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Locking device for locking objects that move in relation to each other
| Details |
Inventors: Koch, Klaus; Sauer, Rainer; Schuttler, Oliver;
Assignee: Stabilus GmbH (Koblenz, DE)
Primary Examiner: Oberleitner; Robert J.
Assistant Examiner: Lipka; Pamela J.
Attorney, Agent or Firm: Baker Botts L.L.P.
A locking device includes a cylinder chamber that is filled with a working medium and is divided by a piston into two working sections. A flow connection between the working sections is controlled by a check valve and a gate valve, which are arranged in parallel. When the check valve opens, dynamic pressure of the working fluid flowing through the check valve from one working section acts on a fluid contact surface of the gate valve and opens the gate valve. After it opens, the gate valve is kept in the open position by a pressure in a bypass past the check valve so that working fluid can thereafter flow through the fluid connection, regardless of the state of the check valve. |
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DETAILED DESCRIPTION What is claimed is: 1.
A locking device comprising a cylinder defining a chamber that is filled with a working fluid, a piston dividing the chamber into two working sections, a flow connection between the working sections which is controlled by a first valve and a second valve arranged in parallel, the second valve being arranged to open only when the first valve opens in response to dynamic pressure of working fluid passing through the first valve, and the second valve once open being kept open by a pressure in a bypass past the first valve regardless of the state of the first valve.
2.
The locking device according to claim 1, wherein the second valve is a gate valve that opens or closes the bypass.
3.
The locking device according to claim 1, wherein the working medium that flows through the first valve and the working medium that flows through the bypass are combined in an accumulation chamber.
4.
The locking device according to claim 1, wherein a valve tappet of one of the two valves is functionally associated with an opening device, the opening device being controlled independently of the pressure conditions of the working medium at the two valves.
5.
The locking device according to claim 4, wherein the opening device includes a securing device which retains the valve tappet stationary during a relative motion of the piston and therefore opens the one of the two valves independently of the state of the other valve.
6.
The locking device according to claim 5, wherein the securing device includes a spring element, which holds the valve tappet against the force of a spring of the associated one of the two valves for one stroke length of the associated valve.
7.
The locking device according to claim 5, wherein the spring element cooperates with a cylinder-end stop and the location of the stop determines the defined stroke position.
8.
The locking device according to claim 4, wherein the securing device is arranged at a defined position along the stroke of the piston in the cylinder
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Vibration and Earthquake Isolation 
