US3867885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical primer
Assignee: Dynamit Nobel AG
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Filing: 1973-09-12
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Granted: 1975-02-25
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Expires: 1993-09-12
Abstract
Abstract An electrical primer having a pole piece, a plated element having an ignition bridge, a casing member and an ignitable charge arranged within an electrically conductive housing such that the ignitable charge is in operative relation with the ignition bridge and an electrically conductive connection is provided between the pole piece and the housing via the plated element and the casing member. The pole piece is accessible from the outside of the housing and is provided with a recess in the side portion facing the ignitable charge and the plated element is arranged within the recess such that the bottom surface thereof rests on the bottom of the recess of the pole piece. The plated element may also have a peripheral surface portion resting against the wall portion of the recess.
Inventors
- 👤 Heinz Gawlick
- 👤 Hellmut Bendler
- 👤 Uwe Brede
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:50
CPC Classifications
F; F42; F42C; F42C19/00; F42C19/08; F42C19/12
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
156 words
An electrical primer comprising an electrically conductive housing, a pole piece disposed within said housing and accessible from outside of said housing, plated element means disposed within said housing and having an ignition bridge on one surface thereof, an inner casing means disposed within said housing, said plated element means and said inner casing means being arranged in said housing such that said pole piece is electrically conductively connected to said housing via said plated element means and said inner casing means, and at least one ignitable charge being disposed within said housing in operative relation with said ignition bridge for ignition thereby, said pole piece including cup-shaped recess means in the end portion thereof facing said at least one ignitable charge, said plated element means being arranged in said recess means such that at least a bottom surface of said plated element means rests on and is in electrically conductive contact with said pole piece.
Claim 2
Dependent Claim
156 words
An electrical primer comprising an electrically conductive housing, a pole piece disposed within said housing and accessible from outside of said housing, plated element means disposed within said housing and having an ignition bridge on one surface thereof, an inner casing means disposed within said housing, said plated element means and said inner casing means being arranged in said housing such that said pole piece is electrically conductively connected to said housing via said plated element means and said inner casing means, and at least one ignitable charge being disposed within said housing in operative relation with said ignition bridge for ignition thereby, said pole piece including cup-shaped recess means in the end portion thereof facing said at least one ignitable charge, said plated element means being arranged in said recess means such that at least a bottom surface of said plated element means rests on and is in electrically conductive contact with said pole piece.
Claim 3
Dependent Claim
26 words
An electrical primer according to claim 1, wherein said plated element means has a peripheral surface thereof resting against and in contact with said pole piece.
Claim 4
Dependent Claim
23 words
An electrical primer according to claim 1, wherein said recess means includes a bottom surface portion and a peripheral wall portion extending therefrom.
Claim 5
Dependent Claim
51 words
An electrical primer according to claim 3, wherein said plated element means includes first and second oppositely facing surface portions and a peripheral surface portion therebetween, said ignition bridge being provided on the first surface portion and the bottom surface of said plated element means being the second surface portion thereof.
Claim 6
Dependent Claim
26 words
An electrical primer according to claim 4, wherein said plated element means rests with the bottom surface thereof on the bottom portion of said recess means.
Claim 7
Dependent Claim
28 words
An electrical primer according to claim 5, wherein said plated element means rests with the peripheral surface portion thereof against the peripheral wall portion of said recess means.
Claim 8
Dependent Claim
21 words
An electrical primer according to claim 6, wherein the peripheral wall portion of said recess means is a cylindrical surface portion.
Claim 9
Dependent Claim
64 words
An electrical primer according to claim 5, further comprising an insulating member disposed within said housing and contacting said pole piece, said insulating member including a ring portion and a tubular portion extending from said ring portion into said recess means of said pole piece, said plated element means having the peripheral surface portion thereof resting against the tubular portion of said insulating member.
Claim 10
Dependent Claim
50 words
An electrical primer according to claim 8, wherein the wall portion of said recess means is conically tapered and the tubular portion of said insulating member has an outer peripheral surface thereof arranged for contact with the wall portion of said recess means and is conically tapered to cooperate therewith.
Claim 11
Dependent Claim
25 words
An electrical primer according to claim 9, wherein the wall portion of said recess means diverges inwardly toward the bottom portion of said recess means.
Claim 12
Dependent Claim
34 words
An electrical primer according to claim 10, wherein the tubular extension of said insulating member has an inner cylindrical surface portion arranged for cooperation with the peripheral surface portion of said plated element means.
Claim 13
Dependent Claim
78 words
An electrical primer according to claim 5, wherein said plated element means is arranged for contact with said inner casing means at the first surface portion thereof having said ignition bridge thereon, said ignition bridge including two electrodes, said inner casing means being provided with a bottom surface portion having a perforation extending therethrough, said bottom surface portion of said inner casing means establishing the electrically conductive connection with one of the two electrodes of said ignition bridge.
Claim 14
Dependent Claim
41 words
An electrical primer according to claim 12, wherein said inner casing means includes a tubular portion in contact with said housing and adjoining the bottom surface portion thereof, said at least one ignitable charge being disposed within said inner casing means.
Claim 15
Dependent Claim
39 words
An electrical primer according to claim 12, further comprising an electrically conductive annular contact disk means disposed within said housing and arranged between said plated eLement means and said inner casing means for establishing the electrically conductive connection therebetween.
Claim 16
Dependent Claim
47 words
An electrical primer according to claim 14, wherein said annular contact disk means is provided with a slight conical shape prior to being disposed in said housing and is disposed in said housing with the inner rim thereof facing in the direction of said plated element means.
Claim 17
Dependent Claim
42 words
An electrical primer according to claim 15, wherein said inner casing means includes a tubular wall portion adjoining the bottom portion thereof, said tubular wall portion having a wall thickness which decreases in the direction facing away from said plated element means.
Claim 18
Dependent Claim
53 words
An electrical primer according to claim 5, further comprising sealing means covering the at least one ignitable charge disposed within said housing, and marking means provided on said sealing means for indicating the flawless conducting of the pressing operation for the pressure introduction of the at least one ignitable charge within said housing.
Claim 19
Dependent Claim
24 words
An electrical primer according to claim 17, wherein said at least one charge is disposed within said inner casing means arranged within said housing.
Claim 20
Dependent Claim
17 words
An electrical primer according to claim 5, wherein a plurality of charges are disposed within said housing.
Claim 21
Dependent Claim
53 words
An electrical primer according to claim 16, further comprisng sealing means covering the at least one ignitable charge disposed within said housing, and marking means provided on said sealing means for indicating the flawless conducting of the pressing operation for the pressure introduction of the at least one ignitable charge within said housing.
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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |