JP2012050721A - Liftable chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liftable chair allowing a senior person or a person with a disability to readily adjust the height of a seat portion, and having reduced production cost.SOLUTION: The liftable chair includes: a movable body 10 in which upper front support legs 11 and an upper rear support leg 12 lifting along a pair of lower front support legs 3 and a lower rear support leg 4 of a support body 1, are connected by an armrest plate 13, and horizontal rods for connecting the upper front support legs 11 and the upper rear support leg 12, are mounted with a seat portion 16; and a lifting device for adjusting the height of the movable body 10. The lifting device stores rods in horizontal grooves formed in a pivoted cam plate in a retractable manner, the inner ends of the rods are connected to the cam plate and the outer ends are inserted into the upper front support legs and the upper rear support leg, movable racks projecting and retreating in a transverse direction relative to the axial direction of the rods are provided in the upper front support legs 11 and the upper rear support leg 12, the movable racks are engaged to fixed racks oppositely provided in vertical grooves in the lower front support legs 3 and the lower rear support leg 4, the rod is moved forward to fit the outer end into a locking hole formed in the movable rack, the movable body 10 is fixed to a support body 1, and the seat 16 is adjusted to a desired height.

Description

  The present invention relates to a liftable chair capable of adjusting a seat portion to a height corresponding to a seat height.

  JP-A-2003-33245 and Utility Model Registration No. 3005679 disclose a chair that can adjust the height of a seat.

The lifting chair of the above-mentioned Japanese Patent Application Laid-Open No. 2003-33245 includes a lifting device composed of a pair of left and right X-shaped links capable of regulating the height of the seat and the leg,
The rack member attached to the rear leg is composed of a lock member attached to the seat and biased toward the rack member, and an elevating operation device provided with an operation lever of the lock member.
Operate the operating lever, retract the lock member against the spring to release the engagement with the rack member, and move the seat held horizontally by the lifting device to the specified height, then operate The hand is released from the lever, the lock member is advanced by the spring force, and is engaged with the rack member to maintain the height of the seat portion.
In other words, this lifting chair adjusts the height of the seat portion by the rear lifting operation device while maintaining the horizontal state of the seat portion by the lifting device comprising the left and right X-shaped link mechanisms. Is complicated and the production cost is high. Further, when raising and lowering the seat portion, the hand cannot be released from the lifting lever that is heavy by the spring. Moreover, since the operation lever is located on the rear side of the seat portion, there is an inconvenience that an adjustment operation must be performed by turning to the rear side of the chair.

  The above-mentioned utility model registration No. 3005679 chair is designed to raise and lower the upper leg with respect to the lower leg and adjust the height of the seat fixed to the upper leg. Since it is necessary to remove a plurality of bolts each time, the operation is cumbersome and not suitable for the elderly or disabled.

JP 2003-33245 A Utility Model Registration No. 3013962

  SUMMARY OF THE INVENTION An object of the present invention is to provide an elevating chair that can easily adjust the height of a seat for both elderly and disabled persons, and can reduce production costs.

The liftable chair according to claim 1 of the present invention has a lower front support leg established at both ends of an inverted U-shaped base, a lower rear support leg established at the rear of the base, and a pair of left and right lower front support legs, A support formed with longitudinal grooves having openings on the inner side surfaces from the upper ends of the lower rear support legs, and
A pair of left and right upper front support legs that move up and down along the vertical grooves of the pair of left and right lower front support legs and lower rear support legs on the support body and the upper ends of the upper rear support legs are connected by inverted U-shaped armrest plates, and a pair of left and right upper parts The lower ends of the front support leg and the upper rear support leg are connected by a connecting member composed of a horizontal rod in the left-right direction and a horizontal rod in the front-rear direction, and a movable body in which a seat is placed on the connecting member,
An elevating chair comprising a lifting device that moves the movable body up and down and adjusts the height of the seat,
In the lifting device, a cam plate having a forward operation lever is pivotally mounted on the upper surface of the central portion of the horizontal rod in the horizontal direction of the connecting member, and the upper surfaces of the horizontal rods on the left and right and rear sides of the cam plate A horizontal groove is formed in each, and a rod is accommodated in each horizontal groove so that the rod can be moved forward and backward. The inner end is connected to the cam plate, and the outer ends are inserted into the upper front support leg and the upper rear support leg, respectively. In the upper front support leg and the upper rear support leg, a movable rack that protrudes and protrudes in a direction transverse to the axial direction of the rod is provided, and this movable rack is opposed to the inner surface of the vertical groove of the lower front support leg and the lower rear support leg. In this engaged state, the rod is moved forward and the outer end thereof is fitted into a lock hole drilled in the movable rack, thereby moving the movable body. Fix to the support and adjust the seat to the desired height It is a symptom.

  When the movable body is fixed to the support, the cam plate is rotated by the operating lever protruding forward under the seat, and the arc-shaped eccentric slit moves. The accommodated three rods retreat and the outer ends thereof are detached from the lock holes of the movable rack, and the movable rack is released from the locked state. Therefore, when the movable body is moved up and down, the movable rack urged by the spring slides in contact with the fixed rack, and the lock hole matches the front end of the rod each time the movable rack is engaged with the fixed rack. When the seat reaches the desired height, the cam plate is reversely rotated by the operating lever, and the arc-shaped eccentric slit is moved backward, so that each rod moves forward and its outer end fits into the lock hole, allowing it to move. The rack is locked, the upper front support leg is fixed to the lower front support leg, and the upper rear support leg is fixed to the lower rear support leg, respectively, and the support body and the movable body are integrated to hold the seat portion at a desired height.

  The liftable chair according to the first aspect of the present invention operates the operation lever that protrudes forward to the lower side of the seat portion, and simultaneously retracts the three rods, then releases the operation lever and holds both hands. Since it is used to adjust the height of the seat by raising and lowering the movable body, the adjustment operation is easy, and it is optimal for the elderly and the disabled.

  In addition, this elevating chair can move the movable body up and down in a well-balanced manner and adjust the height of the seat by means of an elevating device, so a pair of left and right X-shaped links as disclosed in Japanese Patent Application Laid-Open No. 2003-33245. No mechanism is required. Therefore, the appearance is simple, and there is an effect that it can be produced at low cost.

It is a perspective view which shows embodiment of the raising / lowering chair which concerns on this invention. It is a vertical side view same as the above. It is a cross-sectional view of the lifting device in the same embodiment. It is a longitudinal cross-sectional view of the raising / lowering apparatus in embodiment same as the above. It is a longitudinal cross-sectional view which shows the connection state of the cam board and rod in a raising / lowering apparatus same as the above. It is a longitudinal cross-sectional view which shows the locked state of the movable rack in a raising / lowering apparatus same as the above. It is a cross-sectional view same as the above. It is a perspective view of the locked state of the lifting apparatus same as the above.

  Hereinafter, an embodiment of a liftable chair according to the present invention will be described in detail with reference to FIGS.

  Reference numeral 1 denotes a wooden support. Lower front support legs 3 are established at both ends of an inverted U-shaped base 2, and lower rear support legs 4 are established at the rear of the base 2. The support leg 3 and the lower rear support leg 4 are connected by an inverted T-shaped connecting member 5 including a horizontal rod 5a in the left-right direction and a horizontal rod 5b in the front-rear direction, and the pair of left and right lower front support legs 3 and the lower rear support leg. A vertical groove 7 having an opening 6 on the inner surface is formed from the upper end of 4 to an upper position of the connecting member 5. The vertical groove 7 is formed of an aluminum channel (hereinafter referred to as an aluminum mold member) in which the opening 6 is formed by left and right projecting edges 9a in a notch 8 formed from the inner surfaces of a pair of lower front support leg 3 and lower rear support leg 4. 9).

  Reference numeral 10 denotes a wooden movable body, and a pair of left and right upper front support legs 11 and upper rear support legs 12 which are fitted in the vertical grooves 7 of the pair of lower front support legs 3 and lower rear support legs 4 in the support 1 so as to be movable up and down. The upper ends are connected by a planar inverted U-shaped armrest plate 13, and a backrest 14 is provided on the rear portion of the armrest plate 13 and the upper rear support leg 12. The lower ends of the upper front support leg 11 and the upper rear support leg 12 are connected by an inverted T-shaped connecting member 15 comprising a horizontal rod 15a in the left-right direction and a horizontal rod 15b in the front-rear direction. A seat portion 16 is placed on the horizontal rod 15b in the front-rear direction, and a bifurcated stopper 17 provided on the lower surface of the seat portion 16 is detachably fitted to the horizontal rod 15a and the horizontal rod 15b.

  The upper front support leg 11 and the upper rear support leg 12 are each provided with a slit 18 on both left and right side surfaces, and the slit 18 is fitted to the left and right projecting edges 9a of the vertical groove 7 so as to be movable up and down. The outer portion 11a 12a is fitted into the longitudinal groove 7, and the inner portion 11b 12b is projected from the slit 18 to the inside of the lower front support leg 3 and the lower rear support leg 4.

Reference numeral 19 denotes an elevating device, which is pivotally attached to the central portion of the horizontal rod 15a of the connecting member 15 by a pivot 20 and has an arcuate eccentric slit 21 which advances and retracts three rods described later on the outer peripheral portion. That is, a circular cam plate 23 formed with an eccentric slit 21 whose tip is inclined inward, and a forward-facing operation lever 22 protruding from the front end;
In the left and right horizontal grooves 24 and the rear horizontal grooves 24 formed on the upper surfaces of the horizontal and horizontal horizontal rods 15a and 15b with the cam plate 23 interposed therebetween, are respectively housed in a freely movable manner. A pin 27 provided at the inner end thereof is engaged with an arc-shaped eccentric slit 21 of the cam plate 23, and an outer end is inserted into the through hole 26 of the upper front support leg 11 and the upper rear support leg 12;
A vertically long fixed rack 28 made of Duracon (registered trademark of Polyplastics Co., Ltd.) fixed to the inner surface of the aluminum mold 9 of the lower front support leg 3 and the lower rear support leg 4;
In a case 30 made of Duracon fitted in a notch 29 in the lower part of the upper front support leg 11 and the upper rear support leg 12, it fits in and out in the direction of the fixed rack 28 and is urged by a compression spring 31. And a movable rack 32 made of Duracon always engaged with the fixed rack 28,
The movable rack 32 is formed with a lock hole 33 that matches the rod 27 in the engaged state with the fixed rack 28. A tapered surface 34 is provided around the opening end of the lock hole 33 so that the rod 27 is securely fitted into the lock hole 33.

  In a state where the wooden movable body 10 shown in FIGS. 1 to 4 is fixed to the wooden support 1, the operation lever 22 protruding forward to the lower side of the seat portion 16 is turned to the position shown by the chain line in FIG. 3. When the cam plate 24 is rotated and the eccentric slit 21 is moved, the pins 25 of the three rods 27 are pulled inward, and the rods 27 are retracted so that their outer ends are locked to the movable rack 32. Detach from hole 35. In this unlocked state, when the movable body 10 is moved up and down with the armrest plate 13 or the seat 16, the movable rack 32 urged by the compression spring 31 slides in contact with the fixed rack 28, and the fixed rack. Each time it engages 28, the lock hole 33 matches the front end of the rod 27. When the seat portion 16 reaches a desired height, when the operating lever 22 is returned to the position shown by the solid line in FIG. 3 and the cam plate 23 is rotated backward, the three rods 27 are moved along with the movement of the eccentric slit 21. The pins 25 are pushed outward, the rods 27 are moved forward, the outer ends are fitted into the lock holes 33, the movable rack 32 is locked, and the seat portion 16 is held at a desired height.

  The liftable chair of the above embodiment can lift the movable body 10 with both hands after releasing the rod 27 with the operation lever 22 and then lift the movable body 10 with both hands. Since the slits 11 and 12 are guided by the left and right projecting edges 9a of the aluminum mold 9 of the lower front and rear support legs 3 and 4 and slide lightly, the elevating operation is extremely easy. It can be used as a chair for the elderly and disabled.

DESCRIPTION OF SYMBOLS 1 Support body 2 Base 3 Lower front support leg 4 Lower rear support leg 5 Connection member 7 Vertical groove 10 Movable body 11 Upper front support leg 12 Upper rear support leg 13 Armrest plate 14 Backrest 15 Connection member 16 Seat part 17 Stopping bracket 19 Lifting device 20 Axis 21 Eccentric slit 22 Operation lever 23 Cam plate 24 Horizontal groove 25 Pin 27 Rod 28 Fixed rack 30 Case 31 Compression spring 32 Movable rack 33 Lock hole

Claims (1)

Lower front support legs are established at both ends of the inverted U-shaped base, lower rear support legs are established at the rear of the base, and openings are formed on the inner side surfaces from the upper ends of the pair of left and right lower front support legs and lower rear support legs. A support formed with longitudinal grooves,
A pair of left and right upper front support legs that move up and down along the vertical grooves of the pair of left and right lower front support legs and lower rear support legs and the upper ends of the upper rear support legs are connected by inverted U-shaped armrest plates, The lower ends of the front support leg and the upper rear support leg are connected by a connecting member composed of a horizontal rod in the left-right direction and a horizontal rod in the front-rear direction, and a movable body in which a seat is placed on the connecting member,
An elevating chair comprising a lifting device that moves the movable body up and down and adjusts the height of the seat,
In the lifting device, a cam plate having a forward operation lever is pivotally mounted on the upper surface of the central portion of the horizontal rod in the left-right direction of the connecting member, and the upper surfaces of the horizontal rods on the left, right, and rear sides of the cam plate. A horizontal groove is formed in each, and a rod is accommodated in each horizontal groove so that the rod can be moved forward and backward. The inner end is connected to the cam plate, and the outer ends are inserted into the upper front support leg and the upper rear support leg, respectively. In the upper front support leg and the upper rear support leg, a movable rack that protrudes and protrudes in a direction transverse to the axial direction of the rod is provided, and this movable rack is opposed to the inner surface of the vertical groove of the lower front support leg and the lower rear support leg. In this engaged state, the rod is moved forward and the outer end thereof is fitted into a lock hole drilled in the movable rack, thereby moving the movable body. Fix to the support and adjust the seat to the desired height Features and the elevating chair.

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