Bidirectional hydraulic jar
First Claim
1. A double-acting hydraulic striking tool comprising a plurality of pistons which are adapted to open and close a flow of liquid, and wherein one of the plurality of pistons in a closed condition and with an appurtenant moving mass is displaceable from a first end position to a second end position by a hydraulic force;
- a spring is simultaneously tensioned by the hydraulic force to thereby open said piston to permit the flow of liquid, and neutralize the hydraulic force against the piston, said tensioned driving spring driving the mass back to rest against a rigid portion of striking tool, whereby a striking effect arises such that the piston returns to the first end position and again closes the flow of liquid and wherein the pistons are adapted to open to permit the flow of liquid when the liquid pressure exceeds an adjustable value.
1 Assignment
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Accused Products
Abstract
A double-acting hydraulic striking tool, wherein a hammer'"'"'s (8) upper end (9) is rigidly connected to an upper piston (10), and wherein the hammer'"'"'s (8) lower end (26) is rigidly connected to a lower piston (26). The pistons (10, 27), which can be displaced within a tubular housing (11), are adapted to open and close for a forced flow of liquid from the upper end (9) of the hammer (8) towards the lower end (26). The hammer (8) is activated for downwardly directed blows by pressing against the hammer'"'"'s (8) upper end (9) with a resilient force, causing the lower piston (27) to close the liquid flow, whereby the housing (11) is lifted hydraulically until the piston (27) opens for the liquid flow, and the forced spring force drives the housing (11) downwardly to impinge on the hammer'"'"'s (8) lower end (26) through impact faces (34, 36). The hammer (8) is activated for upwardly directed strokes by lifting the upper end (9) of the hammer (8) as well as the housing (11) with a resilient force, so that the upper piston (10) closes for liquid, whereby the piston (10) drives the hammer'"'"'s (8) upper end (9) downwardly until the piston (10) opens for liquid, whereafter the upwardly acting resilient force drives the hammer'"'"'s (8) upper end (9) upwards to impinge on the housing (11) through impact faces (33, 35).
33 Citations
6 Claims
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1. A double-acting hydraulic striking tool comprising a plurality of pistons which are adapted to open and close a flow of liquid, and wherein one of the plurality of pistons in a closed condition and with an appurtenant moving mass is displaceable from a first end position to a second end position by a hydraulic force;
- a spring is simultaneously tensioned by the hydraulic force to thereby open said piston to permit the flow of liquid, and neutralize the hydraulic force against the piston, said tensioned driving spring driving the mass back to rest against a rigid portion of striking tool, whereby a striking effect arises such that the piston returns to the first end position and again closes the flow of liquid and wherein the pistons are adapted to open to permit the flow of liquid when the liquid pressure exceeds an adjustable value.
- View Dependent Claims (2, 3, 4, 5, 6)
Specification