Metal deforming – With means to drive tool – Including pneumatic- or fluid-actuated tool support
Reexamination Certificate
2011-04-12
2011-04-12
Jones, David B (Department: 3725)
Metal deforming
With means to drive tool
Including pneumatic- or fluid-actuated tool support
C072S453020, C072S453060, C072S453080, C072S453130, C091S061000, C091S451000, C074S089360, C092S136000
Reexamination Certificate
active
07921689
ABSTRACT:
An improved method and apparatus are provided for constructing and operating a linear actuator, and equipment incorporating a linear actuator, by operatively connecting a pressure biasing pneumatic arrangement between the driving member and the driven member of a mechanical linear actuator for applying a unidirectional biasing force between the driving and driven members, along an axis of motion, regardless of the location or movement of the driving and driven elements with respect to one another along the axis of motion. The pneumatic biasing arrangement is also configured, connected and operated to reduce the force which must be exerted by the driving and driven members in extending and retracting the linear actuator. The pneumatic biasing arrangement may further be configured for preferentially aiding extension or retraction of the actuator.
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Anderson Robb G.
Beck Thomas L.
McCrickard James P.
Jones David B
Reinhart Boerner Van Deuren P.C.
Unico, Inc.
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