公开(公告)号：US3317993A

公开(公告)日：1967-05-09

申请号：US15685661

申请日：1961-12-04

Applicant: TELEFLEX INC

Inventor： DAVENPORT BROUSE WILLIAM HENRY ,  CADWALLADER ALVIN A ,  PIERCE DONALD R

IPC: B21C37/22 ,  B26F1/02 ,  B29C47/02

CPC classification number: B29C47/02 ,  B21C37/225 ,  B26F1/02 ,  B29C47/0023 ,  B29C47/003 ,  Y10T29/49838 ,  Y10T29/49885 ,  Y10T29/49986 ,  Y10T74/20456

Abstract: 956,340. Conduit for control cables; Bowden mechanisms; flexible shafts. TELEFLEX Inc. Oct. 16, 1962 [Dec. 4, 1961], No. 39091/62. Headings F2K, F2P and F2U. [Also in Divisions B3 and B4] A method of forming a flexible conduit includes punching equally spaced holes along the length of a continuously moving flexible strip 18, offsetting the solid portions between the holes alternately towards either face of the strip to form projecting bridge portions 12 and extruding a casing 17 of a synthetic plastics material about the strip. The finished conduit carries a slidable or rotatable wire 16 and forms a control cable. The strip is preferably metal, but may be of plastic. In the apparatus claimed, the strip 18 is drawn from a reel 20 by a device 24 (see Divisions B3 and B4), which punches circular holes in it and offsets the bridges 12. The strip is then hardened in a device 26 where an R.F. generator and coil heat the strip before it is quenched in an oil bath (Fig. 8, not shown), and tempered by passing through a second coil-generator heating device at 170. The plastic cover is extruded on to the strip by the machine 32 and the plastic coating is water-cooled in troughs 34. 36 is a tensioning device with caterpillar belts 176 and 178 which keeps the strip taut throughout the aforementioned processes. Reference has been directed by the Comptroller to Specification 705,792.