Title:
APPARATUS AND METHODS FOR FORMING INTERNALLY AND EXTERNALLY TEXTURED TUBING
Document Type and Number:
WIPO Patent Application WO2002024365
Kind Code:
A3
Abstract:
A machine (20) may produce a tube (28) having textured internal and external surfaces (22, 24) in a single operation. Inner (36) and outer knurling tools (42) may form the textured surfaces. The texturing of the internal and external surfaces (22, 24) may be helical patterns of ribs (32) and grooves (30). The height of the ribs (32) formed in the internal and external surfaces (22, 24) may be less than about 35 mils. The angles of the patterns relative to a longitudinal axis of the tube (28) may be less than about 45 DEG . The angle of the helical pattern allows textured tubes (28) to be used as heat exchanger elements wherein flow is directed substantially coaxial to the longitudinal axes of the tubes. The helical pattern formed in the external surface (24) may be oriented in a right hand or left hand helical orientation. Similarly, the helical pattern formed in the internal surface (22) may be oriented in a right hand or left hand orientation.
Inventors:
ZIFFERER L ROBERT
Application Number:
PCT/US2001/029710
Publication Date:
June 13, 2002
Filing Date:
September 21, 2001
Export Citation:
Assignee:
PACKLESS METAL HOSE INC (US)
International Classes:
B21C37/20; (IPC1-7): B21C37/20
Foreign References:
| US5992512A | 1999-11-30 | |||
| US5551504A | 1996-09-03 | |||
| DE2515312A1 | 1976-10-21 |
Download PDF:
Previous Patent: TIRE OR HOSE WITH DRAWN COMPACTED BELT CABLE
Next Patent: DENT REMOVAL TOOL WITH CONTROLLED CONSTANT PULLING FORCE
Next Patent: DENT REMOVAL TOOL WITH CONTROLLED CONSTANT PULLING FORCE