US3756154A - Safety detonator - Google Patents
Safety detonator Download PDFInfo
- Publication number
- US3756154A US3756154A US00167694A US3756154DA US3756154A US 3756154 A US3756154 A US 3756154A US 00167694 A US00167694 A US 00167694A US 3756154D A US3756154D A US 3756154DA US 3756154 A US3756154 A US 3756154A
- Authority
- US
- United States
- Prior art keywords
- initiator
- firing
- blasting cap
- electric blasting
- detonator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000010304 firing Methods 0.000 claims abstract description 10
- 239000003999 initiator Substances 0.000 claims description 10
- 238000005422 blasting Methods 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 239000002360 explosive Substances 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims 1
- 230000005611 electricity Effects 0.000 abstract description 2
- 230000002028 premature Effects 0.000 abstract description 2
- 230000002265 prevention Effects 0.000 abstract description 2
- 230000003068 static effect Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B3/00—Blasting cartridges, i.e. case and explosive
- F42B3/10—Initiators therefor
- F42B3/18—Safety initiators resistant to premature firing by static electricity or stray currents
Definitions
- This invention relates to a detonator oriented towards the prevention of failure due to arcing or premature firing caused by ambient RF energy. (i.e., Radio, radar or microwave transmitters and static electricity.)
- ambient RF energy i.e., Radio, radar or microwave transmitters and static electricity.
- leadin wires (1) a firing initiator connected across the leadin wires (2) and an explosive change (3) adjacent to the firing initiator adapted to be ignited by said firing initiator, wherein said initiator is a thermistor.
Abstract
This invention relates to a detonator oriented towards the prevention of failure due to ''''arcing'''' or premature firing caused by ambient RF energy. (i.e., Radio, radar or microwave transmitters and static electricity.
Description
Sites atem [1 1 Snyder Sept. 4, 1973 SAFETY DETONATOR 3,211,096 lO/1965 Fomey et al l02/28 R [76] Inventor: Richard N. Snyder, 6505 Lignum St 3,421,440 H1969 Snyder I02/70.2 R
Springfield, Va. OTHER PUBLICATIONS [22] Filed; J l 30, 1971 Materials, Vol. 60, No. 5, Reinhold Publishing Corp.,
Appl. No.: 167,694
Mid-October, 1964, page 236 relied on Primary Examiner-Verlin R. Pendegrass Att0rneyRichard N. Snyder 5 7 ABSTRACT This invention relates to a detonator oriented towards the prevention of failure due to arcing or premature firing caused by ambient RF energy. (i.e., Radio, radar or microwave transmitters and static electricity.)
3 Claims, 1 Drawing Figure as follows:
1. In an electric blasting cap, leadin wires (1) a firing initiator connected across the leadin wires (2) and an explosive change (3) adjacent to the firing initiator adapted to be ignited by said firing initiator, wherein said initiator is a thermistor.
2. Within an electric blasting cap as set forth in claim 1 where there is further provided an insulating means disposed around the firing initiator.
3. In an electric blasting cap as set forth in claim 2 where the insulating means is a floun'de-carbon insula-
Claims (3)
1. In an electric blasting cap, leadin wires (1) a firing initiator connected across the leadin wires (2) and an explosive change (3) adjacent to the firing initiator adapted to be ignited by said firing initiator, wherein said initiator is a thermistor.
2. Within an electric blasting cap as set forth in claim 1 where there is further provided an insulating means disposed around the firing initiator.
3. In an electric blasting cap as set forth in claim 2 where the insulating means is a flouride-carbon insulation.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US16769471A | 1971-07-30 | 1971-07-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3756154A true US3756154A (en) | 1973-09-04 |
Family
ID=22608422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00167694A Expired - Lifetime US3756154A (en) | 1971-07-30 | 1971-07-30 | Safety detonator |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US3756154A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4206705A (en) * | 1978-06-19 | 1980-06-10 | The United States Of America As Represented By The Secretary Of The Army | Electric initiator containing polymeric sulfur nitride |
| US4261263A (en) * | 1979-06-18 | 1981-04-14 | Special Devices, Inc. | RF-insensitive squib |
| US4592280A (en) * | 1984-03-29 | 1986-06-03 | General Dynamics, Pomona Division | Filter/shield for electro-explosive devices |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3041972A (en) * | 1958-12-15 | 1962-07-03 | Atlas Chem Ind | Arc resistant electric initiator |
| US3181464A (en) * | 1961-06-21 | 1965-05-04 | Gen Precision Inc | Low conductance exploding bridge |
| US3196041A (en) * | 1960-11-25 | 1965-07-20 | Gen Lab Associates Inc | Method of making a semiconductor gap for an initiator |
| US3211096A (en) * | 1962-05-03 | 1965-10-12 | Texaco Experiment Inc | Initiator with a p-n peltier thermoelectric effect junction |
| US3421440A (en) * | 1967-04-11 | 1969-01-14 | Richard N Snyder | Electromagnetic attenuated detonating system |
-
1971
- 1971-07-30 US US00167694A patent/US3756154A/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3041972A (en) * | 1958-12-15 | 1962-07-03 | Atlas Chem Ind | Arc resistant electric initiator |
| US3196041A (en) * | 1960-11-25 | 1965-07-20 | Gen Lab Associates Inc | Method of making a semiconductor gap for an initiator |
| US3181464A (en) * | 1961-06-21 | 1965-05-04 | Gen Precision Inc | Low conductance exploding bridge |
| US3211096A (en) * | 1962-05-03 | 1965-10-12 | Texaco Experiment Inc | Initiator with a p-n peltier thermoelectric effect junction |
| US3421440A (en) * | 1967-04-11 | 1969-01-14 | Richard N Snyder | Electromagnetic attenuated detonating system |
Non-Patent Citations (1)
| Title |
|---|
| Materials, Vol. 60, No. 5, Reinhold Publishing Corp., Mid October, 1964, page 236 relied on * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4206705A (en) * | 1978-06-19 | 1980-06-10 | The United States Of America As Represented By The Secretary Of The Army | Electric initiator containing polymeric sulfur nitride |
| US4261263A (en) * | 1979-06-18 | 1981-04-14 | Special Devices, Inc. | RF-insensitive squib |
| US4592280A (en) * | 1984-03-29 | 1986-06-03 | General Dynamics, Pomona Division | Filter/shield for electro-explosive devices |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: SAFETY DEVICES, INC. LORTON, VA. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SNYDER, RICHARD N.;REEL/FRAME:004183/0061 Effective date: 19831012 |