US2819707A

US2819707A - Bow string drawing and releasing device

Info

Publication number: US2819707A
Application number: US496878A
Authority: US
Inventors: Joe M Kayfes; Henry R Garnero
Original assignee: Individual
Current assignee: Individual
Priority date: 1955-03-25
Filing date: 1955-03-25
Publication date: 1958-01-14
Anticipated expiration: 1975-01-14

Description

4, 1958 J. M. KAYFES ETAL- I 9,

BOW STRING DRAWING AND RELEASING DEVICE Filed March 25, 1955 2 Sheets-Sheet l INVENTORS I! D J0! ,v. m FIG 5 #:we/ 4. iii 70 4 1 1 J. M. KAYFES ETAL 2,819,707

BOW smmc DRAWING AND RELEASING DEVICE;

Filed March 25, 1955 2 Sheets-Sheet 2 FIG 8 IN VEN TOR! J0! M. KAY/ 5! Hi/VPY a a4? spa United States Patent BOW STRING DRAWING AND RELEASING DEVICE Joe M. Kayfes and Henry R. Garnero, Richmond, Calif.

Application March 25, 1955, Serial No. 496,878

1 Claim. (Cl. 124-35) The invention relates to manually held pull devices designed for engaging the string of the archers bow to aid in the drawing back of the bow string and in the holding and releasing of the arrow.

An object of the present invention is to provide a device of the character described which will be strong, rigid and durable in its construction and which will afford maximum pulling force on the spring with all forces symmetrical and balanced so that the device and the bow and arrow may be accurately held on shooting cen'- ter and which, notwithstanding the high forces transmitted to the bow string, will not cause an undue wearing or premature breaking of the spring.

Another object of the present invention is to provide a device of the character described which may be grasped in the palm of the hand of the user with the fingers encircling the handle portion of the device, and which provides an operating trigger positioned for convenient and easy engagement and displacement by the thumb to effect instantaneous trigger release of the arrow with minimum movement of the thumb and without in any wise disturbing the holding of the device or its position so as to thereby elfect a steady, straightforward dead accurate rifle-like shooting action.

A further object of the present invention is to provide a device of the character above which may be carried on the fingers of the archer while leaving the index and adjacent fingers and thumb free for removal of an arrow from the quill and placing on the bow in shooting position, and which may thereafter be manipulated with ease and facility to engage the bow string and arrow preparatory to drawing back of the string to arrow releasing position.

The invention posseses other objects and features of advantage, some of which, with the foregoing, will be set forth in the following description of the preferred form of the invention which is illustrated in the drawings accompanying and forming part of the specification. It is to be undersood, however, that variations in the showing made by the said drawings and description may be adopted within the scope of the invention as set forth in the claim.

Referring to said drawings:

Figure 1 is a cross sectional view of a device for drawing and releasing a bow string and arrow constructed in accordance with the present invention and shown in operative position with a bow string and arrow.

Figure 2 is a cross sectional view of the device taken at right angles to the plane of the view in Figure 1 as in, dicated by line 22 of Figure 1.

Figure 3 is a front elevation of the device.

Figure 4 is a fragmentary plan view of the device.

Figure 5 is an enlarged fragmentary view of the jaws forming part of the device.

Figure 6 is a vertical cross sectional view similar to Figure 1 but showing a modified form of the invention.

Figure 7 is a cross sectional view of the device illus- 2,819,707, Patented Jan. 14, 1958 trated in Figure 6 and is taken substantially on the plane of line 7-7 of Figure 6.

Figure 8 is a plan view, partly in cross section, of a further modified form of the device.

The device of the present invention and as illustrated in the accompanying drawings consists briefly of a housing 8 having a first elongated finger encircling handle portion 9 and a second perpendicularly related portion 11 extending forwardly of the portion 9 medially of its length and being formed at its forward end 12 for rejceipt of an end 13 of an arrow 14 and bow string 16. As will be seen in Figure l, the elongated or handle portion 9 has a length on opposite sides of the forwardly projecting portion 11 sufiicient for engagement and encircling by pairs of

fingers

17 and 18, and 19 and 20, of the archers hand 21 with the thumb 22 of the hand arranged in juxtaposition to one end 23 of the elongated handle portion 9. As will also be seen in Figure 1, the forwardly projecting portion 11 of the housing is formed with a relatively narrow section 26 at the joinder of the portion 11 with the handle portion 9 so as to permit the straddling of the narrow section 26 by the middle fingers 18 and 19 of the hand. In this arrangement the handle portion 9 is adapted to be held in vertical position with the index finger 17 uppermost and the little finger 20 of the hand lowermost, and with the thumb 22 naturally oriented over the upper end 23 of the handle. The handle 9 will thus be positioned in a common vertical plane with the bow string 16. In accordance with the present invention string latching means 27 is carried by the housing, and more specifically in the forwardly projecting portion 11 thereof, for engagement with the bow spring, and a thumb operated trigger 28 is mounted at the upper end 23 of the handle portion 9 and is connected to the latching means 27 for releasing the bow string 16 therefrom.

The forward end 12 of the housing is provided with an opening 29 arranged to receive the end 13 of the arrow and is also formed with a vertical slot 31 intersecting the opening 29 to receive the bow string. In the present construction slot 31 bisects opening 29 and is formed in a common axial plane with the opening which is also the axial plane of the bow string 16 and the handle 9 above mentioned. As will be observed from Figures 1, 3 and 4, the slot 31 extends across the full vertical dimension of the forward end 12 and back along the top wall 32 and the bottom wall 33 so as to admit the bow string 16 into the interior of the forwardly projecting portion 11 of the housing for engagement by the string latching means 27.

The string latching means here consists of a pair of sections or

jaw members

36 and 37 which are mounted in the forwardly projecting portion 11 of the housing for transverse reciprocation between a closed position at the slot 31 for retaining the string therein and an open position releasing the string. As will be seen in Figure 2, the

jaw members

36 and 37 are formed with confronting faces 38 and 39 which are formed with opposed recesses 41 and 42 which cooperate in the closed position of the jaw members to provide a bore aligned with the opening 29 to receive and accurately center the arrow therein. At their internal ends, the faces 38 and 39 are oifset to provide shoulders 43 and 44 which move into edge to edge contact at the aforementioned center of the device in the closed position of the

jaw members

36 and 37 so as to carry the bow string 16 jointly thereon, and as will be further observed from Figure 2, these shoulders are beveled so that the bow string will spring forwardly and between the confronting faces 38 and 39 at the instant the jaw members are opened from their closed position. As an important feature of the present construction the shoulders 43 and 44 are curved in the aforementioned center plane convexly away from the opening and symmetrical to the axis thereof so as to give a curved or rounded support to the string 16, thereby distributing the stress over a substantial length of the string and minimizing wear thereon.

As a further aid in the ease of use and operation of the device, spring means 46 is used for urging the

jaw members

36 and 37 to closed position, and the leading edges of the confronting faces 38 and 39 adjacent to opening 29 are beveled forwardly and away from each other as indicated at 47 so as to receive and center the bow string between the faces and to eifect a forced separation of the faces by the string against the resistance of the spring to permit passage of the string between the faces and to its supported position on shoulders 43 and 44 as above described.

in accordance with the present construction, the

jaw members

36 and 37 are formed at the forward ends of a pair of levers 48 and 49 which are pivotally mounted internally of the housing, as by

pins

51 and 52, on axes spaced on opposite sides of and parallel to the center plane of the device so that the confronting faces 38 and 39 of the jaw members will swing about the

pivot pins

51 and 52 into and from their engaged position at the center plane. The opposite or rearwardly disposed

ends

53 and 54 of the levers are formed so as to move into a spaced apart position, illustrated in Figure 2, in the closed position of the jaw members. The spring means 46 above mentioned may be conveniently provided as here shown in the form of a helical spring mounted in compression in sockets 56 and 57 provided in the opposed sides 58 and 59 of the rearwardly disposed ends of the levers.

The latching means accordingly here consists of a latch part 61 mounted in the housing for reciprocation into and from engaged position between the lever ends 53 and 54 for respectively holding and releasing the jaw members in closed position and for opening from such closed position against the resistance of the spring 46. In the form of the invention illustrated in Figures 1 to 4, the latch part 61 consists of a plunger mounted for reciprocation in a bore 62 formed in the narrow section 26 of the housing. The part is formed with ahead end 63 arranged for movement into and from an engaged position between confronting

faces

64 and 66 on the

lever ends

53 and 54, and with a stem 67 which extends through the bore 62 and is connected at its end 68 to one arm 69 of a bell crank lever 78 pivoted, as by pin "71, at the interior of handle portion 9 of the housing. A spring 72 here mounted in surrounding relation to stem 67 and in compression between an end wall 73 of bore 62 and a shoulder 74 adjacent the head end 63, normally urges the latch part into engagement between the

spaced ends

53 and 54 of the levers, thus positively holding the

jaw members

36 and 37 in closed position and the bow string 16 retained on the shoulders 43 and 44.

The trigger 28 here consists of a cylindrical plunger 76 which is mounted for reciprocation in a bore 77 formed in the housing portion 9 and opening to the upper end 23 thereof so that the plunger will project from the end 23 for engagement with and for depressing by the thumb 22 of the archers hand holding the housing as above described. The cylindrical form of the plunger 76 is of importance in providing a perfectly smooth and rounded contour which cannot injure the face or jaws of the user due to the recoil action of the device upon trigger release of the arrow. The plunger 76 is provided with a stem 78 which is pivotally connected to the other arm 79 of the bell crank it? so that depressing of plunger 76, as viewed in Figure 1, will cause a counterclockwise rotation of the bell cranl; 7t) and a withdrawal of the head end 63 of the latch part from its engaged position between the

lever ends

53 and 54, thus releasing the jaw members for opening by the bow string 16 and releasing the-string against the nominal resistance of spring 46. Upon releasing of the pressure of the thumb against the plunger 4 76, spring 72 will cause a forward movement of the latch part to it's engaged position between the lever ends 53 and 54 and a clockwise rotation of the bell crank 70 and an upward extension of the plunger 76.

As another important feature of the present construction, the handle portion 9 is formed on one side of the housing section 26, on the lower side as viewed in Figure l, with a pair of

finger loops

81 and 82 for retaining the housing on the little finger 20 and adjacent finger 19 of the archers hand 21 during movement of the hand generally so as to leave the other fingers 17 and 18 and thumb 22 free for other duties such as the selection and removal of an arrow out of the quill and placing of the arrow on the bow in shooting position.

A modified form of the invention is illustrated in Figures 6 and 7 of the drawings wherein the levers 48a and 49a are extended rearwardly from their relative length and position held in the first embodiment and through an opening 86 in the narrow section 26a of the housing so as to locate the rearwardly disposed ends 53a and 54a in the interior of the vertical elongated handle portion 9a of the housing. The advantage of this form of the invention is the increased mechanical advantage afforded by the extension of the levers 48a and 49a for a considerable distance rearwardly of their pivotal connections 51a and 52a where such increase in mechanical advantage may be desired. Latching of the forwardly arranged jaw members 36a and 37a is accomplished in the same manner as in the first described embodiment by the introducing of a latch part 63a between the spaced lever ends 53a and 54a so as to thereby lock the jaw members in closed position, and by removing the latch part 63a from its inserted position so as to release the jaw members for opening under the action of the bow string 16 as above described. In this form of the invention the latch part 63a is formed as the terminal end of one arm 91 of a bell crank 92 pivoted as by pin 93 within an interior chamber 94 provided by the housing portion 9a and having a second perpendicularly related arm 96 pivotally connected to one end of a stem portion 78a of a trigger plunger member 76a. As will be seen from Figure 6, depressing of plunger 76a will cause a clockwise rotation of the bell crank 92 and a removal of the latch part 63a from between the lever ends 53a and 54a. Contrariwise, release of pressure on plunger 76:: will cause its outward extension under the urge of spring 97 surrounding stem 78a and compressed between plunger 76a and a bottom shoulder 98 at the base of the plunger bore 77a, so as to cause a counterclockwise rotation of the bell crank 92 and the insertion of latch part 63a into engaged position between the lever ends 53a and 54a.

A further modified form of the invention is illustrated in Figure 8 of the drawings wherein the device is designed for two-handed operation for flight shooters interested only in maximum distance rather than target accuracy. In such case the archer may shoot from a sitting position holding the bow with his feet and drawing back on the string with both hands to get maximum power. The device illustrated in Figure 8 follows generally the construction illustrated in Figures 1 through 4, but the elongated handle portion 9b is made approximately twice as long as the corresponding portion 9 of the first described device, so that the archer may apply both hands 21a and 21b tothe housing portion 9b with the hands straddling the forwardly projecting section 26b of the housing. In this arrangement the handle-portion 9b is gripped in the "palms of both hands as illustrated in Figure 8 with the palms up and thus disposing the thumbs 22a and 22b of: the hands in juxtaposition to the opposite ends 23b and 99 of the handle portion 9b. As an important feature of this form of the device, apair of thumb operated triggers 28b and 101 are mounted at the ends 23b and 99 and are operatively connected to the string latching means 27b :for controlling its s'trin'g releasing operation in the same manner as described abov'e. As her'e shown, "the triggers 28b and 101 are formed with

stem portions

78b and 102 which are mounted in longitudinally extending

bores

103 and 104 of the portion 9b and extend into a centrally arranged chamber 106 where they are connected to the op posite ends of a lever 107 pivoted on pin 108 between the stems. Lever 107 is here formed with a further and perpendicularly related arm 109 which is pivoted to the rearward end 681) of the stem 67b of the sliding latch part 73b operating as hereinabove described. It will thus be understood with reference to Figure 8 that depressing of either or both of triggers 28b and 101 will cause a clockwise rotation of the lever 107 and its arm 109 and a withdrawal of latch part 73b from its engaged position between the rearwardly extending ends of latch levers as above described, and that such movement will be resisted by spring 72b. Conversely, upon release of thumb pressure on triggers 28b and 101 spring 72b will restore the triggers to their outwardly disposed position and the latch portion 73b to its inserted interlocking position.

The operations of the several devices are essentially similar. In each case the forwardly extending housing portion is oriented to thread the bow string 16 into its receiving slot 31 and with the trigger 28 depressed to permit movement of the latch jaws, the device is pushed forwardly against the bow string whereby the latter will cause an automatic opening of the jaws against the resistance of spring 46 and movement of the string between the opposed jaw faces 38 and 39 to behind the string retaining shoulders, when the jaw members will click closed. Thumb pressure on the trigger is released to permit spring 72 to move the latch part 73 into engagement between the ends of the jaw levers to thereby lock the string behind the shoulders with a strong and positive action. The arrow is inserted through opening 29 and the opposed recesses in the jaw faces, as illustrated in Figure 1, and with the string so locked and with the con venient and comfortable hand engagement provided by the device, the archer is able to apply a powerful yet easy hand-held drawing action to the bow string. It will also be noted that while maximum pulling force is thus afforded the archer, all forces are symmetrically balanced so that the device and the bow may be accurately held on shooting center. In such position the arrow may be released with a smooth, precise trigger action afforded by minimum movement of the thumb without in any wise disturbing the holding of the device, and the arrow is instantaneously released for steady, guided, straightforward, dead accurate, rifle-like shooting action.

We claim:

A device for drawing and releasing a bow string and arrow comprising, a housing including a first elongated portion formed for encircling by the fingers of the hand of the operator and adapted to be held thereby in vertical position and a second perpendicularly related portion extending forwardly of said first portion medially of its length and being formed with an opening at its forward end to receive an end of an arrow and a vertical slot to receive the bow string bisecting said opening and extending rearwardly therefrom in a common plane with said first portion, a pair of levers pivotally mounted internally of said housing on axes spaced on opposite sides of and parallel to said plane and having forwardly disposed jaw members arranged with confronting faces movable into contact at said plane in the closed position of said jaw members, said levers having rearwardly disposed ends spaced apart in said closed position, spring means urging said jaw members to closed position, the forward edges of said faces being beveled to receive and center the bow string between said faces and to effect a forced separation of said faces by said string against the resistance of said spring means to permit passage of said string between said faces to a supported position on the rearward edges of said faces, a latch part mounted in said housing for reciprocation into and from an engaged position between said lever ends for respectively holding and releasing said jaw members in closed position and for opening therefrom against the resistance of said spring means, said faces being formed with opposed recesses aligned with said opening for receipt of the arrow, a cylindrical plunger mounted for reciprocation in said first housing portion and projecting from the upper end thereof for engagement with and depressing by the thumb of-the hand holding the housing, said plunger and latch part being connected for movement of the latter from its engaged position upon depressing said plunger and for movement of said latch part into its engaged position from outward extension of said plunger, and spring means urging said latch part and plunger to their last named positions.

References Cited in the file of this patent UNITED STATES PATENTS 229,089 Burnham June 22, 1880 2,084,634 Flury June 22, 1937 2,378,187 Clark June 12, 1945 2,488,597 Konold. Nov. 22, 1949