Heavy duty lock case

Patent metadata

Field	Value
Publication number	US-12338656-B2
Application number	US-202318150919-A
Country	US
Kind code	B2
Filing date	Jan 6, 2023
Priority date	Dec 19, 2022
Publication date	Jun 24, 2025
Grant date	Jun 24, 2025

Abstract

A heavy duty lock case is mounted on a door and includes a latch coupled with a door frame for retaining the door in a closed position. An anti-theft latch can be operated to engage with the door frame. The latch cooperates with an anti-pick member to avoid the latch from being picked to disengage from the door frame when the door is in the closed position. When normally operated, an inner operating device or an outer operating device can be operated to disengage the latch from the door frame 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 heavy duty 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 anti-pick member pivotably mounted to the case body, 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 latch and 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 anti-pick member remains in the non-anti-pick position, and wherein when the anti-pick latch is in the retracted position, the anti-pick member is pivotable to the anti-pick position;
a connecting member pivotably connected to the case body and operatively connected to the latch and the anti-pick member, wherein pivotal movement of the connecting member actuates the latch to move between the latching position and the unlatching position and is capable of actuating the anti-pick member to move between the anti-pick position and the non-anti-pick position, wherein when the latch is in the unlatching position, the anti-pick member is in the non-anti-pick position, and the anti-pick latch is in the extended position or the retracted position, wherein when the latch is in the latching position and the anti-pick latch is in the extended position, the latch is movable from the latching position to the unlatching position without pivoting the connecting member, wherein when the latch is in the latching position, the anti-pick latch is in the retracted position, and the anti-pick member is in the anti-pick position, the latch is prevented from moving from the latching position to the unlatching position, and wherein with the latch in the latching position, the anti-pick member in the retracted position, and the anti-pick member in the anti-pick position, when the connecting member pivots, the connecting member actuates the anti-pick member to move to the non-anti-pick position and then actuates the latch to move to the latching position;
an anti-theft latch movably coupled with the case body, wherein the anti-theft latch includes a plurality of latch heads, wherein the anti-theft latch is movable between an anti-theft position and a non-anti-theft position;
an unlocking spring movably received in the case body and biasing the anti-theft latch towards the non-anti-theft position;
a slidable locking block movably received in 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 one of the anti-theft position and the non-anti-theft position, and wherein when the slidable locking block disengages from the anti-theft latch, the anti-theft latch is permitted to move to the anti-theft position and the non-anti-theft position; and
an unlocking member pivotably received in the case body, wherein the unlocking member includes an actuating end interlocked with the slidable locking block and an interlocking end, wherein the connecting member further includes an unlocking arm abutting the interlocking end, wherein with the anti-theft latch in the anti-theft position and with pivotal movement of the connecting member actuating the latch to move towards the unlatching position, the unlocking arm presses against and pivots the unlocking member, the slidable locking block disengages from the anti-theft latch, and the unlocking spring biases the anti-theft latch to move to the non-anti-theft position.

2. The heavy duty lock case as claimed in claim 1 , wherein the connecting member further includes an unlatching arm and a push end, wherein the anti-pick member further includes a push face, wherein the latch further includes an interlocking member having a first actuating member, wherein the push end abuts the first actuating member, wherein when the anti-pick latch is in the retracted position, the push face abuts the unlatching arm, such that when the connecting member pivots, the unlatching arm presses against the push face to pivot the anti-pick member from the anti-pick position to the non-anti-pick position, the push end presses against the first actuating portion, thereby moving the latch from the latching position to the unlatching position.

3. The heavy duty lock case as claimed in claim 2 , wherein the anti-pick member further includes a side and a stop portion protruding from the side, wherein the anti-pick member further includes an abutting portion protruding from the stop portion away from the side, wherein the latch further includes a protrusion, wherein the anti-pick latch further includes a first actuating end and a second actuating end, wherein when the anti-pick latch is in the extended position, the second actuating end abuts the abutting portion, the anti-pick member is in the non-anti-pick position, and the stop portion is located outside of a movement path of the protrusion, the latch is movable from the latching position to the unlatching position, wherein when the anti-pick member is in the anti-pick position, the second actuating end disengages from the abutting portion, the stop portion is on the movement path of the protrusion, preventing the latch from moving from the latching position to the unlatching position.

4. The heavy duty lock case as claimed in claim 3 , wherein the connecting member further includes:
a first portion having a coupling portion, wherein the push end is located on the first portion; and
a second portion coupled with the coupling portion to pivot jointly, wherein the unlatching arm is located on the second portion, wherein when the first portion pivots, the second portion pivots together with the first portion.

5. The heavy duty lock case as claimed in claim 1 , further comprising:
a locking operation device mounted to the case body, wherein the locking operation device includes a push block operatively connected to a lock core; and
an unlatching rod including a push portion, a driven portion, and a coupling portion between the push portion and the driven portion, wherein the coupling portion is pivotably connected to the anti-theft latch, wherein when the anti-theft latch is in the anti-theft position, the driven portion of the unlatching rod is outside of a pivotal 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 pivotal 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 locking core is unlocked and pivots in a first direction, the push block presses against the driven portion, such that the push portion presses against and actuates the interlocking member to move, thereby moving the latch from the latching position to the unlatching position, wherein with the anti-theft latch in the non-anti-theft position and with the connecting member remained unmoved, when the lock core is unlocked and pivots in a second direction reverse to the first direction, the push block actuates the slidable locking block to disengage from the anti-theft latch and moves the anti-theft latch from the non-anti-theft position to the anti-theft position, and wherein with the anti-theft latch in the anti-theft position and with the connecting member remains unmoved, when the locking core is unlocked and pivots in the first direction, the push block actuates the slidable locking block to disengage from the anti-theft latch and moves the anti-theft latch from the anti-theft position to the non-anti-theft position.

6. The heavy duty lock case as claimed in claim 1 , wherein the anti-theft latch further includes an extension

Assignees

• I Tek Metal Mfg Co Ltd

Inventors

• Huang Tsung-Yu

Classifications

• E05B17/2003

  Preventing opening by insertion of a tool, e.g. flexible, between door and jamb to withdraw the bolt · CPC title

• E05B2015/0413

  loaded by compression · CPC title

• E05B63/0017

  Locks with sliding bolt without provision for latching · CPC title

• E05B15/108

  Bolts with multiple head (E05B65/0075 takes precedence) · CPC title

• E05B63/08

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