Cutting – By endless band or chain knife – With means to guard the tension
Reexamination Certificate
2001-07-09
2003-07-22
Sewell, Paul T. (Department: 3711)
Cutting
By endless band or chain knife
With means to guard the tension
C083S100000, C083S397000
Reexamination Certificate
active
06595097
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to a band sawing machine, and more particularly to a band saw shielding device of the band sawing machine.
BACKGROUND OF THE INVENTION
The conventional band sawing machine is generally operated in a constant space such that the band saw is exposed for a predetermined length to facilitate the controlling of elevation of the elevation guide set of the band saw, so as to cut materials various in thickness.
As the thicker material is cut, the exposed portion of the band saw is longer and is in the state of operation. As a result, a machine operator is vulnerable to injuries.
Certain conventional machines are provided with a protective device for shielding the band saw. In the process that the device is raised, one side of the top of the device comes in contact with the outer periphery of the wheel, thereby resulting in limitation of the elevation range of the device. As a result, the sawing height or thickness is substantially reduced to call for the elevation adjustment of the band saw. Such an elevation adjustment of the band saw is often a source of inconvenience to the machine operator.
SUMMARY OF THE INVENTION
It is the primary objective of the present invention to provide a band sawing machine with a band saw shielding device capable of protecting the machine operator against injuries caused by the band saw in operation.
It is another objective of the present invention to provide a band sawing machine with a band saw shielding device which is designed to cooperate with the machine platform elevation device, thereby simplifying the structure of the band saw shielding device and enabling the band saw shielding device to operate with precision.
The device of the present invention is mounted in conjunction with an elevation guiding set of a band sawing machine. The band sawing machine comprises a wheel with its outer periphery being used to run the band saw for actuating the wheel; a stop portion located on the band sawing machine such that the stop portion is corresponding to a predetermined position of the wheel. The shielding device of the present invention comprises a main housing of a hollow construction and having a front plate which is provided with a hollowed portion, a position confining portion disposed longitudinally thereon to form a band replacing slot for passing the band saw, a receiving space formed in the center thereof for receiving the band saw, and a fixation portion for fixing the elevation guiding set; a movable cover having a slide plate capable of controllably cooperating with the position confining portion of the main housing, a stop edge disposed on the top of the slide plate such that the stop edge is stopped by the stop portion of the band sawing machine.
The shielding device cooperates with the elevation guiding set to surround the band saw to prevent the machine operator from being wounded by the band saw. The movable cover is not elevated along with the elevated main housing. As a result, the wheel is disposed in the hollowed portion of the main housing without being interfered, thereby enabling the elevation guiding set to be elevated higher to facilitate the sawing of a thicker material.
The main housing is provided in two sides of the position confining portion thereof with a slide slot.
REFERENCES:
patent: 2371731 (1945-03-01), Boice
patent: 3848502 (1974-11-01), O'Neill
patent: 3888148 (1975-06-01), Weissman
patent: 3939749 (1976-02-01), Muller et al.
patent: 3974724 (1976-08-01), Shadle
patent: 4204444 (1980-05-01), Kohr
patent: 4882962 (1989-11-01), Terpstra et al.
Duong Tom P
OAV Equipment & Tools, Inc.
Sewell Paul T.
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