US 4,071,128 AGranted

Apparatus for shielding moving parts in fluid-operated machines

AssigneeJ. M. Voith GmbH

InventorsWalter Schmeisser, Johann Talasz

Life of this patent

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Abstract

A blow molding machine wherein a shield is movable to and from an operative position in which it prevents access to the mold sections. The hydraulic motors which move the mold sections can receive pressurized fluid only when the shield is locked in the operative position by a roller. When the roller is retracted from its arresting position, a mechanical power train automatically closes valves which are installed in conduits connecting the motors with oil pumps. The valve elements of the valves are mechanically coupled to each other and to the roller, and are biased by a spring which tends to maintain the roller in the arresting position. A single-acting hydraulic cylinder is employed to move the roller from the arresting position. The shield can be moved by hand and/or by a double-acting hydraulic cylinder.

Claims16

Dependent claims

Apparatus for shielding the moving parts of machines wherein the moving parts receive motion from at least one fluid-operated motor which is connected with a source of fluid by at least one conduit, comprising a shield which is movable to and from an operative position;

means for locking said shield in said operative position, including a blocking member movable to and from an arresting position in which said locking means maintains said shield in said operative position;
a valve installed in said conduit and having a valve element movable between first and second positions in which said valve respectively seals said source from said motor and allows fluid to flow therethrough;
and means for mechanically coupling said valve element with said blocking member so as to move said valve element to said first position in response to movement of said blocking member from said arresting position.

Dependencies are inferred from the claim text.

Facts

Application: 05/735,085Filed 22 Oct 1976
Priority: DT 25502048 Nov 1975
Granted: 31 Jan 1978
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

F16P 3/08
Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or…:…
B29C 45/84
Component parts, details or accessories; Auxiliary operations: safety devices
B29C 49/5605
Opening, closing or clamping means: hydraulically operated, i.e. closing or opening of the mould parts is done by hydraulic means
Y10T 74/2194
Guard mechanisms: automatic