JPH0751099B2 - Chair - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair having adjustable small wheels.

[0002]

2. Description of the Related Art Conventionally, the height of a seat portion of a chair is adjusted by a screw that is placed below a seat portion of a chair after a person sitting on the chair descends from the chair. The height of the rod was adjusted by rotating the rotating nut of the rod, but this work was quite troublesome, especially for the elderly and sick, requiring the assistance of others.

The present invention solves this problem. A person sitting on a chair can adjust the height of the seat portion he or she desires while sitting on the chair, and moreover, the small wheels freely retract into the lower portion of the seat portion. It provides a chair that can be a seat chair because it is locked.

[0004]

The gist of the present invention will be described with reference to the accompanying drawings.

A seat frame 4 is provided on the base plate 2 via a pantograph mechanism 3, and a seat portion 6 having a backrest 5 on the seat frame 4.
And an adjusting mechanism 7 for adjusting and fixing the height of the seat frame 4 by simultaneously moving the lower ends of the front and rear X-shaped supporting legs of the pantograph mechanism 3 toward and away from each other by the adjusting screw rod 14 on the base 2. Protrusion and sinking vertical rails 33 are provided on the left and right sides of the base 2 so as to be opposed to each other, and a guide roller 34 is rotatably provided in the vertical and vertical rails 33 for protruding and retracting. The base ends of a pair of left and right inner oblique arm 37 for protruding and retracting and outer oblique arm 38 for projecting which are configured in a ∧ shape by axially attaching the parts to each other The freewheel 1 is hung from the base end of 37 ・ 38,
The front and rear guide rollers 34 are simultaneously moved toward and away from each other by the projecting and retracting screw rod 28 to change the inclination angles of the inner and outer projecting and retracting arms 37 and 38 to project and retract the small wheel 1 freely. 8 is provided, and the adjusting mechanism 7 and the projecting / withdrawing mechanism 8 are set at a position where a person sitting on the chair can operate while sitting on the chair.

[0006]

When the person sitting on the chair having the small wheel 1 operates the adjusting mechanism 7 while sitting on the chair, the adjusting screw rod 14 is used to support the X-shaped front and rear support of the pantograph mechanism 3 between the base 2 and the seat frame 4. The line of action of the weight of the person sitting on the chair with the lower ends of the legs moving toward and away from each other at the same time always moves up and down on the pivotal joint in the center of the X-shaped support legs in front of and behind the pantograph mechanism 3. Since the height of the part 6 can be adjusted up and down,
Adjust the height of the seat portion 6 of the chair to a desired height and fix it.

In this state, if the user sits on a chair and kicks on the floor with his / her feet or the like, the chair runs on the small wheels 1 so that he / she can reach a desired place while kicking on the floor with his / her feet or the like.

Further, when the height of the seat portion 6 of the chair is lowered to the floor by the adjusting mechanism 7 and the projecting and retracting screw rod 28 is rotated by the projecting and retracting mechanism 8, the torque is increased by the screw mechanism of the projecting and retracting screw rod 28. The front and rear guide rollers 34 in the vertical sash 33 for sunk / downward simultaneously rotate away from each other, so that the front and rear sloping inner slant arm bodies 37, front and rear slanting outer slant arm bodies 38
Since the angle of inclination of the chair becomes loose and the small wheel 1 is retracted into the frame of the base 2 of the chair, the chair becomes a sitting chair on the spot.

Similarly, the projecting and retracting mechanism 8 reversely rotates the projecting and retracting screw 28 to simultaneously rotate the front and rear guide rollers 34 in the projecting and retracting vertical rail 33 in close proximity so that the small wheel 1 is projected on the floor. Let it be used as a chair with small wheel 1.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show an embodiment of the present invention.

The adjusting mechanism 7 will be described.

The front and rear horizontal crosspieces 2a and 2b are formed of hollow square members, and the left and right vertical crosspieces 2c and 2d are formed in a rectangular shape by forming the openings of the C-type lightweight mold members toward the inside. At the center of the cross rails 2a and 2b in the front and rear of the base 2, two bearing parts 11 are provided on the left and right.
The standing plates 13a and 13b having a, 12a, 11b and 12b are vertically fixed and fixed, and the bearings 11a and 11b (the bearing on the left side in FIG. 1)
An adjustment screw rod 14 having a right screw portion 14a and a left screw portion 14b near both ends is rotatably attached to the shaft.
A reduction gear 15 is fitted and locked at the base end of 14, a small gear 16 is meshed with this reduction gear 15, and an electric motor 18 is inserted into the shaft hole of this small gear 16.
The output shaft of the speed reducing mechanism 17 connected to the base 2 is fitted and locked, and the speed reducing mechanism 17 and the electric motor 18 are locked to the board 2f projecting rearward of the base plate 2.

The seat frame 4 below the seat portion 6 of the chair is formed into a substantially rectangular shape in conformity with the shape of the seat portion 6, and the horizontal crosspieces 4a and 4b at the front and rear of the seat frame 4 are made of hollow square members, and left and right. Vertical bar 4c
4d is made of a C-shaped lightweight material similar to the vertical bars 2c and 2d of the base 2, and the left and right intervals of the vertical bars 4c and 4d are set to correspond to the vertical bars 2c and 2d of the base 2 and Vertical cross 2
Guide pieces 2e, 4e having a rectangular cross section are welded to the inner center portion of the lower flange of the C-shaped lightweight member of the c. 2d and the vertical bars 4c, 4d, and abutted and engaged with the guide pieces 2e, 4e.
A lower guide roller 19 and an upper guide roller 19 'having a guide groove 19a in the outer diameter central portion which can be freely rollably rotated between the lower flange portion of the C type lightweight member and the vertical web by using e.4e as guides. Arrange the upper and lower guide rollers
The lower guide roller shaft 20 and the upper guide roller shaft 20 'are fitted and locked in 19 and 19'.

The lower left front lower roller shaft 20 of the base 2 and the seat frame 4
Between the left rear upper roller shafts 20 'and between the right front lower roller shaft 20 of the base 2 and the right rear upper roller shaft 20' of the seat frame 4 and the outer oblique arm rods 21c and 21d on the left rear side of the base 2. Between the lower roller shaft 20 and the left front upper roller shaft 20 'of the seat frame 4 and the base 2
The inner oblique arm rods 22c and 22d are laid between the right rear lower roller shaft 20 and the right front upper roller shaft 20 of the seat frame 4 via a spacer 24 in a pantograph-like X structure, and the respective ends are lower and upper. Of the outer oblique arm rod 21
c and the inner oblique arm rod 22c, and the outer oblique arm rod 21d and the inner oblique arm rod 22d are pivotally attached by pivot pins 23 and 23 at corresponding positions near the center, respectively, and the base end portions of the outer oblique arm rods 21c and 21d Spacer 24 between the inner surfaces of
The lower transverse arm (front) 25a is horizontally installed via 24, and both ends thereof are pivotally attached to the lower guide roller shafts 20 and 20, and the other end is pivotally attached to the upper guide roller shafts 20 ′ and 20 ′. Lock each with nut 27.

Further, a lower transverse arm (rear) 25b is provided laterally between the inner side surfaces of the base ends of the inner oblique arm rods 22c and 22d, and is pivotally attached to the lower guide roller shafts 20 and 20, and the other end is an upper portion. Guide roller shaft 20 '
・ Pivot to 20 'and lock with nut 27.

A right female screw cylinder 25 'and a left female screw cylinder 25 "are vertically provided at corresponding positions of the adjusting screw rods 14 of the lower transverse arm bodies 25a and 25b.

When the reduction gear 15 is rotated clockwise by operating the electric motor 18 by the reduction mechanism 17 to rotate the reduction gear 15 in the clockwise direction in FIG. The lower guide rollers 19, 19 of the lower transverse arm 25a, 25b roll in the vertical bars 2c, 2d to approach by the screw mechanism of the front and rear right and left female threaded cylinders 25 ', 25 ". Therefore, the upper guide rollers 19 ', 19' are brought closer to each other by the pantograph mechanism 3 by the pivotal pin 23, and as a result, the height of the seat portion 6 can be increased.

When the rotation of the electric motor 18 is rotated in the opposite direction to the above, the movement is reversed and the height of the seat portion 6 can be reduced.

The thrust mechanism 7 will be described.

In the bearings 12a and 12b (the bearing on the right side in FIG. 1) of the standing plates 13a and 13b which are erected on the front and rear cross rails 2a and 2b of the base 2, the right screw portion 28a and the left screw portion are the same as above. A projecting and retracting screw rod 28 having a portion 28b is rotatably attached to the shaft, and the projecting and retracting screw rod 28 is attached.
The reduction gear 29 is fitted and locked at the base end of the gear, the small gear 30 is meshed with the reduction gear 29, and the electric motor 32 is inserted into the shaft hole of the small gear 30.
The output shaft of the reduction mechanism 31 for connecting the two is fitted and locked, and the reduction mechanism 31 and the electric motor 32 are locked to the board 2f of the substrate 2.

A vertical bar 33 for protrusion and withdrawal made of a C type lightweight material in a state of being opposed to the left and right slightly inward of the vertical bars 2c and 2d of the base plate 2.
The c and 33d are attached in parallel with the vertical bars 2c and 2d with the openings of the C type lightweight mold facing inward, respectively, and the front and rear ends are the base 2
Welded to the horizontal rails 2a and 2b of the vertical rails 33c and 33d
A rectangular guide piece 33e, which is similar to the vertical bars 2c and 2d of the adjusting mechanism 7, is attached in the lower flange.
A guide roller 34 having a guide groove 34a at the center of the outer diameter capable of rolling freely in the C piece light weight piece material with 3e as a guide is arranged in each of the vertical bars 33c and 33d for protrusion and recession in the front, rear, left and right directions. The guide roller shaft 35 is fitted and locked in the guide roller 34.

Inner oblique arm 37c for protrusion and depression having an appropriate length
The base end of 37d is pivotally attached to the front guide roller shafts 35, 35 via the spacers 36, 36, and the other end is projected obliquely upward and rearward, and has the same length as the projecting and retracting inner oblique arm 37c, 37d. A guide roller shaft is provided at the rear end of the base end of the outer oblique arm 38c / 38d for protrusion / depression having an appropriate length.
The other end of the inner oblique arm 37c for projecting and retracting, the outer oblique arm for projecting and retracting 38c, the inner oblique arm for projecting and retracting
The other protruding ends of the 37d and the slanting outer oblique arm 38d are pivotally connected to each other by pivoting pins 39, 39 in a ∧-shaped manner, and the inner slanting arm 37c, 37d for collapsing and projecting.
A transverse arm (front) 40a for projecting and retracting is provided laterally between the inner surfaces of the base end of d, and both ends thereof are pivotally fitted to the front guide roller shafts 35, 35 and locked by the nut 41.

Similarly, the sunk lateral arm (rear) 40 through the spacer 36 between the inner side surfaces of the proximal ends of the sunk outer oblique arm bodies 38c and 38d.
b is installed horizontally, both ends of which are pivotally attached to the rear guide roller shafts 35, 35 and locked by nuts 40.
The right female screw cylinder 40 'and the left female screw cylinder 40 "are hung vertically at the corresponding positions of the thrust rod 28.

Locking arms 37 ', 38' are provided in a standing manner at the base end portions of the inner and outer slant arm bodies 37c, 37d for projecting and retracting and the outer slanting arm bodies 38c, 38d for projecting and retracting respectively. Free wheel 1 with spin structure at the tip of 37 '・ 38' 1 L-shaped horizontal arm 43 hung vertically
Lock with.

When the reduction gear 29 whose speed has been reduced by the reduction mechanism 31 is rotated counterclockwise in FIG. 1 by operating the electric motor 32, the projecting and retracting screw rod 28 fitted and locked in the reduction gear 29 also rotates,
Front and rear thrusting arms 40c and 40d that are screwed to this
With the screw mechanism of the right and left female screw cylinders 40 ', 40 ", the guide rollers 34 of the horizontal arm arms 40a, 40b for protruding and retracting are the vertical bars 33c for protruding and retracting.
・ Rotating in 33d and moving away from each other, the pivot pins 39 and 39 rotate downward with the guide roller shaft 35 as a fulcrum, and are attached to the base end in the opposite direction. Since the wheel 1 rises in the opposite direction, the ground contact portion of the small wheel 1 floats above the floor, and the bottom portion of the base 2 abuts on the floor, so that the person sits down and becomes a sitting chair.

When the rotation of the electric motor 32 is rotated in the clockwise direction opposite to the above, the movement is reversed and the small free wheel 1 comes into contact with the floor so that the chair can be used as a so-called chair with the small free wheel 1.

The lower and upper guide rollers are also provided.
It is desirable to insert roller bearings into the holes of 19 and 19 'and the guide roller 34 to make the rotation smoother.
Further, the configuration of the present invention can be applied to a chair having a small wheel 1 in which the seat portion 6 of the chair rotates freely and the backrest 5 reclines.

[0028]

According to the present invention having the above-described structure, when a person sitting on a chair operates the adjusting mechanism while sitting on the chair, the adjusting screw pivots to move the X-shape before and after the pantograph mechanism between the base and the seat frame. Since the lower ends of the support legs move toward and away from each other at the same time, the height of the seat can be adjusted more quickly by the structure that adjusts the height of the seat by moving only the lower end of one side of the pantograph mechanism. Since the lower ends of the X-shaped support legs were moved toward and away from each other at the same time, the weight of the person sitting on the chair always moved up and down on the pivotal joint in the center of the front and rear X-shaped support legs, and The load is evenly applied to the support legs, so there is stability, and the seat of the chair can be freely adjusted to the desired height without giving the occupant a sense of instability. When the operating lever is rotated, the screw action of the projecting and retracting As the wheel becomes larger, the front and rear guide rollers in the vertical sash for sunk / retract can be moved away from / close to each other so that the freewheel can be retracted / protruded into the base of the chair. It is a convenient and excellent chair that does not require the assistance of others for the elderly and sick.

[Brief description of drawings]

FIG. 1 is a perspective view showing the structure of an embodiment of the present invention.

FIG. 2 is a side sectional view in which a part of the adjusting mechanism according to the embodiment of the present invention is cut away.

FIG. 3 is a rear view in which a part of the freewheeling portion of the embodiment of the present invention is cut away.

FIG. 4 is a side view of an adjustable small wheel according to an embodiment of the present invention.

FIG. 5 is a side view in which a part of the guide roller is cut away as seen from the inside of the embodiment of the present invention.

FIG. 6 is a rear view in which a part of the guide roller of the present invention is cut away.

[Explanation of symbols]

 1 Small wheels 2 Base 3 Pantograph mechanism 4 Seat frame 5 Backrest 6 Seat 7 Adjustment mechanism 8 Collapsing mechanism 14 Adjustment screw rod 28 Collapsing screw rod 33 Collapsing vertical bar 34 Guide roller 35 Guide roller shaft 37 Collapsing Arm 38

Claims (1)

[Claims] 1. A seat frame is provided on a base through a pantograph mechanism, and a seat portion having a backrest is provided on the seat frame,
An adjustment mechanism that allows the lower ends of the front and rear X-shaped support legs of the pantograph mechanism to simultaneously move toward and away from the base by adjusting screw rods to adjust the height of the seat frame and fix it, and to vertically project in the left and right sides of the base. The crosspieces are provided facing each other, a guide roller is rotatably provided in the vertical crosspiece for protrusion and depression, and the other end of the protrusion is pivotally attached to the guide roller shaft of the guide roller. The base ends of the pair of inner and outer slant arm bodies for protrusion / depression are pivotally attached, and small free wheels are hung vertically from the base ends of the inner / outer arm bodies for protrusion / depression. A guide-roller mechanism is provided that allows the guide roller to be swung toward and away from each other at the same time by the push-and-pull screw to change the tilt angle of the inner and outer collapsing and retracting arms so that the small wheel can be pushed and retracted downward. A chair characterized in that the collapsing and retracting mechanism is set to a position where a person sitting on the chair can operate it while sitting on the chair.