US4020819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable force bow
Assignee: Individual
•
Filing: 1975-11-24
•
Granted: 1977-05-03
•
Expires: 1995-11-24
Abstract
Abstract A bow having a variable tension bowstring including one or more movable connecting points for the bowstring which points travel along the bow limbs from more central positions toward the limb tips as the bowstring is drawn, whereby the "drawing force," required to draw the bowstring to a fully extended position, gradually increases to a peak and then decreases and stabilizes so that the drawing force required to maintain the bowstring fully drawn is much less than the force at its peak. A pair of rollers are coupled to the bowstring and mounted for movement along the bow limbs. The rollers are connected by a member for keeping the distance between the rollers constant while the rollers ride along the limbs as a bowstring is drawn.
Inventors
- 👤 James Ronald Haines
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:13
CPC Classifications
F; F41; F41B; F41B5/00; F41B5/0073; F41B5/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
149 words
An archery bow for shooting arrows comprising: a handle section by which the archer holds said bow during aiming and shooting; a pair of elongated limbs each extending longitudinally away from said handle section; a pair of spaced limb tips located at the ends of said limbs farthest from said handle section; a bowstring associated with said tips in force exerting relationship to said limbs; a pair of rollers coupled to said bowstring and mounted for movement along said limbs; a pair of roller frames one carried on one of said rollers and straddling one of said limbs and the other carried on the other of said rollers and straddling the other of said limbs and said rollers having means connected to said bow limbs to permit rolling by said rollers along said bow limbs substantially the full length of said bow limbs during the drawing of said bowstring.
Claim 2
Dependent Claim
149 words
An archery bow for shooting arrows comprising: a handle section by which the archer holds said bow during aiming and shooting; a pair of elongated limbs each extending longitudinally away from said handle section; a pair of spaced limb tips located at the ends of said limbs farthest from said handle section; a bowstring associated with said tips in force exerting relationship to said limbs; a pair of rollers coupled to said bowstring and mounted for movement along said limbs; a pair of roller frames one carried on one of said rollers and straddling one of said limbs and the other carried on the other of said rollers and straddling the other of said limbs and said rollers having means connected to said bow limbs to permit rolling by said rollers along said bow limbs substantially the full length of said bow limbs during the drawing of said bowstring.
Claim 3
Dependent Claim
63 words
The archery bow of claim 1 wherein said interconnecting means between said frames includes an inextensible cable of a predetermined length and said bow limbs are curved relative to said handle section forming an arcuate shape defined by said handle section, said limbs and said limb tips and said cable being disposed in a chordal position across said bow between said roller frames.
Claim 4
Dependent Claim
21 words
The archery bow of claim 2 wherein said bowstring is affixed to said limb tips and is connected to said frames.
Claim 5
Dependent Claim
46 words
The archery bow of claim 1 wherein said interconnecting means include a pair of legs mounted between said limbs and said handle section and extending toward said bowstring, each of said legs carrying a connecting member which extends to the couples with one of said frames.
Claim 6
Dependent Claim
31 words
The archery bow of claim 4 wherein each of said limb tips includes a pulley and said bowstring is interposed between said frames and carried in operative relationship to said pulleys.
Claim 7
Dependent Claim
61 words
The archery bow of claim 5 wherein said bow includes a front surface facing the direction in which the arrow is shot and a rear surface facing the direction of said bowstring and said rear surface being concave said rollers engaging said front surface for movement thereacross as said bowstring is drawn from a rest position to a drawn limb-flexed position.
References Cited (Backward Citations)
US1885962A
Cited
US3812835A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |