Patent US4449939A successfully refreshed from Google Patents.
US4449939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safe-arm training simulator
Assignee: United States Department of the Navy
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Filing: 1983-06-08
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Granted: 1984-05-22
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Expires: 2003-06-08
Abstract
Abstract A safe-arm simulator device for use in training personnel in maintaining operating a missile rocket motor fuze safe-arm device of the type presently utilized on live missiles is disclosed. The device comprises a spring mounted on a rotatable shaft contained within a cylindrical housing. The housing is inserted in a bored hole of a dummy missile, exposing a key slot in the base of the shaft. A key is mounted on the device for turning the device from a safe to arm position. The spring offers resistance to turning similarly incurred in a live safe-arm device and likewise returns and maintains the device in a safe orientation unless locked in the arm position.
Inventors
- 👤 William R. Matteson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:22
CPC Classifications
F; F42; F42B; F42B8/00; F42B8/12; F42B8/24; F41; F41A; F41A33/00
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
162 words
A two-position, self-locking, safe-arm training device, comprising: a baseplate having at least one hole through said baseplate; a shaft mounted through said hole in said baseplate and having first and second holes in said shaft; a spring mounted around said shaft and anchored at one end of said spring to said first hole in said shaft; a housing mounted around said spring for keeping said spring under tension and for anchoring the other end of said spring, and having at least one roll slot in said housing; a roll pin mounted in said second hole in said shaft and extending through said roll slot of said housing for confining said shaft in said housing, and for allowing said shaft to be switched between two set 90° positions, one of which corresponds to a safe position, and the other of which corresponds to an arm position, such that said spring returns said shaft to said safe position unless locked in said arm position.
Claim 2
Dependent Claim
162 words
A two-position, self-locking, safe-arm training device, comprising: a baseplate having at least one hole through said baseplate; a shaft mounted through said hole in said baseplate and having first and second holes in said shaft; a spring mounted around said shaft and anchored at one end of said spring to said first hole in said shaft; a housing mounted around said spring for keeping said spring under tension and for anchoring the other end of said spring, and having at least one roll slot in said housing; a roll pin mounted in said second hole in said shaft and extending through said roll slot of said housing for confining said shaft in said housing, and for allowing said shaft to be switched between two set 90° positions, one of which corresponds to a safe position, and the other of which corresponds to an arm position, such that said spring returns said shaft to said safe position unless locked in said arm position.
Claim 3
Dependent Claim
121 words
In combination with a training missile and a safe-arm key, a mechanism to be used as a training device simulating a tactical safe-arm rocket motor fuze mechanism, including: a baseplate mounted to said training missile; a rotatable shaft mounted through said baseplate; a housing extending from said baseplate and substantially enclosing said shaft; a spring having first and second ends, mounted around said shaft and within said housing, said spring being anchored at said first end to said shaft and anchored at said second end to said housing; means contained within said housing for confining rotation of said shaft within a 90° parameter; and means attached to said shaft for permitting insertion of said safe-arm key for rotation of said shaft.
Claim 4
Dependent Claim
121 words
In combination with a training missile and a safe-arm key, a mechanism to be used as a training device simulating a tactical safe-arm rocket motor fuze mechanism, including: a baseplate mounted to said training missile; a rotatable shaft mounted through said baseplate; a housing extending from said baseplate and substantially enclosing said shaft; a spring having first and second ends, mounted around said shaft and within said housing, said spring being anchored at said first end to said shaft and anchored at said second end to said housing; means contained within said housing for confining rotation of said shaft within a 90° parameter; and means attached to said shaft for permitting insertion of said safe-arm key for rotation of said shaft.
Claim 5
Dependent Claim
22 words
The combination of claim 2, wherein said baseplate comprises a rectangular slab of machined stainless steel, having first and second broad surfaces.
Claim 6
Dependent Claim
25 words
The combination of claim 3, wherein said rectangular slab has a curved contour on a first broad surface for one-way mating with said safe-arm key.
Claim 7
Dependent Claim
24 words
The combination of claim 3, wherein said rectangular slab has a planar contour on a second broad surface for proper mating with said missile.
Claim 8
Dependent Claim
23 words
The combination of claim 3, wherein said rectangular slab has a centrally positioned hole for insertion therein and bonding thereto of said housing.
Claim 9
Dependent Claim
21 words
The combination of claim 3, wherein said rectangular slab has means for removably but firmly affixing said baseplate to said missile.
Claim 10
Dependent Claim
31 words
The combination of claim 7 wherein said affixing means comprises two bolt holes through said baseplate, one on either side of said centrally positioned hole, for insertion therethrough of two bolts.
Claim 11
Dependent Claim
23 words
The combination of claim 3, wherein said rectangular slab has two rounded corners and two square corners for one-way mating with said missile.
Claim 12
Dependent Claim
16 words
The combination of claim 2, wherein said rotatable shaft comprises a solid, machined stainless steel cylinder.
Claim 13
Dependent Claim
41 words
The combination of claim 10 wherein said steel cylinder comprises a first and a second part, said first part being of a diameter smaller than said second part and said second part having a recessed base with a slot extending therefrom.
Claim 14
Dependent Claim
18 words
The combination of claim 11 wherein said spring is coiled around said first part of said rotatable shaft.
Claim 15
Dependent Claim
41 words
The combination of claim 2, wherein said housing comprises a machined stainless steel, hollow cylinder having a circular hole at a first end and being open at a second end and having a diameter large enough to contain said rotatable shaft.
Claim 16
Dependent Claim
40 words
The combination of claim 13 wherein said first part of said shaft passes through said circular hole in said first end of said housing and said second part of said shaft passes through said open second end of said housing.
Claim 17
Dependent Claim
27 words
The combination of claim 13 wherein said housing is provided with a first and a second window in a 90° arc of the circumference of said housing.
Claim 18
Dependent Claim
32 words
The combination of claim 15, wherein said rotation confining means comprises a pin attached to said second part of said rotatable shaft and extending through said first 90° window of said housing.
Claim 19
Dependent Claim
59 words
The combination of claim 15 wherein said key insertion means comprises said recessed base and slot of said rotatable shaft juxtaposed said second window of said housing in such manner that said safe-arm key may be inserted therein and turned 90° from a safe position, maintained by said spring, to an arm position under torsional resistance of said spring.
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) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |