Tools – Wrench – screwdriver – or driver therefor – Machine
Reexamination Certificate
2000-09-26
2001-10-09
Meislin, D. S. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Machine
Reexamination Certificate
active
06298753
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a ratchet wrench.
2. Background of the Invention
According to a conventional ratchet wrench, power generated by an air motor (i.e., a motor driven by compressed air) is transmitted to a ratchet mechanism via a reduction gear mechanism, to thereby rotate a tightening member connected to the ratchet mechanism.
When the tightening torque of such a conventional ratchet wrench is to be increased, the following two methods have been employed:
a) increasing the longitudinal size of the air motor; and
b) increasing the outer diameter of the rotor of the air motor.
However, method a) has a drawback in that, even when the motor output is increased by increasing the longitudinal size of the air motor, the tightening torque does not necessarily increase. Method b) has a drawback in that there is a limit to how much the outer diameter of the rotor can be increased; that is, since the motor housing serves as a grip of the ratchet wrench and the grip cannot be made extremely large in diameter, the outer diameter of the rotor of the air motor cannot be enlarged very much.
SUMMARY OF THE INVENTION
In consideration of the above-described problem of the conventional art, an object of the present invention is to provide a ratchet wrench whose tightening torque can be increased without any change in size of the air motor.
The present invention provides a ratchet wrench comprising an air motor; a ratchet mechanism which receives power generated by the air motor via a reduction gear mechanism; a rotary tightening member connected to the ratchet mechanism so as to be rotated by the ratchet mechanism; and a flywheel fitted onto a shaft of the air motor.
Preferably, a tip end of the shaft of the air motor is in engagement with the reduction gear mechanism, and the flywheel is disposed between the rotor of the air motor and the reduction gear mechanism.
REFERENCES:
patent: 5142952 (1992-09-01), Putney et al.
patent: 5155952 (1992-10-01), Hansson
patent: 5158421 (1992-10-01), Simonin
Jordan and Hamburg LLP
Kabushiki Kaisha Shinano Seisakusho
Meislin D. S.
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