US1269468A - Die-head. - Google Patents

Description

W. AI LEONARD.

DIE HEAD.

APPLICATION FILED OCT. 3. 915.

I LQ69,%6, Pat JllllGl, 8.

SHEETS-SHEE l.

Illa-" ammo z W. A. LEONARD.

DIE HEAD. APPLICATION FILED OCT. 8. 91s.

Lfiwfifiu Patented June 1 s.

2 SHEETS-SHE DIE-HEAD.

Specification of Letters Patent. Patented Julie iljl, 191%..

Application filed October 8, 1915. Serial No. 54,807.

To all whom it may concern:

Be it known that I, WILBun A. LEONARD, a citizen of the United States, residing at Woodmont, in the county of New Haven and State of Connecticut, have invented new and useful Improvements in Die-Heads, of which the following is a specification.

My invention relates to die-heads for screw cutting and the like, and particularly to die-heads of that character employing radially adjustable dies movable into and out of threading position through the medium of a spring-retracted cam ring, which is automatically retracted at the limit of motion of the stock to move thedies out of engagement with the work at the end of the threading operation.

In die heads of this character it is ad vantageous as well as customary to have the cams at the front of the head, but this arrangement of the cams renders the cutting dies comparatively inaccessible, making it impossible to apply or remove the dies without dismantling the parts to a greater or less extent at the expenditure of considerable time and labor. In at least oneprior construction of device the dies are so disposed as to be readily accessible, but the ring carrying the cams is arranged in rear of the dies and between the same and the head of the stock, making the construction to some extent objectionable on account of an improper distribution of the cutting strains.

Theprimary object of my invention is to provide a die head embodying a novel dis tribution of parts whereby both the cam de vice and the dies are arranged at the front of the head so as to properly balance the parts and distribute the cutting strains, and wherein the dies. are also readily accesslble, the construction being such as to permit of the application and removal of the dles, as wellas the assemblage and disassemblage of the parts in genera in a ready and convenient manner.

The invention consists of the features of construction, combination and arrangement of parts herein fully described and claimed, reference being had to the accompanying drawings in which Figure 1 is a side elevat on, partially in longitudinal section, of a die-head embodying my invention, showing the dies in normal or retracted position.

Fig. 2 is a front elevation of the die-head.

Fig. 3 is a vertical longitudinal section through the head.

Fig. 4 is a view similar to Fig. 3 taken on a different vertical line.

Figs. 5, 6, 7, 8 and 9 are vertical transverse sections on the lines 55, 6-6, 7-7, 8 -8 and 99 of Fig. 1.

Referring to the drawings, 1 designates the stock comprising the sleeve 2 and head 3, which stock is mounted in practice by thesleeve 2 in a turret or holder which travels upon a suitable bed. The stock is held from rotation in its movement, but feeds longitudinally upon the bed until the limit of the threading operation is reached, at which time the movement of the stock is arrested by asuitable stop device, and the cutters are then thrown out of action to automatlcally stop the threading operation. As shown, the head 3 is recessed to receive the shank 4 of a die carrying head or member 5, which is provided in its outer or front face with guideways 6 for a series of radially movable cutters or dies 7 each having therein a groove or slot 8. Guide bolts 9 connect the member 5 with the stock, to hold the parts connected and to permit the member 5 to have a certain degree of longitudinal sliding motion with relation to the stock, coiled springs 10 being disposed about said bolts and serving to hold the member 5 normally retracted. Radial grooves or guideways 11 and 12 are provided in the meeting faces of the parts 3 and 5 and receive keys 13 which lock the member 5 against rotary motion on the stock, while permitting it to have the limited longitudinal sliding movements referred to.

Mounted for a limited rotary movement on the shank 4 is a setting ring 14 provided with an operating handle 15 and a locking slot or recess 16, which slot or recess is arranged in alinement with an elongated slot 17 in the head 3 and with a passage or opening 18 in an adjusting ring 19 mounted to turn or rotate upon the shank 4. At its lower portion the ring 19 is provided with a slot 20 into which projects a stop screw 21 carried by the shank 4 of the head 5, the engaging surfaces of the ring 19 and shank 4 being threaded for an adjustable engagement, as shown at 22. Screws 23 and 24 carried by the ring 19 are disposed on opposite sides of the slot 20 and adapted to be adjusted into and out of engagement with the screw 21, so that the ring 19 may be adjusted to adjust the dies for a definite cut, as hereinafter described. I A locking bolt 25 provided with a manipulating handle 26 is adapted to engage the keeper slot or recess 16 in the ring 14 and is movable through the slots 17 and 18 in the members 3 and 19, said bolt being normally held projected by a spring 26 to lock the parts 14: and 19 against relative rotation, said bolt also serving to limit the rotary movement of the ring 19 with respect to the member 3. Upon retracting the bolt 25, however, the ring 1 1 may be rotated by means of the handle 15, and when the ring 14; is moved slidably forward so as to withdraw the slot 16 from engagement with the bolt 25 said ring will also be free to have rotary movement. The ring 1& carries a cam ring 27 detachably secured thereto, as by means of screws 27 It will be understood that the adjusting ring permits, when said ring is released, of a rotary motion of the cam to a greater or less extent, determined by the position of the adjusting screws 23 and 24 with relation to the stop screw or member 21. Also it will be understood that the adjusting ring, which is adapted to turn with the cam ring and setting ring as a unit when the parts are free for rotation, is normally held from rotary movement and prevents such movement of the aforesaid parts as long as the locking bolt 25 is in engagement with the opening 18. It will also be understood that the slot or recess 16 permits of the normal setting movement of the cam ring, and that the parts are normally held in position against longitudinal separation by the bolts 9, springs 10 and keys 13.

In general practice the tool is mounted in a turret or other support, and this turret travels on a suitable bed whose traveling motion is limited by a desired type of stop device to determine the length of the screw thread to be cut. When the limit of motion of the turret is reached, the stock is held thereby from further forward motion, but the cutters continue the cutting motion on the material being threaded, which is rotateol, and in consequence the cam ring and parts connected therewith continue to move forward against the resistance of the springs 10, which are thereby tensioned, until the adjusting ring moves out of engagement with the lockingv bolt, whereupon the cam ring and setting ring are unlocked so asto permit the same to have rotary motion.

The cam ring forms a casing which incloses the dies and die carrying portion of the die carrying head or member 3, and this ring 27 is provided at its outer side with a detachable face plate 28, secured in position by screws 29, and which is preferably made removable so that access may be conveniently obtained to the internal parts for cleaning, oiling and other purposes. A

. and engages "the ring and die carrier head at its opposite ends, said spring being tensioned when the cam ring is adjusted to project the dies, for the subsequent automatic retraction of the dies. The plate 28, which is a fixed part of the cam ring, is provided with cam projections 31 which engage the grooves 8 in the dies7, whereby in the reverse rotations of the cam ring the dies are adjusted in and out. Formed in the cam ring are openings 32 through which the dies are adaptedto be removed when the cam ring is turned to an abnormal predetermined position and the cam projections are disengaged from the cam grooves.

Formed in the perlphery of the die carrier head is a groove or recess 33, the end walls of which form stops or abutments, and mounted upon the cam ring is a springprojected plunger 34chaving a finger piece 35, which plunger projects into said recess. The circumferential length of the recess 33 is such as to normally control the extent of rotation of the cam ring on the die carrier head, which is sufficient to project and retract the dies but no more, and in such adlimit of retractive motion of the cam ring and dies the cam retracting spring 30 still remainsto a certain degree tensioned. The

plunger 34, however, may bemanually retracted by means of the finger piece 35, allowing'the spring 30 ,to retract or move the cam ring back. a still farther or abnormal distance, by which operation the cam projections 31 are moved clear of the grooves 8 in the cams 7 and the openings32 in the cam ring brought into alinement'with the dies, allowing the latter to be removed therethrough in a readly and convenient manner.

It will be evident from the foregoing description that the construction is such as to adapt the cam ring to be mounted at the front, the dies thusbeing disposed between the stock andthe cam, by which an effective I balancing of the weights and the cutting strains secure an easy cutting action. Furthermore this arrangement adapts the cam to be applied and removed with facility, and also adapts the cutters to be readily and conveniently detached without the necessity of dismantling or taking the cutter head apart, the advantages of which will be manifest. a

I claim A die head of the character described comprising a stock, a head carried by said stock and having resiliently opposed longitudinal movement thereon, radially movable dies in said head, a cam ring engaging said dies and having a peripheral flange inclosing said head, a setting ring revoluble upon said head within said flange, an adjusting ring revolubly adjustable on said head, a spring pressed bolt extending through an elongated slot in said stock and through said adjusting ring and having its end engaged within a recess in said locking ring, and means for holding said adjusting ring in adjusted position, said means comprising a stud threaded into said head and extending within a slot in said adjusting ring, arranged alined screws in ring engaging said stud.

In testimony whereof I afiix my signature in presence of two Witnesses.

W'ILBUR A. LEONARD.

and oppositely 10 said adjusting Witnesses:

SARAH G. FARREN, ANNIE SANDS ANDERSON.

flames of thin patent may be obtained for five cents each, by addressing the "commissioner of mam,

Washington, D. Q. t

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