US 3479086 A
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CHAIR FOR PHYSICALLY HANDICAPPED PERSONS Nov. 18, 1969 vjA. sHl-:RlDAN 3,479,086
CHAIR FUR PHYSICALLY HANDICAPPED PERSONS med Dec. 4, 1967 :s sheets-sheet 2 Sl S2 S3 S4 O o G 0 /A/V/V VERNCNI` ARTHUR SHERIDAN United States Patent O Inf. c1. A412 3/20, 1/00 U.S. Cl. 297-330 2 Claims ABSTRACT OF THE DISCLOSURE The invention consists in a chair characterized in having a frame and seat supported from the frame and lifting means for raising and tilting the seat while occupied by Ia person.
- The invention relates to a chair for physically handicapped persons, and in particular to those persons either by disease, injury or old age, having diiculty in rising to their feet from a sitting position, while the object of the invention is to provide a chair which will assist the rising .of the occupant to a standing position and vice versa.
The invention relates to a chair wherein the improvement comprises a frame and seat supported from the frame and lifting means for raising and tilting the seat while occupied by a person.
The invention further pertains to ya chair as set forth in the preceding paragraph in which the lifting and tilting means is driven by an electric motor. The lifting and tilting means may comprise a worm and nut, and a lever system between the frame yand nut and the seat.
The invention further relates to a chair as set forth above in which the lifting and tilting means is pneumatic means. The pneumatic means may include a bellows and a motion guide means comprising a lever system between the frame and seat. The pneumatic lifting means may be operated by a cylinder of compressed gas supported upon the frame of the chair or the pneumatic lifting means may be operated by a hand operated pump, or still further the pneumatic lifting means may be operated by a compressor powered by an electric motor, both built into the chair.
The invention further relates to a chair as set forth above having arm supports associated with the seat, and which are raised and tilted with the seat.
The invention still further relates to a chair as set forth Iabove having switch means upon one arm of the chair for the control of the movement of the seat by the occupant.
The accompanying drawings show, by way of example only, two embodiments of the invention in which:
FIGURE 1 is a view in side elevation of a first embodiment, but without upholstery,
FIGURE 2 is a View in rear elevation of the chair,
FIGURE 3 is a circuit diagram of the chair of FIG- URES 1 and 2,
FIGURE 4 is la view in side elevation of a further embodiment,
FIGURES 5 and 6 are perspective views illustrating the lowered and raised positions respectively of the chair.
In the embodiments of FIGURES 1 and 2 the chair has a frame of wood of conventional construction, comprising a bottom horizontal member 1, upright front and back members 2, arms 3 and wing members 4. The chair is also provided with horizontal rails 5 at the front, back and sides.
The seat of the chair is constructed as a four sided box like structure with an open front and top, a sloping back icel 6 and sloping sides 7 supported upon a laminated board 8. The chair illustrated in FIGURES 1 and 2 is without its upholstery and covering, so as to more clearly show the raising and lowering mechanism. From FIGURES 5 and 6 it may be seen that the seat is provided with a cushion 9 and upholstered arm rests 10, whichl latter are slightly recessed in the under side, so as to iit over the arms of the frame. The arm rests are of such a depth as to prevent the fingers being curled underneath and trapped between the former and the arms of the frame.
The seat is supported upon a pair of crossover levers 11 and 12 on each side of the chair, which are hingedly joined by a nut and bolt 13. The lower ends of levers 11 are hinged upon a nut land bolt 14 fastened to a U-section metal frame 15 by a bracket 16. The frame 15 is supported upon a laminated board or metal frome 17 resting on the horizontal wood bottom members down by the bolts 18.
The upper end of each lever 11 is provided with a roller 19 which engages within a channel member 20, fastened to the underside of the laminated board 8 which constitutes the seat bottom, while the upper end of each lever 12 is hingedly connected to the seat bottom 8 by a bracket 21 and nut and bolt 22. The upper ends of levers 11 are joined by the angle section 23.
The lower ends of thc levers 12 are hingedly mounted by brackets 24 and nut and bolts 25 to opposite end of slide 26, which engages with the U-Section frame 15, and which is slidable towards and away from the rear of the chair. When the slide member is moved to the rear position, the seat is lowered into the normal position as shown by the chain dotted lines. When the slide is moved into the forward position, it is lifted and tilted from the normal position of FIGURE 5, and adopts the attitude shown by the full lines in FIGURE 1, and the occupant is raised into a convenient position for taking the weight on the feet, as shown in FIGURE 6.
In the embodiment shown in FIGURES l land 2, thereV is provided a screw threaded nut 27 on a screw threaded shaft 28 supported for rotation in bearing blocks 29 and 30, and rotated by an electric motor 31. The motor is reversible and can either be of the low speed type, and be directly connected to the shaft 28, or there can be provided a gear box therebetween at position 32 on the shaft 28. When the shaft rotates, the nut is moved along the shaft and the seat is moved from one position to the other.
The slide 26 carries a plate 33 which contacts microswitches 34 and 35 to stop the motor at the extreme positions of the seat. The operation of lifting and lowering is controlled by a switch 36 on the arm of the seat, and comprises as shown in FIGURE 3, a three position arrangement of four sets of contacts S1, S2, S3, and S4, ganged together. Contacts S1 and S2 operate to reverse the motor 31, while contacts S3 and S4 act to short circuit respectively the micro-switches 34 and 35. The central position allows the electrical circuit to be disconnected from mains 36A by way of the contacts S4.
The action of the switching means of FIGURE 3 is Ias follows: at one extreme position of the seat, microswitch 34 or 35 will have been opened by the plate 33. By moving these switches to the appropriate position, the motor is reversed and the opened micro-switch is short circuited with the result that the motor starts in the appropriate direction, and continues rotating until the other micro-switch is opened by the plate 33, at which instant, the motor stops. On moving the switch 36 again, the motor is again reversed and the cycle is repeated in the other direction. The blank contact on each set of contacts acts to isolate the circuits during the reversal process.
Connection with the main supply can be made by a Yexible cable 37 connected to the back of the chair by a plug and socket 38.
In the embodiment shown in FIGURE 4, the seat is connected to and guided in its movement by a pair of cross-over levers as for the previous embodiment, but instead of the bottom ends of the levers 12 being moved backwards and forwards by a screw and nut arrangement, they ,are free to slide, and a bellows 39 is provided below the seat which is inflated from a source of gas under pressure which is controlled by a valve 40 Operated by a lever 41.
The source of gas under pressure is not shown in FIG- URE 4, but the gas enters the pipe 42, and when it is required to lift the seat, the valve is operated to direct the gas by way of pipe 43 to the bellows. When the seat has reached its limit of movement, which is governed by a cord 44, the lever is moved to a central position and the supply of gas is arrested. When the lever is moved to the third position, the gas in the bellows is released by way of a pipe 45. As the cord 44 is released, it is wound on a spool 46 by a helical spring. There may also be provided a pressure operated valve which closes the supply when a predetermined pressure has been built up in the bellows, when the elevated position has been reached.
The source of gas under pressure may be a compressor powered by an electric motor, both of which are built into the chair. Alternatively, the gas under pressure may be provided by a replaceable gas bottle, while in a still further arrangement the chair may be provided with a compressor which is operated manually by a lever, by the occupant of the chair, there being provided a valve which can be opened to release the pressure in the bellows when the seat has to be lowered, and which is closed when the compressor is operated by hand. The chair may be provided with such upholstery as necessary to make it as comfortable as a normal chair, and to be indistinguishable from such a chair, while it can have a variety of designs to suit the user.
The chair has the particular advantage that, beside lifting the occupant to a standing height, the seat is also tilted and moved forward to bring lthe weightiof the body over the feet, and consequently little effort is required by persons weak in the legs or who must not exert themselves.
1. An armchair having means by which a seat may be lifted and tilted forwardly while occupied by a person in which the improvement comprises a frame below the seat and an arrangement of levers for each side of the chair, said arrangement of levers including a pair of levers pivoted one upon the other intermediate their ends, one end of each lever in each pair being hinge'dly connected to the frame towards the front of the chair and the front of the seat respectively, the other end of each lever in each pair being slidable upon the frame and seat respectively towards and away from the rear of the latter, a screw threaded rod, an electric motor for driving the screw threaded rod, a nut on said Screw threaded rod, and said nut being connected to the ends of the levers slidable upon the frame to slide the latter towards the front of the chair to lift and tilt the seat vand provide forward motion of the seat upon rotation of the screw threaded rod by the motor.
2. The armchair as claimed in claim 1 in which the point at which the levers are pivoted one upon the other at each side of the chair is nearer the hinged end of each lever than the slidable end of each lever.
References Cited UNITED STATES PATENTS 2,053,852 9/1936` Tracy.
2,442,303 5/ 1948 Mayeld 297-332 X 2,641,305 6/1953 Oishel 207-330 X 3,138,402 6/1964 Heyl et al 297-330` X 3,218,102 1v1/1965 Specketer 297-330 3,250,569 5/1966 Gaffney 297-330 3,343,871 9/1967 Yates et al. 297-323 BOBBY R. GAY, Primary Examiner G. O. FINCH, Assistant Examiner