Title: Impact wrench

Abstract: An impact wrench for tightening threaded joints by imparting a number of rotary blows to the threaded joint. The impact wrench comprises a housing which accommodates an impact clutch comprising an anvil and a hammer which consists of a driving member and a drive member, and a rotary drive of the hammer comprising an electric motor and a reduction gearing which has its output shaft mounted coaxially with the driving member of the hammer and is connected thereto for combined rotation only. The output shaft is connected to the driving member of the hammer by means of a spring-loaded pressure member accommodated in an axial bore of the output shaft and bodies of revolution contained in radial bores of the output shaft and engaging the spring-loaded pressure member. An annular groove is formed in the inner surface of the driving member of the hammer eccentrically relative thereto, and the bodies of revolution are received in the annular groove under the action of the spring-loaded pressure member.

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Inventors: Antipov, Georgy A.
Gelfand, Mikhail L.
Lavnikov, Nikolai S.
Teres, Leonid N.
Urazhdin, Ivan I.
Tsipenjuk, Yakov I.
Yakubovsky, Petr S.

Application Number: 867580
Filing Date: 1978-01-06
Publication_date: 1980-03-04
Assignee:
Primary Class(es): 173/93.6 464/35, 464/39
Other Classes:
US Patent Ref:

2146153	Feb, 1939	Mathewson	64/27.
3252300	May, 1966	Hofmann	64/27.
3952814	Apr, 1976	Gelfand et al.	173/93.
4108252	Aug, 1978	Stroezel	64/29.

Other Refs: 105783477267445386

May, 1959	DE
Nov, 1934	FR
Feb, 1962	PL

Primary Examiner: Staab, Lawrence J.
Assistant Examiner:
Attorney: Haseltine, Lake & Waters