Percussion device with a control valve for two alternately...

Details Percussion device with a control valve for two alternately... Percussion device with a control valve for two alternately...

2004-05-07

2008-12-16

Lopez, F. Daniel (Department: 3745)

Motors: expansible chamber type

Relatively movable working members with one having motive...

Position of one working member controls motive fluid for...

C091S275000, C091S300000, C060S374000

Reexamination Certificate

active

07464635

ABSTRACT:
The invention relates to a percussion device comprising two percussion pistons alternately making a percussion motion and a control valve for controlling the percussion pistons. The control valve (7) comprises a slide (8) affected by a force so that the slide is generally in a first position, but moves at the end of the percussion motion of the first percussion piston from the first position to a second position and correspondingly back to the first position at the end of the percussion motion of the second percussion piston (4).

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patent: 112705 (1997-03-01), None
patent: 7401334 (1975-08-01), None

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