US2000832A - Bow - Google Patents

Description

May 7, 1935. v c. FISHER 2,000,832

BOW

Filed April- 2, 1932 q 311g5ntor- Cms/R155 f2s/MR I Gttorneg Patented May 7, 1935 .UN'ITEDL S Vaomisa '.BOW: Y-

Charles -'B.v Fisher, -1fvililliamsport, Pa. applicati@ april z, 1932,; Seal' No. 502,813 i aclantis.#(01.2'1341015) i f ,i .u .n l stripv steel in exact duplicates as size andishape,

VMy. present invention relates to Vimprovements' in bows `for use in archersgand specifically, the invention relates to the type of separablebows fashioned from resilient vor spring metal, such as steel, or other appropriate material.

' equilibrium, whenv theY bow` is being used.

Because lof the minimumnumber'of Dalits ern-'- ployed-,in the bow, andof the intimate relation of theseparts, the bow possesses an unusual degree of accuracy, and a maximum of efciency with a minimum ofrweight, andY the lconstruction of the bow according to my invention enhancesrthev durability of the device. l

The invention consists in certain novel .features ,of construction, combinations, and arrangements of parts, as lwill hereinafter be more fully set forth t and claimed. Y, i `Inthe accompanying drawing `Ihave illustrated one or l,the physical embodiments oflmy invention i whereinthe partsfarercombined and arranged ac- Acordingto the bestmode I have thus fardevised forthepractical application of the principles o f ;iniention,. but uit will be-'understoodthat changes ,and v'alterations may be madein the exemplified structure ofthe drawing, within the scopeof `my appended claims, without departing from the principles of my invention.

Figure lgis a side view of an archerybowem-V bodying my invention.v v f i l Figure 2 is a View in elevation at the rear of the bow. l

of one of the limbs of the bow.

Figure '4 is a detail sectional view of the tubular handle, showing the shanks of the detachable or separable limbs, retained in the handle.

Figurev 5 is a detail sectional View taken 'at right angles to the section line of Figure 4.

' Figure 6 is a transverse sectional View through the tubular handle, at line 6 6 of Figure 5.

In carrying out my invention the limbs l and 2 of the bow arefashioned from blanks of resilient Figure 3 is an enlarged, broken, front face'view and `with uniformity in' strength andA resiliency; One and the same setof dies is employedfor stamping out the blanksfor all bow-limbs ofthe same size, thus insuring exact duplicates in a pair of limbs forthesame bow.y l f The stamped blanksarethenvformed irltigllmbs` in one set Vof `forming dies, which operationgives the correct and exact contour to the bowlimbs.,

exception the necks at thebow tipsf Then the partially completed i limbs are passed, through a smallV set of diesV that form-.the nocks atthe tips The dies are employed y'in machineslrnofwnas punch pressesand one blowof the press completes each operation in fashioningthelimbs.,

K4Inthe pressing machine a concave-convex for:

mation, in cross section, is imparted to-thelimb of thefbow, and the limb isthus fashioned withvra groove that varies 1 in depth from meu-@shaped mum 'deptnbeing inthe shank, andthejgroove gradually becomes -morfe oftheliinb. -v ,u u,

As` seen in FigureV lthe thickness of the grooved limb tapers :down from the shank 4to the tip,and I as seenin FigurefZ the Widthofthevlvivmb ,tapers V`down from the shank tothetip.

After -the groovedlimb is `formed second operation .is performed in` a suitablema-f chine, and thetwo edges ofthe-limb, adjacent the tip,V are ,turned inwardly 4from opposite directions, to form the throat orgnock 6*, with shoulders 1.,11.

shallow` toward the' tip As the two limbsvfor each bow are thus `fash,

-ionedabythe two operations in the same presses,

it vwillbe apparent that the limbs may be produced v.in quantities, andV as exact duplicates, thereby finsuring uniformity of size,` shape, and strength', as

'wellas resiliency in thetwo limbs of the bow. y: The

tensionof the bow may bevaried by varyingthe resiliency of the limbs, and the resiliencyvof-the' limbsiis variedV by varying the curvaturel of :the g'rooved` or conavofconvex limbsand itgwill-be understood that the resilency increases with a de`v crease in the depth of the groove of the limb.

Thus, while the VvU.shaped -shankspossess the required resiliencyfthat ,isV necessary to'permit their insertion in and frictional contact Vwith the Y D-shaped tubular handle, it ,will also be apparent l that the Shanks, because of their cross-sectional strengthening the handle portion of the bow and in maintaining the handle in inflexible position'.`

The tubular handlev is preferably a yseamless* tube, ,of steel, open at both ends, and forms'a formation, provide a rigidity thatjassists '7, inl f l l 2eV shanhas 3 andi, tothe tip Soi the limb, the maxi- Y t rigid structure, D-shaped in cross section. The handle is of comparatively light-weight metal, non-resilient, and it is of the required length to insure a proper supportV for the two shanks of the limbs I and 2. The weight of the metal employed,

may of course, be varied according to the strengthV of the bow on which the handle is used.

The curved Wall 8 of the tubular handle conforms to the curvature of the Ushaped shanks 3 and 4; the flattened side walls 9 of the shanks conform to the flat sides of the D-shaped handle; and the front edges of the shanks frictionally engage the inner face of the front flat side S' of the handle.

In order to give an ornamental and smooth n` ish to the handle, and to insure a durable 'andy suitable grip, I preferably apply an outer cover., l0 thereto, which may be fashioned of leather, orother appropriate material, and in desired color,-

VThe two Shanks are inserted in the opposite openends ofV the tubular'handlefor assembling the bow structure, and these Shanks, because'of their resiliency, rmay be slightly compressed to re duce their cross-sectional area, for ready insertien into the open ends of the handle'. The Shanks the tubular handle,` thereby preventing, twisting ordisplacement of the limbs, insuring a rigid joint at the handle, and at the same time strengthening thehandle.- f I l The bow-string I2, which may lbe and preferably is of multistrand' wire, is fashioned at its opposite ends Vwith attaching loops I3 that are properly spliced, and as'indicated these loops are slipped over theY tips ofthe limbs and rest'finthe hocks 6, the shoulders'lholding the loops in place.

In assembling the bow, the two limbs, through.

the medium of their shanks, are rst'secured in lthe handle,'then the lower loop of the string may be'slipped into the lower nock of the straight bow. With the bow, at its lower end, supported on the floor or ground,-pressure is applied to the upper -end of the bow for the purpose of iiexing the bow.

The bow is preferably flexedor bowed slightly be# yond its normal curvature to facilitate slipping the upper loop of the string over the upper nock,

and when pressure is released from the bow, the'v string is heldtaut with the bow in the positionof Figure 1. For dismantling the bow and separating its parts, the'rbow is unstrungby applying pressure to flex the bow to a greater degree than in Figure l in order that the upper loop may be released, after which the resiliency of the'limbs restores the bow to approximately straight position, and the other end of the loosened string may readily be disengaged from its nock. One,

or both, of the limbs may be pulled apart from the tubular handle, and in this operation, if necessary, the swollen parts, as at l l, of the limbs, may be compressed to facilitate withdrawal of the Shanks from the tubular handle. With the parts thus separated, they may be compactly arranged for shipping, storing, or for transportation.

- In the manufacturev ofthe limbs it will be apparent that the identical duplication of parts eliminates fthe necessity for weighing, measuring, and testing the limbs, for it will readily ybe evident that the accurately stamped and pressedliinbs, by the use of an appropriate machine and dies, are ready for assembling without "additional steps inthe manufacture of the bow.

The nocks at the tips of the bow to receive the ends of the cord or string are also fashioned with the same degree of 'accuracy'and facility as the bodies of vthe `bow-limbs, and do not requireY additional finishing after they leave the press or stamping machine. After the bow-limbs and nocks have been lformed as indicated, the limbs are tempered and drawn to theproper strength and toughness; y

The length of the bow may be varied, and the weightmay also be varied, the necessary strength for the bows lbeing provided by the use of slightly heavier steel blanks in the manufacture of the-limbs, or the'strength may be increased by slightly closing the groove of the concave-convex bow limbs. kThe resiliency of the limbs may bevariedby varying the curvature of the grooved or concave-convex limbs, or by varying thev thickness ofthe metal'from which the bow-'limbs are made. The stronger bows of course, require the heavier metal and deeper groove, and the lighter bows the'Y thinner metal and shallower groove.

While I have'referred to the metal as pressed steel from which the limbs are manufactured,A it will be understood that other suitable or appropriate metal or material may be employed, which possesses therequired resiliency, lightness, and strength. l

Havingv thus fully described my invention, what I claim as new and desire to secure by Letters Patent isi-,- v A l. In abow, thecombination with a tubular handle of D-shape in'crossV section, of a pairA of limbs each having a shank U-shaped in cross section and rigidly retained within said handle.V

2. In a separable bow for archery, the combination with a tubular handle D-shape in cross section, of'a pair of limbs each having a shank U-shape incross ysection and retained by fric-

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