US3674001A - Archery bow in combination with draw force multiplying means - Google Patents

Abstract

An archery bow having master limbs with auxiliary limbs extending from the belly side of the bow to a position rearwardly of the master limbs. The auxiliary limbs are positioned so as to resist the flexing of master limbs during the draw of a bow string, and thus increase the projectile propelling force of a bow.

Description

United States Patent Hitt [ July 4, 1972 [54] ARCHERY BOW IN COMBINATION WITH DRAW FORCE MULTIPLYING MEANS [72] Inventor: Otis H. l-litt, Archbolcl, Ohio [73] Assignee: l-lit Archery Co., lnc., Archbold, Ohio [22] Filed: Dec. 3, 1970 [2i] Appl No.: 94,723

I521 [13. Cl ..l24/24, 273/DlGi 7, l24/30 R 51 rm. Cl I Sit] Field of Search,...{ ..l24/23, 24, 22, 35, DIG. 7, 124/4], 25, 30 R [56] References Cited UNITED STATES PATENTS 1,608,765 1l/l926 Bevier 124/24 2,092,361 9/1937 Shim 124/25 3,406,675 10/1968 Fredrickson 124/24 3,262,442 7/l966 Grable 124/24 Primary Examiner-Richard C. Pinkham Assistant ExaminerWilliam R. Browne Attorney-Owen & Owen [57] ABSTRACT An archery bow having master limbs with auxiliary limbs extending from the belly side of the bow to a position rearwardly of the master limbs. The auxiliary limbs are positioned so as to resist the flexing of master limbs during the draw of a bow string, and thus increase the projectile propelling force of a bow.

4 Claims, 5 Drawing Figures PATENTEDJUL 41912 3674001 I 152 I] UTE Z5 Z7 "35 IE El INVENTOR. //d, U TIS H. HITT.

a m -4- M W ARCHERY BOW IN COMBINATION WITH DRAW FORCE MULTIPLYING MEANS BACKGROUND OF THE INVENTION The force applied to an arrow is generated in the master limbs of an archery bow and is transferred through the bowstring to the arrow. The amount of force applied by the archer to the bowstring increases the force transmitted to the arrow from the master limbs. Good archery bows, particularly the master limb portion, are made from hard resilient materials. For many years, woods such as yew, osage orange and dagame were used in the construction of archery bows. More recently, the prior art has used laminates of wood and other materials, for examples fibrous glass and metal. The purpose of the laminates is to provide a highly resilient master limb structure which upon flexing generates the maximum amount of force relative to a given bowstring pull.

The present invention is an improved archery bow structure having at least one auxiliary limb which cooperates with an adjacent master limb to generate a cumulative force which ultimately acts upon the arrow.

It is the primary object of the present invention to provide an improved archery bow structure.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an archery bow structure constructed according to the present invention;

FIG. 2 is a front view of the auxiliary limb of the archery bow, shown on an enlarged scale;

FIG. 3 is a side view of the auxiliary limb shown in FIG. 2;

FIG. 4 is a fragmentary side view of an auxiliary limb assembly positioned on a bow; and

FIG. 5 is a front view of the auxiliary limb shown in FIG. 4.

DESCRlPTlON OF THE PREFERRED EMBODIMENTS An archery bow according to the present invention is generally indicated in FIG. 1 by the reference number 10. This particular embodiment of the archery bow includes a handle section 11 and a pair of master limbs 12 and 13 which extend outwardly from the handle section 1 l on the back side of the handle section I l, in opposed relationship to one another. An auxiliary limb 14 has a first end 15 which is fixably connected to the upper portion of the handle section 11, adjacent the belly side thereof, by a plurality of screws 16 (see FlG. 2). in the present embodiment, the first end 15 and the screw heads are covered with a veneer 17 which preferably matches the remaining portion of the handle section 11. The auxiliary limb 14 has a free end 18 which is positioned adjacent the master limb 12.

When the master limb 12 is flexed, the auxiliary limb 14 is also flexed and force is transmitted between the auxiliary limb l4 and the master limb 12.

A bowstring 19 extends between bow nocks 20 and 2]. The cumulative forces generated by the master limb l2 and the auxiliary limb 14 are transferred through the bow string 19 to the arrow (not shown).

In the present embodiment, a second auxiliary limb 22 is attached to the handle section 11. The auxiliary limb 22 has a free end 23 positioned adjacent the master limb 13.

In the present embodiment, the auxiliary limbs 14 and 22 are constructed of a hard resilient material, more specifically a wood laminate. However, other types of hard resilient material including laminates of difi'erent materials may be used. For examples, laminated fibrous glass layers, steel layers and certain plastic material layers may be utilized.

Another embodiment of the present invention is shown in FIGS. 4 and 5. Referring to FIG. 4, an archery bow has a handle section 11a and a mater limb 12a. Referring to FIGS. 4 and 5, an auxiliary limb 25 is removably attached to the bow 12a. in the present embodiment, the auxiliary limb 25 is constructed of a resilient steel.

The auxiliary limb 25 has a free end 26 which is positioned adjacent and in force transmittir? relationship to the master limb 120. A pair of ears 27 exten outwardly from a lower end 28 of the auxiliary limb 25. A pair of bolts 29 extend through openings 30 provided in the ears 27 and are positioned on opposite sides of the handle section 11a of the archery bow 10a. A strap or plate 31 is positioned over the free ends of the bolts 29 and wing nuts 32 are tightened to hold the entire auxiliary limb assembly in its proper position on the archery bow 100.

It has been found that an auxiliary limb assembly and an archery bow structure according to the present invention gives greater elficiency than was possible in prior art bow structures.

What I claim is:

1. An archery bow comprising, in combination, a handle section, a pair of master limbs extending outwardly from said handle section in opposite directions from a position adjacent the back side of said handle section, a resilient means having one terminal end portion attached to and extending from the terminal end portion of said handle section adjacent the belly side and said resilient means having a cantilevered end portion extending from said handle section to a point adjacent to and at least to or beyond a point adjacent the mid section of one of said master limbs, said resilient means having a length and width suificient to resist deflection of said master limbs when said master limbs are distorted by a drawing force on a bow string, said resilent means and one of said master limbs being spaced apart at their respective end connections to a terminal end portion of the handle portion,

2. An archery bow, according to claim I, wherein said resilient means is attached to the handle section by means of screws.

3. Archery bow, according to claim 1, wherein the resilient means is attached to the handle section by a means which extends around the handle section.

4. An archery bow, according to claim 3, wherein said means extending around the handle section comprises threaded bolts, a plate member to receive the threaded ends of said bolts, and wing nuts to threadably receive the ends of the bolts.

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Claims (4)

1. An archery bow comprising, in combination, a handle section, a pair of master limbs extending outwardly from said handle section in opposite directions from a position adjacent the back side of said handle section, a resilient means having one terminal end portion attached to and extending from the terminal end portion of said handle section adjacent the belly side and said resilient means having a cantilevered end portion extending from said handle section to a point adjacent to and at least to or beyond a point adjacent the mid section of one of said master limbs, said resilient means having a length and width sufficient to resist deflection of said master limbs when said master limbs are distorted by a drawing force on a bow string, said resilent means and one of said master limbs being spaced apart at their respective end connections to a terminal end portion of the handle portion,

2. An archery bow, according to claim 1, wherein said resilient means is attached to the handle section by means of screws.

3. Archery bow, according to claim 1, wherein the resilient means is attached to the handle section by a means which extends around the handle section.

4. An archery bow, according to claim 3, wherein said means extending around the handle section comprises threaded bolts, a plate member to receive the threaded ends of said bolts, and wing nuts to threadably receive the ends of the bolts.

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