Harmonic damper for handheld instruments

• US 7,264,098 B2
• Filed: 06/18/2004
• Issued: 09/04/2007
• Est. Priority Date: 06/18/2004
• Status: Active Grant

• Current Assignee: MCP IP, LLC
• Original Assignee: Mathew A. McPherson
• Inventors: McPherson, Mathew A.
• Primary Examiner(s): KING, BRADLEY T
• Application Number:
  US10/871,213
• Publication Number:
  US 20050279599A1
• Time in Patent Office: 1,173 Days
• Field of Search: 188/378, 188/379, 188/380, 267/136, 267/137, 473/520, 473/521, 473/523, 81/22
• US Class Current: 188/379
• CPC Class Codes: A63B 60/54 with means for damping vibrations
• CPC Class Codes: F16F 7/108 on plastics springs

Abstract

A damper for reducing vibrations in a handheld device, tool and/or instrument may comprise a resilient member and a weight. The resilient member may mounted to any portion of a device having a surface suitable for engaging and retaining the resilient member therein, and the resilient member may have an inside surface suitable for engaging and retaining the weight. In some embodiments, additional resilient members may be arranged to engage and retain the weight.

Claims

1. A vibration damper for a handheld device comprising:

a weight;

a first resilient member having an inside surface suitable for engaging and retaining a portion of the weight, the first resilient member comprising a first end, a second end and an annular channel having a U-shaped cross-section, a top of the U-shape located at the first end and a bottom of the U-shape located at the second end; and

a second resilient member having an inside surface suitable for engaging and retaining a portion of the weight, the second resilient member comprising an annular channel having a U-shaped cross-section;

wherein the first resilient member is mounted to a portion of a handheld device having a surface suitable for engaging and retaining the first resilient member therein, the second resilient member is mounted to a portion of the handheld device having a surface suitable for engaging and retaining the second resilient member therein, and the annular channel of the first resilient member comprises a mirror image of the annular channel of the second resilient member.

2. The vibration damper of claim 1, wherein the handheld device includes a handle, and the damper is mounted to the handle.

3. The vibration damper of claim 2, wherein the damper is mounted within the handle.

4. The vibration damper of claim 3, wherein the damper is hidden from view.

5. The vibration damper of claim 1, wherein the resilient member comprises a cylindrical shape having a central axis, and the central axis of the resilient member is centered upon a longitudinal axis of a tubular portion of the handheld device.

6. The vibration damper of claim 1, wherein an outer surface of at least one resilient member includes a raised engagement flange for frictionally engaging the handheld device.

7. The vibration damper of claim 1, wherein at least a portion of the weight is made of tungsten.

8. The vibration damper of claim 1, wherein the weight is entirely supported by the first resilient member and the second resilient member.

9. The vibration damper of claim 1, wherein the inside surface of the first resilient member includes a first internal flange, the inside surface of the second resilient member includes a second internal flange, and the weight includes a first recess arranged to mate with said first internal flange and a second recess arranged to mate with said second internal flange.

10. The vibration damper of claim 1, wherein the first resilient member comprises an annular shape having a central axis, the second resilient member comprises an annular shape having a central axis, and the weight comprises a cylindrical shape having a longitudinal axis;

wherein the central axes of the first and second resilient members are centered upon the longitudinal axis of the weight.

11. The vibration damper of claim 1, wherein the first resilient member includes a mounting flange arranged to abut the portion of the handheld device engaging and retaining the first resilient member.

12. The vibration damper of claim 11, wherein the damper is mounted within a portion of a handle, the mounting flange of the first resilient member abutting an end of the handle.

13. The vibration damper of claim 1, wherein the first and second resilient members bias the weight toward a nominal position, wherein the weight has a longitudinal axis, and wherein the weight may displace with respect to the first damper in directions orthogonal to the longitudinal axis of the weight.

14. The vibration damper of claim 13, wherein the weight may also displace with respect to the first damper in directions parallel to the longitudinal axis of the weight.

15. The vibration damper of claim 1, further comprising a third resilient member having an inside surface suitable for engaging and retaining a portion of the weight, the third resilient member mounted to a portion of a handheld device having a surface suitable for engaging and retaining the third resilient member therein.

16. The vibration damper of claim 15, wherein the first, second and third resilient members are equally spaced along the length of the weight.

17. The vibration damper of claim 1, wherein the handheld device comprises a striking device.

18. The vibration damper of claim 1, wherein the handheld device is selected from a group consisting of baseball bats, cricket bats, golf clubs, hockey sticks, tennis rackets, squash rackets, racquetball rackets, badminton rackets, table tennis paddles, croquet mallets, polo sticks, lacrosse sticks, oars, pool cues, nightsticks, hammers, axes, picks, saws, files, rasps, punches, chisels and ratchets.

19. An excursion damper comprising:

a weight having a first end and a second end;

a first resilient member having an inside surface suitable for engaging and retaining a portion of the weight; and

a second resilient member having an inside surface suitable for engaging and retaining a portion of the weight;

each resilient member further comprising a first end, a second end and an annular channel having a U-shaped cross-section, a top of the U-shape located at the first end of the resilient member and a bottom of the U-shape located at the second end of the resilient member, the annular channel of the first resilient member being oriented in the opposite direction of the annular channel of the second resilient member;

wherein the first resilient member is mounted to a portion of a handheld device having a surface suitable for engaging and retaining the first resilient member therein;

the second resilient member is mounted to a portion of the handheld device having a surface suitable for engaging and retaining the second resilient member therein;

the first and second resilient members arranged to bias the weight to a nominal position and to temporarily allow the weight to displace in three orthogonal directions with respect to the portion of the handheld device engaging the first resilient member.

20. The excursion damper of claim 19, wherein the second end of the first resilient member extends past the first end of the weight.

21. The excursion damper of claim 19, further comprising a third resilient member having an inside surface suitable for engaging and retaining a portion of the weight, the third resilient member mounted to a portion of the handheld device having a surface suitable for engaging and retaining the third resilient member therein.

22. The excursion damper of claim 21, further comprising a fourth resilient member having an inside surface suitable for engaging and retaining a portion of the weight, the fourth resilient member mounted to a portion of the handheld device having a surface suitable for engaging and retaining the fourth resilient member therein.

23. The excursion damper of claim 20, wherein the second end of the second resilient member extends past the second end of the weight.

24. The excursion damper of claim 19, wherein the handheld device is selected from a group consisting of baseball bats, cricket bats, golf clubs, hockey sticks, tennis rackets, squash rackets, racquetball rackets, badminton rackets, table tennis paddles, croquet mallets, polo sticks, lacrosse sticks, oars, pool cues, nightsticks, hammers, axes, picks, saws, files, rasps, punches, chisels and ratchets.