US150374A - Improvement in mandrels for welding tubes - Google Patents

Description

s. P. M. TAsKERJ Mandrels for Welding Tubes.

Patented April 28,.1874.

.NTTED STATES STEPHEN P. M. TASKER, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN 'MANDRELS' FR WELDlNG TUBES.

Spetilieation forming part of Letters Patent No.150,374, dated April :38, 1874; application tiled April 4, 1874.

To all uhom it may concern:

13e it known that I, STEPHEN I". M. TASKER, ot' the.V city and eounty ot' Philadelphia, in the. State ot' Pennsylvania, have invented an Improvement in Mandrels and Mandrel-Bars'for lllanut'aeturing Metal Tubes, of which the fol'- lewin g is a speeilieation:

My invention rela-tes t0 the construction of the bar with loose maudrels for eaehpair Ot' rolls when more than one pair of rolls is used in a maehine, and when an internal resistance is required against the pressure of the rolls,

ln thel manufacture of metal tubes, when one pair ol' rolls is used the mandrel is usually ot' eonieal torm, and is placed on a pin on the end ot' the bar 5 but in using two or more pairs ot' rolls, the eonnnon mode has been to have the mandrels put on the bars as swells, either made. i'astas part ot' the bar, or held on by serews or other means, making it ditlieult to ehan ge the mandrels without changing' the bar and the mandrels atthe same time.

l 3 y m y improvement I am enabled to change the mandrels as easilyv as when one pair of rolls is used. 'lo accomplish this purpose I have a shoulder formed on the bar for the inner ball to rest against. This' shoulder l usually make by reducing the end of the bar. 135' this means l maintain its strength, to more eiteetuall y resist the great strain against it as atube is passing over thel mandrels. rlhe bar, however, can be made ofthe reduced site throughout its whole length, byliaving a collar put on to support the inner mandrel. The outer or end mandrel eau be held by the end of the nmndrel-lair takin g the thrust, or by means ot' a shoulder. l use, in combination with the mandrels, a eonneeting-pieee, which is avery little smaller in diameter than the mandrels, to avoid frietion. This middle 4pieee is intended to sustain the tube as it passes over the mandrels. ylt is otl great advantage in ease ot a tube sticking on the inner mandrel while the motion is still aetive on the end mandrel, whieh has the tendency to make the tube laiekle up, making it -dillieult to remove the mandrel from the tube, and ot'ten causing breakage in the machine. rlhe eoiuieetingmandrels B and 13/ with the mandrel-bar A.,

Figs. 4 and 5 represent like eonneetions ot' the mandrels, with the piece (l in combination therewith. v

Like letters ot referenee in all. the figures Vindicate the same parts.

A represents the maiulrel-bar; l the inner, and 13 the outer, mandrel. ln lrigs.. l and -t the main portion ot' the bar is larger than the end portion, so as to insure great' strength to resist the strain upon it as the tube is passing over the mandrels, the end portion A' being rodueed to receive the outer mandrel l3,'and -to form a shoulder at ato resist the thrust ot' the end ofthe inner mandrel l. rlhel mandrelbar may, however, b'e of uniform size throughout its whole length, in whieh ease l form. the shoulder a, t'or the inner mandrel l to .rest against, by means ofthe eollarb. (Seen in lfigs. 2 and It' desired, the outer part A oi' the mandrel-bar may have a shoulder, u', to receive the inner end of the mandrel ll', as seen in Fig. 3. The end part A ot' the mandrel-lair may be either round, square, or other t'orm.

l have represented the mandrels, as to t'orm, like those in genera-l use; yet any deviation therefrom may beadopted without depui-tin from' the prineiple ot' in v invention.

` In Figs. EL and 5 l have represented al piece.,

C, on the part A of the bar, between the inner and outer mandrelsl ll and l'. The object is to prevent the tube being buekled inward by the pressure ot' the rolls when the tube sticks to the inner mandrel ll, whieh sometimes oeenrs. 'lo prevent friet-ion on this inner pieee as the tubes pass over it, it is made. slightly smaller than 'the mandrels, but large enough to prevent the buckling of the tubes when they stiek to the mandrel l. 'lhe said middle piece bein g smaller than the mandrels, and not being rubbed Vagainst by the tubes except when the sticking occurs, it `does not weer outlike the mendrels7 and, consequently, seldom has to be renewed.

I have only represented two mandrcls to a bar, yet it will be seen that :my nulnbcrm ay be used corresponding to the number of pairs of rolls.

The mandrels B and B', and the piece C, are loose upon the mandrel-bar, so as to drop off for cooling as the bar is withdrawn from the tube.

I cla-im as myinvention- 1. The mandrel-bar A, having a projecting piece, A', to receive the inner and outer mandrels B and B', and. a. shoulder, a, to resist the' thrust of the inner mandrel B, substantially in the manner and for the ypurpose described.

2. The combination of the piece C with the part A of the mandrel-bar, and the mandrels B and B', substantially as and for the purpose Set forth.

STEPHEN P. M. TASKEP.

Witnesses: A

THoMAs J. BEWLEY, STEPHEN UsirIoK.

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