# US 2013/0152911 A1 · Two-track system for dual cam compound bow

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- Number: US 2013/0152911 A1
- Document ID: US20130152911A1
- Status: Published application
- Kind: A1
- Application number: 13/751,809
- Filed: 2013-01-28
- Published: 2013-06-20
- Earliest claimed: 2008-01-25
- Assignees: Perfect Form Manufacturing LLC
- Inventors: Kevin D. Strother
- Web page: https://patentgrep.com/patent/US20130152911A1

## CPC

- F41B 5/105: {Cams or pulleys for compound bows}
- F41B 5/10: Compound bows {(compound crossbows F41B5/123)}
- F41B 5/14: Details of bows; Accessories for arc shooting (sighting devices for bows F41G1/467)
- F41B 5/1411: {Bow-strings}
- Y10S 124/90: Limb tip rotatable element structure
- F41B: WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR (projectiles for fishing, e.g. fish-spears, A01K81/00; sports implements for throwing A63B65/00, e.g. boomerangs A63B65/08; stationary apparatus for projecting sports balls, e.g. tennis balls, A63B69/40; throwing or slinging toys A63H33/18; knives, axes B26B; projectiles or missiles other than those incorporating springs as projecting means F42B6/00)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

The present invention comprises a two-track cam assembly wherein the cam assembly has a bowstring component for housing the bowstring and a power cable component that allows for the take up and let out of the power cable on opposing ends of the power cable component, effectively creating a two-track cam assembly. The efficiency rating of the device achieves 95.8%. The cam assembly can come in a unitary or modular form and further each component (i.e. the bowstring or power cable component) can be in a circular or non-circular form.

## Claims

### Claim 1

A cam assembly for use in a compound bow, the cam assembly comprising:
a bowstring assembly comprising a bowstring track for receiving a bowstring;
a power cable assembly comprising a power cable track comprising
a take-up portion for receiving a first power cable;
a let-out portion for receiving a second power cable;
wherein the power cable track, the take-up portion and the let-out portion are substantially coplanar; and
a fastening mechanism for releasably attaching the power cable assembly to the bowstring assembly.

### Claim 2 (depends on 1)

The cam assembly of claim 1, further comprising a slotted opening.

### Claim 3 (depends on 2)

The cam assembly of claim 2, wherein the slotted opening is in the bowstring assembly.

### Claim 4 (depends on 2)

The cam assembly of claim 2, further comprising a draw-stop pin.

### Claim 5 (depends on 4)

The cam assembly of claim 4, wherein the draw-stop pin extends through the slotted opening.

### Claim 6 (depends on 1)

The cam assembly of claim 1, wherein the power cable track is contiguous from the take-up portion to the let-out portion.

### Claim 7 (depends on 1)

The cam assembly of claim 1, wherein the power cable track has a curved portion that contiguously connects the take-up portion to the let-out portion.

### Claim 8 (depends on 4)

The cam assembly of claim 4, wherein the draw-stop pin is attached to the power cable assembly.

### Claim 9 (depends on 1)

The cam assembly of claim 1, wherein the power cable assembly is sized and shaped to change operating parameters, including a draw length parameter, of the compound bow, and is designed to be interchanged with a different power cable assembly being of a different size and shape to change the operating parameters of the compound bow.

### Claim 10

A compound bow comprising:
a first limb portion, a second limb portion and a handle between the first limb portion and the second limb portion;
a first cam assembly attached to the first limb portion, the first cam assembly comprising:
a bowstring assembly comprising a bowstring track for receiving a bowstring;
a power cable assembly comprising a power cable track comprising
a take-up portion for receiving a first power cable;
a let-out portion for receiving a second power cable;
the power cable track, the take-up portion and the let-out portion being substantially coplanar;
a fastening mechanism for releasably attaching the bowstring assembly to the power cable assembly;
a slotted opening;
a draw-stop pin extending through the slotted opening of the bowstring assembly; and
a second cam assembly attached to the second limb portion.

### Claim 11 (depends on 10)

The compound bow of claim 10, wherein the slotted opening is in the bowstring assembly.

### Claim 12 (depends on 10)

The compound bow of claim 10, wherein the power cable track is contiguous from the take-up portion to the let-out portion.

### Claim 13 (depends on 10)

The compound bow of claim 10, wherein the power cable track has a curved portion that contiguously connects the take-up portion to the let-out portion.

### Claim 14 (depends on 10)

The compound bow of claim 10, wherein the draw-stop pin is attached to the power cable assembly.

### Claim 15 (depends on 10)

The compound bow of claim 10, wherein the power cable assembly is sized and shaped to change operating parameters, including a draw length parameter, of the compound bow, and is designed to be interchanged with a different power cable assembly being of a different size and shape to change the operating parameters of the compound bow.