Methods of deploying a cover utilizing active material and an external heat source

• US 8,109,318 B2
• Filed: 03/31/2008
• Issued: 02/07/2012
• Est. Priority Date: 09/18/2007
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Browne, Alan L., Johnson, Nancy L.
• Primary Examiner(s): PUROL, DAVID M
• Application Number:
  US12/059,861
• Publication Number:
  US 20090072575A1
• Time in Patent Office: 1,408 Days
• Field of Search: 160/370.22, 160/1, 160/7, 160/274, 160/310, 160/312, 160/317, 160/405, 296/97.8, 296/97.4
• US Class Current: 160/370.22
• CPC Class Codes: B60J 11/025 specially adapted for covering vehicle parts, e.g. for doors, windows or windscreens
• CPC Class Codes: B60J 11/08 for windows or windscreens antiglare equipment B60J3/00
• CPC Class Codes: B60J 3/002 External sun shield, e.g. awning or visor

Abstract

Methods of deploying and stowing a cover coupled to an actuator comprising active material, includes the steps of heating the material with an external heat source, so as to cause a change in physical property and deploying the cover due to the change, and preferably includes accelerating the heating of the material by focusing the energy of the source with a lens or prism, engaging the cover with an input device and retracting the cover upon input, releasing stored energy as a result of the change, or further deploying the cover by use of a ratcheting mechanism, use of a timer for delayed actuation, use of a sensor configured to determine a condition, such as an opened door or the presence of an occupant, interconnecting to a windshield wiper, immersing the actuator in a heated fluid, and conduction heating the actuator through contact with a heated panel.

Claims

1. A method of deploying a vehicular cover having an active material based actuator utilizing an external heat source spaced from the cover and actuator, said method comprising the steps of:

a. securing the cover relative to the source such that at least a portion of the actuator is thermally coupled to the source, said at least portion presenting a first temperature;

b. securing the cover relative to a space and/or surface;

c. heating said at least portion with the heat source, so as to achieve a second temperature and cause a change in a physical property of the actuator; and

d. deploying the cover as a result of the change when the second temperature is achieved, so as to modify the space and/or block access to the surface, wherein the actuator is communicatively coupled to at least one sensor and a controller cooperatively configured to selectively transmit data to the actuator, and step c) further includes the steps of autonomously deploying the cover only after receiving the data.

2. The method as claimed in claim 1, wherein the heat source is the sun, the actuator is exposed and thermally coupled to radiant heat energy provided thereby, and step a) further includes securing the cover relative to at least one glazing region defining an area of radiation transparency, so as to prevent the transmission of radiation through at least a portion of the area when deployed.

3. The method as claimed in claim 1, further comprising step:

e. autonomously occluding said at least portion from the heat source, so as to allow the actuator to cool to a third temperature less than the second whereat the change is reversed, and autonomously stowing the cover as a result of the reversal, when the third temperature is achieved.

4. A method of deploying a cover utilizing an external heat source spaced from the cover, wherein said cover is adapted for use with a vehicle presenting at least one glazing and defining an interior compartment, and includes an active-material based actuator communicatively coupled to the compartment, said method comprising the steps of:

a. securing the cover relative to the source such that the actuator is exposed and thermally coupled to the source, said actuator presenting a first temperature;

b. heating the actuator with the heat source, so as to achieve a second temperature whereat the actuator is caused to undergo a change in physical property;

c. autonomously sensing a condition status within the compartment and conveying the condition to the actuator; and

d. selectively deploying the cover as a result of the change, when the second temperature is achieved, based on the condition status.