US1960477A - Bow for archery - Google Patents

Description

R. H. COWDERY BOW FOR ARCHERY May 29, 1934.

Filed March 5, 1929 @WL INVENTOR BY f J k L h ATTORNEY.

Patented May 29, 1934 BOW FOR ARCHERY Robert H. Cowdery, Geneva, Ohio, assignor to The American Fork & Hoe Company, Cleveland,

Ohio, a corporation of Ohio Application March 5, 1929, Serial No. 344,287

4 Claims.

My invention relates to archers bows.

Archers bows of metallic material have been previously proposed for use, but the use of such bows has not been attended by success in all re- 5 spects for a number of reasons, among which are the undue weight of the bows, improper distribution of flexure in weight, breakage of the bows as sometimes occurs, and injury to the user as sometimes attends such breakage.

An object of my present invention is to provide a bow comprising limbs of tempered steel so constructed that for a given weight of steel material, a high degree of efliciency in accuracy and in length of flight of the arrow, which is projected from the bow, is secured.

Another object of my invention is to provide a bow so made as to practically eliminate the danger of personal injury and destruction of the bow resulting from breakage of the resilient bow limbs when the bow is drawn, in use.

Another object of my invention is to provide an improved steel bow of pleasing appearance, of high efliciency in use, and which may be manufactured relatively inexpensively.

Another object of my invention is to provide a bow which will not be subject to warping and which will not be substantially injured if unstringing of the bow is not done immediately after each use of the same, as is required with present day bows.

Another object of my invention is to provide an archers bow which will not emit an unpleasant metallic sound when an arrow is discharged from the bow; also, which will have limbs utilizing to the utmost the resiliency of the tempered steel, but which will not be disagreeably cold to the touch in cold weather, nor have the hard metallic surface of steel bows previously proposed for use.

Other objects of my invention and the invention itself will become apparent by reference to the following description of a preferred embodiment of my invention which is illustrated in the accompanying drawing, wherein:

Fig. 1 is a side elevational view of a bow which is an embodiment of my invention;

Fig. 2 is an enlarged view of a tip end of the said bow;

Fig. 3 is an elevational view of one of the limbs of the bow of my invention, the outer resilient sleeve being removed;

Fig. 4. is a side elevational of the limb of Fig. 3;

Fig. 5 is a view mostly in section of a portion view of a fragment of the hand grip and parts associated therewith for the said how;

Fig. 6 is an end view of the bow handle of Fig. 5;

Figs. 7 to 13, inclusive, are views taken on the lines 7-7, 38, 99, l010, 1l11, 12-12 and 13-l3 of Fig. 1;

Fig. 14 is a view taken on the line l5-15 of Fig. 5;

Referring now to the different figures of drawing in all of which like reference characters are employed to indicate the same parts, at 1 and 2,

I show a pair of like bow limbs, each containing resiliently enveloped blades 3 of highly tempered steel and each alike being gradually tapered in transverse cross section proceeding from their shank portions shown for the limb 2 at 4, to their tips 5. Each of the limbs terminate at their tips in bow-string supporting hooks 6. The bow limbs are joined by a so-called paradox, said paradox comprising a tubular metallic sleeve 7 which supports a hand grip 8, which is provided in the form of an annular sleeve 26 telescoped over the tubular sleeve 7, and which is kept in place in the position best indicated in Fig. 1, preferably by means of fibre collars 27 and 28 which are rigidly secured in place on the exterior surface of the tube 7 in compressive contact with the grip; tubular sleeve 9 are forced onto the ends of the tube 7, and retain the collars in place.

Telescoped within the tube 7 is disposed a tubular sleeve 15, which, as illustrated, is preferably formed in transverse section, of hollow U- shape. The convex wall 24 of the sleeve 15 is preferably arcuate in the form and preferably corresponds in transverse curvature to the curvature of the inner wall of the tube 7.

The sleeve 15 is wedged tightly in place in telescoped position within the tube 7 preferably by a wooden wedge 19 projected from opposite ends 9 of the tube '7 and which is complementary to the concave wall 20 of the sleeve 15, being of generally gibbous form. I preferably make the sleeve 15 from a relatively thin-walled cylindrical steel tube by infolding lateral portions of one side of the tube so as to give it the resilient form which in transverse sections is approximately U-shaped, with rounded edges.

Both of the bow limbs vary in form progressively from their shanks 4, held within the paradox, to their tips. The bow limbs each comprise an integral steel blade 3 tightly encased in a resilient tubular envelope 10. The blade in portions nearest the shank 4 is provided with inclined lateral walls 30, which are more nearly other material forming 'tive effort which can only be 2 1 straight than are the more arcuate walls, such as 31 and 32, progressively disposed nearer and nearer the tip portion of the limb. Expressed in another way, the bow limbs are arched transversely in all sections, proceeding from their shanks to their tips, being more abruptly arched in portions near the shanks 4 and proceeding progressively to a more flattened arch form as shown by Fig. 12. At the tips the metal is formed in such a way as to provide strong supporting dome shaped tip ends 5, adapted to support the tips 6, which are integrally formed as a projection of the channel blade 3 of the limb as best illustrated at the bottom of Figs. 2 and 3.

The resilient envelope 10 for each bow limb is of especially tapered form adapted to tightly and compressively encase the bow limb. This envelope may be made of varying materials such as vulcanized rubber, or preferably of a cellulose composition commonly called in the trade, Pyroxyline, which may be colored to closely resemble wood, the coloring comprising a longitudinally extending grain effect. The cellulose or the envelope is preferably formed before application to the bow limbs, and being expansible under the eiTect of heat, is preferably warmed during application to the bow limb. Considerable care in applying the envelope to the bow limb is necessary to avoid fracturing the envelope.

This envelope, when cooled to the temperature of the blade, modifies the action of the blade in a very advantageous way, by stiffening the blade, and subduing tendencies toward segmental vibrations. Also it accelerates the reaction when the arrow is loosed. Moreover, it very materially reduces the possibility of breakage of the blade, and at the same time should a blade be broken upon an undue drawing of the bow by'an archer using it, the envelope being resilient and flexible to a considerable degree, will retain the broken ends, resisting the independent movement of the ends and restrain the rearward movement of the archers hand, with which he accomplished the draw on the bow-string.

In addition to the above, the envelope dampens the metallic sound of the blade, which otherwise would be unpleasantly audible, avoids the chill feel of the metallic blade when the same is touched by the hand and visually appearing like wood, gives to the blade all of the advantageous properties of a wood bow limb, at the same time preserving and adding to the efficiency of retracsecured by the use of tempered steel blades.

Having tightly wedged the bow limb receiving tube 15 into the paradox tubular body '7 by means of the driven wood-wedge 19, the end caps or sleeves 9 are tightly pressed on to the ends of the tube '7. The end walls of each of the caps 9 contain an approximately U shaped slot formed soas to be capable of alignment with the bore of similar cross sectional form, provided through the tubular sleeve 15, whereby the shanks 4 of the bow limbs, which are likewise approximately U- shaped in transverse cross sectional form, may be projected through the aligned slots in the caps and into the interior of the tubular sleeve against the compressive effect of the wood wedge tending to force the concave wall of the sleeve inwardly.

A very tight fit of the limb shankswithin the sleeve 15 of the paradox is accomplished by preferably making the shank portions 4 slightly reversely tapered in cross-sectional form at its end so that a gradually tighter and tighter fit is had by the shanks as they are projected within the tubular sleeve, and whereby the sleeve will very tightly grip the shanks, by the resilient pressure of its metallic walls and by the compressive effects of the wedging wood strip 19.

Also, preferably, the shank portions of the limbs are so formed that cross-sections disposed progressively nearer the ends of the shanks are of progressively differing channel form, the depth of the channel being progressively made less and less as also is the spacing between the two lateral portions thereof. This is illustrated in Fig. 3.

Although both of the bow limbs may be made removable, I preferably so tightly wedge one of the limbs, 2, within the tubular sleeve 15 that any ordinary pull will not remove this limb of the bow and I sometimes increase the difiiculty of removal of one of the limbs, such as 2, by first coating it with a cementitious substance prior to inserting it within the sleeve.

A bow constructed as described can be made in quantities of uniformly good quality and without any reasonable liability of being broken in use. The outer metallic surface of the bow, comprising surfaces of the limbs and the tubular paradox may be given a suitable rust-proof coating so as to avoid deterioration through rust.

Having thus described my invention, I am aware that numerous and extensive departures may be made from the embodiment herein illustratedand described but without departing from the spirit of my invention.

I claim:

1. A bow comprising a pair of limbs, each including a tapered blade of approximately U'-form in transverse sections, and a resilient, relatively flexible tubular envelope tightly encasing the blades.

2. A bow comprising a pair of limbs, each including a tapered blade of approximately U-form in transverse sections, and a resilient, relatively flexible tubular envelope of cellulose material and having a bow limb back wall stretched between the lateral edges of the blades.

'3. A bow comprising a pair of limbs, each including a tapered blade of approximately U-form in transverse sections, and a resilient, relatively flexible tubular envelope tightly encasing the blades, the sections nearest the shank being progressively more sharply arched than those rela- -tively more remote therefrom.

4. In a bow for archery, the combination with 'a hand grip, of a pair of resilient bow limb blades formed of tempered steel material, rigidly secured thereto and extending in opposite directions therefrom, each of the blades comprising resilient portions of approximately U-shaped cross-sectional form, of progressively graduated crosssectional areas, integral bow-string supporting horns at the tips of the blades, and a flexible, re- 3 silient, tubular envelope tightly encasing the blades.

ROBERT H. COWDERY.

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