Closure fasteners – Bolts – Sliding
Reexamination Certificate
1999-09-16
2001-01-30
Browne, Lynne H. (Department: 3629)
Closure fasteners
Bolts
Sliding
C292S341170, C292S335000
Reexamination Certificate
active
06179351
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a locking device with a movable indicator for sensing the “door closed” or “door open” position of a dead-bolt, provided with a pivotably journalled rotating cam (securing plate) intended to be moved between open and locked position by the released dead-bolt.
1. Background Art
A known lock comprises a lock case and a rotating cam (securing plate) with a U-shaped recess for a protruding dead-bolt. The rotating cam is pivotable about a shaft. A distinct movement is desirable for the rotating cam between locked and open position and it may be difficult to achieve this movement in certain positions of the axis of rotation of the rotating cam. See U.S. Pat. No. 3,861,727, for instance.
2. Description of the Invention
The object of the invention is to provide a solution to these and other associated problems of obtaining a secure and distinct locking action. The locking device according to the invention is characterized in that the rotating cam and the indicator are mutually connected by means of a spring, e.g. a tension spring, arranged in closed locking position to produce a force component in the closing direction of the rotating cam, and upon removal of the dead-bolt from the rotating cam, i.e. when the door is opened by means of the indicator, to be displaced in relation to the centre of rotation of the rotating cam so that a force component is obtained in opening direction and the rotating cam is turned to opening position by a snap action of the spring. This device gives a secure and distinct locking and opening action and a clear indication of whether the device is in locked or open position. Another advantage is that this lock requires only a small amount of space for fitting and placing.
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Browne Lynne H.
Vigil Thomas R.
Walsh John B.
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