Constant drag device

Details Constant drag device Constant drag device

1982-11-23

1985-10-08

Stoner,, Jr.,

Brakes

Rod

16 85, 16DIG17, 49386, 74531, 267 9R, 267 71, B65H 5910

Patent

active

045453225

ABSTRACT:
A stretchable tube-like sleeve surrounds and frictionally grips an inner rod or tube. A coil spring surrounds the sleeve in position to resist movement of one end of the sleeve against the spring force. Moving the rod axially relative to the spring in a direction against the spring force on the sleeve decreases the inner diameter of the sleeve to produce a drag on the inner member. Movement of the opposite end of the sleeve is limited by a stop. This causes the sleeve to expand and allows the rod to slip with a constant drag which is determined by the strength of the spring. With the spring force in position to be applied to only one end of the sleeve, movement of the inner member in the opposite direction provides only a minimal drag as determined by the initial frictional interference between the sleeve and the inner member. Positioning the spring to resist movement of either end of the sleeve, provides a constant drag on the inner member with either direction of movement of the rod relative to the sleeve.

REFERENCES:
patent: 2088450 (1935-07-01), Tea et al.
patent: 2732787 (1952-05-01), Herlach
patent: 2808903 (1956-01-01), Kovac
patent: 3053526 (1962-09-01), Kendall
patent: 3116056 (1963-12-01), Maier
patent: 3332523 (1967-07-01), Chambers
patent: 3696891 (1972-10-01), Poe
patent: 3765053 (1973-10-01), Anweiler
patent: 3783738 (1974-01-01), Pelat
patent: 3805608 (1974-04-01), Schmidt et al.
patent: 3866724 (1975-02-01), Hollnagel
patent: 4054190 (1977-10-01), Wilkes
Ordinance Department publication 20-342, pp. 63-66, U.S. Patent Office, (Date not available, but it is understood to be prior art.).

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