US1491409A - Threading device - Google Patents

Description

April 22, 1924. 1,491,409v

vS. LEE V THREADING DEVICE Filed April 20. 1923 2 Sheets-Sheet 1 April 22 1924.

' THHEADING DEVICE Filed April 20. 1923 2 Sheets-$heet 2'v y 1,491,409 O. S. LEE l.

Fatented Apr. 22, 1924.

OTTAB S. LEE, OF CHICAGO, ILLINOIS, ASSIGNOR' TO THE NYEl TOOL & MACHINE WORKS, OF CHICAGO, ILLINOIS, A COVRPOBVATION OF ILLINOIS.

THREADING DEVICE.

Application led April 20, 1923. SerialANo. 633,420.

To all who/m, 'it may concern:

Be it known that I, OTTAR S. LEE, a citizen of the United States, residing at Chi-- cago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Threading Devices, of which the following is a specification.

My invention relates, more particularly, to devices for forming threads on the ends of objects, more particularly pipes and rods; and my primary object is to provide a device which shall be adapted for threading larger pipes by employing thread-cutting chasers, and smaller pipes by employing die blocks, thereby avoiding the necessity of providing separate devices for utilizing the chasers and die blocks in the cutting of larger and smaller objects, respectively.

Referring to the accompanying drawing:

Figure 1 is a face view of a structure embodying my invention. Figure 2 is a section taken at the line 2-2 on Fig. 1 and viewed in the direction of the arrows, Figure 3 is a section taken at the line 3 on Fig. 1 and viewed in the direction of the arrows, and Fig. 4 an enlarged section of the body of the device with .the chasers positioned therein for use, the section being taken through opposed chasers, with the chasers shown in section.

The particular construction illustrated comprises a ring-like member 3 formed at one end with a peripheral fla-nge 4, its opposite end being screw-threaded, as represent-V ed at 5, to receive a ring 6 screwed thereon and forming, with the body of the ring 3 and liange 4y a peripheral annular groove 7 in which a ring 8 is rotatably confined, the ring 3 being internally screw-threaded, as represented at 9. The ring 3 is provided with a series of lugs 10 extending lengthwise of the device and provided in a circumferential series, these 'lugs terminating, at theirA outer ends, in a ring-shaped head 11, concentrically disposed relative to the ring 3, the head 11 being provided at intervals with radially-extending set-,screws 12, located in threaded openings 13,1n the ring 11, these set screws being provided for the purpose hereinafter set forth.

The device also comprises a head 14 comprising a tubular portion 1 5 externallyl screw-threaded, as represented at 16, and screwing into the threads 9 of the ring 3, the threads 9 and 16 forming a lead-screw for the purpose hereinafter explained. The

outer end of the member 15 is provided with radially outward from the object beingVv threaded thereby, asAV the threading opera# tion progresses, the ring 8 is provided with a series of pins 21, four of which are shown to. correspond with the number of "bosses 17, these .pins extending parallel with the axis of the device and extending into openings 22 in the bosses 17, in which they, have sliding fit. The pins 21 extend into rthe grooves 19 and are each formed with an inclined surface, extending longitudinally thereof7 as shown of the surfaceA 23 ofthe one of the pins shown in Fig. 3 and the two pins in Fig. 4, the surfaces 23 diverging toward the right hand end of Figs. l2 and 4.

The innerl endsV o f the bosses -17 are sub-l stantially straight, these straight end surfaces, represented at V24, being preferably disposed at substantially right angles to each other, with the surfaces 24 of the diametricallyfopposed'bosses being parallel and` substantially equally spaced apart, whereby the space bounded by the end surfaces 24 of the bosses 17 is such as to receive a die block such as is commonly used for forming threads on objects such as pipes or rods. A die block of the kind referred toV is represented at 25, it being formed of a body portion 426 of square form containing a central 4aperture 27 into which the cutter ends of the thread-cutting segments 28 secured iny the body-portion 26, in radiating vposition thereon, extend.

The device also comprises `-releasable means for holding the die block in the space bounded by the bosses 17, these means being of any suitable construction, those shown comprisinga plate 29 adapted to be laid across the outer face of the Vdie block 25 and provided with rearwardly-projecting portions 30 and 31, the portion 30 having a engage the rearfsurface of the one vot theY Webs 18 tliainetrically opposed tothe Wel) which is engaged oy the flange 32,V the portion of the plate 29 Where it overlaps the lolocl; 25 loeing apertured as represented i For the threading or" objects, such as pipes or rods, from say of one inch diameter upwards, the die liloclr clamping ineans, and also the die hlocl; Y25, would he reinoved from the position shown in Figs. l and v2, and the chasers 100, such as are coinz'nonly employed in die stocks, and ot a length and torni suitable for operating on the particular diameter of object to he threaded, inserted into the grooves. 19. The operator then selects a bushing of an internal diaineter sulostantiallj-,fv the saine as the external diameter or the object to he threaded, and ins rts this bushing into the opening in the ring-shaped ineinher ll, the Ytorni ohushing being sulostan tially that shown at 35 in Figs. 2 and e, 'the opening through this 1oushing 1seing represented at 36. rlhe de- 1ice is then slipped over the endy of the pipev to be threaded, to cause the chasers 100 in the grooves 19 to entend adjacent the eX- treinity of the pipe et which the threads are to he produced, the bushing surrounding the pipe, and the operator then tightens up the set screws l2, which extend through openings 3? Vin the bushing, 'to set there rigidly against the ohject to he threaded, rigidly securing the ring 3 against rotation on the pipe. rl`he operator rthen rotates the nieniher le carrying the chasers, handles 38 inserted into socket inernhers 39 torined as part o'tvtwo of the bosses facilitai'ing rotation oi the inenieer le, the teeth ot the chasers cutting into the pipe to he threaded. rlhe threaded connection-between 'Y the part l5 and the ring 3 operates, when the inernher le is rotated in clockwise direction in llig. l, to cause the niemher l, with the chasers 100,Y to'rnove to the right in Figs. Qand l and consequently lengthchasers to cut a thread on the pipe corresponding With the thread 16. As the memher le nieves to the right in Figs. 2 and fl, :is stated, the pins 2l being held by the rotatable ring 8, against lengthwise movenient, the chasers 100 are, 'hy reason of the inclined surfaces 23 ot these pins and against which the outer ends of the chasers e0 hear, permitted to inove radially outward sufciently to eect the tapering of the thread produced on the object, as Will he Well understood in the art.

When it is desired to thread an object of smaller diameter the chasers are removed ise of the pipe, thus serving to cause the i l?) and a die hloolr 25, hrea-ding ol'v an ologect of to he threaded, is app. ce the position shown in -hete plained, f with s' he die hloclr s reo; e to inerme the positiond'e ol-fick et a ight Tle to the ovile, and t .ns

Y d to 'a stilooi thing of the `fed into ne hushing ai enough to grip the object. y

bloc-lr 25, the .i vice is slipped over the end 'the object to he threaded and the entire device rotated on thc pipe, the cutting segments 28 producing the desired thread on the object, it being understood that` as 'these die blocks are cominonf/Y cromo-ed,

they operate to cut the thread on the object Without requiring any additional ineens for feeding it along the pipe, suoli ss the lead screw means J and lo and which is required in the cose of the use oi chasers Aas cornnionly provided and hereinloeiore dcscilied. lt is desirahle that when the diehlocl; 25 is in place and the plate 29 secured in clampg position, thelilocl; 25 may shift in a action crossii'ise of the axis the device, in the event that the s ot die hloclfA is out oit alinenieiit with the axis oit the pipe. in order that the die hloclr maj; aline with the pipe. this heineY preferably provided for his so proporlioning the parts or' the device that the in which the die hloclt is located is o?. slightly7 laW r diniensions than the die block, and to permit the hloclr to slip as statorl the distance troni he outer seating-'taces"oi the seating lugs i8@ to the outer faces et the bosses l7-is slightly greater th an the thickness of the die hloclr 25, and the plate 29 is provided of such shape and size that it will tit tlatwise against the outer faces ot the bosses '17, as shown.

lt will be understood from the foregoing that instead of requiring separate devices for receiving and holding chasers and die blocks, respectively, for the threading of larger and smaller pipes, one receiving and holding device only is necessary, the Workmen using chasers ordie blocks with the saine device, depending upon the size ,of the object to Vbe threaded.

lt may be stated, as regards the particular torni of means shown for holding the die hloclr 25 in place, that as these means are bodily removable, though not indispenpreviously the use oli the device with the die LSU sable to the carrying out of my invention, the device is rendered entirely free o any parts the presence of which might be objectionable when the device is being used with chasers in the grooves 19.

Vhile I have illustrated and described a particular construction constituting an embodiment of my invention, I do not wish to be understood as intending to limit it thereto as the same may be variously modified and altered Without departing from the spirit of the invention.

TWhat I claim as new, and desire to secure bj: Letters Patent, is:

1. A thread-cuttingdevice comprising a member containing an opening and adapted to hold thread-cutting chasers in operative position at said opening, those surfaces of the portions of said member at which said chasers are held, and which are disposed about said opening, being disposed at substantially 90O to each other and in opposed relation, adapting said member to receive a die block within the space bounded by said port-ions, and means for releasably hold ing the die block in said position on said member.

2. A thread-cutting device comprising a member containing an opening and provided with bosses radiating from said opening. said bosses being adapted to hold thread-cutting chasers in operative position at said opening, the inner end surfaces or said bosses being so disposed as to afford a spa-ce adapted to receive a die block which bears at its rear face aga-inst portions of said member between said bosses, and means opposing the outer face of the die block for releasably holding the latter in position on said member.

3. A thread-cutting device comprising a member containing an opening and adapted to hold thread-cutting chasers in operative position at said opening, the portions of said member at which said chasers are held being so disposed as to adapt them to receive into the space therebetween a die block. and means for releasably holding the die block in said position'on said member, the parts' being so constructed and arranged that the die block may shift in a plane at an angle to the axis of the device,

4. A thread-cutting device comprising a member containing an opening and provided with bosses radiating from said opening, said bosses being adapted to hold thread-cutting chasers in operative position at said opening, the inner end surfaces of said bosses being so disposed as to aord a space adapted to receive a die block which bears at itsrear face against portions of said member between said bosses, the distance from the outer faces of said bosses to the portion of said member which opposes the rear face of the die block being greater than thethickness of the die block to permit the die block to aline with the axis of the pipe by shifting in a direction crosswise of the axis of the device and a plate on said member opposing the outer face of the die block and bearing against the outer facesoi':` said bosses, for releasably holding the die block in position on said member, said die block being shitable in a plane at an angle to the axis ot' the device.

A thread-cutting device comprising a member containing an opening and adapted to hold thread-cutting chasers in operative position at s aid opening, the portions of said member at which said chasers are held being so disposed as to adapt them to re-k ceive in the space therebetween a die-block, and means for releasably ho-lding the dieblock, in said position on said member comprising a clamping plate extending across the outer face of the die-block and provided Y with rearwardly-projecting portions one of which is equipped with a flange adapted to overlap the rear face of said member and the other being provided with a screw adaptcd to engage the rear face of said member at a point opposite to said overlapping flange, whereby to releasably hold said die-block inplace. Y Y

oTTAR s. LEE.

Images