Safety valve for hydraulic or pneumatic tool
AssigneeOgon Contracting Pty Ltd.
InventorLuke Roger Gosden
Life of this patent
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Abstract
Provided is a safety valve (10) comprising a body (12) which defines an incoming fluid passage (14) and a return fluid passage (20). The incoming fluid passage (14) generally enables a fluid to pass from a fluid reservoir (18) through the body (12) to the tool head (16). The return fluid passage (20) generally enables a fluid to return from the tool head (16) through the body back to the fluid reservoir (18). The body (12) further comprises a diverter (22) which is displaceable between an active position and an inactive position. When the diverter (22) is in the active position, the diverter (22) redirects the fluid via a shunting passage (24) from the incoming fluid passage (14) to the return passage (20) to prevent operation of the tool head (16).
Claims20
A safety valve for a hydraulic or pneumatic tool, the safety valve comprising:
- a body defining an incoming fluid passage via which fluid is able to pass from a fluid reservoir through the body to a tool head, and a return fluid passage via which fluid is able to return from the tool head through the body to the fluid reservoir;
- a diverter displaceably arranged between at least two positions, wherein in a first position of the at least two positions the fluid is able to bypass the tool head and return to the fluid reservoir to prevent operation of the tool head and in a second position of the at least two positions the fluid is able to flow to the tool head to allow operation of the tool head;
- a biasing means operatively biasing a tapered portion of the diverter into either a fail-safe position or a fail-dangerous position;
- and
- an actuator positioned directly on an outside portion of the body, wherein the actuator is configured so that actuation thereof counteracts the biasing means and actuates the diverter into one of the at least two positions.
A hydraulic or pneumatic tool assembly comprising:
- a tool head;
- a fluid reservoir for operatively supplying the tool head with hydraulic or pneumatic fluid;
- a safety valve fitted to the tool head, wherein the safety valve has a body defining an incoming fluid passage via which fluid is able to pass from the fluid reservoir through the body to the tool head, and a return fluid passage via which fluid is able to return from the tool head through the body to the fluid reservoir;
- a diverter displaceably arranged between at least two positions, wherein in a first position of the at least two positions the fluid is able to bypass the tool head and return to the fluid reservoir to prevent operation of the tool head and in a second position of the at least two positions the fluid is able to flow to the tool head to allow operation of the tool head;
- a biasing means operatively biasing a tapered portion of the diverter into either a fail-safe position or a fail-dangerous position;
- and
- an actuator positioned directly on an outside portion of the body, wherein the actuator is configured so that actuation thereof counteracts the biasing means and actuates the diverter into one of the at least two positions.
Dependencies are inferred from the claim text.