Compound archery bow with extended inverted stroke

• US 7,578,289 B2
• Filed: 08/29/2006
• Issued: 08/25/2009
• Est. Priority Date: 08/30/2005
• Status: Expired due to Fees

• Current Assignee: Gregory Norkus
• Original Assignee: Gregory Norkus
• Inventors: Norkus, Gregory
• Primary Examiner(s): RICCI, JOHN A
• Application Number:
  US11/467,965
• Publication Number:
  US 20070044782A1
• Time in Patent Office: 1,092 Days
• Field of Search: 124/23.1, 124/24.1, 124/25, 124/25.6, 124/86, 124/88, 124/35.2
• US Class Current: 124/25.6
• CPC Class Codes: F41B 5/0094 Non-traditional bows, e.g. having hinged limbs or non-stave geometry
• CPC Class Codes: F41B 5/10 Compound bows compound crossbows F41B5/123
• CPC Class Codes: F41B 5/105 Cams or pulleys for compound bows
• CPC Class Codes: F41B 5/143 Arrow rests or guides
• CPC Class Codes: F41B 5/1469 Bow-string drawing or releasing devices F41B5/1473 takes precedence

Abstract

An inverted compound archery bow including an extended-capacity cam system having two cams, each cam engaging the bowstring and separate cables extending to limbs of the bow. The bowstring and cables are counter-wound on the cams, producing tension opposite and proportional to the inverse ratio of windings. Drawing the bowstring winds the cables onto the cams, producing limb tension that propels an arrow when the bowstring is released. An arrow rest located between full-draw and rest excursions of the bowstring accommodates the extended draw length of the bow. A bowstring arrestor engages the bowstring at an intermediate-draw position. A slide stabilizes and supports a rear portion of the bow, and a receptacle on the slide engages an adapter for a bowstring release mechanism.

Claims

1. A compound archery bow comprising:

a riser supporting a member for gripping the bow;

first and second limbs each extending in a forward direction from the riser to a distal end spaced apart from the riser;

pulley means disposed adjacent to the distal end of each limb;

a first cam and a second cam mounted with respect to the riser and rotatable on respective axes of rotation;

a bowstring extending between the pulley means on each limb so that the bowstring may be drawn on a path between a forward position and a rearward position;

one end of the bowstring extending from the pulley means on the first limb to the first cam, and another end of the bowstring extending from the pulley means on the second limb to the second cam;

a first cable extending from the first cam to the pulley means on the first limb, and thence extending to the second limb; and

a second cable extending from the second cam to the pulley means on the second limb, and thence extending to the first limb,

whereby drawing the bowstring toward the rearward position rotates the cams and thereby causes the cables to wind onto the cams and compress the limbs, producing limb tension that acts through the cams and pulley means to propel an arrow from the bow when the bowstring is released.

2. The compound archery bow as in claim 1, wherein:

the bowstring and the respective cables are counter wound on the respective cams so that the bowstring unwinds from the cams and winds the cables onto the cams as the bowstring is drawn, thereby placing the limbs in tension in response to drawing the bowstring.

3. The compound archery bow as in claim 1, wherein:

the first cable is attached onto the second limb; and

the second cable is attached onto the first limb,

so that the cables draw the respective distal ends of the limbs toward each other as the bowstring is drawn.

4. The compound archery bow as in claim 1, wherein:

each cam comprises a bowstring path from which the bowstring unwinds and thereby rotates the cam as the bowstring is drawn, and a cable path onto which the respective cable winds as the cam rotates in response to drawing the bowstring.

5. The compound archery bow as in claim 4, wherein the cable path comprises a helical path onto which the respective cable may wind for more than one revolution of the cam without overlap from successive revolutions.

6. The compound archery bow as in claim 4, wherein at least one of the bowstring path and the cable path has a radius that varies as a function of the angular position of the cam on the axis of the cam,

so that the draw-force required to draw the bowstring is modified along the draw-length of the bowstring in response to the variable radius of the at least one path of each cam.

7. The compound bow as in claim 4, wherein at least one of the bowstring path and the cable path comprise a groove deep enough to accept more than one layer of the respective bowstring or cable as the cam winds for more than one revolution.

8. The compound archery bow as in claim 1, further comprising:

an arrow rest for supporting an arrow nocked to the bowstring as the bowstring is drawn and before the bowstring is released to propel the arrow; and

the arrow rest being disposed between the forward position of the bowstring and a full-drawn position of the bowstring.

9. The compound archery bow as in claim 8, wherein:

the arrow rest is movable between a support position adjacent the path of the bowstring and an arrow so as to support the arrow before the bowstring is released, and a second position out of the path of the bowstring and the arrow when the bowstring is released for forward movement toward the arrow rest.

10. A compound archery bow comprising:

a riser;

limbs extending from the riser to distal ends;

a bowstring having at least a portion extending between the distal ends of the limbs so that the bowstring may be drawn along a path between a forward position at rest and a full-drawn position behind the forward position;

an arrow rest for supporting an arrow nocked to the bowstring as the bowstring is drawn and before the bowstring is released to propel the arrow, wherein the arrow rest is movable between a support position adjacent the path of the bowstring and an arrow so as to support the arrow before the bowstring is released, and a second position out of the path of the bowstring and the arrow when the bowstring is released for forward movement toward the arrow rest; and

the arrow rest being disposed between the forward position and the full-drawn position of the bowstring.

11. The compound archery bow as in claim 10, further comprising:

means biasing the arrow rest to the second position in response to forward movement of the arrow, whereupon the arrow rest moves to the second position out of the path of the arrow and the bowstring.

12. The compound archery bow as in claim 10, wherein:

the arrow rest moves between the support position and the second position on an axis of rotation laterally spaced apart from the path of the bowstring and the arrow, so as not to interfere with the forward movement of the bowstring or the arrow.

13. The compound archery bow as in claim 12, further comprising:

a mounting element extending from the riser to support the arrow rest at the axis of rotation, with the axis of rotation of the arrow rest being canted with respect to the riser so that the arrow rest rotates out of contact with the arrow and out of the path of the bowstring when the bowstring is released.

14. The compound archery bow as in claim 10, further comprising:

a bowstring arrestor associated with the riser for holding the bowstring at an intermediate position between the forward position and the full-drawn position; and

the bowstring arrestor being operative to disengage the bowstring and retract from the path of the bowstring in response to drawing the bowstring back from the intermediate position,

so that the retracted bowstring arrestor does not interfere with forward movement of the bowstring upon release of the bowstring.

15. The compound bow as in claim 14, wherein:

the bowstring arrestor is pivotably supported in relation to the riser for movement between an operative position proximate to the bowstring path and a retracted position;

the bowstring arrestor has a holding member that enters the path of the bowstring when the bowstring arrestor is at the operative position and is engaged by the bowstring at the intermediate position; and

further comprising

means urging the bowstring arrestor toward the retracted position, whereby upon drawing the bowstring back from the intermediate position the bowstring moves out of engagement with the holding member, allowing the bowstring arrestor to move to the retracted position.

16. A compound archery bow comprising:

a riser;

limbs extending from the riser to distal ends;

a bowstring having at least a portion extending between the distal ends of the limbs for drawing along a path between a forward position at rest and a full-drawn position behind the forward position;

a bowstring arrestor associated with the riser for holding the bowstring at an intermediate position between the forward position and the full-drawn position; and

an actuator, positioned on a slide rod of the riser, for automatically deploying the bowstring arrestor;

the bowstring arrestor being operative to disengage the bowstring and retract from the path of the bowstring in response to drawing the slide rod back from the intermediate position,

so that the retracted bowstring arrestor does not interfere with forward movement of the bowstring upon release of the bowstring.

17. The archery bow as in claim 16, wherein;

the bowstring arrestor is pivotably supported in relation to the riser for movement between an operative position proximate to the bowstring path and a retracted position;

the bowstring arrestor having a holding member that enters the path of the bowstring when the bowstring arrestor is at the operative position and is engaged by the bowstring at the intermediate position; and

the bowstring arrestor including a mechanism that pulls the bowstring arrestor toward the retracted position, whereby upon drawing the slide rod back from the intermediate position the bowstring moves out of engagement with the holding member, allowing the bowstring arrestor to move to the retracted position.

18. An archery bow, comprising:

a riser;

limbs extending from the riser;

a bowstring having at least a portion extending between the limbs for drawing along a path between a forward position at rest and a frill-drawn position behind the forward position;

a support member associated with the riser for selective rearward and forward movement laterally offset from the path of the bowstring;

an arm laterally extending from the support member for positioning behind the full-drawn position of the bowstring as the support member is moved rearwardly; and

the arm having a receptacle to receive and provide lateral support to a release mechanism that draws the bowstring to the full-drawn position while the arm and the support member move rearwardly with the release mechanism; and

an adapter engaging the release mechanism and having a tapered portion, wherein the receptacle of the arm having a taper complementary to the tapered portion of the adapter and engaging the adapter as the release mechanism draws the bowstring rearwardly, whereby the adapter maintains the release mechanism in spaced apart relation to the arm so as to prevent unintentional disengagement of the release mechanism from a slide mechanism.