Portable cutting apparatus

Details Portable cutting apparatus Portable cutting apparatus

1999-04-15

2001-11-13

Ashley, Boyer (Department: 3724)

Cutting

Tool carrier or guide affixed to work during cutting

C083S397000, C083S454000, C083S456000, C083S478000, C083S471200, C083S483000, C083S490000, C451S347000, C451S429000

Reexamination Certificate

active

06314853

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a cutting apparatus for cutting elongated objects, such as rails or pipes.
A prior art rail cutting apparatus is disclosed in Japanese unexamined patent publication No. 5-346003. As shown in
FIG. 12
, the rail cutting apparatus includes a catch frame
201
for fixing a rail
200
. A pair of slide shafts
202
extends from a rear end of the catch frame
201
. A block
203
is slidably supported by the slide shafts
202
. An arm
204
is tiltably supported by the block
203
. The arm
204
supports a rotatable blade
205
for cutting the rail
201
, a blade cover
206
and an engine
207
for driving the rotatable blade
205
.
As the arm
204
is tilted downward, the rotatable blade
205
moves toward and cuts the rail
200
. However, when the arm
204
is tilted downward, the blade cover
206
and the engine
207
also tilt along with the arm
204
. Therefore, if an obstacle is located on or near the rail
200
, the blade cover
206
and/or the engine
207
may contact the obstacle and disturb the cutting operation. Furthermore, when the engine
207
is tilted, the oil level of the engine
207
is changed, and the float of the engine's carburetor is moved, so the performance of the engine
207
is affected, and the risk of engine trouble is increased.
SUMMARY OF THE INVENTION
An objective of the present invention is to provide a cutting apparatus that has an improved structure for supporting a blade cover and an engine.
For achieving the objective of the present invention, a cutting apparatus for cutting an elongated workpiece includes a rotatable blade for cutting the rail, a blade cover for covering the blade, a driver for driving the blade, and a frame for supporting the blade, the blade cover and the driver. The cutting apparatus further includes at least one of a first link mechanism and a second link mechanism. The first link mechanism supports the blade and the blade cover relative to the frame and permits the blade cover to move while maintaining substantially the same attitude during cutting. The second link mechanism moves the driver while the driver maintains a substantially constant attitude.
Other aspects and advantages of the present invention will become apparent from the following description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the invention.


REFERENCES:
patent: 1095399 (1914-05-01), Huntington
patent: 2512419 (1950-06-01), Dergance
patent: 3834369 (1974-09-01), Haase
patent: 4249443 (1981-02-01), Jagers
patent: 4318324 (1982-03-01), Hall et al.
patent: 4335637 (1982-06-01), Kaltenbach
patent: 4531440 (1985-07-01), Lucky
patent: 5146825 (1992-09-01), Dehari
patent: 5438899 (1995-08-01), Hoyer-Ellefsen
patent: 5486136 (1996-01-01), Noda
patent: 0780181 A1 (1997-06-01), None
patent: 5-346003 (1993-12-01), None

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