US3552373A

US3552373A - Archery bow with variable strength adjusting means

Info

Publication number: US3552373A
Application number: US789311A
Authority: US
Inventors: Jerome M Van Hecke
Original assignee: C C SIGLE; W H BOSWELL
Current assignee: C C SIGLE; W H BOSWELL
Priority date: 1969-01-06
Filing date: 1969-01-06
Publication date: 1971-01-05
Anticipated expiration: 1988-01-05

Abstract

An archery bow comprising a frame member having a left half and a right half, first and second arm members pivotally attached at one end to said left and right halves, the arms being of equal length and attached equidistant from the outer ends of the left and right halves of the frame, a bowstring connecting the unattached ends of the first and second arms, means resiliently connecting the unattached ends of the first and second arms to the outer end portion of the left and right halves respectively, whereby when the bowstring is drawn, the resilient connecting means are distended.

Description

O Umted States Patent 1111 3,552,373

[72] Inventor JeromeM.Van Hecke 5 R ference Cited Magma UNITED STATES PATENTS [21] P 586,713 7/1897 Peters 124/24 [221 Ned 1 932 195 10/1933 Strou p... 124/22 [451 paemed 1971 2 714 377 8/1955 Mulke 124/24 Assignees w. Boswe" y Waldo, Ark. Primary Examiner-George .l. Marlo a part interest to each; Assistant Examiner-William R. Browne C.C. Sigle v Attorney-Shlesinger, Arkwright & Garvey Waldo, Ark. a part interest to each ABSTRACT: An archery bow comprising a frame member having a left half and a right half, first and second arm members pivotally attached at one end to said left and right halves, the arms being of equal length and attached equidistant from [54] VARIABLE STRENGTH the outer ends of the left and right halves of the frame, a 5 claims Drawing Figs bowstring connecting the unattached ends of the first and second arms, means resiliently connecting the unattached [52] US. Cl.. 124/ ends of the first and second arms to the outer end portion of F41b5/00 the left and right halves respectively, whereby when the [50] Field ofSearch 124/24, 23, bowstring is drawn, the resilient con ecting means are 22, 25 distended.

PATENTEUJAN SIB?! 3552.373

Jerome Von.//ecK WWW r 9 4/ ATTORNEYS ARCHERY BOW WITH VARIABLE STRENGTH ADJUSTING MEANS BACKGROUND The present invention relates to an archery bow of new and novel construction, and includes a means whereby the tension on the bowstring, and thus the power of the bow may be easily adjusted.

Prior art bows have constructionswhereby the power of a bow might be adjusted by various means such as springs and the like. Most of these devices have been somewhat awkward, and the accuracy of the bow has been limited to some extent by this awkwardness.

OBJECTS OF THE INVENTION It is therefore a primary object of this invention to provide a bow of new and novel construction.

A further object of this invention is to provide a novel bow construction including a novel means for adjusting the power of a bow to suit the archers strength.

Still another object of this invention is to provide a bow wherein the means for adjusting the pull of the bow does not interfere with the archer.

Another object of this invention is to provide a bow wherein the adjustment may be easily accomplished.

These and other objects and advantages of this invention will be apparent from the following description and claims.

DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of the bow of this invention showing in dotted lines the position of the various bow members when the bow is drawn.

FIG. 2 is a fragmentary elevational view of the pivotal arm of the bow.

FIG. 3 is a fragmentary plan view of the joint structure of the pivotal arm taken along lines 3-3 of FIG. 2.

FIG. 4 is a fragmentary view of the resilient members connecting the arms and the frame.

DESCRIPTION OF THE INVENTION In FIG. I, 2 designates the frame member of the bow having left half portion 4 and right half 6. The left half 4 has an outer end portion 8, and the right half 6 has an outer end portion 10. Frame member 2 includes a handgrip portion 12 of a type known in the art, and may also include an arrow rest 14.

Pivotally attached to left half 4 at point 16 is arm member 18, and attached in a like manner to the right half 6 at point 20 is right arm member 22. At the unattached end of arms I8 and 22 are a plurality of

notches

24 and 26 respectively. Near the outer end 8 of the left half of the frame member 4 are a plurality of notches 28 and correspondingly at the outer end 10 of the right half 6 of the frame member are a plurality of notches 30.

Connecting the unattached ends of

arms

18 and 22 is a bowstring 32 of the type generally known in the art. Connecting the unattached ends of

arms

18 and 22 with the outer ends 8 and I of left and right halves, 4 and 6, of frame member 2 are

resilient members

34 and 36. These members may be of any suitable construction such as an ordinary rubberband, or they may be a piece of endless resilient tubing. An alternate structure for these resilient members is illustrated in FIG. 4 and this embodiment features a means by which two straight pieces of rubber tubing 38 may be attached to a loop 40 which loop would pass around the bow frame members 8 and or

arms

18 and 22. The connection is made by means of a ball 42 inserted within the ends of tubes 38, and the tubing being tied around the loop 40 as shown at 44. It is obvious that this is only one possible means for securing these resilient members, and this application is intended to cover all possible modes by which said members are attached.

In FIG. 3 is illustrated one possible means by which arm member 22 is pivotally attached to the right half 6 of frame member 2. The pivoted end of arm 22 is bifurcated and provided with furcations 44 on either side of web member 46 which is formed integrally with frame member 6. A pivot pin 20 is passed through

members

44 and 46 for'securing these members in a pivotal relationship. A stop 49 is provided to limit the extent to which the bow may be drawn.

As is best seen in FIG. 2, the point of contact between arm 22 and frame portion 6 is a bearing surface 48. This is provided to prevent wear which may'otherwise occur at this point.

ADJUSTMENT PROCEDURE Also seen in FIG. 2 is the novel means by which the power or pull of the bow may be adjusted. By varying the position of the resilient member 36 in

notches

26 and 30, a large amount of variation of the pull of the bow may be obtained. With the resilient member 36 attached at the point shown on arm 22, the angle of the resilient member may be varied between Angle l and Angle 2 as shown. With the member 36 positioned at Angle I, the greatest amount of pull will be obtained, while if the position is varied to Angle 2, the pull of the bow will be at a minimum. Thus when resilient member 36 is attached at the outermost notch 26 of arm 22, and the innermost notch 30 of frame member 10, the least amount of pull for the bow will be obtained. Conversely, when the resilient member 36 is positioned between the innermost notch 26 of the arm 22 and the outermost notch 30 of frame member 10, the greatest amount of pull of the how will be obtained.

Obviously, the pull of the bow may be varied even more by changing either the length or strength of resilient member 36.

As shown in the dotted line portion of FIG. 1, when an arrow 50 is placed in the proper position with respect to the bow, and the bowstring 32 is drawn,

resilient members

34 and 36 are distended. Thus the power of the bow is determined by the position and structure of

resilient members

34 and 36. These resilient members may be of natural rubber, any variety of synthetic material, or may even include springs. Any of these modifications would come within the perview of this application.

While the invention has been described in connection with different embodiments thereof, it will be understood that it is capable of further modification, and this application is intended to cover any variation, uses, or adaptations of the inventions following in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practices in the art to which the invention pertains, and as may be applied to the essential features hereinbefore set forth and as fall within the scope of the invention or the limits of the appended claims.

I claim: I

I. An archery bow comprising:

a. a frame member having a left half having an outer end portion and a right half having an outer end portion;

b. a first arm pivotally attached at one end to said left half;

. c. a second arm pivotally attached at one end to said right half;

d: said first and second arms being of equal length and at tached equidistant from said outer end portions of said left and right halves;

e. a bowstring connecting the unattached ends of said first and second arms; I

f. means resiliently connecting the unattached end of said first arm to said outer end portion of said left half;

g. means resiliently connecting the unattached end of said second arm to said outer end portion of said right half.

h. whereby when said bowstring is drawn, said resilient connecting means are distended;

i. means for adjusting the tension of said bow string;

j. a plurality of means near said outer end portion of said left half frame member for adjustably receiving and retaining said resilient connecting means;

k. a plurality of means near said outer end portion of said right frame member for adjustably receiving and retaining said resilient connecting means; and

l. a plurality of means near said unattached ends of said first and second arms for adjustably receiving and retaining said resilient connecting means.

2. An archery bow as in claim 1 and wherein:

a each of said first and second arms is attached to said left and right frame halves by means of a pivot pin passing through said arms and said frame halves; and

b. said arms contact said frame halves at bearing surfaces.

connecting means being positionable between a notch on said arm and a notch on the adjacent frame half.

Claims

1. An archery bow comprising: a. a frame member having a left half having an outer end portion and a right half having an outer end portion; b. a first arm pivotally attached at one end to said left half; c. a second arm pivotally attached at one end to said right half; d. said first and second arms being of equal length and attached equidistant from said outer end portions of said left and right halves; e. a bowstring connecting the unattached ends of said first and second arms; f. means resiliently connecting the unattached end of said first arm To said outer end portion of said left half; g. means resiliently connecting the unattached end of said second arm to said outer end portion of said right half, h. whereby when said bowstring is drawn, said resilient connecting means are distended; i. means for adjusting the tension of said bow string; j. a plurality of means near said outer end portion of said left half frame member for adjustably receiving and retaining said resilient connecting means; k. a plurality of means near said outer end portion of said right frame member for adjustably receiving and retaining said resilient connecting means; and l. a plurality of means near said unattached ends of said first and second arms for adjustably receiving and retaining said resilient connecting means.

2. An archery bow as in claim 1 and wherein: a. each of said first and second arms is attached to said left and right frame halves by means of a pivot pin passing through said arms and said frame halves; and b. said arms contact said frame halves at bearing surfaces.

3. An archery bow as in claim 2 and wherein each of said first and second arms is positioned within a recess in said left and right frame halves.

4. An archery bow as in claim 1 and wherein said means for adjustably receiving and retaining said resilient means includes notches.

5. An archery bow as in claim 4 and wherein said resilient connecting means being positionable between a notch on said arm and a notch on the adjacent frame half.