Magnetic bowstring release and method
A trigger acting upon a lever pivotally attached to a body urges the lever to overcome a magnetic force attracting the lever to a segment of the body and to pivot from a first position to a second position, which trigger is not positionally moved until the magnetic force is overcome. A jaw has a first position for retaining a bowstring and is maintained in the first position by the lever being in the first position. When the lever pivots to the second position, the jaw under influence of a force imposed by the bowstring pivots to a second position and releases the bowstring. A further pair of magnets may be used to create an opposing magnetic force to further urge maintenance of the lever in the first position.
The present application is related to and claims priority of a provisional application entitled “MAGNETIC ARCHERY RELEASE”, filed Sep. 2, 2004, and assigned Ser. No. 60/607,137, disclosing an invention by the present inventor.
BACKGROUND OF THE INVENTION1. Field of the Invention
The present invention relates to bowstring releases and, more particularly, to a magnetic bowstring release.
2. Description of Related Prior Art
Mechanical archery bowstring releases have become increasingly popular in recent years because they provide more uniform control of a bowstring and increase accuracy by effecting a consistent, controlled release of an arrow over that of a manual release. Bowstring releases are typically used to maintain the bowstring in a cocked position in which the bowstring is flexed against the tension of the bow for propelling the arrow supported on the bowstring. When a drawn arrow is released from a release mechanism, the release of the bowstring is usually relatively rapid and at a point approximately in line with the centerline of the bow so that the bowstring delivers most of its thrust directly along the major axis of the arrow. When tabs or fingers are used to release a bowstring, the bowstring tends to roll off the fingers or tab and be deflected sideways during release. The bowstring then tends to follow a serpentine path and fails to maximize the energy delivery directly along the major axis of the arrow.
The majority of the bowstring releases have a body or casing which houses the sear and trigger mechanisms. The body is typically a cylindrical or rectangular configuration with the pivotable jaws of the sear mechanism positioned at one end and a trigger located along the length of the body. The jaws and trigger of the bowstring release are traditionally secured to the body with linkages or pins, which serve as pivot mechanisms for the jaws and trigger.
It has been found that many commercial bowstring releases load up severely as the pulling force on the bowstring is increased. Loading up is a phenomenon whereby the force required of the archer to pull the trigger and release the bowstring increases as the effective draw weight of the bow increases. Thus, at higher effective draw weights, the archer must pull harder on the trigger, perhaps causing a decrease in sensitivity and performance. A harder trigger pull may also cause a jerking trigger release motion, causing erratic arrow flight.
There are two commonly used trigger sensitivity adjustment mechanisms. In one mechanism, the depth of engagement of sear elements is varied. This affects trigger pull length, also known as trigger travel distance, and indirectly affects the pull force required by making the trigger travel farther to disengage the sear, which in turn increases the sliding friction. Another mechanism is a single roller on one of a pair of sear elements. The roller is used to reduce friction between the sear elements. Adjustment is related to positioning the roller's center in relation to the edge of an angled slot in the trigger.
SUMMARY OF THE INVENTIONA lever supporting a trigger of a magnetic release is magnetically biased to maintain a pivotally mounted jaw in engagement with a bowstring. To effect a release of the bowstring, pressure is applied to the trigger, which trigger does not move until the applied force overcomes a magnetic force acting upon the lever. Until the magnetic force between the lever and the magnet is overcome, there is no movement of the trigger and the archer may terminate actuation of the trigger without any detrimental result. The body of the magnetic release may be either attached to the archer's wrist by a wrist strap to permit engaging the body with one's thumb and leaving the forefinger free to actuate the trigger. In a second embodiment, the mechanism may be retained by the archer's fingers and the trigger may be actuated by the archer's thumb. In variants of the invention, the magnet may be positionally adjusted to vary the degree of magnetic force exerted. In other variants, the number of magnets may be increased, including the use of a pair of opposing magnets to restrain movement of the lever, to provide various levels of control over the degree of force that must be applied to pivotally move the lever.
It is therefore a primary object of the present invention to provide a magnetic force to control a mechanism for releasing a bowstring.
Another object of the present invention is to provide a magnetically actuated bowstring release attached to a user's wrist with a wrist strap to provide the force necessary to draw the bowstring.
Still another object of the present invention is to provide a magnetically actuated bowstring release held by the fingers of an archer.
Yet another object of the present invention is to provide a pivotable lever magnetically attracted to the body of the bowstring release to disengage a pivotable bowstring retaining jaw when the magnetic force acting upon the lever is overcome by a force exerted on a trigger.
A further object of the present invention is to provide a magnetically actuated release for a bowstring that includes a trigger which does not move until the force applied to the trigger overcomes a magnetic force retaining a lever supporting the trigger.
A yet further object of the present invention is to provide a magnetically actuated release for a bowstring having magnets positionally adjustable to provide a selected magnetic force.
A still further object of the present invention is to provide a magnetically actuated bowstring release that includes a plurality of magnets operating in concert to provide a selectable magnetic force that must be overcome to trigger release of the bowstring.
A still further object of the present invention is to provide a method for releasing a bowstring with a magnetic release.
These and other objects of the present invention will become apparent to those skilled in the art as the description thereof proceeds.
BRIEF DESCRIPTION OF THE DRAWINGSThe present invention will be described with greater specificity and clarity with reference to the following drawings, in which:
Referring jointly to
Lever 36 is retained in the position shown in
In the closed position of jaw 20, as illustrated in
To vary the magnetic force exerted by magnet 28 upon lever 36, the magnet may be rotated from one of the poles bearing against the lever in the closed position shown in
As partially illustrated in
To reset magnetic release 10, jaw 20 is opened, as depicted in
An indentation 120 is formed in jaw 108 to receive and mate with end 122 of lever 102. Upon placement of end 122 within indentation 120, as illustrated, counterclockwise rotation of jaw 108 is precluded due to the interference between the indentation and the end of the lever. That is, when jaw 108 has captured a bowstring, the force exerted by the bowstring will tend to cause the jaw to rotate a about pin 118 in a counterclockwise direction. Such rotation is precluded by end 122 of the lever. The lever is magnetically retained in the position illustrated in
To release the bowstring from within jaw 108, a user would push upon end 126 of trigger 100. No movement of the lever occurs until this pushing force is sufficient to overcome the magnetic force of magnet 124 acting upon lever 102. When the magnetic force is exceeded, pivotal movement of the lever in the counterclockwise direction, as represented by arrow 127, would occur and the lever would move under the force exerted upon end 126 until the lever abuts against surface 128 of body 92. Thus, this surface limits the degree of counterclockwise movement of the lever. When the lever is rotated counterclockwise, end 122 will become disengaged from indentation 120. Upon such disengagement, the force exerted by bowstring 111 captured in slot 110 of jaw 108 will cause the jaw to rotate counterclockwise about pin 118. Upon sufficient rotation of the jaw to clear slot 114, bowstring 111 will be released.
Referring to
Resistance to pivotal movement of lever 160 may be accomplished as follows. A magnet 170 is mounted in body 92 in proximity with a magnet 172 mounted in trigger 150. The magnetic attraction between these two magnets will resist pivotal movement of trigger 150 about pin 156. A magnet 174 may be mounted on lever 152 on a side of pin 156 opposite from trigger 150 to urge counterclockwise movement of the lever as a result of the magnetic force between the magnet and body 92. Jaw 108 may include a magnet 176 magnetically cooperating with a magnet 178 mounted adjacent thereto at the upper end of lever 160. These two magnets will cooperate to magnetically retain the upper end of lever 160 within indentation 122 of the jaw.
In operation, movement of trigger 150 will not occur until a sufficient force is exerted at end 158 of the trigger to overcome the magnetic force between magnets 170 and 172, between the magnetic force of magnet 174 acting upon body 92 and the magnetic force between magnets 176, 178. When the sum of these forces is overcome, lever 152 will be caused to pivot clockwise by trigger 150. Such pivotal movement will result in end 164 of lever 152 bearing against end 166 of lever 160 to cause lever 160 to rotate in a counterclockwise direction. Upon such rotation of lever 160, end 122 will disengage from indentation 120. Upon such disengagement, the force exerted by bowstring 111 will no longer be restrained by jaw 108 and the jaw will pivot counterclockwise to release the bowstring.
The force exerted by bowstring 200 will tend to cause jaw 194 to rotate clockwise. Such rotation is resisted by element 188 in mechanical engagement therewith and is enhance by magnet 202. By twisting body 182 clockwise, end 204 of element 188 will move out of engagement with indentation 202 to release jaw 194. Upon such release, the jaw will rotate clockwise under force of bowstring 200 until the bowstring clears the end of the jaw. Thus, the second variant magnetic release shown in
Claims
1. A magnetic release for a bowstring, said release comprising in combination:
- a) a body;
- b) a jaw pivotally supported on said body, said jaw having a first position for capturing the bowstring and a second position for releasing the bowstring;
- c) a lever pivotally supported on said body having a first position for retaining said jaw in the first position and having a second position for accommodating movement of said jaw to the second position;
- d) a magnet for providing a magnetic force to magnetically retain said lever in the first position; and
- e) a trigger acting upon said lever for urging said lever from its first position to its second position to permit release of the bowstring.
2. The magnetic release as set forth in claim 1 wherein said trigger is attached to said lever.
3. The magnetic release as set forth in claim 2 including a pin for pivotally supporting said lever and wherein said magnet is disposed adjacent said lever intermediate said pin and said jaw.
4. The magnetic release as set forth in claim 1 wherein said jaw includes an indentation and wherein an end of said lever is in contacting relationship with said indentation when said lever is in the first position.
5. The magnetic release as set forth in claim 4 wherein said lever is disengaged from said indentation when said lever is in the second position.
6. The magnetic release as set forth in claim 1 wherein said jaw includes a slot for receiving the bowstring.
7. The magnetic release as set forth in claim 6 wherein said body includes an anvil extending across said slot when said jaw is in the first position.
8. The magnetic release as set forth in claim 1 wherein said jaw includes a post and wherein said post bears against the end of said lever in response to a force exerted by the bowstring upon said jaw when said jaw is in the first position.
9. The magnetic release as set forth in claim 8 wherein said lever includes a rod for bearing against said post.
10. The magnetic release as set forth in claim 9 wherein said rod is of low friction material.
11. The magnetic release as set forth in claim 9 wherein said post is of low friction material.
12. The magnetic release as set forth in claim 11 wherein said rod is of low friction material.
13. The magnetic release as set forth in claim 1 including a second magnet supported by said lever for magnetically attracting said magnet.
14. The magnetic release as set forth in claim 1 including a second magnet supported by said lever for magnetically opposing said magnet.
15. The magnetic release as set forth in claim 14 including a third magnet supported by said body for magnetically attracting said lever.
16. The magnetic release as set forth in claim 15, said second magnet being positionally adjustable.
17. The magnetic release as set forth in claim 1 wherein said lever comprises a pair of pivotally mounted levers, one of said levers being in engagement with said trigger and the other of said levers being in engagement with said jaw.
18. The magnetic release as set forth in claim 17 including a first magnet mounted on said second lever and a second magnet mounted on said jaw for magnetically attracting said first magnet.
19. The magnetic release as set forth in claim 18 including a third magnet mounted upon said first lever for magnetically attracting said body.
20. The magnetic release as set forth in claim 1 wherein said lever comprises said trigger and wherein said lever comprises a section of a disc.
21. The magnetic release as set forth in claim 20 wherein said magnet is mounted on said section for magnetically attracting said jaw.
22. A magnetic release for a bowstring, said release comprising in combination:
- a) a body;
- b) means pivotally mounted on said body and having a first position for capturing the bowstring and a second position for releasing the bowstring;
- c) means pivotally supported on said body having a first position for retaining said capturing means in the first position and having a second position for accommodating movement of said capturing means to the second position;
- d) means for providing a magnetic force to draw said retaining and accommodating means to the first position; and
- e) means for overcoming the magnetic force to accommodate repositioning of said retaining and accommodating means from the first position to the second position.
23. The magnetic release as set forth in claim 22 including further means for establishing an opposing magnetic force to resist movement of said retaining and accommodating means from the first position to the second position.
24. The magnetic release as set forth in claim 23 including means for adjusting the degree of opposing magnetic force by said further establishing means.
25. A method for magnetically releasing a bowstring from a hand held body, said method comprising the steps of:
- a) capturing the bowstring with a jaw in a first position;
- b) releasing the bowstring from the jaw in a second position;
- c) retaining the jaw in the first position with a pivotable lever;
- d) urging the lever into a first position with a magnetic force emanating from the body to exercise said step of retaining; and
- e) providing a bias to the lever sufficient to overcome the magnetic force to reposition the lever into a second position to permit exercise said step of releasing.
26. The method as set forth in claim 25 wherein said biasing step is carried out by a trigger in operative engagement with said lever.
27. The method as set forth in claim 26 including the step of preventing movement of the trigger until the magnetic force is overcome.
28. The method as set forth in claim 25 including the step of providing a further magnetic force to resist movement of the lever from the first to the second position.
29. A triggerless magnetic release, said magnetic release comprising in combination:
- a) a body, said body including means for gripping said body with a user's fingers;
- b) a pivotable jaw for capturing a bowstring when said jaw is in a first position and for releasing the bowstring when said jaw is in a second position;
- c) an element for mechanically engaging said jaw in the first position of said jaw;
- d) a magnet for producing a magnetic force to urge retention of said jaw in the first position and in mechanical engagement with said element;
- e) a set screw for positionally adjusting the orientation of said element relative to said jaw and for locking said element in a selected position.
30. The triggerless magnetic release as set forth in claim 29 wherein said element is a section of a disc having an end and wherein said jaw includes an indentation for receiving said end.
31. The triggerless magnetic release as set forth in claim 30 wherein said jaw includes a hook for retaining the bowstring.
Type: Application
Filed: Aug 30, 2005
Publication Date: Mar 2, 2006
Inventor: Kenneth Stanislawski (Haltom City, TX)
Application Number: 11/215,092
International Classification: F41B 5/18 (20060101);