Cutting – Rotatable disc tool pair or tool and carrier – With means to support work relative to tool
Reexamination Certificate
2000-01-24
2002-01-01
Rachuba, M. (Department: 3724)
Cutting
Rotatable disc tool pair or tool and carrier
With means to support work relative to tool
C083S471300, C083S453000, C083S466000, C083S468300
Reexamination Certificate
active
06334380
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to a circular saw, and more particularly to a clamping device of the circular saw.
BACKGROUND OF THE INVENTION
As shown in
FIG. 1
, a prior art circular saw has a work bench
1
on which a cutting device
2
and a clamping member are mounted. The cutting device
2
has a circular blade
2
a
driven by a motor. The clamping member is formed of a stopping piece
3
and a clamping piece
4
. The stopping piece is fastened pivotally with the work bench
1
by a pivot
5
. The stopping piece
3
is provided with an arcuate angle scale
3
a
to facilitate the cutting of a work piece at a predetermined angle. The clamping piece
4
is fastened pivotally with one end of a movable threaded rod
6
.
In the process of cutting a work piece A at a desired angle, the stopping piece
3
is tilted, in cooperation with the angle scale
3
a
. The work piece A is then placed between the stopping piece
3
and the clamping piece
4
before the threaded rod
6
is advanced to drive the clamping piece
4
to press against the work piece A such that the clamping piece
4
swivels so as to urge the work piece A to tilt. The work piece A is then ready to be cut by the circular blade
2
a
. However, when the stopping piece
3
is swiveled on the pivot
5
for a greater angle, especially at the time when the stopping piece
3
is swiveled in a clockwise direction, one end of the stopping piece
3
is contiguous to the blade
2
a
and is moved away from the cutting position. As a result, when the clamping piece
4
holds the work piece A the clamping force F
1
exerted via the threaded rod
6
is imparted to the work piece A and the stopping piece
3
from the clamping piece
4
. In view of the stopping piece
3
having a limited area for resting the work piece A, the clamping force F
1
exceeds the outermost side of the stopping piece
3
to form a couple of forces, thereby resulting in the work piece A being held insecurely. As a result, the quality of the work of cutting the work piece A by the blade
2
a
is seriously compromised.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a circular saw with a clamping device capable of holding securely a work piece.
In keeping with the principle of the present invention, the foregoing objective of the present invention is attained by a circular saw comprising a work bench, a cutting device, and a clamping device which is mounted on the work bench and is provided with a stopping member and a clamping member. The stopping member can be adjusted in angle, whereas the clamping member can be adjusted in displacement and rotation. The stopping member is provided in a side wall thereof with a slide member capable of sliding along the side wall in a constant track direction. The slide member has a rest portion which is adjustable in its position such that the rest portion becomes an extension of the side wall of the stopping member thereby resulting in an increase in the surface area of the side wall to enhance the effect of holding securely the work piece.
REFERENCES:
patent: 5016510 (1991-05-01), Gardner
patent: 5109742 (1992-05-01), Strong
patent: 5161443 (1992-11-01), Huang
patent: 5297463 (1994-03-01), O'Banion et al.
patent: 5483858 (1996-01-01), Chen
patent: 5720096 (1998-02-01), Dorsey
patent: 5755148 (1998-05-01), Stumpf et al.
patent: 5845555 (1998-12-01), Dawley
Browdy and Neimark
Duro Machinery Corp.
Rachuba M.
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