# US 9,004,111 B2 · Plug for connector

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- Number: US 9,004,111 B2
- Document ID: US9004111B2
- Status: Granted
- Kind: B2
- Application number: 14/342,117
- Filed: 2012-08-31
- Published: 2014-07-31
- Granted: 2015-04-14
- Earliest claimed: 2011-09-02
- Assignees: Nifco Inc.
- Applicants: Hiroyuki Nakaya
- Inventors: Hiroyuki Nakaya
- Web page: https://patentgrep.com/patent/US9004111B2

## CPC

- F16L 55/11: Plugs {(F16L55/128 takes precedence)}
- F16L 37/144: {the securing element being U-shaped}
- F16L 2201/80: Dust covers
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL

## Abstract

A plug for a connector includes an insertion portion, and the insertion portion includes an O-ring abutment portion and a creep prevention portion. Also, when the insertion portion of the plug for a connector is inserted in a mouth portion of a connector, the O-ring abutting portion abuts against an O-ring mounted inside the connector, and closes the mouth portion of the connector. Also, the creep prevention portion prevents a creep of a lock member which is in a standby position.

## Claims

### Claim 1

A plug for a connector, comprising:
an insertion portion adapted to be inserted in a mouth portion of a cylindrical connector including a lock mechanism moving between a standby position wherein a flange portion of a pipe can pass through, and a connected position wherein the flange portion of the pipe cannot pass through;
the insertion portion including an O-ring abutment portion formed in one end portion thereof and adapted to abut against an inner circumferential portion of an O-ring mounted inside the connector, the O-ring abutment portion including a hollow cylindrical shape having a concave portion with a circular shape in a cross section thereof; and a creep prevention portion for preventing a creep of the lock mechanism which is in the standby position, connected to the O-ring abutment portion and having an outer diameter smaller than that of the O-ring abutment portion for preventing interference with the lock mechanism; and
a grip portion connected to the creep prevention portion such that the creep prevention portion is arranged between the O-ring abutment portion and the grip portion, and having two circular plate portions at two end portions thereof with a diameter greater than that of the O-ring abutment portion and an intermediate portion extending between the two circular plate portions.

### Claim 2 (depends on 1)

A plug for a connector according to claim 1, wherein the creep prevention portion includes a notch portion forming a notch.

### Claim 3 (depends on 1)

A plug for a connector according to claim 1, wherein the creep prevention portion includes a thin shaft portion.

### Claim 4 (depends on 1)

A plug for a connector according to claim 1, wherein the creep prevention portion has a cross shape portion in a cross section thereof, and has the outer diameter smaller than those of the two circular plate portions.

### Claim 5 (depends on 4)

A plug for a connector according to claim 4, wherein the grip portion has a cross shape portion in a cross section thereof, and one of the two circular plate portions connecting the creep prevention portion has an outer diameter larger than that of the O-ring abutment portion and smaller than that of another of the two circular plate portions.