Archery Release Device with Bowtie Cam
A triggerless back tension archery release device to assist archers in pulling a bow string to a fully drawn position and then releasing the bow string to fire an arrow. The surprise release timing is dependent upon a bowtie cam which is a bowtie shaped member containing various size corner edge notches. The bowtie cam may be rotated and then fixed at the desired orientation for pulling the arrow to the fully drawn position. The depth of the notch in the bowtie cam determines the surprise release timing. The bowtie cam is designed with a notch on each of the four corners. The bowtie cam may be reoriented to place any one of the four corner edge notches in the active position thus providing various degrees of flexibility for the surprise release timing.
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This application claims the benefit under 35 U.S.C. §119(e) of U.S. Provisional Patent Application No. 61/294,884, filed Jan. 14, 2010, and titled “Back Tension Archery Release Device with Bowtie Cam” which is incorporated herein by reference.
FIELD OF THE INVENTIONThis invention relates to a triggerless back tension archery release device for use with a bow string and more specifically, a four position bowtie cam in a triggerless back tension release device.
BACKGROUND OF THE INVENTIONA back tension release device is one of several types of archery aids used by archers to assist in pulling a bow string to a fully drawn position and then releasing the bow string to fire the arrow. Nervousness and tension during the shooting motion, and the anticipated release of the bow string, can result in a temporary loss of control, flinching, or an uncontrollable reflex movement, known as target panic, which can result in the arrow missing its target. Target panic is the inability of an archer to accurately aim and execute a controlled shot at the precise instant he/she intends to shoot.
A back tension release device allows for a surprise shot, thus eliminating the negative effects of target panic and improving shot consistency. When the exact timing of a shot is controlled by an archer, there is a higher probability of an inaccurate shot. A back tension device produces a surprise shot in which the exact timing of the release of the arrow is not controlled or known to the archer. The arrow release is initiated after the bow string is pulled to a fully drawn position by the rotation of the back tension device in the archer's hand. A slight increase in the tension at full draw coupled with a slight rotation of the archery release will cause the back tension device to release the string.
Existing back tension release devices can contain a half moon or D-shape cam that can be adjusted to regulate the timing of the release. A clicker half moon or D-shape cam has a notch machined into the shooting edge of the cam. The notch causes an audible click which notifies the archer that the release is ready to fire, thus providing a reference before the arrow is released. This allows the archer to advance his/her draw immediately to the click and then settle into his/her shot routine for a surprise release. The timing from the click to the release can be changed by using a cam with a different depth notch and the amount of travel to reach the click is adjusted by rotating the cam.
The standard half moon or D-shape cam design has two locations where notches can be machined. A new cam design is desired in which a greater number of notches can be machined to provide greater timing flexibility in a back tension release device while maintaining the ability to rotate the cam to adjust the amount of travel to reach the click.
SUMMARY OF THE INVENTIONThe present invention is a triggerless back tension archery release aid system containing a novel bowtie cam which provides archers with an option of four surprise release times. The bowstring release aid is held in the hand of the archer and is used to draw back the bowstring. The bowstring release aid is shaped and fitted to accommodate the fingers on the hand while gripping the release. The bowstring is attached to the bowstring release aid with a sear hook which rotates and releases the bowstring upon proper force and angle.
The surprise release time may be changed by the adjustment of the bowtie cam. The orientation of the bowtie cam may be selected by the archer, thus positioning the desired corner notch in the active position for the surprise release. The unique geometry of the bowtie cam allows for the archer to select any one of the four possible corner notches for the surprise release, in addition to rotating the cam for pull back adjustment.
Understanding that drawings depict only certain preferred embodiments of the invention and are therefore not to be considered limiting of its scope, the preferred embodiments will be described and explained with additional specificity and detail through the use of the accompanying drawings in which:
In the following description, numerous specific details are provided for a thorough understanding of specific preferred embodiments. However, those skilled in the art will recognize that embodiments can be practiced without one or more of the specific details, or with other methods, components, materials, etc. In some cases, well-known structures, materials, or operations are not shown or described in detail in order to avoid obscuring aspects of the preferred embodiments. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in a variety of alternative embodiments. Thus, the following more detailed description of the embodiments of the present invention, as represented in the drawings, is not intended to limit the scope of the invention, but is merely representative of the various embodiments of the invention.
The triggerless back tension release device 10, shown in
The bowtie cam 17, shown in
The bowtie cam 17 is held in place by the bowtie pin 18 passing through the center of the bowtie cam 17, the stem 12, and the linkage member 19. The bowtie pin 18 allows the bowtie cam 17 to be rotated by the archer to a desired position or orientation relative to the stem 12, thus providing pull back adjustment for initiating the release. A screw or fastening mechanism (not shown) is tightened against the curved adjustment surface 29 of the bowtie cam 17 to secure it in place and keep it from rotating during a shot.
Without further elaboration, it is believed that one skilled in the art can use the preceding description to utilize the invention to its fullest extent. Therefore the examples and embodiments disclosed herein are to be construed as merely illustrative and not a limitation of the scope. It will be obvious to those skilled in the art that many changes may be made to the details of the above described embodiments without departing from the underlying principles of the invention.
Claims
1. A triggerless back tension archery release device comprising:
- a finger grip handle including at least two finger grooves;
- a stem attached to and extending away from said handle;
- a bowtie shaped bowtie cam with a through hole in the center;
- a linkage member;
- a bowtie pin passing through said hole in said bowtie cam to fasten said bowtie cam to said stem and said linkage member; and
- a sear having a bow string hook on one end and fastened to said linkage member with a sear pin, wherein increasing the tension on the bow string causes the rotation of said sear relative to said bowtie cam resulting in the bow string being released.
2. The device of claim 1 wherein said bowtie cam has two curved side segments, two curved sliding surfaces, and a notch in at least one corner edge.
3. The device of claim 2 wherein said bowtie cam can be re-oriented in said triggerless back tension archery release device to put a different said corner edge in the active position.
4. The device of claim 2 wherein the center regions of said curved side segments are concentric with said hole and have a radius greater than the radius of said hole.
5. The device of claim 4 wherein said sliding surfaces are concentric with said hole and have a radius greater than said radius of said curved side segments.
6. The device of claim 3 wherein said notches in said bowtie cam are different sizes.
7. The device of claim 3 wherein two said notches in said bowtie cam are equal sizes.
8. The device of claim 3 wherein three said notches in said bowtie cam are equal sizes.
9. The device of claim 3 wherein four said notches in said bowtie cam are equal sizes.
10. A cam for a triggerless back tension archery release device comprising:
- a component in the shape of a bowtie with a through hole in the center; two curved side segments; two curved sliding surfaces; and a notch in at least one corner edge.
11. The cam of claim 10 wherein said curved side segments are on opposite sides of said hole and the center regions of said curved side segments are concentric with said hole and have a radius greater than the radius of said hole.
12. The cam of claim 11 wherein said sliding surfaces are on opposite sides of said hole and are concentric with said hole and have a radius greater than said radius of said curved side segments.
13. The cam of claim 10 wherein said notches are different sizes.
14. The cam of claim 10 wherein two said notches are equal sizes.
15. The cam of claim 10 wherein three said notches are equal sizes.
16. The cam of claim 10 wherein four said notches are equal sizes.
Type: Application
Filed: Jan 13, 2011
Publication Date: Jul 14, 2011
Applicant: Utah State University (North Logan, UT)
Inventor: Andrew Deceuster (Logan, UT)
Application Number: 13/006,267
International Classification: F41B 5/18 (20060101);