Patent US3878786A successfully refreshed from Google Patents.
US3878786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety detonator device for detonating fusecord
Assignee: EXPLO RIDGEWAY INTERNATIONAL L
•
Filing: 1973-12-27
•
Granted: 1975-04-22
•
Expires: 1993-12-27
Abstract
Abstract A detonator for detonating fusecord in which the initiating explosive charges are at one end of a closed elongated housing, the other end of the housing having an aperture closed by a movable valve element, for example a flap valve, which is displaceable to permit an end length of detonating cord to be inserted into contact with the initiating explosive charge and the housing is sufficiently strong to confine the explosion pressure in the event of premature detonation of the initiating explosive charge.
Inventors
- 👤 John Jerold Ridgeway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:15
CPC Classifications
C; C06; C06C; C06C5/00; C06C5/06; F; F42; F42B; F42B3/00; F42B3/10; F42B3/195; F42B39/00; F42B39/30; F42D; F42D1/00; F42D1/04; F42D1/043
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
141 words
A detonator device for initiating detonating fusecord comprising a closed elongated housing having at one end a charge of initiating explosive composition capable of initiating detonating fusecord and ignition means for igniting said charge, and having in its other end an aperture through which an end of a length of detonating cord may be inserted into position in the housing for initiation by the said explosive charge, said aperture being closed by an internally movable valve element which is arranged to be forced to a closed position by the force of said charge if accidentally detonated and which is displaceable from the aperture to permit an end length of detonating cord to be inserted into the housing, the closed housing being sufficiently strong to confine the explosion energy in the event of premature detonation of the said charge of initiating explosive.
Claim 2
Dependent Claim
141 words
A detonator device for initiating detonating fusecord comprising a closed elongated housing having at one end a charge of initiating explosive composition capable of initiating detonating fusecord and ignition means for igniting said charge, and having in its other end an aperture through which an end of a length of detonating cord may be inserted into position in the housing for initiation by the said explosive charge, said aperture being closed by an internally movable valve element which is arranged to be forced to a closed position by the force of said charge if accidentally detonated and which is displaceable from the aperture to permit an end length of detonating cord to be inserted into the housing, the closed housing being sufficiently strong to confine the explosion energy in the event of premature detonation of the said charge of initiating explosive.
Claim 3
Dependent Claim
141 words
A detonator device for initiating detonating fusecord comprising a closed elongated housing having at one end a charge of initiating explosive composition capable of initiating detonating fusecord and ignition means for igniting said charge, and having in its other end an aperture through which an end of a length of detonating cord may be inserted into position in the housing for initiation by the said explosive charge, said aperture being closed by an internally movable valve element which is arranged to be forced to a closed position by the force of said charge if accidentally detonated and which is displaceable from the aperture to permit an end length of detonating cord to be inserted into the housing, the closed housing being sufficiently strong to confine the explosion energy in the event of premature detonation of the said charge of initiating explosive.
Claim 4
Dependent Claim
141 words
A detonator device for initiating detonating fusecord comprising a closed elongated housing having at one end a charge of initiating explosive composition capable of initiating detonating fusecord and ignition means for igniting said charge, and having in its other end an aperture through which an end of a length of detonating cord may be inserted into position in the housing for initiation by the said explosive charge, said aperture being closed by an internally movable valve element which is arranged to be forced to a closed position by the force of said charge if accidentally detonated and which is displaceable from the aperture to permit an end length of detonating cord to be inserted into the housing, the closed housing being sufficiently strong to confine the explosion energy in the event of premature detonation of the said charge of initiating explosive.
Claim 5
Dependent Claim
41 words
A device as claimed in claim 1 wherein a plug defining an axial aperture is located in said other end of the housing and the valve element comprises a flap seated over said aperture on the inner face of said plug.
Claim 6
Dependent Claim
19 words
A device as claimed in claim 2 wherein the inner face of the plug is inclined to the axis.
Claim 7
Dependent Claim
15 words
A device as claimed in claim 2 wherein the flap is biassed towards said aperture.
Claim 8
Dependent Claim
14 words
A device as claimed in claim 4 wherein the biassing means comprises a spring
Claim 9
Dependent Claim
26 words
A device as claimed in claim 5 wherein the spring comprises a strip of material selected from the group consisting of phosphor-bronze, spring steel and beryllium-copper
Claim 10
Dependent Claim
26 words
A device as claimed in claim 2 wherein the flap is located with respect to the housing by means of a hinge of spring strip material.
Claim 11
Dependent Claim
24 words
A device as claimed in claim 2 wherein the flap is made from a member of the group consisting of metal and plastics materials.
Claim 12
Dependent Claim
28 words
A device as claimed in claim 8 wherein the flap is made from a plastics material selected from the group consisting of nylon, polyethylene, polypropylene and polyvinyl chloride.
Claim 13
Dependent Claim
27 words
A device as claimed in claim 2 wherein the flap is formed with a sharp edge arranged to resist withdrawal of the detonating fusecord from the housing.
Claim 14
Dependent Claim
17 words
A device as claimed in claim 1 wherein the charge of initiating explosive composition comprises lead azide.
References Cited (Backward Citations)
US3188914A
Cited
US3739724A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |