Expansible chamber devices – With releasable latch means between working member and power...
Patent
1989-05-08
1992-03-10
Look, Edward K.
Expansible chamber devices
With releasable latch means between working member and power...
92248, 92249, 92255, 604218, 604110, 403348, F01B 900
Patent
active
050941488
ABSTRACT:
A piston stem insert to be received within a hollow receptacle that is molded at the interior of a carpule based piston, so that a piston stem may be easily attached to and detached from the piston by way of the insert. In a first embodiment of the invention, a set of flexible, anti-displacement wings extend radially from the insert to releasable and frictionally engage the inside walls of a carpule, so as to prevent an inadvertent and premature displacement of the piston through the carpule. In a second embodiment, a set of anti-rotation wings extend radially from the piston stem insert to be received within respective cavities of the receptacle that are shaped so that the wings may be rotated in a single (e.g. clockwise) direction but blocked from rotation in an opposite direction. In a third embodiment, the receptacle of the piston is sized and shaped relative to the anti-rotation wings, such that said wings will be automatically aligned for receipt within the cavities of the receptable during the installation of the insert.
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Foster Clark B.
Haber Terry M.
Lewis, Jr. John A.
Smedley William H.
Denion Thomas
Habley Medical Technology Corporation
Look Edward K.
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