Piston-cylinder unit

Details Piston-cylinder unit Piston-cylinder unit

2007-04-03

2007-04-03

Nguyen, Hoang (Department: 3748)

Expansible chamber devices

Piston with rigid axially extending hollow stem

Hollow stem forms axially extending fluid passage

C092S113000

Reexamination Certificate

active

11081423

ABSTRACT:
Piston-cylinder unit including a working cylinder; a piston attached to a piston rod and installed with freedom of axial displacement in the working cylinder; and fastening elements, at least one of which is screwed into a threaded bore in the piston rod, where the interior pressure in the working cylinder holds a valve in the bore of the piston rod against an end surface of the fastening element. A vent groove leading to the atmosphere is provided between the end surface and the valve to create a pressure gradient to the working space, the groove being provided between the inner surface of the piston rod and the fastening element.

REFERENCES:
patent: 2081921 (1937-06-01), Gartin
patent: 2789510 (1957-04-01), Meynig
patent: 3063423 (1962-11-01), Riordan
patent: 6223649 (2001-05-01), Beck et al.
patent: 2004/0065194 (2004-04-01), Varetto et al.

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