US3575083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna wire launcher and bobbin projectile
Assignee: SRI International Inc
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Filing: 1968-12-09
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Granted: 1971-04-13
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Expires: 1988-12-09
Abstract
Abstract A small launcher and bobbin projectile is disclosed for draping a thin copper wire across the top of a tree for use as an antenna in emergency radio communications. The bobbin projectile comprises a suitable bobbin of wire with a nose cone. The bobbin is fitted on one end of a metal tube. The other end contains a cartridge of solid grain rocket fuel having a conventional bullet primer as an igniter. An inertia-type firing pin in the launcher is propelled by a hammer into the primer against the projectile mass. The rocket propelled projectile is spin stabilized by means of canted exhaust ports. The loose end of the wire is anchored on the ground, and the wire is payed out as the projectile ascends.
Inventors
- 👤 John A Hudick
- 👤 Robert A Rach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:06
CPC Classifications
F; F42; F42B; F42B12/00; F42B12/02; F42B12/36; F42B12/56; F42B12/68
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
144 words
A system for quickly laying out a small line over substantial distances or over tall objects, the combination comprising a bobbin projectile and projectile launcher, said launcher having means for securing thereto a free end of said line wound on said bobbin projectile, and said bobbin projectile comprising: a cylindrical shaft; a bobbin having a cylindrical body on which said line is wound, said bobbin being coaxially secured to one end of said shaft and said cylindrical body having a diameter greater than the diameter of said shaft; and a rocket fuel cartridge coaxially contained within and secured by said shaft at the end thereof remote from said bobbin, said cartridge having ports for exhausting combustion gases away from said one end of said shaft, whereby said shaft and bobbin are rocket propelled axially to pay out said line when said fuel is ignited.
Claim 2
Independent Claim
144 words
A system for quickly laying out a small line over substantial distances or over tall objects, the combination comprising a bobbin projectile and projectile launcher, said launcher having means for securing thereto a free end of said line wound on said bobbin projectile, and said bobbin projectile comprising: a cylindrical shaft; a bobbin having a cylindrical body on which said line is wound, said bobbin being coaxially secured to one end of said shaft and said cylindrical body having a diameter greater than the diameter of said shaft; and a rocket fuel cartridge coaxially contained within and secured by said shaft at the end thereof remote from said bobbin, said cartridge having ports for exhausting combustion gases away from said one end of said shaft, whereby said shaft and bobbin are rocket propelled axially to pay out said line when said fuel is ignited.
Claim 3
Dependent Claim
77 words
A system as defined in claim 1 wherein at least some of said ports are canted to impart spin to said shaft about its axis, and wherein said line is helically wound starting at the end of said bobbin remote from said cartridge and wound in a direction opposite the direction of said spin, whereby said line so wound on said bobbin is pulled off in a direction opposite to the direction of spin of said shaft.
Claim 4
Dependent Claim
43 words
A system as defined in claim 2 wherein said line is wound in layers, each layer starting at the end of said bobbin remote from said cartridge, whereby said line is payed out from each layer starting at the end nearest said cartridge.
Claim 5
Dependent Claim
23 words
A system as defined in claim 3 including substantially rectangular sheets of material wrapped between layers, one sheet between every two successive layers.
Claim 6
Dependent Claim
59 words
A system as defined in claim 3 including means for lightly securing in position the finish end of each layer, whereby as onE layer is pulled off by the flight of said bobbin as said shaft is propelled, the next layer will remain in position until the secured end is pulled free by pull of the payed out line.
Claim 7
Dependent Claim
23 words
A system as defined in claim 5 including substantially rectangular sheets of material wrapped between layers, one sheet between every two successive layers.
Claim 8
Dependent Claim
22 words
A system as defined in claim 6 wherein said line is a conductive wire for use as an antenna in radio communications.
Claim 9
Dependent Claim
121 words
A bobbin projectile for quickly laying out a small line over substantial distances or over tall objects from a given point at which one end of said line is secured comprising: a cylindrical shaft; a cylindrical bobbin having a diameter greater than the diameter of said shaft on which said line is wound, said bobbin being coaxially attached to one end of said shaft; and a rocket fuel cartridge coaxially inserted into and secured by the other end of said shaft remote from said bobbin, said cartridge having ports for exhausting combustion gases away from said one end of said shaft, whereby said shaft and bobbin are rocket propelled axially to pay out said line when said rocket cartridge is ignited.
Claim 10
Dependent Claim
121 words
A bobbin projectile for quickly laying out a small line over substantial distances or over tall objects from a given point at which one end of said line is secured comprising: a cylindrical shaft; a cylindrical bobbin having a diameter greater than the diameter of said shaft on which said line is wound, said bobbin being coaxially attached to one end of said shaft; and a rocket fuel cartridge coaxially inserted into and secured by the other end of said shaft remote from said bobbin, said cartridge having ports for exhausting combustion gases away from said one end of said shaft, whereby said shaft and bobbin are rocket propelled axially to pay out said line when said rocket cartridge is ignited.
Claim 11
Dependent Claim
78 words
A bobbin projectile as defined in claim 8 wherein at least some of said ports are canted to impart spin to said bobbin about its axis, and wherein said line is helically wound starting at the end of said bobbin remote from said cartridge and wound in a direction opposite the direction of said spin, whereby said line so wound on said bobbin is pulled off in a direction opposite to the direction of spin of said bobbin.
Claim 12
Dependent Claim
44 words
A bobbin projectile as defined in claim 9 wherein said line is wound in layers, each layer starting at the end of said bobbin remote from said cartridge, whereby said line is payed out from each layer starting at the end nearest said cartridge.
Claim 13
Dependent Claim
24 words
A bobbin projectile as defined in claim 10 including substantially rectangular sheets of material wrapped between layers, one sheet between every two successive layers.
Claim 14
Dependent Claim
59 words
A bobbin projectile as defined in claim 11 including means for lightly securing in position the finish end of each layer, whereby as one layer is pulled off by the flight of said bobbin as said shaft is propelled, the next layer will remain in position until the secured end is pulled free by pull of the payed-out line.
Claim 15
Dependent Claim
25 words
A bobbin projectile as defined in claim 12 including a substantially rectangular sheet of material wrapped between layers, one sheet between every two successive layers.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |