Fluid powered apparatus for operating a mechanism during an...

Details Fluid powered apparatus for operating a mechanism during an... Fluid powered apparatus for operating a mechanism during an...

2006-10-03

2006-10-03

Look, Edward K. (Department: 3745)

Motors: expansible chamber type

With motive fluid valve

Inlet fluid supplemented by controlled fluid pressurized in...

C091S005000

Reexamination Certificate

active

07114431

ABSTRACT:
An apparatus includes a reservoir of a pressurized fluid connected to a supply conduit. A fluid powered actuator has a first port and an second port. A volumetric flow regulator has a valve element that controls fluid flow between an inlet chamber which receives fluid from the supply conduit and an outlet chamber connected to the first port of the fluid powered actuator. A sensing orifice is coupled between the inlet chamber and the outlet chamber of the volumetric flow regulator, such that the valve element varies flow of fluid between the inlet chamber and the outlet chamber in response to a pressure differential across the sensing orifice. This apparatus ensures relatively constant velocity operation of the fluid powered actuator under varying load conditions. A damping mechanism is disclosed for slowing the fluid powered actuator as an end of its travel approaches.

REFERENCES:
patent: 3031845 (1962-05-01), Ludwig
patent: 4083187 (1978-04-01), Nagashima
patent: 4821625 (1989-04-01), Sundberg
patent: 5168705 (1992-12-01), Hirata et al.
patent: 5832805 (1998-11-01), Kurashima et al.
patent: 6279315 (2001-08-01), Harju
patent: 6666476 (2003-12-01), Rink et al.
patent: 6685139 (2004-02-01), Blum et al.
patent: PCT/EP2003/012374 (2004-05-01), None

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