Compression pressure indicator

• US 4,655,159 A
• Filed: 09/27/1985
• Issued: 04/07/1987
• Est. Priority Date: 09/27/1985
• Status: Expired due to Term

• Current Assignee: Raychem Corporation (TE Connectivity Limited)
• Original Assignee: Raychem Corporation (TE Connectivity Limited)
• Inventors: McMills, Corey J.
• Primary Examiner(s): Frankfort, Charles
• Assistant Examiner(s): Worth, W. Morris
• Application Number:
  US06/781,386
• Time in Patent Office: 557 Days
• Field of Search: 116/212, 116/DIG. 34, 116/306, 116/307, 116/321, 116/322, 116/208, 116/281, 116/282, 116/283, 116/323, 73/761, 73/762, 411/8-14, 174/75 C, 174/88 C, 277/2, 277/190, 277/191, 277/122, 277/117, 277/110, 277/112, 277/121, 285/93, 285/249, 285/382.7, 339/177 R, 339/177 E, 403/27, 403/342, 403/370
• US Class Current: 116/212
• CPC Class Codes: B25B 23/14 Arrangement of torque limiters or torque indicators in wrenches or screwdrivers couplings for transmitting rotation or clutches F16D; devices for measuring torque per se G01L
• CPC Class Codes: F16B 31/02 for indicating the attainment of a particular tensile load or limiting tensile load apparatus for, or method of, determining value of torque or twisting moment for tightening a nut or other member similarly stressed G01L5/24
• CPC Class Codes: G01L 5/24 for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed
• CPC Class Codes: H01R 9/05 for coaxial cables
• CPC Class Codes: Y10T 403/20 with indicator or inspection means

Abstract

A compression pressure indicator includes a compression member which is disposed within a termination and is constructed such that when exposed to a pressure above a predetermined pressure a portion of the compression member protrudes from the termination thus indicating that optimum pressure has been applied inside the termination. The compression member includes an indicator portion and a collapsible portion, the collapsible portion being shaped such that when exposed to a pressure above the predetermined pressure, the collapsible portion collapses thus allowing relative movement between the indicator portion and pressure extending member such that the indicator portion protrudes a predetermined distance from an end of the pressure exerting member.

Claims

1. A compression pressure indicator, comprising:

a compression member;

means for exerting pressure on the compression member in an axial direction;

the compression member being made of a material adapted to be deformed when subjected to pressure to form a seal between surfaces formed by the pressure means in contact with said compression member, the compression member including an indication portion extending from one end thereof and further including a collapsible portion adapted to receive pressure axially from one portion of the pressure means, said pressure means completely surrounding the compression member, the collapsible portion and the indication portion being constructed so as to form a V-shaped channel therebetween, the collapsible portion upon being subjected to a predetermined excessive pressure by said pressure means collapses allowing the compression member to move and fill the V-shaped channel such that at least part of the indication portion is urged out of the pressure means to provide a visual indication that further pressure is not required.

2. The compression pressure indicator of claim 1, further comprising means for focusing deformation of the compression member.

3. The compression pressure indicator of claim 2, wherein the compression member, the focusing means, and the pressure means each has a ring-type shape.

4. The compression pressure indicator of claim 3, wherein the indicator portion of the compression member is disposed adjacent an inner ring surface of said portion of the pressure means.

5. The compression pressure indicator of claim 4, wherein the pressure means comprises a driver member engageable with a mounting member.

6. The compression indicator of claim 1, wherein the collapsible portion has a cross-sectional profile such that upon collapsing a longitudinal length of the collapsible portion significantly decreases while a longitudinal length of the compression member significantly increases so as to allow the indication portion to move a significant distance relative to the pressure means and extent outward from a back end of the pressure means.

7. The compression pressure indicator of claim 6, further comprising means for focusing deformation of the compression member, the focusing means, the pressure means, and the compression member being disposed about an end of a coaxial cable, and the indication portion being disposed between an outer jacket of the cable and an inner surface of said portion of the pressure means.

8. The compression pressure indicator of claim 6, wherein the collapsible portion has a tapering V-shaped cross-section.

9. The compression pressure indicator of claim 6, wherein the compression member forms an environmental seal when deformed.

10. A termination, comprising:

a compression member;

means for focusing deformation of the compression member; and

means for axially driving the compression member against the focusing means so as to deform the compression member;

the compression member having a ring-type shape and having an indicator portion at one end thereof, the driving means having a ring-type shape and having an internal diameter on a portion thereof large enough to allow at least part of the indicator portion to be concentrically disposed within the driving means so as to allow the indicator portion to extend therefrom, the compression member having a collapsible portion therein having a strength less than that of the focusing means and said portion of the driving means, the collapsible portion and the indicator portion being constructed so as to form a V-shaped channel therebetween such that when the compression member is pressurized beyond a predetermined amount by movement of the driving means toward the focusing means the collapsible portion collapses against the driving means allowing the compression member to move and thereby fill the V-shaped channel and cause the indicator portion to move at least partially outside of said portion of the driving means.

11. The termination of claim 10, wherein the focusing means has a ring-type shape.

12. The termination of claim 11, wherein the indicator portion is disposed adjacent an inner ring surface of the driving means.

13. The termination of claim 12, further comprising a mating member engageage with the driving means.

14. The termination of claim 11, wherein the collapsible portion has a cross-sectional profile such that upon collapsing a longitudinal length of the collapsible portion significantly decreases while a longitudinal length of the compression member significantly increases so as to allow the indicator portion to move a significant distance relative to said portion of the driving means and extend outward therefrom.

15. The termination of claim 14, wherein the focusing means, compression member, and the driving means are disposed about an end of a coaxial cable, the indicator portion being disposed between an outer jacket of the cable and an inner surface of the driving means.

16. The termination of claim 10, wherein the collapsible portion has a tapering cross-section.

17. The termination of claim 16, wherein the tapering cross-section is substantially V-shaped.

18. The termination of claim 10, wherein the collapsible portion is made of a material and being shaped such that it substantially collapses when pressurized above a predetermined pressure.