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US 8,490,445 B2Granted
Electric door lock
AssigneeTong Lung Metal Industry Co., Ltd.
InventorsMing-Shyang Chiou, Chia-Min Sun, Yu-Ting Huang, Yu-Le Lin
Life of this patent
Estimating the term…
Abstract
A door lock includes a first driven wheel connected drivenly to a motor and having two resilient driving elements, and a second driven wheel connected drivenly to a rotary handle and the first driven wheel. The second driven wheel has a driven element disposed between and driven by the driving elements so that the second driven wheel moves to a first or second position to place a latch bolt in a latching or unlatching position. When the latch bolt is jammed, the second driven wheel is inoperative. However, as the driving elements are resilient, the first driven wheel can continue its rotation without being obstructed.
Claims22
An electric door lock comprising:
- a drive unit having a motor;
- a first driven wheel connected drivenly to said drive unit, and having opposite first and second faces, a central hole extending through said first and second faces, and two angularly spaced apart abutment faces formed on said first face at positions that are spaced radially from said central hole;
- a spring attached to said first face of said first driven wheel and having two angularly spaced apart driving elements respectively abutting against said abutment faces by a biasing force of said spring, said driving elements being rotatable along with said first driven wheel;
- a latch unit;
- an operating unit to operate said latch unit and having a rotary handle;
- and a second driven wheel connected drivenly to said operating unit, said second driven wheel having a driven element extending to said first face of said first driven wheel and disposed between said driving elements so as to be pushed by one of said driving elements;
- said second driven wheel being rotatable between a first position that places said latch unit in an unlatching position and a second position that places said latch unit in a latching position;
- wherein, when said drive unit drives said first driven wheel, one of said driving elements pushes said driven element to rotate said second driven wheel from said first position to said second position and the other one of said driving elements pushes said driven element to rotate said second driven wheel from said second position to said first position.
5 more elements
An electric door lock comprising:
- a drive unit having a motor, a first driven wheel connected drivenly to said motor, and having at least one resilient driving element;
- a latch unit;
- an operating unit to operate said latch unit and having a rotary handle;
- and a second driven wheel connected drivenly to said rotary handle, and having a driven element driven by said driving element;
- said driving element causing said second driven wheel and said driven element to rotate in a first angular direction when said first driven wheel is rotated in said first angular direction;
- said resilient driving element being pressed by said driven element when said first driven wheel rotates in said first angular direction and when said second driven wheel is obstructed from being rotated by said first driven wheel.
3 more elements
An electric door lock comprising:
- a drive unit having a motor;
- a first driven wheel connected drivenly to said drive unit, and having a driving element, said first driven wheel being rotatable between an original position and a final position;
- a latch unit;
- an operating unit to operate said latch unit and having a rotary handle;
- a second driven wheel connected drivenly to said rotary handle, said second driven wheel having a driven element to be moved by said driving element, said second driven wheel being rotatable-between a first position that places said latch unit in an unlatching position and a second position that places said latch unit in a latching position;
- an electronic control unit connected electrically to said motor, and having a first sensor switch proximate to said first driven wheel to detect varying positions of said first driven wheel, and a second sensor switch proximate to said second driven wheel to detect varying positions of said second driven wheel;
- said first driven wheel rotating between said original and final positions when said second driven wheel moves between said first and second positions;
- said electronic control unit activating or deactivating said motor based on a detected signal of said first sensor switch, and controlling of said motor to reverse a rotating direction thereof when said second sensor switch detects that said second driven wheel is obstructed from being rotated by said first driven wheel to change in position.
5 more elements
An electric door lock comprising:
- a drive unit having a motor;
- a first driven wheel connected drivenly to said drive unit, and having two axially opposite faces, a central hole extending through said opposite faces, and an arc-shaped rib that is formed on one of said faces around said central hole and that has two angularly spaced apart ends respectively formed with abutment faces;
- a spring that is attached to said one face of said first driven wheel, that is spaced apart from and around said central hole, and that is disposed between said abutment faces, said spring having two angularly spaced apart end portions abutting against said abutment faces, respectively;
- a latch unit;
- an operating unit to operate said latch unit and having a rotary handle;
- and a second driven wheel connected drivenly to said operating unit, said second driven wheel having a driven element extending to said one face of said first driven wheel and disposed between said end portions of said spring;
- said second driven wheel being movable between a first position that places said latch unit in an unlatching position and a second position that places said latch unit in a latching position;
- one of said end portions of said spring pushing said driven element to rotate said second driven wheel from said first position to said second position, the other one of said end portions of said spring pushing said driven element to rotate said second driven wheel from said second position to said first position.
5 more elements
An electric door lock comprising:
- a drive unit having a motor;
- a first driven wheel connected drivenly to said drive unit, and including two axially opposite faces, a central hole extending through said opposite faces, an arc-shaped groove formed in one of said faces around said central hole, and two angularly spaced apart abutment faces that are proximate to two angularly opposite ends of said arc-shaped groove, respectively;
- a spring that is attached to said one face of said first driven wheel, and that is spaced apart from and around said central hole, said spring having two angularly spaced apart end portions abutting against said abutment faces, respectively;
- a latch unit;
- an operating unit to operate said latch unit and having a rotary handle;
- and a second driven wheel connected drivenly to said operating unit, said second driven wheel having a driven element extending into said arc-shaped groove and between said end portions of said spring;
- said second driven wheel being movable between a first position that places said latch unit in an unlatching position and a second position that places said latch unit in a latching position;
- one of said end portions pushing said driven element to rotate said second driven wheel from said first position to said second position, the other one of said end portions pushing said driven element to rotate said second driven wheel from said second position to said first position.
5 more elements
Dependencies are inferred from the claim text.