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Handle locking mechanism for quarter turn valves
| Details |
Inventors: Roberts, John L.;
Assignee: Milwaukee Valve Company, Inc (Milwaukee, WI)
Primary Examiner: Walton; George L.
Assistant Examiner:
Attorney, Agent or Firm: Michael, Best & Fredrich
A rotatable control device including a body housing a control structure and having an external box; a control shaft journalled in the boss for rotation about an axis and having an internal portion connected to the control structure and an external portion extending outwardly from the boss; an operating handle having an inner end portion connected to the external portion of the control shaft, a gripping end portion for rotating the control structure between first and second positions and an intermediate portion; first and second locking structure circumferentially spaced on the body at locations corresponding to the positions of the intermediate portion of the handle when the control structure is in the first and second positions, respectively; a slider member slidably mounted on the intermediate portion of the handle for reciprocative movement between locked and unlocked positions; interlocking structure for cooperating with the first and second locking structure, when the handle is in the first and second position, respectively, and the slider member is in the locking position, to restrain rotational movement of the handle; and bias structure for biasing the slider member toward the locked position irrespective of the orientation of the handle. |
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DETAILED DESCRIPTION One of the principal objects of the invention is to provide a simply constructed locking mechanism for rotatable control devices, such as quarter turn valves, for positively locking an operating handle connected to a rotatable control means, such as a valve member, in a selected position against unauthorized tampering.
Another object of this invention is to provide such a locking mechanism including means for maintaining it a locked position regardless of the orientation of the valve.
A further object is to provide such a valve which can be easily constructed.
This invention provides a locking mechanism for rotatable control devices including a body housing a control means, a control shaft journalled in an external boss on the housing for rotation about an axis and connected to the control means, an operating handle having an inner end portion connected to an external portion of the control shaft, a gripping end portion for rotating the control means between first and second positions and an intermediate portion, and first and second locking means on the body at locations corresponding to the positions of the intermediate portions of the handle when the control means is in the first and second positions.
The locking mechanism includes a slider member slidably mounted on the intermediate portion of the handle for reciprocative movement between locking and unlocked positions, interlocking means for cooperating with the first and second locking means, when the handle is in the first and second position, respectively, and the slider member is in the locking position, to restrain rotational movement of the handle and bias means for biasing the slider member toward the locked position irrespective of the orientation of the handle.
The bias means preferably is a compression spring with one end bearing against the slider member in a manner to bias the slider member forward the locked position.
In one embodiment, the intermediate portion of the handle includes an elongated slot extending generally parallel to the travel path of the slider member between the locked and unlocked positions and a compression spring is disposed in the slot with one end bearing against one end of the slot and the other end bearing against a stop means on the slider member
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