U.S. patent application number 12/536480 was filed with the patent office on 2010-08-05 for archery bow string suppressor with adjustable spring tension.
Invention is credited to Joseph Brewster.
Application Number | 20100192931 12/536480 |
Document ID | / |
Family ID | 42396681 |
Filed Date | 2010-08-05 |
United States Patent
Application |
20100192931 |
Kind Code |
A1 |
Brewster; Joseph |
August 5, 2010 |
Archery Bow String Suppressor With Adjustable Spring Tension
Abstract
An archery bow string suppression device with adjustable spring
tension and isolated free floating transfer rod designed to be used
to dampen the shock and vibration normally associated with firing a
bow or crossbow.
Inventors: |
Brewster; Joseph;
(Gilbertsville, PA) |
Correspondence
Address: |
Eli Weiss, Esq. / Oakwood Law Group, LLP
14 Bond Street - SUITE 386
Great Neck
NY
11021
US
|
Family ID: |
42396681 |
Appl. No.: |
12/536480 |
Filed: |
August 6, 2009 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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61188053 |
Aug 6, 2008 |
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Current U.S.
Class: |
124/89 |
Current CPC
Class: |
F41B 5/1407
20130101 |
Class at
Publication: |
124/89 |
International
Class: |
F41B 5/20 20060101
F41B005/20 |
Claims
1. An archery bow string suppressor adapted to be removably
attached to a fitting or hole on an archery bow or cross bow, said
string suppressor comprising: a shaft having a cushion member of
vibration damping material mounted on a first end for contacting a
bow string and dampening string vibrations, a body having a chamber
within which a second end of said shaft is located; a mounting bolt
having a head which may be surrounded by an O ring located at or
near one end of said chamber; and a spring located in said chamber
having an end which may be seated on an O ring around the head of
the mounting bolt and another end resting on an adjustable internal
bushing.
2. The archery bow string suppressor of claim 1 wherein said second
end of said shaft is attached to a first bushing and a second
bushing located adjacent to said first bushing.
3. The archery bow string suppressor of claim 2 wherein said first
and second bushings are movably attached to shaft, said shaft
containing threads, etchings, grooves, or similar items designed to
maintain said bushings in their desired location.
4. The archery bow string suppressor of claim 3 wherein one end of
said spring seats on the first bushing.
5. The archery bow string suppressor of claim 4 wherein said spring
may or may not be compressed.
6. The archery bow string suppressor of claim 5 wherein said first
and second bushings are composed of or contained vibration
absorbing material such as rubber or elastomer.
7. The archery bow string suppressor of claim 6 wherein said first
bushing controls spring tension and shaft travel.
8. The archery bow string suppressor of claim 7 wherein said second
bushing provides adjustment of the location of the cushion member
relative to the bow string when the string suppressor is attached
to an archery bow or cross bow.
9. The archery bow string suppressor of claim 8 wherein a scale is
located on said shaft to indicate the distance that the shaft moves
when an arrow is shot.
10. The archery bow string suppressor of claim 9 wherein an O ring
or similar type device is moveably coupled to the shaft to mark the
distance on the scale that the shaft moves when an arrow is
shot.
11. The archery bow string suppressor of claim 10 wherein said rod
is isolated from said body through the use of said first and second
bushings as well as additional isolation bushings mounted in said
body.
12. A method of stabilizing a bow string with a string suppressor
adapted to be removably attached to a fitting or hole on an archery
bow or cross bow, said method comprising: providing a shaft having
a cushion member of vibration damping material mounted on a first
end for contacting a bow string and dampening string vibrations,
providing a body having a chamber within which a second end of said
shaft is located; locating a mounting bolt having a head which may
be surrounded by an O ring at one end of said chamber; and placing
a spring in said chamber with one end seated against the O ring or
mounting cap and an opposite end seated against said adjustment
bushing.
13. The archery bow string suppressor of claim 12 wherein second
end of said shaft is attached to a first bushing and a second
bushing located adjacent to said first bushing.
14. The method of claim 13 wherein said first and second bushings
are movably attached to the shaft.
15. The method of claim 14 wherein a bushing of vibration absorbing
material isolates the body from the shaft.
16. The method of claim 15 wherein said first and second bushings
are composed of or contain vibration absorbing material such as
rubber or other elastomers.
17. The method of claim 16 wherein said first bushing controls
spring tension and shaft travel.
18. The method of claim 17 wherein said second bushing provides
adjustment of the location of the cushion member relative to the
bow string when the string suppressor is attached to a archery bow
or cross bow.
19. The archery bow string suppressor of claim 18 wherein a scale
is located on said shaft and an O ring or similar device is
moveably coupled to the shaft to mark a distance on the scale that
the shaft moves when an arrow is fired.
20. The method of claim 13 wherein said second bushing provides
final adjustment of the location of the cushion member relative to
the bow string when the string suppressor is attached to a bow; and
said first bushing sets string tension to control shaft travel when
an arrow is shot.
Description
REFERENCE TO RELATED APPLICATIONS
[0001] This patent application claims the benefit of U.S.
Provisional Application No. 61/188,053 filed on Aug. 6, 2008, the
disclosure of which is incorporated herein in its entirety by
reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates generally to archery bows, and
more specifically to an apparatus that is attached to a compound
bow to suppress vibration and sound associated with a bow string
when an arrow is released.
[0004] 2. Description of Related Art
[0005] The compound bow is a popular form of bow that allows a user
to achieve greater accuracy and distance relative to other types of
bows. The compound bow consists of a rigid riser which is the
support member for the limbs and a string suppressor. The limbs are
very stiff members and a levering system, usually of cables and
pulleys are used, to cause the limbs to bend to store all the
energy of the bow.
[0006] As a user pulls on the bow string, the pull increases to a
peak and then "lets off". This reduced force, or let off, allows a
user to more easily hold the bow fully drawn while taking aim. A
user will usually use a mechanical release that attaches to the
bowstring near the point where the arrow attaches to provide a more
consistent release.
[0007] The compound bow has a relatively low weight and, therefore,
is more sensitive to torque, vibration and slight movements of the
users hand and/or arm as an arrow is fired. Torque can occur as the
arrow leaves the bow. A problem that can occur with compound bows
is the build up of a vibration as an arrow is fired. Normally
between 70-85% of the stored energy in the limb members is
transferred to the arrow as kinetic energy. Thus, about 15% to 30%
of the stored energy is transferred to and absorbed by the limbs
and the riser. It is believed that this energy that is transferred
to and absorbed by the limbs and the riser is the cause of
vibration that occurs in the rigid riser and the stiff limb
members.
[0008] What is needed is a string suppressor that can be attached
to the riser of a compound bow that allows an archer to shoot more
accurately by reducing vibration of the bow string when the arrow
leaves the bow.
SUMMARY OF THE INVENTION
[0009] There is disclosed an archery bow string suppressor adapted
to be removably attached to a fitting on an archery bow includes a
shaft having a cushion member of vibration damping material mounted
on a first end of the shaft for contacting a bow string and
dampening string vibrations and a body having a chamber within
which the second end of the shaft is located. A mounting bolt
having a head surrounded by an O ring is located at one end of the
chamber. A spring is also located in the chamber and functions as a
shock absorber as the bow string hits the cushion member of said
rod.
[0010] The foregoing has outlined, rather broadly, the preferred
feature of the present invention so that those skilled in the art
may better understand the detailed description of the invention
that follows. Additional features of the invention will be
described hereinafter that form the subject of the claims of the
invention. Those skilled in the art should appreciate that they can
readily use the disclosed conception and specific embodiment as a
basis for designing or modifying other structures for carrying out
the same purposes of the present invention and that such other
structures do not depart from the spirit and scope of the invention
in its broadest form.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Other aspects, features, and advantages of the present
invention will become more fully apparent from the following
detailed description, the appended claim, and the accompanying
drawings in which similar elements are given similar reference
numerals.
[0012] FIG. 1 is a side perspective view of a string suppressor
with an offset bracket for attachment to the riser of a compound
bow in accordance with the principles of the invention;
[0013] FIG. 2 is an exploded view of the string suppressor of FIG.
1;
[0014] FIG. 3 is a side view of two types of elastomer boots that
can be placed on the end of the shaft for contact with the string
of a bow;
[0015] FIG. 4 is a side perspective view of a string suppressor
with a mounting bolt for attachment to the riser of a compound bow
in accordance with the principles of the invention; and
[0016] FIG. 5 is a partial view of a riser of a compound bow
attached to a string suppressor with a mounting bolt in accordance
with the principles of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
[0017] The primary function of the string suppressor disclosed is
to reduce string vibration and sound associated with the string
when an arrow is being fired from a bow.
[0018] The string suppressor has two principle components, a main
body and a shaft.
[0019] Referring to FIG. 1, there is shown is a side perspective
view of a string suppressor 10 which includes a main body 12 and a
shaft 14. An offset bracket 16, which is attached to the lower end
of the main body 12 allows the shaft to be oriented to be aligned
with and engage the string of a bow when an arrow is fired.
[0020] Referring to FIG. 2, there is an exploded view of the string
suppressor 10 on FIG. 1. The main body 12 and the parts that are
located in the main body are shown. The main body is designed with
a chamber 18. One end of the chamber supports a thread 20 and the
opposite end has an opening 22 within which is a bushing 24
composed of a smooth low friction material such as nylon, Teflon,
rubber, Delrin or the like. The shaft 14 is supported by bushing 24
which helps to dampen vibrations by eliminating any metal to metal
contact between the shaft and the main body 12, allowing the shaft
to move in and out without binding.
[0021] The top or string end 26 of the shaft 14 is attached to an
elastomer boot 28 and the opposite end of the shaft has threads 30
for receiving two bushings 32, 34. Bushings 32, 34 are composed of
Viton or of any other material that can be adjusted along the shaft
while also serving to eliminate metal to metal contact.
[0022] The bushings are provided for adjusting spring tension,
shaft travel and shaft length. The bushings also eliminate metal to
metal contact and aid in reducing vibration. Each bushing fits
tightly around the threaded end of the shaft and functions as a
threaded nut. The bushings can be moved up or down the threaded
portion of the shaft by being turned either clock wise or counter
clock wise. In place of the threads on the end of the shaft, any
type of etching or cross grid on the shaft end can be used which
will hold the bushings in place while also allowing a user to
adjust their location.
[0023] Bushing 34 is provided to control spring tension and shaft
travel when an arrow is fired. Bushing 32, which is independent of
bushing 34, is used to provide the final adjustment of the shaft
length toward the bow string which allows a user to locate the end
of the elastomer boot to be spaced slightly away from the bow
string while at brace height.
[0024] A cap 38, which includes a centrally located threaded
mounting bolt 40, is threaded into one end of the main body 12. The
opening in cap 38 is sized to provide a slip fit for the threaded
shaft 42 of the mounting bolt. The diameter of the head of the
mounting bolt is less than the diameter of the cap and is located
within an O ring 44. A spring 36, which is in compression, is
located between the bushing 34 and cap 38. Thus, one end of spring
36 seats on the bushing 34, which can be of Viton, and the opposite
end of the spring seats on O ring 44. The end of spring 36 does not
contact the small diameter head of the mounting bolt 40. Spring 36
can be coated with a plastic covering, located within a plastic
sleeve or coated with any material or substance which will dampen
vibration and allow for a quite and smooth motion of the spring
while eliminating any metal to metal contact.
[0025] The threaded end 42 of bolt 40 is sized to be threaded into
a threaded receiving opening in the riser of a compound bow or into
a threaded opening of an off set bracket 16. When an off set
bracket is used, the threaded bolt 48 is used to mount the string
suppressor to the riser of a compound bow.
[0026] In some instances the opening in the riser of the compound
bow that is provided for receiving a string suppressor is a smooth
bore opening with a set screw, it is not threaded. With bows of
this type, cap 38, bolt 40 and off set bracket 16 of FIG. 2 are
removed and a second cap 60 has an off center stud, one end of
which is threaded into the second cap and the other end is threaded
into a rod of metal such as aluminum which has a smooth outside
surface. This rod is sized to fit into the smooth bore opening in
the riser and is held in position with the set screw. Threading the
off center stud on the second cap into the rod allows the string
suppressor to be oriented relative to the bow string by rotating
the string suppressor about the off center stud.
[0027] The outside surface of the main body includes three grooves
25 for receiving O rings. The O rings are provided to allow a user
to grip the body 12 when the cap 38 is being unscrewed from the
main body 12, or the main body is being attached to or removed from
the bow and also serve to absorb vibration resonance from main body
12 before it can be transferred into bow riser.
[0028] The shaft, which is provided to transfer energy from the
string to a spring located in a chamber in the main body 12,
includes a scale 49. The scale is provided to allow a user to see
exactly how far the shaft traveled when an arrow is shot. The scale
is located where the shaft enters the main body and operates with a
floating O ring 50 that is provided to indicate the travel distance
of the shaft. To use, a user slides the O ring down the shaft until
it touches the top of the main body. When a user shoots an arrow,
the string will hit boot 28 pushing in shaft 14 into the main body
against the force of spring 36, and then return. As the shaft
returns to its rest position, O ring will follow and move with the
shaft. The distance between the top of the main body and the O ring
is the distance that the shaft traveled.
[0029] Referring to FIG. 3 there is shown a side view of two types
of elastomer boots 28 that can be placed on the end of the shaft 14
for contact with the string of a bow.
[0030] FIG. 4 is a side perspective view of a string suppressor 10
with a standard mounting bolt for attachment to the riser of a
compound bow.
[0031] FIG. 5 is a partial view of a riser of a compound bow
attached to a string suppressor 10 with a mounting bolt.
[0032] The string suppressor disclosed differs from other string
suppressors in that it uses a spring to dampen string vibration and
can be adjusted for tension and travel and isolates rod 14 from
direct metal to metal contact from the remaining components of the
invention.
[0033] The advantages of the string suppressor disclosed are
that:
1. The string suppressor has the ability be mounted directly
in-line or offset. 2. The string suppressor offers adjustable
tension to match a user's individual set-up. 3. The string
suppressor offers a smooth and progressive stop opposed to static
rod suppressors which abruptly halt the string's forward progress.
4. The string suppressor has adjustable travel 5. The string
suppressor has a travel indicator gauge which lets a user know
exactly how far the string has moved when an arrow is shot. 6. The
string suppressor is not affected by temperature.
[0034] While there have been shown and described and pointed out
the fundamental novel features of the invention as applied to the
preferred embodiments, it will be understood that various omissions
and substitutions and changes of the form and details of the
apparatus illustrated and in the operation may be done by those
skilled in the art, without departing from the spirit of the
invention.
* * * * *