Crewseat with adjustable lumbar and thigh supports

Details Crewseat with adjustable lumbar and thigh supports Crewseat with adjustable lumbar and thigh supports

1993-05-25

1995-05-30

Brown, Peter R.

Chairs and seats

Bottom or back with means to alter contour

Located at the front of the seat bottom

2972844, A47C 714

Patent

active

054196140

ABSTRACT:
The present invention relates to crewseats for aircraft such as helicopters, and to thigh support and lumbar support mechanisms for such crewseats. The thigh support mechanism is a tilt plate hingeably attached to a base plate, and a locking tang extending downward from the tilt plate to engage a lock lug attached to the base plate. The lumbar support mechanism is a flex plate between the seat back cushion and the rigid back of the crewseat. The degree of bow in the flex plate can be adjusted by moving an adjustment lever up or down, thus rotating a cam shaft, and a lift cam attached to the cam shaft. The lift cam increases or decreases the amount of bow in the flex plate, according to the position of the adjustment lever.

REFERENCES:
patent: 3762769 (1973-10-01), Poschl
patent: 4153294 (1979-05-01), Meiller et al.
patent: 4165126 (1979-08-01), Strien et al.
patent: 4324431 (1982-04-01), Murphy et al.
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patent: 4469374 (1984-09-01), Kashihara et al.
patent: 4491365 (1985-01-01), Murakami
patent: 4531779 (1985-07-01), Hashimoto
patent: 4725095 (1988-02-01), Benson et al.
patent: 4834455 (1989-05-01), Proctor
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patent: 5007677 (1991-04-01), Ozawa et al.
patent: 5088790 (1992-02-01), Wainwright et al.
patent: 5174526 (1992-12-01), Kanigowski
Beach, A., "A Review of the Pilot Backache Problem in the CH113 Labrador Helicopter," Defence and Civil Institute of Environmental Medicine, Dec. 1985.
Goede, M., "Backache in Helicopter Pilots," Flight Lines Aviation Newsletter, pp. 64-67.

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