Motors: expansible chamber type – Constantly applied motive fluid with controlled venting – Fluid vented through working member
Patent
1991-02-01
1992-05-26
Denion, Thomas E.
Motors: expansible chamber type
Constantly applied motive fluid with controlled venting
Fluid vented through working member
91 50, 91234, 91325, 173 91, F15B 1302
Patent
active
051157179
ABSTRACT:
A ramming apparatus having a shortened length without sacrificing ramming power requirements is disclosed comprising a housing having a front end and a rear end, a pneumatically driven percussion piston having a front end and a rear end operatively mounted in the housing for oscillating movement between the front end and the rear end of the housing, a front pressure chamber provided in the front end of the housing, a rear pressure chamber provided in the rear end of the housing, a high pressure air supply line, a control device for controlling the application of pneumatic pressure on the percussion piston, the control device having a control piston extending axially from the rear end of the percussion piston into an opening of an end piece of the housing and having at least one radial control channel that is closable by the end piece, and an axial channel provided in the percussion piston, wherein when the percussion piston is in a forward position the axial channel communicates with the radial control channel and the radial control channel communicates with the high pressure air supply line, and when the percussion piston is in a rear position the front pressure chamber communicates with the axial channel, the axial channel communicates with the radial channel, the radial channel communicates with the exterior beyond the end piece and the rear pressure chamber communicates with the high pressure air line.
REFERENCES:
patent: 1929197 (1933-10-01), Bridgham
patent: 3057331 (1962-10-01), Frantz
patent: 4070948 (1978-01-01), Tkach et al.
patent: 4114700 (1978-09-01), Tkach et al.
patent: 4194435 (1980-03-01), Gaun et al.
patent: 4480525 (1984-11-01), Jenne
patent: 4886128 (1989-12-01), Roemer
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