Turning – Lathe
Reexamination Certificate
2002-03-04
2003-05-06
Bishop, Steven C. (Department: 3722)
Turning
Lathe
C082S142000, C082S143000, C142S001000, C474S040000, C474S086000, C474S088000
Reexamination Certificate
active
06557444
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a wood lathe, and more particularly to a wood lathe, which includes a stepless speed-adjusting unit that is operable to adjust the rotational speed of a workpiece.
2. Description of the Related Art
Referring to
FIGS. 1 and 2
, a conventional wood lathe
10
is shown to include a table
11
, a fixed seat
12
, a coupling rod
13
, a workpiece-holding unit
14
, a blade unit
15
, and a driving unit
16
. The table
11
has a first end
111
and a second end
112
. The fixed seat
12
includes a right housing
121
, a partition
122
, and a left housing
123
. The partition
122
is disposed between and is connected removably to the right and left housings
121
,
123
. The coupling rod
13
is disposed fixedly on the table
11
, and has a first end
131
that extends through a bushing
1212
on the right housing
121
of the fixed seat
12
, and a second end
132
. The workpiece-holding unit
14
includes an output shaft
141
that extends through a bearing
1211
on the right housing
121
, a left clamping element
142
that is bolted to the output shaft
141
, a sliding member
143
that is sleeved movably and that is locked releaseably on the second end
132
of the coupling rod
13
, and a right clamping element
144
that is mounted rotatably on the sliding member
143
. The left and right clamping elements
141
,
144
press respectively against two end surfaces
172
,
171
of an elongated wood workpiece
17
so as to clamp the workpiece
17
between the left and right clamping elements
141
,
144
, thereby permitting synchronous rotation of the workpiece
17
and the output shaft
141
. The driving device
16
includes a motor
161
that is disposed between the left housing
123
and the partition
122
, a stepped driving wheel
162
that is sleeved fixedly on a motor shaft of the motor
161
, a stepped driven wheel
163
that is sleeved fixedly on the output shaft
141
, and an endless driving belt
164
that is trained on the driving wheel
162
and the driven wheel
163
.
When it is desired to change the rotational speed of the output shaft
141
and the workpiece
17
, the left housing
123
is removed from the partition
122
and the right housing
121
so that the position of the belt
164
can be adjusted relative to the driving wheel
162
and the driven wheel
163
. Subsequently, the left housing
123
is mounted back onto the partition
122
and the right housing
121
. As such, it is time-consuming to adjust the rotational speed of the workpiece
17
. Furthermore, the lathe
10
cannot be used to rotate a second workpiece that is shaped as a ring plate.
SUMMARY OF THE INVENTION
An object of this invention is to provide a wood lathe, which includes a stepless speed-adjusting unit that can be adjusted with relative ease to change the rotational speed of a workpiece.
Another object of this invention is to provide a wood lathe, which can be used to rotate a workpiece that is shaped as a ring plate.
According to this invention, a wood lathe has a driving device, which includes a driving pulley unit disposed around a rotating inner rod, a driven pulley unit disposed around a first output shaft, a V-belt unit trained on the driving and driven pulley units, and a speed-adjusting unit. The first output shaft is used to rotate a first workpiece that is shaped as a straight rod. When a rotary knob is rotated, a movable inner half of the driven pulley unit moves toward or away from a fixed outer half of the driven pulley unit so that the V-belt unit moves a movable outer half of the driving pulley unit away from or toward a fixed inner half of the driving pulley unit. As such, the position of the V-belt unit can be adjusted relative to the driving and driven pulley units to change the rotational speed of the first output shaft.
Preferably, the lathe further has a workpiece-holding unit that includes:
a bearing tube member disposed fixedly on a table;
a second output shaft parallel to the first output shaft and having an externally threaded first end with a reduced outer diameter to define a shoulder, and a second end, the second output shaft being journalled within the bearing tube member and being adapted to extend through a second workpiece that is shaped as a ring plate;
a driving gear sleeved fixedly on the first output shaft;
a driven gear sleeved fixedly on the second end of the second output shaft;
a toothed endless belt trained on the driving and driven gears so as to transfer rotation of the first output shaft to the second output shaft; and
a nut engaging threadably the first end of the second output shaft so as to be adapted to lock the second workpiece between the nut and the shoulder of the second output shaft.
REFERENCES:
patent: 2024460 (1935-12-01), Lewellen et al.
patent: 2096431 (1937-10-01), Keller
patent: 2517608 (1950-08-01), Taylor
patent: 3410326 (1968-11-01), Paquin
patent: 3418863 (1968-12-01), Landau
patent: 3705517 (1972-12-01), Yamanaka et al.
patent: 5186088 (1993-02-01), Wixey
Bishop Steven C.
Knobbe Martens Olson & Bear LLP
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