Plastic strand damper

• US 6,269,919 B1
• Filed: 06/08/1999
• Issued: 08/07/2001
• Est. Priority Date: 09/14/1998
• Status: Expired due to Term

• Current Assignee: Illinois Tool Works Inc.
• Original Assignee: Illinois Tool Works Inc.
• Inventors: Bivens, Steven L., Parker, Eric
• Primary Examiner(s): Schwartz, Christopher P.
• Assistant Examiner(s): BARTZ, CLIFFORD T
• Application Number:
  US09/328,134
• Time in Patent Office: 791 Days
• Field of Search: 188/266, 188/288, 188/301, 188/322.15, 267/64.15, 267/64.11, 267/113, 267/118, 267/120, 267/124, 267/128, 16/44, 16/66, 16/84
• US Class Current: 188/288
• CPC Class Codes: F16F 9/0218 Mono-tubular units F16F9/0227, F16F9/0236, F16F9/0245 take precedence
• CPC Class Codes: F16F 9/3207 Constructional features F16F9/34 - F16F9/50 take precedence; assembly or repair F16F9/3271
• CPC Class Codes: F16F 9/54 Arrangements for attachment grommet-type rubber mounting springs per se F16F1/3732; construction of cylinder ends F16F9/3242; attachments to vehicles B60G13/001, B60G15/00

Abstract

The damper includes a cylindrical housing with a cylindrical passageway formed therewithin. A piston traverses the cylindrical passageway. A strand element is integrally molded with the piston on a first end and integrally molded with an attachment element on a second end. The portion of the cylindrical passageway through which the piston traverses when the damper is in its retracted position has a reduced diameter.

Claims

1. A damper including:

a housing with a cylindrical passageway formed therewithin, further including an aperture in said housing leading to said cylindrical passageway;

a piston traversing said cylindrical passageway; and

a strand element including a first end and a second end, said first end integrally formed with said piston and said second end integrally formed with an attachment element, said strand element reciprocatingly passing through said aperture.

2. The damper of claim 1 wherein said strand element, said piston and said attachment element are integrally molded of a plastic.

3. The damper of claim 2 wherein said plastic is a nylon 6 plastic.

4. The damper of claim 3 further including a coil spring through which said strand element passes.

5. The damper of claim 4 wherein said coil spring includes a first end and a second end, said first end abutting said piston and said second end abutting an end of said cylindrical passageway.

6. The damper of claim 5 wherein said end of said cylindrical passageway abutted by said second end of said coil spring is proximate to said aperture.

7. A damper including:

a housing with a cylindrical passageway formed therewithin, further including an aperture in said housing leading to said cylindrical passageway;

a piston traversing said cylindrical passageway; and

a strand element including a first end and a second end, said first end integrally formed with said piston and said second end integrally formed with an attachment element, said strand element reciprocatingly passing through said aperture;

wherein said piston traverses a first portion of said cylindrical passageway when said strand element is in a relatively retracted position and said piston traverses a second portion of said cylindrical passageway when said strand element is in a relatively extended position, and wherein a diameter of said first portion of said cylindrical passageway is reduced from a diameter of said second portion of said cylindrical passageway.

8. The damper of claim 7 wherein said reduced diameter of said first portion of said cylindrical passageway frictionally engages said piston to minimize any initial jump of the damper.

9. The damper of claim 8 wherein a longitudinal axis of said housing passes through said aperture and wherein said aperture is formed proximate to said second portion of said cylindrical passageway.

10. The damper of claim 9 wherein said housing is formed by a first part and a second part, said first part joining said second part along a circumferential section of said housing.

11. The damper of claim 10 wherein said first part of said housing snap fits to said second part of said housing.