JOINT UNIT

• US 20160348814A1
• Filed: 02/03/2015
• Published: 12/01/2016
• Est. Priority Date: 02/28/2014
• Status: Active Grant

• Current Assignee: Klaus Schmidt
• Original Assignee: Klaus Schmidt
• Inventors: NAGURA, Kenji, TAKAGI, Hitoshi
• Granted Patent: US 10,550,968 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F16L 19/0206 the collar not being integral with the pipe
• CPC Class Codes: F16L 19/0218 comprising only sealing rings
• CPC Class Codes: F16L 2201/30 Detecting leaks
• CPC Class Codes: Y10T 403/67 Thimble: screw or cam

Abstract

A joint unit includes a first joint member, a second joint member, and a gasket. The first joint member has a female screw portion. The second joint member has a second pipe portion and a second fastener. The second pipe portion has a male screw portion. The second fastener has a second fastener body and a second collar having an annular shape. The second fastener body has an external screw portion that is a male screw. The second collar has at an inner circumferential portion thereof an internal screw portion that is a female screw. The external screw portion is engaged with the female screw portion, and the male screw portion is engaged with the internal screw portion. In the joint unit, the second fastener body and the first joint member are fastened so that the second collar presses the second pipe portion toward the gasket.

Claims

1. A joint unit, comprising:

a first joint member having a first flow path and a screw portion provided at a part on an outer side than the first flow path;

a second joint member having a second flow path and screwed with the first joint member; and

a gasket arranged between the first joint member and the second joint member and having an opening that allows the first and second flow paths to communicate with each other,

the second joint member including;

a second pipe portion having the second flow path therein; and

a second fastener having a tubular shape and arranged on an outer side of the second pipe portion,

the second fastener including;

a second fastener body having an external thread portion engaged with the screw portion of the first joint member; and

a second collar having an annular shape and positioned closer to the first joint member than an end of the second fastener body positioned away from the first joint member,

the second collar including an inner circumferential portion having a contact portion in contact with an outer surface of the second pipe portion and another contact portion in contact with the second fastener body in an extending direction of the second pipe portion,

the second fastener body and the first joint member being fastened so that the second collar presses the second pipe portion toward the gasket.

2. The joint unit according to claim 1, wherein the second fastener body includes a holder that holds the second collar therein and presses the second collar toward the first joint member, and

a gap is formed between the holder and the second collar in a direction perpendicular to the extending direction of the second pipe portion.

3. The joint unit according to claim 1 or 2, wherein

the second pipe portion includes a male screw portion at an outer circumferential portion thereof,

the inner circumferential portion of the second collar includes an internal thread portion engaged with the male screw portion of the second pipe portion, and

the internal thread portion and the male screw portion are engaged so that the second collar presses the second pipe portion toward the gasket.

4. The joint unit according to claim 3, wherein

the external thread portion is a male screw, and

the external thread portion and the male screw portion of the second pipe portion are inversely threaded.

5. The joint unit according to claim 1, wherein at least one of the first joint member and the second joint member includes a connection path that connects a space between the second fastener and the first joint member to outside.

6. The joint unit according to claim 4, wherein

the first joint member includes:

a first pipe portion having the first flow path;

a first collar having an annular shape into which the first pipe portion is inserted; and

a first fastener body that covers the first collar, and

the first fastener body includes;

the screw portion engaged with the external thread portion; and

an abutment portion that extends inward and abuts against a part of the first collar positioned away from the second pipe portion.

7. The joint unit according to claim 6, wherein

the first pipe portion has another male screw portion that is inversely threaded with respect to the external thread portion at an end of the first pipe portion positioned on a side close to the second pipe portion, and

the first collar has a female screw portion engaged with the other male screw portion at an inner circumferential portion of the first collar.

8. The joint unit according to claim 6 or 7, wherein

the gasket includes a communication path forming portion that forms a communication path around the opening, the communication path allowing a first space between the gasket and the first collar and a second space between the gasket and the second collar to communicate with each other, and

at least one of the first joint member and the second joint member includes a connection path that connects the first and second spaces to outside.

9. The joint unit according to claim 1, wherein the first joint member has a position fixation portion that fixes a position of the gasket in a direction perpendicular to an extending direction of the first flow path.

10. A joint unit, comprising:

two joint members each having a flow path;

a tubular coupling portion that couples the two joint members; and

a gasket positioned between the two joint members and having an opening that allows the flow paths of the two joint members to communicate with each other,

the two joint members each including;

a pipe portion having the flow path therein; and

a tubular fastener arranged on an outer side of the pipe portion,

the fastener including;

a fastener body including an outer circumferential portion having a male screw portion; and

an annular collar positioned closer to the coupling portion than an end of the fastener body positioned away from the coupling portion,

the collar including an inner circumferential portion having a contact portion in contact with an outer surface of the pipe portion and another contact portion in contact with the fastener body in an extending direction of the pipe portion,

the male screw portions of the two joint members being inversely threaded with respect to each other,

the coupling portion including an inner circumferential portion having a first female screw portion engaged with the male screw portion of one of the two joint members and a second female screw portion engaged with the other male screw portion,

in each of the two joint members, the fastener body and the coupling portion being fastened so that the collar presses the pipe portion toward the gasket.

11. The joint unit according to claim 10, wherein

each fastener body includes a holder that holds the collar and presses the collar toward the fastener body of the other joint member, and

in each of the two joint members, a gap is formed between the holder and the collar in a direction perpendicular to the extending direction of the pipe portion.

12. The joint unit according to claim 11, wherein

each pipe portion has another male screw that is inversely threaded with respect to the male screw portion at an outer circumferential portion thereof, and

each collar has another female screw engaged with the another male screw.

13. The joint unit according to claim 10, wherein

the gasket includes a communication path forming portion that forms a communication path around the opening, the communication path allowing spaces between the gasket and the two joint members to communicate with each other, and

the coupling portion or at least one of the two joint members includes a connection path that connects the spaces to outside.