US4983877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition plug for use in internal combustion engines to cause instantaneous combustion
Assignee: Individual
•
Filing: 1989-04-04
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Granted: 1991-01-08
•
Expires: 2009-04-04
Abstract
Abstract Disclosed are two types of ignition plugs for use in internal combustion engines of automobiles and the like, which are essentially characterized by the addition of ignition means to conventionally paired center and ground electrodes, and their location to the latters; that is, both the ignition plugs are designed to ignite gas mixture in the whole space of combustion chamber by firstly igniting gas mixture in an ignition groove on the ignition means; for this, the opening of the groove is located in such a place as to receive first ignition seeds appearing in a spark gap between center and ground electrodes as effectively as possible.
Inventors
- 👤 Ryohei Kashiwara
- 👤 Hideaki Kashiwara
- 👤 Hidehiko Noguchi
- 👤 Takeaki Kashiwara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:36
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/46; H01T13/467; H01T13/20; H01T13/32
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
203 words
An ignition plug for use in an internal combustion engine comprising a metal casing, a cylindrical high tension center electrode axially disposed in the metal casing, a ground electrode extending from the casing, said ground electrode having a substantially L-shape with a first leg extending substantially axially from the metal casing and a second leg having a free end extending radially inward and axially spaced from a terminal end of the center electrode to define a spark gap, said second leg having a length and width greater than a diameter of the center electrode; a plurality of substantially L-shaped ignition means having a first leg extending axially from the metal casing and a second leg extending radially inward toward said center electrode and having a free end radially spaced from the center electrode, wherein said ignition means is provided with an ignition groove on an outer surface opposite the center electrode and said ignition groove defining an axis directed toward the spark gap, and wherein the spaces between the free end of the ignition means and the center electrode are equal and wherein each space between the free end of the ignition means and the center electrode is greater than the spark gap.
Claim 2
Dependent Claim
203 words
An ignition plug for use in an internal combustion engine comprising a metal casing, a cylindrical high tension center electrode axially disposed in the metal casing, a ground electrode extending from the casing, said ground electrode having a substantially L-shape with a first leg extending substantially axially from the metal casing and a second leg having a free end extending radially inward and axially spaced from a terminal end of the center electrode to define a spark gap, said second leg having a length and width greater than a diameter of the center electrode; a plurality of substantially L-shaped ignition means having a first leg extending axially from the metal casing and a second leg extending radially inward toward said center electrode and having a free end radially spaced from the center electrode, wherein said ignition means is provided with an ignition groove on an outer surface opposite the center electrode and said ignition groove defining an axis directed toward the spark gap, and wherein the spaces between the free end of the ignition means and the center electrode are equal and wherein each space between the free end of the ignition means and the center electrode is greater than the spark gap.
Claim 3
Dependent Claim
21 words
The ignition plug of claim 1 wherein the ignition means further includes a chamfered outer edge cooperating with the ignition groove.
Claim 4
Dependent Claim
22 words
The ignition plug of claim 1 wherein the ground electrode has a chamfered edge facing an ignition groove of the ignition means.
Claim 5
Dependent Claim
16 words
The ignition plug of claim 1 wherein the ignition means has a substantially V-shaped cross section.
Claim 6
Dependent Claim
15 words
The ignition plug of claim 1 wherein the ignition means has a substantially semi-circular cross-section.
Claim 7
Dependent Claim
20 words
The ignition plug of claim 1 wherein the ignition means has a substantially square cross-section and a frustum-shaped ignition groove.
Claim 8
Dependent Claim
20 words
The ignition plug of claim 1 wherein the ignition means has a substantially square cross-section and a V-shaped ignition groove.
Claim 9
Dependent Claim
21 words
The ignition plug of claim 1 wherein the ignition means has a substantially square cross-section and a semi-circular shaped ignition groove.
Claim 10
Dependent Claim
17 words
The ignition plug of claim 3 wherein the free end of the ground electrode is semi-circular shaped.
Claim 11
Dependent Claim
31 words
The ignition plug of claim 1 wherein the free end of the ground electrode has a substantially hollow trumpet-shaped cross section having an open end directed away from the center electrode.
Claim 12
Dependent Claim
136 words
An ignition plug for use in an internal combustion engine comprising; (a) a metal casing; (b) A cylindrical high tension center electrode disposed axially in the metal casing; (c) an L-shaped ground electrode having a first leg extending axially from the metal casing and a second leg extending radially inward at a right angle to an axis of the center electrode and axially spaced from a terminal end of the center electrode; (d) an ignition means disposed on the end of the center electrode to define a substantially T-shape, said ignition means having a longitudinal ignition groove facing the ground electrode and wherein the ignition means has a longitudinal axis perpendicular to a longitudinal axis of the second leg of the ground electrode and defines a spark gap between the ignition means and the ground electrode.
Claim 13
Dependent Claim
136 words
An ignition plug for use in an internal combustion engine comprising; (a) a metal casing; (b) A cylindrical high tension center electrode disposed axially in the metal casing; (c) an L-shaped ground electrode having a first leg extending axially from the metal casing and a second leg extending radially inward at a right angle to an axis of the center electrode and axially spaced from a terminal end of the center electrode; (d) an ignition means disposed on the end of the center electrode to define a substantially T-shape, said ignition means having a longitudinal ignition groove facing the ground electrode and wherein the ignition means has a longitudinal axis perpendicular to a longitudinal axis of the second leg of the ground electrode and defines a spark gap between the ignition means and the ground electrode.
Claim 14
Dependent Claim
18 words
The ignition plug of claim 11 wherein the ground electrode has chamfered edges cooperating with the ignition means.
Claim 15
Dependent Claim
28 words
The ignition plug of claim 12 wherein the ignition means has a transverse recess having a frustum shape corresponding essentially to the cross-section shape of the ground electrode.
Claim 16
Dependent Claim
34 words
The ignition plug of claim 11 wherein the ground electrode has a substantially triangular cross-section with a rounded apex and wherein the ignition means has a semi-circular transverse recess cooperating with the ground electrode.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-07 | 1994-07-09 | 1995-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-07 | 1998-07-09 | 1999-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-07 | 2002-07-09 | 2003-01-08 | $7700.00 | Window Closed / Lapsed |