Adjustable torsion bar assembly

Details Adjustable torsion bar assembly Adjustable torsion bar assembly

1984-04-24

1986-07-01

Butler, Douglas C.

Spring devices

Torsion

5136, 5164R, F16F 114

Patent

active

045975680

ABSTRACT:
An adjustable torsion bar assembly (10) includes a torsion bar frame (9) having upstanding legs (17, 18) and a structural frame (22) for holding a tip-up bed (11). A pair of torsion rods (20, 21) extend between a frame leg and a structural frame side. A lead screw (31) having threaded portions (32, 33) threaded in opposed helices extends between the structural frame sides which upon rotation moves a pair of pivot plates (35, 36) either inwardly or outwardly in unison. Each pivot plate includes a torsion rod-confining aperture (53, 54) in sliding engagement with a portion of a torsion span of rods as rotation of the lead screw adjusts the movement of the pivot plates along the rods changing the effective span of the torsion rods. The adjusting feature thus allows varying but equal degrees of stored energy in each of the torsion rods when they are twisted resultant from vertical to horizontal movement of the structural frame with respect to the torsion bar frame, the latter of which is fixed with respect to a support floor or wall.

REFERENCES:
patent: 3116494 (1964-01-01), Bennett et al.
patent: 3179956 (1965-04-01), Bennett
patent: 3490756 (1970-01-01), Spier
patent: 4318195 (1982-03-01), Reppas

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