US1401954A - Attachment for lathes - Google Patents

Description

S. C. BLISS.

ATTACHMENT FOR LATHEs.

APPLICATION FILED NOV- 20 1 918.

1,401Q954. Patented Ja1 1.3,1922.

.4 TS-SHEET I.

amnwtoi S. C. BLISS.

ATTACHMENT FOR LATHES.

APPLICATION FILED NOV. 20. I918.

1,401,954, Patented Jan. 3,1922.

4 SHEETS-SHEET 2- awvewtoz filvewmadi lzlss 38M, Mo l/14mg I V S. C. BLISS.

ATTACHMENT FOR LATHES.

APPLICATION FILED NOV. 20, 1918.

1,401,954. Patented Jan. 3, 1922..

4 SHEETS-SHEET 3.

' a nwutoz b law 00a 63 3/1155 S. C. BLISS.

ATTACHMENT, FOR LATHES.

wmwto c fiery/00 .Blllss M atmneq Speciiicatien o1! p a F i t-t teenresume jpplicatioir filed Novic nber 2t, 1918. ise i'a -nq; 25333- 3;

I teeth: oftaps, cutters, -hobs, :mills,- etc.-,' 7 said attachment :beingjadaptedxto be; used": with lathes of standard type already in j service or tube-originally:built-invwithisamd -:It"h asi for; its objectto-accomplish a rapid and accurately; controlled 'movementofan external? or internal thread. chasing or other tool; and to effect same withxaiminimum of shock in that the novel construction permits of a greatly reduced weight of the parts, it a being understoodsthatthef control is effected by means of a camwhich,inaccerdancer with the present invention, is not of the :'usual peripheral type: employed for- :this work but is: a'-tface;cam. "zlt lwillvb'e appreciated that in apparatus -'of .this character tlief accuracy of thei work required precludesi the use of any cushioning device fbruabsorbinfg the shock resulting. ifrom' stopping of, the i-a idly moving too-1islidevin the proper position for chasing or relievir'ig and that thelack of any such cushioning device imposes heavy stressesin parts *of the meehanism. Moreover, the time available for the'movement from one radius of operation to another is so short that the movement required must be very rapid. A further object of the inven tion consists in providing a cam whose controlling surfaces may be readily machined to very accurate dimensions, and in so mounting the back face of the cam as to eliminate all bending strains of same and its carrying shaft, and to make possible the ready renewal of all surfaces subject to shock. This is attained by providing a large bearing area, not possible with the peripheral cams heretofore employed wherein contact in the action is substantially along a line and causes rapid wear. This latter action resulting in undue wear, and the fact that heavy parts are necessary and cause heavy shock due to impact of the said parts, are par- ,correspon ticularly iobjectionable features of the apparatus-asheretofore employed,- P1 ii .The nature of the-invention-will be best understoedwhen desciibed in 3 connection with the; accompanying tdravvings, illustrating the*invention -embodie'd in a device for chasing interrupted threads on 1 gun breech plugs,and'inWhiCh wwz-r-a; 11 f? e Fig 1- is front elevation Loff-thef active -portion 1 of--. a: lathe 'lwithsaid device adapted thGIQtQ;.-EiS Fig.= 2 isa plan thereofz 3 1, LF" g. 3 isia: section: taken 'oi-i the line 3 3,

2 lookingin the direction" ofthe" arrows. :F1g-.:'4 is a fragmentary transverse section taken 'oIr't-he line 3;" .7 FigI :5 is a diagrammatic view, illustrating theactioniofthe devicez FF? Fig; 6' 'sf'anien'd view-of a "breech"-plug. Similar? characters of {referenced'eslgn'ate Q ingparts 'througheut the 'several VIQWSi-H 1 Referring "t d the a g -1aattest the lathe'bed upon: which there iscaused to travel; either c autom atica'lly or me nuall y; the

.usualtarriage l lprbyided with, a cro'ss slide .11 ea salsa =12; i fAlongf the lathe;'pr eferebly-at the back which: is idesigiid 'to' -berotated "111 21113? si iit able manner from the head-stockspind'lef 16 of: the: latheg jas "for example-through 'intermediate gears :17 Between"i -the head=stock from the shaft 15 through bevel gears 25,

is a cam shaft 26 through whose rotation the controlling movement for the operations hereinafter referred to is obtained. To this end, the shaft 26' extends into the cross-slide 12; that 1s to say, a flanged sleeve 27, keyed to said shaft, is caused to rotate within a bushing 28 of the said cross feed slide. The i bushing 28 is provided with an outward flange 29 between which and the flange 30 of the sleeve 27 is mounted a face cam 31, the back "of which cam abuts the flange 29 and is freely. rotatable with respect thereto. The

cam is secured to and carried by the flange 30 so as to rotate, through sleeve 27, with Y The slide 12 the em Shem; Ii h s is'causedtd partake of-the' motie cam shaft-26, and at the sameti neellpws o the cross feed 0f 'tlie f s l id relatlvelfi' tm said camshaft. V

slide carries a suitable 'to0l36 designed to tatedp In addition;tozits lengitudinalzffeedy and erossifeedfimevements through slid -12 for this purpose, havingwalmeutwardttubular,

' v extension; 38 E intd whiehr pnej eets: a* retl'r 39 i i: bnaeket etl: extendingis upwagdlys from; slide 1 '12. Between the'headf42 of said tubule-Heir tensiqn; and? the inner; and 9t: 11nd; 39,-=which -,is pr.Qvided-? withkas-head ompist' 1m coil maintain abeut szimeglandydmiyentheiiehy; a bxosslslide mgun ingssaidssleey a. 1 mi; sleevewandg bfiiLIf-i the:

theltoolr slide 35.. isfeauseda toa be raipidlymnd accurately neciprqevted' toward? and away from i the; work F1118; im aecordenee: with; the; 7 design efiz ther calm 3:1 iwhosewface is foxzmed A to suit the charaeter;0i thwWdrkwinfihamh I This is efi'eetedgbywpzowiding the; smidajslide; Y 3543b itsunden simfeeemwithk as eam bleck iff engaging the face'h0fca1n'31 to thereby tz ol the inand-Out'. posit-iom ogf the;slide; 1 and: its t0o1f 36, -thno1ighgthe-notation Of the. cam and in; accordance with the; pesitiion at J the Wonk-:1 As: isxheiaein shewn, i theeam; a ets I to force the tool 36 owned the-w0rlm18 aind 'isi' retmtned by resilie t: means, the slide u35,

tetedthel-tebyr,

bysaid cam andcarried by said cross :'j "2. 111? pwc-u wemm character set wei sleevenbhut" same and driven thereby,"'a,

,Cros s] feed; slide, a biishing mounted within said slide about said cam sleeve and" within whinhesfihei lattls is; adapted. to rotate, said bushing being provided with a flange at its outer end, and 311 face; cam 'netained-tbetween thetfinsnges ofi seidvbushingi the} flange; of swida eamssleeve. end'driven ey said" sleeve H -eppamtuswof:they'lchenaeter set sleeve about." -'sarme;"'a1nd=1 ffdrlive'n thereby: a

eutemendgs andhi face eamyretained between thelflangeefisaaidr bixshingz and the flange ef' seidaeamsreeye, bea ri ng againstgtheaflange eafi theyfonmen ande oer-Itiedfbh the: flange: of the: tterr toifrofiatexwithi theecam-i sleeve;

suitmbly drivem camshaft;- a-fleng'ed' dresssi-feedllslide,r wzibushingirnounted within V 'bushing kbei-ng pnevided rwithga fiaingeeaflits 43.1;ln ap mm m he character set 45mm a suitablytdriwen eemisha tg mime em m eress 'feedgslidewithinwhich said eaml shaft 'ijsj'l etatably mbnntedy a tool slide ceil 'm 'b'y saiid" aeei carnites move thea said? tofoF slide mohnte Q, t l em ia e th si (1" saidncfio'ss fedi slid, avcalm byi said-i tool sliderandisaetueted ink enew; dihe'c'tiem." at bracket} secured :to; the icross feed slide; a; tubular memberf'eam'iedibjr said? te'o'lzsl ide-,i haqxiingeej rod extendingthere iseidfi:braekemrendra coil spring in h eutasaid rodwithimsaidi-tlibizlar 'meinlie ,vbneven d thereof bearing against: an ends: at saidzie andftheketheis"againstz an end of smidwtubu 50 V e r I i V n ,feflh. q;;su itebly driven camshaft, a flanged r eerries at its upperpo'rtibn the 12 ide.fi lwhiehm e m menable kright angles te themotibn of thi'lZrOSSSITdB i e V 12 in a manner welhunnlersteede Themed ceacta with the: Wonk ESgrasf thei'letteh is 1B0?

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