Woodworking – Planer – Rotary cylindrical cutter
Reexamination Certificate
2000-09-18
2001-10-09
Bray, W. Donald (Department: 3725)
Woodworking
Planer
Rotary cylindrical cutter
C144S114100, C144S130000, C254S13300A, C254S414000
Reexamination Certificate
active
06298887
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a wood planing machine, more particularly to a wood planing machine provided with an automatic chain tensioner device.
2. Description of the Related Art
Referring to
FIGS. 1 and 2
, a conventional wood planing machine
10
is shown to include an elongated machine base
14
, left and right pairs of posts
16
, a cutter carriage
12
, vertical left and right threaded rods
11
, two sprockets
111
, an endless transmission chain
13
, and a chain tensioner device.
As illustrated, the machine base
14
has opposed left and right mounting short sides
140
, and opposed feed-in and take-out long sides
141
. The left and right pairs of posts
16
are fixed on the machine base
14
at the left and right mounting short sides
141
, respectively. The cutter carriage
12
is disposed above the machine base
14
, and has opposite end portions mounted respectively, vertically and movably on the left and right pairs of posts
16
. The threaded rods
11
are mounted respectively and rotatably on the left and right mounting short sides
140
of the machine base
14
such that the threaded rods
11
are disposed respectively between the left and right pairs of posts
16
, and extend threadedly through the opposite end portions of the cutter carriage
12
. The sprockets
111
are disposed below the machine base
14
and are sleeved respectively and fixedly on lower end portions of the left and right threaded rods
11
. The chain
13
is disposed below the machine base
14
and engages the sprockets
111
so as to rotate the left and right threaded rods
11
synchronously for moving the cutter carriage
12
along the posts
16
when the threaded rods
11
rotate on the machine base, thereby adjusting the height of the carriage
12
relative to the machine base
14
. The chain
13
has front and rear chain sections
131
,
132
disposed respectively adjacent to the feed-in and take-out long sides
141
of the machine base
14
.
The chain tensioner device includes an elongated horizontal rod
15
disposed below and pivoted to the machine base
14
by means of a pivot bolt
152
in such a manner that the rod
15
is located between the front and rear chain sections of the chain
13
, and a pair of gears
151
which are mounted respectively and rotatably on two opposite end portions of the rod
15
and which engage respectively the front and rear chain sections
131
,
132
under tension when one of the threaded rods
11
is rotated.
One disadvantage that results from the use of the aforesaid conventional wood planing machine resides in that, in order to provide the tensioning effect, the rod
15
is locked on the machine base
14
by the pivot bolt
152
, which may loosen due to long term use, thereby adversely affecting the chain tensioning ability.
SUMMARY OF THE INVENTION
Therefore, the object of this invention is to provide a wood planing machine which is provided with an automatic chain tensioner device which is clear of the aforementioned drawback that results from the use of the conventional wood planing machine.
Accordingly, the wood planing machine of the present invention includes an elongated machine base, left and right pairs of posts, a cutter carriage, vertical left and right threaded rods, two sprockets, an endless transmission chain, and a chain tensioner device. The machine base has a top surface, opposed left and right mounting short sides, and opposed feed-in and take-out long sides. The feed-in long side is disposed in front of the take-out long side. The left and right pairs of posts are fixed on the top surface of the machine base at the left and right mounting short sides, respectively. The cutter carriage is disposed above the machine base, and has opposite end portions mounted respectively, vertically and movably on the left and right pairs of posts. The left and right threaded rods are mounted respectively and rotatably on the left and right mounting short sides of the machine base such that the threaded rods are disposed respectively between the left and right pairs of posts, and extend threadedly through the opposite end portions of the cutter carriage for moving the cutter carriage along the posts when the threaded rods rotate on the machine base, thereby adjusting the height of the cutter carriage relative to the machine base. The sprockets are sleeved respectively and fixedly on the left and right threaded rods. The transmission chain engages the sprockets so as to rotate the left and right threaded rods synchronously with each other. The chain has a front chain section that is disposed adjacent to the feed-in long side of the machine base, and a rear chain section that is disposed adjacent to the take-out long side of the machine base. The chain tensioner device includes a movable pushing piece and a guiding unit. The pushing piece is disposed movably inside the chain. The guiding unit guides the pushing piece to move horizontally between the front and rear chain sections of the chain. A biasing unit biases the pushing piece to contact and move the front chain section away from the rear chain section, thereby tensioning the chain.
REFERENCES:
patent: 2642902 (1953-06-01), Carey
patent: 4456042 (1984-06-01), Clark et al.
Baker & Botts L.L.P.
Bray W. Donald
P & F Brother Industrial Corporation
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