Switching mechanisms

Details Switching mechanisms Switching mechanisms

E - Fixed Constructions

02

D

138/40

E02D 7/10 (2006.01)

Patent

CA 1097185

ABSTRACT OF THE DISCLOSURE The invention provides a hydraulically driven reciprocatory tool comprising a piston with a shoulder reciprocable within a cylinder, the space within the cylinder on one side of the shoulder being maintained at high pressure, and the space on the other side of the shoulder being maintained at low pressure. The piston is driven against a constant bias force by means of pressure fluid by means of which a driving force is cyclically applied to the piston under the control of a shuttle valve. The shuttle valve position is controlled by the axial position of the piston in the cylinder as sensed via the pressure of fluid in a signal line connecting the shuttle valve with first and second ports in the cylinder wall. The signal line has non-return valves for preventing flow of fluid from the shuttle valve to the first port, and from the second port to the shuttle valve. The driving force is applied to the piston via a duct in part of the cylinder body which projects into a recess in the piston. The projecting part can form a sliding seal with the recess to form a fluid tight enclosure in which the pressure of driving fluid can bear cyclically on the end of the blind bore. Alternatively the driving pressure fluid can act cyclically on a rod piston slideable in the duct within the projecting port so that the rod bears on the end of the blind bore, Preferably each non-return valve has associated therewith a variable throttle in the signal line, and according to a further preferred feature, means are provided for the controllable flow of fluid to or from the signal line.

306755

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