CREWSEAT WITH ADJUSTABLE LUMBAR AND THIGH SUPPORTS

摘要

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 (25) is a tilt plate (49) hingeably attached to a base plate (21), and a locking tang (37) extending downward from the tilt plate to engage a lock lug (10) engaged to the base plate. The lumbar support mechanism (34) is a flex plate (36) between the seat back cushion (35) and the rigid back (17) of the crewseat. The degree of bow in the flex plate can be adjusted by moving an adjustment lever (26) up or down, thus rotating a cam shaft (29), and a lift cam (30) 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.