Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
B21C37/15—Making tubes of special shape; Making tube fittings
B21C37/16—Making tubes with varying diameter in longitudinal direction
B21C37/18—Making tubes with varying diameter in longitudinal direction conical tubes
Landscapes
Engineering & Computer Science
(AREA)
Mechanical Engineering
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Shaping Of Tube Ends By Bending Or Straightening
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Gewindebohrer mit Schneidbacken, die unter Federwirkung stehen und durch einen zentrisch im Bohrerschaft laengsverschiebbar gefuehrten Bolzen verstellt werden, der zur Verschiebung und Feststellung der Schneidbacken mehrere runde Bunde mit anschliessenden Schraegflaechen besitzt, die vom inneren Ende des Bohrers nach dem aeusseren im Durc hmesser immer kleiner werden