IP Library Granted Patent US 7,971,393
Granted Patent B2
US 7,971,393 · App. 11/929,226 · Granted Jul 5, 2011

Door actuation systems

Assignee: GM Global Technology Operations LLC
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Quick Facts
Patent No.
US 7,971,393
App. No.
11/929,226
Granted
Jul 5, 2011
Kind
B2
Abstract

A door system includes a structural member and a door that is movably mounted with respect to the structural member for movement between an open position and a closed position. A spring is mounted with respect to the structural member or the door and being sufficiently positioned to bias the door toward its open position when the door is in its closed position. Active material based actuators may selectively compress the spring prior to door closure to minimize door closing effort.

Claims (12)

1. A door system comprising:

a structural member;

a door being movably mounted with respect to the structural member for movement between an open position and a closed position; and

a spring mounted with respect to the structural member or the door and being sufficiently positioned to bias the door toward its open position when the door is in its closed position;

wherein the door defines a door cavity and an aperture;

wherein the door system further comprises a generally L-shaped bracket having a first arm portion and a second arm portion, said second arm portion of said bracket being pivotably mounted with respect to each of the door and the structural member outside the door such that the bracket is selectively rotatable with respect to each of the door and the structural member;

said first arm portion extending through said aperture and into said door cavity; and

said spring circumscribing the first arm portion outside the door cavity.

2. The door system of claim 1 , wherein the spring urges the door and the second arm portion apart from one another when the door is in the closed position.

3. The door system of claim 1 , further comprising an actuator including an active material being configured to undergo a change in at least one attribute in response to an activation signal; said active material being operatively connected to the door and the bracket such that said change in at least one attribute causes the bracket to move relative to the door to a position in which the spring is compressed.

4. The door system of claim 3 , further comprising a latch configured to releasably maintain the bracket in the position in which the spring is compressed.

5. The door system of claim 4 , wherein the latch includes a pin.

Assignments (12)
RELEASE OF SECURITY INTEREST Recorded Nov 7, 2014
From: WILMINGTON TRUST COMPANY
To: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Reel/Frame 034185/0587 →
CHANGE OF NAME Recorded Feb 10, 2011
From: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
To: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Reel/Frame 025781/0035 →
SECURITY AGREEMENT Recorded Nov 8, 2010
From: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
To: WILMINGTON TRUST COMPANY
Reel/Frame 025324/0057 →
RELEASE OF SECURITY INTEREST Recorded Nov 5, 2010
From: UAW RETIREE MEDICAL BENEFITS TRUST
To: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Reel/Frame 025315/0001 →
RELEASE OF SECURITY INTEREST Recorded Nov 4, 2010
From: UNITED STATES DEPARTMENT OF THE TREASURY
To: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Reel/Frame 025245/0780 →
SECURITY AGREEMENT Recorded Aug 28, 2009
From: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
To: UAW RETIREE MEDICAL BENEFITS TRUST
Reel/Frame 023162/0187 →
SECURITY AGREEMENT Recorded Aug 27, 2009
From: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
To: UNITED STATES DEPARTMENT OF THE TREASURY
Reel/Frame 023156/0215 →
RELEASE OF SECURITY INTEREST Recorded Aug 21, 2009
From: CITICORP USA, INC. AS AGENT FOR BANK PRIORITY SECURED PARTIES; CITICORP USA, INC. AS AGENT FOR HEDGE PRIORITY SECURED PARTIES
To: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Reel/Frame 023155/0880 →
RELEASE OF SECURITY INTEREST Recorded Aug 20, 2009
From: UNITED STATES DEPARTMENT OF THE TREASURY
To: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Reel/Frame 023124/0670 →
SECURITY AGREEMENT Recorded Apr 16, 2009
From: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
To: CITICORP USA, INC. AS AGENT FOR BANK PRIORITY SECURED PARTIES; CITICORP USA, INC. AS AGENT FOR HEDGE PRIORITY SECURED PARTIES
Reel/Frame 022554/0479 →
SECURITY AGREEMENT Recorded Feb 4, 2009
From: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
To: UNITED STATES DEPARTMENT OF THE TREASURY
Reel/Frame 022201/0448 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 16, 2008
From: GAO, XIUJIE; SHOEMAKER, JAMES H.; ALEXANDER, PAUL W.; BROWNE, ALAN L.; JOHNSON, NANCY L.; MANKAME, NILESH D.; STAUFFER, LOUISE E.; VITALE, ROBERT L.; BAILEY, JACK L.
To: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Reel/Frame 020372/0418 →
Continuity (3)
Provisional Application 60887690 · Feb 1, 2007
Provisional Application 60863478 · Oct 30, 2006
Related Publication 20080100092A1 · May 1, 2008