Woodworking – Work guide – Work urged laterally
Reexamination Certificate
2002-02-04
2002-11-12
Bray, W. Donald (Department: 3725)
Woodworking
Work guide
Work urged laterally
C144S253500
Reexamination Certificate
active
06478060
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
This application claims priority of Taiwanese Application No. 90221093, filed on Dec. 4, 2001.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a wood planing machine, and more particularly to a wood planing machine, which includes an angle-adjusting device that can adjust the angle of a workpiece-guiding plate with respect to a machine bed.
2. Description of the Related Art
Referring to
FIGS. 1
,
2
,
3
, and
4
, a conventional wood planing machine
10
is shown to include a machine frame
11
, a support member
12
, an elongated cutter
13
, a machine bed consisting of a right half
14
and a left half
15
, and a workpiece-guiding plate
16
. The support member
12
is disposed on a top surface of the machine frame
11
. The cutter
13
is journalled on the support member
12
between the right and left halves
14
,
15
, and is rotatable by a driving source (not shown). The plate
16
is disposed on the right and left halves
14
,
15
of the machine bed. A workpiece (not shown), which abuts against the plate
16
, can be pushed along the latter on the machine bed from the right half
14
to the left half
15
, and vice versa, so as to be cut by the cutter
13
. An angle-adjusting device
20
is disposed to adjust the angle of the plate
16
with respect to the machine bed, and includes a fixed base
21
, a movable seat
22
, a rotatable member
23
, a bearing member
24
, a first control unit
25
, a second control unit
26
, and a guiding rail
27
that is bolted onto a horizontal top wall of the base
21
and that extends in a transverse direction of the machine bed. The base
21
is bolted onto a rear side wall
151
of the left half
15
. The seat
22
has a bottom surface, which is formed with a slide slot
2221
that engages the guiding rail
27
so as to permit movement of the seat
22
on the base
21
in the transverse direction of the machine bed. The rotatable member
23
is bolted onto a rear surface of the plate
16
. The bearing member
24
is unitary, and has a vertical rib
241
that is received slidably within an open-ended vertical slot
2211
in a vertical wall
221
of the seat
22
, and a curved concave portion
242
that engages fittingly a curved convex portion
231
of the rotatable member
23
. The second control unit
26
includes a locking element
261
, a guide rod
262
that is journalled within a hole
2222
in a horizontal plate
222
of the seat
22
, a nut
263
, and a rotary lever
264
that is connected fixedly to the guide rod
262
. The guide rod
262
extends through a vertical slot
2212
in the vertical wall
221
of the seat
22
, a hole
243
in the bearing member
24
, and a slide slot
232
in the convex portion
231
of the rotatable member
23
, and has a threaded end that engages a threaded hole (not shown) in the locking element
261
. The locking element
261
has a portion that is received movably within the slide slot
232
so as to prevent rotation of the locking element
261
on the guide rod
262
. As such, the rotatable member
23
and the bearing member
24
are retained on the guide rod
262
, and are confined between the locking element
261
and the nut
263
. The rotary lever
264
is rotatable to move the locking element
261
on the guide rod
262
between a locking position, where the locking element
261
presses the rotatable member
23
and the bearing member
24
against the nut
263
so as to lock the rotatable member
23
on the bearing member
24
, and a release position, where the rotatable member
23
and the bearing member
24
are unlocked from the locking element
261
so that the rotatable member
23
can rotate relative to the bearing member
24
for angle adjustment of the plate
16
. The first control unit
25
includes a rotating shaft
251
with an eccentric pin
2511
, a vertical bolt
252
, a nut
253
, and a rotary lever
254
. The rotating shaft
251
is journalled within the seat
22
. The eccentric pin
2511
extends into a hole
2521
in a head of the bolt
252
so as to move the bolt
252
vertically relative to the base
21
. The bolt
252
extends through a guide slot
212
in a horizontal top wall
211
of the base
21
, which extends in the transverse direction of the machine bed. The nut
253
is disposed under the top wall
211
of the base
21
, and engages the bolt
252
. The rotary lever
254
is connected fixedly to the rotating shaft
251
, and is rotatable to move the bolt
252
between a locking position shown in Fig.
4
, where the nut
253
presses against the top wall
211
so as to lock the seat
22
on the base
21
, and a release position, where the nut
253
is spaced apart from the top wall
211
so as to release the seat
22
from the base
21
, thereby permitting position adjustment of the plate
16
.
The aforesaid conventional wood planing machine
10
suffers from the following disadvantages:
(1) Because the clamping force of the locking element
261
and the nut
263
acting on the rotatable member
23
and the bearing member
24
is relatively small, the plate
16
cannot be fixed effectively on the machine bed during operation.
(2) Because the plate
16
is supported directly by only one element, i.e. the rotatable member
23
, the former sways easily about the latter during operation.
(3) To adjust accurately the angle of the plate
16
with respect to the machine bed, there is a need for a relatively high manufacturing precision of the convex portion
231
of the rotatable member
23
and the concave portion
241
of the bearing member
24
.
(4) The seat
22
is guided to move on the base
21
in the transverse direction of the machine bed by engagement of the guiding rail
27
and the slide slot
2221
in the seat
22
, thereby hindering smooth movement of the seat
22
and the plate
16
.
SUMMARY OF THE INVENTION
An object of this invention is to provide a wood planing machine, which includes a workpiece-guiding plate that can be fixed effectively relative to a machine bed during operation.
Another object of this invention is to provide a wood planing machine, which does not require a high manufacturing precision of a device for supporting rotatably a workpiece-guiding plate.
Still another object of this invention is to provide a wood planing machine, which includes a movable seat that can move smoothly on a fixed base.
According to this invention, a wood planing machine includes a workpiece-guiding plate disposed on a machine bed, a base disposed fixedly on the bed, and a seat disposed movably on the base. Two fixing blocks are disposed fixedly on two opposite sides of the seat. Two coupling blocks are disposed fixedly on the plate. Two links are connected pivotally to the fixing blocks and the coupling blocks so as to permit rotation of the coupling blocks relative to the fixing blocks such that the angle of the plate can be adjusted with respect to the bed. A control rod assembly extends through the first and second links, and is rotatable to move the first and second links toward each other so as to clamp the fixing blocks and the coupling blocks, thereby locking the plate on the bed. Because the plate is connected to the seat by the links, which are disposed on the two sides of the seat, the plate can be fixed effectively relative to the seat. Furthermore, the plate can be prevented by the links from swaying about the seat during operation. In addition, there is no need for a high manufacturing precision for the links, the fixing blocks, and the coupling blocks.
Preferably, the seat is generally inverted U-shaped, and has a horizontal top wall and a pair of first and second side walls that extend integrally and downwardly from two opposite sides of the top wall and that define a dovetail groove therebetween under the top wall. The base has a fixed dovetail rib that is inserted into the dovetail groove and that presses against the first side wall, and a movable dovetail member that is inserted into the dovetail groove and that is movable between a locking position, where the d
Bray W. Donald
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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