Control device for forward and backward travel of automatic _pne

Details Control device for forward and backward travel of automatic _pne Control device for forward and backward travel of automatic _pne

1982-01-27

1984-11-06

Maslousky, Paul E.

Motors: expansible chamber type

Fluid supply through diverse paths to single expansible chamber

Position responsive

91234, 91235, 91277, 91321, F15B 1522, F01L 2102, F01B 718

Patent

active

044805250

ABSTRACT:
A control device for working cycles of a self-propelled pneumatic boring device with a non-rotatable axially displaceable impact piston controllable by control edges of a control sleeve supported axially non-displaceably but rotatably and at its front end forming a control head with the control edges. The control head engaging in a cylindrical recess at a rear end of the impact piston cooperates with a radial main control opening formed in the impact piston in the vicinity of the recess. The control edges form two different pairs of the control edges, offset peripherally as well as axially such that respectively in one rotated position of the control sleeve only one of the pairs is aligned for cooperation with the main control opening. The impact piston is formed with at least one additional control opening which cooperates with the other pair and has a flow cross-section considerably smaller than that of the main control opening. The rear control edges of both of the pairs are formed in common by a rear circumferential edge of the control head.

REFERENCES:
patent: 1050951 (1913-01-01), Kessel
patent: 3026854 (1962-03-01), Wiedmann et al.
patent: 3138066 (1964-06-01), Walker
patent: 4100980 (1978-07-01), Jenne
patent: 4144941 (1979-03-01), Ritter
patent: 4284147 (1981-08-01), Jenne

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