Lock case interlockable with an anti-theft latch

Patent metadata

Field	Value
Publication number	US-12359462-B2
Application number	US-202217991956-A
Country	US
Kind code	B2
Filing date	Nov 22, 2022
Priority date	Nov 10, 2022
Publication date	Jul 15, 2025
Grant date	Jul 15, 2025

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.

First claim

The invention claimed is:

1. 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.

2. The lock case as claimed in claim 1 , further comprising a first spring, wherein the latch includes a rod extending therefrom, wherein first, second, and third retaining rings are disposed on the rod, wherein the second retaining ring is disposed between the first retaining ring and the third retaining ring, wherein the first spring is disposed between the first retaining ring and the case body and biases the latch to the latching position, wherein the interlocking member further includes first and second ends slidably coupled with the rod, wherein the first end of the interlocking member is located between the second and third retaining rings, and abuts the second retaining ring, wherein the second end of the interlocking member is disposed between the first and second retaining rings and abuts the connecting member, wherein when the interlocking member moves towards the first retaining ring, the first end of the interlocking member presses against the second retaining ring to move the latch from the latching position to the unlatching position, and wherein with the connecting member not pivoted and the anti-pick member in the anti-pick position, when the latch is picked to move from the latching position to the unlatching position, the second retaining ring moves away from the first end of the interlocking member, such that the interlocking member remains unmoved to reliably retain the anti-pick member in the anti-pick position.

3. The lock case as claimed in claim 2 , further comprising a second spring disposed between the second end of the interlocking member and the first retaining ring, wherein the second spring biases the interlocking member, and wherein with the anti-pick member in the anti-pick position and the connecting member not pivoted, when the latch is picked to move from the latching position towards the unlatching position, movement of the first retaining ring compresses the first spring, the second spring keeps the second end of the interlocking member to abut against the connecting member without movement, reliably retaining the anti-pick member in the anti-pick position.

4. The lock case as claimed in claim 1 , further comprising:
an unlatching rod including a push portion, a driven portion, and a coupling portion between the push portion and the driven portion, wherein the push portion is adjacent to the interlocking member, and wherein the coupling portion is operatively connected to the anti-theft latch; and
a locking operation device mounted to the case body and including a push block operatively connected to a lock core, wherein when the anti-theft latch is in the anti-theft position, the driven portion of the unlatching rod is outside of the rotational path of the push block, wherein when the anti-theft latch is in the non-anti-theft position, the driven portion of the unlatching rod is on the rotational path of the push block, wherein with the anti-theft latch in the non-anti-theft position and the connecting member remained unmoved, when the lock core is unlocked and drives the push block to pivot in the first direction, the driven portion of the unlatching rod is pressed, and the push portion of the unlatching rod presses against and actuates the interlocking member to thereby move the latch from the latching position to the unlatching position, wherein with the anti-theft latch in the non-anti-theft position and the connecting member remained unmoved, when the lock core is unlocked and drives the push block to pivot in a second direction reverse to the first direction, the sliding locking block is actuated to disengage from the anti-theft latch, and the anti-theft latch moves from the non-anti-theft position to the anti-theft position, and wherein with the anti-theft latch in the anti-theft position and the connecting member remained unmoved, when the lock core is unlocked and drives the push block to pivot in the first direction, the slidable locking block disengages from the anti-theft latch, and the anti-theft latch moves from the anti-theft position to the non-anti-theft position.

5. The lock case as claimed in claim 1 , further comprising a third spring, wherein the anti-pick member further includes a second abutting portion spaced from the first abutting portion, and wherein the third spring is disposed between the second abutting portion and the c

Assignees

• I Tek Metal Mfg Co Ltd

Inventors

• Huang Tsung-Yu

Classifications

• E05B55/00

  Locks in which a sliding latch is used also as a locking bolt · CPC title

• E05B63/0017

  Locks with sliding bolt without provision for latching · CPC title

• E05C1/08

  with latching action · CPC title

• E05B63/08

  Mortise locks {(mortised work B27F5/12)} · CPC title

• E05B65/1086

  Locks with panic function, e.g. allowing opening from the inside without a ley even when locked from the outside · CPC title