Crossbow Structure

Abstract

A crossbow structure for projecting an elongate feathered arrow having a butt portion and an elongate barrel with a bow secured to a forward or muzzle end of the elongate barrel. The barrel has a bore having longitudinally spaced resiliently supported arrow positioning members therein and longitudinal slots at each side of the bore for travel of a bow string therealong. The crossbow structure has a trigger member and linkage operatively connected to a sear for selectively holding and releasing the bow string. A cam safety is positioned to be selectively moved into and out of engagement with the trigger member and an elongate safety pin is positioned to be selectively moved into and out of engagement with the sear for holding or releasing the bow string. The stock has an aperture therein for access to a gripping portion adjacent the trigger member. An upwardly biased arrow positioning member is positioned at both the breech and the muzzle ends of the barrel.

Description

The present invention relates to crossbows and the like for propelling arrows or similar projectiles through a bore toward a target and more particularly to such crossbows having novel arrow positioning members, a novel trigger member and firing linkage, and novel safety members associated therewith.

The principal objects of the present invention are: to provide a crossbow structure having an elongate stock with a butt portion and an elongate barrel portion and an aperture in the stock adjacent a trigger member thereby forming a gripping portion; to provide such a crossbow structure which will accommodate different diameter and weight arrows; to provide such a crossbow structure having a removable bow portion whereby the crossbow structure is adapted to interchange bows of different strength for accurately firing arrows of different diameters and weights; to provide such a crossbow structure having novel positioning members for supporting and positioning arrow shafts of different diameters and weights; to provide such a crossbow structure having a novel trigger member and firing linkage and novel safety members associated with the trigger member and firing linkage for selectively holding same in a nonfiring position and releasing same for firing a feathered arrow; to provide such a crossbow structure which is economical to manufacture, has simple parts which are easily removable and stored, and is particularly well adapted to the proposed use.

Other objects and advantages of this invention will become apparent from the following description taken in connection with the accompanying drawings wherein are set forth by way of illustration and example certain embodiments of this invention.

FIG. 1 is a perspective view of a crossbow structure embodying features of the present invention.

FIG. 2 is a side elevational view of the crossbow structure with portions broken away to show operating components and an arrow being loaded therein.

FIG. 3 is a side elevational view similar to FIG. 2 except having the arrow in position for firing.

FIG. 4 is a fragmentary front elevational view showing mounting means for the bow.

FIG. 5 is a plan view of the crossbow structure.

FIG. 6 is an enlarged fragmentary longitudinal sectional view showing a trigger member and firing linkage.

FIG. 7 is an enlarged fragmentary longitudinal sectional view showing a forward arrow positioning member.

FIG. 8 is a transverse sectional view through the crossbow structure taken on line 8-8, FIG. 3, showing bow string release mechanism.

FIG. 9 is a transverse sectional view through the crossbow structure taken on line 9-9, FIG. 3, showing a rear arrow positioning member.

FIG. 10 is a transverse sectional view through a barrel portion of the crossbow structure taken on line 10-10, FIG. 3.

FIG. 11 is a transverse sectional view through a muzzle end of the barrel portion taken on line 11-11, FIG. 3, showing the forward arrow positioning member.

FIG. 12 is a fragmentary longitudinal sectional view taken on line 12-13, FIG. 6, showing safety means for a sear.

FIG. 13 is a fragmentary longitudinal sectional view taken on line 13-13, FIG. 6, showing safety means for the trigger member and firing linkage.

Referring more in detail to the drawings:

The reference numeral 1 generally designates a crossbow structure for projecting a feathered arrow 2 toward a suitable target (not shown). The crossbow structure 1 has an elongate stock 3 having a butt portion 4 and an elongate barrel portion 5 having a longitudinal bore 6 extending from a breach portion 7 to a muzzle end 8 of the barrel portion 5. A bow 9 is removably secured to the barrel portion 5 adjacent the muzzle end 8 thereof and the bow 9 has a bow string 10 connected to opposite ends of the bow 9 and extending through longitudinal slots 11 and 12 formed at opposite sides of the barrel portion 5 and communicating with the bore 6. The bow string 10 is adapted to be engaged with the feathered arrow 2 or a like projectile for propelling same to the target (not shown).

In the illustrated structure, the stock 3 is generally in the form of a modified rifle with the butt portion 4 being adapted to be placed against and engaged with a person's shoulder and the barrel portion 5 supported whereby the person can sight along front and rear sights 13 and 14 respectively mounted on the barrel portion 5 in aiming the crossbow structure 1 for flight of the arrow 2 toward the desired target when the bow string 10 is released, as hereinafter described.

The bore 6 extends longitudinally from the breech portion 7 to the muzzle end 8 of the barrel portion 5 and is adapted to receive support and guide the feathered arrow 2. The bore 6 preferably has an arcuate or concave trough-shaped bottom portion 15 for substantially the full length thereof with longitudinally spaced arrow positioning members 16 and 17 in the breech portion 7 and the muzzle end 8, respectively. The bottom portion 15 is below the arrow positioning members 16 and 17 thereby permitting the arrow to be placed in the bore 6, as shown in FIG. 2.

Each of the arrow positioning members 16 and 17 has a longitudinal channel or trough 18 extending the length thereof and presenting a concave upper face for receiving a shaft portion 19 of the feathered arrow 2 positioned in the bore 6 of the crossbow structure. The trough-shaped, arcuate bottom portion 15 of the bore 6 terminates at the sides thereof in longitudinally extending lands 20 that are slightly below the channel or trough portion 18 of the arrow positioning members 16 and 17 whereby the lands 20 are engaged by outer extremities 21 of lower guide vanes or feathers 22 that extend laterally outwardly from a rear portion of the arrow 2. The bore 6 is particularly adapted for arrows having two lower guides or feathers 22 and a third upper or upright guide or feather 23 with the guides or feathers 22 and 23 being circumferentially spaced around the periphery of a rear portion of the arrow.

The bore 6 has a longitudinal slot 24 in an upper portion thereof with the slot 24 extending between the breech portion 7 and the muzzle end 8 and is of a suitable size for freely passing the upper feather or guide 23 as the arrow is projected from the bore 6. On lower opposite sides of the longitudinal slot 24 there are arcuately curved surfaces 25 and 26 which extend the length of the slot 24 for cooperating with the channel or trough 18 in the arrow positioning member 17 in the forward or muzzle end 8 to engage forward portions of the arrow shaft portion 19 of the arrow 2 positioned in the bore 6 thereby providing a three land engagement or bore portion for the arrow 2 which forms the guiding engagement for the arrow as it is projected from the bore 6.

The longitudinal slots 11 and 12 are each defined by upper and lower surfaces 27 and 28, respectively, with the upper surfaces 27 being generally horizontal and intersecting the curved surfaces 25 and 26. The lower surface 28 of the slots 11 and 12 is preferably arranged in a longitudinal plane that forms a uniform supporting engagement to the bow string 10 when the bow string is engaged in a rear recess 30 of an arrow nock 31.

A portion of the longitudinal slot 24 extending from the rear of the forward arrow positioning member 17 to a loading opening 32 is enlarged, as indicated at 33 in FIG. 6, to a width slightly greater than the diameter of the arrow shaft 19 to serve as a guide therefor during loading. The length of the enlarged portion 33 of the longitudinal slot 24 between a forward end of the loading opening 32 and adjacent a rear end of the arrow positioning member 17 provides for receiving the arrow shaft into the bore 6 from above and through the loading opening 32, as illustrated in FIG. 2.

The muzzle end 8 of the barrel portion 5 is reinforced with stiffeners 34 to strengthen said muzzle end 8 against stresses therein caused by flexure of the bow 9. The bow 9 is preferably removably mounted and secured to the muzzle end 8 of the barrel portion 5. In the illustrated structure, the bow 9 has a notch 35 in a top side thereof positioned at the center. The notch 35 is shaped to receive a flange 36 extending forwardly from an upper surface of the muzzle end 8 of the barrel portion 5 whereby the bow 9 may be secured thereto as by a plurality of screws or bolts 37 extending through the flange 36 and notched portion of the bow 9.

The notch 35 in the bow 9 has a generally horizontal surface 38 having a recess 39 therein aligned with the bore 6 for supporting a forward or head end of the arrow shaft 19 permitting the lower guide vanes or feathers 22 to pass through the center portion of the bow 9. The flange 36 has the longitudinal slot 24 extending along a lower surface thereof for passage of the third or upper feather or guide vane 23. The arcuate or curved surfaces 25 and 26 extend along the slot 24 of the flange 36 to engage upper portions of the arrow shaft 19 when the arrow is projected from the crossbow structure 1, thereby continuing the upper land engagement with the arrow shaft 19 for guiding same as it is projected from the crossbow structure 1.

The bow string 10 extends through the longitudinal slots 11 and 12 and is connected to opposite ends 43 and 44 of the bow 9 as in conventional practice. The length of the bow string 10 and initial tensioning on the bow 9 may be adjusted whereby a desired pull on the bow is necessary to draw the bow string 10 rearwardly in the slots 11 and 12 to a cocked position, as later described. In order to fire a feathered arrow 2 from the crossbow structure 1, the bow string 10 must be drawn back and engaged with and retained by a sear 45 before the arrow 2 is inserted into the bow. A trigger mechanism 46 operatively engages the sear 45 for actuating same in releasing the bow string 10 from the sear 45.

In the illustrated structure, the trigger mechanism 46 is mounted in a lower portion of the stock 3 adjacent the breech end of the barrel portion 5 which has a longitudinally slotted recess 47 to receive a trigger member 48. The trigger member 48 is a planar member having a forward edge 49 and a rear edge 50. The forward edge 49 of the trigger member 48 has a notch 51 for receiving a cam safety 52, as later described, and the rear edge 50 of the trigger member 48 has an enlarged lug portion 53. The trigger member 48 is pivotally mounted in the slotted recess 47, as by a pin 54 which is received in the stock 3. As in conventional practice, the trigger member 48 is enclosed within a suitable trigger guard 46' and only a lower end portion of the trigger member 48 extends below the lower portion of the stock 3 and into the space protected by the trigger guard 46'.

A trigger linkage guideway 55 communicates with the slotted recess 47 and extends longitudinally rearwardly and communicates with a sear guideway 56, as later described. A forward end 57 of an elongate, pivotally mounted lever 58 engages the lug portion 53 of the trigger member 48 and a rear end 59 of the lever 58 extends into the sear guideway 56 for effecting retractive movement of the sear 45 for releasing the bow string 10.

The sear guideway 56 extends in a line transversely of the breech portion 7 of the longitudinal slots 11 and 12 and is adjacent a rear end of the bore 6 and the sear guideway 56 has upper and lower bore portions 61 and 62 above and below, respectively, the slots 11 and 12. The sear 45 is illustrated as an elongate planar rod or shaft slidably mounted in the sear guideway 56 and extendible across the breech portion of the slots 11 and 12 and into the upper bore portion 61 to engage and retain the bow string 10 when the bow 9 is in bow-cocking position. The planar sear rod is positioned rearwardly of the trigger member 48 and forwardly of the rear of the slots 11 and 12 whereby the bow string 10 may be moved behind the sear 45 when in cocked position. The elongate sear rod has a beveled upper end 63 urged into the upper bore portion 61 by a suitable resilient member 64.

In the illustrated structure, the sear flange 60 is positioned adjacent a lower end of the sear rod and the resilient member 64 is an elongate spiral spring sleeved on a lower end of the sear 45 and having one end engaging a lower surface of the sear flange 60 and the other end engaging a lower end of the sear guideway 56 which is illustrated as a plug 56'.

The beveled upper end 63 of the sear 45 is slanted upwardly from a forward edge thereof to facilitate camming the sear 45 downwardly below the slots 11 and 12 so the bow string 10 will move thereover and the upper end 63 is also rounded at the rear thereof to facilitate the bow string 10 being released from the sear 45 when same is moved downwardly below the longitudinal slots 11 and 12 by a rearward pull on the lower portion of the trigger member 48. One end of a spring 48' is connected to an upper portion 50' of the trigger member 48 for positioning the notch 51 to receive the cam safety 52. The other end of the spring 48' is received in an upper surface of the recess 47 whereby rearward pull on the lower portion of the trigger member 48 must overcome resistance of the spring 48' thereby providing for a smooth trigger pull as compared to a trigger jerk which destroys aiming accuracy.

The cam safety 52 is engageable with the trigger member 48 to prevent accidental firing. The cam safety 52 is illustrated as a planar member movable into and out of the notch 51 and has an end portion extending outwardly through a recess 65 in one side of the stock 3. The cam safety 52 is mounted on a pin 66 which is rotatably mounted in the lower breech portion of the stock. The pin 66 is frictionally retained in a suitable sleeve 66' mounted in the stock 3 for holding the safety 52 in a safe or firing position. A keeper in the form of a washer or enlarged portion is positioned to maintain the safety 52 on the pin 66.

An elongate safety pin 67 is slidably mounted in the stock 3 adjacent the sear 45 and is adapted to be engageable with a lower surface of the sear flange 60 for holding the sear 45 in a nonfiring or safe position. The safety pin 67 has a notch or recess 68 in the side adjacent the sear 45 with the notch or recess 68 being sized to permit the sear flange 60 to move therethrough thereby permitting firing of the feathered arrow 2 when the safety pin 67 has been moved out of engagement with the sear flange 60. The pin 67 is a planar member having a pair of spaced recesses positioned to receive a resilient keeper member 67' within the stock 3 adjacent the sear guideway 56. When the keeper 67' is engaged in one of the recesses, the notch 68 is positioned to permit the sear flange 60 to move therethrough and when the keeper 67' is engaged in the other recess in the safety pin 67, the pin 67 is positioned below and engaging the sear flange 60 thereby preventing accidental firing.

When the cam safety 52 is engaged in the notch 51 of the trigger member 48 and the safety pin 67 is positioned to engage a lower surface of the sear flange 60, rearward movement of the trigger member 48 is prevented and the beveled upper end 63 of the sear 45 is maintained in the nonfiring position extending above the slots 11 and 12 so that the bow string 10 cannot move thereover until the safeties 52 and 67 are adjusted and a lower portion of the trigger member 48 is moved rearwardly.

The barrel portion 5 is illustrated as formed of a plurality of pieces or sections to facilitate manufacture and particularly the shaping of the interior of the bore 6 and the slotted recess 47, trigger linkage guideway 55, and sear guideway 56.

In the illustrated structure, an aperture 69 extends through the stock 3 and is positioned between the slotted recess 47 and the breech portion 7 of the barrel and forwardly of the sear guideway 56 thereby forming a gripping portion 70 which surrounds the trigger linkage guideway 57. The aperture 69 is sized to provide entry for the hand of a person using the crossbow structure 1.

In using a crossbow structure constructed as described herein, a bow 9 having the desired strength for firing the selected weight and diameter arrow is mounted at the muzzle end 8 by engaging the flange 36 in the notch 35 and installing the bolts or screws 37. The bow string 10 is then inserted through the longitudinal slots 11 and 12 whereby it extends transversely of the bore 6 and the bow string 10 is secured to the opposite ends 43 and 44 of the bow with a suitable string length therebetween to provide the desired initial tension therein and pull for the bow. Prior to moving the bow string 10 rearwardly the cam safety 52 is disengaged from the notch 51 of the trigger member 48 and the safety pin 67 is positioned to allow the sear flange 60 to move through the notch or recess 68 in the safety pin 67. The butt portion 4 may then be placed against any suitable obstruction for application of substantial force to the bow string 10 for moving same rearwardly through the slots 11 and 12 to move over the beveled upper end 63 of the sear 45. The bow string 10 is then pulled rearwardly toward the breech portion 7 of the bore 6 and slots 11 and 12 and the sear 45 partially moved downwardly against the force of the resilient member 64 so that the string 10 will cam up and over the beveled upper end 63 of the sear 45 and be positioned and retained therebehind. The bow string 10 must be retained by the sear 45 during the loading of the selected arrow 2 and accidental release of the bow string prior to complete loading of the arrow would be ineffective in propelling the arrow. The resilient member or sear spring 64 then urges the sear 45 longitudinally upwardly into the upper bore portion 61 so that the bow string 10 is retained in a cocked position. The cam safety 52 and the safety pin 67 are then each moved into their nonfiring or safe positions engaging the trigger member 48 and the sear flange 60, respectively.

A head or forward end of the selected weight and diameter feathered arrow 2 is then inserted through the loading opening 32 of the breech and moved forwardly along the bore 6 as illustrated in FIG. 2 whereby the head passes through the forward end of the bow and is engaged by the forward arrow positioning member 17.

The arrow shaft 19 engages the beveled enlarged portion 33 of the slot 24 adjacent the forward end of the loading opening 32. The enlarged portion 33 and the rear end of the forward arrow positioning member 17 are grooved to cooperate in guiding the arrow into the bore 6 and into the channel or trough 18 in the forward arrow positioning member 17. The loading opening 32 is of substantially less length than the selected arrow 2 to be projected from the crossbow structure 1 and the length thereof permits the loading movement of the arrow and when the arrow is moved into the bore 6 the guide feathers will freely move through the opening to permit the rear portion of the shaft to drop into the trough or channel 18 in the rear arrow positioning member 16.

The arrow positioning members 16 and 17 are urged upwardly or toward the top of the bore 6 by suitable resilient members 72 and 73, respectively. The movement of the arrow positioning members 16 and 17 is confined to a vertical path by pins 74 and 75, respectively, extending into vertically extending slots 76 and 77 at the breech portion 7 and the muzzle end 8, respectively. The resilient members 72 associated with the rear arrow positioning members 16 raise same vertically to a position having the nock 31 just forwardly of the sear 45 and the rear recess 30 in a position extending transversely of the bore 6 and positioned in a plane defined by the bow string 10 so that when the bow string is released it will immediately move into the nick or recess 30. In this position, the outer portions or extremities 21 of the guide feathers or vanes 22 lightly rest on the lands or surfaces 20 to give stability to the arrow 2. The resilient members 72 associated with the rear arrow positioning member 16 and the resilient members 73 associated with the forward arrow positioning member 17 urge the arrow upwardly into engagement with the curved or arcuate surfaces 25 and 26 of the longitudinal slot 24 thereby providing guidance for the arrow when fired from the crossbow structure 1. The arrow supported in the channel or trough 18 of the arrow positioning members 16 and 17 and engaging the curved surfaces 25 and 26 of the bore 6 and the flange 36 is then ready for firing upon release of the safeties 52 and 67 and placing the butt end 4 against the shoulder of a person firing the crossbow structure so that the person can sight through the front and rear sights 13 and 14 to the target (not shown). The gripping portion 70 is grasped in such a manner that one finger engages a lower end of the trigger member 48 and when the structure 1 is properly aimed, said trigger lower portion is pulled rearwardly, driving the sear 45 downwardly, thereby releasing the bow string 10 which moves into engagement with the rear recess 30 in the nock of the arrow. The bow string then in its forwardly propelling movement supports the rear of the arrow 2 so that in the movement of the arrow forwardly through the bore 6, the guide feathers provide stability while the bow string is the main support that cooperates with the lands at the muzzle end for guiding the arrow as it is propelled from the bore. As the guide feathers move outwardly through the muzzle portion of the bore, the lateral and vertical portions are as illustrated in FIG. 11 so there is no interference in the launching of the selected arrow.

The structure illustrated and described permits the use of long conventional arrows that are more easily found after firing than are short darts. Also, it permits the interchange of a plurality of bows of different strengths for use with respective different weights and diameter arrows.

It is to be understood that, while I have illustrated and described one form of my invention, it is not to be limited to the specific form or arrangement of parts herein described and shown.

Claims

What I claim and desire to secure by Letters Patent is:

1. A crossbow structure for projecting a feathered arrow comprising:

a. a crossbow stock having an elongate barrel, said barrel having a longitudinal bore extending between a muzzle end and a breech portion of said barrel, said barrel having a loading opening therein communicating with said bore for receiving a feathered arrow therein;

b. a resiliently mounted arrow positioning means within said barrel adjacent the muzzle end of said bore for biasing an arrow upwardly in the bore and for supporting only the nocked portion of an arrow in a position to be discharged;

c. a resiliently mounted arrow positioning means within said barrel adjacent the breech portion of said bore for biasing an arrow upwardly in the bore and for supporting only the nocked portion of an arrow in a position to be discharged;

d. longitudinal slots formed at each side of said barrel and communicating with said bore, said slots extending between the muzzle end and the breech portion of said barrel;

e. a bow secured to said barrel adjacent the muzzle end thereof;

f. a bow string connected to opposite ends of said bow and extending through said slots for traveling therealong;

g. sear means within said barrel for selectively retaining and releasing said bow string; and

h. trigger means operatively engaging said sear means for effecting release of said bow string.

2. The crossbow structure as set forth in claim 1 wherein said sear means includes:

a. a sear guideway extending in a line transversely of the breech portion of the longitudinal slots and adjacent a rear end of the bore;

b. an elongate rod having a bevelled upper end movable within said sear guideway;

c. a flange adjacent a lower end of said sear rod, said flange being engaged by said trigger means for moving said rod; and

d. resilient means within said stock engaging said flange for urging said sear rod into a nonfiring position.

3. The crossbow structure as set forth in claim 2 including:

a. an elongate safety pin engageable with said sear flange for holding said sear rod in the nonfiring position;

b. a notch in said safety pin sized to permit said sear flange to move therethrough; and

c. keeper means engageable with said safety pin for selectively holding same in engagement with said sear flange and for holding said safety pin in position having said notch therein positioned to permit said sear flange to move therethrough.

4. The crossbow structure as set forth in claim 3 wherein:

a. said safety pin has a pair of longitudinally spaced recesses therein to receive said keeper means; and

b. said keeper means is a resilient member sized to be selectively received within said recesses in said safety pin.

5. The crossbow structure as set forth in claim 2 wherein said trigger means includes:

a. a trigger guideway within said stock communicating with said sear guideway;

b. a trigger member pivotally mounted within said trigger guideway, said trigger member having a lug portion extending therefrom; and

c. an elongate lever within said trigger guideway, said lever being pivotally mounted intermediate its ends and having one end engaging said lug portion of said trigger member and the other end engaging said sear flange for moving said sear out of engagement with said bow string.

6. The crossbow structure as set forth in claim 5 including:

a. a notch in an edge of said trigger member; and

b. a rotatably mounted cam safety positioned to be selectively moved into said notch whereby said cam safety engages and positions said trigger member in a nonfiring position.

7. The crossbow structure as set forth in claim 6 including:

a. resilient means engaging said trigger member and said trigger guideway for positioning said notch in said trigger member to receive said cam safety;

b. friction means associated with said cam safety for retaining same in an adjusted position; and

c. a recess in one side of said stock for said cam safety, said recess being sized to permit said cam safety to move between a safe position in said notch and a firing position out of said notch.

8. The crossbow structure as set forth in claim 7 wherein:

a. said trigger member is a planar member having a forward edge and a rear edge;

b. said notch is in said forward edge of said trigger member;

c. said lug portion of said trigger member extends rearwardly from said rear edge of said trigger member; and

d. said sear rod is positioned rearwardly of said trigger member.

9. A crossbow structure for projecting a feathered arrow comprising:

a. a crossbow stock having an elongate barrel, said barrel having a longitudinal bore extending between a muzzle end and a breech portion of said barrel, said barrel having a loading opening therein communicating with said bore for receiving a feathered arrow therein;

b. arrow positioning members within said barrel, a plurality of resilient means associated with said arrow positioning members whereby said arrow positioning members are biased upwardly to force different diameter arrows into engagement with the bore of the barrel;

c. guide means associated with said arrow positioning members for confining movement thereof to a path extending transversely of said bore;

d. longitudinal slots formed at each side of said barrel and communicating with said bore, said slots extending between the muzzle end and the breech portion of said barrel;

e. a bow secured to said barrel adjacent the muzzle end thereof;

f. a bow string connected to opposite ends of said bow and extending through said slots for traveling therealong;

g. a sear guideway extending in a line transversely of the breech portion of the longitudinal slots and adjacent a rear end of the bore;

h. a sear slidably mounted in said sear guideway and extendible across the breech portion of said slots to engage and retain said bow string when said bow is in bow-cocking position; and

i. trigger and linkage means operatively engaging said sear for linear retracting movement of said sear to release said bow string.

10. The crossbow structure as set forth in claim 9 including:

a. an aperture through said stock adjacent said breech portion, said aperture being sized to permit entry of at least a portion of one hand of a person using the crossbow structure; and

b. a gripping portion in said stock adjacent said trigger means, said gripping portion forming a portion of the surfaces defining said aperture.

11. The crossbow structure as set forth in claim 10 wherein said trigger and linkage means include:

a. a trigger linkage guideway within said gripping portion of said stock, said trigger linkage guideway communicating with said gear guideway;

b. a trigger member pivotally mounted within said trigger guideway, said trigger member having a lug portion extending therefrom; and

c. an elongate lever within said trigger linkage guideway, said lever being pivotally mounted intermediate its ends and having one end engaging said lug portion of said trigger member and the other end engaging said sear whereby movement of said trigger member is operative to move said sear out of engagement with said bow string.