Tool driving or impacting – Impacting devices – Selective axial direction of impact
Patent
1978-12-18
1981-08-18
Maslousky, Paul E.
Tool driving or impacting
Impacting devices
Selective axial direction of impact
91234, 91277, 91321, 92165PR, 175 19, F01L 2102, F01B 718
Patent
active
042841470
ABSTRACT:
Control device for the forward movement and rearward movement of self-driven pneumatic ram boring devices with an impact piston which is axially displaceable between two abutments in a tubular housing, with the axial forward movement and rearward movement of the ram boring device being controllable by rigid control edges of an adjustable control sleeve, the latter being supported on a bearing ring arranged in the rear part of the housing. Through the bearing ring there is led a part of the control sleeve forming a feed tube for the compressed air for connection to a compressed air hose, the sleeve having a piston-like control head containing the control edges; the control head engaging in a cylindrical recess at the rear end of the impact piston cooperates with radial control bores which are formed in the area of the recess in the impact piston. The control sleeve is mounted non-displaceably in the axial direction however rotatably in the bearing ring and is provided with at least four control edges. The control edges respectively are each arranged in pairs with axial spacing corresponding to the control stroke of the impact piston and are offset in the peripheral direction as well as in the longitudinal direction, such that respectively only one pair of the control edges cooperates with the control bores. The bores are arranged only on a part of the periphery of the impact piston and the impact piston is non-rotatably guided in the housing.
REFERENCES:
patent: 1050951 (1913-01-01), Kessel
patent: 3026854 (1962-03-01), Wiedmann et al.
patent: 3896703 (1975-07-01), Bertanza
patent: 4100980 (1978-07-01), Jenne
patent: 4144941 (1979-03-01), Ritter
Farber Martin A.
Maslousky Paul E.
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