Title: Double-piston rock drill

Abstract: A rock drill has a housing accommodating pistons defining working chambers. Rotary drive of a drill steel has an overrunning clutch and a screw pair. The screw pair is arranged between the pistons and is formed by outer and inner helical threads respectively provided on these pistons. One of the pistons is kinematically connected with the housing, and the other piston which cooperates, during the drilling, with a chuck receiving the drill steel shank is in force transmitting connection with the rotary drive of the drill steel. The invention is aimed at lowering vibration of the rock drill housing by arranging the screw pair of the rotary drive between the pistons.

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Inventors: Petreev, Anatoly Mikhailovich (ULIT, SA)
Lipin, Anatoly Alexeevich (ULIT, SA)
Rabko, Vladimir Davydovich
Suxov, Gennady Ilich (ULIT, SA)
Kunegin, Vladimir Ivanovich (ULIT, SA)
Kurdjukov, Alexandr Safronovich (ULIT, SA)

Application Number: 664000
Filing Date: 1976-03-04
Publication_date: 1977-07-19
Assignee:
Primary Class(es): 173/103 91/186, 91/533, 92/33, 92/65
Other Classes:
US Patent Ref:

841139	Jan, 1907	Gibson	93/33.
1039704	Oct, 1912	Curtis	92/65.
1932259	Oct, 1933	Warren	173/111.

Other Refs:
Primary Examiner: Purser, Ernest R.
Assistant Examiner: Pate, III, William F.
Attorney: