Electrical, telescopic jack

Details Electrical, telescopic jack Electrical, telescopic jack

B - Operations, Transporting

66

F

B66F 7/00 (2006.01) B66F 3/10 (2006.01) B66F 3/18 (2006.01) B66F 3/44 (2006.01)

Patent

CA 2080761

Abstract Electrical telescopic jack A hoisting device is disclosed, in particular for use in test fields of aircrafts such as helicopters and small airplanes, comprising an ?, electrically operated assembly provided with coaxial sleeves slidable by being screwed to one another, and a telescopic rod integral with the base of the jack and located at the centre of the sleeve assembly, the last extensible arm of said rod being rotatably connected to the innermost sleeve along which said arm can axially slide. The outermost sleeve is rotated by a threaded bush, which is itself rotated by a worm screw/crown gear mechanism, and is unscrewed by reaction from the threaded bush as all of the remaining sleeves engaged with one another are prevented from rotating by the telescopic rod. This is also the case in the following steps for the remaining sleeves without the need of retaining the jack.

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