Fire escape – ladder – or scaffold – Wall- or floor-attached
Reexamination Certificate
2007-06-12
2007-06-12
Chin-Shue, Alvin (Department: 3634)
Fire escape, ladder, or scaffold
Wall- or floor-attached
C182S146000, C403S385000
Reexamination Certificate
active
10947522
ABSTRACT:
The present invention provides a support clamp device for a safety rail or similar device adapted for mounting on a pump jack pole comprising: a first pole clamp, circumscribing a generally rectangular perimeter, the first pole clamp comprising a generally U-shaped bar having a first side; a second side and a third side, wherein the first and third sides are approximately parallel to each other and the second side is approximately perpendicular to the first and third sides and wherein the second side further comprises an aperture; and a fourth side removably attached to the first and third sides opposite and approximately parallel the second side; and a second pole clamp, circumscribing a generally rectangular perimeter, the second pole clamp comprising a generally U-shaped bar having a first side; a second side and a third side, and a pole clamp connecting fastening means, the first pole clamp and the second pole clamp are able to pivotably rotate about the axis formed by the pole clamp connecting fastener.
REFERENCES:
patent: 2722440 (1955-11-01), Percy
patent: 4432435 (1984-02-01), Anderson
patent: 4566819 (1986-01-01), Johnston
patent: 5143413 (1992-09-01), Vandenhoek
patent: 5307899 (1994-05-01), Lubinski
Chin-Shue Alvin
Stein Steven B.
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