Two-hand safety control mechanism
AssigneeHerion-Werke KG
InventorsGunter Baldauf, Helmut Ott
Life of this patent
Estimating the term…
Abstract
A two hand safety control mechanism for a consumer actuated by pressure medium includes a safety valve blocking the supply of pressure medium during a faulty switching and venting the consumer. For maintaining a working position of the consumer, a plurality of control valves are provided which are dynamically self-regulating. By actuating a further control valve, the automatic retention can be cancelled in order to allow the consumer to return in its idle position.
Claims18
A two-hand safety control mechanism for a consumer having an inlet connection and being operated by a pressure medium fed from a supply connection;
- comprising:
- valve means for shifting the consumer between an idle position and a working position and including first and second directional control valves placed in parallel and actuated by pilot valves via connecting control lines, each of said directional control valves being mechanically linked with a slide gate and communicating with the supply connection via the slide gate of the other one of said directional control valves, said directional control valves being linked to said inlet connection for supplying pressure medium to one side of the consumer;
- a third directional control valve connecting the other side of the consumer directly to the supply connection;
- and
- an AND-valve having at least two inputs connected to said control lines arranged between said first and second directional control valves and said associated pilot valves and an output cooperating with said third directional control valve.
A two-hand safety control mechanism for a consumer;
- comprising:
- first valve means cooperating with the consumer for shifting the latter from an idle position to a working position by admitting a pressure medium from a supply connection to one side of the consumer;
- and
- actuating means for controlling said first valve means;
- and
- second valve means for relieving and pressurizing the other side of the consumer, said second valve means including an AND-valve having at least two inputs operatively connected to said actuating means and an output, and a control valve controlled by said output of said AND-valve and provided between the supply connection and the consumer, said second valve means relieving the other side of the consumer when the latter is moved to its working position by said first valve means and allowing admission of pressure medium to the other side of the consumer to return the latter to its idle position.
Dependencies are inferred from the claim text.