Geometrical instruments – Scriber – Parallel line
Reexamination Certificate
1999-10-27
2001-12-04
Bennett, G. Bradley (Department: 2859)
Geometrical instruments
Scriber
Parallel line
C083S455000
Reexamination Certificate
active
06324766
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a clamp, particularly for securing a ruler to a guide.
When working with gypsum wall board panels, it is frequently necessary to score a panel along a line that is accurately parallel to an edge of the panel. This can be done by measuring from the edge of the panel at two locations, marking the panel, setting a straight edge between the marks, and running a knife along the straight edge. However, this is a time consuming and inaccurate operation.
Various guide mechanisms have been proposed for facilitating scoring of wallboard. For example, Kaplan et al, U.S. Pat. No. 4,903,409, discloses a scoring tool which includes a guide that runs against the edge of the panel and a ruler that projects from the guide and overlies the surface of the panel. A knife is fitted to the ruler and is adjustable in position lengthwise of the ruler by releasing and engaging a clamp which receives a knife holder. Also, Peugh et al, U.S. Pat. No. 5,600,892, discloses a drywall panel cutter having a guide which engages the edge of the panel and a ruler which projects perpendicular to the guide and is moveable lengthwise by releasing and engaging a clamp. At one end, the ruler carries a tool for scoring the drywall panel.
The clamps used in wall board scoring and marking tools are generally unsatisfactory and do not hold the ruler firmly relative to the guide or hold the knife holder firmly relative to the ruler.
SUMMARY OF THE INVENTION
In accordance with a first aspect of the invention there is provided a clamp structure for securing an elongate first member having a channel of uniform cross-sectional configuration to a second member, the clamp structure including a frame defining an aperture through which the first member extends, a shoe fitted in the channel and of external cross-section substantially complementary to the cross-sectional configuration of the channel, and a mechanism which forces the shoe into the channel and firmly presses the first member against the frame.
In accordance with a second aspect of the invention there is provided a clamp structure for securing a V-section first member to a second member having a flat surface, comprising a frame attached to the second member and having a first length segment inclined to the flat surface of the second member and a second length segment joining the first length segment to the second member, whereby the frame and the second member define an aperture for receiving the V-section member, a V-section shoe fitted in the channel of the V-section member, and a mechanism urging the shoe firmly into the channel, whereby the V-section member is pressed firmly against the first length segment of the frame and the flat surface of the second member.
REFERENCES:
patent: 3174225 (1965-03-01), Abraham
patent: 3886657 (1975-06-01), Fabian
patent: 3973459 (1976-08-01), Stowe
patent: 3996827 (1976-12-01), Logan
patent: 4158977 (1979-06-01), Logan
patent: 4903409 (1990-02-01), Kaplan et al.
patent: 4949462 (1990-08-01), Spencer
patent: 5048189 (1991-09-01), Aurness et al.
patent: 5103566 (1992-04-01), Stebe
patent: 5272947 (1993-12-01), Peters
patent: 5307716 (1994-05-01), Onishi et al.
patent: 5309642 (1994-05-01), McGinnis
patent: 5471753 (1995-12-01), Rodrigues
patent: 5600892 (1997-02-01), Peugh et al.
patent: 5732472 (1998-03-01), Praye
patent: 6182549 (2001-02-01), Albright et al.
Bennett G. Bradley
Crowe Jason R.
Dukelow Owen W.
Kolisch Hartwell Dickinson & McCormack & Heuser
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