US1868750A - Reversible die head - Google Patents

Description

July 26, 1932.

w. JENKINS REVERSIBLE DIE HEAD Filed Jan. 15, 1950 2 Sheets-Sheet l y 1932- w. A. JENKINS I 1,363,750 I REVERSIBLE DIE HEAD Filed Jan. 15. 1930 I 2 Sheets-Sheet 2 J 5 g .Q.

2 30 i (I $1 22 I ll 1 31 E I 1 l 2 36 Y 8 20 29 E (A? 5Z5 21 22 1O Patented July 26, 1932 unites stares Parent easier f REVERSIBLE DIE HEAD Application filed January 15, 1830. Serial No. 420,895.

. simple, practical and inexpensive die head upon which is mounted a series of thread cutting dies or chasers and the latter belng mounted on reversible base blocks in order that the same head may be conveniently em ployed for cutting right or left hand threads on a pipe, rod or the like.

The subject matter herein described and claimed is an improvement on the thread cutting die forming the subject matter of U. S. Letters Patent No. 1,652,67 3 issued to me December 18th, 1927.

Further objects of my invention are, to generally improve upon and simplify the constrnction of the existing forms of thread 1 cutting dies, further, to provide simple and eflicient means for simultaneously moving the sliding die carrying blocks or bases radially in both directions relative to the pipe, rod or other member upon which a thread is being cut, further to provide simple and eificient means for very securely and rigidly fastenin g the cutting dies or chasers upon the sliding base blocks and further, to provide a convenient light weight and eiiicient thread cutting die that may be used as a hand stock or in a thread cutting machine.

With the foregoing and other objects in View, my invention consists in certain novel features of construction and. arrangement of 1 parts that will hereinafter be more fully described and claimed and illustrated in the accompanying drawings, in which:

Fig. 1 is a view looking against the front face of a die stock embodying the principles of my invention.

Fig. 2 is a side elevational view of the die stock.

Fig. 3 is an elevational View of the rear side of a portion of the body of .the stock and showing the rear faces of the radially moveable die carrying base blocks.

Fig. 4; is an elevational view looking against the front face of the base plate of the stock.

Fig. 5 is an enlarged cross sectional View taken approximately on the line 55 of Fig. 1. v

Fig. 6 is a detail cross section taken on the line 66 of Fig. 1. n

Fig. 7 is an elevational sectional View taken on the line 77 of Fig. 5.

F ig. 8 is a front elevational View of the sliding base block adjusting ring.

Fig. 9 is a side elevational view of the adjusting ring.

Fig. 10 is a diagrammatic View illustrating the relative positions of the die cutters or chasers when properly assembled on. the body of the stock and which cutters are slightly oifset relative to each other in order to cut threads of the desired pitch.

Referring by numerals to the accompanying drawings which illustrate a practical embodiment of my invention 1O designates a disc in the center of which is formed an opening 11, and projecting rearwardly from said disc around said opening is a short tubular member 12 that may be mounted in a suitable chuck or support 13 when the stock is utilized in connection with a machine.

Formed integral with and projecting outwardly from the edge of the disc 10 are oppositely arranged sockets 14 that receive handles 15 when the die cutter is used as a hand stock.

Formed through the body of disc 10 are concentric arcuate slots 16 that'are disposed at diametrically opposite points and preferably at right angles tothe sockets 14.

Arranged on the front side of the disc 10 which functions as a housing 17 that is secured to face plate 10 by screws 18 and formed in the outer portion of this housing and extending from the opening 19 in the center thereof to the outer edge of said housing are grooves or channels 20 that are undercut or dove-tailed in cross section, thereby forming radially disposed ways for the base blocks 21 that carry the cutters or Chasers. These base blocks 21 are shaped so as to correspond with the shape of the ways 20 and formed on the rear or in, ner face of each block is a pair of grooves 22. These grooves are slightly curved lengthwise and one groove of each pair curves in face plate is a ring vided with a plurality of longitudinally the opposite direction from the other groove of said pair. 'Both grooves extend across the rear face of the block in a direction that is slightly inclined with respect to the axis or longitudinal center line of the bloclr. T he members of each pair of grooves occupy positions equi-distant from the ends of the block. Arranged between the face plate 10 and the housing 17 is a block adjusting ring provided adjacent to its central opening 24: at short tangential lugs 25 that are adapted to engage in the grooves in the blochs21;

Projecting rearwardly from' ring 23, through the slots 6, are threaded pins or studs 26 and mounted on the outer portions of these studs and bearing against the rear side of face plate 10 are winged nuts 27, thereby providing means for looking the ring 23 to the face plate after adjustment.

As illustrated in the drawings I prefer to.

use four or more of the blocks 21 and in order that the cutters or chasers'that are mounted on said blocks shall properly er age the pipe or red upon which the thread is being cut and impart the proper pitch to said thread it is necessary to arrange the cutters or chasers at different distances away from the face of housing 17 and further, that the cutters or Chasers be mounted so that their axes are slightly inclined with respect to the axis of the die head. r

In order to provide the proper mounting for the cutters or chasers the thickness of the blocks is increased progressively or in succession as illustrated in Fig. 10 and projecting outwardly from the outer face of each block is a stud 28 that is slightly inclined with respect to the face of housing 1'? and which latter occupies a plane at right angles to the axis of the tool. Each stud 28 is areisposed slits 29 that intersect each other the outer faceof the outer portion of each stud is provided with longitudinally disposed corrugations 30. V V

Mounted on each stud is a thread cutter or chaser 31 and a portion of the periphery of eachcutter' is removed to form an areuate notch or recess 32, and thecorner 33 between the shoulders at the ends of this notch or recess and the threaded periphery of the cutter or chaser 31 constitutes the thread cutting edges of said cutter.

Formed inthe outer face of the body of the cutter 31, around the opening therein, is a recess 34, the bottom of which is inclined with respect to. the flat parallel faces of the cutter and positioned in said recess is a split ring 35 having a corrugated inner face that is adapt ed to engage the corrugated face on stud The rear face of ring 35 is inclined to corre spond with the inclination of the bottom of recess 34 and thus when the ring is posinoes and a tioned in the recess and retained therein between head 36 of a tapered screw 37 that is screw-seated in the stud 28 said ring 35 and the cutter 31 cannot rotate upon the stud.

The threaded bore for the reception of the tapered screw 37 extends axially through the stud 28 and as said screw is screwed into the bore in said stud the portions that are separated by the splits 29 will be moved radially outward sons to firmly grip the cutter positioned on said stud and at the same time the corrugations 30 on the stud will engage the corrugations on the inner face of ring 35 thereby locking the latter in position and as said ring is thicker on one side "than on the other and the recess3l in the cutter is shaped to receive said ring the latter and the cutter will be very securely held in position on the stud when the screw is tightened therein.

Formed on the outer face of ring 35 an the corresponding face of the cutter 31 are marks 38 which may be a proper setting of thec'utter and tapered ring upon the stud.

Ring 23 is firmly'secured by tightening the winged nuts 27 and the en'- gagenient of the lugs 25 in certain of the slots 22 in blocks 23 firmly hold said blocks against radial movement and the cutters or chasers 31 are locked to the studs 28 that project from the blocks 21 by the screws 37.

lVhen properly assembled and adjusted the tool may be used as a h and stock or on a machine for cutting threads on a pipe, rod or the like and during operation the cutting edges engage the pipe or red and cut a utilized in effecting thread thereon... The proper pitch for the thread is accomplished by arranging the cutters so that they are slightly offset in succession, as illustrated diagrammatically in Fig. 10 and by mounting said cutting discs so that their axes are slightly inclined rela tive to the axis of the tool.

Afterthe parts of thc'teol are properly assembled, the blocks 21 carrying the cutters or chasers 31 maybe simultaneously and corrergondingly moved inward or outward by rotation of the ring 23 and as said ring is rotated'the lugs 25 slots 22 will impart radial movement to the die carrying blocks and after proper adjustment the adjusting ring is locked by tightening the winged nuts 27 or studs 26.

V V The cutters or chasers 31 after being properly adjusted on the slotted portions of the studs 28 are rigidly secured to said studs by means of the tapered rings or washers 35 that occupy the recesses 3d and by the tapered bolts 37 that are screwed into the slotted studs.

The formation of the notches or recesses 32 cutting edges.

engaging one set of the By providing the blocks 21 with the pairs of grooves 22 and reversely arranging the members of each pair of grooves, provision is made for the reversal of said blocks, and as a result the same tool may be utilized for cutting both right and left hand threads.

To reverse the blocks it is only necessary to rotate adjusting ring 23 so that the lugs 25 are disengaged from the cutter carrying blocks and the latter may now be withdrawn from the ways 20 and after being reversed are reinserted in said ways and ring 23 is now rotated to engage in the corresponding set of grooves 22 so as to adjust the cutter carrying blocks radially relative to the opening in the tool that receives the work.

Thus it will be seen that I have provided a thread cutting die head or stock that is relatively simple in construction, inexpensive of manufacture, capable of being used as a hand stock or in a machine and which head or stock is provided with cutting dies or chasers which, in addition to being easily and quickly adjusted, may be readily reversed so as to enable the tool to be utilized for cutting both right and left hand threads.

It will be understood that minor changes in the size, form and construction of the various parts of my improved thread cutting die stock may be made and substituted for those herein shown and described without departing from the spirit of my invention, the scope of which is set forth in the appended claims.

I claim as my invention:

1. In a thread cutting die stock, a face plate, a member secured thereto, which member is provided with radial grooves, blocks arranged for sliding movement in said grooves, thread cutting dies carried by said blocks said blocks being reversibly mounted in their grooves so that the cutting dies carried thereby may be used for cutting left or right hand threads, grooves formed in the rear faces of said blocks, an adjusting ring arranged for rotation on the face plate to the rear of said blocks and lugs projecting from said adjusting ring into the grooves in said blocks. 7

2. In a thread cutting die stock, a face plate, a member secured thereto, which member is provided with radial grooves, blocks arranged for sliding movement in said grooves, thread cutting dies carried by said blocks which blocks are reversibly arranged in their grooves so that the cutting dies carried by said blocks may be used for cutting right or left hand threads, grooves formed in the rear faces of said blocks, an adjusting ring arranged for rotation on the face plate to the rear of said blocks, lugs projecting from said adjusting ring into the grooves in said blocks and means for rotating said ring and for securing the same to the face plate .after rotation.

for sliding movement in said ways, threadcutting dies detachably secured to said blocks said blocks being reversibly arranged in their" ways whereby the cutting dies carried by said blocks may be used for cutting left or right-hand threads, each block being provided in its rear face with a pair of reversely arranged grooves, an adjusting ring arranged on the face plate and lugs projecting from said face plate into certain of the grooves in said blocks.

4:. In athread cutting die stock, a face plate, a member secured thereto and provided with radially disposed ways, blocks arranged for sliding movement in said ways, thread cutting dies detachably secured to said blockssaid blocks being reversibly arranged in their ways whereby the cutting dies carried by said blocks may be used for cutting left or right hand threads, each block being provided in its rear face with a pair of reversely arranged grooves, an adjusting ring arranged on the face plate, lugs projecting from said face plate into certain of the grooves in said blocks and meansfor rotating said adjusting ring and securing the same to the face plate after adjustment.

5, In a thread cutting die stock, a. face plate, a plurality of reversible blocks mounted for radial sliding movement upon said face -plate,'studs projecting from said blocks, said studs being longitudinally slotted and provided withthreaded recesses the axes of which studs are inclinedwith respect to the axis of the die stock, thread cutting dies mounted on said studs and tapered screws seated in the threaded recesses of said slotted studs.

6. In a thread cutting 'die stock, a face plate, a plurality of reversible blocks mounted for radial sliding movement upon said face plate, studs projecting from said blocks, said studs being longitudinally slotted and provided with threaded recesses the axes of which studs are inclined with respect to the axis of the die stock, thread cutting dies mounted on saidstuds, tapered screws seated in the threaded recesses of said slotted studs and tapered washers seated in recesses in the outer faces of said thread cutting dies beneath the heads of said screws.

7 7 In a thread cutting die stock, a block, a slotted stud projecting therefrom the axis-of which stud is inclined with respect to the axis of the die stock, said stud being with a threaded recess, a thread cutting die mounted on said stud and provided inits outer face with a recess that is'deeper on one sidethan the other, a split ring occupying said recess and a headed tapered screw seated in the threaded recess in said stud with the head of said screw overlying said split ring.

provided i 8. In a thread cutt" die stock, a block, a slotted stud projecting therefrom the axis of which stud is inclined with respect to the axis of the die stock, said'stud being provided with a threaded recess, a thread cutting die mounted on said stud and provided in its outer face wita a recess that is deeper on one side than the other, a split ring occupying said recess, a headed tapered screw seated in the threaded recess in said stud with the head of said screw overlying said split ring and which split ring and slotted stud are provided with interengaging corrugated faces.

9. In a thread cutting die stock, a face plate, a plurality of reversible blocks mounted fol-radial adjustment upon said face plate, an inclined stud projecting outwardly from each block, circular thread cutting die mounted on each stud, the periphery of which die is notched to provide an oppositely arranged pair'of cutting edges, a washer seated in a recess in the outer face of each cutting die and surrounding the outer portion of said stud, said washer and stud having interengaging teeth and means seated in the stud for retaining the washer in the recess in said cutting die.

10. in a thread cutting die stock, a face plate, a plurality of reversible blocks mounted for radial adjustment upon said face plate, an inclined stud projecting outwardly from each block, a circular thread cutting die mounted on each stud, the periphery of which die is notched to provide an oppositely arranged pair of cutting edges, a washer seat-ed in a recess in the outer face of each cutting die and surrounding the outer portion of said stud, said washer and stud having interengaging teeth, means seated in the stud for retaining the washer in the recess in said cutting die and the bottom of the recess in the die and the inner face of the washer being correspondingly inclined.

11. In a thread cutting die stock, the combinationwith a face plate, of a plurality of reversible blocks mounted for radial adjustment upon said face plate, means between the face plate and blocks for'adjusting the latter radially, an inclined stud projecting outwardly from each block, a double-edged thread cutting die mounted on said stud, there being a recess formed in the outer face of said die around the opening for the stud, a ring seated in said recess, the underface of which ring is inclined to correspond with the inclination of the bottom of the recess and interengaging teeth on said stud and ring.

12. In a thread cutting die stock, the combination with a face plate, of a plurality of reversible blocks mounted for radial adjustment upon said face plate, means between the face plate and blocks for adjusting the latter radially, an inclined stud projecting outwardly from each block, a double-edged thread cutting die mounted on said stud,

there being a recess formed in the outer face of said die around the opening for the stud, a ring seated in said recess,'the underface of which ring is inclined to correspond with the inclination of the bottom of the recess, interengaging teeth on said stud and ring and means seated in the stud for retaining said ring in'said recess.

In testimony whereof I'aflix my signature;

l VILLIAM A. JENKINS.

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