Bore seal telescopic hoist

Details Bore seal telescopic hoist Bore seal telescopic hoist

2005-09-06

2005-09-06

Look, Edward K. (Department: 3745)

Expansible chamber devices

Piston

Nonmetallic portion

C092S253000, C092S051000

Reexamination Certificate

active

06938538

ABSTRACT:
A bore seal telescopic hoist is formed of a series of telescopically arranged tubular sections each having a circumferential reservoir. A circumferential wiper is lodged in the reservoir and is used to collect debris or dirt which may be present on the inner wall of an adjacent tubular section.

REFERENCES:
patent: 4003297 (1977-01-01), Mott
patent: 5983778 (1999-11-01), Dawson

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