TUBE END PORTIONS THREADING APPARATUS Russian patent published in 2007 - IPC B23G1/24 

FIELD: working materials by cutting, threading operations at mounting pipelines for heating and water supplying, mainly in field condition.

SUBSTANCE: apparatus includes head with central opening for inlet of worked article and with clamps for securing cutters. Said head is mounted in attachment providing its basing and rotation around worked tube. Apparatus also includes handles and base-clamping mechanism. In order to simplify design of easily transportable apparatus, base-clamping mechanism includes tubular guide having shoulder and two grooves in its mean portion, threaded zone and open groove in one end of tube, sleeve with two outer and two inner turnings and radial openings in its ends, two springy slit rings mounted without axial shift in outer turnings of sleeve. One of said rings has annular recess in its central portion. Other ring has axial recesses coinciding with radial openings of sleeve. Said mechanism also includes balls; retainer races; two clamp rings movably mounted in guide and having axial slits, radial raceways for balls in their cone portion and internal thread on their rims; nut with outer thread for joining with one clamp ring and with central threaded opening. Said nut enters grooves of guiding key. The last has outer thread in its wings for joining with other clamp ring and left-hand thread in central opening. Screw with right-hand thread in its end and left-hand thread along its large diameter for joining with nut and with key respectively is also provided. Head includes body with central threaded opening and cylindrical turning in inner end of threaded opening; two bosses; rim in one cylindrical surface; flat and groove in other cylindrical surface. In order to form outer thread, apparatus is provided with detachable rotary support mounted on axles in openings of said bosses and having two shelves with openings. Cutter is mounted in opening of one shelf. Follower screw with ball is mounted in threaded opening of other shelf. Said shelves are placed at different sides relative to said axles in the same axial plane of threaded opening of head body. Shelf with follower screw enters grooves of body. Clamping mechanism is mounted on flat of body and it has cleat with openings. In one of cleat openings stop with washer, nut and pack of disc springs is arranged. Said springs acts upon stop engaging with support. In order to form internal thread, apparatus is provided with support sleeve mounted in cylindrical turning of head body. Apparatus includes set of parts for driving head. Said set is mounted in guide and it includes

thread follower for forming outer thread, angle follower for cutting outer thread and angle follower for cutting internal threading and it has for forming internal thread guiding sleeve and angle follower for cutting internal thread.

EFFECT: improved simplified design of transportable apparatus.

6 dwg