Claims
- 1. A bar stock feed tube assembly for metal working machines that provides a supporting structure through which lengths of bar stock may be fed, comprising: an elongated outer cylindrical metal tube, a slightly shorter inner cylindrical sound damping and wear liner coaxially disposed within the tube, and a pair of annular locking rings to secure the liner within the tube;
- the liner comprising a tubular extrusion of ultra high molecular weight polyethylene and a ribbon of a foamed resiliently compressible thermoplastic material spirally wrapped around the surface of the liner, the interior diameter of the tube, the outer diameter of the liner, and the thickness of the ribbon being selected to hold the spiral wrapping in compression along substantially its entire axial extent when the liner is positioned within the tube;
- the locking rings having an outer diameter essentially the same as the inside diameter of the tube, an inside diameter slightly greater than the inside diameter of the liner, an enlarged annular shoulder adjacent one end of the rings having an outside diameter essentially the same as the outside diameter of the tube and means to fixedly position each locking ring in opposite ends of the tube.
- 2. A bar stock guide tube assembly as set forth in claim 1 where adjacent convolutions of said spiral wrapping are spaced from each other to provide a spiral dead air space within said outer tube.
- 3. A bar stock feed tube assembly according to claim 1 wherein the means to fixedly position the locking rings is an annular groove in the surface of the rings into which a surrounding portion of the tube may be deformed.
- 4. A bar stock feed tube assembly according to claim 1 wherein the ribbon is compressed approximately 50 percent of its relaxed thickness when the liner is positioned within the tube.
Parent Case Info
This is a continuation of application Ser. No. 603,079 filed Aug. 12, 1975, now abandoned. Application Ser. No. 603,079 is a continuation of application Ser. No. 398,341 filed Sept. 28, 1973, now abandoned.
US Referenced Citations (3)
Foreign Referenced Citations (1)
Number |
Date |
Country |
1306157 |
Feb 1973 |
GBX |
Non-Patent Literature Citations (3)
Entry |
"New Design of Noiseless Bar Guide," R. Perelmuter, published in GB Machines & Tooling, No. 7, 1965, p. 47. |
"Hercules Abrasion Resistant 1900 UHMW Polymer," a guide published Hercules, Inc. 1970. |
Modern Plastics Encyclopedia, vol. 49, No. 10A, Oct., 1972, p. 86. |
Continuations (2)
|
Number |
Date |
Country |
Parent |
603079 |
Aug 1975 |
|
Parent |
398341 |
Sep 1973 |
|