Movable support for rotatable extend/retract screw in telescopic

Details Movable support for rotatable extend/retract screw in telescopic Movable support for rotatable extend/retract screw in telescopic

1980-02-19

1981-11-03

Oresky, Lawrence J.

Traversing hoists

Having vertically swinging boom

Having means to swing boom vertically

212230, 212264, B66C 2306

Patent

active

042981280

ABSTRACT:
A telescopic boom comprises inner and outer boom sections; an elongated rotatable screw rotatably mounted on the outer section; a first thread on the screw engaged with a first nut on the inner boom section whereby screw rotation effects telescopic movement of the inner boom section and a second thread of smaller lead superimposed on the first thread and engaged with a second nut mounted on a support which is movably mounted on the outer boom section whereby screw rotation also effects axial movement of the support at a slower rate than telescopic movement of the boom sections to a position wherein it supports the mid-section of the screw.

REFERENCES:
patent: 3174634 (1965-03-01), Peck
patent: 3800965 (1974-04-01), Barron et al.
patent: 3836011 (1974-09-01), Sakamoto et al.
patent: 4169338 (1979-10-01), Eik

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