Cutting – Rotatable disc tool pair or tool and carrier – With means to support work relative to tool
Reexamination Certificate
1999-04-23
2001-01-16
Dexter, Clark F. (Department: 3724)
Cutting
Rotatable disc tool pair or tool and carrier
With means to support work relative to tool
C083S473000, C083S477100, C083S490000, C083S581000
Reexamination Certificate
active
06173635
ABSTRACT:
BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention relates to a circular saw, more particularly to an improved base structure of a circular saw which is stable during sawing operation and which allows easy adjustment of inclination angles.
(b) Description of the Prior Art
Sawing devices, such as scroll saws, circular saws, are common wood working tools. Conventional circular saws are disclosed in, for instance, U.S. Pat. No. 4,934,233 (see FIGS.
1
and
2
). U.S. Pat. No. 5,623,860, and R.O.C. Utility Model Patent No. 133040 (Saw Blade Protective Cover Safety Device for Circular Saws). A conventional circular sawing device generally includes a base
1
, a rotatable base plate
2
mounted on the base
1
, and a rotary seat
3
provided on and extending from a rear side of the base
1
. A top edge of the rotary seat
3
is fixedly connected to a pivotal end
4
of a circular saw
5
. When it is necessary to adjust the left and right inclination sawing angle, the left and right inclination angles of the rotary seat
3
can be adjusted to achieve sidewise inclining sawing of workpieces. However, as the rotary seat
3
is located at and extends from the outer side of the base plate
2
, the center of gravity of the entire circular saw
5
is away from the center of the base plate
2
, resulting in loss of stability and shifting of the center of gravity of the circular saw
5
to the back during operation. Furthermore, when the rotary seat
3
rotates with the base plate
2
in level rotational adjustment of positions, if the level rotational angle of the base plate
2
is excessive, the rotary seat
3
will often come into contact with the base
1
on both sides and the surrounding objects, which considerably limits the rotational space and angle of the circular saw
5
, as well as affects the structural strength of the base
1
. Furthermore, since the rotating center shaft of the rotary seat
3
is located at the outer side of the base plate
2
, and since it is farther away from the center of the base plate
2
, adjustment of the left and right inclination of the circular saw
5
is relatively troublesome. Therefore, improvement on conventional circular saws is necessary.
SUMMARY OF THE INVENTION
A primary object of the present invention is to provide an improved base structure of a circular frame. A preferred embodiment of the improved base structure of a circular saw includes a base, a rotatable base plate, a mounting seat, and a rotary seat. The base plate is mounted on the base. The base plate has a recess formed at a rear end of an upper face thereof in a suitable position. Two positioning bolts are screwably and symmetrically provided on both sides of the recess. The mounting seat is screwably secured above the recess by means of two bolts disposed on both sides of the recess. The mounting seat is a generally semi-circular structure that straddles the recess in said base plate, and has having a pivot portion at a bottom end thereof in the center. The pivot portion is located in the recess of the base plate and having a screw hole with a central axis aligning with a radial line of the rotatable base plate located on the upper face of said base plate. The rotary seat is mounted to the mounting seat. The rotary seat is rotatable relative to the mounting seat to permit adjustment of inclination angle thereof. The rotary seat is provided with a curved slide groove for slidable displacement of an adjusting bolt. The rotary seat has a pivot portion at a bottom end thereof in the center that corresponds to the pivot portion at the bottom end of the mounting seat. The pivot portion of the rotary seat has a pivot hole that corresponds to the hole of the pivot portion of the mounting seat. A pivot passes through the pivot portions of the mounting seat and the rotary seat to thereby pivotally and integrally mount the pivot portions in the recess of the base plate. The pivot has a central axis that is likewise aligned with the radial line located on the upper face of the base plate, whereby the rotary seat can utilize the pivot as center of rotation to perform adjustment of inclination angles relative to the upper face of the base plate.
REFERENCES:
patent: 4581966 (1986-04-01), Kaiser et al.
patent: 4774866 (1988-10-01), Dehari et al.
patent: 5347902 (1994-09-01), Brickner et al.
patent: 5473821 (1995-12-01), DiMarco
patent: 5623860 (1997-04-01), Schoene et al.
patent: 5651297 (1997-07-01), Garuglieri
patent: 5737986 (1998-04-01), Garuglieri
patent: 5896798 (1999-04-01), Garuglieri
patent: 5988031 (1999-11-01), Wixey
patent: B1 4934233 (1994-08-01), Brundage et al.
Connolly Bove & Lodge & Hutz LLP
Dexter Clark F.
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