US4617866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrotechnic or explosive device
Assignee: Haley and Weller Ltd
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Filing: 1984-05-16
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Granted: 1986-10-21
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Expires: 2004-05-16
Abstract
Abstract A pyrotechnic or explosive device comprises a pyrotechnic or explosive charge and an electrical firing circuit therefor. The firing circuit includes a source of electrical energy, an electrical firing element to ignite the charge, and an electric switch connected between the energy source and the firing element. The switch includes biasing means and manually engageable means for holding the switch open against the biasing means. Delay means, either pyrotechnic or electrical, are preferably included.
Inventors
- 👤 Geoffrey M. Simpson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:01
CPC Classifications
F; F42; F42C; F42C11/00; F42C11/06; F42C11/001; F42C11/003; F42C14/00; F42C14/02; F42C14/025; F42C9/00; F42C9/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
172 words
An explosive device including an outer casing containing an explosive charge, an electrical firing circuit and an electrical firing element connected to said electrical firing circuit and positioned to ignite said explosive charge, an electrical energy storage battery positioned within said outer casing, electrical switch means positioned within said outer casing for, in a first normal position, isolating said electrical energy storage battery from said electrical firing circuit and, in a second activated position, connecting said electrical energy storage battery to said electrical firing circuit, a manually engageable operating level for controlling the position of said electrical switch means, pin means for retaining said operating lever in a first position in which said electrical switch means is maintained in its first normal position, spring means for biasing said operating lever to move said operating lever to a second position on removal of said retaining pin means and manual release of said operating lever, in which second position the switch means is switched to its second activated position to fire said explosive charge.
Claim 2
Dependent Claim
172 words
An explosive device including an outer casing containing an explosive charge, an electrical firing circuit and an electrical firing element connected to said electrical firing circuit and positioned to ignite said explosive charge, an electrical energy storage battery positioned within said outer casing, electrical switch means positioned within said outer casing for, in a first normal position, isolating said electrical energy storage battery from said electrical firing circuit and, in a second activated position, connecting said electrical energy storage battery to said electrical firing circuit, a manually engageable operating level for controlling the position of said electrical switch means, pin means for retaining said operating lever in a first position in which said electrical switch means is maintained in its first normal position, spring means for biasing said operating lever to move said operating lever to a second position on removal of said retaining pin means and manual release of said operating lever, in which second position the switch means is switched to its second activated position to fire said explosive charge.
Claim 3
Dependent Claim
33 words
A device according to claim 1, in which the electrical firing circuit includes delay means for delaying ignition of the charge for a predetermined period of time after release of the operating lever.
Claim 4
Dependent Claim
25 words
A device according to claim 1, wherein the operating lever in its first position is arranged to lie adjacent to the surface of the device.
Claim 5
Dependent Claim
21 words
A device according to claim 1, wherein external connections are provided for connecting an external power supply to the firing element.
References Cited (Backward Citations)
FR1292384A
Cited
US3101055A
Cited
FR2015366A1
Cited
US3636878A
Cited
US3712218A
Cited
FR2116783A5
Cited
US4041865A
Cited
FR2339155A1
Cited
FR2483068A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-20 | 1990-04-21 | 1990-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-20 | 1994-04-21 | 1994-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-20 | 1998-04-21 | 1998-10-21 | $7700.00 | Window Closed / Lapsed |