US20080173289A1 - Dual-feed single-cam compound bow - Google Patents
Dual-feed single-cam compound bow Download PDFInfo
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- US20080173289A1 US20080173289A1 US11/867,387 US86738707A US2008173289A1 US 20080173289 A1 US20080173289 A1 US 20080173289A1 US 86738707 A US86738707 A US 86738707A US 2008173289 A1 US2008173289 A1 US 2008173289A1
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- Prior art keywords
- cam
- bow
- cable
- bowstring
- groove
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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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S124/00—Mechanical guns and projectors
- Y10S124/90—Limb tip rotatable element structure
Definitions
- cams consisting of eccentrically mounted circular shaped elements.
- special shaped cam elements were designed to provide these characteristics.
- These shaped cam elements like the circular shaped elements, were mounted on the limb tips. It is well known in the art that to obtain the best bow performance, the cam elements at each end of the bow should be properly synchronized with each other. Patents disclosing various means to accomplish proper cam synchronization include the following:
- the Dynabo single cam concept was offered in at least three different versions from as many manufacturers during the 1970's, and at least one manufacturer, Graham's Custom Bows, employed the Dynabo concept, with two working limbs.
- Graham's Custom Bows employed the Dynabo concept, with two working limbs.
- a description of the Graham bow is contained in the June/July edition of “Archery World” magazine.
- the Dynabo bow never did become an acceptable alternative to the two cam bows and, in fact, appears to have lost whatever popularity it had achieved by the late 1970's.
- the cam also has two additional tracks, each of which are taking up line while the string tracks are feeding out line to the bow string.
- One take-up track is taking up a line which is anchored at one limb tip while the other take-up track is taking up a line which is anchored at the opposite limb tip.
- a single cam bow developed by Larry D. Miller in the late 1970's or early 1980's was the subject of a U.S. patent application titled “Archery Bow Assembly” (hereinafter referred to as the “Miller application”).
- the Miller application discloses the use of a single pulley, having two grooves thereon for feeding out line to the bow string.
- the primary groove is circular and concentric with the axle of the circular pulley.
- the secondary groove also circular, may be slightly eccentric for the purpose of maintaining the nocking point of the bowstring perpendicular to the handle section of the bow.
- a third eccentric groove carries a take-up cable to provide the entire means of compounding (i.e. achieving the desired reduction in holding weight at full draw and storage of energy).
- the Miller application may be considered material to the examination of the subject application. At least one bow was constructed which embodied the teachings of the Miller application, the applicant is unaware of the commercialization of any such bow. Thus, it is believed that the disclosure in the Miller application has been abandoned.
- the present invention embodies a simple, lightweight compound bow construction which solves the cam synchronization problem of two cam bows and overcomes the problems of synchronously feeding out cable to the upper and lower ends of the bowstring.
- the resulting bow has a smooth, desirable nocking point travel path which enables ease in matching arrows to the bow and provides consistency in performance.
- a cam is eccentrically journaled at one limb end of the bow and a pulley is journaled at the other limb end of the bow.
- a cable passes around the pulley to form a bowstring section and a second cable section, both sections forming a dual feed single cam compound bow.
- the amount of feed out to both ends of the bowstring is approximately the same.
- One embodiment of the drop-off cam provides a large periphery cam groove and a smaller periphery cam groove which are designed to synchronize the rate of cable feed-out at both ends of the bowstring section during the drawing operation. Other embodiments of the invention are also disclosed.
- An anchor cable is provided to tie the two limbs of the bow together during the flexing of the bow.
- the anchor cable may be fixed at one end to the axle of the concentric pulley and at the other end fixed in a groove in the cam to synchronize the flexing action of the bow limbs.
- FIG. 1 is a side elevational view showing one embodiment of the invention
- FIG. 2 is a side elevational view of the cam shown in FIG. 1 ;
- FIG. 3 is the opposite side elevational view of the cam shown in FIG. 2 ;
- FIG. 4 is a top plan view of the cam taken along line 4 - 4 of FIG. 3 ;
- FIG. 5 is a rear elevational view of the upper limb tip portion of the archery bow of the present invention showing the anchor cable mounting on the concentric pulley axle;
- FIG. 6 is a view of the unassembled anchor cable of the present invention.
- FIG. 7 is a side elevational view, similar to the view, shown in FIG. 2 , and showing an alternative embodiment of the cam of the present invention
- FIG. 8 is a side elevational view, similar to the view shown in FIG. 2 , and showing another embodiment of the cam of the present invention.
- FIG. 9 is a side elevational view, similar to the view shown in FIG. 2 , and showing a still further embodiment of the cam of the present invention.
- FIG. 10 is the opposite side elevational view of the cam shown in FIG. 9 ;
- FIG. 11 is a top plan view taken along line 11 - 11 of the cam shown in FIG. 10 ;
- FIG. 12 is a side elevational view similar to the view shown in FIG. 2 , and showing a still further embodiment of the cam of the present invention
- FIG. 13 is the opposite side elevational view of the cam shown in FIG. 12 ;
- FIG. 14 is a top plan view taken along line 14 - 14 of the cam shown in FIG. 13 ;
- FIG. 15 is a side elevational view similar to the view shown in FIG. 2 , and showing a still further embodiment of the cam of the present invention
- FIG. 16 is the opposite side elevational view of the cam shown in FIG. 15 ;
- FIG. 17 is a top plan view taken along line 17 - 17 of the cam shown in FIG. 16 .
- an archery bow assembly B which includes a central handle portion 10 , having a pair of limbs 12 and 14 , connected at their inner ends in fixed relation to the handle portion 10 .
- the limbs 12 and 14 provide the desired resistance to bending which determines the draw weight of the bow and the force with which the arrow is discharged.
- the outer ends of the bow limbs provide wheel receiving slots which define wheel mounting forks, respectively designated by the numbers 12 a and 14 a , for mounting axle pins 15 and 16 .
- a pulley 17 is concentrically mounted on the axle pin 15 .
- the pulley 17 is provided with a single groove.
- an eccentric drop-off cam 18 is mounted on axle pin 16 and has three eccentrically oriented grooves, 18 a , 18 b , and 18 c formed in the outer periphery thereof to provide three separate cable groove paths.
- a cable 22 has a medial portion trained around concentric pulley wheel 17 to form a main cable section or bowstring 22 a and a secondary or return section 22 b , both of which extend across the bow and terminate at the cam 18 .
- the ends 22 c and 22 d of the two sections 22 a and 22 b are respectively received in grooves 18 b and 18 c of the cam 18 .
- the end 22 c and 22 d of the sections 22 a and 22 b are anchored to the cam 18 as by the cable anchor pins 19 a and 19 b fixed in said cam 18 , as best shown in FIG. 3 .
- three anchor pins 19 a are provided to permit adjustment of the effective length of cable 22 and bowstring 22 a.
- An anchor cable 25 is anchored at one end 25 a to the axle 15 (see FIGS. 5 and 6 ) by loops 31 on sections 31 a of anchor cable 25 encircling axle 15 . It is seen that loops 31 extend on both sides of pulley 17 to provide load balancing and thus prevent twisting of upper limb 12 .
- the other end of anchor cable 25 (as best shown in FIG. 2 ) passes around the cam groove 18 a on the take-up side of the cam 18 and has a loop 33 thereon which is attached to anchor pin 19 c and positively ties the ends of the bow limbs 12 and 14 together to form a direct connection between the limbs 12 and 14 .
- cam 18 is caused to rotate in the counterclockwise direction as viewed in FIG. 2 and bowstring 22 a is fed out from cam 18 in the direction of the generally vertical arrow adjacent bowstring 22 a in FIG. 1 .
- Counterclockwise rotation of cam 18 likewise causes return section 22 b to be fed out from cam 18 in the direction toward pulley 17 .
- Return section 22 b moves upwardly to the take-up side of concentric pulley 17 , around and past the pulley 17 to become the second feed-out portion 22 a of bowstring 22 .
- counterclockwise rotation of cam 18 causes anchor cable 25 to be taken up in groove 18 a of cam 18 to cause the synchronized flexing of the bow limbs 12 and 14 .
- FIGS. 7 and 8 Alternative forms of the invention are illustrated in FIGS. 7 and 8 , but in each case the dual-feed-out cable sections 22 a and 22 b operate and extend outwardly from a drop-off cam unit mounted on the limb 14 of the bow in the same manner, as described for the embodiment shown in FIGS. 1-4 .
- an eccentric drop-off cam 27 is illustrated having the feed-out cable sections 22 a and 22 b extending outwardly therefrom toward the concentric pulley 17 .
- the cam 27 has a single groove 27 b extending all around its complete periphery with the cable sections 22 a and 22 b received in the groove 27 b .
- the ends of the cable sections are anchored to an anchor pin 27 a fixed to one side of the cam 27 .
- the anchor cable 25 is also received in groove 27 b and securely anchored to the anchor pin 27 a , as shown in FIG. 7 .
- FIG. 8 Another alternative form of the cam is illustrated in FIG. 8 which embodies eccentric drop-off cam 28 having a groove 28 b thereon wherein cable sections 22 a and 22 b are received.
- a suitable anchor pin 28 a is provided on the back side of the cam 28 as shown by dotted lines in FIG. 8 and both ends of cable sections 22 a and 22 b are secured thereto in the same manner as previously described.
- the anchor cable 25 is trained in groove 29 of cam 28 and secured to the anchor pin 29 a of cam 28 as shown in FIG. 8 .
- Cam 28 is eccentrically mounted on axle pin 16 connected to the limb 14 of the bow.
- the embodiment of the cam shown in FIGS. 9 to 11 also operates in the manner as the eccentric cam illustrated in FIGS. 1 to 4 .
- the eccentric drop-off cam 30 has the feed out sections 22 a and 22 b extending outwardly therefrom toward the concentric pulley 17 (not shown).
- Feed out section 22 a is received in a first groove 32 of cam 30 and feed out section 22 b is received in a second groove 34 of smaller periphery of cam 30 which is located on one side of groove 32 of cam 30 .
- Anchor cable 25 is located in groove 36 of cam 30 , which also is located on the side opposite of groove 32 from groove 34 of cam 30 .
- Feed out section 22 a may be attached to either anchor pin 37 (as shown) or anchor pin 38 on cam 30 , and in this manner the effective length of feed out section 22 a may be adjusted to change draw length.
- Feed out section 22 b also as best seen in FIG. 10 , is attached to anchor pin 40 on cam 30 .
- Anchor cable 25 is attached to anchor pin 42 which is located on the side of cam 30 opposite anchor pins 36 , 38 and 40 .
- cam 30 is eccentrically mounted on the axle pin 16 connected to the limb 14 of the bow.
- the embodiment of the cam shown in FIGS. 12 to 14 likewise operates in the manner as the eccentric cam illustrated in FIGS. 1 to 4 .
- the eccentric drop off cam 44 has the feed out sections 22 a and 22 b extending outwardly therefrom toward the concentric pulley 17 (not shown).
- Feed out section 22 a is received in a first groove 46 of cam 44 and feed out section 22 b is received in a second groove 48 of smaller periphery of cam 44 which is located outwardly of the center line of groove 46 of cam 44 .
- Anchor cable 25 is located in groove 50 of cam 44 , which also is located outwardly of the center line of groove 46 of cam 44 .
- Feed out section 22 a may be attached to either anchor pin 52 (as partially shown) or anchor pin 54 or anchor pin 56 on cam 44 and in this manner the effective length of the feed out section 22 a may be adjusted.
- Feed out section 22 b also as best seen in FIG. 13 , is attached to anchor pin 58 on cam 44 .
- Anchor cable 25 is attached to anchor pin 60 which is located on the side of cam 44 opposite anchor pins 52 , 54 , 56 and 58 .
- cam 44 is eccentrically mounted on the axle pin 16 connected to the limb 14 of the bow.
- the embodiment of the cam shown in FIGS. 15 to 17 operates in the manner as the eccentric cam illustrated in FIGS. 1 to 4 .
- the eccentric drop off cam 68 has the feed out sections 22 a and 22 b extending outwardly therefrom toward the concentric pulley 17 (not shown).
- Feed. out section 22 a is received in a first groove 70 of cam 68 and feed. out section 22 b is received in a second smaller periphery groove 72 of cam 68 .
- Anchor cable 25 is located in groove 74 of cam 68 , which is located intermediate of grooves 70 and 72 of cam 68 .
- Feed out section 22 a may be attached to either anchor pin 74 (as shown) or anchor pin 76 on cam 68 and in this manner the effective length of feed outsection 22 a may be adjusted.
- Feed out section 22 b is attached to anchor pin 78 on cam 68 .
- Anchor cable 25 is attached to anchor pin 80 which is located on cam 68 .
- cam 68 is eccentrically mounted on the axle pin 16 connected to the limb 14 of the bow.
- a desirable approach to designing the grooves in the cam is to initially have the groove which receives bowstring 22 a (the “primary groove”) be approximately twice the peripheral size of the groove which receives the bowstring 22 b (the “secondary groove”).
- the size of the primary groove may, for example, be the peripheral size of a cam on a standard bow having two independent cams.
- a starting point for the design of the groove which receives anchor cable 25 (the “take up groove”) for use on limbs having relatively low spring rates and relatively longer limb tip travel may be, for example, to have the size and shape of the take up groove be approximately the same size and shape as the primary groove.
- the take up cam size will be smaller than that of the primary feed cam for a given peak draw weight. Conversely, if one desires limbs having a lower spring rate and desires to increase limb tip travel, the take up cam size would be larger than that of the primary feed cam for a given peak draw weight.
- the final shape of the take up cam will depend on the energy storage characteristics that are desired. Adjustments of the peripheral size and shape will then be made to the secondary groove to assure that the nocking point travels in a smooth path during the draw cycle.
- the bowstring is drawn at discrete draw length intervals, for example, at draw length intervals of one inch and at each such interval the nocking point position and travel is analyzed and, if required, the secondary groove is made either peripherally larger or smaller to assure that the nocking point travels a smooth path between intervals.
- the resulting single cam compound bow will, among other desirable features, be provided with a smooth nocking point path of travel. It should be noted that the amount of stored energy will be directly related to the leverage ratios between the primary, secondary groove shapes and will depend on the combined effect of the two bowstring let off leverage arms as compared to the leverage arm of the bowstring take up side.
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Abstract
Description
- This application claims the benefit of and is a continuation of application Ser. No. 10/934,630, filed Sep. 3, 2004, which is a reissue of application Ser. No. 09/160,983, filed Sep. 25, 1998, now U.S. Pat. No. 6,443,139, which is a continuation of application Ser. No. 08/047,481, filed Apr. 19, 1993, now U.S. Pat. No. 5,890,480, which is a continuation-in-part of application Ser. No. 07/875,748, filed Apr. 28, 1992, now U.S. Pat. No. 5,368,006.
- In the past, most compound archery bows have used two cams, respectively mounted on the limb tips at opposite ends of the bow to provide the means to store more energy in the draw cycle and to reduce the force necessary to hold the bowstring in the full draw position. Examples of such compound bows are disclosed in the following U.S. patents.
- U.S. patent No. Issued To Date Issued U.S. Pat. No. 3,486,495 Allen Jun. 23, 1966 U.S. Pat. No. 3,890,951 Jennings, et al. Jun. 24, 1975 U.S. Pat. No. 4,060,066 Kudlacek Nov. 29, 1977 U.S. Pat. No. 4,079,723 Darlington Mar. 21, 1978 U.S. Pat. No. 4,112,909 Caldwell Sep. 12, 1978 U.S. Pat. No. 4,300,521 Schmitt Nov. 17, 1981.
- The early compound bows utilized cams consisting of eccentrically mounted circular shaped elements. As the desire for more stored energy and greater arrow velocities developed, special shaped cam elements were designed to provide these characteristics. These shaped cam elements, like the circular shaped elements, were mounted on the limb tips. It is well known in the art that to obtain the best bow performance, the cam elements at each end of the bow should be properly synchronized with each other. Patents disclosing various means to accomplish proper cam synchronization include the following:
- U.S. patent No. Issued To Date Issued U.S. Pat. No. 3,841,295 Hunger Oct. 15, 1974 U.S. Pat. No. 3,958,551 Ketchum May 25, 1976 U.S. Pat. No. 4,103,667 Shepley, Jr. Aug. 1, 1978 U.S. Pat. No. 4,178,905 Groner Dec. 18, 1979
- The more modern compound bows have reverted back to the more simplistic design of the original U.S. Pat. No. 3,486,495 Allen patent, but the requirement for cam synchronization is still present as noted, for example, by the teachings of the following patents:
- U.S. patent No. Issued To Date Issued U.S. Pat. No. 4,372,285 Simonds Feb. 8, 1983 U.S. Pat. No. 4,440,142 Simonds Apr. 3, 1984 U.S. Pat. No. 4,909,231 Larson Mar. 20, 1990
- It is obvious, of course, that the use of a single cam avoids the problem of cam synchronization and, in fact, there are single cam bows known in the prior art. One such bow, popularly referred to as the “DynaBo” was invented by Len Subber. The original Dynabo design had one working limb located at the upper end of the bow handle. A single cam element was mounted on a rigid pylori at the lower end of the bow. The single cam element functioned in the same manner as the cam elements on the previously mentioned two cam bows. As the Dynabo was drawn, one track of the cam element payed out line to the bowstring which was fixed to the upper limb tip and the other track on the cam element acted as a take-up reel for a second line that was also anchored at the tip of the upper working limb.
- Since there was only a single cam element, there was not a synchronization problem between two cams. There was, however, a problem in synchronizing the rate that the cam fed out cables to the bowstring at the lower end of the bow and the rate that the flexing of the upper limb feed out cable to the bowstring at the upper end as the bow was drawn. The result was a rather unpleasant feel to the bow as it was drawn and there was a drastic movement of the nocking point and the rear end of the arrow as the bow was drawn and released. This, in turn, made it very difficult to achieve good arrow flight from the bow under normal conditions. An early version of the DynaBo was described in the September 1976 edition of “Archery World” beginning at
page 28. - The Dynabo single cam concept was offered in at least three different versions from as many manufacturers during the 1970's, and at least one manufacturer, Graham's Custom Bows, employed the Dynabo concept, with two working limbs. A description of the Graham bow is contained in the June/July edition of “Archery World” magazine. The Dynabo bow, however, never did become an acceptable alternative to the two cam bows and, in fact, appears to have lost whatever popularity it had achieved by the late 1970's.
- Another known prior art device that had the capability of providing a solution to the previously mentioned problems of cam synchronization and synchronized bow string feed out (the latter being desirable to enable the nock end of the arrow to travel in a smooth, consistent path upon draw and release of the arrow) is set forth in U.S. Pat. No. 4,562,824 issued to Jennings. This patent teaches the use of a single multiple grooved cam mounted on a pylori attached to the bow handle. The cam had one string track feeding cable attached to an idler pulley mounted in the limb tip at one end of the bow and a second track feeding line to a second idler pulley mounted in the second limb tip at the other end of the bow. The cam also has two additional tracks, each of which are taking up line while the string tracks are feeding out line to the bow string. One take-up track is taking up a line which is anchored at one limb tip while the other take-up track is taking up a line which is anchored at the opposite limb tip. Thus, the '824 patent teaches a highly complicated system, as compared to the present invention, that is composed of considerably more parts resulting in a compound bow having greater mass weight than the more conventional two cam compound bow.
- A single cam bow developed by Larry D. Miller in the late 1970's or early 1980's was the subject of a U.S. patent application titled “Archery Bow Assembly” (hereinafter referred to as the “Miller application”). The Miller application discloses the use of a single pulley, having two grooves thereon for feeding out line to the bow string. The primary groove is circular and concentric with the axle of the circular pulley. The secondary groove, also circular, may be slightly eccentric for the purpose of maintaining the nocking point of the bowstring perpendicular to the handle section of the bow. A third eccentric groove carries a take-up cable to provide the entire means of compounding (i.e. achieving the desired reduction in holding weight at full draw and storage of energy).
- The Miller application, the serial number of which is not known, may be considered material to the examination of the subject application. At least one bow was constructed which embodied the teachings of the Miller application, the applicant is unaware of the commercialization of any such bow. Thus, it is believed that the disclosure in the Miller application has been abandoned.
- The present invention embodies a simple, lightweight compound bow construction which solves the cam synchronization problem of two cam bows and overcomes the problems of synchronously feeding out cable to the upper and lower ends of the bowstring. The resulting bow has a smooth, desirable nocking point travel path which enables ease in matching arrows to the bow and provides consistency in performance.
- A cam is eccentrically journaled at one limb end of the bow and a pulley is journaled at the other limb end of the bow. A cable passes around the pulley to form a bowstring section and a second cable section, both sections forming a dual feed single cam compound bow. The amount of feed out to both ends of the bowstring is approximately the same. One embodiment of the drop-off cam provides a large periphery cam groove and a smaller periphery cam groove which are designed to synchronize the rate of cable feed-out at both ends of the bowstring section during the drawing operation. Other embodiments of the invention are also disclosed.
- An anchor cable is provided to tie the two limbs of the bow together during the flexing of the bow. The anchor cable may be fixed at one end to the axle of the concentric pulley and at the other end fixed in a groove in the cam to synchronize the flexing action of the bow limbs.
-
FIG. 1 is a side elevational view showing one embodiment of the invention; -
FIG. 2 is a side elevational view of the cam shown inFIG. 1 ; -
FIG. 3 is the opposite side elevational view of the cam shown inFIG. 2 ; -
FIG. 4 is a top plan view of the cam taken along line 4-4 ofFIG. 3 ; -
FIG. 5 is a rear elevational view of the upper limb tip portion of the archery bow of the present invention showing the anchor cable mounting on the concentric pulley axle; -
FIG. 6 is a view of the unassembled anchor cable of the present invention; -
FIG. 7 is a side elevational view, similar to the view, shown inFIG. 2 , and showing an alternative embodiment of the cam of the present invention; -
FIG. 8 is a side elevational view, similar to the view shown inFIG. 2 , and showing another embodiment of the cam of the present invention; -
FIG. 9 is a side elevational view, similar to the view shown inFIG. 2 , and showing a still further embodiment of the cam of the present invention; -
FIG. 10 is the opposite side elevational view of the cam shown inFIG. 9 ; -
FIG. 11 is a top plan view taken along line 11-11 of the cam shown inFIG. 10 ; -
FIG. 12 is a side elevational view similar to the view shown inFIG. 2 , and showing a still further embodiment of the cam of the present invention; -
FIG. 13 is the opposite side elevational view of the cam shown inFIG. 12 ; -
FIG. 14 is a top plan view taken along line 14-14 of the cam shown inFIG. 13 ; -
FIG. 15 is a side elevational view similar to the view shown inFIG. 2 , and showing a still further embodiment of the cam of the present invention; -
FIG. 16 is the opposite side elevational view of the cam shown inFIG. 15 ; and -
FIG. 17 is a top plan view taken along line 17-17 of the cam shown inFIG. 16 . - In
FIG. 1 of the accompanying drawings, an archery bow assembly B is illustrated which includes acentral handle portion 10, having a pair oflimbs handle portion 10. Thelimbs - As shown in
FIGS. 1-4 , the outer ends of the bow limbs provide wheel receiving slots which define wheel mounting forks, respectively designated by thenumbers pulley 17 is concentrically mounted on theaxle pin 15. In this form of the invention, thepulley 17 is provided with a single groove. As shown inFIGS. 2-4 , an eccentric drop-off cam 18 is mounted onaxle pin 16 and has three eccentrically oriented grooves, 18 a, 18 b, and 18 c formed in the outer periphery thereof to provide three separate cable groove paths. - A
cable 22 has a medial portion trained aroundconcentric pulley wheel 17 to form a main cable section orbowstring 22 a and a secondary or returnsection 22 b, both of which extend across the bow and terminate at thecam 18. The ends 22 c and 22 d of the twosections grooves cam 18. The end 22 c and 22 d of thesections cam 18 as by the cable anchor pins 19 a and 19 b fixed in saidcam 18, as best shown inFIG. 3 . In the form shown, three anchor pins 19 a are provided to permit adjustment of the effective length ofcable 22 andbowstring 22 a. - An
anchor cable 25 is anchored at oneend 25 a to the axle 15 (seeFIGS. 5 and 6 ) byloops 31 onsections 31 a ofanchor cable 25 encirclingaxle 15. It is seen thatloops 31 extend on both sides ofpulley 17 to provide load balancing and thus prevent twisting ofupper limb 12. The other end of anchor cable 25 (as best shown inFIG. 2 ) passes around thecam groove 18 a on the take-up side of thecam 18 and has aloop 33 thereon which is attached to anchorpin 19 c and positively ties the ends of thebow limbs limbs - The operation of the archery bow having the eccentric cam illustrated in
FIGS. 1-4 will next be described. When the archer draws thebowstring 22 a,cam 18 is caused to rotate in the counterclockwise direction as viewed inFIG. 2 and bowstring 22 a is fed out fromcam 18 in the direction of the generally vertical arrowadjacent bowstring 22 a inFIG. 1 . Counterclockwise rotation ofcam 18 likewise causes returnsection 22 b to be fed out fromcam 18 in the direction towardpulley 17.Return section 22 b moves upwardly to the take-up side ofconcentric pulley 17, around and past thepulley 17 to become the second feed-outportion 22 a ofbowstring 22. At the same time that thebowstring section 22 a is fed out, counterclockwise rotation ofcam 18 causes anchorcable 25 to be taken up ingroove 18 a ofcam 18 to cause the synchronized flexing of thebow limbs - Alternative forms of the invention are illustrated in
FIGS. 7 and 8 , but in each case the dual-feed-outcable sections limb 14 of the bow in the same manner, as described for the embodiment shown inFIGS. 1-4 . In theFIG. 7 embodiment, an eccentric drop-off cam 27 is illustrated having the feed-outcable sections concentric pulley 17. Thecam 27 has asingle groove 27 b extending all around its complete periphery with thecable sections groove 27 b. The ends of the cable sections are anchored to ananchor pin 27 a fixed to one side of thecam 27. Theanchor cable 25 is also received ingroove 27 b and securely anchored to theanchor pin 27 a, as shown inFIG. 7 . - Another alternative form of the cam is illustrated in
FIG. 8 which embodies eccentric drop-off cam 28 having a groove 28 b thereon whereincable sections cam 28 as shown by dotted lines inFIG. 8 and both ends ofcable sections anchor cable 25 is trained ingroove 29 ofcam 28 and secured to theanchor pin 29 a ofcam 28 as shown inFIG. 8 .Cam 28 is eccentrically mounted onaxle pin 16 connected to thelimb 14 of the bow. - The embodiment of the cam shown in
FIGS. 9 to 11 also operates in the manner as the eccentric cam illustrated inFIGS. 1 to 4 . In this embodiment, the eccentric drop-off cam 30 has the feed outsections section 22 a is received in afirst groove 32 ofcam 30 and feed outsection 22 b is received in asecond groove 34 of smaller periphery ofcam 30 which is located on one side ofgroove 32 ofcam 30.Anchor cable 25, as best seen inFIGS. 9 and 11 , is located ingroove 36 ofcam 30, which also is located on the side opposite ofgroove 32 fromgroove 34 ofcam 30. - Feed out
section 22 a, as best seen inFIG. 10 , may be attached to either anchor pin 37 (as shown) oranchor pin 38 oncam 30, and in this manner the effective length of feed outsection 22 a may be adjusted to change draw length. Feed outsection 22 b, also as best seen inFIG. 10 , is attached to anchorpin 40 oncam 30.Anchor cable 25, as best seen inFIG. 9 , is attached to anchorpin 42 which is located on the side ofcam 30 opposite anchor pins 36, 38 and 40. As in the other embodiments,cam 30 is eccentrically mounted on theaxle pin 16 connected to thelimb 14 of the bow. - The embodiment of the cam shown in
FIGS. 12 to 14 likewise operates in the manner as the eccentric cam illustrated inFIGS. 1 to 4 . In this embodiment, the eccentric drop offcam 44 has the feed outsections section 22 a is received in afirst groove 46 ofcam 44 and feed outsection 22 b is received in asecond groove 48 of smaller periphery ofcam 44 which is located outwardly of the center line ofgroove 46 ofcam 44.Anchor cable 25, as best seen inFIG. 12 , is located ingroove 50 ofcam 44, which also is located outwardly of the center line ofgroove 46 ofcam 44. - Feed out
section 22 a, as best seen inFIG. 13 , may be attached to either anchor pin 52 (as partially shown) oranchor pin 54 oranchor pin 56 oncam 44 and in this manner the effective length of the feed outsection 22 a may be adjusted. Feed outsection 22 b, also as best seen inFIG. 13 , is attached to anchorpin 58 oncam 44.Anchor cable 25, as best seen inFIG. 12 , is attached to anchorpin 60 which is located on the side ofcam 44 opposite anchor pins 52, 54, 56 and 58. As in the other embodiments,cam 44 is eccentrically mounted on theaxle pin 16 connected to thelimb 14 of the bow. - The embodiment of the cam shown in
FIGS. 15 to 17 operates in the manner as the eccentric cam illustrated inFIGS. 1 to 4 . In this embodiment, the eccentric drop offcam 68 has the feed outsections section 22 a is received in afirst groove 70 ofcam 68 and feed. outsection 22 b is received in a secondsmaller periphery groove 72 ofcam 68.Anchor cable 25, as best seen inFIG. 16 , is located ingroove 74 ofcam 68, which is located intermediate ofgrooves cam 68. - Feed out
section 22 a, as best seen inFIG. 15 , may be attached to either anchor pin 74 (as shown) oranchor pin 76 oncam 68 and in this manner the effective length offeed outsection 22 a may be adjusted. Feed outsection 22 b, as best seen inFIG. 16 , is attached to anchorpin 78 oncam 68.Anchor cable 25, also as best seen inFIG. 16 , is attached to anchorpin 80 which is located oncam 68. As in the other embodiments,cam 68 is eccentrically mounted on theaxle pin 16 connected to thelimb 14 of the bow. - It has been found that a desirable approach to designing the grooves in the cam is to initially have the groove which receives
bowstring 22 a (the “primary groove”) be approximately twice the peripheral size of the groove which receives thebowstring 22 b (the “secondary groove”). The size of the primary groove may, for example, be the peripheral size of a cam on a standard bow having two independent cams. A starting point for the design of the groove which receives anchor cable 25 (the “take up groove”) for use on limbs having relatively low spring rates and relatively longer limb tip travel may be, for example, to have the size and shape of the take up groove be approximately the same size and shape as the primary groove. If, however, one desires limbs having a higher spring rate and desires to reduce limb tip travel, the take up cam size will be smaller than that of the primary feed cam for a given peak draw weight. Conversely, if one desires limbs having a lower spring rate and desires to increase limb tip travel, the take up cam size would be larger than that of the primary feed cam for a given peak draw weight. The final shape of the take up cam will depend on the energy storage characteristics that are desired. Adjustments of the peripheral size and shape will then be made to the secondary groove to assure that the nocking point travels in a smooth path during the draw cycle. To achieve this, the bowstring is drawn at discrete draw length intervals, for example, at draw length intervals of one inch and at each such interval the nocking point position and travel is analyzed and, if required, the secondary groove is made either peripherally larger or smaller to assure that the nocking point travels a smooth path between intervals. By continuing this process of modifying the size and shape of the secondary groove throughout the draw length, the resulting single cam compound bow will, among other desirable features, be provided with a smooth nocking point path of travel. It should be noted that the amount of stored energy will be directly related to the leverage ratios between the primary, secondary groove shapes and will depend on the combined effect of the two bowstring let off leverage arms as compared to the leverage arm of the bowstring take up side.
Claims (18)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/867,387 US20080173289A1 (en) | 1992-04-28 | 2007-10-04 | Dual-feed single-cam compound bow |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/875,748 US5368006A (en) | 1992-04-28 | 1992-04-28 | Dual-feed single-cam compound bow |
US08/047,481 US5890480A (en) | 1992-04-28 | 1993-04-19 | Dual-feed single-cam compound bow |
US09/160,983 US6443139B1 (en) | 1992-04-28 | 1998-09-25 | Dual-feel single-cam compound bow |
US10/934,630 USRE39880E1 (en) | 1992-04-28 | 2004-09-03 | Dual-feed single-cam compound bow |
US11/867,387 US20080173289A1 (en) | 1992-04-28 | 2007-10-04 | Dual-feed single-cam compound bow |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/934,630 Continuation USRE39880E1 (en) | 1992-04-28 | 2004-09-03 | Dual-feed single-cam compound bow |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080173289A1 true US20080173289A1 (en) | 2008-07-24 |
Family
ID=21949232
Family Applications (5)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/047,481 Expired - Lifetime US5890480A (en) | 1992-04-28 | 1993-04-19 | Dual-feed single-cam compound bow |
US08/390,056 Expired - Lifetime US5791322A (en) | 1992-04-28 | 1995-02-17 | Dual-feed single-cam compound bow |
US09/160,983 Ceased US6443139B1 (en) | 1992-04-28 | 1998-09-25 | Dual-feel single-cam compound bow |
US10/934,630 Expired - Fee Related USRE39880E1 (en) | 1992-04-28 | 2004-09-03 | Dual-feed single-cam compound bow |
US11/867,387 Abandoned US20080173289A1 (en) | 1992-04-28 | 2007-10-04 | Dual-feed single-cam compound bow |
Family Applications Before (4)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/047,481 Expired - Lifetime US5890480A (en) | 1992-04-28 | 1993-04-19 | Dual-feed single-cam compound bow |
US08/390,056 Expired - Lifetime US5791322A (en) | 1992-04-28 | 1995-02-17 | Dual-feed single-cam compound bow |
US09/160,983 Ceased US6443139B1 (en) | 1992-04-28 | 1998-09-25 | Dual-feel single-cam compound bow |
US10/934,630 Expired - Fee Related USRE39880E1 (en) | 1992-04-28 | 2004-09-03 | Dual-feed single-cam compound bow |
Country Status (4)
Country | Link |
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US (5) | US5890480A (en) |
EP (1) | EP0621456A1 (en) |
AU (1) | AU679485B2 (en) |
CA (1) | CA2121115C (en) |
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US7721721B1 (en) * | 2006-09-28 | 2010-05-25 | Precision Shooting Equipment, Inc. | Reversible and adjustable module system for archery bow |
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Also Published As
Publication number | Publication date |
---|---|
CA2121115A1 (en) | 1994-10-20 |
US5791322A (en) | 1998-08-11 |
CA2121115C (en) | 1999-09-21 |
US6443139B1 (en) | 2002-09-03 |
US20020096159A1 (en) | 2002-07-25 |
USRE39880E1 (en) | 2007-10-16 |
AU679485B2 (en) | 1997-07-03 |
EP0621456A1 (en) | 1994-10-26 |
US5890480A (en) | 1999-04-06 |
AU5931294A (en) | 1994-10-20 |
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