Mechanical guns and projectors – Spring – Bow
Reexamination Certificate
2000-02-11
2001-05-29
Ricci, John A. (Department: 3712)
Mechanical guns and projectors
Spring
Bow
C124S025000, C124S900000
Reexamination Certificate
active
06237582
ABSTRACT:
BACKGROUND OF THE INVENTION
The compound bow is generally characterized by the presence of one or more leveraging devices, typically on the distal ends of the bows limbs. The leveraging devices are used to generate a mechanical advantage favoring the archer. As a compound bow is drawn, the force required to displace the bowstring increases rapidly to a maximum value, typically prior to reaching the mid-point of the draw cycle. At some point beyond mid-draw, the force required to displace the bow string an additional amount decreases with each additional increment of displacement. As a result, at full draw the archer is only required to exert a fraction of the maximum force that was required to initially draw the bow.
One of the earliest compound bows is described in U.S. Pat. No. 3,486,495 to Allen. Although Allen discloses the use of programmed cams, such cams did not actually appear in the marketplace until the advent of computer numerically controlled (CNC) machinery made them economically feasible to produce and sell.
With the advent of CNC machinery, the state of the art has progressed from circular cam profiles to programmed noncircular profiles that result in the ability to store more energy in the bow and therefore provide more energy to accelerate an arrow to a higher launch velocity.
Improvements in cam design have been accompanied by advances in the design of the cable rigging. Some of the early compound bows had auxiliary intermediate idler pulleys with their anchor cables adjustably fastened to the handle sections of the bows. Typically, such bows had two cam elements each mounted independently and requiring very meticulous adjustments to each to synchronize the action of the two cam elements to achieve optimum performance.
More recent dual cam bows have been rigged such that the anchor cables of one cam were secured to the axle which mounts the opposite cam. This tied the system together and provided a degree of corrective feedback that made it difficult to detect discrepancies in eccentric wheel synchronization.
Unfortunately, however, with the advent of programmed cams that were capable of storing even more energy, the cam synchronization problem reappeared and the problem increased with increases in energy storage capability combined with progressively lower holding weights.
The innovation of the dual feed-out single take-up single cam compound bow, disclosed inter alia, in U.S. Pat. No. 5,368,006 provided a major step forward in the simplification of the compound bow.
The background of compound bow development is well documented in the patents that have been granted in this area and for a deeper understanding of the state of the art one can find additional information in the following patents and the patents which they reference:
U.S. Pat. No.
Issued To
3,841,295
Hunter
3,854,467
Hofmeister
3,958,551
Ketchum
4,440,142
Simonds
4,838,236
Kudlacek
5,040,520
Nurney
5,307,787
LaBorde et al.
5,368,006
McPherson
5,505,185
Miller
5,678,529
Larson
For the purpose of this disclosure, all U.S. patents and patent applications and all other publications referenced herein are incorporated herein by reference in their entirety.
BRIEF SUMMARY OF THE INVENTION
The present invention is directed in one embodiment to an archery bow comprising a handle portion, an upper limb supported by the handle portion and a lower limb supported by the handle portion. A top pulley is rotatably mounted upon the upper limb for rotation about a first axle. The top pulley includes a pulley track. A bottom cam assembly is rotatably mounted upon the lower limb for rotation about a second axle. The bottom cam assembly has a primary string payout track and a secondary string payout track. The pulley track and at least one of the primary string payout track and the secondary string payout track are coplanar. Desirably, the pulley track and the primary string payout track are coplanar.
The archery bow may further comprise a first cable having a first end portion terminating in a first end anchored to the bottom cam assembly and a second end portion terminating in a second end anchored to the bottom cam assembly. The first end portion is received in the primary string payout track, the second end portion is received in the secondary string payout track. A portion of the first cable is trained about the top pulley and received in the pulley track to form a bow-string section and a return section.
Where the bottom cam assembly further comprises a takeup track, the archery bow may further comprise an anchor cable extending between the upper limb and the bottom cam assembly and received in the take-up track.
The instant invention is also directed to an archery bow having a rotatably mounted pulley with a track and a dual feed-out cam with a larger track and smaller track, wherein the improvement comprises at least one of the larger track and the smaller track being coplanar with a track on the pulley.
In another embodiment, the instant invention is directed to an archery bow comprising a handle portion having a longitudinal axis, an upper limb supported by the handle portion and a lower limb supported by the handle portion. A top pulley is rotatably mounted upon the upper limb for rotation about a first axle. The top pulley includes a pulley track. A bottom cam assembly is rotatably mounted upon the lower limb for rotation about a second axle. The bottom cam assembly has a primary string payout track and a secondary string payout track. A first cable is provided having a first end portion terminating in a first end anchored to the bottom cam assembly and a second end portion terminating in a second end anchored to the bottom cam assembly. The first end portion is received in the primary string payout track and the second end portion is received in the secondary string payout track. A portion of the first cable is trained about the top pulley and received in the pulley track to form a bow-string section and a return section. The bow-string section is parallel to the longitudinal axis of the handle.
REFERENCES:
patent: D. 331614 (1992-12-01), Martin et al.
patent: 3841295 (1974-10-01), Hunter
patent: 3854467 (1974-12-01), Hofmeister
patent: 3958551 (1976-05-01), Ketchum
patent: 3993039 (1976-11-01), Groves et al.
patent: 4372285 (1983-02-01), Simonds et al.
patent: 4401097 (1983-08-01), Simonds et al.
patent: 4438753 (1984-03-01), Simonds
patent: 4440142 (1984-04-01), Simonds
patent: 4458657 (1984-07-01), Stockmar
patent: 4461267 (1984-07-01), Simonds et al.
patent: 4478203 (1984-10-01), Hayes
patent: 4512326 (1985-04-01), Jarrett
patent: 4649891 (1987-03-01), Bozek
patent: 4660536 (1987-04-01), McPherson
patent: 4693228 (1987-09-01), Simonds et al.
patent: 4827894 (1989-05-01), Schallberger
patent: 4838236 (1989-06-01), Kudlacek
patent: 4909231 (1990-03-01), Larson
patent: 4993399 (1991-02-01), Chattin
patent: 5005554 (1991-04-01), Shepley et al.
patent: 5025771 (1991-06-01), Hanson
patent: 5040520 (1991-08-01), Nurney
patent: 5174268 (1992-12-01), Martin et al.
patent: 5307787 (1994-05-01), LaBorde et al.
patent: 5368006 (1994-11-01), McPherson
patent: 5495843 (1996-03-01), Larson
patent: 5505185 (1996-04-01), Miller
patent: 5515836 (1996-05-01), Martin et al.
patent: 5649520 (1997-07-01), Bednar
patent: 5678529 (1997-10-01), Larson
patent: 5782229 (1998-07-01), Evans et al.
patent: 5809982 (1998-09-01), McPherson
patent: 5884614 (1999-03-01), Darlington et al.
patent: 5934265 (1999-08-01), Darlington
Bow & Arrow publication of Apr. 1980.
Bow & Arrow publication Dec. 1975.
Advertising from Allen, The Original Compound Bow, Dec. 1975.
Dynabo (Models M-10 Cheetah & Jim Cox Magnum) Instruction Manual Excerpt, mid-1970's.
KAM-Act “MK-2” Instruction Manual Excerpt, early-1970's.
KAM-Act Instruction Manual Excerpt for Martin Archery, Inc., “New for '74”, mid-1970's.
Ben Pearson Archery advertisement.
Hoyt Archery advertisement.
Browning advertisement.
McPherson Mathew A.
Ricci John A.
Vidas Arrett & Steinkraus
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