JP2003070587A - Frame for multi-purpose chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To assure a prescribed length for a cushion of a footrest part, to set the height of the lowest position of a seat surface low when seated, to simplify a structure, and to reduce a cost. SOLUTION: A frame for a multi-purpose chair is equipped with an upper supporting frame 6 provided above a supporting lower frame 2 placed on a floor, a backrest frame 9 and a seat frame 16 mounted on the upper supporting frame 6 rotatably, the footrest frame 22 whose base part is provided rotatably on the front of the seat frame 16, and a step frame 35 provided on the footrest frame 22. The step frame 35 is constituted to rotate from a housed position where the step frame 35 is positioned on the backside of the footrest frame 22 to a supporting position where the footrest frame 22 and the step frame 35 form a flat surface. A link mechanism 40 for a step which rotates the step frame 35 with the rotations of the footrest frame 22 is provided between the seat frame 16 and the step frame 35.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a frame for a multipurpose chair.

[0002]

2. Description of the Related Art In Japanese Patent Laid-Open No. 2000-342376, which is publicly known, an upper supporting frame is provided above a supporting lower frame placed on a floor, and a backrest frame and a seat frame are rotatable on the upper supporting frame. Mounted on the front side of the seat frame, the base of the footrest frame is rotatably provided,
In the footrest frame provided with a step frame, the step frame is substantially L-shaped from the sitting position on the front side of the footrest frame on which the foot of the seated occupant is placed to be substantially the footrest frame. The description is given of a configuration in which the support position can be rotated to a flat support position.

[0003]

In the above-mentioned known example, since the step frame itself has a predetermined thickness, it is positioned on the front side of the footrest frame in the sitting mode. There is a problem that the seat surface height of the seat frame set as the reference is higher than the floor surface by the thickness of the step frame. Further, a configuration in which the length of the footrest frame can be expanded and contracted to change the length of the footrest frame is conceivable, but this method has a problem that a gap is generated in a part of the cushion of the footrest. Therefore, the present invention is such that the minimum seating surface height when seated can be set low without generating a gap in the cushion of the footrest portion.

[0004]

An object of the present invention is to secure a predetermined length of a cushion for a foot rest, enable setting of a minimum seating surface height when seated in a low position, simplify the structure, and reduce the cost.

[0005]

According to the present invention, an upper supporting frame 6 is provided above a supporting lower frame 2 placed on a floor, and a back frame 9 and a seat frame 16 are rotated on the upper supporting frame 6. The foot frame 22 is rotatably mounted, the base of the foot frame 22 is rotatably provided on the front side of the seat frame 16, and the step frame 35 is provided on the foot frame 22. 22 from the storage position located on the back side of the footrest frame 22
A step link mechanism 40 that is configured to be rotatable to a support position that is substantially flush with and that can rotate the step frame 35 by rotating the footrest frame 22 between the seat frame 16 and the step frame 35. This is the frame of the multi-purpose chair provided. According to the present invention, when the footrest frame 22 in the seating mode position rotates upward, the step link mechanism 40 first rotates the step frame 35 downward about the step rotation shaft 37 so that the tip end of the step frame 35 moves. When the footrest frame 22 is extended beyond the lower extension line, the footrest frame 22 is inverted and starts to rotate upward.
Is a frame of a multipurpose chair in which the step frame 35 is substantially flush with the footrest frame 22 when the seat frame 16 is flush with the seat frame 16 in the sitting mode. According to the present invention, in the step link mechanism 40, the intermediate portion of the intermediate arm 42 is rotatably attached to the bracket 41 provided on the footrest frame 22, and the intermediate arm 4 is rotated.
The upper end of a step link rod 44 in the front-rear direction, the lower end of which is attached to the step frame 35 at one end of 2, and the tip of an operation link rod 47 attached to the seat frame 16 side at the other end of the intermediate arm 42 are respectively turned. A frame of a multipurpose chair is movably mounted, and one end of the intermediate arm 42 is separated from the tip of the operating link rod 47 as the foot frame 22 is rotated upward.

[0006]

Embodiments of the present invention will be described with reference to the drawings.
Is a multipurpose chair frame body such as a treatment chair used when an dialysis patient or a dental patient is treated, or a relaxed chair that sits relaxedly, and 2 is a support lower part that constitutes a part of the multipurpose chair frame body 1. The supporting lower frame 2 is a frame and is mounted on the floor by providing front and rear wheels 4 respectively. An upper support frame 6 is provided on the lower support frame 2 via an optional lifter mechanism 5.
The upper support frame 6 has a pair of left and right front and rear rods 7 in the front-rear direction, and the front and rear rods 7 are provided so as to move up and down with respect to the support lower frame 2 via the lifter mechanism 5. A rear bracket 8 is fixed to a rear portion of the front and rear rods 7, and a lower portion of a backrest frame 9 is rotatably attached to an upper portion of the rear bracket 8 by a horizontal shaft 10. A reclining motor 11 is rotatably attached to a central position on the rear surface (rear surface) side of the backrest frame 9, and the reclining motor 11 is provided with a reclining rod 12 that expands and contracts by the rotation of the reclining motor 11. The reclining rod 12 projects downward and is axially attached to the tip of the mounting rod 13 by a shaft 14, and the base of the mounting rod 13 is fixed to the rear bracket 8 or the upper support frame 6 side below the horizontal shaft 10.

Therefore, the rear bracket 8 between the horizontal shaft 10 and the shaft 14, the back frame 9, and the reclining rod 12 of the reclining motor 11 are provided.
And the mounting rod 13 constitute a reclining link. Then, the lower portions of the standing portions 15 standing upward are fixed to the upper surface of the base portion side of each upper support frame 6,
A rear portion of a U-shaped rear frame 17 of the seat frame 16 is rotatably attached to an upper end of each standing portion 15 by a shaft 18.
A seat intermediate connecting frame 19 in the left-right direction is provided on the front side of the seat frame 16, and the seat intermediate connecting frame 19 is placed on the front and rear rods 7 so as to restrict downward rotation of the seat frame 16. . A seat connecting frame 20 in the left-right direction is provided on the front side of the seat intermediate connecting frame 19, the bases of a pair of left and right seat-side arms 21 are fixed to the seat connecting frame 20, and a foot is attached to the tip of each seat-side arm 21. The tip of the footrest-side arm 24 provided on the upper frame 23 of the hanging portion frame 22 is rotatably attached by a left and right footrest rotating shaft 25, and the footrest frame 22 is rotated around the footrest rotating shaft 25. Configure freely.

In this case, each of the seat side arm 21 and the footrest side arm 24 is provided with a stopper surface 26, and the footrest frame 22 is rotated upward so that the footrest frame 22 and the seat frame 16 are mutually moved. In the horizontal state, the stopper surfaces 26 of the seat-side arm 21 and the footrest-side arm 24 are in contact with each other to restrict upward rotation of the footrest frame 22, and the footrest frame 22 relative to the seat frame 16 is configured. Of the seat frame 16 and the footrest frame 22 are integrally rotated upward about the shaft 18. On the contrary, when the seat frame 16 and the footrest frame 22 are integrally rotated downward and the seat connecting frame 20 of the seat frame 16 contacts the upper surface of the front and rear rods 7, the seat frame 16 is rotated downward. Regulate the footrest frame 2
Only 2 is rotated downward. 30 is a tilting motor for vertically rotating the footrest frame 22, 31 is a tilting motor 3
It is a tilt rod that expands and contracts when it is rotated by 0, and the tilt rod 31 is attached to an arm 32 provided on the upper frame 23.

However, the bases of the pair of left and right footrest-side lower arms 34 are fixed to the left and right lower frames 33 of the footrest-side frame 22, and the step frames are attached to the tips of the respective footrest-side lower arms 34. A tip end of a step side arm 36 provided at 35 is rotatably attached by a step rotation shaft 37 in the left-right direction. Then, between the footrest frame 22 and the step frame 35, there is provided a step link mechanism 40 for rotating the step frame 35 forward as the footrest frame 22 rotates upward. In the step link mechanism 40, a bracket 41 is provided on the upper frame 23 of the footrest frame 22, and the intermediate portion of the intermediate arm 42 is rotatably attached to the bracket 41 by a mounting shaft 43.
The upper end (rear end) of the step link rod 44 in the front-rear direction is attached to one end (upper end) of the shaft 2 by the shaft 45, and the lower end (front end) of the step link rod 44 is attached to the step side arm 36 by the shaft 46. The front end (lower end) of the operating link rod 47 is attached to the other end (lower end) thereof by a shaft 48, and the rear end of the operating link rod 47 is attached to the seat side arm 21 by a shaft 49.

In this case, the step link rod 44 is located on the back side of the footrest frame 22, and the intermediate arm 42 moves the step frame 35 around the step rotation shaft 37 to move the footrest frame 22. Footrest frame 2 that is in a horizontal position relative to the storage position on the back side
The length and the arrangement are configured such that the step link rod 44 moves a length (distance) that can be rotated to a support position where the 2 and the seat frame 16 are substantially horizontal. The multipurpose chair frame body 1 is in a sitting mode in which the backrest frame 9 stands up at an arbitrary inclination angle and the footrest frame 22 is lowered frontward, and the backrest frame is in this sitting mode. 9 and the footrest frame 22 can be independently rotated, and the lifter mechanism 5 can vertically move the support lower frame 2 as a whole. Further, when the backrest frame 9 is tilted backward from the sitting mode and the footrest frame 22 is rotated upward until it is flush with the seat frame 16, the bed mode becomes substantially horizontal.

Further, the step frame 35 starts to rotate forward from the seating mode until the footrest frame 22 is flush with the seat frame 16 from the storage position located on the back side of the footrest frame 22. And footrest frame 22
When the bed mode is set to be substantially flush with the seat frame 16, the step frame 35 is also flush with the footrest frame 22 and the seat frame 16, and when further rotated upward, the step frame 35 side is raised and the back is lowered. It also shifts to the exhibition mode in which the frame 9 side is lowered. Then, the armrest frame 50 is provided on one side or both sides of the multipurpose chair frame body 1. On the front side of the armrest frame 50, the upper part of the front rotation arm 51 is rotatably attached by a horizontal shaft 52.
The lower part of the seat frame 16 is rotatably attached to the front part of the seat frame 16 by a horizontal shaft 53, and the upper part of a rear turning arm 54 is rotatably mounted to the rear side of the armrest frame 50 by a horizontal shaft 55. The lower part of the rotating arm 54 is a horizontal shaft 10 in which a back frame 9 is rotatably attached to a rear bracket 8.
The front rotation arm 51, the rear rotation arm 54, and the armrest frame 50 constitute an armrest link 56 such as a substantially parallel link, and the armrest link 56 causes the armrest frame 50 to move. A substantially horizontal state is maintained regardless of the tilt angle caused by the forward and backward rotation of the. It should be noted that when the backrest frame 9 is rotated rearward from a predetermined angle, the armrest frame 50 is inclined rearward and downward.

In this case, the armrest frame 50
Is independent of the rotation of the backrest frame 9 and the armrest mode in which the backrest frame 9 is moved substantially back and forth regardless of the inclination angle of the backrest frame 9 and moves back and forth according to the position of the backrest frame 9. Switch to the rail mode, which is located on the side. An arc-shaped locking guide member 58 centered on the horizontal shaft 55 is provided on the horizontal shaft 55 that serves as an upper shaft attachment portion of the rear rotation arm 54, and a lock hole 59 is formed in the locking guide member 58. An engaging member 60, which is provided and engages and disengages with the lock hole 59, is movably provided on the rear rotation arm 54. The engaging member 60 is formed of a shaft member, and the engaging member 60 is inserted into a pair of upper and lower mounting plates 61,
Is a rear turning arm 54 formed by a pair of left and right plate members.
To pinch. Engaging member 60 between the upper and lower mounting plates 61
The operating member 62 is attached to the operating member 6 by an arbitrary method.
A spring 63 for urging the engaging member 60 toward the lock hole 59 so as to engage the engaging member 60 is provided between the mounting plate 61 and the mounting plate 61. When the engagement member 60 engages with the lock hole 59, the engagement member 60 enters the rail mode and holds the rear-side turning arm 54 at a predetermined angle. Therefore, the locking guide member 58, the lock hole 59, the engagement member 60, and the mounting plate 61. The operation member 62 and the spring 63 constitute an upper lock mechanism 65.

A lower mode switching mechanism 68 for switching the rotation of the armrest link 56 between the armrest mode in which the backrest frame 9 is rotated and the rail mode in which the armrest link 56 is not rotated is provided below the rear rotation arm 54. The lower mode switching mechanism 68 has a lower mode by an engaging groove 66 with which the upper horizontal shaft 10 engages, and a circular guide hole 67 provided in a lower portion of the engaging groove 66 for rotating the horizontal shaft 10. The switching hole 69 of the switching mechanism 68 is configured, and the different diameter portion 70 of the horizontal shaft 10 that rotates together with the back frame 9 is inserted into the switching hole 69. The different-diameter portion 70 of the horizontal shaft 10 is formed in a different-diameter shape that fits in the engagement groove 66 and is rotatable in the switching hole 69. Therefore, the lower mode switching mechanism 68 connects the horizontal shaft 10 to the engaging groove 6
6, the different diameter portion 70 of the horizontal shaft 10 and the engagement groove 66 are engaged.
And are in the engaged state to enter the armrest mode, and the rotation of the horizontal shaft 10 accompanying the rotation of the backrest frame 9 causes the rear rotation arm 54 to rotate in accordance with the rotation of the backrest frame 9, When 10 is engaged with the guide hole 67, it becomes a non-engaged state, the horizontal shaft 10 idles in the guide hole 67 regardless of the rotation of the backrest frame 9, and the rear rotation arm 54 is moved upward. The rail mode is switched by maintaining the standing state by the lock mechanism 65.

In this case, the different diameter portion 70 of the horizontal shaft 10 is fitted in the engagement groove 66 in the armrest mode, but is relatively fitted so as not to be fitted in the engagement groove 66 in the rail mode. The upper lock mechanism 6 when tilted and in the rail mode
The armrest link 56 is fixed by 5. Further, it is preferable that the upper surface side of the different diameter portion 70 is formed so that the upper portion is narrower and wider toward the lower side, so that the engagement with the engagement groove 66 becomes smooth. Thus, the front side rotation arm 51 is divided into an upper arm 71 and a lower arm 72, and the upper arm 71 and the lower arm 72 are configured to extend and contract with each other, and the axial distance between the horizontal shaft 52 and the horizontal shaft 53. To be able to change. In the embodiment, the upper arm 71 is formed of a plate member, and the pair of sliding cylinders 73 is fixed to the lower portion of the rear surface (inner surface) of the upper arm 71 to form a pair of shaft-shaped lower arms 72.
Is inserted into the sliding cylinder 73. 74 is a stopper provided on the upper part of the lower arm 72, and 75 is a stopper for stopping the reduction of the upper arm 71 and the lower arm 72.

[0015]

[Operation] Next, the operation will be described. Reclining motor 1
When 1 is rotated, the reclining rod 12 contracts, and the backrest frame 9 pivots rearward (downward) around the horizontal axis 10. When the reclining motor 11 is rotated in the reverse direction, the reclining rod 12 extends and the backrest frame 9 rotates forward (upward) about the horizontal shaft 10. Then, when the tilting motor 30 is rotated, the tilting rod 31 extends. Since the tilt rod 31 pushes the arm 32 of the footrest frame 22 forward, the footrest frame 22 starts to rotate upward around the footrest rotation shaft 25. In this case, since the seat side arm 21 provided on the seat frame 16 and the footrest side arm 24 provided on the footrest frame 22 are provided with stopper surfaces 26, respectively.
When 2 and the seat frame 16 are flush with each other (substantially horizontal), the stopper surfaces 26 of the seat-side arm 21 and the footrest-side arm 24 come into contact with each other to restrict upward rotation of the footrest frame 22, Place the footrest frame 22 in the bed mode position.

Further, when the tilt rod 31 is further extended, the upward rotation of the footrest frame 22 with respect to the seat frame 16 is stopped, and the seat frame 16 and the footrest frame 22 are integrally centered on the shaft 18. Turn upwards to enter the exhibition mode. On the contrary, when the seat frame 16 and the footrest frame 22 are integrally rotated downward from the exhibition mode or the bed mode, and the seat connecting frame 20 of the seat frame 16 contacts the upper surface of the front and rear rod 7. The downward rotation of the seat frame 16 is restricted, and only the footrest frame 22 is rotated downward to set the seating mode. Then, the lower frame 33 of the footrest frame 22 has a footrest-side lower arm 34.
And the step frame 3 is attached to the lower arm 34 on the footrest side.
5, the step side arm 36 is attached to the step rotation shaft 37.
The step frame 35 is rotatably attached to the seat connection frame 20 and the step frame 35 from a storage position located on the back side of the footrest frame 22 to a support position substantially flush with the footrest frame 22. Since the step link mechanism 40 is provided between the stepping frames 35, when the footrest frame 22 is rotated upward by the tilting motor 30, the step frame 35 is first rotated downward about the step rotation shaft 37, and the footrests are rotated. When the footrest frame 22 is substantially flush with the seat frame 16 in the seating mode, the step frame 35 is substantially flush with the footrest frame 22. Become one

In this case, the step link mechanism 40 is
The intermediate portion of the intermediate arm 42 is rotatably attached to the bracket 41 of the upper frame 23 of the footrest frame 22 by the attachment shaft 43, and the upper end (rear end) of the step link rod 44 in the front-rear direction is attached to one end of the intermediate arm 42. It is attached by the shaft 45, and the lower end (front end) of the step link rod 44 is the step arm 36.
Is attached to the other end (lower end) of the intermediate arm 42 by a shaft 48, and the rear end of the operating link rod 47 is attached to the seat side arm 21 by a shaft 49. Since the step link rod 44 located on the back side of the footrest frame 22 is moved by the intermediate arm 42 about the attachment shaft 43, the steplink rod 44 is moved forward with respect to the footrest frame 22 by a predetermined distance. The rod 44 rotates the step frame 35 from the storage position located on the back side of the footrest frame 22 to a support position that is substantially horizontal to the footrest frame 22 around the step rotation shaft 37. That is, the tilting motor 30 causes the tilting rod 3 to move.
When 1 extends, the footrest frame 22 moves the footrest rotation shaft 25.
Although the mounting shaft 43 to which the intermediate arm 42 is mounted pivots forward around the footrest rotating shaft 25, the actuating link rod 47 rotates the center of the shaft 49 below the footrest rotating shaft 25. As a result, the operating link rod 47 acts so as to pull the lower end of the intermediate arm 42, and the shaft 45 advances with respect to the shaft 49, and this length (distance) is adjusted by the step link rod 44. Moves, and therefore the step frame 35 in the retracted position pivots to the support position.

Therefore, a motor or the like for rotating the step frame 35 becomes unnecessary. Then, since the step frame 35 rotates about the step rotation shaft 37 with respect to the footrest frame 22, the footrest frame 22
The footrest frame 2 without making a gap with the front end of the
The length of 2 is extended and it becomes bed mode. Further, as the lower end of the footrest frame 22 moves away from the floor surface, the amount of downward rotation of the step frame 35 increases, and when the tip of the step frame 35 is located a predetermined distance above the floor surface, the tip of the footrest frame 22 is located. Since it is set so as to start rotating toward the front side with reference to, the step frame 35 is located on the back side of the footrest frame 22 in the seating mode and does not interfere with the foot of the seated person, The foot surface is brought into contact with the floor surface, and when the footrest frame 22 is rotated upward to enter the bed mode, the length of the footrest frame 22 can be extended to support the foot of the seated person. That is, the step frame 35 is expected to have an effect of compensating for the length of the footrest frame 22 in the bed mode, and the step frame 35 itself has a predetermined thickness. When it is located on the front side of the step frame 35, the seat surface height is set by the seat frame 16 from the upper surface of the step frame 35, and the seat surface height at the initial position becomes high. Therefore, it is not preferable, and it is difficult to achieve both the low setting of the seat height and the extension of the footrest frame 22 in the bed mode, but by making the present application, the low setting of the seat height at the initial position, Footrest frame 22 in bed mode
It is compatible with securing the length of.

As described above, although the multipurpose chair frame body 1 is displaced, when it is put together, the backrest frame 9 is flush with the substantially horizontal seat frame 16, footrest frame 22 and step frame 35. When the seat mode 16, the footrest frame 22, and the step frame 35 are further rotated upward and the backrest frame 9 is rotated downward, the step frame 35 side is high and the back frame is high. The frame 9 side is low, and the mode is changed to the exhibition mode. Then, the multipurpose chair frame body 1
An armrest frame 50 is provided on one side or both sides of the left and right sides, and the armrest frame 50 is formed in a parallel link shape by an armrest link 56 composed of a front side rotation arm 51 and a rear side rotation arm 54, and a rear side rotation. An upper lock mechanism 65 and a lower mode switching mechanism 68 are provided on the upper and lower portions of the arm 54, respectively. The upper lock mechanism 65 switches the rotation of the armrest link 56 between locking and unlocking, and the lower mode switching mechanism 68 controls the armrest link. Since the rotation of 56 is switched to the armrest mode in which the backrest frame 9 is matched and the rail mode in which it is not matched, the upper lock mechanism 65 is unlocked and the lower mode switching mechanism 68 is set to the armrest mode. , The armrest link 56 rotates with the back-and-forth rotation of the backrest frame 9. While moving the door frame 50 around the armrest mode held in a substantially horizontal state.

When the upper side lock mechanism 65 is locked and the lower side mode switching mechanism 68 is set to the rail mode, the armrest frame 50 is always positioned at a predetermined position regardless of the back and forth rotation of the backrest frame 9, and the rail It becomes a mode. In this case, the upper lock mechanism 65 is provided with a lock guide member 58 that is substantially concentric with the horizontal shaft 55 on the armrest frame 50, and the lock hole 5 is provided in the lock guide member 58.
9 is provided, an engaging member 60 that engages with the lock hole 59 is movably provided on the mounting plate 61 of the rear turning arm 54, and the engaging member 60 is urged to engage toward the lock hole 59. Spring 63 is provided, and the lock hole 59 is provided in the rear turning arm 5.
4 is provided at a position where the engaging member 60 is fitted in the rail mode, the engaging member 60 is disengaged from the lock hole 59 by the operating member 62.
The armrest link 56 is held in an unlocked state only by slidingly contacting the outer circumference of the armrest 8. Therefore, the armrest link 56 operates in response to the rotation of the backrest frame 9. When the armrest frame 50 is moved from the armrest mode to the predetermined position in the rail mode, the lock hole 5
The engaging member 60 is engaged with the spring 9 by the elastic force of the spring 63, and the angle between the armrest frame 50 and the rear rotation arm 54 is fixed, whereby the operation of the armrest link 56 is fixed, and the rail mode is set.

In the lower mode switching mechanism 68, however, the different diameter portion 70 of the horizontal shaft 10 is engaged with the engaging groove 66 of the switching hole 69 in the armrest mode, and the horizontal shaft 10 is mounted on the back frame 9.
The rotation of the horizontal shaft 10 causes the rear rotation arm 54 to rotate back and forth through the engagement groove 66. Therefore, the horizontal shaft 10 that rotates in response to the rotation of the backrest frame 9 causes the armrest link 56 to move back and forth while keeping the armrest frame 50 in a substantially horizontal state in accordance with the rotation of the backrest frame 9 to enter the armrest mode. To do. Further, when the horizontal shaft 10 is fitted into the guide hole 67 of the switching hole 69, the horizontal shaft 10 and the guide hole 67 have the same diameter, so that the horizontal shaft 10 idles in the guide hole 67, and therefore the rear side rotation is performed. The moving arm 54 does not rotate back and forth. Then, only when the engaging member 60 engages with the lock hole 59 to lock the locking guide member 58, the horizontal shaft 10 fits into the guide hole 67, and the horizontal shaft 10 fits into the engaging groove 66. Engagement member 6 when mated
Since the orientation of the horizontal shaft 10, the orientation of the engaging groove 66, and the position of the lock hole 59 are set so that 0 does not lock the locking guide member 58 by engaging with the lock hole 59, the upper lock The mechanism 65 and the lower mode switching mechanism 68 are prevented from mechanically locking.

That is, in the embodiment, when the engaging member 60 engages with the lock hole 59 to lock the locking guide member 58, the engaging groove 66 is positioned substantially vertically, and at this time, the horizontal axis 10 The tilted state of the backrest frame 9 prevents the mechanical lock of the lower mode switching mechanism 68 in the rail mode, and the tilted horizontal shaft 10 engages the engaging groove 66. The rear rotation arm 54 tilts when engaged with the lock hole 5 in the armrest mode.
The mechanical lock that the engaging member 60 engages with 9 is prevented. Thus, the front side rotation arm 51 is divided into an upper arm 71 and a lower arm 72, and the upper arm 71 and the lower arm 72 are configured to extend and contract with each other.
Since it is configured so that the inter-axis distance to 3 can be changed,
Even if a foreign matter enters between the armrest frame 50 and the seat frame 16 while the backrest frame 9 rotates backward, the distance between the horizontal shaft 52 and the horizontal shaft 53 increases, so that the foreign matter is not caught. To prevent. That is, the armrest frame 50
When a foreign substance enters between the seat frame 16 and the seat frame 16 and an attempt is made to lift the armrest frame 50, the upper arm 71
The sliding cylinder 73 slides with respect to the lower arm 72, widens the space, and when the sliding cylinder 73 moves for a predetermined distance, the sliding cylinder 73 contacts the stopper stopper 74 on the upper part of the lower arm 72. When the sliding cylinder 73 is returned to its original position after the movement, the stopper 75 contacts the upper end of the lower arm 72 and stops the lowering of the upper arm 71. In this case, since the upper arm 71 is formed in a plate shape, the upper arm 71 is provided with a sliding cylinder 73, and the axial lower arm 72 is slidably inserted into the sliding cylinder 73, the number of parts is small. The expansion mechanism can be achieved with. The names such as "reclining" and "tilt" are given to the constituent parts, and the terms such as "seating mode" are used for explanation, but this is for ease of understanding.
It is not limited by these names and words.

[0023]

According to the present invention, the upper supporting frame 6 is provided above the supporting lower frame 2 placed on the floor, and the backrest frame 9 and the seat frame 16 are rotatably attached to the upper supporting frame 6, In the case where the base of the footrest frame 22 is rotatably provided on the front side of the frame 16 and the stepframe 35 is provided on the footrest frame 22, the step frame 35 is located on the back side of the footrest frame 22. The step frame 35 is configured to be rotatable from the storage position to a support position substantially flush with the footrest frame 22, and the step frame 35 is rotated between the seat frame 16 and the step frame 35 by the rotation of the footrest frame 22. Since the frame of the multipurpose chair is provided with the step link mechanism 40 that can be moved, the step frame 35 rotates about the step rotation shaft 37. The length of the footrest frame 22 can be extended without making a gap with the front end of the footrest frame 22, and since it is stored on the back side of the footrest frame 22, the initial position of the seat frame 16 can be adjusted. The seat height can be set low, and both the seat height can be set low and the foot length in the bed mode can be secured at the same time. According to the present invention, when the footrest frame 22 in the seating mode position rotates upward, the step link mechanism 40 first rotates the step frame 35 downward about the step rotation shaft 37 so that the tip end of the step frame 35 moves. When it crosses over the lower extension line of the footrest frame 22, the footrest frame 22 is inverted and starts to rotate upward, and when the footrest frame 22 is substantially flush with the seat frame 16 in the sitting mode, the step frame 35 is moved to the footrest frame 22. Since it is a frame of a multipurpose chair configured to be substantially flush with, it is possible to reduce the cost by simplifying the configuration for displacing to the supporting position while storing it on the back side of the footrest frame 22. In the present invention, the step link mechanism 40 includes the bracket 4 provided on the footrest frame 22.
1, the intermediate portion of the intermediate arm 42 is rotatably attached, and one end of the intermediate arm 42 has the lower end attached to the step frame 35.
The upper end of the step link rod 44 attached to
To the other end of the intermediate arm 42, the tip ends of the operating link rods 47 attached to the seat frame 16 side are rotatably attached, and one end of the intermediate arm 42 is attached to the tip end of the operating link rods 47. Since the frame of the multipurpose chair is configured to separate as the hanging frame 22 rotates upward, the mechanism for displacing the hanging frame 22 from the retracted position to the supporting position includes a motor for rotating only the step frame 35. It becomes unnecessary and can be configured simply.

[Brief description of drawings]

FIG. 1 is a side view of a frame body (seating mode).

FIG. 2 is a side view showing a state in which the footrest frame is moved upward.

FIG. 3 is a side view of the armrest shown in FIG. 2 in a rail mode.

FIG. 4 is a side view showing a state where the backrest frame is rotated rearward.

FIG. 5 is a side view of a footrest frame and a step link mechanism portion.

FIG. 6 is a side view of the footrest frame and the step link mechanism portion.

FIG. 7 is a schematic perspective view of a step link mechanism.

FIG. 8 is a plan view of a step link mechanism, a seat frame, and a footrest frame portion.

FIG. 9 is a schematic explanatory diagram of a displacement state of the step frame.

FIG. 10 is a schematic perspective view of a left half portion of the frame body.

FIG. 11 is a schematic perspective view of a left half portion of the frame body.

FIG. 12 is an exploded view of the rear arm of the armrest frame.

FIG. 13 is an exploded perspective view of a lock mechanism.

FIG. 14 is a perspective view of an armrest mode state.

FIG. 15 is a perspective view of a rail mode.

FIG. 16 is an explanatory diagram of an armrest mode.

FIG. 17 is an explanatory diagram of a rail mode.

FIG. 18 is a side view of the front arm in a normal state.

FIG. 19 is a side view of the front arm in the extended state.

FIG. 20 is a perspective view of the front arm in a normal state.

FIG. 21 is a perspective view of the front arm in the extended state.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Multipurpose chair frame main body, 2 ... Support lower frame, 4 ... Rolling wheel, 5 ... Lifter mechanism, 6 ... Upper support frame, 7 ... Front / rear rod, 8 ... Rear bracket, 9 ... Back frame, 10 ... Horizontal axis , 11 ... Reclining motor, 12
… Reclining rod, 13… Mounting rod, 14… Shaft,
15 ... Standing part, 16 ... Seat frame, 17 ... Rear frame, 1
8 ... Shaft, 19, 20 ... Seat connecting frame, 21 ... Seat side arm, 22 ... Footrest frame, 23 ... Upper frame, 24 ...
Footrest side arm, 25 ... Footrest rotation axis, 26 ... Stopper surface,
30 ... Tilt motor, 31 ... Tilt rod, 32 ...
Arms, 33 ... Lower frame, 34 ... Lower arms on foot side, 35
… Step frame, 36… Step side arm, 37…
Step rotation shaft, 40 ... Step link mechanism, 41 ...
Bracket, 42 ... intermediate arm, 43 ... mounting shaft, 44 ...
Step link rod, 45 ... Shaft, 46 ... Shaft, 47 ... Actuating link rod, 48 ... Shaft, 49 ... Shaft, 50 ... Armrest frame, 51 ... Front rotation arm, 52 ... Horizontal shaft, 53 ... Horizontal shaft, 54 ... rear side rotating arm, 55 ... horizontal axis, 56 ... armrest link, 58 ... locking guide member, 59 ... locking hole, 60 ... engaging member, 61 ... mounting plate, 62 ... operating member, 63 ... spring, 65 ... upper lock mechanism, 66 ... engagement groove, 67 ... guide hole, 68 ... lower switching mechanism, 69 ... switching hole, 71 ... upper arm, 72 ... lower arm, 73 ... sliding cylinder, 74 ... retaining stopper, 75 ... Stopper.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hironori Shinoh             Parama, 2-14-5 Higashisuna, Koto-ku, Tokyo             Untobed Co., Ltd. Development Division F-term (reference) 3B099 AA03 BA04 BA10 DA02                 4C341 MM04 MM11 MN09 MP02 MP03                       MP05 MQ03

Claims (3)

[Claims] 1. An upper supporting frame 6 is provided above a supporting lower frame 2 placed on a floor, and a back frame 9 and a seat frame 16 are rotatably attached to the upper supporting frame 6, and the seat frame 16 is provided. Footrest frame 22 on the front side of
In which the base portion of the footrest portion 22 is rotatably provided, and the footrest portion frame 22 is provided with a step frame 35. A step link mechanism 40 is provided between the seat frame 16 and the step frame 35 so that the step frame 35 can be turned by the turning of the footrest frame 22. Frame of multipurpose chair. 2. The step link mechanism 40 according to claim 1, wherein when the footrest frame 22 in the seating mode position rotates upward, the step frame 35 first rotates downward about a step rotation shaft 37. Step frame 35
When the tip end of the footrest crosses the lower extension line of the footrest frame 22, it is inverted and starts to rotate upward, and when the footrest frame 22 becomes substantially flush with the seat frame 16 in the sitting mode, the step frame 35 is put on the footrest A frame of a multipurpose chair configured to be substantially flush with the subframe 22. 3. The step link mechanism 40 according to claim 2, wherein an intermediate portion of an intermediate arm 42 is rotatably attached to a bracket 41 provided on the footrest frame 22, and one end of the intermediate arm 42 is attached. The upper end of the step link rod 44 in the front-rear direction having the lower end attached to the step frame 35 is rotatably attached to the upper end of the actuating link rod 47 attached to the seat frame 16 side at the other end of the intermediate arm 42. A frame of a multipurpose chair configured such that one end of the intermediate arm 42 separates from the tip of the operating link rod 47 as the footrest frame 22 rotates upward.