Cutting – Rotatable disc tool pair or tool and carrier – With means to support work relative to tool
Reexamination Certificate
2000-01-28
2001-09-04
Rada, Rinaldi I. (Department: 3724)
Cutting
Rotatable disc tool pair or tool and carrier
With means to support work relative to tool
C083S477200
Reexamination Certificate
active
06283002
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a table saw apparatus, more particularly to a table saw apparatus having a saw blade which is movable upward and downward and which is inclinable.
2. Description of the Related Art
FIGS. 1 and 2
illustrate a conventional table saw apparatus
10
for wood sawing. The table saw apparatus
10
includes a top plate
111
having a slot
112
for receiving movably therein a saw blade
12
, opposite front and rear walls
11
,
13
extending downwardly from the top plate
111
, a motor
28
disposed underneath the top plate
111
and having a shaft connected to the saw blade
12
, and a height adjusting unit
20
disposed underneath the top plate
111
and connected to the saw blade
12
for moving the saw blade
12
upward and downward.
The height adjusting unit
20
includes an elongated support rod
21
secured to a bottom side of the top plate
111
via locking means
211
, a connecting seat
22
which has two opposite upper lugs
221
sleeved on the support rod
21
and two opposite lower lugs
222
opposite to the upper lugs
221
, a positioning seat
23
secured to a bottom side of the connecting seat
22
, a motor seat
24
which has a base plate
243
connected securely to the motor
28
and two opposite side plates
241
projecting from two opposite sides of the base plate
241
and mounted pivotally on the lower lugs
222
via a pivot pin
27
passing through top ends of the side plates
241
, a driving suspension block
25
which has two opposite thickness-reduced ends
252
inserted respectively into two opposite slots
242
that are formed respectively in bottom sides of the opposite side plates
241
of the motor seat
24
, and a rotary drive member
26
which has a threaded section
261
engaging threadedly an inner thread
253
of the driving suspension block
25
and a handle
29
opposite to the threaded section
261
.
When in operation, the motor seat
24
is turned upward and rearward toward the rear wall
11
to lift the saw blade
12
to pass through the slot
112
via the driving suspension block
25
which is moved in a direction from the front wall
13
toward the rear wall
11
by rotating the rotary drive member
26
. The saw blade
12
can be tilted at an angle relative to the top plate
111
via the connecting seat
22
, the positioning seat
23
, and the motor seat
24
which are turned about the support rod
21
by moving sidewise the rotary drive member
26
.
The above described table saw apparatus
10
has disadvantages in that the motor
28
is suspended from the top plate
111
via the motor seat
24
and the connecting seat
22
which is mounted pivotally on the support rod
21
. As a result, such suspension is insecure, and can cause significant vibration on the table saw apparatus
10
when in use. Moreover, it is burdensome to tilt the saw blade
12
by pushing the rotary drive member
26
to turn the connecting seat
22
, the motor seat
24
, the driving suspension block
25
, and the motor
28
about the support rod
21
.
SUMMARY OF THE INVENTION
Therefore, it is an object of the present invention to provide a table saw apparatus that is capable of overcoming the aforementioned problems.
Accordingly, a table saw apparatus of this invention comprises: a table having left and right sides, front and rear walls, and a top plate on top of the front and rear walls, the top plate having a slot extending in a direction from the front wall toward the rear wall; a movable saw blade disposed movably underneath the top plate and extendable into the slot, the saw blade having a first shaft which extends sidewise therefrom relative to the table; a motor disposed underneath the top plate and having a second shaft which extends sidewise therefrom relative to the table; a belt-pulley mechanism interconnecting the first and second shafts for synchronizing rotations of the first and second shafts; a bracket mounted pivotally on the table between the front and rear walls so as to be turnable downward and forward, and upward and rearward, the bracket holding rigidly the motor; a saw frame mounted pivotally on the table between the front and rear walls for turning forward or rearward, the saw frame being disposed above the motor and including a tubular seat which is movable downward when the saw frame turns forward and which is movable upward when the saw frame turns rearward, the tubular seat holding rotatably the first shaft thereinside; a connecting unit interconnecting the tubular seat and the motor so that the motor is moved along with the tubular seat; and a height adjustment unit mounted on one of the front and rear walls and including a first rotary drive member extending in a direction parallel to a line extending from the front wall to the rear wall, the first rotary drive member being connected drivingly to the saw frame so as to move the saw frame forward or rearward.
REFERENCES:
patent: 1783041 (1930-11-01), Hirst
patent: 2008673 (1935-07-01), Ocenasek
patent: 2844173 (1958-07-01), Gaskell
patent: 3011529 (1961-12-01), Copp
patent: 4184394 (1980-01-01), Gjerde
patent: 4599927 (1986-07-01), Eccardt et al.
patent: 5875698 (1999-03-01), Ceroll et al.
patent: 5943932 (1999-08-01), Sberveglieri
patent: 6076445 (2000-06-01), Kenyon et al.
patent: 1220872 (1960-01-01), None
patent: 506022 (1953-01-01), None
Baker & Botts L.L.P.
Flores Sanchez Omar
Rada Rinaldi I.
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