Cutting – Rotatable disc tool pair or tool and carrier – With means to support work relative to tool
Reexamination Certificate
1999-09-30
2001-02-20
Bray, W. Donald (Department: 3725)
Cutting
Rotatable disc tool pair or tool and carrier
With means to support work relative to tool
C083S435140, C108S143000, C144S286500, C144S287000
Reexamination Certificate
active
06189429
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a table saw, more particularly to a workpiece supporting assembly for a table saw, which has two rows of rollers that guide two rails to move smoothly relative to a worktable.
2. Description of the Related Art
Referring to
FIG. 1
, a conventional table saw is shown to include a base
1
, a worktable
10
that is fixed on the base
1
, and two movable rails
11
,
12
that are disposed respectively on two opposite vertical side walls of the worktable
10
. A saw member
2
extends upward from the worktable
10
. A horizontal workpiece positioning strip
3
rides on the rails
11
,
12
for abutment of a workpiece to be cut. A horizontal extension support plate
4
rides on the right end portions of the rails
11
,
12
, and can move with the latter to abut against the right edge of the worktable
10
. The worktable
10
and the extension support plate
4
constitute a workpiece supporting assembly for supporting the workpiece thereon.
Referring to
FIG. 2
, each of the vertical side walls of the worktable
10
is formed integrally with a horizontal row of positioning members
13
(only one is shown). Each of the positioning members
13
has a threaded hole
131
, within which a locking member
14
is provided. Each of the locking members
14
includes an externally threaded rod
140
extending through the threaded hole
131
in the corresponding positioning member
13
, a rectangular plate
141
fixed to one end of the threaded rod
140
, and a lock nut
142
sleeved on the other end of the threaded rod
140
. As illustrated, the plate
141
is received slidably within an open-ended horizontal dovetail groove
111
in the rail
11
. In a situation where the nut
142
is loosened, the rail
11
can move on the plate
141
. When the nut
142
is tightened, the rail
11
is locked on the worktable
10
. The rail
12
(see
FIG. 1
) has a structure that is the same as that of the rail
11
, and is locked on the worktable
10
in the same manner as the rail
11
. Because the plates
142
are rectangular, it is difficult to move the rails
12
(see
FIG. 1
) smoothly on the plates
142
.
SUMMARY OF THE INVENTION
The object of this invention is to provide a table saw with an improved workpiece supporting assembly, which has rollers for guiding two rails to move smoothly relative to a worktable.
According to this invention, a workpiece supporting assembly for a table saw includes a worktable and two horizontal rows of rollers disposed respectively and rotatably on two vertical side walls of the worktable. Two movable rails are disposed respectively on the side walls of the worktable. Each of the rails has an open-ended horizontal dovetail groove that extends along the length thereof and that confines the rollers of a corresponding one of the rows therein. A horizontal extension support plate rides on the rails. Accordingly, the rails and the extension support plate can move smoothly relative to the worktable.
Preferably, the worktable is provided with two fixed stop elements. Each of the rails is provided with a fixed element that is limited to move between the stop elements, thereby retaining the rails on the worktable.
REFERENCES:
patent: 2937765 (1960-05-01), Swanic
patent: 4161974 (1979-07-01), Patterson
patent: 4601226 (1986-07-01), McClintock
patent: 5201863 (1993-04-01), Peot
patent: 5379816 (1995-01-01), Charlton
patent: 5979523 (1999-11-01), Puzio et al.
Bray W. Donald
P&F Brother Industrial Corporation
Smith , Gambrell & Russell, LLP
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