Adjustable stiffness jack spring actuator

Details Adjustable stiffness jack spring actuator Adjustable stiffness jack spring actuator

2011-08-09

2011-08-09

Williams, Thomas J (Department: 3657)

Spring devices

Coil

Including end thrust member

C267S177000, C267S174000

Reexamination Certificate

active

07992849

ABSTRACT:
The present invention is a mechanical element, commonly referred to as a “Jack Spring” that is based upon the concept of adding and subtracting coils from a spring. In particular, with the method and apparatus of the present invention, by changing the number of coils in a spring, the actual or intrinsic stiffness of the spring is structurally changed. A very simple and practical method is used to adjust the number of coils. The Jack Spring actuator of the present invention is based upon adjusting the effective structure of a spring.

REFERENCES:
patent: 973641 (1910-10-01), Dysart
patent: 1404464 (1922-01-01), Meyer
patent: 1704472 (1929-03-01), Grandjean
patent: 3141660 (1964-07-01), Clarke et al.
patent: 4529179 (1985-07-01), Seyler
patent: 4634109 (1987-01-01), Cigolotti et al.
patent: 6676118 (2004-01-01), Chou
patent: 6681908 (2004-01-01), Davis
patent: 2003/0178758 (2003-09-01), Metelski

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