Woodworking – Planer – Adjustable cutter
Reexamination Certificate
2002-09-27
2003-12-02
Bray, W. Donald (Department: 3725)
Woodworking
Planer
Adjustable cutter
C074S02200R, C074S027000, C144S117100
Reexamination Certificate
active
06655427
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
This application claims priority of Taiwanese Application No. 091211330, filed on Jul. 24, 2002.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a wood planing machine, more particularly to a wood planing machine with an error reducing unit for a workpiece thickness to be removed.
2. Description of the Related Art
Referring to
FIGS. 1
to
3
, a conventional wood planing machine
10
is shown to include a base
11
having left and right sides, left and right pairs of posts
12
extending uprightly from the left and right sides of the base
11
, a cutter carriage
13
having left and right carriage ends
131
mounted slidably and respectively on the left and right pairs of posts
12
, and left and right screw rods
16
mounted rotatably on the left and right sides of the base
11
. Tubular left and right threaded members
15
extend through two through holes in the left and right carriage ends
131
. The left and right screw rods
16
extend through and threadedly engage the threaded members
15
, respectively. Left and right fastening nuts
19
threadedly and respectively engage the threaded members
15
so as to secure the threaded members
15
on the cutter carriage
13
. A transmission unit
18
includes two sprockets
181
fixed to lower ends of the left and right screw rods
16
, and a transmission chain
182
trained on the sprockets
181
so as to permit synchronous rotation of the left and right screw rods
16
, which, in turn, results in vertical movement of the cutter carriage
13
relative to the base
11
. A handle
17
is mounted on a top end of the right screw rod
16
to facilitate turning of the left and right screw rods
16
.
Referring to
FIG. 4
, the cutter carriage
13
is parallel to the base
20
, and the threads
150
of the threaded members
15
rest on the threads
160
of the screw rods
16
due to the weight of the cutter carriage
13
. Thus, clearances
161
are formed between the threads
150
of the threaded member
15
and the threads
160
of the screw rods
16
. As such, the threaded members
15
and the carriage
13
can move relative to the screw rods
16
, thereby resulting in an increase in error for workpiece thickness that is to be removed.
SUMMARY OF THE INVENTION
Therefore, the object of this invention is to provide a wood planing machine with an error reducing unit that can prevent movement of a cutter carriage relative to a set of upright screw rods.
Accordingly, a wood planing machine of the present invention includes: a base having four corners; four hollow posts extending uprightly from the corners of the base, respectively, each of the posts being formed with an axial slot for access to an interior thereof; four screw rods extending rotatably and uprightly from the corners of the base through the posts, respectively, each of the screw rods having an externally threaded portion that is formed with an external thread; a cutter carriage having four corners mounted respectively, vertically and slidably on the posts, and a horizontal bottom surface; a transmission unit connected to the screw rods to permit synchronous rotation of the screw rods; and an error reducing unit including four tubular threaded members that are secured respectively to the four corners of the carriage, that are disposed respectively within the posts in such a manner that the threaded members are exposed from the axial slots in the posts, and that define axially extending threaded bores respectively engaging the screw rods such that rotation of the screw rods results in movement of the carriage along the posts. Each of the threaded members has an internally threaded portion defining a respective one of the axially extending threaded bores and engaging the externally threaded portion of the respective one of the screw rods
50
, and a circumferential slot formed through a wall of the internally threaded portion so as to divide the internally threaded portion into an upper part and a lower part. The upper part is disposed above the circumferential slot, and has a bottom surface that defines a top end of the circumferential slot. The lower part is disposed below the circumferential slot, and is formed with a vertically extending threaded bore therethrough. Each of the upper and lower parts is formed with an internal thread that engages the external thread of the respective one of the screw rods. The error reducing unit further includes four locking bolts that engage respectively the vertically extending threaded bores in the threaded members and that press against the bottom surfaces of the upper parts of the internally threaded portions of the threaded members such that the internal threads of the upper parts of the threaded members press upwardly against the external threads of the screw rods and such that the internal threads of the lower parts of the threaded members press downwardly against the external threads of the screw rods so as to lock the internally threaded portions of the threaded members on the externally threaded portions of the screw rods.
REFERENCES:
patent: 5967205 (1999-10-01), Welsh et al.
patent: 6089286 (2000-07-01), Liao
patent: 6315015 (2001-11-01), Chang
patent: 6415829 (2002-07-01), Chiang
patent: 6427734 (2002-08-01), Chiang
patent: 6546975 (2003-04-01), Liao et al.
Atkin, Gump, Strauss, Hauer & Feld, L.L.P.
Bray W. Donald
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