Patent US3851638A successfully refreshed from Google Patents.
US3851638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Force multiplying type archery bow
Assignee: KAM ACT ENTERPRISES Inc
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Filing: 1973-02-02
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Granted: 1974-12-03
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Expires: 1993-02-02
Abstract
Abstract An improved archery bow including an elongate rigid bow member having a central handle section and a pair of rigid limbs extending out from either end of the section. A pair of resilient limbs is mounted adjacent the ends of the handle section, extending outward from the handle sections. A pair of cam members is provided at each end of the rigid bow member which is connected to the bowstring and a resilient limb. The cam members provide a leverage system for reducing the force required to draw the bowstring and to hold it in a drawn position. A force distribution system includes a pair of cable-linked pulleys, one connected to each pair of cams, so that with rotation of one pulley in one direction there will be an equal and opposite rotation of the other pulley and pair of cams at the opposite end of the bow.
Inventors
- 👤 A Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:11
CPC Classifications
F; F41; F41B; F41B5/00; F41B5/10; F41B5/105; Y; Y10; Y10S; Y10S273/00; Y10S273/07
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
174 words
An archery bow comprising an elongate bow member having a centrally disposed handle section a pair of rigid limbs extending outward from said handle section presenting a first pair of spaced ends, a pair of flexible limbs extending outward from said handle section and presenting a second pair of spaced ends, one flexible limb of said pair of flexible limbs being laterally spaced from and extending along the side of one rigid limb and the other flexible limb of said pair being laterally spaced from and extending along the side of the other of said rigid limbs, leveraging means mounted on said bow member at each of said first pair of ends for reducing the force necessary to draw and to hold a bowstring in a fully drawn position, each of said means including first and second leveraging members, a bowstring disposed between said first pair of ends and interconnecting said first leveraging members, and flexible means disposed between and interconnecting each of said second pair of ends and an associated second leveraging member.
Claim 2
Dependent Claim
174 words
An archery bow comprising an elongate bow member having a centrally disposed handle section a pair of rigid limbs extending outward from said handle section presenting a first pair of spaced ends, a pair of flexible limbs extending outward from said handle section and presenting a second pair of spaced ends, one flexible limb of said pair of flexible limbs being laterally spaced from and extending along the side of one rigid limb and the other flexible limb of said pair being laterally spaced from and extending along the side of the other of said rigid limbs, leveraging means mounted on said bow member at each of said first pair of ends for reducing the force necessary to draw and to hold a bowstring in a fully drawn position, each of said means including first and second leveraging members, a bowstring disposed between said first pair of ends and interconnecting said first leveraging members, and flexible means disposed between and interconnecting each of said second pair of ends and an associated second leveraging member.
Claim 3
Dependent Claim
59 words
The bow of claim 1 further comprising coupling means linking said leveraging means at one of said first pair of ends with said leveraging means at the other of said first pair of ends and for providing upon angular displacement of either of said leveraging means, equiangular displacement in an opposite direction of the other of said leveraging means.
Claim 4
Dependent Claim
28 words
The archery bow of claim 2, wherein each said leveraging means comprises a pair of cam members having a common pivot axis and joined for simultaneous rotational movement.
Claim 5
Dependent Claim
24 words
The archery bow of claim 3, wherein said cam members include means for rotatably positioning each of said members with respect to the other.
Claim 6
Dependent Claim
139 words
An archery bow comprising a rigid limb assembly including a handle and a pair of substantially rigid limbs extending out from opposite ends of the handle presenting a pair of remote outer ends, means for powering said bow comprising a resilient member mounted on said assembly, a bowstring spanning said pair of remote outer ends, a pair of leveraging members mounted for rotation in one of said outer ends and coupled together for simultaneous movement in the same direction about a common pivot axis and through parallel planes, a means connecting said resilient member to one of said leveraging members whereby rotational movement of said one leveraging member is yieldably resisted by said resilient member, and means connecting the bowstring to the other leveraging member to cause the other leveraging member to rotate during the drawing of the bowstring.
Claim 7
Dependent Claim
139 words
An archery bow comprising a rigid limb assembly including a handle and a pair of substantially rigid limbs extending out from opposite ends of the handle presenting a pair of remote outer ends, means for powering said bow comprising a resilient member mounted on said assembly, a bowstring spanning said pair of remote outer ends, a pair of leveraging members mounted for rotation in one of said outer ends and coupled together for simultaneous movement in the same direction about a common pivot axis and through parallel planes, a means connecting said resilient member to one of said leveraging members whereby rotational movement of said one leveraging member is yieldably resisted by said resilient member, and means connecting the bowstring to the other leveraging member to cause the other leveraging member to rotate during the drawing of the bowstring.
Claim 8
Dependent Claim
57 words
The bow of claim 5, further including another pair of leveraging members mounted on the other of said outer ends, and a force distribution system coupled to said first-mentioned pair and said other pair of leveraging members said system including a pulley disposed at each of said outer ends, and means comprising a cable linking said pulleys.
Claim 9
Dependent Claim
28 words
The bow of claim 5, further comprising means for varying the relative rotational position of one leveraging member with respect to the other about said common pivot axis.
Claim 10
Dependent Claim
171 words
An archery bow comprising a rigid bow member including a handle and a pair of substantially rigid limbs joined to and extending out from opposite ends of the handle presenting a pair of remote outer ends, resilient means for powering said bow mounted on said member, a bowstring spanning said pair of outer ends, and means for connecting the extremities of the bowstring to said resilient means so that when the bowstring is drawn the resilient means will resist the draw of the bowstring, said means including a pair of cam plates mounted for rotation on movement of said bowstring on one of said outer ends and coupled together for simultaneous rotational movement in the same direction about a common pivot axis, one of said cam plates being connected to an extremity of said bowstring and having the bowstring trained thereover, said means further including a line connecting the other of said cam plates to said resilient means, whereby rotational movement of said plate is yieldably resisted by said resilient means.
Claim 11
Dependent Claim
171 words
An archery bow comprising a rigid bow member including a handle and a pair of substantially rigid limbs joined to and extending out from opposite ends of the handle presenting a pair of remote outer ends, resilient means for powering said bow mounted on said member, a bowstring spanning said pair of outer ends, and means for connecting the extremities of the bowstring to said resilient means so that when the bowstring is drawn the resilient means will resist the draw of the bowstring, said means including a pair of cam plates mounted for rotation on movement of said bowstring on one of said outer ends and coupled together for simultaneous rotational movement in the same direction about a common pivot axis, one of said cam plates being connected to an extremity of said bowstring and having the bowstring trained thereover, said means further including a line connecting the other of said cam plates to said resilient means, whereby rotational movement of said plate is yieldably resisted by said resilient means.
Claim 12
Dependent Claim
50 words
The bow of claim 8, wherein each of said pair of cam plates includes means for training said bowstring and said line, and said last mentioned means including a groove in each of said plates of each of said pair of plates for receiving, respectively, said bowstring and said line.
Claim 13
Dependent Claim
40 words
The bow of claim 8, further comprising a force distribution system coupled to each of said pair of cam plates, said system including a pulley disposed at each of said outer ends, and means comprising a cable linking said pulleys.
Claim 14
Dependent Claim
44 words
The bow of claim 10, wherein said handle and rigid limbs form a bow member having a bowed profile with said outer ends disposed rearwardly of said handle, and said bow member includes means defining a course along its profile accommodating said cable therein.
Claim 15
Dependent Claim
37 words
The bow of claim 8, further comprising means for varying the relative rotational position of one cam plate in each pair of said cam plates with respect to the other cam plate about said common pivot axis.
Claim 16
Dependent Claim
39 words
The bow of claim 8, wherein said resilient means comprises a flexible limb secured to said bow member adjacent the handle thereof and extending outwardly from said handle in a reach spaced laterally froM one of said rigid limbs.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |