US1059453A - Tap. - Google Patents

Description

P. J. GREBEL.

TAP.

APPLICATION TILED AUG. 28. 1911.

1,059,453. Patented Apr. 22, 1913.

3 SHEETS-SHEET 1.

COLUMBIA PLANOGIAPH ICO.,\VASNINOTON, D.

P. J. GRBBEL.

TAP.

APPLICATION FILED AUG. 28, 1911.

059 453; Patented Apr. 22, 1913.

3 SHEETS-SHEET 2.

jzzfenzar P. J. GREBEL.

TAP.

APPLICATION FILED we. as, 1911.

Patented Apr. 22, 1913.

3 SHEETS-SHEET 3.

aity is v TED l STATES PATENT OFFICE l PAUL J. GREBELI OF CHICAGO, lILLINOIS.

TAP.

To all whom it may concern: a

, Be it known that LtPAULxJL GREBEL, a citizenof the United States, residing at Chicago county of coolnfitate of Illinois, have invented a certain :new and useful Improve mentinTaps, and declare it the followlng to lied to the particular number of parts in be a full, clear, and exact description of the same, such as will enable jot-hers skilled in the art to which it pertains to make \anduse i the same, reference being bad Itothe accompanying drawings, which a form at part of this specification: p

The primary object of myinvention is to produce a simple: and efficient collapsible ta l l it further object of my invention is to produce a tap which may be nicely adjusted to takeup wear and whichjmay be sharpened without changing its effective diameter.

A further object iOf myinvention is to produce a collapsible tap which,:in working, acts the same as a one-piece tap.

A further object 10f my invention :isto produce a collapsible tap device in which the tap will be automatieally collapsed after the desired number of threads have been cut.

The various features of :novelty whereby my invention is characterized will hereinafter be pointed aout with particularity in the claims; but, for a full understanding of my inventiomand of its various objects, includingthose heretofore enumerated, among others, reference may be had to the follow-i ing detailed description taken: in connection with the accompanying drawings, wherein:

Figure 1 is a to plan view of adevice arranged in accorc ance withfla preferred form ofmy inventionyFig. 21 is a;central vertical section taken :through the longitudinal axis of the device shown 1n;F1g. 1;

3 is a view looking toward the right 1T1 Figs. 1 and 2; Figs. 4, 5,6 and 7 are respectively sections on lines l- 4:, 55, 66, and 77 ,0f Fig; 2; Fig. 8 is a View of the device partly in plan and partly in section;

Fig. ;9 is a plan view of one end of the de-;

viceywith a portion of ;the1casing1broken away; Fig. 10 is aviewsimdan to Fig. 3 showing a different position oflthe parts;

and Fighll is a detail showing the connection of one of the chasers ortap members with the adj usting 1 member.

Specification of Letters Patent.

Applicationifiled August 28, 1911. Serial No. 646,391.

Patented Apr. 22, 1913.

Inthe drawings I have illustrated my invention 13S embodiedin a device having three-part tap and, for the sake of brevlty,

I shall confine the a detailed description to thissingle embodiment; but itwill of course be understood that my invention is not lim:

the tap any more than it} is to certaln other structural details which 11 have illustratedr upof a series of cylindrical bars lying side by side in engagement with, each other and having rolling contact on each other. In this way ithe several bars mutually support each other throughoutthe length of: the tap and therefore givleto the tap substantially the stiffness and rigidity of a singlesolid member. a A piece is cut away at one end of each of the bars so asto provide aniedge in whichithecutting teeth may be formed. It :is evident thatby rolling t-he bars :upon each other; each about its ow ntaxis, the radial. distance fromthe axis of thetap to the cutting edges is variedl I make use of this principleto secure accurate adjustment of the tap so as to obtain just the desired diameter :and also for the purpose of collapsing the tap so as to permit it to be withdrawn from the tapped opening by a direct axial movement; it being seen that if lthe rotation of eachof the bars is great enough, thecutting teeth will be drawn so far toward the centerof the tap that they will clear the threadswhich have been out thereby in the work.

by sidein engagementwith each other. Sections are cut away at the sides of the bars atcorresponding ends as indicatediat:

2.1 This produces cuttinged es as indicated at 8, and in these cutting ec ges areformed a the teeth 4.- of the tap. The several bars are heldin proper relation to each other within a suitable casing 5 which has preferably an elongated neck (S at one end thereof for :the purpose of givlng a bearing surface of considerable length. a The 1 bearing opening 17 through the neclr preferably takesjust the shape of the cross SBCtlOIlzOf the assembled bars, thereby causingthe proper relation beq tween the bars to be maintained at all times.

Eachlof the barsis provided with a hook8 at the end opposite that having the teeth,

llO

. this arrangement necessitates the withdrawal.

the several hooks being adapted to engage with a head 9 on the end of an adjusting stem 10; the parts being so proportioned that when the three bars and the adjusting stemare assembled together with the several hooks hooked over the head. of the adjusting stem, relative axial movements between the severalparts is prevented but. each part is free to rotate about its, own'axisb- The elements whichI have heretofore de-- scribed areso proportioned thatthe cutting ends of the several bars project out beyond the neck of the casing when .thebars are assembled in the casing; with the adjusting memberiextending out through the back of the casing. The adjusting memberpreferably extends through an elongated neck 11 which forms the shankby which the tool is held, the outer end of the stem being screw- .threaded as at-12 so as to permit it to be screwed in and out for thepurpose of varying the extent to whichthe tap projects he yondthe casing. After the desired longitudinal adj ustment has been obtained the ad.

integral head provided with the neck 6, the

other end of the casing being open andbeing closed when the parts are assembled by means i of the shank 11 which is screwthreaded into the open end of the casing as indicated at 14. As will hereafter appear,

of the members of the tap through the rear of the casing. If desired, however, the neck 6 may .be bushed, the bearing opening 7 being arranged in the bushingand the diam:

A eter of the bushing being great enough to permit the withdrawal of the tap members with the bushing. Such a bushing will also have .t e advantage of being a replaceable member for which;,a new one may be substituted whenever the bearing becomes worn.

Surrounding the tap at a point within the casing is a heavy collar 15 which is free to rotate through a limited angle about the axis of the tap and has also a limited movement in the longitudinal direction. As will" be seen most clearly from Figs. 2 and 7, the member 15 is provided with a series of in ternal'longitudinal grooves or channels 16 corresponding in number with the number of bars in the tap. Each of the bars. has a rounded lug 17 which extends into one of the grooves or channels in the-surrounding collar; This arrangement permits the collar to :be moved in the longitudinal direction'withagain in its adjusted position.

out disturbing thetap elements but if the collar is rotated each of the tap elements will be swung: about its own axis. It will thus be seen that -by-turning the collarinone-direction or the other the cutting teeth on the tap will be moved in or out depending upon the 1 direction in 'which the collar is turned; this manipulation of the collar serving to bring the .tapfromja working position toea collapsed positionand vice versa.

In the front face of thelcollar is a shallow segmental notch 18' largefenough to receive loosely a segmental block;19 rigidly secured within the casing directlyin front of thecola lar. It will'be seen that whenthe collari is turned so i as I to bring the notch opposite .the. block 'l8and is then pushed forward so that the blockisreceived in the notch',tthe col lockedagainst rotarymovements, this being lar and consequently the tap elements are 1 thecondltion 1n whlchthe parts are placed during the cutting operation. After aholer has been tapped the collar isslidback and tap and permit its withdrawal "from the tapped opening. It is not necessary that the i isthen free-to be turned so as to collapse the block fit snugly into the notch because the. v tap turns only in one direction during the cutting process and therefore,,ifythere' is a slight lost motion between the block and the collar, this will be taken up-at, the beginning of the cutting process and the'tap elements will thereafter be, rigidly held. I make use of the block 19 to adjust the diameter of the i tap within limits d'ependingupon the size;

of the tool. It willbe seen that byshifting the angular position ,of the block in one direction, the collar will be brought to rest with the cutting teeth of the tap a little closer to thecenter ofthe-tap than before the tap is reduced. By shift-ing theblock 1 angularly in the opposite direction the. turni ing of the collar and'of the taplelements is r not arrested until the cutting edges have traveled outward away from the center of the tap so that the effective diameter of the tap is greater than it :was before." The ad-.

justment of the block 19 may conveniently be effected .by securing; theeblock in place by means of a stud 20 which passes through an elongated slot 21. in the casing. By loosening the stud,flor a nut thereointhe block may be shifted angularly within the limits of the slot, andmay then be locked In the arrangement shown the stud is provided with a nut 22 on its outer end and a curved washer 23 is placed between-the casing and thenuu The washer may be provided with a suitable index 24 which cooperates with a graduated scale 25 on the casing,; thereby enabling the workman to set the block rapidly and accurately. The collar maybe moved both angularly and longitudinally by means of a,

1 05 and consequently the effectlve diameter of suitable handle 26 secured lthe'reto i and projectingupwardly outof the casing through an elongated slot 27 which{ is alsoowide enough to permit a limited movement of the handle longitudinally of 1 the casing. 1 By means of the handle the tap elements maybe turned in either direction landmay be locked together in the, manner heretofore explained.

It is desirable that devicesof this kind shall be more or less automatic, thereby de-,

creasing the time required to tap an;opening and leaving the workman as freeas possible to give his attention elsewhere. To this, end I have vprovided means whereby the, tap will beautomatically collapsed when-1 ever, a predetermined; number of threads have been cut in a piece of work, the tap being againyplaced in its cutting; condition and locked there upon a simple manipula-i tion by the workman of the handle 26. In

1 the arrangement shown thereiis placed bee hind the collar 15 a coiled spring 28 one end of which bears against a stop 29 :fixed to the casing and the ,other end of which bears against a pm or stopz 30 projectingean; wardly from, the: collar.: The spring ;is

made long enough so that when placed in position it isunder anfinitial tension and the stops are so located that the tension of; the spring 1s1exerted in :thedirection to collapse the tap. A second springy31is placed betweenthe collar and theirear :end

of the casing, this springbeing also under an initial tension and tending simply to push the collar forward, Slidablymounted on the neck 6 of the casing is a follower 22 which has an inwardly extending flange 33 extending into proximity to the tap. Normally the flange33 is at some ZCllStELIlCG in front of the front endflof the=neck so that the follower as a whole may be moved :back a limited distance. Projecting back from the follower, preferably at diametrically cap-v posed points are pins 34 lWhlOh extend through the front wall gQf the casing and engage with the front face of the ring or collar 15. The movement of the follower is sufficient to permit the pins, when the follower is pushedbaclgto force the collar away from the stop block, leaving the collar free to turn. As soon asthe collar is free from the blockthespring28 expands and rotates the collar as.far:as it willi go, thus collapsing the tap. \Vhen the pressure upon the follower is removed the spring 31 moves the collar forward until its front-face strikes the block19. However, the: notch: in the collar no longer registers with the block and therefore the collar and the block are not interlocked withieachother. To replace the tap in working, condition itis, only necessary for the workman to swing the handle 26 from the position indicated in Fig. 10 toward or past the positiongindicated in Fig; 3, this bringingmthe notch into registration:

forward.

with the block and the spring;311 thereupon forcing-the collar forward far enough to seat the block into the notch and thus lock thetelements of the tap in their workingi position. It will, of coursebe understood 1 1 that the tap is adjusted by means of the ,ad-

justing stem so that it projects just far 1 enough beyond the flange of the follower to cause the follower to be engaged by the work and forced back so as to collapse the tap just as the tappingof the ,holeain the work is completed. It i will thus be seen 1 that the tap automatically disengages itself i from the work atthe end of the tapping operation and is held in its collapsed condition 1 until the workman pulls upon the handle 26., In this way thcre is no danger that the tap will becomereengaged with the work after it has once been disengaged therefrom and consequentlythe tap maybe drawn out of the work or the work drawn away from the tap without paying any further attention to the tap. Similarly afterthe workman pulls, the handlefor the purpose of expanding the tap again, he is not required to pay any 1 further attention to thetap because it is automatically locked and staysin the locked conditionuntil it is released automatically through itheoperation of the follower or,

manually byla backward pull upon the a handle 26. a

It will thus beseen that I have provided a simple and eflicient ,collapsibletap; which\ is almost wholly automatic in. its action;:;

which obviates the necessityof jnnscrewing 1 0 the work from the tap; {tIlClWlllCll permltsa the tap to be adjusted accuratelyto take up wear-.1, It will furthermore be seen that I have provided means whereby the number a of; threads to be cut may be varied quickly 1 5 ing movement of the cutting teeth as the 1 tap is collapsed and I have found that this, 1

effectually removes the dust- ,and keeps the tap clean; The cutting, edges on thetap elements or chasers may be made as long as is desiredso that whenever it is necessary tosharpen the tap a little can be ground: olf the end thereof and the whole tap maytheni be pushed forward a distance equal to the depth of the portion ground ofl. Thus the effective diameter of the tap is not decreased i but instead a sharp cuttingedge is formed a at the end of the tap and an entirely new tooth :or part of a tooth isbrought out into the cutting 120116 by bodily shifting the tap for supporting said members in rolling contact with each other, correspondingends of saidmembers projecting from said casing and having cutting edges thereon, means for locking said members agalnst relative rotarymovements with the cutting edges inv cutting positions, and means for rolling said members on each other when in unlocked condition so as to swing sa d cutting edges 'inwardlyutoward the axis of thetap.

2. In a device of t-hecharacter described, a tap comprising a plurality of cylindrical members, a casing having bearings therein for supporting said members in rolling contact with each other, corresponding ends of said members projecting from said casing and having cutting edges thereon, means for lockingsaid members against relative rotary movements with the cutting edges in cutting positions, a work-engaged part cooperating with said means to unlock said members, and means for rolling said memhere on each other when in unlocked condition so as to swing said cutting edges inwardly toward the axis of the tap.

3. In a device of the character described, a casing, a tap divided longitudinally into a plurality of members each supported in said casing so as to be revoluble about an axisparallel with the axis of the tap and slidable longitudinally, one endof the tap projecting beyond the casing and having cut-ting edges thereon,.a member carried by the casing and adjustable in the direction of the axis of said tap, a connection between the latter member and the members of the tap holding them against relative long tudinal movement and permitting relative turning.movements,

and means. for turning the members of the tap relative to each other so as to bring the cutting edges into working. positions or carry them inwardly toward the axis of the tap into inoperative positions.

4.- In a device of the character described,

a casing, a tap mounted in the casing and projecting therefrom at one end, said tap.

comprising a plurality of cylindrical memberslying side by side in engagement with.

each other, means for holding the members of vthe tap against longitudinal movement, a collar surrounding said tap at a point within the casing, said collar having aflimited turning movement about the axis of the tap and a limited movementlongitudinally of the tap, cooperating shoulders on the collar and on the casing arranged to be interlocked L with each other upon alongitudinal mov'e' ment of the collar, a springfltending normally to hold the collar in the position in which said shoulders are interlocked, a

spring tending normally torotate said @01- lar, said collar being provided with a pluralityof internal longitudinal grooves orl recesses, lugs on the members'of the'tap projecting into and having a sliding fit in said grooves or recesses, and awork-engaged part" cooperating with said collar to move it lon-. I

gitudinally far enoughto bring said shoulders out of engagementwith each other,

5.'-In a device of the character described, a casing, a tap comprising a series of Cylll'l;

drical members lying side'by side in'engager ment with each other and reach revolubly supported in said casing, one endof each of said members projectingbeyond the casing and having; cutting edges thereon, a

member carried'by the casing and adjustable in the direction of the axis of said tap, a

connection between the lattermember and, the members of the tap holdingthem against relative longitudinal movement and permittingrelative turning movements, and means for rolling the members of the tap upon each other so as to bring the cutting edges into" working positions or carry them inwardly" into inoperative positions. I

6. In a device of the character described, a casing, 'a tap mounted in the casing, and

projecting therefrom at, one end,said tap comprising a plurality of cylindrical members lyingside by side inengagement with each other, means for holding the members 3 of the tap against longitudinal movement, a collar surrounding said tap at a point within the casing, said collar having a limited movement longitudinally of the tap, co operating shoulders onthe' collar and onthe J casing arranged to be interlocked witheach other upon a longitudinal movement ofthe collar, said collar being provided with a plurality vof longitudinal grooves or recesses, lugs on the members of the tapprojecting into and having a sliding fit in said grooves or recesses, and means for actuating said 1 collar. I I

7. In a device of the character described,

a tap comprising a plurality of cylindrical members lying side by side in engagement with each other, a casing'surroundingfone end of said members and havmgbearings olubly incontact with each other, the other end of said members having cutting edges. v

8. A tap comprising a series of cylindrical members lying side by side in engagement with each other and'having cutting edges therein for maintaining said members revon correspcndin gends, :and means for hold? responding ends of said cylindrical members 1 ing said members in revoluble engagement being provided with cutting edges. 10 with each other. i In testimony whereof, I sign this speci- 9. A tap comprising: a member having a ficaticnd in the presence of two Witnesses. 5 cylindrical bore therethrough andia plurality PAUL J. GREBEL.

of cylindrical: members lying Within said Witnesses: bore and each making; contact with ;the W'ih F. FREUDENREICH, others and WithZthe Wall 101: the bore,z cor- RUBY 1V. BRYDGES.

Copies of this patentmay be: obtained for :flvecentseach, by addressing the: "Commissioner of Patents,

Washington, D. O. i

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