Tool driving or impacting – Impacting devices – With anvil arranged to transmit torsional impact to tool
Reexamination Certificate
2000-11-28
2001-09-04
Smith, Scott A. (Department: 3721)
Tool driving or impacting
Impacting devices
With anvil arranged to transmit torsional impact to tool
C173S093000, C173S176000
Reexamination Certificate
active
06283226
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to a power wrench, more particularly, it relates to a clutch-buffer assembly for power wrench in a low-cost simple structure to be operated easily with high efficiency and low power consumption.
2. Description of the Prior Art
In a conventional clutch device for power wrench, such as a disclosed Taiwan patent No. 109,948, the U.S. Pat. Nos. 5,740,892 and 5,412,546, the centrifugal force is applied for locking or unlocking a work piece, however, any of them is found imperfect in one way or another.
Besides, in a Taiwan patent No. 34,448, a vehicle's exhaust gas is taken as the power source in consideration of operational convenience, nonetheless, some common defects and security problems must be pondered deliberately.
Furthermore, a previously submitted application No. 089,200,156 of the present inventor sought for local patent is designed to take advantage of the vehicle's battery as power source for the sake of promoting convenience, simplifying structure, and cutting cost.
In whichever the abovesaid power wrench, the driving force directly or indirectly transmitted from a motor must exceed a least level in order to load or unload a work piece, and accordingly, a heavy-duty motor will be required for driving a relatively heavier load which seems a dilemma between the desired performance and the motor cost.
SUMMARY OF THE INVENTION
The primary object of this invention is to provide a clutch-buffer assembly for power wrench, wherein the power is transmitted to a driven article through a buffer structure so as to limit power consumption and keep smooth operation of the motor.
Another object of this invention is to provide a clutch-buffer assembly for power wrench, which is designed to offer a higher torque output by using vehicle's power for driving heavier loads with least power consumption and for convenience.
Yet another object of this invention is to provide a clutch-buffer assembly for power wrench, which can alleviate backlash caused by impacting for prolonging lifetime.
One more object of this invention is to provide a clutch-buffer assembly for power wrench applicable to a variety of work pieces in different measurements by a slight adjustment.
For more detailed information regarding this invention together with further advantages or features thereof, at least an example of preferred embodiment will be elucidated below with reference to the annexed drawings.
REFERENCES:
patent: 5379851 (1995-01-01), Huang
patent: 5435398 (1995-07-01), Juan
patent: 5740892 (1998-04-01), Huang
patent: 5887666 (1999-03-01), Chen et al.
patent: 5915484 (1999-06-01), Hsieh
patent: 5941319 (1999-08-01), Juan
patent: 6119794 (2000-09-01), Chen
patent: 6186247 (2001-02-01), Wang
Rosenberg , Klein & Lee
Smith Scott A.
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