US20150053191A1 - Compound bow - Google Patents
Compound bow Download PDFInfo
- Publication number
- US20150053191A1 US20150053191A1 US14/465,281 US201414465281A US2015053191A1 US 20150053191 A1 US20150053191 A1 US 20150053191A1 US 201414465281 A US201414465281 A US 201414465281A US 2015053191 A1 US2015053191 A1 US 2015053191A1
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- United States
- Prior art keywords
- pulley
- cam
- coupled
- cable
- support
- Prior art date
- Legal status (The legal status 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 status listed.)
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- 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
- F41B5/10—Compound bows
Definitions
- the present invention relates to a compound bow, and more particularly, to a compound bow which can prevent distortion of the bow and improve accuracy of an arrow when a bowstring is pulled.
- compound bows are configured so that a bowstring may be easily pulled without using a large force and arrow shooting power is increased during shooting, by using an effect of a cam or wheel, to thus result in a fast speed of an arrow and have very strong power, and are widely used mainly for hunting.
- a conventional compound bow is configured to have upper limbs 20 that are coupled to the upper portion of a handle 10 at the center of which a grip portion is formed, and lower limbs 26 coupled to the lower portion of the handle 10 .
- a cut-out portion 21 is formed between the upper limbs 20 whose edges 22 are spaced apart from each other, and a cut-out portion 27 is formed between the lower limbs 26 whose edges 28 are spaced apart from each other.
- Rotating shafts 70 are horizontally formed through the edges 22 of the upper limbs 20 and the cut-out portion 21 , and through the edges 28 of the lower limbs 26 and the cut-out portion 27 , respectively.
- Upper and lower pulleys 30 and 36 are rotatably combined with the respective rotating shafts 70 .
- a bowstring 50 is wound along a guide groove 31 or 37 of each pulley 30 or 36 , and the respective ends of the bowstring 50 are combined with each pulley 30 or 36 .
- a cam 32 or 38 rotating with the pulley 30 or 36 is coupled in each pulley 30 or 36 .
- cam cables 40 and 46 are formed so as to be wound on the cams 32 and 38 , respectively.
- each cam cable 40 or 46 is coupled to a pulley 30 or 36 to which each cam 32 or 38 is coupled, and the other end of each cam cable 40 or 46 is coupled to each rotating shaft 70 at both sides of the cut-out portion 21 or 27 of each of the opposing limbs 20 and 26 in the form of Y-shaped buss cables 40 a and 46 a.
- a cable guard 60 is laterally mounted at one side of a center portion of a handle 10 , in which the cable guard 60 pushes the cam cables 40 and 46 to one side of the bowstring 50 so that an arrow is not prevented from being shot during shooting.
- a slide 66 is movably mounted on the cable guard 60 in which the cam cables 40 and 46 are inserted into the slide 66 .
- the cam cables 40 and 46 which are located in front of the bowstring 50 from interfering with the shooting of an arrow in the compound bow, the cam cables 40 and 46 are compulsively supported in one direction by the cable guard 60 and the cams 32 and 38 are combined on an identical one side surface of the respective pulleys 30 and 36 . Therefore, the pulleys 30 and 36 around which the bowstring 50 is wound are not located at the center of each of the limbs 20 and 26 as shown in FIG. 2 . Accordingly, when the bowstring 50 is pulled, the bow limbs 20 and 26 and pulleys 30 and 36 are twisted as shown in FIG. 3 . As a result, the inherent strength of the bow is not exhibited and the accuracy of the arrows is also dropped.
- buss cables 40 a and 46 a are adjusted with a tool to thereby control the bow limbs to be inclined to the left and right, it is very difficult to adjust the buss cables 40 a and 46 a for the left and right balance of the bow limbs 20 and 26 except for a person who has a skill of adjustment of the buss cables 40 a and 46 a , due to difference of the forces applied on the limbs when compared with an initial state of the limbs when the bowstring 50 is pulled.
- a compound bow comprising: a bow main body including a handle at a central portion of which a grip portion is formed and a pair of limbs that are respectively coupled to both ends of the handle; upper and lower pulley assemblies each including a pulley that is rotatably coupled to a rotating shaft formed on the rear end of each limb, and a cam that is coupled to one side of the pulley and rotating with the pulley; a bowstring whose either end is wound and coupled to the pulley of each of the upper and lower pulley assemblies; and two cam cables that are wound around the cam of each of the upper and lower pulley assemblies as the bowstring is pulled, in which one end of each of the two cam cables is coupled to one of the upper and lower pulley assemblies, and the other end thereof is coupled to the other of the upper and lower pulley assemblies or the rotating shaft of the other of the upper and lower pulley assemblies; wherein at least one of
- the rotating wheel is rotatably coupled to the rotating shaft separately from the pulley.
- the support member of the cam cable guide member comprises a guide pulley and a support pulley that are respectively rotatably coupled to two shaft members respectively located at both sides of the cam cable, in which the cam cable is supported between the guide pulley and the support pulley.
- a guide groove for guiding the cam cable is formed on an outer circumferential surface of the guide pulley.
- the support pulley is formed at the front of the guide pulley, and is located at a longer distance from the rotating shaft of the cam cable guide member than the guide pulley.
- the support pulley is formed to have an outer diameter of an outer circumferential surface of the support pulley that guides the cam cable in contact with the cam cable becomes smaller inwards, and thereby guide the cam cable to a cable guard that is coupled to the handle of the bow main body and pushes the cam cable in one direction.
- the compound bow further comprises a support bar one end of which is rotatably coupled to the rotating shaft separately from the pulley at the other side surface of the pulley to which the cam cable guide member is coupled, so as to oppose the cam cable guide member, and at the other end of which two support protrusions are formed for supporting each of the guide pulley and the pulley support of the cam cable guide member.
- two coupling portions to which the rotating shaft is coupled are formed at one end of the cam cable guide member, in which the two coupling portions are coupled to the rotating shaft at both sides of one of two branches adjacent to the rotating wheel of the two branches that form a rear portion of the limbs, and the cam cable guide member is made in an arch-shaped form.
- the present invention provides a compound bow to prevent twisting of the bow during use, to exhibit inherent strength of the bow, and to improve synchronizing to thus improve accuracy of an arrow.
- FIG. 1 is a perspective view of a conventional compound bow.
- FIG. 2 is a rear view of the compound bow of FIG. 1 .
- FIG. 3 is a perspective view showing a twisted state of a pulley assembly coupled to a limb of FIG. 1 .
- FIG. 4 is a side view showing a compound bow according to a first embodiment of the present invention before a bowstring is pulled.
- FIG. 5 is a detailed view of a pulley assembly that is coupled to one of limbs in FIG. 4 .
- FIG. 6 is a side view showing a compound bow according to the first embodiment of the present invention after a bowstring has been pulled.
- FIG. 7 is a detailed view of a pulley assembly that is coupled to one of limbs in FIG. 6 .
- FIG. 8 is a side view of the pulley assembly of FIG. 7 seen from the front side of the compound bow.
- FIG. 9 is a side view showing a compound bow according to a second embodiment of the present invention before a bowstring is pulled.
- FIG. 10 is a detailed view of a pulley assembly that is coupled to one of limbs in FIG. 9 .
- FIG. 11 is a side view showing a compound bow according to the second embodiment of the present invention after a bowstring has been pulled.
- FIG. 12 is a detailed view of a pulley assembly in FIG. 11 .
- FIG. 13 is a side view of the pulley assembly of FIG. 12 seen from the rear side of the compound bow.
- FIG. 4 is a side view showing a compound bow according to a first embodiment of the present invention before a bowstring is pulled.
- FIG. 5 is a detailed view of a pulley assembly that is coupled to one of limbs in FIG. 4 .
- FIG. 6 is a side view showing a compound bow according to the first embodiment of the present invention after a bowstring has been pulled.
- FIG. 7 is a detailed view of a pulley assembly that is coupled to one of limbs in FIG. 6 .
- FIG. 8 is a front view of the pulley assembly of FIG. 7 seen from the front side of the compound bow.
- a compound bow includes: a bow main body 100 including a handle 102 at a central portion of which a grip portion is formed and a pair of limbs 103 that are respectively coupled to both ends of the handle 102 ; upper and lower pulley assemblies each including a pulley 110 that is rotatably coupled to a rotating shaft 101 formed on the rear end of each limb 103 , and a cam 200 that is coupled to one side of the pulley 110 and rotating with the pulley 110 ; a bowstring 140 whose either end is wound and coupled to the pulley 110 of each of the upper and lower pulley assemblies; and two cam cables 150 that are wound around the cam 200 of each of the upper and lower pulley assemblies as the bowstring 140 is pulled, in which one end of each of the two cam cables 150 is coupled to one of the upper and lower pulley assemblies, and the other end thereof is coupled to the other of the upper and lower pulley assemblies or the rotating shaft
- At least one of the upper and lower pulley assemblies further includes: a rotating wheel 120 that is rotatably coupled with the rotating shaft 101 of the pulley 110 on the other side surface opposing to one side surface of the pulley 110 to which the cam 200 is coupled, in which one of the two cam cables 150 is coupled to the other side surface of the pulley 110 , wound on the rotating wheel 120 , and extended toward the other of the upper and lower pulley assemblies; and a cam cable guide member 300 one end of which is rotatably coupled to the rotating shaft 120 of the pulley 110 separately from the pulley 110 , at one side of the rotating wheel 120 , in which the cam cable guide member 300 is extended by a predetermined length along one of the cam cables 150 extended toward the other of the upper and lower pulley assemblies from the rotating wheel 120 , and at the other end of which a support member 310 for supporting one of the cam cables 150 is formed in order to make a portion of one of the cam cables 150 extended from the rotating wheel 120 guided in parallel with the pulley 110
- the compound bow according to a first embodiment of the present invention employs a dual cam system the respective components of which will be described below in more detail.
- the bow main body 100 includes a handle 102 at a central portion of which a grip portion is formed so as to be gripped by a user, and a pair of limbs 103 each having two branches.
- a rotating shaft 101 is formed at the rear end of each limb 103 , in which a pulley assembly is rotatably coupled on the rotating shaft 101 between the two branches of each limb 103 .
- a cable guard 105 that pushes the cam cables 150 to one side of the bowstring 140 is coupled at the central portion of the handle 102 , in order to prevent an arrow from being interrupted during shooting.
- each of the upper and lower pulley assemblies is rotatably coupled to the rotating shaft 101 at the rear end of each limb 103 , and includes: a pulley 110 that is rotatably coupled to the rotating shaft 101 formed at the rear end of each limb 103 ; and a cam 200 coupled to one side of the pulley 110 and rotating with the pulley 110 .
- Each pulley 110 is formed of an oval-like plate-shaped member, and has an eccentric through-hole that is formed at the center of the pulley 110 and through which the rotating shaft 101 is coupled. Further, a guide groove that is depressed down to a predetermined depth is formed on the outer circumferential surface of each pulley 110 so that the bowstring 140 may be wound on the outer circumferential surface of each pulley 110 .
- a fixing protrusion 111 for fixing one end of the bowstring 140 wound on the guide groove is formed at one side of each pulley 110 .
- fixing protrusions 112 and 113 are formed in each pulley 110 in which the cam cables 150 are fixed to the fixing protrusions 112 and 113 .
- the cam 200 is coupled to one side of each pulley 110 and is rotated with rotation of the pulley 110 to thus make the cam cables 150 wound on the cam 200 , and includes: a cam cable winding portion 210 fabricated in an arc-shaped form and on which one of the cam cables 150 is wound; and a cam module 220 that has a pivot axis 221 at a position spaced by a predetermined distance from the rotating shaft 101 of the pulley 110 to which the cam 200 is coupled, and that is rotatably coupled to the pivot axis 221 by a predetermined angle from the cam cable winding portion 210 , in which a cam cable winding groove is formed on the outer circumferential surface of the cam module 220 , and the cam cable 150 is wound around the cam cable winding portion 210 and then sequentially wound on the outer circumferential surface of the cam module 220 when the bowstring 140 is pulled.
- the cam cable winding portion 210 is arc-shaped so that the cam cable 150 is wound on the cam cable winding portion 210 , when the bowstring 140 is pulled, in which one end of the cam cable 150 is coupled to the fixing protrusion 112 that is located in the vicinity of the cam cable winding portion 210 .
- a cam cable winding groove is formed on the outer circumferential surface of the cam cable winding portion 210 so that the cam cable 150 is wound on the outer circumferential surface of the cam cable winding portion 210 .
- the cam module 220 has the pivot axis 221 at a position spaced by a predetermined distance from the rotating shaft 101 of the pulley 110 to which the cam 200 is coupled, and is rotatably coupled to the pivot axis 221 by a predetermined angle from the cam cable winding portion 210 , and is configured to have a gentle slope portion 222 formed of a gentle arc-shaped curve and a steep slope portion 223 that is extended from the gentle slope portion 222 to be close to the rotating shaft 101 , to thus form a steep slope. Further, the cam cable winding grooves on which the cam cable 150 is wound are formed on the outer circumferential surfaces of the gentle slope portion 222 and the steep slope portion 223 .
- the cam module 220 is rotated along with the pulley 110 when the bowstring 140 is pulled, and thus the cam cable 150 is sequentially wound on the gentle slope portion 222 and the steep slope portion 223 of the cam module 220 adjacent to the cam cable winding portion 210 .
- the cam module 220 is rotated by a predetermined angle around the pivot axis 221 and is fixed to the pulley 110 by using a bolt at a position where the cam module 220 has been rotated. Rotation of the module cam 220 is to adjust the length of the pull at a let-off state.
- the bowstring 140 is wound in the guide groove of the pulley 110 of each pulley assembly and thus both ends of the bowstring 140 are coupled to the fixing protrusions 111 formed on the respective pulleys 110 .
- the cam cables 150 are formed between a pair of the limbs 103 of the bow main body 100 and are wound on the cams 200 formed in the respective pulleys 110 , as the bowstring 140 is pulled.
- One end of each of the cam cables 150 is coupled to the fixing protrusion 113 formed on the pulley 110 of one of the pulley assemblies, and then is wound around the rotating wheel 120 that is rotatably coupled to the rotating shaft 101 , and the other end of each of the cam cables 150 is extended toward the other of the pulley assemblies to then be fixed to the fixing protrusion 112 of the pulley 110 of the other of the pulley assemblies. Therefore, as the bowstring 140 is pulled, the cam cables 150 are wound on the cam 200 that is coupled to the other pulley 110 of the pulley assemblies.
- the rotating wheel 120 is configured to have a through-hole at the center of the rotating wheel 120 in which the rotating shaft 101 of the pulley 110 is coupled into the through-hole, and to be coupled to the rotating shaft 101 of the pulley 110 at the other side surface of the pulley 110 , that is, at the other side surface opposing one side surface of the pulley 110 to which the cam 200 is coupled, and to be rotatably coupled to the rotating shaft 101 of the pulley 110 separately from the pulley 110 . Further, the cam cable winding groove into which the cam cable is wound is formed on the outer circumferential surface of the circular rotating wheel 120 .
- the cam cable 150 is wound on the rotating wheel 120 and then one end of the cam cable 150 is coupled to the fixing protrusion 113 formed on the pulley 110 in the vicinity of the rotating wheel 120 .
- the cam cable 150 is wound on the cam 200 of the other pulley 110 by the pulling of the bowstring 140 , and accordingly a portion of the cam cable 150 wound on the rotating wheel 120 is released from the rotating wheel 120 .
- the rotating wheel 120 is rotatably coupled to the rotating shaft 101 separately from the pulley 110 , friction between the cam cable 150 and the rotating wheel 120 is reduced to thus reduce the pulling force of the bowstring 140 .
- the cam cable guide member 300 plays a role of making a portion of the cam cable 150 extended from the rotating wheel 120 guided in parallel with the pulley 110 , and is rotatably coupled to the rotating shaft 101 of the pulley 110 at one side surface of the rotating wheel 120 to thus be extended by a predetermined length along the extending direction of the cam cable 150 .
- a through-hole is formed at one end of the cam cable guide member 300 in which the rotating shaft 101 of the pulley 110 is coupled into the through-hole, and a support member 310 for supporting the cam cable 150 is formed at the other end of the cam cable guide member 300 , in which a portion of the cam cable 150 extended from the rotating wheel 120 is guided in parallel with the pulley 110 .
- the support member 310 of the cam cable guide member 300 includes a guide pulley 320 and a support pulley 330 that are respectively rotatably coupled to two shaft members 302 and 303 respectively located at both sides of the cam cable 150 , in which the cam cable 150 is supported between the guide pulley 320 and the support pulley 330 .
- the guide pulley 320 plays a role of guiding the cam cable 150 to be guided in parallel with the pulley 110 , and is rotatably coupled to the shaft member 302 that is protruded toward the pulley 110 at the other end of the cam cable guide member 300 , in which a guide groove 311 for guiding the cam cable 150 is formed on the outer circumferential surface of the guide pulley 320 .
- the guide pulley 320 is formed closer to the rotating shaft 101 than the support pulley 330 .
- the support pulley 330 plays a role of guiding the cam cable 150 to be guided in parallel with the pulley 110 , together with the guide pulley 320 , and simultaneously guiding the cam cable 150 to be guided toward the cable guard 105 via the support pulley 330 .
- the support pulley 330 is formed farther from the rotating shaft 101 at the front of the guide pulley 320 than the guide pulley 320 , and is rotatably coupled to the shaft member 303 that is protruded toward the pulley 110 at the other end of the cam cable guide member 300 .
- the shaft member 303 to which the support pulley 330 is coupled is longer than the shaft member 302 to which the guide pulley 320 is coupled.
- the support pulley 330 is also larger than the guide pulley 320 in width.
- the cam cable 150 is vertically from the rotating wheel 120 to the guide pulley 320 , that is, in parallel with the pulley 110 , and then is bent toward the other side surface of the pulley 110 over the guide pulley 320 in order to be inserted into the cable guard 105 .
- the cam cable 150 is bent toward the cable guard 105 over the guide pulley 320 .
- the support pulley 330 is configured to have an outer circumferential surface that guides the cam cable 150 in contact with the cam cable 150 along the travelling direction of the cam cable 150 in which the outer diameter of the outer circumferential surface becomes smaller inwards (that is, toward the pulley 110 ).
- the cam cables 150 are formed askew from the point of view of the bow, and as shown in FIG. 8 , the cam cable 150 is bent toward the other side surface of the pulley 110 over the guide pulley 320 in order to be inserted into the cable guard 105 .
- the support pulley 330 is configured so that the outer diameter of the outer circumferential surface of the support pulley 330 that contacts the cam cable 150 becomes smaller inwards, the support pulley 330 supports the cam cable 150 from the incoming portion of the cam cable 150 to the outgoing portion of the cam cable 150 in the support pulley 330 , and thus when the bowstring 140 is pulled, the cam cable 150 is guided toward the cable guard 105 more reliably.
- the cam cable guide member 300 is configured to have the above-described structure, the cam cable 150 does not come into contact with the pulley 110 and the cam cable 150 is also guided in parallel with the pulley 110 when the bowstring 140 is pulled. As a result, direction of a force applied to each of the cam cables 150 is parallel to the bowstring 140 , thereby preventing distortion of the bow limbs 103 .
- the guide pulley 320 and the support pulley 330 that guide the cam cable 150 are rotatably coupled to the shaft members 302 and 303 , respectively, the friction of the cam cable 150 in contact with the guide pulley 320 and the support pulley 330 may be minimized to thus reduce a force that is needed to pull the bowstring 140 .
- a support bar member 400 is formed at the other side of the pulley 110 opposing one side of the pulley 110 to which the cam cable guide member 300 is coupled, so as to oppose the cam cable guide member 300 .
- One end of the support bar member 400 is rotatably coupled to the rotating shaft 101 separately from the pulley 110 , and is extended to have the same length as the cam cable guide member 300 .
- Two support protrusions 402 and 403 that are protruded toward the support member 310 to support the guide pulley 320 and the support pulley 330 of the support member 310 are formed at the other end of the support bar member 400 .
- the pulley 110 that is rotated as the bowstring 140 is pulled may be located at the center of the limbs 103 , thereby preventing distortion of the limbs 103 .
- the cam cable 150 is bent toward the cable guard 105 , and thus the guide pulley 320 and the support pulley 330 that guide the cam cable 150 become tense by a force applied inwards as the bowstring 140 is pulled.
- the support protrusions 402 and 403 of the support bar member 400 are configured to support the guide pulley 320 and the support pulley 330 at the other side of the guide pulley 320 and the support pulley 330 , it is possible to promote the structural stability.
- one end of the cam cable 150 is coupled to the fixing protrusion 113 of one pulley 110 , and is wound around the rotating wheel 120 , and the other end of the cam cable 150 is coupled to the fixing protrusion 112 of the other pulley 110 over the guide pulley 320 and the support pulley 330 of the cam cable guide member 300 .
- the pulley 110 is rotated and thus the cam cable 150 wound around the rotating wheel 120 is released from the rotating wheel 120 and then wound on the cam 200 coupled to the opposing pulley 110 .
- the cam cable 150 is wound on the steep slope portion 223 of the cam module 220 coupled to the opposing pulley 110 , the compound bow becomes a let-off state at which an arrow may be shot as shown in FIGS. 6 and 7 .
- the pulley 110 is located between the cam 200 and the rotating wheel 120 in the compound bow according to the first embodiment of the present invention, and thus the pulley 110 is located at the center of the limbs 103 , the conventional Y-shaped buss cables 40 a and 46 a shown in FIG. 1 are not required, and accordingly adjustment of the buss cables 40 a and 46 a for preventing the bow limbs 103 from tilting from side to side is also unnecessary.
- the cam cable 150 is pulled from the cam 200 and the rotating wheel 120 that are located on both sides of the pulley 110 and thus balancing of the limbs 103 is improved, to thereby provide an advantage capable of exerting the strength of the original bow.
- the cam cable 150 is released from the rotating wheel 120 and is traveled to the cam 200 coupled to the pulley 110 of the opposing pulley assembly, as shown in FIG. 8 , the cam cable 150 is guided by the guide pulley 320 and the support pulley 330 of the cam cable guide member 300 coupled to the rotating shaft 101 at one side surface of the rotating wheel 120 , and the cam cable 150 is guided in parallel with the pulley 110 as the bowstring 140 is pulled, without contact with the pulley 110 due to the guide pulley 320 and the support pulley 330 .
- direction of the force being applied to the cam cable 150 is parallel to the bowstring 140 , to thereby enhance the left and right balancing of the limbs, and improve synchronizing where both cams 200 become a let-off state simultaneously, and to thus also provide an effect of improving accuracy of an arrow.
- the example applied to the compound bow of the dual cam system has been described as the embodiment of the present invention, but an example applied to a compound bow of one & a half (1&1 ⁇ 2) cam system may be employed as another embodiment of the present invention.
- a pulley assembly that is coupled between the respective limbs 103 will be described below.
- a lower pulley assembly that is coupled between the respective lower limbs 103 is the same as the pulley assembly of the embodiment shown in FIGS. 4 and 6 . That is, the lower pulley assembly includes: the pulley 110 ; the cam 200 which is coupled to one side of the pulley 110 ; the rotating wheel 120 which is coupled to the other side of the pulley 110 ; and the cam cable guide member 300 .
- the upper pulley assembly includes: the pulley 110 ; and the cam 200 which is coupled to the pulley 110 .
- one end of one of the cam cables 150 is coupled to the rotating shaft of the upper pulley assembly in a buss cable form, and the other end thereof is coupled to one side surface of the lower pulley 110 so as to be wound on the cam 200 of the lower pulley assembly.
- one end of the other of the cam cables 150 is coupled to one side surface of the pulley 110 of the upper pulley assembly so as to be wound on the cam 200 of the upper pulley assembly, and the other end thereof is wound on the rotating wheel 120 of the lower pulley assembly and coupled to the other side surface of the pulley 110 . Both ends of the bowstring 150 are wound on and coupled to the respective pulleys.
- a configuration of the lower pulley assembly is the same as the previous embodiment, and may have the same effect as the lower pulley assembly.
- FIG. 9 is a side view showing a compound bow according to a second embodiment of the present invention before a bowstring is pulled.
- FIG. 10 is a detailed view of a pulley assembly that is coupled to one of limbs in FIG. 9 .
- FIG. 11 is a side view showing a compound bow according to the second embodiment of the present invention after a bowstring has been pulled.
- FIG. 12 is a detailed view of a pulley assembly in FIG. 11 .
- FIG. 13 is a side view of the pulley assembly of FIG. 12 seen from the rear side of the compound bow.
- the cam 200 is coupled to one side of each pulley 110 and is rotated with rotation of the pulley 110 to thus make the cam cables 150 a and 150 b wound on the cam 200 , and includes: a cam cable winding portion 210 fabricated in an arc-shaped form and on which the cam cables 150 a and 150 b are wound; and a cam module 220 that is rotatably coupled to the pulley 110 by a predetermined angle from the cam cable winding portion 210 , around a pivot point “A” at a position spaced by a predetermined distance from the rotating shaft 101 of the pulley 110 to which the cam 200 is coupled, in which a cam cable winding groove is formed on the outer circumferential surface of the cam module 220 , and the cam cables 150 a and 150 b are wound around the cam cable winding portion 210
- the cam 200 further includes a fixing unit that makes the cam module 220 rotated by a predetermined angle around the pivot point “A” in order to control the draw length of the let-off state of the compound bow, and that makes the cam module 220 fixed to the pulley 110 at a position where the cam module 220 has been rotated.
- the fixing unit makes the cam module 220 rotated by a predetermined angle around the pivot point “A,” and makes the cam module 220 fixed to the pulley 110 at a position where the cam module 220 has been rotated.
- an arc-shaped positioning hole 230 centered at the pivot point “A” is formed in the cam module 220
- a coupling hole (not shown) is formed in the pulley 110 to which the cam module 220 is coupled.
- the cam module 220 when a bolt as the coupling member 115 is inserted into the positioning hole 230 and is screw-coupled into the coupling hole (not shown) formed in the pulley 110 , the cam module 220 is coupled to the pulley 110 .
- an arc-shaped coupling hole 116 centered at the pivot point “A” likewise is formed in the pulley 110 as an additional fixing unit, and a bolt 117 is coupled to a bolt hole formed at a predetermined position in the cam module 220 .
- the cam module 220 is additionally secured to the pulley 110 .
- the cam module 220 having such a structure can adjust the draw length of the bowstring 140 .
- the cam module 220 of the upper and lower pulley assemblies 107 and 108 are identically rotated by an identical angle from the cam cable winding portion 210 around the pivot point “A” and the cam module 220 is again secured to the pulley 110 at a position where the cam module 220 has been rotated
- the length of the cam cables 150 a and 150 b that are wound on the gentle slope portion 222 of the cam module 220 increases in comparison with the previous state.
- the length of the cam cables 150 a and 150 b that are wound from the cam cable winding portion 210 to the cam module 220 until the let-off state increases, to thereby increase the draw length of the bowstring 140 .
- the cam cable guide member 300 plays a role of guiding a portion of the cam cables 150 a and 150 b extended from the rotating wheel 120 in parallel with the pulley 110 , and is rotatably coupled to the rotating shaft 101 of the pulley 110 separately from the pulley 110 at one side surface of the rotating wheel 120 , so as to be extended by a predetermined length in an arc-shaped form along the direction of extension of the cam cables 150 a and 150 b .
- two coupling units 301 are protrudingly formed at one end of the cam cable guide member 300 in order to couple the rotating shaft 101 to the cam cable guide member 300 , and through-holes through which the rotating shaft 101 of the pulley 110 is coupled are formed in the coupling units 301 , respectively.
- the two coupling units 301 are coupled to the rotating shaft 101 at both sides of one branch adjacent to the rotating wheel 120 of the two branches forming the rear portion of each limb 103 .
- the support member 310 that supports the cam cables 150 a and 150 b is formed at the other end of the cam cable guide member 300 , in order to make a portion of the cam cables 150 a and 150 b that are wound on the rotating wheel 120 and then extended therefrom guided in parallel with the pulley 110 .
- cam cable guide member 300 is made in an arch-shaped form. Since the cam cables 150 a and 150 b are bent to the other side surface of the pulley 110 in order to be inserted into the cable guard 105 past the guide pulley 320 , and thus the other end of the cam guide cable guide member 300 in which the support member 310 is formed, is subjected to receive a force in the opposite side of the pulley 110 , the cam cable guide member 300 is made in an arch-shaped form to make the length of the cam cable guide member 300 be long while making the distance from the rotating shaft 101 to the support member 310 be short, to thereby improve a counteraction force against the force applied to the pulley 110 and prevent a deformity such as bending of the cam cable guide member 300 .
- the support member 310 of the cam cable guide member 300 includes a guide pulley 320 and a support pulley 330 that are respectively rotatably coupled to two shaft members 302 and 303 respectively located at both sides of the cam cables 150 a and 150 b , in which the cam cables 150 a and 150 b are supported between the guide pulley 320 and the support pulley 330 .
- the guide pulley 320 plays a role of guiding the cam cables 150 a and 150 b to be guided in parallel with the pulley 110 , and is rotatably coupled to the shaft member 302 that is protruded toward the pulley 110 at the other end of the cam cable guide member 300 , in which a guide groove 311 for guiding the cam cables 150 a and 150 b is formed on the outer circumferential surface of the guide pulley 320 .
- the guide pulley 320 is formed closer to the rotating shaft 101 than the support pulley 330 .
- the support pulley 330 plays a role of guiding the cam cables 150 a and 150 b to be guided in parallel with the pulley 110 , together with the guide pulley 320 , and simultaneously guiding the cam cables 150 a and 150 b to be guided toward the cable guard 105 via the support pulley 330 .
- the support pulley 330 is formed farther from the rotating shaft 101 at the front of the guide pulley 320 than the guide pulley 320 , and is rotatably coupled to the shaft member 303 that is protruded toward the pulley 110 at the other end of the cam cable guide member 300 .
- the cam cable guide member 300 is configured to have the above-described structure, the cam cables 150 a and 150 b do not come into contact with the pulley 110 and the cam cables 150 a and 150 b are also guided in parallel with the pulley 110 when the bowstring 140 is pulled. As a result, direction of a force applied to each of the cam cables 150 a and 150 b is parallel to the bowstring 140 , thereby preventing distortion of the bow limbs 103 .
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- General Engineering & Computer Science (AREA)
- Gears, Cams (AREA)
Abstract
A compound bow includes a bow main body including a handle and a pair of limbs. Upper and lower pulleys are coupled to the rear end of each limb. A bowstring is provided and a cam that is coupled to each pulley. A rotating wheel is coupled with the rotating shaft of the pulley. Cam cables are wound around the cams, in which one end of each cam cable is coupled to one pulley and the other end thereof is coupled to the other pulley. A cam cable guide member has one end rotatably coupled to the rotating shaft of the pulley, and at the other end of which a support member for supporting the cam cable is formed in order to make a portion of the cam cable extended from the rotating wheel guided in parallel with the pulley.
Description
- This application claims the benefit of Korean Patent Application No. 10-2013-0100228, filed on Aug. 23, 2013 and No. 10-2013-0164958, filed on Dec. 27, 2013 in the Korean Intellectual Property Office, the disclosures of which are incorporated in their entireties herein by reference and to which priority is claimed.
- 1. Field of the Invention
- The present invention relates to a compound bow, and more particularly, to a compound bow which can prevent distortion of the bow and improve accuracy of an arrow when a bowstring is pulled.
- 2. Description of the Related Art
- Typically, compound bows are configured so that a bowstring may be easily pulled without using a large force and arrow shooting power is increased during shooting, by using an effect of a cam or wheel, to thus result in a fast speed of an arrow and have very strong power, and are widely used mainly for hunting.
- As shown in
FIGS. 1 to 3 , a conventional compound bow is configured to haveupper limbs 20 that are coupled to the upper portion of ahandle 10 at the center of which a grip portion is formed, andlower limbs 26 coupled to the lower portion of thehandle 10. A cut-outportion 21 is formed between theupper limbs 20 whoseedges 22 are spaced apart from each other, and a cut-outportion 27 is formed between thelower limbs 26 whoseedges 28 are spaced apart from each other. Rotatingshafts 70 are horizontally formed through theedges 22 of theupper limbs 20 and the cut-outportion 21, and through theedges 28 of thelower limbs 26 and the cut-outportion 27, respectively. Upper andlower pulleys shafts 70. - A
bowstring 50 is wound along aguide groove pulley bowstring 50 are combined with eachpulley cam pulley pulley bowstring 50 is pulled,cam cables cams cam cable pulley cam cam cable shaft 70 at both sides of the cut-outportion opposing limbs shaped buss cables - Further, a
cable guard 60 is laterally mounted at one side of a center portion of ahandle 10, in which thecable guard 60 pushes thecam cables bowstring 50 so that an arrow is not prevented from being shot during shooting. In addition, aslide 66 is movably mounted on thecable guard 60 in which thecam cables slide 66. - When the
bowstring 50 is pulled in the prior art compound bow that is configured as described above, the lower andupper pulleys cams upper pulleys cam cables bowstring 50 is released in a let-off state, an arrow obtains a strong driving force by a strong elastic force of the bow which returns to an original position instantaneously. - However, in order to prevent the
cam cables bowstring 50 from interfering with the shooting of an arrow in the compound bow, thecam cables cable guard 60 and thecams respective pulleys pulleys bowstring 50 is wound are not located at the center of each of thelimbs FIG. 2 . Accordingly, when thebowstring 50 is pulled, thebow limbs pulleys FIG. 3 . As a result, the inherent strength of the bow is not exhibited and the accuracy of the arrows is also dropped. Thus, although thebuss cables buss cables bow limbs buss cables bowstring 50 is pulled. - To solve the above conventional problems or defects, it is an object of the present invention to provide a compound bow to prevent twisting of the bow, to exhibit inherent strength of the bow, and to improve accuracy of an arrow.
- To accomplish the above and other objects of the present invention, according to an aspect of the present invention, there is provided a compound bow comprising: a bow main body including a handle at a central portion of which a grip portion is formed and a pair of limbs that are respectively coupled to both ends of the handle; upper and lower pulley assemblies each including a pulley that is rotatably coupled to a rotating shaft formed on the rear end of each limb, and a cam that is coupled to one side of the pulley and rotating with the pulley; a bowstring whose either end is wound and coupled to the pulley of each of the upper and lower pulley assemblies; and two cam cables that are wound around the cam of each of the upper and lower pulley assemblies as the bowstring is pulled, in which one end of each of the two cam cables is coupled to one of the upper and lower pulley assemblies, and the other end thereof is coupled to the other of the upper and lower pulley assemblies or the rotating shaft of the other of the upper and lower pulley assemblies; wherein at least one of the upper and lower pulley assemblies further comprises: a rotating wheel that is coupled with the rotating shaft of the pulley on the other side surface opposing to one side surface of the pulley to which the cam is coupled, in which one of the two cam cables is coupled to the other side surface of the pulley, wound on the rotating wheel, and extended toward the other of the upper and lower pulley assemblies; and a cam cable guide member one end of which is rotatably coupled to the rotating shaft of the pulley separately from the pulley, at one side of the rotating wheel, in which the cam cable guide member is extended by a predetermined length along one of the cam cables extended toward the other of the upper and lower pulley assemblies from the rotating wheel, and at the other end of which a support member for supporting one of the cam cables is formed in order to make a portion of one of the cam cables extended from the rotating wheel guided in parallel with the pulley.
- Preferably but not necessarily, the rotating wheel is rotatably coupled to the rotating shaft separately from the pulley.
- Preferably but not necessarily, the support member of the cam cable guide member comprises a guide pulley and a support pulley that are respectively rotatably coupled to two shaft members respectively located at both sides of the cam cable, in which the cam cable is supported between the guide pulley and the support pulley.
- Preferably but not necessarily, a guide groove for guiding the cam cable is formed on an outer circumferential surface of the guide pulley.
- Preferably but not necessarily, the support pulley is formed at the front of the guide pulley, and is located at a longer distance from the rotating shaft of the cam cable guide member than the guide pulley.
- Preferably but not necessarily, the support pulley is formed to have an outer diameter of an outer circumferential surface of the support pulley that guides the cam cable in contact with the cam cable becomes smaller inwards, and thereby guide the cam cable to a cable guard that is coupled to the handle of the bow main body and pushes the cam cable in one direction.
- Preferably but not necessarily, the compound bow further comprises a support bar one end of which is rotatably coupled to the rotating shaft separately from the pulley at the other side surface of the pulley to which the cam cable guide member is coupled, so as to oppose the cam cable guide member, and at the other end of which two support protrusions are formed for supporting each of the guide pulley and the pulley support of the cam cable guide member.
- Preferably but not necessarily, two coupling portions to which the rotating shaft is coupled are formed at one end of the cam cable guide member, in which the two coupling portions are coupled to the rotating shaft at both sides of one of two branches adjacent to the rotating wheel of the two branches that form a rear portion of the limbs, and the cam cable guide member is made in an arch-shaped form.
- As described above, the present invention provides a compound bow to prevent twisting of the bow during use, to exhibit inherent strength of the bow, and to improve synchronizing to thus improve accuracy of an arrow.
-
FIG. 1 is a perspective view of a conventional compound bow. -
FIG. 2 is a rear view of the compound bow ofFIG. 1 . -
FIG. 3 is a perspective view showing a twisted state of a pulley assembly coupled to a limb ofFIG. 1 . -
FIG. 4 is a side view showing a compound bow according to a first embodiment of the present invention before a bowstring is pulled. -
FIG. 5 is a detailed view of a pulley assembly that is coupled to one of limbs inFIG. 4 . -
FIG. 6 is a side view showing a compound bow according to the first embodiment of the present invention after a bowstring has been pulled. -
FIG. 7 is a detailed view of a pulley assembly that is coupled to one of limbs inFIG. 6 . -
FIG. 8 is a side view of the pulley assembly ofFIG. 7 seen from the front side of the compound bow. -
FIG. 9 is a side view showing a compound bow according to a second embodiment of the present invention before a bowstring is pulled. -
FIG. 10 is a detailed view of a pulley assembly that is coupled to one of limbs inFIG. 9 . -
FIG. 11 is a side view showing a compound bow according to the second embodiment of the present invention after a bowstring has been pulled. -
FIG. 12 is a detailed view of a pulley assembly inFIG. 11 . -
FIG. 13 is a side view of the pulley assembly ofFIG. 12 seen from the rear side of the compound bow. - The above and/or other objects and/or advantages of the present invention will become more apparent by the following description of embodiments of the present invention.
- Hereinbelow, a compound bow according to a first embodiment of the present invention will be described in more detail with reference to the accompanying drawings.
-
FIG. 4 is a side view showing a compound bow according to a first embodiment of the present invention before a bowstring is pulled.FIG. 5 is a detailed view of a pulley assembly that is coupled to one of limbs inFIG. 4 .FIG. 6 is a side view showing a compound bow according to the first embodiment of the present invention after a bowstring has been pulled.FIG. 7 is a detailed view of a pulley assembly that is coupled to one of limbs inFIG. 6 .FIG. 8 is a front view of the pulley assembly ofFIG. 7 seen from the front side of the compound bow. - Referring to
FIGS. 4 to 8 , a compound bow according to a first embodiment of the present invention includes: a bowmain body 100 including ahandle 102 at a central portion of which a grip portion is formed and a pair oflimbs 103 that are respectively coupled to both ends of thehandle 102; upper and lower pulley assemblies each including apulley 110 that is rotatably coupled to arotating shaft 101 formed on the rear end of eachlimb 103, and acam 200 that is coupled to one side of thepulley 110 and rotating with thepulley 110; abowstring 140 whose either end is wound and coupled to thepulley 110 of each of the upper and lower pulley assemblies; and twocam cables 150 that are wound around thecam 200 of each of the upper and lower pulley assemblies as thebowstring 140 is pulled, in which one end of each of the twocam cables 150 is coupled to one of the upper and lower pulley assemblies, and the other end thereof is coupled to the other of the upper and lower pulley assemblies or therotating shaft 100 of the other of the upper and lower pulley assemblies. - At least one of the upper and lower pulley assemblies further includes: a
rotating wheel 120 that is rotatably coupled with therotating shaft 101 of thepulley 110 on the other side surface opposing to one side surface of thepulley 110 to which thecam 200 is coupled, in which one of the twocam cables 150 is coupled to the other side surface of thepulley 110, wound on therotating wheel 120, and extended toward the other of the upper and lower pulley assemblies; and a camcable guide member 300 one end of which is rotatably coupled to therotating shaft 120 of thepulley 110 separately from thepulley 110, at one side of therotating wheel 120, in which the camcable guide member 300 is extended by a predetermined length along one of thecam cables 150 extended toward the other of the upper and lower pulley assemblies from therotating wheel 120, and at the other end of which asupport member 310 for supporting one of thecam cables 150 is formed in order to make a portion of one of thecam cables 150 extended from therotating wheel 120 guided in parallel with thepulley 110. - As shown in
FIGS. 4 to 8 , the compound bow according to a first embodiment of the present invention employs a dual cam system the respective components of which will be described below in more detail. First, the bowmain body 100 includes ahandle 102 at a central portion of which a grip portion is formed so as to be gripped by a user, and a pair oflimbs 103 each having two branches. Arotating shaft 101 is formed at the rear end of eachlimb 103, in which a pulley assembly is rotatably coupled on therotating shaft 101 between the two branches of eachlimb 103. Acable guard 105 that pushes thecam cables 150 to one side of thebowstring 140 is coupled at the central portion of thehandle 102, in order to prevent an arrow from being interrupted during shooting. - Then, each of the upper and lower pulley assemblies is rotatably coupled to the
rotating shaft 101 at the rear end of eachlimb 103, and includes: apulley 110 that is rotatably coupled to therotating shaft 101 formed at the rear end of eachlimb 103; and acam 200 coupled to one side of thepulley 110 and rotating with thepulley 110. - Each
pulley 110 is formed of an oval-like plate-shaped member, and has an eccentric through-hole that is formed at the center of thepulley 110 and through which therotating shaft 101 is coupled. Further, a guide groove that is depressed down to a predetermined depth is formed on the outer circumferential surface of eachpulley 110 so that thebowstring 140 may be wound on the outer circumferential surface of eachpulley 110. A fixingprotrusion 111 for fixing one end of thebowstring 140 wound on the guide groove is formed at one side of eachpulley 110. In addition, fixingprotrusions pulley 110 in which thecam cables 150 are fixed to the fixingprotrusions - The
cam 200 is coupled to one side of eachpulley 110 and is rotated with rotation of thepulley 110 to thus make thecam cables 150 wound on thecam 200, and includes: a camcable winding portion 210 fabricated in an arc-shaped form and on which one of thecam cables 150 is wound; and acam module 220 that has apivot axis 221 at a position spaced by a predetermined distance from therotating shaft 101 of thepulley 110 to which thecam 200 is coupled, and that is rotatably coupled to thepivot axis 221 by a predetermined angle from the camcable winding portion 210, in which a cam cable winding groove is formed on the outer circumferential surface of thecam module 220, and thecam cable 150 is wound around the camcable winding portion 210 and then sequentially wound on the outer circumferential surface of thecam module 220 when thebowstring 140 is pulled. - The cam
cable winding portion 210 is arc-shaped so that thecam cable 150 is wound on the camcable winding portion 210, when thebowstring 140 is pulled, in which one end of thecam cable 150 is coupled to the fixingprotrusion 112 that is located in the vicinity of the camcable winding portion 210. In addition, a cam cable winding groove is formed on the outer circumferential surface of the camcable winding portion 210 so that thecam cable 150 is wound on the outer circumferential surface of the camcable winding portion 210. - The
cam module 220 has thepivot axis 221 at a position spaced by a predetermined distance from therotating shaft 101 of thepulley 110 to which thecam 200 is coupled, and is rotatably coupled to thepivot axis 221 by a predetermined angle from the camcable winding portion 210, and is configured to have agentle slope portion 222 formed of a gentle arc-shaped curve and asteep slope portion 223 that is extended from thegentle slope portion 222 to be close to therotating shaft 101, to thus form a steep slope. Further, the cam cable winding grooves on which thecam cable 150 is wound are formed on the outer circumferential surfaces of thegentle slope portion 222 and thesteep slope portion 223. Accordingly, thecam module 220 is rotated along with thepulley 110 when thebowstring 140 is pulled, and thus thecam cable 150 is sequentially wound on thegentle slope portion 222 and thesteep slope portion 223 of thecam module 220 adjacent to the camcable winding portion 210. Thus, thecam module 220 is rotated by a predetermined angle around thepivot axis 221 and is fixed to thepulley 110 by using a bolt at a position where thecam module 220 has been rotated. Rotation of themodule cam 220 is to adjust the length of the pull at a let-off state. - The
bowstring 140 is wound in the guide groove of thepulley 110 of each pulley assembly and thus both ends of thebowstring 140 are coupled to the fixingprotrusions 111 formed on therespective pulleys 110. - The
cam cables 150 are formed between a pair of thelimbs 103 of the bowmain body 100 and are wound on thecams 200 formed in therespective pulleys 110, as thebowstring 140 is pulled. One end of each of thecam cables 150 is coupled to the fixingprotrusion 113 formed on thepulley 110 of one of the pulley assemblies, and then is wound around therotating wheel 120 that is rotatably coupled to therotating shaft 101, and the other end of each of thecam cables 150 is extended toward the other of the pulley assemblies to then be fixed to the fixingprotrusion 112 of thepulley 110 of the other of the pulley assemblies. Therefore, as thebowstring 140 is pulled, thecam cables 150 are wound on thecam 200 that is coupled to theother pulley 110 of the pulley assemblies. - The
rotating wheel 120 is configured to have a through-hole at the center of therotating wheel 120 in which therotating shaft 101 of thepulley 110 is coupled into the through-hole, and to be coupled to therotating shaft 101 of thepulley 110 at the other side surface of thepulley 110, that is, at the other side surface opposing one side surface of thepulley 110 to which thecam 200 is coupled, and to be rotatably coupled to therotating shaft 101 of thepulley 110 separately from thepulley 110. Further, the cam cable winding groove into which the cam cable is wound is formed on the outer circumferential surface of the circularrotating wheel 120. Thus, thecam cable 150 is wound on therotating wheel 120 and then one end of thecam cable 150 is coupled to the fixingprotrusion 113 formed on thepulley 110 in the vicinity of therotating wheel 120. Thecam cable 150 is wound on thecam 200 of theother pulley 110 by the pulling of thebowstring 140, and accordingly a portion of thecam cable 150 wound on therotating wheel 120 is released from therotating wheel 120. Here, since therotating wheel 120 is rotatably coupled to therotating shaft 101 separately from thepulley 110, friction between thecam cable 150 and therotating wheel 120 is reduced to thus reduce the pulling force of thebowstring 140. - The cam
cable guide member 300 plays a role of making a portion of thecam cable 150 extended from therotating wheel 120 guided in parallel with thepulley 110, and is rotatably coupled to therotating shaft 101 of thepulley 110 at one side surface of therotating wheel 120 to thus be extended by a predetermined length along the extending direction of thecam cable 150. To this end, a through-hole is formed at one end of the camcable guide member 300 in which therotating shaft 101 of thepulley 110 is coupled into the through-hole, and asupport member 310 for supporting thecam cable 150 is formed at the other end of the camcable guide member 300, in which a portion of thecam cable 150 extended from therotating wheel 120 is guided in parallel with thepulley 110. - The
support member 310 of the camcable guide member 300 includes aguide pulley 320 and asupport pulley 330 that are respectively rotatably coupled to twoshaft members cam cable 150, in which thecam cable 150 is supported between theguide pulley 320 and thesupport pulley 330. Theguide pulley 320 plays a role of guiding thecam cable 150 to be guided in parallel with thepulley 110, and is rotatably coupled to theshaft member 302 that is protruded toward thepulley 110 at the other end of the camcable guide member 300, in which aguide groove 311 for guiding thecam cable 150 is formed on the outer circumferential surface of theguide pulley 320. Theguide pulley 320 is formed closer to therotating shaft 101 than thesupport pulley 330. - The
support pulley 330 plays a role of guiding thecam cable 150 to be guided in parallel with thepulley 110, together with theguide pulley 320, and simultaneously guiding thecam cable 150 to be guided toward thecable guard 105 via thesupport pulley 330. Thesupport pulley 330 is formed farther from therotating shaft 101 at the front of theguide pulley 320 than theguide pulley 320, and is rotatably coupled to theshaft member 303 that is protruded toward thepulley 110 at the other end of the camcable guide member 300. Theshaft member 303 to which thesupport pulley 330 is coupled is longer than theshaft member 302 to which theguide pulley 320 is coupled. Thus, thesupport pulley 330 is also larger than theguide pulley 320 in width. As shown inFIG. 8 , thecam cable 150 is vertically from therotating wheel 120 to theguide pulley 320, that is, in parallel with thepulley 110, and then is bent toward the other side surface of thepulley 110 over theguide pulley 320 in order to be inserted into thecable guard 105. As described above, thecam cable 150 is bent toward thecable guard 105 over theguide pulley 320. - Further, as shown in
FIG. 8 , thesupport pulley 330 is configured to have an outer circumferential surface that guides thecam cable 150 in contact with thecam cable 150 along the travelling direction of thecam cable 150 in which the outer diameter of the outer circumferential surface becomes smaller inwards (that is, toward the pulley 110). As shown inFIGS. 4 and 5 , thecam cables 150 are formed askew from the point of view of the bow, and as shown inFIG. 8 , thecam cable 150 is bent toward the other side surface of thepulley 110 over theguide pulley 320 in order to be inserted into thecable guard 105. As described above, since thesupport pulley 330 is configured so that the outer diameter of the outer circumferential surface of thesupport pulley 330 that contacts thecam cable 150 becomes smaller inwards, thesupport pulley 330 supports thecam cable 150 from the incoming portion of thecam cable 150 to the outgoing portion of thecam cable 150 in thesupport pulley 330, and thus when thebowstring 140 is pulled, thecam cable 150 is guided toward thecable guard 105 more reliably. - Since the cam
cable guide member 300 is configured to have the above-described structure, thecam cable 150 does not come into contact with thepulley 110 and thecam cable 150 is also guided in parallel with thepulley 110 when thebowstring 140 is pulled. As a result, direction of a force applied to each of thecam cables 150 is parallel to thebowstring 140, thereby preventing distortion of thebow limbs 103. - Further, since the
guide pulley 320 and thesupport pulley 330 that guide thecam cable 150 are rotatably coupled to theshaft members cam cable 150 in contact with theguide pulley 320 and thesupport pulley 330 may be minimized to thus reduce a force that is needed to pull thebowstring 140. - Further, as shown in
FIG. 8 , asupport bar member 400 is formed at the other side of thepulley 110 opposing one side of thepulley 110 to which the camcable guide member 300 is coupled, so as to oppose the camcable guide member 300. One end of thesupport bar member 400 is rotatably coupled to therotating shaft 101 separately from thepulley 110, and is extended to have the same length as the camcable guide member 300. Twosupport protrusions support member 310 to support theguide pulley 320 and thesupport pulley 330 of thesupport member 310 are formed at the other end of thesupport bar member 400. - Thus, since the
support bar member 400 opposite to the camcable guide member 300 is coupled to therotating shaft 101 at the other side of thepulley 110 to which the camcable guide member 300 is coupled, thepulley 110 that is rotated as thebowstring 140 is pulled may be located at the center of thelimbs 103, thereby preventing distortion of thelimbs 103. Further, as shown inFIG. 8 , thecam cable 150 is bent toward thecable guard 105, and thus theguide pulley 320 and thesupport pulley 330 that guide thecam cable 150 become tense by a force applied inwards as thebowstring 140 is pulled. Accordingly, since thesupport protrusions support bar member 400 are configured to support theguide pulley 320 and thesupport pulley 330 at the other side of theguide pulley 320 and thesupport pulley 330, it is possible to promote the structural stability. - The operation of the compound bow according to the first embodiment of this invention will be described below.
- As shown in
FIGS. 4 and 5 , before thebowstring 140 is pulled, one end of thecam cable 150 is coupled to the fixingprotrusion 113 of onepulley 110, and is wound around therotating wheel 120, and the other end of thecam cable 150 is coupled to the fixingprotrusion 112 of theother pulley 110 over theguide pulley 320 and thesupport pulley 330 of the camcable guide member 300. When thebowstring 140 is then pulled, thepulley 110 is rotated and thus thecam cable 150 wound around therotating wheel 120 is released from therotating wheel 120 and then wound on thecam 200 coupled to the opposingpulley 110. In addition, when thecam cable 150 is wound on thesteep slope portion 223 of thecam module 220 coupled to the opposingpulley 110, the compound bow becomes a let-off state at which an arrow may be shot as shown inFIGS. 6 and 7 . - Since the
pulley 110 is located between thecam 200 and therotating wheel 120 in the compound bow according to the first embodiment of the present invention, and thus thepulley 110 is located at the center of thelimbs 103, the conventional Y-shapedbuss cables FIG. 1 are not required, and accordingly adjustment of thebuss cables bow limbs 103 from tilting from side to side is also unnecessary. In addition, thecam cable 150 is pulled from thecam 200 and therotating wheel 120 that are located on both sides of thepulley 110 and thus balancing of thelimbs 103 is improved, to thereby provide an advantage capable of exerting the strength of the original bow. - Further, when the
cam cable 150 is released from therotating wheel 120 and is traveled to thecam 200 coupled to thepulley 110 of the opposing pulley assembly, as shown inFIG. 8 , thecam cable 150 is guided by theguide pulley 320 and thesupport pulley 330 of the camcable guide member 300 coupled to therotating shaft 101 at one side surface of therotating wheel 120, and thecam cable 150 is guided in parallel with thepulley 110 as thebowstring 140 is pulled, without contact with thepulley 110 due to theguide pulley 320 and thesupport pulley 330. As a result, direction of the force being applied to thecam cable 150 is parallel to thebowstring 140, to thereby enhance the left and right balancing of the limbs, and improve synchronizing where bothcams 200 become a let-off state simultaneously, and to thus also provide an effect of improving accuracy of an arrow. - Further, a portion of the
cam cable 150 wound on therotating wheel 120 by pulling of thebowstring 140 is released from therotating wheel 120. Here, since therotating wheel 120 is rotatably coupled to therotating shaft 101 separately from thepulley 110, friction between thecam cable 150 and therotating wheel 120 is reduced to thus reduce the force needed to pull thebowstring 140. - Meanwhile, the example applied to the compound bow of the dual cam system has been described as the embodiment of the present invention, but an example applied to a compound bow of one & a half (1&½) cam system may be employed as another embodiment of the present invention. Although not shown, in the case that the present invention is applied to a compound bow of 1&½ cam system, a pulley assembly that is coupled between the
respective limbs 103 will be described below. A lower pulley assembly that is coupled between the respectivelower limbs 103 is the same as the pulley assembly of the embodiment shown inFIGS. 4 and 6 . That is, the lower pulley assembly includes: thepulley 110; thecam 200 which is coupled to one side of thepulley 110; therotating wheel 120 which is coupled to the other side of thepulley 110; and the camcable guide member 300. - However, the upper pulley assembly includes: the
pulley 110; and thecam 200 which is coupled to thepulley 110. Accordingly, one end of one of thecam cables 150 is coupled to the rotating shaft of the upper pulley assembly in a buss cable form, and the other end thereof is coupled to one side surface of thelower pulley 110 so as to be wound on thecam 200 of the lower pulley assembly. In addition, one end of the other of thecam cables 150 is coupled to one side surface of thepulley 110 of the upper pulley assembly so as to be wound on thecam 200 of the upper pulley assembly, and the other end thereof is wound on therotating wheel 120 of the lower pulley assembly and coupled to the other side surface of thepulley 110. Both ends of thebowstring 150 are wound on and coupled to the respective pulleys. - As described above, even in the case that the present invention is applied to the compound bow of the 1&½ cam system, a configuration of the lower pulley assembly is the same as the previous embodiment, and may have the same effect as the lower pulley assembly.
- Next, a compound bow according to a second embodiment of the present invention will be described with reference to the drawings.
FIG. 9 is a side view showing a compound bow according to a second embodiment of the present invention before a bowstring is pulled. -
FIG. 10 is a detailed view of a pulley assembly that is coupled to one of limbs inFIG. 9 .FIG. 11 is a side view showing a compound bow according to the second embodiment of the present invention after a bowstring has been pulled.FIG. 12 is a detailed view of a pulley assembly inFIG. 11 .FIG. 13 is a side view of the pulley assembly ofFIG. 12 seen from the rear side of the compound bow. - The description of the compound bow according to the second embodiment of the present invention focuses on a different configuration from the description of the first embodiment of the present invention. In the compound bow according to the second embodiment of the present invention, the
cam 200 is coupled to one side of eachpulley 110 and is rotated with rotation of thepulley 110 to thus make thecam cables cam 200, and includes: a camcable winding portion 210 fabricated in an arc-shaped form and on which thecam cables cam module 220 that is rotatably coupled to thepulley 110 by a predetermined angle from the camcable winding portion 210, around a pivot point “A” at a position spaced by a predetermined distance from therotating shaft 101 of thepulley 110 to which thecam 200 is coupled, in which a cam cable winding groove is formed on the outer circumferential surface of thecam module 220, and thecam cables cable winding portion 210 and then sequentially wound on the outer circumferential surface of thecam module 220 when thebowstring 140 is pulled. - In addition, the
cam 200 further includes a fixing unit that makes thecam module 220 rotated by a predetermined angle around the pivot point “A” in order to control the draw length of the let-off state of the compound bow, and that makes thecam module 220 fixed to thepulley 110 at a position where thecam module 220 has been rotated. - The fixing unit makes the
cam module 220 rotated by a predetermined angle around the pivot point “A,” and makes thecam module 220 fixed to thepulley 110 at a position where thecam module 220 has been rotated. To this end, an arc-shapedpositioning hole 230 centered at the pivot point “A” is formed in thecam module 220, and a coupling hole (not shown) is formed in thepulley 110 to which thecam module 220 is coupled. Thus, when thecam module 220 is rotated by a predetermined angle around the pivot point “A,” and acoupling member 115 is coupled to the coupling hole (not shown) formed in thepulley 110 at a predetermined position of thepositioning hole 230, thecam module 220 is coupled to thepulley 110. In the present invention, when a bolt as thecoupling member 115 is inserted into thepositioning hole 230 and is screw-coupled into the coupling hole (not shown) formed in thepulley 110, thecam module 220 is coupled to thepulley 110. In addition, an arc-shapedcoupling hole 116 centered at the pivot point “A” likewise is formed in thepulley 110 as an additional fixing unit, and abolt 117 is coupled to a bolt hole formed at a predetermined position in thecam module 220. When thebolt 117 passes through the arc-shapedcoupling hole 116 formed in thepulley 110 and a nut is coupled to one end of thebolt 117, thecam module 220 is additionally secured to thepulley 110. - The
cam module 220 having such a structure can adjust the draw length of thebowstring 140. Thus, when thecam module 220 of the upper andlower pulley assemblies cable winding portion 210 around the pivot point “A” and thecam module 220 is again secured to thepulley 110 at a position where thecam module 220 has been rotated, the length of thecam cables gentle slope portion 222 of thecam module 220 increases in comparison with the previous state. At last, the length of thecam cables cable winding portion 210 to thecam module 220 until the let-off state increases, to thereby increase the draw length of thebowstring 140. - As shown in
FIGS. 9 to 13 , the camcable guide member 300 according to the second embodiment plays a role of guiding a portion of thecam cables rotating wheel 120 in parallel with thepulley 110, and is rotatably coupled to therotating shaft 101 of thepulley 110 separately from thepulley 110 at one side surface of therotating wheel 120, so as to be extended by a predetermined length in an arc-shaped form along the direction of extension of thecam cables FIG. 13 , twocoupling units 301 are protrudingly formed at one end of the camcable guide member 300 in order to couple therotating shaft 101 to the camcable guide member 300, and through-holes through which therotating shaft 101 of thepulley 110 is coupled are formed in thecoupling units 301, respectively. Thus, the twocoupling units 301 are coupled to therotating shaft 101 at both sides of one branch adjacent to therotating wheel 120 of the two branches forming the rear portion of eachlimb 103. In addition, thesupport member 310 that supports thecam cables cable guide member 300, in order to make a portion of thecam cables rotating wheel 120 and then extended therefrom guided in parallel with thepulley 110. The reason why the camcable guide member 300 is made in an arch-shaped form is that since thecam cables pulley 110 in order to be inserted into thecable guard 105 past theguide pulley 320, and thus the other end of the cam guidecable guide member 300 in which thesupport member 310 is formed, is subjected to receive a force in the opposite side of thepulley 110, the camcable guide member 300 is made in an arch-shaped form to make the length of the camcable guide member 300 be long while making the distance from therotating shaft 101 to thesupport member 310 be short, to thereby improve a counteraction force against the force applied to thepulley 110 and prevent a deformity such as bending of the camcable guide member 300. - The
support member 310 of the camcable guide member 300 includes aguide pulley 320 and asupport pulley 330 that are respectively rotatably coupled to twoshaft members cam cables cam cables guide pulley 320 and thesupport pulley 330. Theguide pulley 320 plays a role of guiding thecam cables pulley 110, and is rotatably coupled to theshaft member 302 that is protruded toward thepulley 110 at the other end of the camcable guide member 300, in which aguide groove 311 for guiding thecam cables guide pulley 320. Theguide pulley 320 is formed closer to therotating shaft 101 than thesupport pulley 330. - The
support pulley 330 plays a role of guiding thecam cables pulley 110, together with theguide pulley 320, and simultaneously guiding thecam cables cable guard 105 via thesupport pulley 330. Thesupport pulley 330 is formed farther from therotating shaft 101 at the front of theguide pulley 320 than theguide pulley 320, and is rotatably coupled to theshaft member 303 that is protruded toward thepulley 110 at the other end of the camcable guide member 300. - Since the cam
cable guide member 300 is configured to have the above-described structure, thecam cables pulley 110 and thecam cables pulley 110 when thebowstring 140 is pulled. As a result, direction of a force applied to each of thecam cables bowstring 140, thereby preventing distortion of thebow limbs 103. - Here, a detailed description thereof will be omitted for other configurations and operational effects of the second embodiment similar to those of the first embodiment.
- As described above, the present invention has been described with respect to particularly preferred embodiments. However, the present invention is not limited to the above embodiments, and it is possible for one who has an ordinary skill in the art to make various modifications and variations, without departing off the spirit of the present invention. Thus, the protective scope of the present invention is not defined within the detailed description thereof but is defined by the claims to be described later and the technical spirit of the present invention.
Claims (10)
1. A compound bow comprising:
a bow main body including a handle at a central portion of which a grip portion is formed and a pair of limbs that are respectively coupled to both ends of the handle;
upper and lower pulley assemblies each including a pulley that is rotatably coupled to a rotating shaft formed on the rear end of each limb, and a cam that is coupled to one side of the pulley and rotating with the pulley;
a bowstring whose either end is wound and coupled to the pulley of each of the upper and lower pulley assemblies; and
two cam cables that are wound around the cam of each of the upper and lower pulley assemblies as the bowstring is pulled, in which one end of each of the two cam cables is coupled to one of the upper and lower pulley assemblies, and the other end thereof is coupled to the other of the upper and lower pulley assemblies or the rotating shaft of the other of the upper and lower pulley assemblies;
wherein at least one of the upper and lower pulley assemblies further comprises:
a rotating wheel that is coupled with the rotating shaft of the pulley on the other side surface opposing to one side surface of the pulley to which the cam is coupled, in which one of the two cam cables is coupled to the other side surface of the pulley, wound on the rotating wheel, and extended toward the other of the upper and lower pulley assemblies; and
a cam cable guide member one end of which is rotatably coupled to the rotating shaft of the pulley separately from the pulley, at one side of the rotating wheel, in which the cam cable guide member is extended by a predetermined length along one of the cam cables extended toward the other of the upper and lower pulley assemblies from the rotating wheel, and at the other end of which a support member for supporting one of the cam cables is formed in order to make a portion of one of the cam cables extended from the rotating wheel guided in parallel with the pulley.
2. The compound bow of claim 1 , wherein the rotating wheel is rotatably coupled to the rotating shaft separately from the pulley.
3. The compound bow of claim 1 , wherein the support member of the cam cable guide member comprises a guide pulley and a support pulley that are respectively rotatably coupled to two shaft members respectively located at both sides of the cam cable, in which the cam cable is supported between the guide pulley and the support pulley.
4. The compound bow of claim 3 , wherein a guide groove for guiding the cam cable is formed on an outer circumferential surface of the guide pulley.
5. The compound bow of claim 3 , wherein the support pulley is formed at the front of the guide pulley, and is located at a longer distance from the rotating shaft of the cam cable guide member than the guide pulley.
6. The compound bow of claim 5 , wherein the support pulley is formed to have an outer diameter of an outer circumferential surface of the support pulley that guides the cam cable in contact with the cam cable becomes smaller inwards, and thereby guides the cam cable to a cable guard that is coupled to the handle of the bow main body and pushes the cam cable in one direction.
7. The compound bow of claim 3 , further comprising a support bar one end of which is rotatably coupled to the rotating shaft separately from the pulley at the other side surface of the pulley to which the cam cable guide member is coupled, so as to oppose the cam cable guide member, and at the other end of which two support protrusions are formed for supporting each of the guide pulley and the pulley support of the cam cable guide member.
8. The compound bow of claim 1 , wherein two coupling portions to which the rotating shaft is coupled are formed at one end of the cam cable guide member, in which the two coupling portions are coupled to the rotating shaft at both sides of one of two branches adjacent to the rotating wheel of the two branches that form a rear portion of the limbs.
9. The compound bow of claim 8 , wherein the cam cable guide member is made in an arch-shaped form.
10. The compound bow of claim 8 , wherein the support member of the cam cable guide member comprises a guide pulley and a support pulley that are rotatably coupled to two shaft members located at both sides of the cam cable, in which the cam cable is supported between the guide pulley and the support pulley.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020130100228A KR101362052B1 (en) | 2013-08-23 | 2013-08-23 | Compound bow |
KR10-2013-0100228 | 2013-08-23 | ||
KR1020130164958A KR101372263B1 (en) | 2013-12-27 | 2013-12-27 | Compound bow |
KR10-2013-0164958 | 2013-12-27 |
Publications (1)
Publication Number | Publication Date |
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US20150053191A1 true US20150053191A1 (en) | 2015-02-26 |
Family
ID=52479243
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/465,281 Abandoned US20150053191A1 (en) | 2013-08-23 | 2014-08-21 | Compound bow |
Country Status (1)
Country | Link |
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US (1) | US20150053191A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150136107A1 (en) * | 2011-02-14 | 2015-05-21 | Christoph OKUPNIAK | Compound bow with rigid deflecting stop |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3987777A (en) * | 1975-02-10 | 1976-10-26 | Darlington Rex F | Force multiplying type archery bow |
US6247466B1 (en) * | 2000-02-11 | 2001-06-19 | Mcpherson Mathew A. | Dual feed pivoting feed-out |
US6776148B1 (en) * | 2003-10-10 | 2004-08-17 | John J. Islas | Bowstring cam arrangement for compound bow |
US20090272493A1 (en) * | 2008-05-05 | 2009-11-05 | Joe & Samia Management Inc. | Labeller |
-
2014
- 2014-08-21 US US14/465,281 patent/US20150053191A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3987777A (en) * | 1975-02-10 | 1976-10-26 | Darlington Rex F | Force multiplying type archery bow |
US6247466B1 (en) * | 2000-02-11 | 2001-06-19 | Mcpherson Mathew A. | Dual feed pivoting feed-out |
US6776148B1 (en) * | 2003-10-10 | 2004-08-17 | John J. Islas | Bowstring cam arrangement for compound bow |
US20090272493A1 (en) * | 2008-05-05 | 2009-11-05 | Joe & Samia Management Inc. | Labeller |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150136107A1 (en) * | 2011-02-14 | 2015-05-21 | Christoph OKUPNIAK | Compound bow with rigid deflecting stop |
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