CORROSION RESISTANT ROLLER CHAIN

• US 20070254760A1
• Filed: 04/12/2007
• Published: 11/01/2007
• Est. Priority Date: 04/27/2006
• Status: Abandoned Application

• Current Assignee: Keisuke Murakami, Kunito Kobayashi
• Original Assignee: Keisuke Murakami, Kunito Kobayashi
• Inventors: Kobayashi, Kunito, Murakami, Keisuke
• Application Number:
  US11/734,305
• Publication Number:
  US 20070254760A1
• Time in Patent Office: Days
• US Class Current: 474/231
• CPC Class Codes: F16G 13/06 with links connected by parallel driving-pins with or without rollers so called open links if the parallel coupling pins have only a joining function - so called closed links - F16G13/02

Abstract

A corrosion resistant roller chain which exhibits protection against corrosion for a long period of time under corrosive conditions such as saltwater, acid, alkali or the like comprises outer plates 110 and inner plates 130 which comprise a zinc-aluminum system alloy coating which is thinner than required by JIS and a chemical conversion coating which covers the zinc-aluminum system alloy coating.

Claims

1. A corrosion resistant roller chain comprising a pair of right and left inner plates, a bush press-fitted between said inner plates, a roller loosely fitted on said bush, a pair of right and left outer plates disposed on both outer sides of said inner plates, and a connecting pin loosely penetrated through said bush and press-fitted between said outer plates,

wherein said outer plates and said inner plates comprise a zinc-aluminum system alloy coating which is thinner than is required by Japanese Industrial Standard (JIS), and

wherein said outer plates and said inner plates comprise a chemical conversion coating which covers said zinc-aluminum system alloy coating.

2. The corrosion resistant roller chain according to claim 1, wherein said bush and said connecting pin comprise a nickel coating.

3. The corrosion resistant roller chain according to claim 1, wherein said roller comprises a zinc-aluminum system alloy coating which is thinner than required by JIS, and wherein said roller comprises a chemical conversion coating which covers said zinc-aluminum system alloy coating.

4. The corrosion resistant roller chain according to claim 1, wherein said roller comprises a nickel coating.

5. The corrosion resistant roller chain according to claim 1, wherein said zinc-aluminum system alloy coating is about 10 to about 40 μ

m thick.

6. The corrosion resistant roller chain according to claim 1, wherein said chemical conversion coating is about 5 μ

m thick or less.

7. The corrosion resistant roller chain according to claim 2, wherein said nickel coating is about 10 to about 15 μ

m thick.

8. The corrosion resistant roller chain according to claim 1, wherein said conversion coating uninterruptedly covers the zinc-aluminum system alloy coating.