Patent US4051339A successfully refreshed from Google Patents.
US4051339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable time missile safety timer
Assignee: United States Department of the Navy
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Filing: 1964-12-28
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Granted: 1977-09-27
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Expires: 1984-12-28
Abstract
Abstract 1. A variable delay arming timer comprising A cylindrical housing, A motor and gearing contained within said housing, A shaft coupled to said gearing to be rotated thereby at a predetermined e, said shaft being coaxial with said cylindrical housing, Cam means mounted on said shaft for rotation therewith, Snap-action switch means carried by said housing and controlled by said cam means, said snap-action switch means having at least one spring biased actuating rod controlled between a retracted switch open position to an advanced switch-closed position by means of said cams, said rod being carried by said housing and being arranged in parallel relationship to said shaft and radially displaced from said shaft by a distance greater than the radius of said cylindrical housing, and Switch carrying discs surrounding said cylindrical housing in coaxial relation thereto, said discs carrying switch elements in position to be actuated by said actuating rods.
Inventors
- 👤 Albert S. Will
- 👤 Robert R. Wilson
- 👤 Paul L. Culver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:52
CPC Classifications
H; H01; H01H; H01H43/00; H01H43/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
149 words
A variable delay arming timer comprising a cylindrical housing, a motor and gearing contained within said housing, a shaft coupled to said gearing to be rotated thereby at a predetermined rate, said shaft being coaxial with said cylindrical housing, cam means mounted on said shaft for rotation therewith, snap-action switch means carried by said housing and controlled by said cam means, said snap-action switch means having at least one spring biased actuating rod controlled between a retracted switch open position to an advanced switch-closed position by means of said cams, said rod being carried by said housing and being arranged in parallel relationship to said shaft and radially displaced from said shaft by a distance greater than the radius of said cylindrical housing, and switch carrying discs surrounding said cylindrical housing in coaxial relation thereto, said discs carrying switch elements in position to be actuated by said actuating rods.
Claim 2
Dependent Claim
149 words
A variable delay arming timer comprising a cylindrical housing, a motor and gearing contained within said housing, a shaft coupled to said gearing to be rotated thereby at a predetermined rate, said shaft being coaxial with said cylindrical housing, cam means mounted on said shaft for rotation therewith, snap-action switch means carried by said housing and controlled by said cam means, said snap-action switch means having at least one spring biased actuating rod controlled between a retracted switch open position to an advanced switch-closed position by means of said cams, said rod being carried by said housing and being arranged in parallel relationship to said shaft and radially displaced from said shaft by a distance greater than the radius of said cylindrical housing, and switch carrying discs surrounding said cylindrical housing in coaxial relation thereto, said discs carrying switch elements in position to be actuated by said actuating rods.
Claim 3
Dependent Claim
83 words
A variable delay arming timer as recited in claim 1, wherein said actuating rod is at least partially constructed of an electrically insulating material and has a shorting bar extending transversely therethrough, said switch elements comprising a pair of contacts disposed on diametrically opposite sides of said actuating rod, said contacts each having opposed spring fingers thereon between which said shorting bar is pressed when said actuating rod is advanced to the switch-closed position, whereby a conductive path is established between said contacts.
Claim 4
Dependent Claim
203 words
A variable delay arming timer as recited in claim 1 wherein said cam means comprises at least one cylindrical cam disc fixed on said shaft and coaxial therewith, said cam disc having a plane surface thereon normal to the axis of said shaft, a drop-in slot extending a predetermined distance along the periphery of said cam disc from said plane surface in a direction parallel to the axis of said shaft and resetting ramp coupling the end of said drop-in slot back to said plane surface, said actuating rod having a cam follower thereon, said follower comprising a pin extending transversely from said actuating rod and lying adjacent said plane surface to define the switch open position, the length of said drop-in slot being the distance of travel of said actuating rod from the switch open to the switch closed position, whereby said actuating rod is retained in the switch open position when said cam follower lies adjacent said plane surface under the action of said spring, is moved to the switch-closed position when said follower enters said drop-in slot after said predetermined time delay and is returned to the switch open position upon further rotation of said cam by said resetting ramp.
Claim 5
Dependent Claim
127 words
A timer as defined in claim 3, wherein means are provided for eliminating wear on said cam follower during setting operations of said timer, said means comprising a reduced diameter portion on said switch actuating rod defining a shoulder thereon, said shoulder being located adjacent the periphery of said cam disc when said actuating rod is in the switch open position, a ball confined in said housing and cooperable with said shoulder to raise said cam follower off said plane surface when biased toward said actuating rod, and cam means on said cam disc for pressing said ball toward said actuating rod and for allowing said ball to move away from said actuating rod when said drop-in slot and said resetting ramp are adjacent said actuating rod.
Claim 6
Dependent Claim
88 words
A timer as defined in claim 3, wherein a leaf spring is secured to said cam disc in overlying relation to said drop-in slot and said resetting ramp, said leaf spring in its unflexed condition being depressed into the resetting ramp and raised above said drop-in slot, whereby when said cam disc is rotated inadvertently in the reverse of its normal direction past said actuating rod, said cam follower is prevented from entering said resetting ramp and said drop-in slot and is carried thereover by said leaf 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) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |