Power operated door latch

• US 4,763,936 A
• Filed: 10/20/1986
• Issued: 08/16/1988
• Est. Priority Date: 10/20/1986
• Status: Expired due to Term

• Current Assignee: ITT Automotive Electrical Systems, Inc. (ITT, Inc.)
• Original Assignee: General Motors Corporation (General Motors Company)
• Inventors: Sloan, John L., Rogakos, Deno J., Licata, Joseph P.
• Primary Examiner(s): Smith, Gary L.
• Assistant Examiner(s): Nicholson, Eric K.
• Application Number:
  US06/920,651
• Time in Patent Office: 666 Days
• Field of Search: 292/201, 292/216, 292/280, 292/336.3, 292/144, 70/279
• US Class Current: 292/201
• CPC Class Codes: E05B 81/14 operating on bolt detents, e.g. for unlatching the bolt
• CPC Class Codes: E05B 81/20 for assisting final closing or for initiating opening
• CPC Class Codes: E05B 85/243 with a bifurcated bolt
• 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 292/308 Swinging catch

Abstract

An automobile door latch has a fork-type latch bolt, a detent lever which automatically retains the bolt in a closed-latched position in a manual-closed operating mode of the latch when the door is manually swung to the closed position, a manually actuated release lever which moves the detent lever to a releasing position releasing the bolt in a manual-open operating mode of the latch, and a power operating means which power rotates the bolt from an ajar-latched position to the closed-latched position in a power-closed operating mode of the latch and which moves the detent lever to the releasing position in a power-open operating mode of the latch. The door latch further includes an electrical control which automatically actuates the latch in the power-closed operating mode when the latch bolt achieves the ajar-latched position and which permits random sequencing of the manual and the power operating modes of the latch.

Claims

1. In combination with a vehicle door swingable on a vehicle body between an open position and a closed position in a door opening in said body and a striker on said body projecting into said door opening,

a door latch comprising:

a latch bolt on said door rotatable between unlatched, ajar-latched and closed-latched positions,

said striker engaging said latch bolt during movement of said door to and from said closed position so that said latch bolt is always in said unlatched position when said door is open and in said ajar-latched position when said door is in said ajar position and in said closed-latched position when said door is in said closed position,

detent means on said door having a detenting position engaging said latch bolt and retaining said latch bolt in either of said ajar-latched and said closed-latched positions and a releasing position permitting unobstructed rotation of said latch bolt to said unlatched position,

spring means on said door biasing said detent means to said detenting position so that whenever said latch bolt achieves said closed-latched position said detent means achieves said detenting position whereby said door latch retains said door in said closed position in a manual-closed operating mode when said door is swung manually to said closed position,

manual release means on said door selectively operable to move said detent means from said detenting position to said releasing position whereby said door latch releases said door in a manual-open operating mode for opening movement from said closed position,

a non-reversible electric motor on said door,

automatic switch means on said latch responsive to the position of said latch bolt operative when said latch bolt achieves said ajar-latched position to switch on said motor for a predetermined door closing duration,

first clutch means between said motor and said latch bolt operative to power rotate said latch bolt to said closed-latched position when said motor is switched on for said door closing duration whereby said door is closed in a power-closed operating mode of said door latch,

manual switch means selectively operable to switch on said motor after said predetermined door closing duration,

said automatic switch means being operative to thereafter switch off said motor after a predetermined door opening duration, and

mechanical release means between said motor and said detent means operative to move said detent means to said releasing position during said door opening duration of motor operation whereby said door is opened in a power-open operating mode of said door latch,

said automatic switch means being further operative to permit random sequencing of each of said power-open and said power-closed operating modes and said manual-open and said manual-closed operating modes.

2. The door latch recited in claim 1 wherein said first clutch means includes:

an output gear on said latch rotatable by said motor from an open-parked position to a closed-parked position when said motor is switched on for said door closing duration and from said closed-parked position to said open-parked position when said motor is switched on for said door opening duration,

a drive pin on said output gear traversing a circular orbit during rotation of said output gear,

means defining a plurality of sector gear teeth on said latch bolt,

a sector gear rotatably disposed on said latch engaging said latch bolt sector gear teeth, and

a drive lever rotatable as a unit with said sector gear,

said sector gear and said latch bolt sector gear teeth cooperating to locate said drive lever in intersecting relation to said drive pin circular orbit when said latch bolt is in said ajar-latched position so that said drive pin engages and rotates said drive lever to a position corresponding to said closed-latched position of said latch bolt during rotation of said output gear from said open-parked to said closed-parked position.

3. The latch bolt recited in claim 2 wherein said automatic switch means includes:

a first switch arm controlled by said latch bolt having a plurality of contact pads,

a second switch arm controlled by said output gear having a plurality of contact pads, and

electrical printed circuit means on said latch engaged by each of said first switch arm contact pads and by each of said second switch arm contact pads.

4. The door latch recited in claim 3 wherein said mechanical release means includes:

a release operating lever rotatably disposed on said latch, and

means connecting said release operating lever to said detent means for movement as a unit therewith,

said release operating lever being located in an inactive position intersecting said drive pin circular orbit when said detent means is in said detenting position, and

said drive pin engaging said release operating lever and moving said release operating lever to an active position corresponding to said detent means releasing position when said motor is switched on for said door opening duration.

5. The door latch recited in claim 4 further including:

a second clutch means between said latch bolt and said drive lever normally engaged to drivingly connect said drive lever to said latch bolt, and

manual operating means connected to said second clutch selectively operable to disengage said second clutch and thereby disconnect said latch bolt from said drive lever when said drive pin is engaged on said drive lever.

6. The door latch recited in claim 5 wherein:

said second clutch includes

a pawl lever between said drive lever and said latch bolt drivingly connected to said latch bolt,

a pawl on said pawl lever rotatable relative thereto between an engaged position and a disengaged position,

spring means biasing said pawl to said engaged position,

means defining notch in said drive lever receiving a portion of said pawl in said engaged position thereof whereby said drive lever is drivingly connected to said latch bolt, and

said manual operating means includes

a pawl release bar supported on said latch for reciprocation between a lifted position and a depressed position, and

a foot on said pawl release bar remote from said pawl in said lifted position of said release bar and engageable on said pawl to move said pawl to said disengaged position in said depressed position of said release bar.