Torque limiting fluid connector system

• US 9,303,800 B2
• Filed: 06/13/2011
• Issued: 04/05/2016
• Est. Priority Date: 11/12/2010
• Status: Active Grant

• Current Assignee: Fluidmaster Incorporated
• Original Assignee: Fluidmaster Incorporated
• Inventors: Collin, Robert, Carruthers, Dale, McGrath, Patrick
• Primary Examiner(s): HEWITT, JAMES M
• Application Number:
  US13/159,377
• Publication Number:
  US 20120117784A1
• Time in Patent Office: 1,758 Days
• Field of Search: 285/247, 285/248, 285/249, 285/92, 285/330, 285/354, 285/386, 285/387, 285/389
• US Class Current: 1/1
• CPC Class Codes: F16L 19/0206 the collar not being integral with the pipe
• CPC Class Codes: F16L 33/2076 by plastic deformation
• CPC Class Codes: Y10T 29/49948 Multipart cooperating fastener [e.g., bolt and nut]

Abstract

A torque limiting fluid connector system which can be hand screwed to a maximum tightening torque and be hand loosened, including: an outer member having a front opening, a back opening, and a plurality of outwardly flexible portions separated by axially extending slots; an inner member having a front opening, a back opening, an interior threaded surface and a plurality of outwardly extending projections dimensioned to be received within the axially extending slots when the inner member is received within the outer member; a connector having one end received within the inner member and an opposite end extending out of the back end of the inner member; and a washer mounted onto the end of the connector that is received within the inner member.

Claims

1. A torque limiting fluid connector system, comprising:

an outer member having an external surface, an internal surface, a front opening dimensioned to receive an inner member within the internal surface, a back opening, and a plurality of outwardly flexible portions extending outwardly radially, each portion extending circumferentially part-way around the inner member and separated by axially extending slits between the external and internal surfaces;

the inner member insertable into the internal surface of the outer member and having a front opening, a back opening, an interior threaded surface to receive a threaded fluid line and a plurality of projections extending outwardly axially from an exterior surface of the inner member dimensioned to be received within the axially extending slits when the inner member is received within the outer member;

a connector having an end received within the inner member and an opposite end extending out of a back end of the inner member; and

a washer mounted onto the end of the connector that is received within the inner member; and

wherein rotating the outer member about the inner member until reaching a maximum tightening torque causes the outwardly flexible portions to flex outwardly and slip over the projections preventing the maximum tightening torque from being exceeded.

2. The system of claim 1 wherein the projections prevent the outwardly flexible portions from flexing outwardly and slipping over the projections when a loosening torque is applied.

3. The system of claim 1, wherein the axially extending slits extend only partially axially between the back opening and opposite front opening of the outer member.

4. The system of claim 1 wherein each of the outwardly flexible portions have a leading edge at one of the axially extending slits and a trailing edge at another of the axially extending slits.

5. The system of claim 1, wherein the leading edge of each of the outwardly flexible portions is angled inwardly more than the trailing edge.

6. The system of claim 5, wherein each of the projections has an inwardly angled edge and a flat radially extending edge.

7. The system of claim 6, wherein the leading edge of the outwardly flexible portions pushes against the inwardly angled edge of the projections when a tightening torque is applied to the outer member.

8. The system of claim 6, wherein the leading edge of the outwardly flexible portions pushes against the flat radially extending edge of the projections when a loosening torque is applied to the outer member.

9. The system of claim 1, wherein the washer has a maximum axial thickness next to the connector, and a minimum axial thickness furthest away from the connector.

10. The system of claim 9, wherein the washer has a truncated conical shape.

11. The system of claim 9, wherein the inner member has a grooved recess at its back end adjacent to its interior threaded surface, and wherein the thinnest portion of the washer is received against the grooved recess when the washer is positioned flush against a rear wall of the inner member.

12. The system of claim 1, wherein the fluid line is connected to the end of the connector that extends out of the back end of the inner member.

13. The system of claim 12, wherein the fluid line is a liquid fluid line.

14. The system of claim 12, wherein the fluid line is a gas fluid line.

15. The system of claim 12, further comprising:

a shell positioned around an end of the fluid line, wherein the shell has a flattened end positioned against the back opening of the inner member.