US 2003/0127865 A1Published application

Swing bolt lock with improved tamper resistance and method of operation

AssigneeU-Code, Inc.

InventorKlaus W. Gartner

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Abstract

The locking bolt of a swing bolt lock has an elongated opening that fits on a shaft in the lock's housing. The shaft has a compression spring that biases the bolt toward one side of the shaft. In normal operation, the compression spring urges the bolt such that the shaft is at one end of the elongated opening. There, the swing bolt pivots about the shaft to unlock the lock. When a person tries to force the lock, the elongated opening of the bolt moves against spring bias along the shaft. In one embodiment, flat surfaces in the opening and on the shaft engage each other and a notch on the outside surface of the bolt engages a stationary safety key. This prevents the bolt from applying sufficient force to break weaker parts within the lock mechanism and force the lock open.

Claims24

Dependent claims

A lock comprising:

a housing having an opening for a locking bolt;
a shaft mounted in the housing, the shaft having an outside diameter;
a locking bolt having an elongated shaft receiving opening that receives the shaft, the elongated opening having first and second ends, the shaft receiving opening in the locking bolt being pivotally mounted on the shaft and pivoting the locking bolt between a locked position in which the extended portion projects out of the locking bolt opening and an unlocked position in which the extended portion is within the housing;
the locking bolt having a normal position relative to the shaft in which the shaft is at the first end of the shaft receiving opening and a second position in which the shaft is at the second end of the shaft receiving opening;
an actuator in the housing having a locked condition engaging the locking bolt when the extended portion of the locking bolt is out of the locking bolt opening and movable to an unlocked condition freeing the locking bolt to pivot so that the extended portion moves into the locking bolt opening;
a safety key in the housing, the locking bolt engaging the safety key when the locking bolt is in the second position as the locking bolt moves toward the unlocked position, the locking bolt not engaging the safety key when the locking bolt is in its normal position;
a bore in the shaft;
a spring extending into the bore and projecting out of the bore, the portion of the spring extending out of the bore in contact with the second end of the shaft receiving opening.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/041,811Filed 7 Jan 2002
Published: 10 Jul 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

E05B 47/0603
Controlling mechanically-operated bolts by electro-magnetically-operated detents: the detent moving rectilinearly
E05B 17/2034
Not following the movement of the bolt: moving pivotally or rotatively
E05B 17/2042
Not following the movement of the bolt: moving otherwise than only rectilinearly and only pivotally or rotatively
E05B 17/208
Securing, deadlocking or "dogging" the bolt in the fastening position: by means of an additional dogging movement of a rotary bolt