POWER RELEASE DOUBLE-LOCKING LATCH

• US 20070210588A1
• Filed: 08/10/2005
• Published: 09/13/2007
• Est. Priority Date: 08/10/2004
• Status: Active Grant

• Current Assignee: Magna Closures Company Limited (Magna International Incorporated)
• Original Assignee: Magna Closures Company Limited (Magna International Incorporated)
• Inventors: Cetnar, Roman
• Granted Patent: US 7,827,836 B2
• Time in Patent Office: Days
• US Class Current: 292/216
• CPC Class Codes: E05B 77/26 specially adapted for child safety
• CPC Class Codes: E05B 77/28 for anti-theft purposes, e.g. double-locking or super-locking
• CPC Class Codes: E05B 77/54 Automatic securing or unlocking of bolts triggered by certain vehicle parameters, e.g. exceeding a speed threshold triggered by vehicle collision E05B77/12
• CPC Class Codes: E05B 79/20 using flexible connections, e.g. Bowden cables
• CPC Class Codes: E05B 81/06 using rotary motors
• CPC Class Codes: E05B 81/14 operating on bolt detents, e.g. for unlatching the bolt
• CPC Class Codes: E05B 81/16 operating on locking elements for locking or unlocking action
• CPC Class Codes: E05B 81/36 Geared sectors, e.g. fan-shaped gears
• CPC Class Codes: E05B 81/76 Detection of handle operation; Detection of a user approaching a handle; Electrical switching actions performed by door handles
• CPC Class Codes: E05B 81/90 Manual override in case of power failure
• CPC Class Codes: Y10S 292/23 Vehicle door latches
• CPC Class Codes: Y10T 292/1047 Closure
• CPC Class Codes: Y10T 292/1082 Motor
• CPC Class Codes: Y10T 70/5889 For automotive vehicles
• CPC Class Codes: Y10T 70/5978 With switch
• CPC Class Codes: Y10T 70/7062 Electrical type [e.g., solenoid]
• CPC Class Codes: Y10T 70/7102 And details of blocking system [e.g., linkage, latch, pawl, spring]

Abstract

A power-release door lock system for an automotive door having a latch, including a ratchet (18) and pawl (20), and an electro-mechanical exterior latch release mechanism (220) for actuating the pawl to release the ratchet. The system includes a controller (210) and a pressure sensitive switch (216) mounted to an outside door handle (214) of the automotive door and electrically connected to the controller. The controller is programmed to disable the pressure sensitive switch in response to a predetermined “lock” signal and enable the pressure sensitive switch in response to a pre-determined “unlock” signal, in which case the controller energizes the exterior latch release mechanism to release the ratchet in the event the pressure sensitive switch is actuated. The system eliminates the need for an exterior lock assembly and its attendant inside lock button or rod.

Claims

1. A door lock system for an automotive door, comprising:

a latch, including a ratchet (18) biased to a latched position and moveable to a released position, a pawl (20) biased to engage the ratchet in the latched position, and an electromechanical exterior latch release mechanism (220) for actuating the pawl to release the ratchet;

a controller (210);

a pressure sensitive switch (216) mounted on, in or proximate to an outside door handle (214) of the automotive door and electrically connected to the controller;

wherein said controller is programmed to disable the pressure sensitive switch in response to a predetermined “

lock”

signal and enable the pressure sensitive switch in response to a pre-determined “

unlock”

signal, in which case the controller energizes the exterior latch release mechanism to release the ratchet in the event the pressure sensitive switch is actuated.

2. A system according to claim 1, wherein the exterior latch release mechanism comprises a first gear (34) for actuating the pawl to release the ratchet and a first motor assembly (30), electrically connected to the controller, for driving the first gear (34).

3. A system according to claim 1, including a key cylinder (218), mounted on, in or proximate to the outside door handle, the key cylinder being kinematically connected to the first gear (34) for mechanically actuating the pawl to release the ratchet.

4. A system according to claim 3, wherein the key cylinder is connected to the first gear (34) via a cable (200) connected to an arm (206) rigidly connected to the first gear (34), the arm (206) freewheeling when the first gear (34) is actuated by the first motor assembly (30).

5. A system according to claim 4 including an inside door handle (222), and wherein the latch further includes:

an interior latch release mechanism (230), connected to the inside door handle, for actuating the pawl to release the ratchet; and

an electromechanical interior locking assembly (240), electrically connected to the controller, for selectively decoupling the interior latch release mechanism from the pawl.

6. A system according to claim 5, wherein the interior latch release mechanism comprises:

an inside release lever (40) pivotally mounted in the latch, the inside release lever being connected via a cable to the inside release handle;

an auxiliary release lever (42) pivotally mounted in the latch, the auxiliary release lever being engagable with the pawl; and

a link element (38) moveable between an unlocked position, wherein the inside release lever is kinematically coupled with the auxiliary release lever, and a locked position, wherein the inside release lever is kinematically de-coupled from the auxiliary release lever such that actuation of the inside release lever does not cause a corresponding movement of the auxiliary release lever.

7. A system according to claim 6, wherein the electromechanical interior locking assembly comprises:

a second gear (36) connected to the link element; and

a second motor assembly (32), electrically connected to the controller, for driving the second gear (36) and the link element connected thereto between the locked and unlocked positions.

8. A system according to claim 7, wherein the second gear (36) includes a safety backup arm (158) that is positioned into the rotational path of an arm (116A) on the pawl when the second gear (36) is in the locked position so that, if actuated, the pawl arm forces the second gear (36) and the link element into the unlocked position.

9. A system according to claim 5, wherein the pawl couples the exterior latch release mechanism to the interior lock assembly.

10. A latch, comprising:

a housing;

a ratchet (18), pivotally mounted to the housing, the ratchet being biased to a latched position and moveable to a released position;

a pawl (20) pivotally mounted to the housing and biased to engage the ratchet in the latched position;

a first sector gear (34), pivotally mounted in the housing, for actuating the pawl to release the ratchet;

a first motor assembly (30) mounted in the housing for selectively driving the first sector gear (34);

an arm (200) rigidly connected to or integral with the first gear (34); and

a cable (200) connected to the arm for manually actuating, wherein the arm freewheels when the first gear (34) is actuated by the first motor assembly (30).

11. A latch according to claim 10, including:

an inside release lever (40) pivotally mounted to the housing;

an auxiliary release lever (42), pivotally mounted to the housing, the auxiliary release lever being engagable with the pawl; and

a link element (38) moveable between an unlocked position, wherein the inside release lever is kinematically coupled with the auxiliary release lever, and a locked position, wherein the inside release lever is kinematically de-coupled from the auxiliary release lever such that actuation of the inside release lever does not cause a corresponding movement of the auxiliary release lever

12. A latch according to claim 11, including:

a second sector gear (36), pivotally mounted to the housing, and connected to the link element; and

a second motor assembly (32) mounted in the housing for selectively driving the second gear (36) and the link element connected thereto between the locked and unlocked positions.

13. A latch according to claim 12, wherein the second gear (36) includes a safety backup arm (158) that is positioned into the rotational path of an arm (116A) on the pawl when the second gear (36) is in the locked position so that, if actuated, the pawl arm forces the second gear (36) and the link element into the unlocked position.

14. A latch for an automotive door, comprising:

a latch housing having a first and a second surface, the first surface having a channel adapted to receive a striker;

a latch cover adapted to cooperate with the upper housing to form an interior cavity;

a ratchet and pawl, each of the ratchet and pawl pivotally mounted to the first surface and a portion of the pawl extending into the interior cavity, the ratchet and pawl cooperatively operable to move between a latched position to hold the striker in the channel, and a released position to permit the striker from exiting the channel, the ratchet and pawl being biased towards the latched position;

an exterior latch release mechanism, mounted to the lower housing within the cavity, comprising a first means for actuating the pawl to release the ratchet and a first electromechanical means for selectively actuating the first pawi-actuating means;

an interior latch release and locking assembly, mounted to the lower housing within the cavity, comprising a second means for actuating the pawl to release the ratchet, means for connecting an inside release handle, and a second electromechanical means for selectively coupling or de-coupling the second pawl-actuating means from the handle-connecting means, the interior latch release and locking assembly being selectively operable to move between an unlocked state, wherein the handle-connecting means is kinematically coupled to the second pawl-actuating means, and a locked state, wherein the handle-connecting means is decoupled from the second pawl-actuating means; and

means comprising an arm on the pawl for driving the second electro-mechanical means into the unlocked state from the locked state, whenever the pawl is actuated to release the ratchet.

15. A latch according to claim 14, wherein:

the first electromechanical means includes an electric motor with a worm screw on the output shaft of the electric motor; and

the first pawl-actuating means includes a first sector gear, rotatably mounted to the surface of the latch housing within the cavity and coupled to the worm screw, and a pin, extending from the surface of the first sector gear and abutting a portion of the pawl extending into the interior cavity so that rotating the sector gear actuates the pawl.

16. A latch according to claim 15, wherein the first sector gear can be actuated by cable means, in addition to the first electromechanical means.

17. A latch according to claim 16, wherein the cable means include an emergency cable coupled at a first end to the first sector gear and at a second end, a key cylinder, whereby rotating the key cylinder actuates the first sector gear.

18. A latch according to claim 17, wherein the key cylinder is mounted to at least one of the exterior of a vehicle door and an outside vehicle door handle.

19. A latch according to claim 14, wherein:

the second pawl-actuating means includes an auxiliary inside release lever, rotatably mounted to the lower housing within the cavity and operable to actuate the pawl;

the handle-connecting means comprises an inside release lever having a first end and a second end, the first end being rotatably mounted to the auxiliary inside release lever and the second end being connected to a cable;

the second electromechanical means includes an electric motor with a worm screw on the output shaft of the electric motor, a second sector gear rotatably mounted to the surface of the tower housing within the cavity, driven by the worm screw, and a door lock link, rotatably coupled at a first end to the second sector gear and moveable between a first position where the second end engages a hook on the auxiliary inside release lever so that actuating the door lock link also actuates the auxiliary inside release lever, and a second position where the second end is disengaged from the hook on the auxiliary inside release lever, so that the door lock link rotates freely.