KR101774406B1 - Compound bow to adjust let-off state - Google Patents

Compound bow to adjust let-off state Download PDF

Info

Publication number
KR101774406B1
KR101774406B1 KR1020160008308A KR20160008308A KR101774406B1 KR 101774406 B1 KR101774406 B1 KR 101774406B1 KR 1020160008308 A KR1020160008308 A KR 1020160008308A KR 20160008308 A KR20160008308 A KR 20160008308A KR 101774406 B1 KR101774406 B1 KR 101774406B1
Authority
KR
South Korea
Prior art keywords
cam
pulley
coupled
wing
state
Prior art date
Application number
KR1020160008308A
Other languages
Korean (ko)
Other versions
KR20170088485A (en
Inventor
이창호
박동원
Original Assignee
윈엔윈(주)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 윈엔윈(주) filed Critical 윈엔윈(주)
Priority to KR1020160008308A priority Critical patent/KR101774406B1/en
Publication of KR20170088485A publication Critical patent/KR20170088485A/en
Application granted granted Critical
Publication of KR101774406B1 publication Critical patent/KR101774406B1/en

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41B—WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR
    • F41B5/00—Bows; Crossbows
    • F41B5/10—Compound bows
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41B—WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR
    • F41B5/00—Bows; Crossbows
    • F41B5/10—Compound bows
    • F41B5/105—Cams or pulleys for compound bows
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41B—WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR
    • F41B5/00—Bows; Crossbows
    • F41B5/14—Details of bows; Accessories for arc shooting

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Flexible Shafts (AREA)
  • Mechanical Control Devices (AREA)

Abstract

A compound bow according to the present invention includes a bow body made of a pair of blades coupled to both ends of a handle, a pulley rotatably coupled to a rotary shaft formed at a rear end of each of the blades, and a cam A lower pulley assembly, a bowstring having both ends wound around respective pulleys of the upper and lower pulley assemblies, one end coupled to each of the pulley assemblies, the other end coupled to an opposite pulley assembly, Wherein the cam of each of the pulley assemblies includes a cam module movably coupled to a pulley on which the cam is engaged and a trajectory of an arc, One pulley assembly is provided with a wing-contact rotation stop pin coupled to a coupling hole formed in the pulley, and the other pulley assembly is formed with a pulley And an indicator connected to the guide hole is provided in the vicinity of each of the cam modules of the upper and lower pulley assemblies, and a let-off adjusting graduation display portion for adjusting the let- off state is formed around the cam modules of the upper and lower pulley assemblies, Off state can be adjusted by moving the respective cam modules and fixing the cam module to the desired position in the let-off adjusting scale display part with the fixing means.

Description

{COMPOUND BOW TO ADJUST LET-OFF STATE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compound bow, and more particularly, to a compound bow capable of adjusting the length of the knee with adjustment of the pulling length.

In general, the compound bow uses the effect of a cam or a wheel to pull easily when pulled without using a large force, and to increase the force of firing when firing, so that the speed of the arrow is fast, It is mainly used for hunting.

In such a compound bow, when the arm's richness is used by another person, it is necessary to adjust the pulling length of the bowstring in the state of let-off (state just before the arrow is fired) There is a need to increase the pulling length. In this case, the structure of the compound bow proposed by the present applicant (Patent No. 10-1418312, publication 2014.7.10) is shown in Figs. 1 to 3 so as to easily adjust the pulling length in the let-off state.

The compound bow shown in Figs. 1 to 3 includes a knob 102 gripped by a user, a bow body 100 composed of a pair of wings 103 formed at both ends of the knob 102, An upper and lower pulleys 110 rotatably coupled to a rotating shaft 101 formed at a rear end of the pulley 110 and a bowstring 140 having both ends wound around the pulleys 110, One end of the cam 200 is coupled to the pulley 110 to which the cam 200 is coupled so that the bow string 140 is wound on each cam 200 as the bow string 140 is pulled, Each of the cam cables 150 coupled to the opposite pulley 110.

The bow body 100 includes a handle 102 held by a user and a pair of limbs 103 joined to both ends of the handle 102 and each having a rear branch of two branches And at the rear end of the wing, a rotating shaft 101 is formed in which a pulley 110 is rotatably coupled between the two.

The pulley assembly coupled to the rear end of each wing 103 has the same structure and is coupled to the lower wing 103 with reference to the drawings. First, the upper and lower pulleys 103, And a fixing protrusion 111 for fixing one end of the bowstring 140 is formed on one side of each pulley 110. [ In addition, each of the pulleys 110 is formed with fixing projections 112 and 113 to which the respective cam cables 150 are fixed. A bowstring 140 is wound on a guide groove of each pulley 110 and is coupled to a fixing protrusion 111 formed at both ends of the pulley 110.

The cam cable 150 is formed between both ends of the compound bow body 100 and is wound on the cam 200 formed on each pulley 110 as the bowstring 140 is pulled, One end of the cam cable 150 is coupled to the fixing protrusion 112 and the other end of the cam cable 150 is connected to the pulley 110 to which the cam 200 is wound. And is fixed to the fixing protrusion 113 of the opposite pulley 110 after being wound on the rotary wheel 120 which is rotatably coupled to the rotary shaft 101 separately from the pulley 110. [

The cam 200 is formed in each pulley 110 and rotates together with the pulley 110. The cam 200 supports the cam cable 150 and the cam 200, Is coupled to the rotation shaft (221) at a predetermined angle from the cam cable support part (210) with a rotation shaft (221) at a position spaced from the rotation shaft (101) of the pulley (110) And a cam module 220 in which the cam cable 150 is wound on the cam cable support part 210 as the bowstring 140 is pulled on the outer circumferential surface and then wound on the outer circumferential surface sequentially.

The cam cable support part 210 is formed in an arc shape so that the cam cable 150 having one end connected to the fixing protrusion 112 located near the cam cable support part 210 is wound as the bowstring 140 is pulled And a reduction groove is formed on the outer peripheral surface thereof so that the cable 150 is wound.

The cam module 220 has a rotation shaft 221 at a position spaced a predetermined distance from the rotation axis 101 of the pulley 110 to be coupled and is rotatable with respect to the rotation shaft 221 by a predetermined angle from the cam cable support portion 210 And includes an eccentric portion 222 having a curved arc-like shape and a steeply inclined portion 223 extending from the eccentric portion 222 toward the rotary shaft 101 and forming a steeply inclined arc. Further, on the outer circumferential surfaces of the eccentric portion 222 and the steep slanting portion 223, a spiral groove around which the cam cable 150 is wound is formed. The cam module 220 rotates together with the pulley 110 as the bowstring 140 is pulled so that the cam cable 150 contacts the curved portion 222 of the cam module 220 adjacent to the cam cable support portion 210, And the steep winding portion 223 in order. The cam 200 also rotates the cam module 220 by a certain angle relative to the pivot axis 221 to adjust the draw length of the compound bow in the let-off state, And a fixing unit for fixing the fixing unit to the fixing unit. The fixing means is for fixing the cam module 220 to the pulley 110 at a rotated position by rotating the cam module 220 by a predetermined angle with respect to the pivot shaft 221. To this end, the cam module 220 is provided with a pivot shaft 221 And a coupling hole is formed in the pulley 110 to which the cam module 220 is coupled. Accordingly, when the cam module 220 is rotated about the pivot 221 by a predetermined angle and the coupling member 115 is coupled to the coupling hole formed in the pulley at a predetermined position of the position adjustment hole 230, Is fixed to the pulley 110. The bolt is inserted into the position adjusting hole 230 and then screwed into the coupling hole formed in the pulley 110 to fix the cam module 220 to the pulley 110. [ In addition, a number indicator 231 is formed around the position adjusting hole 230 to indicate the position where the cam module 220 is fixed. The cam module 220 coupled to the upper and lower pulleys 110 must have the same rotation angle and the position indicator 231 is numerically displayed so that the rotation angle of one cam module 220 can be known.

As an additional fixing means, an engaging hole 225 is formed in the cam module 220 and an arc-shaped position adjusting hole 116 is formed in the pulley 110 around the rotating shaft 221, The cam module 220 is fixed to the pulley 110 by the engagement member of the cam member 220. [

In order to adjust the pulling-off length of the compound-bow in the above-described compound bow, after removing the bolts coupled to the position adjusting hole 230 of the cam module 220, The cam module 220 is rotated at a predetermined angle around a pivot 221 formed at a position spaced apart from the rotation axis 101 of the cam module 220 as shown in FIG. Is fixed to the pulley 110. At this time, the cam modules 220 coupled to the upper and lower pulleys 110 move at the same rotation angle.

3, when the cam module 220 is rotated around the pivot shaft 221 by a predetermined angle from the cam cable support portion 210 and the cam module 220 is fixed to the pulley 110 again at the rotated position, The length of the cam cable 150 wound on the curved portion 222 of the cam module 220 is increased compared with the case where the cam cable 150 is extended from the cam cable support portion 210 to the cam module 220, The winding length is increased and the pulling length is eventually increased.

However, when the upper and lower pulley assemblies 107 and 108 can not be brought into the off-state simultaneously in the let-off state, it is difficult to precisely adjust the pull-off length, That is, there is a disadvantage that the user can not control the force applied to maintain the let-off state in the let-off state.

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the drawbacks of the prior art as described above, and it is an object of the present invention to provide a pulley- Which can be easily adjusted.

The knee adjustable compound bow according to the present invention comprises a knob having a grip portion formed at the center thereof, a bow main body composed of a pair of blades coupled to both ends of the knob, and a rotary shaft formed at a rear end of each of the blades, An upper and lower pulley assemblies including a pulley coupled to the pulleys and a cam coupled to one side of the pulleys and rotating together with the pulleys; a bowstring having both ends wound on respective pulleys of the upper and lower pulley assemblies; And first and second cam cables coupled to the pulley assemblies at the other end and wound on the cams of the respective pulley assemblies as the bowstring is pulled, A cam module movably coupled to a pulley to which the cam is coupled in a locus of an arc, And a fixing means for fixing the cam module to the pulley at a desired position, wherein one pulley assembly is coupled to a coupling hole formed in the pulley, and the bowstring is pulled so that the one pulley assembly is engaged And the other pulley assembly is coupled to a guide hole formed in the pulley so that the bowstring can be engaged with the second cam cable in the guide hole before being contacted with the second cam cable as the bowstring is pulled, And an indicator that rotates together with the pulley assembly while maintaining a predetermined position, and then moves in contact with the second cam cable and into the guide hole until the take-off state is established. In the vicinity of each cam module of the upper and lower pulley assemblies, A knee-cap adjusting dial display portion for adjusting the knee-opening rotation speed of the wing- Off state can be adjusted by moving the respective cam modules while keeping the position of the spindle and fixing the cam module to the desired position in the let-off adjusting scale display part by the fixing means.

Wherein the cam of each of the pulley assemblies further comprises a cam cable support portion on which a cam cable is supported by a pulley to which the cam is coupled so that the cam cable is supported by the cam cable support portion as the bowstring is pulled, As shown in Fig.

The cam module is rotatably coupled with the cam cable support part at a predetermined angle around a pivot point at a position spaced from the rotation axis of the pulley by a predetermined distance.

In addition, an arc-shaped position adjusting hole is formed in the pulley to which the cam module is coupled, and the cam module is movably coupled to the pulley along the position adjusting hole.

In addition, a position indicator for indicating a position where the indicator moves in contact with the second cam cable is formed around the guide hole to which the indicator is coupled.

In addition, the engagement hole has a predetermined length and the wing-contact rotation stopping pin is coupled to an arbitrary position in the engagement hole.

In addition, a position indicator for indicating the position of the wing-contact rotation stop pin is formed around the engagement hole to which the wing-contact rotation stopping pin is coupled.

According to the present invention, a compound bow is provided, which facilitates tuning of the upper and lower pulley assemblies and can adjust the liftoff state with adjustment of the pulling length.

1 is a view of a conventional compound bow,
FIG. 2 is a view of a pulley assembly coupled to a lower blade in FIG. 1
FIG. 3 is a view showing a state in which the cam module is rotated in the compound bow of FIG. 1,
4 is a view showing a compound bow according to the present invention,
Figure 5 is a top pulley assembly coupled to the upper blade in Figure 4,
FIG. 6 is a side view of the upper side pulley assembly in FIG. 5,
Figure 7 is a view of the lower pulley assembly coupled to the lower blade in Figure 4,
FIG. 8 is a view showing a state in which a straight line is pulled in a compound bow in FIG. 4,
FIG. 9 is a detailed view of the upper and lower pulley assemblies in FIG. 8,
FIG. 10 is a view showing the upper and lower pulley assemblies when the let-off state is adjusted in FIG. 8. FIG.

Hereinafter, a compound bow according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 4 shows a compound bow according to the present invention, FIG. 5 shows an upper pulley assembly coupled to the upper blade in FIG. 4, and FIG. 6 shows the opposite side of the upper pulley assembly in FIG. Fig. 7 is a view showing a lower side pulley assembly coupled to a lower blade in Fig. 4, Fig. 8 is a view showing a state when a ramp is pulled in a compound bow in Fig. 4, And FIG. 10 is a view showing the upper and lower pulley assemblies when the let-off state is adjusted in FIG. 9. FIG.

A compound bow capable of adjusting the let-off state according to the present invention includes a bow body 300 to which wings 303 are respectively coupled to both ends of a handle 302, a rotary shaft 301 formed at a rear end of each wing 303, Upper and lower pulley assemblies 307 and 308 including a pulley 310 rotatably coupled to the pulley 310 and a cam coupled to one side of each pulley and rotating together with the pulley 310, The bowstrings 340 are wound around the pulleys 310 of the pulleys 307 and 308 and the first and second pulleys 310 and 308 wound on the cams 400 of the pulley assemblies 307 and 308 as the bowstring 340 is pulled. A second cam cable 150a and 150b and a wing-contact rotation stop pin 500 in contact with one wing 303 to which the one pulley assembly 307 is engaged in a re-off state, and another pulley assembly 308 And an indicator 600 moving in contact with the second cam cable 352 in a guide hole 603 formed in a pulley 310 And the cam module 420 is moved around the cam module 420 of the upper and lower pulley assemblies 307 and 308 to fix the cam module 420 at a desired position with fixing means to adjust the let- And display portions 700 and 710 are formed.

Each of the components of the compound bow according to the preferred embodiment of the present invention will be described in detail. First, the bow main body 100 includes a handle 302 having a grip formed at the center thereof by a user, And a pair of limbs 303 connected to both ends of the wing 303 and having a rear portion formed of two branches and a pulley assembly 307 and 308 disposed between the two at the rear end of the wing 303 A rotary shaft 301 rotatably coupled is formed. A cable guard 305 for pushing the first and second cam cables 351 and 352 to one side of the bowstring 140 is coupled to the center of the handle 302 so that the arrow is not disturbed when the arrow is fired.

The upper and lower pulley assemblies 307 and 308 are rotatably coupled to the rotary shaft 301 at the rear end of each of the blades 303. The upper and lower pulley assemblies 307 and 308 have similar structures A pulley 310 rotatably coupled to a rotating shaft 301 formed at a rear end of each wing 303 and a cam 400 coupled to one side of the pulley 310 and rotated together with the pulley 310, ).

The pulley 310 has an elliptic plate shape and an eccentric through hole is formed at the center of the pulley 310 so that the rotary shaft 301 is engaged. The outer circumferential surface of each pulley 310 is formed with a guide groove recessed to a predetermined depth so that the bowstring 340 can be wound. A bowstring 340 wound on a guide groove is formed on one side of each pulley 310, A fixing protrusion 311 for fixing one end of the fixing protrusion 311 is formed. Each of the pulleys 310 is formed with a fixing protrusion 312 to which the cam cables 351 and 352 are fixed.

The cam 400 is formed in each of the pulleys 310 and rotates together as the pulley 310 rotates. The cam 400 supports the cam cable 351 and the cam cable 351, The cam ring 400 is coupled to the cam cable support 410 so as to be rotatable about the pivot point A at a predetermined distance from the rotation axis 301 of the pulley 310 coupled to the cam ring 400, And a cam module 420 in which a cam cable retraction groove is formed on the outer circumferential surface and the cam cable 351 or 352 is wound on the cam cable support portion 410 as the bowstring 340 is pulled and then wound on the outer circumferential surface sequentially.

The cam 400 also rotates the cam module 420 about the pivot point A by a predetermined angle to adjust the pull length of the compound bow in the let-off state, 310). ≪ IMAGE >

The cam cable support portion 410 is formed in an arc shape so that the cam cables 150a and 150b having one end coupled to the fixing protrusion 112 located near the cam cable support portion 410 are wound as the bowstring 340 is pulled And on the outer circumferential surface thereof, a spiral groove around which the cable cables 150a and 150b are wound is formed.

The cam module 420 is mounted on the pulley 310 such that the cam module 420 is rotatable from the cam cable support part 410 by a predetermined angle about the pivot point A at a position spaced from the rotation shaft 301 of the pulley 310 And includes an eccentric portion 422 having a curved arc-like shape and a steeply inclined portion 423 extending from the eccentric portion 422 so as to be close to the rotary shaft 301 and forming a steep slope. Further, on the outer circumferential surfaces of the eccentric portion 422 and the steep slanting portion 423, a spiral groove around which the cam cables 351 and 352 are wound is formed. As the bowstring 340 is pulled, the cam module 420 rotates together with the pulley 310 so that the cam cables 351 and 352 are engaged with the eccentric portion 422 of the cam module 420 adjacent to the cam cable support portion 410, And the steep slope part 423 are sequentially wound.

The fixing means is for rotating the cam module 420 about the pivot point A by a predetermined angle and fixing the cam module 420 to the pulley 310 at a rotated position. And a bolt 317 is coupled to the two bolt holes formed at predetermined positions of the cam module 420. The bolt 317 is engaged with the pulley 310 Shaped coupling hole 316 formed in the coupling portion 316 and the nut is coupled to one end of the bolt 317 to fix the cam module 420 to the pulley 310. [

In addition, a numeral indicating portion 425 is formed at the edge of the cam module 420 to indicate the position where the cam module 420 is fixed. The location display unit 425 may be formed of alphanumeric characters instead of numbers.

In the present invention, the upper and lower cam modules 420 have such a configuration to adjust the pulling length of the bowstring 340. The cam modules 420 of the upper and lower pulley assemblies 307 and 308 are rotated The first cam cable 351 and the second cam cable 352 are rotated by the same angle from the cam cable support portion 410 about the point A and the cam module 420 is fixed to the pulley 310 again at the rotated position The winding length of the winding part 422 of the cam module 420 is increased so that the length of the first and second cam cables 351 and 352 is reduced from the cam cable support part 410 to the cam module 420 And the pulling length is eventually increased.

A bowstring 340 is wound on a guide groove of a pulley 310 of each of the pulley assemblies 307 and 308 and is coupled to a fixing protrusion 311 formed at both ends of the pulley 310.

The first and second cam cables 351 and 352 are formed between the pair of blades 303 of the bow body 300 and are formed in the respective pulleys 310 as the bowstring 340 is pulled The second cam cable 352 is wound around the cam 400 so that one end of the second cam cable 352 is coupled to the rotating shaft 301 of the upper pulley assembly 307 in the form of a buss cable and the other end is connected to the lower pulley assembly 308 Of the lower pulley 310 so as to be wound on the cam 400 of the lower pulley 310.

One end of the first cam cable 351 is coupled to the fixing protrusion 312 formed on the pulley 310 of the upper pulley assembly 307 and extends to the lower pulley assembly 308 to be formed on the lower pulley 310 The other end of the first cam cable 350a is fixed to the fixing protrusion 325 formed in the vicinity of the cam cable winding portion 320 after being wound around the cam cable winding portion 320 through which the rotating shaft 301 passes

The cam cable winding portion 320 is formed on one side of the lower pulley 310 to which the cam module 420 is coupled and is formed around the rotating shaft 301. The rotating shaft 301 passes through the center, (351) is wound, and a part of the outer circumferential surface is formed in an arc shape.

4 and 7, the indicator 600 is rotated in the guide hole 603 formed in the pulley 310 of the lower pulley assembly 308, The indicator 600 is moved in contact with the cable 352. The indicator 600 has a contact protrusion portion and a support portion which are connected to each other by two coupling members having a predetermined length along the guide hole 603 on both sides of the guide hole 316, . One of the two engaging members is a bolt for detachably connecting the contact protruding portion and the supporting portion, and the other is an engaging pin formed on the supporting portion separated from the bolt along the guide hole. Therefore, bolt holes and pin holes for engaging the bolts and the engaging pins are formed at the contact protrusions at predetermined intervals along the guide holes 603, and the bolt holes to which the bolts are engaged are formed with female threads. The supporting portion is formed with a coupling pin inserted into the pinhole of the contact projection portion, and a bolt hole is formed in which the bolt is engaged at a position spaced apart from the coupling pin.

A contact rubber pad, which is inserted into the guide hole 603 and contacts the inner circumferential surface of the guide hole 603, is provided between the contact protrusion part of the indicator 600 and the support part. The contact rubber pad is inserted between the bolt and the engaging pin, which are two engaging members in the guide hole 603, so that the guide rubber pad is inserted into the guide hole 603 before the indicator 600 contacts the second cam cable 352, So that the indicator 600 moves smoothly in the guide hole 603 when the second cam cable 352 is in contact with the second cam cable 352. The guide hole 603 to which the indicator 600 is coupled is formed in an arc shape with the rotation axis 301 as the center.

The indicator 600 is configured such that the indicator 600 is rotated in the initial state in which the bowstring 340 is pulled as shown in Figures 4 to 7 while the indicator 600 is in the engaged position in the guide hole 603, When the contact protruding portion of the indicator 600 contacts the second cam cable 352, the indicator 600 is pushed by the second cam cable 352 as the pulley 310 rotates and the guide hole 603 (See FIG. 9). Thus, the indicator 600 is coupled to the guide hole 603 to such an extent that it can move in contact with the second cam cable 352. A position indicator 604 is formed around the guide hole 603 to indicate the position of movement of the indicator 600 in the guide hole 603. The location display unit 604 is composed of a plurality of lines and numbers spaced apart at regular intervals, but may be composed of alphanumeric characters instead of numbers. Of course, the indicator 600 may be fixed in the guide hole 603 with a bolt at a position where the indicator 600 is positioned in the guide hole 603 in the let-off state.

5, the wing-contact rotation stop pin 500 has a predetermined length of an arcuate shape and is formed at an arbitrary position of the engagement hole 503 formed in the pulley 310 of the upper side pulley assembly 308, When the Bowstring 340 is pulled out, that is, when the Bowstring 340 is in the let-off state (the firing state of the arrow) And comes into contact with the upper blade 303 (see Fig. 9). The wing-contact rotation stop pin 500 includes a contact protrusion portion and a support portion which are in contact with the wing 303 like the indicator 600 and are coupled to each other by bolts on both sides of the engagement hole 503 . The contact protrusions and supports of the wing-contact rotation stop pin 500 are similar to those of the indicator 600 described above, and a detailed description thereof will be omitted here.

As described above, in the present invention, the cam module 420 of each of the pulley assemblies 307 and 308 can be rotated about the pivot point A from the cam cable support portion 410 by a predetermined angle In this case, as the cam module 420 moves, the rotation angle of each of the pulleys 310 is varied in the let-off state, so that the position of the wing-contact rotation stop pin 500 is also moved accordingly. At this time, the bolt for coupling the wing-contact rotation stop pin 500 to the engagement hole 503 is loosened and the wing-contact rotation stop pin 500 is disengaged from the engagement hole The wing-contact rotation stop pin 500 is fixedly coupled to the engagement hole 503 (in the present embodiment, the wing-contact rotation stop pin 500 is moved to the position display portion 504) is fixed to 2 in the number). The engagement hole 503 in which the wing-contact rotation stopping pin 500 is moved is formed in an arc shape centering on the rotation shaft 301 and is engaged with the engagement hole 503 503, a position indicating portion 504 is formed (see Fig. 6). In the present embodiment, the location display unit 504 is composed of a plurality of lines and numbers spaced apart at regular intervals, but may be composed of alphanumeric characters instead of numbers.

The let-off adjustment scale display units 700 and 710 are for adjusting the let-off state, that is, for regulating the force that the operator keeps the let-off state during let-off. 7, in the periphery of the cam module 420 of the upper and lower pulley assemblies 307 and 308, a let-off adjusting scale display unit 700 and 710 for adjusting the let-off state are formed and the cam module 420, So that the let-off state can be adjusted by fixing it to the desired position in the let-off adjusting scale display units 700 and 710 by the fixing means.

Hereinafter, the operation of the compound bow according to the preferred embodiment of the present invention will be described.

The cam module 420 of the upper and lower pulley assemblies 307 and 308 is moved from the cam cable support portion 410 to the same position And the cam module 420 is fixed to the pulley 310 again at the rotated position, so that the desired pulling length can be adjusted. 4 to 7, the cam module 420 of the upper and lower cams 400 is aligned to 2 in the position display portion 425 and the upper cam 400 is rotated in the same direction as the position indicator 425 of the upper cam module 420, 2 is set to the numeral 80 of the ruled-off adjusting scale display part 710 in the upper cam 425 and 2 is set in the position indicating part 425 of the lower cam module 420 in the lower cam 400 as shown in Fig. (700). In addition, since the rotation angle of each pulley 310 varies in the off-state according to the movement of the cam module 420, the position of the blade-contact rotation stop pin 500 should be moved accordingly. At this time, the bolt for coupling the wing-contact rotation stop pin 500 to the engagement hole 503 is loosened and the wing-contact rotation stop pin 500 is disengaged from the engagement hole 503 of the position indicator 504 as shown in FIG. 6, and then the wing-contact rotation stop pin 500 is fixedly coupled to the engagement hole 503.

The desired pulley length is then adjusted so that the indicator 600 in the lower pulley assembly 308 is positioned such that it is positioned at one end of the guide hole 603 (toward the front end in the direction in which the pulley rotates) do. When the Bowstring 340 is pulled in this state, the position of the indicator 600 in the guide hole 603 is maintained to be rotated together with the rotation of the pulley 310 and the indicator 600 is rotated together with the second cam cable The indicator 600 is pushed by the second cam cable 352 and moved in the guide hole 403 as the pulley 310 continues to rotate.

At the same time, the wing-contact rotation stop pin 500 formed on the upper side pulley assembly is fixedly coupled in the coupling hole 503 and rotates together with the pulley 310 while maintaining its position, and the upper wing 303 So that the pulley 310 is no longer rotated.

The state of the bow when the bowstring 340 is pulled in this way, that is, when the bowstring 340 is in the pot-off state capable of firing an arrow, is shown in Fig. 7 is a view of a compound bow when the bowstring 340 is pulled when the angles of rotation of the cams 400 of the upper and lower pulley assemblies 307 and 308 are the same. In this case, 2 in the position display unit and coincides with the position of the wing-contact rotation stop pin 500. The indicator 600 is formed to move in the guide hole 603 only by the contact of the cam cable 352 and maintains the same position after releasing the bowstring 340 so that the bowing user moves the bowstring 340 It is confirmed that the rotation angle of the upper and lower cams 400 is the same by confirming that the position where the indicator 600 is moved in the guide hole 603 after the release is coincident with the position of the blade- .

However, due to the difference in the strength of the blades, the angle at which the upper and lower cams 400 rotate can be changed to the let-off state. In this case, the moving position of the indicator 600 is determined by the position . In this case, the bow user adjusts the length of the first cam cable or the second cam cable 351 or 352 by comparing the position of the indicator 600 with the position of the wing-contact rotation stop pin 500, So that the rotation angles can be adjusted to be the same.

In addition, in the present invention, the force for maintaining the let-off state, that is, the let-off state can be adjusted. FIG. 10 shows an example in which the let-off state is adjusted. 9 is a state in which the numeral 2 of the position display section 425 in the upper and lower cam modules 420 indicates 80 in the let-off adjusting scale display sections 700 and 710. In Fig. In the state as shown in FIG. 9, it means that the force for pulling the Bowstring by the bow user is reduced by 80% compared to that before the LeftOff when the legoff state is established. In this case, when the bow user desires to adjust the let-off state to 60%, the position of the wing-contact rotation stop pin 500 of the upper side pulley assembly 307 is fixed within the engagement hole 503, (420) are moved to indicate 60 in the numerical-2 carry-off adjusting scale display unit (700, 710) of the position display unit (425). 10, the upper and lower cam modules 420 are moved to point to 60 in the let-off adjustment scale display units 700 and 710, and then the bowstring is pulled to indicate the let-off state. In Fig. 10, the second cam cable 352 is moved away from the rotary shaft 301 (see the lower cam module 420), and thereby the let-off state is changed to 60%. That is, the position of the wing-contact rotation stop pin 500 is not changed, so that the let-off state can be adjusted while the pull-in length is maintained.

In general, the bow user is aiming the target in the off-off state. In the bow user having different forces, it is important to adjust the let-off state in order to improve the accuracy of the arrow. In the present invention, Off state can be easily adjusted.

Accordingly, the present invention can adjust the pull-off state together with the adjustment of the pulling length, so that the bow user having different forces and different arm length adjusts the pulling length and the releasing state suitable for him, So that the accuracy of the arrow can be further increased.

Meanwhile, in the embodiment of the present invention, although the cam cable coupling structure is applied to the hybrid system, it may be applied to a classical dual cam structure.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. It will be readily understood.

300: Bow main body 301:
302: handle 303: wing
310: Pulley 311: Fixing projection
340: Bowstring 351, 352: 1st and 2nd cam cables
400: cam 410: cam cable support
420: cam module 500: wing contact rotation stop pin
600: Indicators 700, 710: Legoff adjustment graduation indicator

Claims (7)

A knob having a grip formed at the center thereof, a bow body made of a pair of wings coupled to both ends of the knob,
An upper and a lower pulley assembly including a pulley rotatably coupled to a rotary shaft formed at a rear end of each of the blades, and a cam coupled to one side of the pulleys and rotating together with the pulley,
A bowstring, both ends of which are wound around respective pulleys of the upper and lower pulley assemblies,
And first and second cam cables coupled to the pulley assemblies at one end and coupled to the pulley assemblies at the other end to be wound on the cams of the pulley assemblies as the bowstring is pulled,
Wherein the cam of each of the pulley assemblies is movably coupled to a pulley to which the cam is coupled in a trajectory of an arc and a cam module for fixing the cam module to the pulley at a desired position to adjust the pull- And a fixing means,
Wherein one pulley assembly is provided with a wing-contact rotation stop pin which is coupled to a coupling hole formed in the pulley and in which the bowstring is pulled and brought into contact with one wing to which the one pulley assembly is engaged in the off-
The other pulley assembly is coupled to the guide hole formed in the pulley and rotates together with the pulley assembly while maintaining the engaged position in the guide hole before the bowstring is pulled in contact with the second cam cable, And an indicator that moves in contact with the guide hole to the let-off state,
A lift-off adjusting graduation display portion for adjusting the lift-off state is formed around each of the cam modules of the upper and lower pulley assemblies to move the cam modules while maintaining the position of the wing- Off state is adjustable by fixing the cam module to a desired position in the let-off adjusting scale display part by the fixing means. The method according to claim 1,
Wherein the cam of each of the pulley assemblies further comprises a cam cable support portion on which a cam cable is supported by a pulley to which the cam is coupled so that the cam cable is supported by the cam cable support portion as the bowstring is pulled, , And a compound bow which can be adjusted in a leg-off state 3. The method of claim 2,
Wherein the cam module is rotatably coupled to the cam cable support part at a predetermined angle around a pivot point at a position spaced a predetermined distance from the rotation axis of the pulley. The method of claim 3,
Wherein a pulley to which the cam module is coupled is formed with an arcuate position adjusting hole and the cam module is movably coupled to the pulley along the position adjusting hole. The method according to claim 1,
And a position indicator for indicating a position at which the indicator moves in contact with the second cam cable is formed around the guide hole to which the indicator is coupled. The method according to claim 1,
Wherein the engaging hole has a predetermined length and the wing-contacting rotation stopping pin is engaged at an arbitrary position within the engaging hole. The method according to claim 6,
And a position indicator for indicating the position of the wing-contact rotation stop pin is formed around the engagement hole to which the wing-contact rotation stopping pin is coupled.
KR1020160008308A 2016-01-22 2016-01-22 Compound bow to adjust let-off state KR101774406B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020160008308A KR101774406B1 (en) 2016-01-22 2016-01-22 Compound bow to adjust let-off state

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020160008308A KR101774406B1 (en) 2016-01-22 2016-01-22 Compound bow to adjust let-off state

Publications (2)

Publication Number Publication Date
KR20170088485A KR20170088485A (en) 2017-08-02
KR101774406B1 true KR101774406B1 (en) 2017-09-05

Family

ID=59651994

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020160008308A KR101774406B1 (en) 2016-01-22 2016-01-22 Compound bow to adjust let-off state

Country Status (1)

Country Link
KR (1) KR101774406B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102005194B1 (en) * 2018-09-11 2019-10-02 이창호 Bow that can shoot an arrow strongly with a small force

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101418312B1 (en) 2013-08-19 2014-07-10 윈엔윈(주) Cam structure of compound bow to adjust draw length easily

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101418312B1 (en) 2013-08-19 2014-07-10 윈엔윈(주) Cam structure of compound bow to adjust draw length easily

Also Published As

Publication number Publication date
KR20170088485A (en) 2017-08-02

Similar Documents

Publication Publication Date Title
KR101657676B1 (en) Compound bow to adjust draw length
US9261321B2 (en) Self-tunable compound bow
US8082910B1 (en) Pulley assembly for a compound archery bow
US4261320A (en) Compound bow
US6516790B1 (en) Single-cam compound archery bow
USRE47036E1 (en) Cable guard system for archery bows
US4337749A (en) Compound bow
US9803683B2 (en) Pivotable sheath stop for a sheath, and corresponding bracket, guide rail, assembly, window lift, and mounting method
US5529049A (en) Pivotally adjustable arrow rest
US8307816B2 (en) Compound archery bow with non-linear cable guide
RU2013138871A (en) SURGICAL PURPOSE DEVICE
KR101774406B1 (en) Compound bow to adjust let-off state
US8776772B1 (en) Accessory for an archery bow
US4071014A (en) Arrow positioning device
US9335114B2 (en) Self-tunable compound bow
KR101418312B1 (en) Cam structure of compound bow to adjust draw length easily
CA3033037C (en) Adjustable pulley assembly for a compound archery bow
KR101362051B1 (en) Self-tunable compound bow
US8851057B2 (en) Bow press
US6659096B1 (en) Split-buss-cable single-cam compound archery bow
US20150119969A1 (en) Unit and device having a unit for positioning a prosthetic component
MX2014003211A (en) Retained aligning rotating hack saw blade tensioning mechanism and related method.
US10393485B1 (en) Mechanical broadhead
US3728789A (en) Wire stripper
KR101373824B1 (en) Self-tunable compound bow

Legal Events

Date Code Title Description
A201 Request for examination
E701 Decision to grant or registration of patent right
GRNT Written decision to grant