Wood turning – Circular section – Cutter
Reexamination Certificate
2001-12-07
2003-11-04
Bishop, Steven C. (Department: 3722)
Wood turning
Circular section
Cutter
C082S011100, C082S132000, C082S137000, C142S055000
Reexamination Certificate
active
06640849
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
This application claims priority of Taiwanese Application No. 90217523, filed on Oct. 15, 2001.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a wood lathe, and more particularly to a wood lathe including a tracing unit, by which a groove pattern on a sample bar is traced mechanically and is duplicated on a bar blank.
2. Description of the Related Art
Referring to
FIGS. 1
,
2
and
3
, a conventional wood lathe
10
is shown to include a lathe bed
11
, a blank-holding unit
12
, a sample-holding unit
13
, a moving unit
14
, a blade unit
15
, a tracing unit
16
, and a tension spring
17
. The blank-holding unit
12
consists of a headstock
121
and a tailstock
122
, which are provided with a pair of clamping elements
1211
,
1221
that clamp and fix a wood bar blank (not shown) therebetween. An output shaft (not shown) is journalled to the headstock
121
, and is connected fixedly to the clamping element
1211
so as to rotate the bar blank (not shown) when the output shaft rotates. The sample-holding unit
13
includes two bases
131
that are disposed slidably on and that are locked releaseably on the lathe bed
11
, two support frames
132
that are inserted respectively into two hollow posts
1311
of the bases
131
, two height-adjustable movable members
133
that are sleeved respectively on the support frames
132
, two horizontal mounting rods
134
that are connected fixedly to the movable members
133
, and two clamping elements
135
that are connected respectively and fixedly to the connecting rods
134
and that clamp and fix a sample bar (not shown) therebetween.
The moving unit
14
includes a track unit
141
that is connected fixedly to top ends of the support frames
132
, and an interior sliding block
142
that is disposed longitudinally and movably within the track unit
141
. A generally U-shaped exterior sliding seat
143
is disposed movably on an outer surface of the track unit
141
. A bottom sliding member
144
is connected fixedly to the interior sliding block
142
and the exterior sliding seat
143
, and is disposed movably on a bottom portion of the track unit
141
. A bottom cover
145
is disposed to close a bottom opening
1441
in the bottom sliding member
144
. A handle
146
is fixed to a horizontal top plate portion
1431
(see
FIG. 3
) of the exterior sliding seat
143
.
The blade unit
15
includes a blade-mounting rod
151
, and a blade
152
that is mounted fixedly to the blade-mounting rod
151
and that is inserted between the bottom sliding member
144
and the bottom cover
145
. The tracing unit
16
includes a vertical connecting rod
161
that is connected fixedly to the blade-mounting rod
151
, an annular adjustment element
162
that is sleeved movably on and that is locked releaseably on the connecting rod
161
, and a follower roller
163
that is mounted rotatably on the adjustment element
162
and that is biased by the spring
17
to press against a lateral side of the sample bar (not shown). When the handle
146
is moved along the track unit
141
, the follower roller
163
slides over the lateral side of the sample bar (not shown) along a curved path so that the blade
152
moves synchronously with the follower roller
163
. Accordingly, a groove pattern on the sample bar (not shown) is traced mechanically, and is duplicated on the bar blank (not shown). The aforesaid conventional wood lathe
10
suffers from a drawback in that no effective guiding and stabilizing means are provided for the exterior sliding seat
143
, thereby resulting in vibration of the blade unit
15
when the follower roller
163
slides on the sample bar (not shown). As such, the blade
152
cannot move smoothly during operation.
SUMMARY OF THE INVENTION
The object of this invention is to provide a wood lathe, which includes a tracing unit and a blade that can move smoothly during operation.
According to this invention, a wood lathe includes an axial moving unit with a movable seat, which is sleeved movably on a driving rod and a guide rod that are parallel to each other. A driving gear is disposed rotatably on the movable seat, and engages a gear-engaging member of the driving rod. When an actuator member is rotated, the gear rotates synchronously therewith so as to move the movable seat on the driving rod. A sample bar and a bar blank are held on a bed of the lathe. A blade is carried on the movable seat for cutting the bar blank. A tracing unit is disposed on the movable seat so that a groove pattern on the sample bar is traced mechanically and is duplicated on the bar blank. Because the movable seat is moved on the driving rod by rotating the actuator member, the movements of the movable seat and the blade are stabilized. Furthermore, the movable seat is guided effectively to move smoothly in a direction by means of the guide rod.
REFERENCES:
patent: 1484286 (1924-02-01), Alber
patent: 2769466 (1956-11-01), Brauneis
patent: 2919727 (1960-01-01), Brewer, Jr.
patent: 3204671 (1965-09-01), Schoenrock
patent: 3332458 (1967-07-01), Baldwin
patent: 3405745 (1968-10-01), Schoonover et al.
patent: 4608889 (1986-09-01), Kollar
patent: 5063799 (1991-11-01), Brewer
patent: 5884680 (1999-03-01), Kuo
patent: 275775 (1988-07-01), None
Bishop Steven C.
Webb Ziesenheim & Logsdon Orkin & Hanson, P.C.
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