Reciprocating percussive device

Details Reciprocating percussive device Reciprocating percussive device

E - Fixed Constructions

21

B

121/16, 121/31,

E21B 10/00 (2006.01) B25D 9/12 (2006.01) B25D 9/26 (2006.01) B25D 17/08 (2006.01)

Patent

CA 1325562

ABSTRACT Fig. 1 RECIPROCATING PERCUSSIVE DEVICE A hydraulic/pneumatic percussive device comprising a double- acting piston (60) which executes reciprocal motion and a tool or tool holder (90) which executes limited reciprocal motion due to the piston (60) striking it. The position of the tool or tool holder (90) relative to the piston stroke is maintained substantially constant by use of a spool valve which acts, through a drive gear (90B) and insert (90D) to apply greater or lesser fluid pressure to the tool or tool holder (90) in response to the axial thrust acting thereupon. The spool valve may e made adjustable to allow the maintained position of the tool or tool holder to be adjusted to cope with variations in axial thrust levels.

606783

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