Outside back angle canted coil spring

• US 4,915,366 A
• Filed: 09/18/1989
• Issued: 04/10/1990
• Est. Priority Date: 04/25/1988
• Status: Expired due to Term

• Current Assignee: Bal Seal Engineering Incorporated (Kaman Corporation)
• Original Assignee: Joan C. Balsells, Peter J. Balsells
• Inventors: Balsells, Peter J.
• Primary Examiner(s): Oberleitner, Robert J.
• Application Number:
  US07/408,686
• Time in Patent Office: 204 Days
• Field of Search: 267/166, 267/166.1, 267/167, 267/180, 267/182, 267/1.5, 267/286, 188/322.16, 188/322.17, 277/153, 277/163, 277/164, 277/205, 277/235 R
• US Class Current: 267/167
• CPC Class Codes: F16F 1/045 Canted-coil springs
• CPC Class Codes: F16J 15/3212 with metal springs

Abstract

A garter-type axially resilient coil spring includes a plurality of coils canted along a centerline thereof with each coil having a trailing portion and a leading portion. Specific resilient performance, or load-deflection characteristics, of the spring is obtained by interconnecting the coils in a manner such that the trailing portion is disposed along an outside diameter of the garter-type axially resilient coil spring and the leading portion is disposed along an inside diameter of the garter-type axially resilient coil spring.

Claims

1. A garter-type axially resilient coiled spring comprising:

a plurality of coils canted in a counterclockwise direction along a centerline thereof;

back angle means for both defining the disposition of a trailing portion of each coil with respect to a line normal to the centerline and for determining the force-deflection characteristics of the garter-type axially resilient coiled spring, said back angle means being less than 25 degrees;

front angle means for defining the disposition of a leading portion of each coil with respect to the normal line, said front angle means being greater than said back angle means;

said coils being interconnected in a manner forming a garter-type axially resilient coiled spring with the trailing portion along an outside diameter of the garter-type axially resilient coiled spring and the leading portion along an inside diameter of the garter-type axially resilient coiled spring.

2. The garter-type axially resilient coiled spring according to claim 1 wherein the front angle is greater than 15 degrees and less than 55 degrees.

3. The garter-type axially resilient coiled spring according to claim 2 wherein the back angle means defines a working deflection in which the garter-type axially resilient coiled spring exerts a generally constant force in an axial direction in response to deflection of the garter-type axially resilient coiled spring in the axially direction, said working deflection being between about 5 percent and about 50 percent deflection of the garter-type axially resilient coiled spring.

4. The garter-type axially resilient coiled spring according to claim 3 wherein the front angle is less than 35 degrees.

5. A garter-type axially resilient coiled spring comprising:

a plurality of coils canted in a counterclockwise direction along a centerline thereof;

back angle means for both defining the disposition of a trailing portion of each coil with respect to a line normal to the centerline and for causing the coiled spring to exert a force in a loading direction approximately normal to the plane of the centerline in response to deflection of the coiled spring along said loading direction, said force being generally constant over a preselected range of deflection of the garter-type axially resilient coiled spring along the loading direction, said back angle means being less than 25 degrees;

front angle means for defining the disposition of a leading portion of each coil with respect to the normal line, said front angle means being greater than said back angle means;

said coils being interconnected in a manner forming a garter-type axially resilient coiled spring with the trailing portion along an outside diameter of the garter-type axially resilient coiled spring and the leading portion along an inside diameter of the garter-type axially resilient coiled spring.