US1616650A - Thread-cutting tool - Google Patents

Description

' I I 1616650 Feb. 8,1927. v & BORDEN V 2 THREAD CUTTING TOOL Filed M'rch 23.- 1925 M Illlllllifli I I I mu 2 Sheets-Shed 1- work even in a Patented Feb. s, 1927."

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BRADFORD BURDEN", OF' GLEVEL'ZAND, OHIO.-

TI-IBEAD-GUTTIN G TOOIn- Application filed March 23, 1925. Serial-No. 17,737

1 The pipe threading tool: forming the subject-matter of thepresent designed particularly with: a view to the cutting of various s zed work with. but one without necessitating the V 5 set of dies and removal of the dies from the stock. The invention contemplates among other things aconstruction wherein the dies may be quickly and accurately set v poorly lighted shop, and

which once havingbeen set will beelfective- 1y held in set posit on against accidental' movement during the manipulation of the v tool either in thethreading. operation or in the changing from one piece of'worli to anothen. v p

Otherobjeotsof the invention are to provide a slidablesupport for each die wl'iioh v is controlled in'a Y movement toward an 2 from the axis ofthework by the movement 0f-the die stock; to furnish an adjusting means for each die and anovehconnection between said adjusting'means and die where-.

by the in use,and

samewill not become separated while generally to provide a construction which Wlll be of a very simple and: durable nature and highly eflicient in prac' tical use,

The various features of novelty which 39 characterize my invention are pointed'out with particularity in the claims annexed to. and forming, apart of this specification, For t a. better understanding oftheinvention, however,v

accompanying drawings in connection with a the follow-ing descriptilvematter, the drawin'gs' depicting what I now regard as a preferred; embodiment of the-invention. v we Iathe, drawings, wherein. like reference 40 characters denote like parts throughout all 'VlGWS g v Figure 1 isa top planiview of a diestock embodyingmyinvention; V

Figure 2 is an elevation;

Figure 8 is a fragmentary vertical sec tionalview; 7 I Figure 4 isa section on the'line of li i ii; v Y iigure :51 is. a section onnthe line 545 of v j iguredis an innerend view ofoneof the slidewaysy l a a Figure 77" is a perspective detail of 'a washer, and" p i v v 55 Figure 8Lis a, sectional view similar to Figure 3-illustrat1ng a modificati on.

invention has been 7 for different sized 1 reference should be had to the i in Tshaped slot opening-of the I trolled by means of a set screw 12; Itfisto Referring specifically to the drawings,

the numeral 1 denotesa work holder'whichi an annulus or pl'ate3" from which rise posts fl, the; same being] slidably' received in holes eXte'ndingtrans-f, versely through the longitudinally slotted. bosses 6 of the die stock 5; Aring thread-2 ed upon theneck 2 of the work holder serves to retain the annulus 3 against displacement" but permitting rotation portion of the neck 2 is threadedfor the reception'of the leader screw- 8' carried by thedie stock 5 whereby progressively moved in work holder as; the threading operation progresses. This is a well'known and famil iar construction in theartQ The slots or slideways 9 in the bosses 6 are radial-1y arranged andcommunicate entirely through the said vbosses from the work' receiving opening of the die stocks; It is to be noted that the. transverse post holes in the bossesfi are so drilled asto intersect" the sli'dewaysfl' adjacent one side; also "thatthe posts 7 are provided with a flat longitu dinal face the edges of-which are designed to lie flush with the side wall of each slide way. be fullyexplained hereinafter. i a

v As clearly shown in Figure-3; the'slideways 9' receive sliding die carriers 10 of a thereof. The inner" the latter willfbe the direction of 'the' The purposeof this construction will width equal to the width of theslideways rier; The inner end "of" the screw'12'i's forme'dfwith a head 12* which is receivable 11? extending" crosswise ofthe die.,. Thus'the-movementofthe die either toward or from the work receiving die stock is positively con-v be noted that the head '12 "of the screw "can only be located in the-T-shaped slotll of the die when the carrier is out of the slide way 9. V When-the die and' cafrrie'r are the slideway the side-walls and overhanging top walls thereof engage the assembled members. to prevent such: relative movement as would permit disengagement ofthe same,

dies or chasers 11; relative aperture in the upturnedlend '10? ofits car By adjustably positioning the dies 11 in the carriers 10 it is possible to thread work of difierent sizes with but one set of dies. A means has been availed of whereby the dies can be accurately set for threading standard sized work. This means comprises the formation of the outer portions of each screw shank without threads and cutting therein a plurality of circumferential grooves 12 which are spaced certain distances the one from the other. This distance is equal to one-half of the difierence between the diameters of standard sizes of pipe or other work. As shown in Figure 3, I have provided what might be termed a washer 13 having an over-sized opening to receive the screw '12. The washer is located between the thumb-piece 14: of the screw and the upstanding end portion 10 of [the carrier 10. When work of a certain size is to be threaded the washer is located in the appropriate groove 12 and the screw'advanced by means of thethumbpiece 14; until the washer snugly abuts against the outer face of the end of the carrier. This action causes the washer to bind in the groove in which it is located. Thus the screw will be locked against accidental turning and it will take a good firm twist on the thumb-piece 14 to loosen it, it being understood that the washer binds against the end of the die carrier and in the groove, which will obviously produce the result above set forth.

It has heretofore been stated that the posts 4 have flat faces which, during the movement of the die stock, lielliisli with oneof the side walls of each slideway 9. These flat post faces are denoted in the drawings by numeral 7*, and in Figure 3 the said flat post faces are clearly shown as being formed with diagonal surface grooves 7 arranged in adirection leading away from the axis of the work, the lower ends 7 of such grooves being curved abruptly in a direction away from the axis of the work. The grooves 7 are open at the upper ends of the said. posts to receive lugs 15 extending from one side of each of the carriers 10. The grooves 7 are designed to sustain the carriers 10 in the thread. cutting operation; also to efi'ect a gradual recession of the carriers as the, operation proceeds, acting of course, through the lugs 15,- and finally through the instrumentality of the abruptly curved groove portions 7 to precipitously actuate the carriers to completely withdraw the dies from the work.

When it is desired to move the carriers from the slideways 9 it is only necessary to elevate the diestocks on the posts a sufficient distance so that the lugs 15 of the carrier will be clear of the post grooves 7 The slides 10 can then, of course, be slipped out of the slideways 9. The posts 7 are of of the stock 5 when various odd sized work is to be threaded. g

The die stock is rotated in' the usual manner by handles 16 received in sockets 17 carried at diametricallyopposite points on the diestock. Upon one of the handles 16 I have illustrated a magazine for extra dies 11, the same comprehending fixed and slidable collars 18 and 20. ' Circumferential flanges 18 and 20 respectively,-engage the ends of the dies 11 to hold them in place. A spring clip 21 engages notches 22 in the handle section to hold the collar 20 against outward sliding movement. A pin 19 passing through the member 18 and the handle 16 maintains the said collar member 18 fixed. In Figure 8 I have illustrated a slightly modified construction whereby the screw 12 will be locked in a tion. Here a spring clip 23 is fixed to the upturned end 10 of the carrier 10 andhas a depending portion 24 with an arcuate edge recess which is designed toengage in a selected groove 12. in either direction willbe prevented by the binding of the clip portion 2-1 against the walls of the selected groove. In this modification the screw 12 has no positive connection with the end of the die 11. Instead the carrier 10 is provided with a spring pressed stud which is denoted by numeral 25 and which is adapted to engage in rounded recesses 26 in the bottom ofthe die 11. The screw 12 of course sustains the die 11 duringv the threading operation and the stud 2a engaging the recesses 25 causes the die to recede withits carrier.

The invention eliminates amultiplicity of parts likely to get out of order.' No chips can obstruct the operation of the tool and upon the completion of one piece of work it is unnecessary to back thread which operation is very hard on the die teeth besides taking up considerable time;

What I claim as new and desire to secure by Letters Patent is 1. The combination with a work receiving opening communicating therewith; of a die supporting member arranged insaid slideway, a die removably carried by said member and adjustable relatively thereof, a boss carried by saiddie supporting member, a screw threaded through said boss and engaging a diestock having and a slideway predetermined posi-V Turning of the screw said die ,for actuatingthe same in the direcoperation, the shank of said screw adjacent its head being unthreaded and having a plu-z rality of circumferential grooves spaced to,

exactly agree with the ratio of difference in the diameters of standard sized work, and means selectively engaging said grooves to prevent movement of said screw to thus maintain the die in position to thread work of a predetermined diameter.

2. The combination with a diestock having a work receiving opening and a slideway communicating therewith; of a die supporting member arranged insaid slideway, a die removably carried by said member and adjustable relatively thereof, a boss carried by said die supporting member, a screw threaded through said'boss and engaging said die for actuating the same in the direction of the work, said screw constituting a stop for sustaining the die in the threading operation, the shank of said screw adj acent its head being unthreaded and having a plurality of circumferential grooves spaced to exactly agree with the ratio of difierence in the diameters of standard sized work, an adjustable stop carried by said screw to selectively engage in said grooves whereby to engage the end of said boss when the screw is tightened to limit inward movement thereof, and said stop being adapted to bind against said boss and the walls of the groove in which 't 's positioned to restrain said screw against rotation.

3. The combination with a diestock, its dies, and screws threaded through tapped bosses and engaging the dies for moving the same toward the work; of each screw having a plurality of spaced transverse grooves, an abutment selectively positionable,

in said grooves, said abutment being adapted to bind against said boss and the walls ofsaid grooves when the screw is tightened to restrain the same agalnst movement. I

.fixedstop for its die,

. ward movement ation. each screw having a plurality of lonagainst movement. In testimony whereof I affix my signature. v

4:. The combination with a diestock, a die 'member,and a die posedbetween said the latter constituting,

designed to engage and bind in said grooves when brought to bear against said tapped member.

5. In a diestock, a die on which'the dies are die carrier for 'each relatively adjustable for variously sizedwork, a boss formed upon each of said carriers and forming a fixed stop for its die, a screw working in said boss and sustaining its die ward movement in the thread cutting operation, each screw having a plurality of longitudinally spaced recesses therein, and means engaging in said recesses and against said boss for determining the proper position of said screw for threading work of a predetermined size.

6. In a diestock, a die carrier for each die on which the dies are relatively adjustable for variously sized work, a boss formed upon each of said carriers and forming a said boss and sustainlng its die against out- 1n the thread. cutting opergitudinally spaced recesses therein, and means engaging in said recessesland against said boss for determining the proper position of said screw for threading work of said last named means a predetermined size,

to lock said screw binding against said boss BRADFORD BORDEN.

a screw working in against out-1

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