US1752915A - Thread-cutting device - Google Patents

Description

April l, 1930. T. M. LILI EBERG 1,752,915 K THREAD CUTTING DEVI CE Filed April 23, 1928 Patented Apr. '1,' 1930 UNITED STATES 1 `A1-1=1NT4 oFF-rcs f TIDEMAN MI. Il11212D1511BEEIBETr,V OF CHICAGO, ILLINOIS, ASSIGNOR TO'THE' NYE TOOL @c MA- CHINE WORKS,YO F CHICAGO, ILLINOIS, A CORPORATION 'OF AILLINOIS THREAD-CUTTING" DEVICE Application mea April 23,

My invention relates to thread-cutting devices of the type in which the thread-cutting elements are carried by a head having a portion forming a journal support for an oper- 5. ating member, suchas a'lever provi-ded with a ratchet cooperating with ratchet teeth on the head. Y Y

, One of my objectsis to provide a thread cuttingfdevice of the generaltype referred to and employing asthe thread cutting element a solid die block which, as .commonly constructed, contains an opening `therethrough into which the thread-cutters extend, the die block and holdinghead therefor 'of' which may be readily assembledand disassembled, as desired.

To provide a novel, simple and economical i construction of the type above referred to.`

To provide a construction of the type referred to, and employing a die block, which shall present the maximum of strength with the minimum amount ofmetal, and thedie block of which may be readily removed and replaced, or another substituted, as desired.

To provide a construction of the type referred to and employing a die block whereby a plurality of die blocks of different sizes assembled with holding heads, respectively, and having openings therethrough of the dersired sizes for cooperation with the particular sizes of die blocks used therewith may be interchangeably used with an operating member such as that above referred to and for journal support on the heads; and other ob- 5 jects as will be manifest from the following description.

Referring to the accompanying drawing Figure 1 is a view in side elevation of a thread cutting device constructed in accordance with my invention.

Figure 2 is a sectional view taken at theirregular 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. 2 and viewed in the direction of the arrow.

Figure 4 is a view like Fig. 2 of a modificay5 0 tion of the die block holding head; an-d 1928. sei-iai no. 272,110.

Figure 5, a similar view ofv another modification of the' die block holding head.

Referring to the particular construction shown, the device comprises V4a head 'represented at 6, one end thereof beingof reduced diameteras shown at7 and at which portion it is providedperipherally with ratchet teeth 8 the ortion7 formino a 'ournalsu ort for f 7 P e l PP an. operating member 9 shown as comprising a bar 10 connected with and extendlng outwardly from, a body member 11 'containing an aperture 12 therethrough at which it surrounds the j ournalling Vportion 7 of the head 6, Y the member ,11 being provided with a ratchet 13v provided with a'tooth lll at which `it engages the teethS on the,head'6, this f ratchet, which is springpressed toward the teeth 8 by a coil spring 15having a stem 16 projecting into a position'in vwhich it is accessible for retracting the ratchet 13 when desired, which feature is kin accordance with common practice. v v f The cutting elementof the device comprises a round die block 17 containing an opening 18 therethrough linto which the thread cutting portions 19 of the die block extend in accordance with common practice;

The die block 17 is positioned againstfthe outer face of the larger end 20 of the head 6 and is held in place thereon lby a ring 21 internally threaded at'one end as represented at 22 at whichit screws upon external threads 23 provided about fthefperiphery of the portionjorflange 2O ofthe head, the die block 17 being preferably f-interlocke'd v.with the head G11-to prevent Vrelative rotationfofthese parts, asl for exampleby k:means of pins 24 'l secured in the portionv 20 of the head 6 to extend 1engthwisethereofv with their protruding ends projecting into rearwardly opening recesses 25 in thedie block v17.j I The head 6contains an opening 26 extendlng entirely therethrough coincident with the longitudinal axis of thislhead, this opening being of slightly larger diameter thanv the diameter of the space bounded by the teethof the'cutting portions19 of the die block, the parts being so constructed, as shown that the opening 18 inthe die block extends lin alignment with the opening 26.

object in the thread cutting operation and at,

the same time, permit the object to forma support for the device at its ratchet toothed portion.

Referring to the particular construction of means shown in Figs. 1 and 2' for holding the die blockagainst thefaceof the head 6, the

ring `21`isf0rmed at its outer endwith an internal annular tapered surface27 which flares inwardly,the die block 17 in this instance being tapered ata similar angle toward its outer end as represented at 28. Thus as the ring 21 is screwed to place it firmly wedges the die block 17, in position against the head` The construction shown in Fig. 4 is` the Same as that shown in Fig. 2 except that the tapers on the,ring.21 and die block 17 and represented at 29 and 30, respectively, are steeper and shorter than in the case of the taperedsuraces 27 and 28 of Fig. 2.

The construction shown in Fig. 5 is the same as that; shownin Fig..2 except that in` stead of providing for the wedging of the die block` against the head by the action of the rng `21" the die block is held in position by means of the engagement of an inwardly extendingannular flange 31 atthe outer end of the ring against an annular shoulder 32 formed on theouter face of thev die block by peripherally recessing it as shown.

It will be understood that as to all of the forms of structures shown the die block may be readily removed fromthe head merely by unscrewing the ring and this die block, or a substitute therefor, readily secured in place on the head by replacing thering. i

Furthermore, and this applies particularly` tothe construction shown in Fig. `2the ring 21 b i having `surrounding engagement with the ieblock serves tol reenforce the peripheral walliof` thedie-block` and thus the latter maybe made much thinner than is possible where the die block is notso reenforced, which makes for durability of structure by the use of the minimum amount of metal.`

In 0f di erent` diameter be threaded by the device, a plurality ofjthe die-block-equipped heads: would be provided, each die block of'a different size and eachcooperating head with the diameter ofits opening 26 proportionately varied', these severaldie-equipped units, each ot' whichiwould-` present a journallingportion ot' thegsame external diameter for the operatingmember 9,being interchangeablewhere-` `by but one operatinglmember 973111266. be used ractice where it is desired that objects for the entire set of the die-equipped heads, it being understood that the die-equipped hea-d may be readilyremoved from the operating l handle upon withdrawing the ratchet from engagement with the teeth on the head.

Vhile I have illustrated and described certain particular embodiments'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 and the invention embodied in other forms without departing from the spirit of my invention. I

What I claim as new, and desire to secure by Letters Patent, is

A thread-cutting device comprising a head having a cylindrical portion, an outwardly extending flange at one end of said portion having peripheral screw threads, an operatingmeans journalled on said cylindrical portion and coacting therewith, a die block entirely exteriorly of said head having its base in contact with the outer side wall of said flange, whereby said operating member and die block are on opposite sides of the flange to aid in reinforcing the same, a ring surrounding said flange and screw threaded thereto, said ring extending outwardly beyond the flange and overlapping the die block whereby said flange and die block are both peripherally reinforced, said die-block having a tapered peripheral face, said ring also extendingfinwardly and having a tapered clamping face corresponding to and engaging the tapered face of the die-block to clamp the latter against theiiange, and a pin connection detachably holding the die-block against rotation. i

TIDEMAN M. LILLEBERG.

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