Tremolo bridge apparatus

• US 6,015,945 A
• Filed: 12/23/1998
• Issued: 01/18/2000
• Est. Priority Date: 12/23/1998
• Status: Expired due to Term

• Current Assignee: Hipshot Products Incorporated
• Original Assignee: Hipshot Products Incorporated
• Inventors: Borisoff, David J.
• Primary Examiner(s): Nappi, Robert E.
• Assistant Examiner(s): HSIEH, SHIH YUNG
• Application Number:
  US09/220,881
• Time in Patent Office: 391 Days
• Field of Search: 84/313
• US Class Current: 84/313
• CPC Class Codes: G10D 3/153 Tremolo devices

Abstract

A bearing system for a floating bridge tremolo device where a bearing surface carried by the guitar and a rocker surface carried by the bridge cooperate to provide a smooth rolling action, the intersection of the bearing and rocker surfaces with an imaginary plane through a point of contact between the surfaces yielding a straight line in the case of the bearing surface and a smooth continuous curve in the case of the rocker surface, this configuration giving the result that resistance to rocking is minimized.

Claims

1. A bearing system for a tremolo bridge of a guitar, comprising:

a bearing surface mountable on a body of a guitar;

a rocker mountable on the tremolo bridge, said rocker defining a rocker surface contactable to and cooperating with said bearing surface to provide smooth movement of the tremolo bridge;

the bearing surface and the rocker surface being configured so that in an assembled bearing system on a guitar an imaginary plane intersecting the surfaces through a point of contact between them defines two lines having a point of contact at the intersections of the plane with the surfaces, the line defined by the intersection of the imaginary plane with the bearing surface being straight adjacent the point of contact and the line defined by the intersection of the imaginary plane with the rocker surface defining a continuous curve adjacent the point of contact, whereby a smooth rocking action with minimal resistance is facilitated.

2. The bearing system of claim 1, further comprising a confining surface portion adjacent the bearing surface configured for preventing the rocker from rolling off the bearing surface.

3. The bearing system of claim 1, wherein the line defined by the intersection of the imaginary place with the rocker surface is a circular arc.

4. The bearing system of claim 1, wherein the rocker surface is spherical.

5. The bearing system of claim 1, wherein the bearing surface is cylindrical.

6. The bearing system of claim 5, further comprising a further rocker surface spaced apart from the rocker surface, the two rocker surfaces cooperating with the bearing surface to stabilize the bridge so as to minimize translational movement of the bridge with respect to the bearing surface in a direction orthogonal to a pivot axis about which the rocker surfaces rotate with respect to the bearing surface.

7. The bearing system of claim 1, wherein contact between the bearing surface and the rocker element surface is a single point.

8. The bearing system of claim 1, wherein the bearing surface is carried by a bearing post.

9. The bearing system of claim 8, wherein the bearing post is adjustable in height with respect to the guitar body.

10. The bearing system of claim 9, wherein the post is threaded and received in a threaded receptacle in the guitar body, height adjustment being facilitated by rotating the post.

11. The bearing system of claim 10, wherein the bearing surface comprises a right circular cylinder.

12. The bearing system of claim 1, wherein said rocker further comprises a bearing insert received in a socket in the tremolo bridge.

13. A guitar tremolo bridge bearing system supporting a tremolo bridge, comprising:

a bearing surface carried by a guitar body, said bearing surface being configured such that the intersection of said bearing surface and at least one plane gives a line having a straight central portion intermediate two confinement portions which diverge from the straight central portion to define a valley shape having a flat bottom and confining sides;

a rocker in rolling contact with the bearing surface, the rocker defining a rocker surface in contact with said bearing surface, said surface being configured such that the intersection of the at least one plane with said surface defines a line which is continuous and curves smoothly, said rocker being carried by the tremolo bridge, the rocker cooperating with the bearing surface to provide a smooth rolling action in allowing the tremolo bridge to rock back and forth on the tremolo bridge bearing from a first neutral balance position.

14. A bridge bearing system according to claim 13, wherein said confinement portions are configured so that the bearing system will be self-adjusting regarding positioning of the rocker element surface and the bearing surface.

15. The bridge bearing system of claim 13, wherein the intersection of the imaginary plane and the rocker surface where rocker surface intersection with a plane defines a circular arc.

16. The bridge bearing system of claim 15, wherein the rocker surface is spherical.

17. The bridge bearing system of claim 13, wherein the bearing surface comprises a central cylindrical portion.

18. The bridge bearing system of claim 17 wherein the central cylindrical portion defines a right circular cylinder.

19. The bridge bearing system of claim 13, wherein the bearing surface is carried by a bearing post of adjustable height in relation to the guitar body.

20. The bridge bearing system of claim 19, wherein the bearing post further includes a threaded portion configured for threading into the guitar body.

21. The bridge bearing system of claim 20, wherein the bearing surface has an axis of symmetry and the bearing post has an axis of symmetry coaxial with that of the bearing surface, the central portion of the bearing surface comprising a right circular cylinder and the confinement portions bounding the central portion comprising frustoconical surfaces.

22. The bearing system of claim 17, comprising a further rocker surface cooperating with said rocker surface and the bearing surface to resist movement of the tremolo bridge in a direction orthogonal to the cylindrical axis of the bearing surface.

23. The bearing system of claim 13, wherein the rocker comprises an insert received in a socket defined by the tremolo bridge.

24. The bearing system of claim 13, wherein the contact between the bearing surface and the rocker surface comprises a discrete point.

25. A tremolo bridge support bearing system for a guitar, comprising:

a support post carried by a guitar, the support post further comprising a bearing seat surface segment having a longitudinal axis and a first end and a second end, the bearing seat segment further comprising a first frustoconical segment having a decreasing radius along the longitudinal axis in a direction from the first end of the bearing segment to the second end of the bearing segment, and a second frustoconical segment having an increasing radius along the longitudinal axis in a direction from the first end of the bearing segment to the second end of the bearing segment, and a right circular cylindrical segment intermediate the first and second frustoconical segments;

a rocker having a curved surface in contact with the bearing seat surface segment of the support post, the rocker being carried by the tremolo bridge and facilitating a smooth relative movement between the bridge and the guitar body to provide a tremolo effect.