Impact apparatus and process for the control of impact apparatus

Details Impact apparatus and process for the control of impact apparatus Impact apparatus and process for the control of impact apparatus

1991-02-15

1992-03-10

Yost, Frank T.

Tool driving or impacting

Impacting devices

Selective axial direction of impact

173135, 91234, 175296, E21B 414

Patent

active

050943030

ABSTRACT:
In a device for controlling a pneumatic pile-driving or ram drilling apparatus having an internal, reciprocating ram, the control is effected in a forward stroke phase, a reverse stroke phase, and a subsidiary phase for the supply of air via a control device to a ram. The subsidiary control phase is a delay phase, in which subsidiary compressed air is fed to the front of the ram via time-delay means to take effect with an interval after that flow begins whereby to be substantially effective only in extending the reverse stroke of the ram. An apparatus is provided having a housing, in which the ram is reciprocated and compressed air admission is controlled by the control device which projects into the rear face of the ram and cooperates with the control ports in the ram to control the forward and reverse stroke movements of the ram. At least one supplementary control port, provides a time-delay device with which subsidiary compressed air is additionally fed on to the front of the ram. The secondary port extends rearwards towards the exterior and is axially forwards of the control port in the ram, such that admission of air is essentially effective only for extending the reverse stroke phase.

REFERENCES:
patent: 4295533 (1981-10-01), Schmidt
patent: 4480525 (1984-11-01), Jenne
patent: 4705119 (1987-11-01), Kostylev et al.
patent: 4821813 (1989-04-01), Jenne et al.
patent: 4932483 (1990-02-01), Rear

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