Crush sensor for use in a vehicle

• US 5,680,909 A
• Filed: 06/06/1995
• Issued: 10/28/1997
• Est. Priority Date: 06/06/1995
• Status: Expired due to Term

• Current Assignee: TRW Technar, Inc. (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: TRW Technar, Inc. (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: Lofy, John D.
• Primary Examiner(s): Culbreth, Eric D.
• Application Number:
  US08/467,765
• Time in Patent Office: 875 Days
• Field of Search: 280/735, 280/734, 180/274, 180/271, 200/61.41, 200/61.42, 200/61.43, 200/61.44, 200/61.73, 200/85 R, 200/511, 200/512
• US Class Current: 180/274
• CPC Class Codes: B60R 21/0136 responsive to actual contact with an obstacle , e.g. to vehicle deformation, bumper displacement or bumper velocity relative to the vehicle monitoring crash strength in combination with passenger seat detection B60R21/01558

Abstract

A crush sensor (10) includes a deformable first elongated member (20) having a width (W) and a length (L). A deformable second elongated member (30) has a width (W) and a length (L). The first and second members are parallel to each other and are closely spaced from one another. The first member includes an elongated contact surface (22) extending along its length. The second member includes an elongated contact surface (32) extending along its length and facing towards the elongated contact surface of the first member. The contact surface of at least one of the members includes a generally planar strip (34) and a raised electrically conductive rib (36) extending along its length and protruding from the strip toward the contact surface of the other member. The contact surfaces are normally electrically isolated from one another when the members are closely spaced from one another. The contact surfaces move into electrical contact with each other upon deformation of at least one of the first and second members.

Claims

1. A crush sensor for mounting on a vehicle door having a length for extending along forward and rearward directions of travel of the vehicle, said crush sensor comprising:

deformable first and second elongated members parallel to each other and closely spaced from one another; and

each of said members having an elongated contact surface which faces an elongated contact surface of the other member, the contact surface of at least one of said members including a generally planar strip having a raised electrically conductive rib extending along its length and protruding from said strip toward the elongated contact surface of the other member, said contact surfaces being normally electrically isolated from one another when said members are closely spaced from one another, said contact surfaces moving into electrical contact with each other upon deformation of at least one of said first and second members;

said contact surface of one of said members having a concave surface area, and said raised electrically conductive rib of the other one of said members having a convex surface area which faces said concave surface area of said contact surface of said one member;

said concave surface area having opposite outer edge portions which lie in a flat plane extending through said raised electrically conductive rib.

2. A crush sensor for mounting on a vehicle door having a length for extending along forward and rearward directions of travel of the vehicle, said crush sensor comprising:

deformable first and second elongated members parallel to each other and closely spaced from one another; and

each of said members having an elongated contact surface which faces an elongated contact surface of the other member, the contact surface of at least one of said members including a generally planar strip having a raised electrically conductive rib extending along its length and protruding from said strip toward the elongated contact surface of the other member, said contact surfaces being normally electrically isolated from one another when said members are closely spaced from one another, said raised electrically conductive rib on the at least one member and the contact surface on the other member moving into electrical contact with each other upon deformation of at least one of said first and second members.

3. A crush sensor according to claim 2 further comprising first mounting means for mounting said members to the vehicle door.

4. A crush sensor according to claim 3 wherein said first mounting means includes means disposed only at opposite ends of said members and for fixedly mounting said members to the vehicle door.

5. A crush sensor according to claim 3 further comprising second mounting means for mounting said first and second members relative to each other.

6. A crush sensor according to claim 5 wherein said second mounting means includes means disposed between said contact surfaces of said members along at least a portion of said members and for spacing said contact surfaces apart from each other when said contact surfaces are normally electrically isolated.

7. A crush sensor according to claim 5 wherein said second mounting means includes a number of insulated spacers spaced apart along at least a portion of said members and disposed between said contact surfaces of said members.

8. A crush sensor according to claim 2 wherein each of said members comprises electrically conductive metallic material.

9. A crush sensor according to claim 8 wherein said electrically conductive metallic material includes plated low carbon steel.

10. A crush sensor according to claim 2 wherein said contact surface of one of said members has a concave surface area, and said raised electrically conductive rib of said at least one of said members has a convex surface area which faces said concave surface area of said contact surface of said other member.

11. A crush sensor according to claim 2 wherein the length of each of said members is more than 50 percent of the length of the vehicle door in the forward and rearward directions of travel of the vehicle.

12. A crush sensor according to claim 11 wherein the length of each said members is approximately 85 percent of the length of the vehicle door in the forward and rearward directions of travel of the vehicle.

13. A crush sensor according to claim 2 further comprising an elongated plastic sleeve which acts as an environmental barrier and in which said members are disposed to prevent foreign objects from accidently shorting said members.