Device with at least one extension arm or support arm for...

Details Device with at least one extension arm or support arm for... Device with at least one extension arm or support arm for...

2006-03-07

2006-03-07

Lazo, Thomas E. (Department: 3745)

Expansible chamber devices

Piston with rigid axially extending hollow stem

C092S260000, C029S888042

Reexamination Certificate

active

07007590

ABSTRACT:
The invention relates to a device with at least one extension arm or support arm for multi-linked crane shaped extension arms, concrete spreader columns and similar, comprising at least one hydraulic differential cylinder for actuating a support arm. The cylinder comprises a hollow piston rod which has a tubular segment and two end pieces arranged on the ends of said segment, whereby at least one of the end pieces is welded on to the segment thereof. The welded joint is machined and the root of the weld is eliminated. At least one of the end pieces comprises a through opening which enables tool access in order to machine the hollow cavity of the hollow piston rod.

REFERENCES:
patent: 3147671 (1964-09-01), Geyer
patent: 4003297 (1977-01-01), Mott
patent: 4058178 (1977-11-01), Shinohara et al.
patent: 884880 (1953-07-01), None
patent: 2224659 (1974-10-01), None
patent: 2140362 (1984-11-01), None

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