公开(公告)号：US2125552A

公开(公告)日：1938-08-02

申请号：US8935336

申请日：1936-07-07

Applicant: KRONPRINZ AG

Inventor： FELDHOFF PAUL

IPC: F16B7/02

CPC classification number: F16B7/025 ,  Y10T29/49945 ,  Y10T403/4916 ,  Y10T403/4924 ,  Y10T403/4958 ,  Y10T403/4966 ,  Y10T403/7039

Abstract: 458,067. Tube joints. FAHRZEUGWERK P. FELDHOFF GES., Radevormwald, Rhineland, Germany. June 26, 1936, No. 17795. Convention date, Dec. 12, 1935. [Class 99 (i)] A joint for long, thin tubes, particularly in bicycle frames comprises a sleeve c the bore of which widens from the ends inwards and having a central partition c . A cylindrical member d fitting each tube, and having a conical bore, is forced down over a loose cone e expanding the tube into close contact with the sleeve. The cones may be integral with the partition c and the contacting surfaces of the tubes and sleeve may be roughened or grooved.