Compound bow with high limb preload

• US 7,699,045 B1
• Filed: 04/30/2009
• Issued: 04/20/2010
• Est. Priority Date: 01/10/2008
• Status: Active Grant

• Current Assignee: Precision Shooting Equipment Incorporated
• Original Assignee: Precision Shooting Equipment Incorporated
• Inventors: Hansen, Kevin, Kronengold, David H., Rasor, Allen C.
• Primary Examiner(s): RICCI, JOHN A
• Application Number:
  US12/433,338
• Time in Patent Office: 355 Days
• Field of Search: 124/23.1, 124/25.6, 124/86, 124/88
• US Class Current: 124/25.6
• CPC Class Codes: F41B 5/10 Compound bows compound crossbows F41B5/123

Abstract

A compound archery bow having a riser and first and second limbs secured to and extending from opposite ends of the riser, each limb having an axle to support a wheel or cam; the limbs have a limb tip angle measured from an unstrung or unflexed limb position to a flexed position at brace height of at least 65° and preferably 75° or more. The bow has an axle-to-axle distance percentage change from an unstrung or unflexed condition to a brace condition of at least 20%. The limbs exhibit a limb tip angle percentage change from brace height to full draw condition of 25% or less of the total limb tip change from unflexed to full draw while the limb tip measured from an unstrung condition to a flexed condition at full draw is at least 80° and preferably 100° or more.

Claims

1. In a compound archery bow having a riser, first and second limbs secured to and extending from opposite ends of said riser, each limb having an axle to support a wheel or cam;

at least one cam mounted for rotation on the axle of one of said limbs, and a bowstring extending from said cam to a cam or wheel on an opposite limb, the improvement comprising;

said limbs having a limb tip angle measured from an unstrung or unflexed limb position to a flexed position at brace height of at least 65°

.

2. The compound archery bow of claim 1 wherein said limb tip angle is 75°

.

3. In a compound archery bow having a riser, first and second limbs secured to and extending from opposite ends of said riser, each limb having an axle to support a wheel or cam;

at least one cam mounted for rotation on the axle of one of said limbs, and a bowstring extending from said cam to a cam or wheel on an opposite limb, the improvement comprising;

said bow having an axle-to-axle distance percentage change from an unstrung or unflexed condition to a braced condition of at least 20%.

4. The compound archery bow of claim 3 wherein said percentage change is 25% to 26%.

5. In a compound archery bow having a riser, first and second limbs secured to and extending from opposite ends of said riser, each limb having an axle to support a wheel or cam;

at least one cam mounted for rotation on the axle of one of said limbs, and a bowstring extending from said cam to a cam or wheel on an opposite limb, the improvement comprising;

said limbs having a limb tip angle measured from an unstrung condition to a flexed condition at full draw of at least 80°

.

6. The compound archery bow of claim 5 wherein said limb tip angle is 100°

or more.