Tool driving or impacting – Impacting devices – With anvil arranged to transmit torsional impact to tool
Patent
1978-11-03
1981-01-06
Schroeder, Werner H.
Tool driving or impacting
Impacting devices
With anvil arranged to transmit torsional impact to tool
B25D 1500
Patent
active
042431085
ABSTRACT:
An impact wrench comprises an anvil having impact jaws, a composite hammer including a driving part coupled to an output shaft of a pneumatic motor and a driven part having impact jaws for co-operating with the impact jaws of the anvil and mounted in the driving part for a combined rotation and a relative axial movement. A diametrical slot is provided in the driving part to receive a slider having its center of gravity offset relative to the hammer axis. The anvil receives a stub shaft mounted for a combined rotation together therewith and a relative axial movement and having a spring-loaded locking member co-operating with the slider. This construction of the pneumatic impact wrench enables a greater amount of kinetic energy to be transmitted into a threaded joint with each blow so as to improve the efficiency and reduce vibrations.
REFERENCES:
patent: 3174559 (1965-03-01), Vaughn
patent: 3610344 (1969-10-01), Schoeps
patent: 3804180 (1974-04-01), Gelfand et al.
patent: 3908768 (1975-09-01), Hess
patent: 3952814 (1976-04-01), Gelfand et al.
Antipov Georgy A.
Galimov Anas G.
Gelfand Mikhail L.
Goldshtein Boris G.
Kilin Viktor E.
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