspect of the present invention is the chair having a footrest having a posture changing function according to the first aspect, wherein a plurality of link mechanisms are provided. Formed by the quadrilateral link structure of
In the footrest, the length dimension between the fulcrums of the link arms is set so that the quadrilateral link structure is in the extended posture and the retracted posture is in the retracted posture. It is characterized by being present.

According to the chair having the footrest having the posture changing function, since the footrest is attached to the seat through the plurality of quadrangular link structures, the footrest is simply hinged. Compared to the case where it is attached to the front edge of the seating part, the movement trajectory of the footrest can be made into a curve other than a simple arc shape, and the front edge of the seating part can be stored in the stowed position. It becomes possible to store the lower part of the seat so as not to get in the way, and it is possible to make sure that the seat surface of the seating part is surely flush with the seating position in the foot-resting posture.

A chair having a footrest having a posture changing function according to a third aspect of the present invention is a chair having a footrest having a posture changing function according to the first or second aspect.
The pinch prevention plate has a tip end rotatably supported around a front link shaft, and a guide elongated hole extending in the front-rear direction is bored in the central portion of the guide elongated hole. The link shaft of the link arm is fitted in a sliding contact state.

According to the chair having the footrest having the posture changing function, when the posture of the footrest is changed from the storage posture to the footrest posture, the footrest moves forward and upward from the front edge of the seating portion. When displaced, the pinch prevention plate is pulled forward by the forward movement of the front link shaft due to this displacement. Since the link shaft of the link arm in the middle portion is slidably fitted in the guide long hole extending in the front-rear direction of the pinch prevention plate, this pinch prevention plate stabilizes the mounting state and Follow the displacement of the arm.

[0012]

1 is a perspective view showing a frame structure of a chair having a footrest having a posture changing function according to the present invention, showing a state in which the frame of the chair is set in a sitting posture. ing. Further, FIG. 2 shows a state in which the chair 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, the frame structure 1 of a chair has a basic pipe 11 formed by bending a pipe into a U shape,
A seating portion 2, a backrest portion 3, and a 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 frame 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 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 locking means. By operating this locking means, the height position of the armrest support 27 can be manually adjusted, and the height once set can be adjusted. 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 orthogonal to each vertical steel wire 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 thereof, and the zigzag springs 32 are respectively engaged with the pair of upper and lower hooks 31b facing each other in the width direction. 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 whose widthwise dimension is 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 surface 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 of the leg mounting frame 41 is set to be substantially the same as the width of the seat 2, and the height of the connecting frame 42 in FIG. 1 is the same as the height 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 in 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 cross section, 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 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 quadrangular 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, the 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 structure of the displacement mechanism M, in the state shown in FIG. 4 in which the leg rest 4 is housed in the lower front portion of the seat 2 in the housed posture, the drive motor 51 drives the gear box 52 to move the gear. 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 with the leg rest 4 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 a so-called particle board, which is formed by compressing and molding a foamable synthetic resin with a predetermined adhesive into a plate shape, and the high-resilience layer 72 is a foam having a large resilience. The soft layer 73 is made of a foaming synthetic resin having excellent flexibility. The outer skin 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 hard foaming 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.

7 and 8 are explanatory views in side view showing an embodiment of the safety cover 64. FIG. 7 shows the safety cover 64 below the seat 2 behind the ottoman 77 set in the stored posture. FIG. 8 shows the housed state, and FIG. 8 shows the state in which the safety cover 64 is pulled out between the ottoman 77 set in the leg mounting posture and the support column 22 of the seating portion 2. As shown in these drawings, the safety cover 64 is formed by a horizontally long octagonal flat plate, and has a plane dimension capable of covering the link mechanism 6 from the side surface of the chair 10 (the surface side of the paper surface of FIGS. 7 and 8). have.

The safety cover 64 has a tip portion (see FIG. 7).
And the left side of FIG. 8) extends outward from the tenth link shaft 62j (on the front side of the paper surface of FIGS. 7 and 8), and has a retaining head (black circle) at the tip. (Not shown) is rotatably supported around a first support shaft 64b, a central portion thereof extends outward from the fourth link shaft 62d, and a head for retaining is provided at the tip. The link mechanism 6 is supported from the outside by being supported by the second support shaft 64c having a portion (indicated by a black circle).

Further, the safety cover 64 has a guide elongated hole 64a extending in the front-rear direction at the center thereof.
The second support shaft 64c is fitted in the guide elongated hole 64a in a sliding contact state. When the link mechanism 6 is displaced between the state where the link mechanism 6 is in the contracted posture shown in FIG. 7 and the state where the link mechanism 6 is in the extended posture shown in FIG. The path is set so as to shield the link shafts 61a to 61f from the outside. Further, the width dimension of the guide elongated hole 64a is set to be smaller than the diameter of the head portion of the second support shaft 64c to prevent the head portion from coming off from the guide elongated hole 64a.

According to the above structure of the safety cover 64, first, as shown in FIG. 7, the ottoman 77 becomes the seat bottom 7a.
The safety cover 64 is stored in the lower part of the front (left side) of the
Is located between the front and rear struts 22 below the seat 2 and shields the link mechanism 6 in the contracted posture from the outside. When the upper rail 57 is moved forward in this state, the connecting arm 63 connected to the upper rail 57 by the second connecting shaft 63b moves forward, and the connecting arm 63 moves through the first connecting shaft 63a at the rear end to the first connecting shaft 63a. Since the link arm 61a is rotated in the clockwise direction around the first link shaft 62a, the link arms 61a to 61f perform the link motion and the link mechanism 6 extends forward.

Due to the extension of the link mechanism 6, the connecting frame 42 provided at the front end of the connecting frame 42 draws a concave arc upward and projects forward, whereby the tenth frame of the connecting frame 42.
The safety cover 64 pivotally supported by the first support shaft 64b integral with the link shaft 62j is pulled out from the storage position below the seating portion 2. When the safety cover 64 is pulled out, the movement amount of the first support shaft 64b is always larger than the movement amount of the second support shaft 64c.
It moves backward relative to the safety cover 64 that is pulled out while being guided by a.

When the upper rail 57 reaches the front end of the lower rail 56, as shown in FIG. 8, the safety cover 64 is completely pulled out from the storage position under the seat 2 and is in the leg-mounting posture. The first support shaft 64b of the ottoman 77 and the second support shaft 64 that is retracted relative to the safety cover 64.
The extended link arms 61b to 61f are supported by the support shaft 64c and are shielded from the outside.

The ottoman 77 is seat bottom 7
When pulled out from the storage position at the front lower part and set to the footrest position, the extended link mechanism 6 is protected by the safety cover 64. It is possible to reliably prevent the 6 from being caught. Therefore, even if the link mechanism 6 in the extended state is contracted by retracting the upper rail 57, the contraction movement of the link mechanism 6 is hindered by the foreign matter caught between the link arms 61b to 61f, or the foreign matter is blocked. It does not cause any inconvenience such as damage. Further, it is possible to reliably prevent a part of the human body such as legs or arms from being caught in the contracting link mechanism 6, which is a great effect on safety measures.

The present invention is not limited to the above embodiment, but includes the following contents.

(1) In the above-described embodiment, the safety cover 64 is formed of a flat plate so that the safety cover 64 is projected and retracted from the storage position under the seat 2 in opposition to the posture change of the ottoman 77 due to the link movement of the link mechanism 6. It is composed of
Instead of this, the safety cover 64 is formed by an elastic flexible plate such as an accordion,
The flexible plate may be provided between the ottoman 77 and the front support column 22.

(2) In the above embodiment, the link mechanism 6 performs the link movement by the forward / backward movement of the upper rail 57 due to the rotation of the screw shaft 53. The link mechanism 6 may be caused to perform the link motion by the circular movement of the wire or chain stretched between the sprockets.

(3) In the above-described embodiment, only one slider 55 is provided in the lower portion of the seating portion 2 in the substantially central portion in the width direction, and one slider 55 forms a pair of link mechanisms 6 in the width direction. Although they are operated, a pair of sliders in the width direction may be provided for each link mechanism 6 instead.

[0070]

According to the chair having the footrest provided with the posture changing function according to the first aspect of the present invention, in the state where the footrest is set in the footrest posture, the footrest and the seating portion are provided. Since the link arm of the link mechanism exposed to the outside between is in a state of being covered by the pinch prevention plate, foreign matter is protected by this pinch prevention plate, and pinch of foreign matter by the link arm is reliably prevented, In addition to improving safety, overloading of the drive mechanism due to the entrapment of foreign matter is reliably prevented, which is effective in preventing a failure of the drive mechanism due to the overload.

According to the chair having the footrest provided with the posture changing function according to the second aspect of the present invention, since the footrest is attached to the seat through the plurality of quadrilateral link structures, Compared to the case where the footrest is attached to the front edge of the seat simply by the hinge, it is possible to make the movement trajectory of the footrest into a curve other than a simple arc shape, which allows the footrest to move. It is convenient to store the seat in the lower part of the front edge of the seat without disturbing it in the stowed position, and to ensure that it is flush with the seat surface of the seat in the footrest position. Is.

According to the chair having the footrest having the posture changing function of the third aspect of the present invention, the tip of the pinch prevention plate is pivotally supported around the front link shaft. In addition, a guide elongated hole extending in the front-rear direction is bored in the center part, and the link shaft of the link arm in the middle portion is fitted in the guide elongated hole in a slidable state, so that the footrest from the stored posture. When changing the posture to the footrest position, if the footrest is displaced forward and upward from the front edge of the seating part, the pinch prevention plate is pulled forward by the forward movement of the front link shaft due to this displacement, thereby exposing it. The link arm is covered with the pinch prevention plate. Since the link shaft of the link arm in the middle portion is slidably fitted in the guide long hole extending in the front-rear direction of the pinch prevention plate, this pinch prevention plate stabilizes the mounting state and It becomes possible to follow the displacement of the arm.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a frame structure of a chair having a footrest having a posture changing function according to the present invention, showing a state where 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 an explanatory side view showing an embodiment of the safety cover, showing a state in which the safety cover is stored under the seating portion at the rear of the ottoman set in the storage posture.

FIG. 8 is an explanatory side view showing an embodiment of the safety cover, showing a state in which the safety cover is pulled out between the ottoman and the column of the seating portion.

[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 64a guide long hole 64b 1st support shaft 64c 2nd support shaft 7 cushion material 7a seat bottom 7b seat back 71 shape retention layer 72 High Repulsion Layer 73 Soft Layer 74 Skin 75 Covering Material 75a Bag Skin 75b Ridge 75c Fold Groove 76 Armrest 76b Armrest Skin 76a Pad Material 77 Ottoman 77a Pad Material 77b Leg Seat Skin

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroki Hirai 1-8-8 Koshinmachi, Takamatsu City, Kagawa Prefecture Matsushita Judenko Kogyo Co., Ltd.

Claims (3)

[Claims] 1. A posture changing function capable of changing a posture between a retracted posture that hangs down from a front edge of the seating portion and a footrest posture that extends forward toward the seating surface of the seating portion in a flush state. In a chair having a footrest, a link mechanism provided below the seating portion and a pinch prevention plate attached to the link mechanism are provided, and the link mechanism has a storage posture of the footrest and a foot. It is formed by combining a plurality of link arms so that the posture change between the mounting posture and the mounting posture is performed by the link motion by the drive of the drive mechanism. It is configured to cover the link arm exposed between the foot rest and the seat in the state set to, and to be stored under the seat in the state where the foot rest is set in the storage posture. thing A chair having a footrest with a posture changing function. 2. The link mechanism is formed by a plurality of quadrilateral link structures, and the footrest is in a footrest position when the quadrilateral link structure is extended and in a contracted state. The chair having a footrest having a posture changing function according to claim 1, wherein the length dimension between the fulcrums of each link arm is set so as to be in a storage posture. 3. The pinch prevention plate has a tip end portion rotatably supported around a front link shaft, and a guide elongated hole extending in the front-rear direction formed in the center portion.
A chair having a footrest having a posture changing function according to claim 1 or 2, wherein a link shaft of a link arm at an intermediate portion is fitted in the guide elongated hole in a sliding contact state.