US2966903A - Method of making a glass fiber bow - Google Patents

Description

Jan. 3, 1961 J. VENEKO 2,956,903

METHOD OF MAKING A GLASS FIBER BOW Filed July 20, 1959 v 2 Sheets-Sheet 1 INVENTOR. LEO J. VENEKO E5 ogwlW w ATTORNEYS Jan. 3, 1961 2,966,903

L. J. VENEKO METHOD OF MAKING A GLASS FIBER BOW Filed July 20, 1959 .2 Sheets-Sheet 2 INVENTOR. LEO J. VENEKO M M W ATTORN EYS United States PatentO METHOD OF MAKING A GLASS FIBER BOW Leo J. Veneko, Detroit, Mich., assignor to The Veneko gorfioration, Dunkirk, N.Y., a corporation of New Filed July 20, 1959, Ser. No. 828,326

1 Claim. (Cl. 124-23) which is opposed to the line of draw. This method has proved to be costly and inaccurate and not satisfactory since it does not allow for any range of draw pulls or draw weights. The molding of a solid bow of this type to a preconceived taper and thickness to provide a predetermined draw weight has proved to be costly and a hit and miss proposition. In order to make bows of different draw weights, it is necessary when making a solid bow in the aforedescribed manner to hand tiller the bow to the described draw weight, that is, the inner face of the bow must be sanded and adjusted to provide the proper draw weights described and to provide a proper bending of the bow limbs into a proper parabola when an arrow is shot. For example: If a solid type bow is molded to a predetermined draw weight of 70 pounds, in order to reduce the draw weight to a lower amount, as for example, 60 pounds, it is necessary to sand ofi the inner face surface of the bow. Ordinarily by sanding off three to four thousandths of an inch of material on the inner face of the bow, the draw weight can be reduced by approximately one pound. Accordingly, it will be seen that to reduce the draw weight by ten pounds, a considerable amount of material must be sanded off. During the aforementioned sanding operation, the glass fibers are exposed, cut and chafed, and many failures have resulted in the solidtype glass fiber bow from such sanding and adjusting operations. Accordingly, it will be seen that the molding of a solid type glass fiber bow to a predetermined tapering thickness is not desirable and is a distinct disadvantage. The aforementioned failures are caused by the fact that when the glass fibers or strands run lengthwise of the bow in an unidirectional manner and that any exposed cut 'or chafing reduces the strength of the bow which results from the normal high tensile strength of unidirectional glass fibers.

In a composite type laminated type glass fiber bow a tapered core which is usually made from wood is used and this core is a neutral core and does not perform any work. The core is usually backed and based by astrip of plastic reinforced with glass fiber and the bow is also provided with a wood handle riser. The correct parabola formed in a composite bow when it is drawn is predetermined by the tapered core and any adjustments thereof are again made by sanding on the inner face of the bow, that is, on the exposed face of the plastic strip which is reinforced with glass fiber. Also, any adjustments in the draw weights must be made on the exposed outer face of the backing strip. It will be seen that the sanding of the exposed inner and outer face of a composite glass 2,966,903 Patented Jan. 3, 1961 2 fiber bow again results in the exposing of the glass fibers and failures which result therefrom.

It is another object of the present invention to provide a method of making a plastic reinforced glass fiber bow from a plurality of preformed parts and wherein any desired tillered operations may be carried out on the inner faces of the parts before they are assembled whereby any exposed glass fibers are enclosed and not exposed when the bow is in use.

It is a further object of the present invention to provide a novel method of making a plastic reinforced glass fiber bow of either the straight limb type or re-curved limb type of bow.

Other objects, features and advantages of this invention will be apparent from the following detailed description and appended claim, reference being had to the accompanying drawing forming a part of the specificaq tion wherein like reference numberals designate corresponding parts of the several views.

In the drawings:

Fig. 1 is a side elevational view,of a bow made in accordance with the principles of the invention and showing the bow strung;

Fig. 2 is an outer view of the structure illustrated in Fig. 1 taken in the direction of the arrow marked 2;

Fig. 3 is a side elevational view of a tapered blank used in making the bow of the present invention and showing the blank formed with the predetermined curve which is opposed to the line of draw;

Fig. 4 is an outer view of the structure shown and illustrated in Fig. 3 taken in the direction of the arrow marked 4;

Fig. 5 is a side elevational view of a preformed tapered face strip which is used to form each of the limbs of the bow;

Fig. 6 is an inner view of the structure illustrated in Fig. 5 taken in the direction of the arrow marked 6;

Fig. 7 is a side elevational view of a separate wood handle riser which may be used in the invention;

Fig. 8 is an elevational sectional view of the structure illustrated in Fig. 1, taken along the line 88 thereof and looking in the direction of the arrows;

Fig. 9 is an elevational sectional view of the structure illustrated in Fig. 1 taken along the line 9-9 thereof and looking in the direction of the arrows;

Fig. 10 is a fragmentary, side elevational view of a modified bow made in accordance with the principles of the invention;

Fig. 11 is a fragmentary, side elevational view of another modified bow made in accordance with the principles of the invention;

Fig. 12 is a side elevational view of still another modified bow made in accordance with the principles of the invention; and,

Fig. 13 is a side elevational view of still a further modified bow made in accordance with the principles of the invention.

Referring now to the drawings, and in particular to Figs. 1 through 4, the numeral 10 generally represents what may be termed the bow blank which is one of the components of a bow made in accordance with the principles of the invention. Fig. 1 shows an illustrative bow in the assembled and strung condition. Fig. 3 shows the bow blank in the condition or shape which it receives from the mold. That is, the blank 10 is molded in a curved manner opposed or reversed to the line of drawing of an assembled and strung bow. As shown in Fig. l, the ends of the blank 10 taper slightly outwardly in thickness from the points indicated by the numerals 11 and 12. These points generally indicate the inner end of the limb portions or those portions which are bent in the 3. operation of the bow. As shown in Fig. 4, the blank 10 also tapers outwardly in cross section from the area of the points 1L and 1-2.

The blank 10 is molded to'the desired reverse curvature by any"conventional processand ismade from asuitable plastic material reinforced with glass fiber strands which are continuousand are disposed in a unidirectional man ner and whiche'xtend lengthwise of: the blank. The-glass fiber strands are indicated inF-ig's. 8 and 9 by meansofthe small circlesnumbered 13: Any suitable plastic materials may be used, as for example, .a polyester or phenolic resin maybe used. The blank 10-is preferably molded to produce adraw' weight of approximately 70pounds, andis then reduced by tillering to any desired-weightother than 70 pounds, that is, by sanding and adjusting on the inner face 14'of the blank 10.- It is possible to remove some'of the material whereby. the draw weight is changed. For example, by removing approximately three to four thousandths of an inch of material, it 'is possible to reduce the draw weight by about one pound. The draw weight of the bow can be predetermined by sanding on the inner face 14 before this component is assembled to the other parts as hereinafter described. This is a distinct advantage over the prior'art methods since the inner face which is sanded on the blank 10 will be enclosed by the other parts.

The bow of thepresent {invention further includes the handle riser 15 which is illustrated in Figs. 1 and 8 and which is made from wood and which is' bondedm the inner face'of the blank 14 by any suitable means and method. It will be understood, of course, that the handle riser 15 may be made integrally with the blank 10 out of the same plastic reinforced glass fiber material which is used in making the blank 10. As shown in Figs. 1 and7, the handle riser 15 is provided with an indentation 16 for gripping purposes. The middle portion of the handle riser may be covered with a suitable material as leather or the'like, as indicated b'y the numeral 17. The handle riser 15 may also be provided with the arrow groove-18'. As shown in Fig. 4-, the blank 10 is also provided with a relieved o-r notched portion 19 which meet's'with the notch 18.

Asshown in Figs. 1, and 6, the bow is provided with a pair of face strips 20 and 21' which are made from a plastic reinforced glass fiber material, the same as the blank 10. As' shown in Fig. 5, the face strips. may be molded with a predetermined curvature and taper where'- byit tapers outwardly both in cross section and thickness. The tapered-face strips are bonded to the inner face of the bow blank by any suitable conventional means and method; The inner face 22' of the face strips may be sanded, and adjusted to provide thedesired finished taper whereby whenthe parts are all assembled, the how will have the desired parabola formed when the bowlimbs are curved in operation. It will be seen that the surfaces 14 and 22 which are sanded on the blank 10 and limbs 20 are under tension when the bow is used and that these fibers are not chafed or exposed in any way by any sanding operation. The bow of the present invention thus overcomes the aforementioned disadvantages of the solid and composite glass fiber bows. In Fig. 1, the numeral 24 indicates the bow string.

Fig: 10 merely shows a fragmentary viewof a'modified bow made in accordance with the principles of the invention'a'nd thelp'artswhich are'sirnilarto the bow'shown in Fig; l are marked with corresponding reference numbers followed by the small letter a. The bow of Fig. 10 illustrates that his possible to providea how'having the proper and desired draw weight and parabola form when used, by making the face'strip 20a constant in thickness and the blank 10a tapering outwardly in thickness.

Fig. 11 illustrates a further modification of the invention 'in which the bow is 'provided with'a preformed blank 10b-which'is constant in thickn'essand in'which the face strip 20b tapers outwardly in thickness. The parts'of this how whichare similar to the first embodimentof Fig. l are marked with corresponding reference numerals fol-' lowed by the small letter b.

Fig. 12 is still another modification of theinvention and the parts ofthis bow which are similar to the bow of Fig. 1 are marked with similarreference numerals followed by the small letter cfi In this embodiment the handle riser 150 is shown as being made integral or molded with the bow blank 10c and from the sameplastic reinforced glass fiber material as used fo'r'the bow blank 100.

Fig 13 is illustrative of the fact that the invention may be practiced also in the making of bows of the re-curve type. That is, bows which have reverse curves formed on-the outer ends'of the limbs.- The parts of this bow which are similar to the parts of the bow of Fig. l are marked with'similar reference numerals followed by the small'letter dj Experience has shown that the bow of the present invention is light in weight, compact and efficient in use. In the composition of the resin or plastic and glass fiber used for making the blanks it is preferable to maintain a constant ratio of approximately 25% resin to glass fiber.

While it will be apparent that the preferred embodim'en'ts'of the invention herein disclosed are well calculated to fulfill the objects above stated, it will be appreciated that the invention is susceptible to modification, variation and change without departing from the proper scope or fair meaning of the subjoined claim.

What I claim is:

The method of making an archery bow, comprising the steps of, molding a bow blank from a plastic, glass fiber reinforced material; molding a limb face strip for each of the bow limbs from a plastic, glass'fiber reinforced material; forming a handle riser;'tillering the inner surfaces of the blank and face strip;.and,.bonding the blank, face strip and handle risertog'ether to form a unitary bow structure;

References Cited'in the fileof this patent UNITED STATES PATENTS 2,613,660 Bear Oct. 14, 1952 2,665,678 Bear a Jan. 12, 1954 2,689,559 Meyer Sept. 21, 1954 2,894,503 Piersonet-al July 14, 1959

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