Woodworking – Planer – Rotary cylindrical cutter
Reexamination Certificate
2000-10-05
2001-11-13
Bray, W. Donald (Department: 3725)
Woodworking
Planer
Rotary cylindrical cutter
C144S114100, C144S130000, C409S241000
Reexamination Certificate
active
06315015
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 a cutter locking device for locking a cutter unit when the cutter unit is at a non-operative state.
2. Description of the Related Art
Referring to
FIG. 1
, a conventional wood planing machine is shown to include an elongated machine base
10
, first and second pairs of posts
100
, a cutter carriage
11
, vertical first and second threaded rods (not visible), carriage fastening means, an elongated cutter unit
12
, and a cutter locking device
17
.
As illustrated, the machine base
10
has opposed first and second mounting sides spaced apart from each other in a longitudinal direction, and opposed feed-in and take-out sides spaced apart from each other in a transverse direction. The first and second pairs of posts
100
are fixed on the machine base
10
at the first and second mounting sides, respectively.
The cutter carriage
11
is disposed above the machine base
10
, and has first and second end portions
110
mounted respectively, vertically and movably on the first and second pairs of posts
100
for moving the cutter carriage
11
along the posts
100
, thereby adjusting height of the cutter carriage
11
relative to the machine base
10
.
The carriage fastening means fastens releasably the carriage
11
on the first and second pairs of posts
100
after adjusting the height of the carriage
11
relative to the machine base
10
.
The cutter unit
12
is disposed to extend in the longitudinal direction, and has first and second shaft portions
120
journalled to the first and second end portions
110
of the cutter carriage
11
.
The cutter locking device includes an inverted L-shaped locking member
17
mounted pivotally on an outer surface of the second end portion
110
of the cutter carriage
11
above the second shaft portion
120
via a pivot pin
171
, a pair of engagement grooves
121
formed in an outer surface of the second shaft portion
120
in a radial direction, and a biasing unit
18
which biases a first arm portion
172
of the locking member
17
to rotate about the pin
171
in a direction in such a manner that an engaging tongue
173
of a second arm portion
174
engages one of the engagement grooves
121
in the cutter unit
12
, thereby preventing rotation of the cutter unit
12
relative to the carriage
11
and disposing the cutter unit
12
at a locked position.
The cutter carriage
11
further includes a waste passage
15
formed in an outer surface of the second end portion
110
thereof at an elevation above the second shaft portion
120
, and a waste collection member
16
which is inserted removably into the waste passage
15
for guiding waste that results from operation of the cutter unit
12
and which presses the first arm portion
172
of the locking member
17
against biasing action of the biasing unit
18
, thereby removing the engaging tongue
173
from the engagement groove
121
and correspondingly permitting rotation of the cutter unit
12
relative to the cutter carriage
11
, and disposing the cutter unit
12
at an unlocked position.
One disadvantage that results from the use of the aforesaid conventional wood planing machine resides in that the locking member
17
is mounted pivotally on the carriage
11
, thereby affecting adversely the locking effect thereof.
SUMMARY OF THE INVENTION
Therefore, the object of this invention is to provide a wood planing machine which is provided with a cutter locking 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, first and second pairs of posts, a cutter carriage, carriage fastening means, an elongated cutter unit, and a cutter locking device. The machine base has a top surface, opposed first and second mounting sides spaced apart from each other in a longitudinal direction, and opposed feed-in and take-out long sides spaced apart from each other in a transverse direction. The first and second pairs of posts are fixed on the top surface of the machine base at the first and second mounting sides, respectively. The cutter carriage is disposed above the machine base, and has first and second end portions mounted respectively, vertically and movably on the first and second pairs of posts for moving the cutter carriage along the posts, thereby adjusting height of the cutter carriage relative to the machine base. The carriage fastening means fastens releasably the carriage on the first and second pairs of posts after adjusting the height of the carriage relative to the machine base. The cutter unit is disposed to extend in the longitudinal direction, and has first and second shaft portions journalled to the first and second end portions of the cutter carriage. The second shaft portion is formed with a first engagement section. The cutter locking device includes a locking plate and a biasing unit. The locking plate is mounted movably and vertically on an outer surface of the second end portion of the cutter carriage, and has a vertical plate portion disposed adjacent to the second shaft portion, and a horizontal plate portion which extends integrally, laterally and outwardly from a lower end of the vertical plate portion so as to be disposed below the second shaft portion and which is formed with a second engagement section. The biasing unit biases the locking plate to move upwardly on the outer surface of the second end portion of the cutter carriage to an upper position to engage the first and second engagement sections, thereby preventing rotation of the cutter unit relative to the carriage. The locking plate is movable forcibly against biasing action of the biasing unit to a lower position so as to disengage the first and second engagement sections from each other, thereby permitting rotation of the cutter unit relative to the carriage.
REFERENCES:
patent: 5675903 (1997-10-01), Cole
patent: 5794675 (1998-08-01), Garcia
Bray W. Donald
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
P & F Brother Industrial Corporation
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