Method of producing a rotationally oriented thread
US-2016303672-A1 · Oct 20, 2016 · US
Spark plug
US9166376B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9166376-B2 |
| Application number | US-201314016845-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 3, 2013 |
| Priority date | Sep 11, 2012 |
| Publication date | Oct 20, 2015 |
| Grant date | Oct 20, 2015 |
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Abstract
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A spark plug includes a tubular insulator and a tubular metal shell secured to an outer peripheral surface of the insulator by crimping. The tubular metal shell includes: an inner peripheral surface where powder for sealing is filled between the outer peripheral surface and the inner peripheral surface; a tool engagement portion overhanging in a polygonal shape; and a crimped lid disposed at an end portion of the metal shell coupled to the tool engagement portion, the end portion being bent toward the outer peripheral surface of the insulator by crimping. A relationship between a length L and a thickness t satisfies 2.50≦L/t≦3.10, the length L being a length along a shape of the crimped lid from the tool engagement portion to the insulator in a planar surface that passes through the axis, the thickness t being a thickness at an intermediate portion of the crimped lid.
First claim
Opening claim text (preview).
What is claimed is: 1. A spark plug comprising: a tubular insulator extending along and centered on an axis; and a tubular metal shell secured to an outer peripheral surface of the insulator by crimping, the tubular metal shell including an inner peripheral surface and being filled up with powder for sealing between the outer peripheral surface of the insulator and the inner peripheral surface, wherein the metal shell includes a tool engagement portion and a crimped lid, the t…
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Frequently asked questions
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- What does patent US9166376B2 cover?
- A spark plug includes a tubular insulator and a tubular metal shell secured to an outer peripheral surface of the insulator by crimping. The tubular metal shell includes: an inner peripheral surface where powder for sealing is filled between the outer peripheral surface and the inner peripheral surface; a tool engagement portion overhanging in a polygonal shape; and a crimped lid disposed at an…
- Who is the assignee on this patent?
- Ngk Spark Plug Co
- What technology area does this patent fall under?
- Primary CPC classification H01T13/08. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Oct 20 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).