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Publication numberUS1167538 A
Publication typeGrant
Publication date11 Jan 1916
Filing date1 Aug 1914
Priority date1 Aug 1914
Publication numberUS 1167538 A, US 1167538A, US-A-1167538, US1167538 A, US1167538A
InventorsCharles H True
Original AssigneeLocomotive Superheater Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Pipe-bending die.
US 1167538 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Pzztened Jan. 11,









Specification of Lettersetent.

Patented Jan, il, 19nd.,

Application iletl August l, 1914. Serial No. 954,428.

To all whom it may concern.'

Be it known that l, CHARLES H. TRUE, a citizen of the United States, residing at Hammond, county of Lake, State of lndiana, have invented certain new and useful Improvements' in Pipe-Bending Dies, of

which the following is a specication.

lily invention relates to a pipe bending die and has for its object to provide an improved adjustable die by means of Which bends of any desired angle and radius may be placed in a length' of pipe.

More particularly, the object of my invention is to provide a die of the character described by means of Which the location of the bend, with respect to its distance 'from the end of the pipe, may be definitely predetermined by a suitable preadjustinent of the die and so that thereafter, for a given number of pipe lengths, this determined location of the bend may be the same for cach.

A still further object. of my invention is to provide a die of the character described so arranged. that, once adjusted for a given location of the* bend, a pipe may be easily and quickly gripped, bent and released with out the possibility of error in the position of the bend.

Another object of my invention is to provide4 a die of the character described so that the position oi' the bend With referencek to the end of the pipe may be quickly and posi-v tively changed by a definite amount.

My invention will be found particularly useful in connection with superheater ele ments for the flue tube type of superheater, in most known forms of which said elements must be bent as they emerge irom the flue tubes and proceed to the smokebox.

Generally speaking. the total number of elements for the superlfieater of a given locomotive may be separated into four or vc groups according to the distance from the end of the elements at which thebend is located. The improved die of my invention enables all of these bends for the several groups to be accuratelv and quiclilv made.

ln the accompanying drawings, which form a part of my specification, I have shown my invention as applied to a pipe bending machine of the character shown in pipe and the side ot' the the patent to Lassiter Feb. i, i913.

My invention will be better understood by referring to the drawings in Whichl lf'igure l. represents a plan view, part section, of my improved pipe bendii'ig die; lig. 2 represents a. section, part elevation, along the line 2-2 of Fig. l; Fig. i3 represents aA plan View, partly tion through the die and ing the position of the has been bent through 900; and l A, plan view, part section, similar to showing the pipe in position for a different distance from its end.

in the drawings, the bed or frame l of the bending machine, the spindle 2 f having no function when my revolubly mounted hollow shaft 3 keyed to the die at 4, the bending rolle attached to frame (i which itsell3 engaged with guide rails C so rocatcd toward and from the rod 8 of air cylinder 9, are all parts or" the Lassiter machine as shown in the above referred to patent. l

.The die or former .l0 which, as stated above, is keyed to shaft 3, at si, has the form of an elongated plate fith the end, 1]., ad-

NO. 1,052,069 dated guide rollers, showparts atte bending at is slidably as to be recipin horizontal secimproved die is used), the' s 5 revolubly' the*4 pipe 4 die by piston'- jacent to the shaft, curved' to such radius as it is desired to bendV the peripherally grooved diameter of the pipe. die are parallel to one another and provided with dovetailed grooves in which are slidam bly litted a cam member l2 and a jaw rneinber 13. This jaw member i3 is recessed to contorni to the head le (the end as shaped to be attached to the steam collector) of the die into which the Liaw member dovetails is located at such distance from the center line of the die that when the pine le is tangent to and in contact With the peripheral groove of the die, the head lwill lit accurately'into the recess of said jaw member. Y

The bodv ol die l0 has a horizontal slot 15 extending Jfrom a point near the hollow shaft 3 toa point near the end of the die and in this slot lies a `transverse clamp operating shaft 1G one end of which has an easy rotating and sliding it lin a hole l boren"l pipe upon and in conformity with the Opposite sides of the bery 18.

The sleeve like outer end loi. cam member 12 is provided with a pair oi' oppositely ar ranged and'similarljvf disposed notches 9.3'

each of which has one straight face and one concave face which constitutes a cam surface. A transverse riding bar 2o' having projecting ends, passes diametrically through shaft 16 adjacent to cani member lili and is held in position by the collar 2 l itself held 'from slipping oli) by the nut il?.

A spring;` E28 surrounds shaft 1 and held between the inner silemoi cam member 1Q and collar 29 hired to said shaft..

The length of shaft 1G is such that, when vclamp member 1S is drawn against aw inember 13, the riding bar will just elear the end of cam member 1&2 and when the riding bar is at the bottom oi' notches 22% clamp member 18 will. be sutliciently distant 'from the jaw member 13 to permitl the end 11 oi" pipe 14 to be inserted into the recess of said, jaw member.

An adjusting screw 30 has one end Fixed in the outer end of jaw member 153 and passes loosely through a. hole bored in a plate S51 screwed or otherwise fixed to the outer end of die 10. Nuts are threaded upon screw 30 upon each side of said plate. By suitably turning said nuts upon the ser-ew the jaw member 13, together with shaft 113, cam member 12, clamp men'ib'er 1&5 and clamping lever 20, all iixed thereupon, may be adjusted to and fro in the length of the die so as to vary the position of the end or head let of pipe 14; when nuts 32 are tightened upon plate 31 the position 01' the pipe end will be fixed until the described adjusln'ient is changed.

The operation oi? my invention is as fob lows: The several parts of the mechanism being in the position shoivn in Figs. 1 and 2, the pipe 1l is placed in the peripheral groove of die 10 with its previously shaped -v end or head 14 in the recess ot' clamp meinber 13. Clamping lever 2O is then drawn outward and downward, thereby rotating shaft 16 and causing the riding har to rise on the concave cam 'face 21 oi cam member 12', thereby compressing sprine 28 and drawing clamp member 18 toward the jaw mein berlB. As the clamping lever reaches its losvermost position the riding bar .25 will slip out ot' .the notches 23 and lie upon the dat :mentes outer face olf' cam member 1Q and the clamp member 13 will be drawn against the javi' meinba 13 and hold the pipe end 1e iirmly in position.' "lf he bending rollers 5 are then in ved inwardly by the admission of air to air cylinder 9 and the die 10 is revolved,

counter cloele-Wise, to the position shown in Fig. 3 thereby producing a right angle bend in the pipe. revolving the die through a lesser or greaterangle the angle ot bend will be correspondingly changed.

The bending operatioznas above described, is that of the Lassiter patent previously re- -lierred to and l claim no part of the saine as my inventionother than that which has to do withv the clamping et the pipe end. Should itbe desirable to produce a bend in pipe 1st at a great-er or less distance 'from the end of the pipe, the nuts 32 are loosened and the screww 30 rotated in one direction er the other, thereby sliding the adjustable porn tion et the die in or out as the ease may be. The nuts 32 are tightened o' 'when the desired positionfor he pipe end has been obtained. The operations as just above described are then performed. fi; shows the adjustable part of the die set for a distance l'ietvveenpipe end and bead greater than that shown in Figs. l, 2 and llhen the bend has been completed the bendn ing rollers are withdrawn., the clamping lever 20 thrown, upwardly and inwardly,

-thereby permitting the riding bar 25 to drop into the bottoin o'l the notches and spring 28 to move'clamp member 18 avvay from the jaw member. rlhs pipe is then removed.

lllhile l. have shown the die ol' my invention as applied to a Lassiter bendinI chine as disclosed in the previously referred to patent, Al'. do not limit myself to such use as obviously my die may be adapted to va- Arions mechanisms Awithin the spirit oit the invention. Essentially all that is required to use said die is that there be bending rollers or the quivalent adapted to be place-l against the pipe and that the 'eupon said bending rollers and die be arranged to move relativelyT to the axis of the peripheral groove. Furthermore, While l have shown my die as applied to a pipe it is obvious that strips, channel bars, and other linear struetures may be usefully bent therein.

Having described my invention l claim:

ln a pipe bending die of the class dcscribed and adapted to be revolved about an axis, means for holding the end of 'the pipe said means comprising a jaw member and a notched :am member slidably engaged with 'the die, a clamp operating shaft passingr slidably` and rotatably through said jaw and cam members, a clamp member and a riding,f bar fixed to said shaft and the length of said shaft being; such ythat when the riding bar is iree 'of l notches the clamp and members are eraivn tog-ether while when the the plate 31 of the notches r are'sepaz ,e 'pipe means 5 engaging both the die and the pipe end holdu lng means whereby along the die with r the latter may be moved espect to the axis thereof.

In testimony whereof, have hereunto set my vhand in the presence of two subscribing Witnesses. r.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2436776 *17 Mar 194424 Feb 1948Goodyear Aircraft CorpReversible tube bender with side angle indicator
US2862540 *1 Feb 19542 Dec 1958Ryan Aeronautical CoExpanding clamp for a tube bending machine
US3043360 *19 Nov 195910 Jul 1962Hutchison Charles BForming machines
US3242710 *22 May 196329 Mar 1966Pines Engineering Co IncContour roll bending machine
US3292404 *26 Feb 196420 Dec 1966Anchor Coupling Co IncManufacture of bent tubes with flare couplings
US4178788 *24 Mar 197818 Dec 1979Eaton-Leonard CorporationAdjustable clamp die
US4691555 *21 Apr 19868 Sep 1987Vaughan Donald RTube bending tool
US4899567 *28 Nov 198813 Feb 1990Societe Nationale D'etude Et De Construction De Moteurs D'aviation (Snecma)Method and apparatus for bending tubes with end fittings
US5918496 *13 Nov 19976 Jul 1999Eagle Precision Technologies, Inc.Adjustable clamp die for tube bending machine
US7134310 *30 Nov 200414 Nov 2006Ying Lin Machine Industrial Col., Ltd.Tube bender
US20050168315 *24 Jan 20054 Aug 2005Russel BrownHigh capacity fuse and arc resistant end caps therefor
US20060112752 *30 Nov 20041 Jun 2006Ping-Kun HuTube bender
CN105499341A *25 Dec 201520 Apr 2016四川航天世东汽车部件有限公司Bending positioning tool for car operating lever
DE958802C *5 Sep 195221 Feb 1957Hilgers Masch & App BauanstaltRohrbiegemaschine mit hydraulischem Antrieb fuer wechselnde Biegerichtung
U.S. Classification72/159, 72/199, 72/459
Cooperative ClassificationB21D7/024