# US 2021/0278022 A1 · Connecting pipe

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- Number: US 2021/0278022 A1
- Document ID: US20210278022A1
- Status: Published application
- Kind: A1
- Application number: 17/330,849
- Filed: 2021-05-26
- Published: 2021-09-09
- Earliest claimed: 2018-12-11
- Assignees: Nitto Kohki Co., Ltd.
- Applicants: Nitto Kohki Co., Ltd.
- Inventors: Kazumasa Kaiya; Hiroshi Nishitsuji
- Web page: https://patentgrep.com/patent/US20210278022A1

## CPC

- F16L 27/0804: {the fluid passing axially from one joint element to another}
- F16L 41/021: {T- or cross-pieces (F16L41/025, F16L41/026, F16L41/028 take precedence)}
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL

## Abstract

A connecting pipe has a connecting pipe portion having, at the opposite ends thereof, connection opening end portions. The connecting pipe has a bendable portion provided between the opposite ends of the connecting pipe portion to allow the connecting pipe portion to be bent relative to the longitudinal axis of the connecting pipe portion. The connecting pipe further has rigid portions extending from the bendable portion to the connection opening end portions, respectively. The rigid portions have a higher rigidity than the bendable portion. Bending the connecting pipe portion at the bendable portion allows the connection opening end portions at the opposite ends to be fitted to associated pipe end portions, respectively. The connecting pipe portion has an elastic restoring force to maintain the state where the connection opening end portions are fitted to the associated pipe end openings, respectively.

## Claims

### Claim 1

A connecting pipe comprising a connecting pipe portion having, at opposite ends thereof, connection opening end portions to be connected by being fitted to two pipe end portions located at mutually spaced positions and having respective pipe openings, the connecting pipe comprising:
a bendable portion provided between the opposite ends of the connecting pipe portion to allow the connecting pipe portion to be bent relative to a longitudinal axis of the connecting pipe portion; and
rigid portions extending from the bendable portion to the connection opening end portions, respectively, the rigid portions having a higher rigidity than the bendable portion;
wherein bending the connecting pipe portion at the bendable portion allows the connection opening end portions at the opposite ends to be fitted to the pipe end portions respectively associated therewith, the bendable portion having an elastic restoring force to maintain a state where the connection opening end portions are fitted to the pipe end portions associated therewith after the state has been established.

### Claim 2 (depends on 1)

The connecting pipe of claim 1 further comprising: a branch pipe portion extending sideward from the connecting pipe portion between the opposite ends of the connecting pipe portion;
wherein the bendable portion is provided at a joint between the branch pipe portion and the connecting pipe portion.

### Claim 3 (depends on 2)

The connecting pipe of claim 2, wherein the bendable portion is formed by reducing a wall thickness of a corner between the connecting pipe portion and the branch pipe portion.

### Claim 4 (depends on 1)

The connecting pipe of claim 1 further comprising:
guide recesses provided in opposite end faces, respectively, of the connecting pipe portion to extend radially from an outer peripheral surface of the connecting pipe portion to an internal bore of the connecting pipe portion, the guide recesses allowing the pipe end portions to be guided from the outer peripheral surface toward the internal bore.

### Claim 5 (depends on 4)

The connecting pipe of claim 4, wherein the guide recesses extending to the internal bore have respective bottom surfaces inclined so as to come closer to the end faces of the connecting pipe portion, where the guide recesses are provided, as a distance increases from the outer peripheral surface toward the internal bore.

### Claim 6 (depends on 4)

The connecting pipe of claim 4, wherein the connecting pipe portion has thick-walled portions at the connection opening end portions, respectively, the thick-walled portions each having a thickened wall extending from the internal bore to the outer peripheral surface, the guide recesses being formed in the thick-walled portions, respectively.

### Claim 7 (depends on 6)

The connecting pipe of claim 6, wherein the thick-walled portions are each formed in a substantially annular shape, as a whole, along an outer periphery of the connecting pipe portion, the thick-walled portions each having a part thereof cut off by a plane parallel to the longitudinal axis of the connecting pipe portion to have flat surfaces, respectively, the guide recesses being formed to extend from respective substantially central portions of the flat surfaces to the internal bore.