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| Multi-stage process for demetalation and desulfurization of petroleum oils |
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| Converter circuit |
| I claim: 1. In a DC to DC converter having a transformer, a secondary winding on said transformer ... |
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| Switching regulator having parallel diode isolated primary windings and plural secondary windings |
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| Pulsed power converter with multiple output voltages |
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| Overload protection for a switch mode power supply |
| FIG. 1 illustrates an zero voltage switching forward converter or power supply 300. A protection ... |
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| Zero voltage, zero current, resonant converter |
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Lock with a double locking mechanism for a safe, bank compartment or the like
| Details |
Inventors: Deschamps, Daniel;
Assignee: Fichet-Bauche (FR)
Primary Examiner: Holko; Thomas J.
Assistant Examiner: Dino; Suzanne L.
Attorney, Agent or Firm: Steinberg & Raskin
The present invention relates to a lock with a double locking mechanism comprising a first locking mechanism having tumblers movable by a first key to authorize the operation, by means of a second key, of a second locking mechanism comprising a bolt associated with a releasable fingered bolt-retaining member through the medium of a link bar pivotally mounted on the releasable member and pivotally connected by one of its ends to the bolt, whereas the other end of the bar is adapted to co-operate with a retractable stop controlled from a distance. |
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DETAILED DESCRIPTION The present invention has for a purpose to obviate the need for such a special and necessarily intricate mechanism allowing the locking mechanism to be operable both by a key and from a distance and provides extremely simple and low-cost mechanical means allowing freeing the lock either from a distance or by means of a key, as desired, so as to authorize its opening.
To this end, the invention has for a subject matter a lock with a double locking mechanism, in particular for a bank compartment, and of the type including a first mechanism constituted by at least one tumbler movable by a first key to authorize the operation, by means of a second key, of a second mechanism constituted by at least one bolt associated with a releasable fingered bolt-retaining means adapted to co-operate with the said tumbler to allow the opening of the lock, characterized in that, with a view to providing the said lock with a means of control from a distance in addition to, and playing the same role as, said first key, a link bar is pivotally mounted on the said releasable fingered bolt-retaining means and is pivotally connected to the bolt by one of its ends, whereas the other end of the bar co-operates with a retractable stop controlled from a distance.
According to another feature of the lock, the said releasable bolt-retaining means is independent of the bolt and is mounted movably with respect to the lock casing so that it can enter the said tumbler when the latter has been moved to an appropriate position with respect to the said bolt-retaining means by means of the said first key.
According to still another feature of the invention, the said retractable stop is constituted by a movable stud controlled from a distance and constituting for example the core of an electro-magnet, which stud in the retracted position allows retracting the bolt by means of the said second key without translation of the said releasable bolt-retaining means.
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