Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber – Position responsive
Patent
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
Farber Martin A.
Maslousky Paul E.
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