Surgery – Truss – Perineal
Patent
1990-04-12
1991-07-23
Burr, Edgar S.
Surgery
Truss
Perineal
128 49, 128 52, 128 60, A61H 100, B60N 100
Patent
active
050334581
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an arrangement for a seat intended to be fitted in the back-rest of the seat in order to massage the back of a person sitting in the seat.
A person sitting in a seat activates certain groups of muscles, principally located in the back, in order to maintain an upright seated position. The muscle groups are then stressed primarily statically. After a greater or lesser period of time this muscle strain results in the muscles becoming tired and, in serious cases, also being subject to cramp. This leads to feelings of discomfort, which remain even after sitting has ended. These problems are especially troublesome for people who are forced by their work to remain seated for long periods of time, for example professional chauffeurs, and also people, for example those confined to wheelchairs, who are forced for other reasons to remain seated for long periods.
It is known per se that muscle cramps can be eased by means of massage. However, this is a method of treatment which, for practical reasons, is used only when the discomfort has reached a very painful stage. Massage is usually administered by hand, but mechanical arrangements also exist which attempt to simulate the treatment provided by a masseur. It is known, for example in U.S. Pat. Specification No. 4,422,448, to design a seat with a massage arrangement fitted in the back-rest. The massage arrangement is in this case made up of two rings, which are rotatably mounted on two eccentric discs. The discs are rotatable about a horizontal shaft. By means of a control system the distance between the discs can be adjusted, as can the vertical position of the shaft. It is thereby possible to control the area of the back which is to be massaged.
However, since the known massage arrangement has been designed so as to be able to massage a number of different muscle groups, the arrangement has proven complicated and, as a result of this, also expensive. The seat is primarily intended to be used in treatment establishments in order to replace manual massage.
In connection with seats for vehicles it is known, according to international Patent Specification WO 85/00029, to design the back-rest with an oscillating support, which is movable in the vertical direction. It is thus possible to expose primarily the skin of the back to a vibrating movement, which may provide a pleasant sensation. On the other hand, the deeper-lying muscle groups in the back remain essentially unaffected. Tiredness and cramp in the muscles cannot therefore be remedied using the arrangement described.
The present invention relates to an arrangement which has as its object to remedy the discomfort experienced upon lengthy periods of sitting in a seat, by means of massaging certain specific muscle groups in the back. A further object of the invention is that it should have a simple construction and be inexpensive to produce. In addition, it should have small dimensions so that it can be fitted in conventional seats, for example vehicle seats.
According to the invention these objects are achieved by virtue of the arrangement being designed in. The invention includes two identical pulsators to be accommodated in recesses intended for this purpose in the padding material of the backrest of the seat, on each side of a vertical line of symmetry of the backrest. Each pulsator has a respective electrically operated driving motor. A housing with an open front side, opening toward the front surface of the seat backrest, accommodates a plurality of massage elements which are in the form of flaps supported on vertically oriented rotary shafts. The motors which drive the shafts that rotate the flaps supported thereon are connected to a common electrical control system. During a time limited work cycle, which may last about one minute, the flaps are alternately rotated for a period of time, like 7 seconds, and stopped for an identical period of time. The motor connection to the flap rotating shafts enables the shafts to alternately rotate back and forth, moving the edges of the fl
REFERENCES:
patent: 799881 (1905-09-01), Wells
patent: 4005703 (1977-02-01), Rosen et al.
patent: 4101816 (1978-07-01), Shepter
patent: 4748972 (1988-07-01), Hasegawa
Burr Edgar S.
Raciti Eric P.
Saab-Scania AB
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