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US 12,359,462 B2Granted
Lock case interlockable with an anti-theft latch
AssigneeI-Tek Metal Mfg. Co., Ltd.
InventorTsung-Yu Huang
Life of this patent
Estimating the term…
Abstract
A lock case interlockable with an anti-theft latch is mounted on a door. The lock case includes a latch coupled with a latch hole in a door frame for retaining the door in a closed position. The anti-theft latch can be operated to engage with the door frame. When the latch is picked, the anti-theft latch still remains engaged with the door frame to prevent opening of the door. When normally operated, an inner operating device or an outer operating device can be operated to disengage the latch from the latch hole while disengaging the anti-theft latch from the door frame, permitting easy, convenient opening of the door.
Claims18
A lock case comprising:
- a case body;
- a latch movably coupled to the case body and movable between a latching position and an unlatching position;
- an interlocking member operatively coupled with the latch and including a push wall, wherein the push wall includes an upper end and a lower end;
- an anti-pick member pivotably mounted to the case body and including a first abutting portion, wherein the anti-pick member is pivotable between an anti-pick position and a non-anti-pick position;
- an anti-pick latch movably coupled to the case body and operatively connected to the anti-pick member, wherein the anti-pick latch is movable between an extended position and a retracted position, wherein when the anti-pick latch is in the extended position, the first abutting portion is spaced from the push wall of the interlocking member, and the anti-pick member remains in the non-anti-pick position, and wherein when the anti-pick latch is in the retracted position, the first abutting portion abuts against the push wall, and the anti-pick member is pivotable to the anti-pick position or the non-anti-pick position;
- a connecting member pivotably connected to the case body and operatively connected to the interlocking member, wherein pivotal movement of the connecting member actuates the interlocking member and the latch to move jointly between the latching position and the unlatching position, wherein when the latch is in the latching position and the anti-pick latch is in the retracted position, the anti-pick member is in the anti-pick position and the first abutting portion abuts the lower end of the push wall,
- wherein when the latch is in the latching position and the anti-pick latch is in the retracted position, the anti-pick member is in the non-anti-pick position and the first abutting portion abuts the upper end of the push wall, and wherein with the anti-pick member in the anti-pick position and the connecting member not pivoted, the interlocking member remains unmoved when the latch is picked to move from the latching position towards the unlatching position, such that the anti-pick member remains in the anti-pick position, preventing the latch from moving from the latching position to the unlatching position;
- the anti-pick latch movably coupled to the case body and movable between an anti-theft position and a non-anti-theft position;
- an unlocking spring disposed in the case body and biasing the anti-theft latch towards the non-anti-theft position;
- a slidable locking block movably coupled to the case body, wherein with the slidable locking block engaged with the anti-theft latch, the slidable locking block retains the anti-theft latch in the anti-theft position or the non-anti-theft position, wherein with the slidable locking block disengaged from the anti-theft latch 86, the anti-theft latch is permitted to move to the anti-theft position or the non-anti-theft position;
- an intermediate member pivotably mounted in the case body and interlocked with the connecting member;
- and
- an unlocking member interlocked with the intermediate member and operatively connected to the slidable locking block, wherein when the connecting member pivots and the latch moves from the latching position to the unlatching position, the unlocking member actuates the slidable locking block to disengage from the anti-theft latch, and the unlocking spring biases the anti-theft latch to move from the anti-theft position to the non-anti-theft position.
10 more elements
A lock case comprising:
- a case body;
- a latch movably coupled to the case body and movable between a latching position and an unlatching position;
- a connecting member pivotably connected to the case body, wherein pivotal movement of the connecting member actuates the latch to move between the latching position and the unlatching position,
- an anti-theft latch movably coupled to the case body and movable between an anti-theft position and a non-anti-theft position;
- an unlocking spring disposed in the case body and biasing the anti-theft latch towards the non-anti-theft position;
- a slidable locking block movably coupled to the case body, wherein when the slidable locking block engages with the anti-theft latch, the slidable locking block retains the anti-theft latch in the anti-theft position or the non-anti-theft position,
- wherein when the slidable locking block disengages from the anti-theft latch, the anti-theft latch is movable from the anti-theft position to the non-anti-theft position or from the non-anti-theft position to the anti-theft position;
- an intermediate member pivotably mounted in the case body and interlocked with the connecting member;
- and
- an unlocking member interlocked with the intermediate member and operatively connected to the slidable locking block,
- wherein when the connecting member pivots and the latch moves from the latching position to the unlatching position, the intermediate member actuates the unlocking member to pivot, which, in turn, actuates the slidable locking block to disengage from the anti-theft latch, wherein when the anti-theft latch is in the anti-theft position, the unlocking spring biases the anti-theft latch to move from the anti-theft position to the non-anti-theft position,
- wherein when the connecting member pivots and the latch moves from the unlatching position to the latching position, the slidable locking block moves to a position engaged with the anti-theft latch to retain the anti-theft latch in the non-anti-theft position.
9 more elements
Dependencies are inferred from the claim text.