U.S. patent number 3,890,951 [Application Number 05/414,863] was granted by the patent office on 1975-06-24 for adjustable arrow rest.
This patent grant is currently assigned to Jennings Compound Bow, Inc.. Invention is credited to Thomas Paul Jennings, Carl Sumida, John Monroe Williamson.
United States Patent |
3,890,951 |
Jennings , et al. |
June 24, 1975 |
Adjustable arrow rest
Abstract
An adjustable arrow rest having a support and structure to
adjustably position the support with respect to a bow to permit
movement of the support in a generally up and down direction with
respect to the longitudinal dimension of a bow. An assembly is
adjustably positioned on the support with the assembly including a
plunger having an arrow-engaging tip and structure to yieldingly
bias the plunger for supporting engagement of the tip with the
shaft of an arrow. The assembly may also include structure to vary
the position of the plunger and structure to vary the biasing force
on the plunger. This permits adjustment of the position of the
plunger and the biasing force which the plunger may exert in
yieldingly supporting the shaft of an arrow. A spring biased
support member may be provided in a bow to cooperate with the
plunger to provide a lateral support for an arrow shaft positioned
therebetween. An additional assembly may be mounted on the support
with its plunger engaging an arrow shaft. The two assemblies and
the spring biased support member provide a three-point support for
an arrow shaft.
Inventors: |
Jennings; Thomas Paul (Sun
Valley, CA), Williamson; John Monroe (Hollywood, CA),
Sumida; Carl (Los Angeles, CA) |
Assignee: |
Jennings Compound Bow, Inc.
(North Hollywood, CA)
|
Family
ID: |
23643304 |
Appl.
No.: |
05/414,863 |
Filed: |
November 12, 1973 |
Current U.S.
Class: |
124/44.5 |
Current CPC
Class: |
F41B
5/10 (20130101); F41B 5/1438 (20130101); F41B
5/143 (20130101) |
Current International
Class: |
F41B
5/00 (20060101); F41B 5/22 (20060101); F41b
005/00 () |
Field of
Search: |
;124/41A,24R,24A,25,3R,DIG.4,3A |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Pinkham; Richard C.
Assistant Examiner: Browne; William R.
Attorney, Agent or Firm: Roston; Ellsworth R.
Claims
We claim:
1. An adjustable arrow rest comprising:
an assembly including a sliding plunger having an arrow engaging
tip and means to yieldingly bias the plunger for supporting
engagement with the shaft of an arrow;
first means releasably attached to a second means for supporting
said assembly at a position spaced from a bow;
second means adapted to be mounted on a bow operatively connected
to said first means to permit movement of said first means and said
assembly with respect to said second means in an upward or downward
direction generally along the longitudinal dimension a bow and to
also permit transverse movement of said first means and said
assembly with respect to generally the longitudinal axis of a
nocked arrow supported by a bow;
said second means including a quick release to fix said first means
and said assembly in a desired position vertically with respect to
the longitudinal dimension of a bow and transversely with respect
to the longitudinal axis of a nocked arrow supported by a bow to
fix said first means and said assembly in the new position, and
third means operatively connecting said assembly to said first
means to releasably fix the angle of said assembly so as to vary
the angle between the longitudinal axis of the plunger and the long
dimension of a bow.
2. The adjustable arrow rest of claim 1 including
means on said assembly to vary the position of said plunger.
3. The adjustable arrow rest of claim 1 including
means to vary the biasing force on said plunger.
4. The adjustable arrow rest of claim 1 including
means to vary the position of said plunger, and
means to vary the biasing force on said plunger.
5. The adjustable arrow rest of claim 1 including
a cap having a low frictional surface, and
means to position said cap on the tip of said plunger for
engagement of said surface with a shaft of an arrow.
6. The adjustable arrow rest of claim 1 wherein said assembly
includes
a cylindrical body;
said plunger being retained within said body and biased to an
extended position with respect to said body, and
means to adjustably position said body in an axial direction to
vary the extended position of said plunger.
7. The adjustable arrow rest of claim 6 wherein
said body includes an internal thread;
a spring positioned within said body with one end of the spring
bearing against the plunger to bias the plunger to its extended
position;
a threaded plug in engagement with the internal thread of said
body, and
the plug being in engagement with the other end of said spring,
whereby the biasing force of said spring may be altered by
threadable rotation of said plug with respect to said body.
8. The adjustable arrow rest of claim 6 including
an external thread on said body and
a support having an internal thread in engagement with the external
thread on said body,
whereby rotation of the body with respect to the support moves the
body in an axial direction with respect to the support.
9. The adjustable arrow rest of claim 1 including
yieldable arrow engaging means adapted to be positioned on a bow to
exert a yielding force against the side surface of an arrow shaft,
and
said assembly being positionable to yieldingly bias said plunger
tip in an upward direction angled toward said yieldable arrow
engaging means,
whereby an arrow shaft is supported on its undersurface by
engagement with said plunger tip and is supported with respect to
lateral movement between said plunger tip and said yieldable arrow
engaging means.
10. The adjustable arrow rest of claim 9 including
an additional assembly including a plunger having an arrow engaging
tip and means to yieldingly bias the plunger for supporting
engagement of the plunger tip with the shaft of an arrow, and
said additional assembly being positioned to provide a third-point
of suspension to an arrow shaft with the shaft being contacted by
the plunger tip of said assembly, said yieldable arrow engaging
means, and the plunger tip of said additional assembly.
11. The adjustable arrow rest of claim 1 wherein said first means
includes:
an L-shaped support member having legs;
one leg of said support member being supported by said second means
for rotational movement with respect to the bow, and
the other leg of said member engaging said third means to support
said assembly.
12. The adjustable arrow rest of claim 1 wherein
said first means includes a support member which is rotatable in a
plane which parallels the longitudinal dimension of a bow with
rotation of said member providing movement of said assembly in a
direction along the longitudinal dimension of a bow.
Description
BACKGROUND OF THE INVENTION
Previously, arrow rests for an archery bow have been considered as
perishable items. Thus, they were replaced periodically much like a
bow string. Arrow tests were made of various materials such as
feathers, leather, thin plastic, bristle brushes, nylon brushes,
etc. During usage, arrow rests became worn through numerous
contacts with an arrow shaft and eventually they would be replaced
with a new arrow rest, etc.
During the wearing-out process of previous arrow rests, their
contour would change which would change the position of the arrow
shaft slightly with respect to the bow. This would, in turn, have
an adverse affect upon the accuracy of the arrow's flight.
Additionally, previous arrow rests, being made of perishable
materials, frequently broke at inopportune times, such as during an
archery contest or on a hunting trip. The unreliability of previous
arrow rests and the inaccuracy resulting from their usage have
created many problems for archers.
Accordingly, there is a need for an improved arrow rest which is
more durable than previous arrow rests and which does not change in
its contour during usage.
SUMMARY OF THE INVENTION
In providing an improved arrow rest which is more durable and also
offers a wide variation of adjustments to suit the archer, the bow,
the manner in which the arrow is released, etc., the arrow rest of
the invention includes support means and means to adjustably
position the support means with respect to a bow to permit movement
of the support means in a generally axial direction with respect to
the bow. An arrow rest assembly is adjustably positioned on the
support means. Thus, by movement of the support means with respect
to the bow and movement of the assembly with respect to the support
means, a wide variety of adjustments may be made in positioning the
assembly with respect to the bow.
The assembly includes a plunger which has an arrow-engaging tip.
Means are provided to yieldingly bias the plunger for supporting
engagement of the plunger tip with the shaft of an arrow. Thus,
with the assembly positioned with respect to the bow, the
arrow-engaging tip of the plunger provides yieldable supporting
engagement between the plunger tip and the shaft of an arrow.
The adjustable arrow rest may also include means on the assembly to
vary the position of the plunger. Additionally, also, the arrow
rest may include means on the assembly to vary the biasing force on
the plunger. These further means of adjustment provide more
flexibility in the use of the arrow rest for bows of various draw
weights. Additionally, these further adjustments provide more
flexibility in the use of the arrow rest for arrows of various
diameters and the use of the arrow rest in conjunction with various
types of arrow releases.
In the use of the arrow rest for hunting, a cap having a
low-frictional surface may be positioned on the tip of the plunger.
Thus, with the arrow rest providing support for the shaft of an
arrow, the arrow shaft is engaged by the cap rather than the
plunger tip. This reduces the noise which would otherwise occur
through contact of the arrow shaft with the plunger tip during
drawing of the bow.
BRIEF DESCRIPTION OF THE DRAWINGS
With reference to the drawings, which are merely illustrative of an
embodiment of the invention,
FIG. 1 is a side view of a compound bow with an arrow rest of the
invention mounted on the bow;
FIG. 2 is an enlarged fragmentary side view of the handle section
of the bow taken on the broken lined circle denoted 2 in FIG. 1 and
illustrating the placement of the arrow rest with respect to the
bow;
FIG. 3 is an end view of the handle section shown in FIG. 2 as seen
from the direction of the inner surface of the handle section;
FIG. 4 is a top sectional view taken along the line 4--4 of FIG.
2;
FIG. 5 is an end view, similar to FIG. 3, showing use of the arrow
rest for hunting with a plastic cap positioned on the tip of the
arrow rest plunger and with vanes being shown on the arrow shaft;
and
FIG. 6 is a sectional view taken along the line 6--6 of FIG. 3
illustrating the internal structure of the arrow rest assembly.
DETAILED DESCRIPTION
FIG. 1 illustrates a compound bow 2 having a handle section 4, a
handle 5, and upper and lower limbs 6 and 8 affixed to the handle
section. An arrow rest 9 of the invention is affixed to the handle
section 4 in a position for supporting the shaft of an arrow while
the upper and lower limbs 6 and 8 are joined to the handle section
4 by channel support members 10 and 12.
A bow string 14 is connected through bow string cables 16 and 18 to
eccentrically mounted pulleys 20 and 22. The bow string cables 16
and 18 are each fixed to their respective pulleys 20 and 22 with
the cables each positioned within a groove (not shown) in a
pulley.
Draw cables 24 and 26 are connected respectively to channel support
members 10 and 12 with the draw cables passing over respective draw
pulleys 28 and 30 and secured at their outer ends to the
eccentrically mounted pulleys 20 and 22. The draw cables 24 and 26
are each secured to their pulley 20 or 22 by being positioned
within a groove (not shown) which is axially offset with respect to
the groove which contains the bow string cable as described
previously. The draw pulleys 28 and 30 are joined to the upper and
lower limbs 6 and 8 by the use of connectors 32 and 34.
The compound bow 2 shown in FIG. 1 does not form a part of this
invention and is illustrated only to demonstrate the manner of
using the arrow rest 9. For a more detailed description of a
compound bow, reference is made to U.S. Pat. No. 3,486,495, issued
Dec. 30, 1969.
Turning to FIG. 2, the arrow rest, referred to generally as 9, may
be secured to the inner or back surface 36 of the handle section 4
by a carriage support bracket 38. The support bracket 38 is joined
to the back surface 36 by bushing screws 40 which may engage
recessed bushings 42, shown in phantom line drawing within the
handle section 4.
Formed integrally with the support bracket 38 is a U-clamp 44
positioned at the lower end of the support bracket. An aperture 46
is formed between the legs of the U-clamp 44 and an adjustment
screw 48 passing through the legs of the U-clamp 44 may be
threadedly secured to the innermost of the two legs. On rotation of
the adjustment screw 48, the legs of the U-clamp 44 may be brought
into closer contact to, thereby, reduce the size of the aperture
46.
An L-shaped carriage rod, generally denoted 50, has one of its legs
51 positioned within the aperture 46 while the other of its legs 53
extends forwardly toward the front of the handle section 4. By
rotation of the leg 51 with respect to aperture 46 on loosening of
the adjustment screw 48, the leg 53 may move upwardly or downwardly
in a generally axial direction with respect to the bow 2. An arrow
rest assembly, generally designated 52, is positioned on the leg 53
and the assembly, thereby, experiences upward or downward movement
in response to movement of the leg 53.
If desired, the arrow rest 9 may be secured to a front surface 49
of the handle section 4 rather than being secured to the back
surface 36. The securing of the rest 9 to the front surface 49 is
illustrated in phantom line drawing in which the support bracket is
designated 38', the U-clamp as 44', and the leg as 53'. When
mounted on front surface 49, the arrow rest 9 may be adjustably
positioned in the same general manner as when the rest is
positioned on back surface 36 to provide reliable and uniform
support for an arrow shaft during draw of the bow and discharge of
the arrow.
The handle section 4 may include an offset portion 54 to provide a
window for placement of an arrow shaft with the assembly 52 being
mounted within the offset portion. As illustrated, the assembly 52
includes an externally threaded cylindrical body 56 which is
threadedly engaged with threaded apertures passing through the legs
of a U-clamp 58. The legs of the U-clamp 58 define an aperture 59
which surrounds the leg 53 of the L-shaped carriage 50. To fix the
position of the cylindrical body 56 with respect to the U-clamp 58,
a lock nut 60 may be threadedly engaged with the body in bearing
engagement with one of the legs of the U-clamp 58. By loosening the
lock nut 60 and then rotating the cylindrical body 56, the body may
be moved axially in one direction or another with respect to the
U-clamp 58 depending upon the rotational direction of the body.
A plunger 62 extending from the body 56 is biased yieldingly to an
extended position in which its tip may contact the lower side
surface of an arrow shaft illustrated in phantom line drawing as
64. A side rest guide 66 may be positioned on the handle section 4
to contact the side surface of the arrow shaft 64. With the plunger
62 directed upwardly against the underside of the shaft 64 and
angled toward the side rest guide 66, the arrow shaft is supported
on its undersurface and is also supported on either side with
respect to lateral movement. If desired, the side rest guide 66 may
be in the form of a yieldably biased plunger with the result that
the arrow shaft is then yieldably supported on its undersurface and
also on both of its side surfaces.
FIG. 4, which is a sectional view taken along the line 4--4 of FIG.
2, illustrates the bushings 42 as positioned within a recess 68 in
the handle section 4 as, for example, when the handle section is
made of metal. As stated previously, the structure of the compound
bow 2 is not a part of the present invention. Thus, the arrow rest
of the invention is not restricted in its usage to a compound bow
or to a bow having a metallic structure. The arrow rest 9 may be
utilized with any type of bow such as a longbow, a recurved bow, a
bow formed from wood or from wood laminated to plastic or metal,
etc.
The side rest guide 66, as stated, may be in the form of a
yieldably biased plunger and is so illustrated in FIG. 4. The side
rest guide 66 is shown as contained within a cylindrical body 70
having a spring 72 positioned therein which bears against the
underside of the side rest guide 66. The cylindrical body 70 may
conveniently be recessed in a hole formed in the handle section 4
such that the side rest guide 66 is positioned for yieldable
engagement with a side surface of the arrow shaft 64.
When used in hunting, as illustrated in FIG. 5, the plunger 62 may
include a plastic cap 73 positioned over its tip. The plastic cap
73 may be secured to the tip of the plunger 62 by any convenient
means such as by the use of internal threads on the cap which
engage external threads on the plunger tip. The plastic cap 73 is
conveniently formed of a material having low-frictional properties
such as Teflon (a trademark of E. I. DuPont de Nemours). The use of
the plastic cap 73 reduces the noise that results from contact of
the arrow shaft with the plunger tip during draw of the arrow.
Also, the cap 73 provides a larger supporting surface for arrows
having a larger diameter shaft.
Plastic vanes, denoted as 75, are frequently used instead of
feathers in steadying the flight of an arrow. Using three vanes 75,
as illustrated, the arrow shaft 64 may be positioned with the vanes
at 1, 5, and 7 o'clock. This avoids contact of the vanes 75 with
the arrow rest plunger 62 or with the side rest 66 during release
of the arrow -- which could throw the arrow off its intended path
of flight.
As indicated in FIG. 5, a second arrow rest assembly 90 having an
L-shaped carriage rod 92 supported by a U-clamp 94 may be mounted
to resiliently bias a cap 96 against the arrow shaft 64. The second
assembly 90 may be mounted by a support bracket 98 that is
connected to either the back surface 36 or front surface 49 (see
FIG. 2). Through use of the second assembly 90 in conjunction with
assembly 52 and the side rest guide 66, three point suspension may
be provided for the arrow shaft 64. This stabilizes the position of
the shaft 64 in providing increased accuracy during draw and
discharge of an arrow.
As illustrated, the second assembly 90 is positioned to avoid
contact of the cap 96 with the vanes 75. Thus, with arrow vanes 75
positioned at 1, 5 and 7 o'clock, the second assembly 90 may, for
example, be adjusted to positioned the tip 96 at approximately 9
o'clock.
In use of a second arrow rest assembly 90, the cap 96 may be
removed so that the tip of the plunger 99 directly contacts the
shaft 64. The cap 96 functions in the same manner as the previously
described cap 73 in reducing noise during draw of the arrow or in
providing a larger supporting surface for the arrow shaft.
The internal structure of the assembly 52 is shown in FIG. 6 which
is a sectional view taken along the line 6--6 of FIG. 3. The
cylindrical body 56 includes a bore 74 that is stepped at 78 and
leads to a smaller bore 76. The exterior surface of the plunger 62
is also stepped at 80 and leads to an enlarged head 82. The step 80
of the plunger 62 bears against the step 78 with the plunger in its
fully extended position to retain the head 82 within the cylinder
56.
A recess 84 formed within the head 82 may receive one end of a coil
spring 86 while the other end of the spring bears against the inner
end of a threaded plug 88. The external threads on the plug 88
engage internal threads in the bore 74. Thus, by rotation of the
plug 88, e.g., by insertion of an Allen wrench within an external
socket in the plug, the plug may be moved inwardly or outwardly
with respect to the bore to vary the compressive force exerted by
the spring 86 against the plunger 62. As mentioned in regard to
FIG. 5, the tip of the plunger 62 may be threaded for retention of
a plastic cap 73 and, as illustrated, the plunger 62 includes a
threaded tip 90.
The pressure exerted by the shaft of an arrow on an arrow rest will
vary with the draw weight of the bow. Thus, by varying the biasing
force exerted by the plunger 62, the present arrow rest can be
adjusted for use on bows of varying draw weight. Also, in the case
of a compound bow, as described, where the draw weight can be
varied by adjusting the position of the limbs with respect to the
center section, the present arrow rest can be adjusted to suit
varying draw weights for the same bow.
The nocking point of the arrow on the bow string will change to
some extent depending on whether the arrow is released by the
archer's fingers or by an arrow release of some type. Thus, the use
of an arrow release or a specific type of release, will also affect
the force imparted by the arrow shaft to the arrow rest. This may
be adjusted for in the present arrow rest in maintaining accuracy
by varying the biasing force which the arrow rest imparts to the
arrow shaft.
Another factor which affects the use of an arrow rest is the size
of the arrow shafts. The present arrow rest, being fully
adjustable, may be used with arrows of varying shaft diameter. The
position of the rest itself, as described, may be adjusted in an
axial or transverse direction with respect to the bow. Also, the
axial position of the plunger 62 may be varied and the biasing
force of the spring 86 against the plunger may be varied through
movement of the plug 88. This permits adjusting the rest to the
archer, the draw weight of the bow, the release, and the size of
the arrows to obtain the maximum in accuracy and reliability.
* * * * *