Elongated-member-driving apparatus – With means to move or guide member into driving position – Including supply magazine for constantly urged members
Reexamination Certificate
2011-04-05
2011-04-05
Smith, Scott A. (Department: 3721)
Elongated-member-driving apparatus
With means to move or guide member into driving position
Including supply magazine for constantly urged members
C277S436000, C173S001000
Reexamination Certificate
active
07918375
ABSTRACT:
A pneumatically operable fastener-driving tool and seal mechanism assembly, and a method of operating the same, comprises the use of a single, annular seal member, having a substantially V-shaped cross-sectional configuration, disposed within an annularly recessed portion of the fastener-driving tool piston in such a manner that the open region of the V-shaped annular seal member is disposed toward the relatively high-pressure upstream end portion of the fastener-driving tool cylinder, while, conversely, the closed region of the V-shaped annular seal member is disposed toward the relatively low-pressure downstream end portion of the pneumatic tool cylinder Accordingly, the relatively high-pressure air acts upon the radially outwardly flared lip portion of the annular seal member during a power stroke, while relatively low-pressure air acts upon the radially outwardly flared lip portion of the annular seal member during a return stroke, whereby only a single V-shaped annular seal member is required to achieve proper sealing performance characteristics throughout an operative cycle of the fastener-driving tool.
REFERENCES:
patent: 4530455 (1985-07-01), Vornberger
patent: 5169160 (1992-12-01), Gaskill et al.
patent: 5431415 (1995-07-01), Millonig et al.
patent: 6189894 (2001-02-01), Wheeler
patent: 6290235 (2001-09-01), Albertson
Curtis Patrick J.
Johnson Michael P.
Illinois Tool Works Inc.
Law Offices of Steven W. Weinrieb
Smith Scott A.
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