Extensible boom

Details Extensible boom Extensible boom

1999-11-05

2000-11-28

Walsh, Donald P.

Implements or apparatus for applying pushing or pulling force

Apparatus for hauling or hoisting load, including driven...

Device includes rotatably driven, cable contacting drum

254342, 254376, 211117, 248327, B66D 136

Patent

active

061524263

ABSTRACT:
An extensible boom or strut has a telescoping action easily adjusted for appropriate length, and further is capable of attachment to a fixed point such as on a ceiling or wall at one end, and a lighting fixture or such at the other end. A torque tube is engaged with a cable winding device for playing out and winding up the cable which pulls on the innermost segment of the boom to shorten it or relaxes to allow gravitational force to lengthen it.

REFERENCES:
patent: 580896 (1897-04-01), Quackenbush
patent: 847196 (1907-03-01), McBee
patent: 1178343 (1916-04-01), Woodworth
patent: 1222242 (1917-04-01), Woodworth
patent: 3512743 (1970-05-01), Lispcomb
patent: 4647014 (1987-03-01), Ekman
patent: 4695040 (1987-09-01), Hantschk
patent: 5083395 (1992-01-01), Daniels
patent: 5176365 (1993-01-01), Best
patent: 5205544 (1993-04-01), Kroeger
patent: 5607143 (1997-03-01), Regal

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