US1316535A - Lathe-eest - Google Patents

Description

0. 0. cums. LATHE REST. APPLICATION FILED lULYJh 191B.

.PatentedSept 16, 1919.

-2 SHEETS$HEET 1.

0. 0. CURTIS.

LATHE REST.

i v APPLICATION FILED JULY H, I918. 1,316,535. PatentedSeptlG, 1919.

2 SHEETSSHEET 2- Oscar 0. Z r llsi 0, mm PLANuomPu C(.-.. WAsmNurox. n: c.

UNITED STATES P TEN OFFICE.

:oscARo; omens, or FORT MADISON,- IowA, As sIGNoR TO CURTIS BROTHERsHA-NDLE COMPANY, OFIEOIIEMI'. MADISONyIOWA, A CORPORATION 'OF'SOUT-H DAKOTAA ATHE-REST."

Specification of Letters Patent.

Paten tedSept-16 -1919;

Be' it known that-I, OscAR-O. CURTIS, a-

use "the same."

The present invention relates to; improve-- merits in lathe rests, and although the inven= tion may;of course, be found applicable to various"d ifierent*types of lathes; the'same has been produced with i a view more par ticularly to its adaptation to the-Defiance automatic handle lathe manufactured by the Defiance Ma chine Works of 'De'fiance,

Ohio. *This Defiance machine is shown and Y described in United States "patent to William A. Kettenring, No 324,847; granted August 25, 1885, and in the=two=patents to Peter Kettenring No."378,3'22,' granted February 21, 1888; and No; 42%);924; granted 3 JunelO, 1890;reference to which-may "be hadfora more particularexplanation of the vibrating table shown in the accom panying drawings in connection with my present invention. a

In lathes "constructed in accordance with the above mentioned patents and in other lathes to which the present-invention is applicable,the stick is. operated upon through 1 out an extendedportion "of its length by a series-=of cutters which act simultaneously and cut the a stick uniformlymither" throughout its extended portion or at two points onsaid sti'ek'to which the improvedsteady rest and the steady rest guides ar'e to be appliedr" It is an-oloject of "my inventi0ntoprovide' for the suppont of the work at a relatively weak point-thereon,=for instance 'at point approximately midway of the lathe-*centers I Where the-work is subjected to the greatest vibration; due to the action of-"the cutting knives thereon; *To all-ow I such 1 vibration is to permit the work to escape fromthe knives or saws; with the result that the work is not properly turned. f i a a i It is another 1 ob ect 'of my present 1nventi'on 1 to enable" the long slender flGX lbl'Q sticks, out of which spokes; ax med t te;- the l k are/"made? to" be turned} snqjoothly and 3 quickly without undue "vibration; This I accoinplislifin the1113111161"llciciff after more fully described" in 'c'onnettioii with the accompanying drawings; in which it 'f'will "be understood 1 have shown 1 but a single" embodiment of which mydnvention is susceptible;

lathe; accompanying drawings forming a" part ofthis application, andfin which SlIl1l-' lai a reference symbols-- indicate correspond 1 in gfparts in the several' views g' Figure- 1 is "a plangview of a'n 'improi 'ed lathe rest constructed in accordance with the ares'ent invention? being shown mounted on t e carriage ofa Defiaiice lathe.

F ig. '2 is a rear -elevational View 'ofthe same; and i V Y a Fig: 3 is an end elevational view "with parts shown in se'ctionl A i Referring now -more particularly "to "the drawings, 1 designates the carriage oi a 1 Defiance automatic combined spoke" and handle lathe which is mounted to vibrate toward and from the 1 cutting knives or saws which are indicated at Q in Fi gJ8. --The workorstick is sliow1iat 3, and is held-in the usual 1 lathe centers,- one of "which is shown at 4 l11'Flg.'1. The woi'k or stick 3' is ='rotated by the live "center in the usual manner; and when {the carriage 1 is moved in aleft hand direction, as loo ked at in 3,-sai*d work or stick?) is brought into en gagement with' th'e cutters2; r

The stick-or work Sis shown'in Fig. 3 tobe 'supporte'dfrom beneath by an under work" holder 5 and at the side opposite the cutters' 2 by'ja' side' work holder 6. Theside'wvork holder 6 is' carri'ed by anarnr'i pivoted; as indicated "at Y 8, in ears' 9 on I a hanger 10 which carries a" set screw 11 forming an ad-' j usta'ble "stop forthe arm 'i; by whiclr the' side work holde'rfi may be made to assume any normal position" with respect to 3 the work 3. The arm" 7 carries a weight "12 Whichnormally ho1ds-th arm in the posilOQ- tioi'r sh'own in Fig." 3, with the"-side work holder 6 in 'con-tact'with the Work 3. A stop 13,- carried by the framework "of the lathe, "is mounted in" a position to *be engagc'd'by the weight 12. When the carriage 1 is moved to the right, as=shown injdotted lines in Fig. 3, the stop-13 arrests the unevearm 'Z, causingthe latter to be rocked on the will becarried to the right, with the result that the side work holder 6 is withdrawn from the work.

The hanger 10, above referred to, is slotted as indicated at 141 to adjustably receive a bolt 15 by which it may be fastened to the lathe carriage 1. The parts just described are so mounted on the carriage 1 as to bring the side work holder 6 at a weak ened or unsupported part of the work 3, for instance, substantially midway between the lathe centers. At such point the vi bration set up in the work 3 by the action of the cutters 2 striking the same, is the greatest, and it is here that the work escapes tothe greatest degree the action of the cutters, resulting in the irregular and uneven turning of the stick. The work holder 6 resists this tendency of the work to vibrate,

:as it supports thework at the side opposite that upon which the cutters 2 are operating.

Near the lathe center 1 I provide a side guide 16 which 1s mounted on an arm 17 slmilar to the arm 7 shown 111 F 1g. 3, and

.,;similarly mounted to oscillate on a hanger 18 adjustably carried by the table 1. There is a weight 19 also carried by the lower end of this guide arm 17, and a rod 20 asses through registering eyes in the wei-g its 12 :and 19; set screws-21 being employed to adjustably hold the ends of the rod 20 therein. By loosening the set-screws 21, the arms 7 and 17 together with their associated parts, may be moved farther apart or closer to one another. Through these connections it will be understood that the side work holder 6 is compelled to oscillate in unison withthe side guide'lG. Such side guide 16 is arranged to bear against a part of the stick 3 which is to be turned similar to that part against which the side work holder 6 engages; but the side guide 16 is disposed very close to one of the centers at where the work is supported, and where such work therefore is subject'to very slight, if any, vibration. Y

The said guide 16 will therefore be unaffected by any vibration of the stick and, as it governs the action of the said work holder 6, it will tightly hold the said work holder against an intermediate part of the work which is unsupported and has a tendency to vibrate greatly. Atthe same time, as-the same erosssection is to be given the stick 3 at both the points where the side work holdern6 and the side guide 16 engage, any particular pattern may be turned Without interference from these parts, as the same may oscillate back and forth about the 'ppivots 8, alwaysbearing effectually against the side of'the stick 3.

Referring now to the under work holder 5,

the sameis preferably mounted as close to the'side work holderb as practicable, and

.thisuund'er work holder 5 is also movably supported so that it may follow any particular outline or curvature given to the stick 3, and whereby it may also be depressed away from the stick 3 when the latter is to be removed from or inserted in the lathe centers. g

In the embodiment shown in the present drawings, the under work holder 5 is carried on and forms an offset of a round bar 22 slidingly fitted through an opening in a bearing block 23 and adjustably held therein by a-set screw2t. A- bracket25 carries a pivot 26 on'which the bearin block 23 is adapted'to rock; the bearing block 23 and bar 22 forming an oscillating support for the under work holder 5;

end-30 of the weighted arm 7 in a manner to be hereinafter described.

A coil spring- 31 is connected between the bearing block 23 and the bent over end of a post 32 adjustable vertically through the bracket 25 and secured in the desired position by a set screw 33. The function of the spring 31 is to'yieldingly hold the under work holder 5 against the work 3 and to allow the same to be depressed when required. The screw 3e threaded in the overhanging end 35 of thepost 36 forms an adjustable stop to limit the upward movement of the bar 22 when the stick 3 is removed from the lathe centers. At 37 is shown a setscrew whereby the post 36 may be vertically adjusted.

In the same way that the side guide 16 governs the movement of the side work holder 6, so the'action of the under work holder 5 iscontroll'ed-by anunder guide '38,

which is also made to contact with the under side of the stick 3 at a point thereon under guide 38 being also located as close as "practicable to the center et-or at other point along the stick wherethe same is-sup-- ported rigidly or is subject to very slight vibration. The under guide 38 may also be formed on the free end of a round bar 39 similarto the bar 22, which bar 39 is'adjustably mounted in an oscillating block 40- held on a bracket 4L1 carried by the carriage 1. This bracket may be adjustable as in the case of the bracket 25.

A'stop device 42, which maybe similar to thatabove described in connection with the dicated generally :at 4i3iis=provided -to yields ingly raise' the :block 40 bar 39- and iguidew- 38. Both: the blocks: 231 and: "are 'it'ormedfl with eyes t i and to receive lthe ends of" I l a rod 46 by-twhich'wthew same m ay the connected, sui-tabletset screws 47-iand*AS-beirigw provided to adjustably KSQGtliTB-s these-a parts The use of the invention may belexpla'inedwv as follows: a i

The lathevcarriage l is shownin fulhlinesthe cutting :Imives-QQ but before the work i r i 3 is insertedimthecenters atheaCaPria 1- to he: swung toward ithe lrighni. as the? stop a c 13 1' prohibitsuthe movement oi the loweredw weightedc end 12. Thea sidework iholden 6 is therefore.:withdrawn livmmrthe sticlv #3."

The iundenavork iholdero sis: also-shy the same actioin-n -removedr from: its; engagement ,Wll'rl'l the workiby reason ot thevf-act that the upperv 31 will return the under :work; holder.- :into

contact with the freshly insertedrstick the end 8O4aofcthe arm 7 Tbeirig first -removecl v weightedi end 12, -which constantly tends to bringthe side work holder 6 against the stickti. i h i The parts are now in normal position and the operation of turning the stick 3 1s proceeded With. A

In the Defiance or other lathe to which thi invention may be applicable, the cutters will operate simultaneously and uniformly upon the parts of the sticks 3 at which the steady rests 5 and 6 and the guides 16 and 38- are applied, and said rests and guides will therefore constantly be in contact with, respectively, the sides and under parts of the stick 3.

During the turning of the stlck the work holders 5 and 6, which engage at the weakest point, effectually prevent the vibration of such stick in either direction, and prevent the escape of the stick from the effective action of the cutters 2. The result is a uniform and smooth turning. -No amount of pressure of the knife cutters is available to set up this vibration in the stick, as the same is opposed by the Work holders 5 and 6, which latter are governed in their motions, respectively, by the guides 16.?and-88 these guides, beingmade to bear r tigh; y-againststhe tick neamthe contend,- whereiwsuch "stiokfl is. practically .withoutw-zvt 1 brationm It is obvious. that: those:skilletl intthe: art i may "varyatheadetails' 0f. iconstnuction andfl 1 arrangements 1 of p arts 1 without a departing from the-spirit o f any invention, l and theres fore I do uiotuvishzto be lilnitedrtosuch teas:

claims.

I claiina:

1; In coinbi nationewith a lathepiasteady'n rest including yieldable' means: adapted .to

holdlthe work substantially irigid iniopposia 180 v is drawn backefoninstance; toward the righti-w in Figs 3 i as -S11owm :iln- CIOtt SdCY IIDQSJ This shifting of the .xearniage v1 "causes :thezn-pper k end- 30 '-of; thes oscillatingeweighted: ar y? 1 tionto theivibrationiproduced the cutte1=s=,+ said I means adapted to he brought in contact 1 with the work at an intermediate point rhea tween the lathe centers Where the Vibration is great; and means i in contact nvith a simiw larly turned. part of the work near- :one nf- 2? the centers and eonnected to 'said first named f means and: adapted to lgovern the :yieldingw motion thereoitf substantially l'lS *describe'du 2." In coinbination-wvitha latl1e, =-a steady e rest including means: adapted to :'engage abe end- 30 of the arms? strikes the zproj ecting finger 28 Hand: depressesathe same andi the c bar "22 which carries it and said under. (work holder. Thesp-ring-iS-I is drawn outtolpermmitt-this y movement, and: whenrthe :carriaige 1 is returned in-thew oppositeudirection, a folt lowing upon: the rinsertion of a 9 stick to be turned in the lathe centers, :the a said wspringw neath "and at :one side: of the :work i at a I point r between v' the 1 lathe centersovh'erethe vibraf tionoffthework tends tobe greats "Silld 1 means being adapted to yieldin'glyr-su-pport of the lathe -rcente'rs where sthe vibration :of-

the work is very small, :andnconneetions be tween 1 s aid first and secondnamed -means whereby tlie 'same m ay be made to yieldin unison;substantially as "describeds 3. In combination with a lathe, a steady 10a rest"including"nieans adapted'to engage be r -"-neath"*the work, means adapted to engage the side of the work opposite to that operated upon by the cutters, means for yieldingly holding both such first and second named means in contact with the work at a weak point thereon where the vibration is great, an under guide adapted to come in contact with the work at a point thereon where the vibration is small, means whereby said under guide may control the yielding movements of the means for supporting the work from beneath, a second guide adapted to come in contact with one side of the work at a point thereon where the vibration is small, and means whereby said last named guide may be made to govern the yielding movements of said means adapted to engage the side of the Work, substantially as de scribed.

4. In combination with a lathe having a vibrating carriage adapted to bring the work into and out of engagement with the cutting knives, a steady rest including under and side work holders adapted to come in means whereby said work holders may be yieldingly supported, means whereby the Side"WOlk'llOlClGI' may be withdrawn from the Work \Vl'lBIl' said vibrating carriage is shifted to remove the work from engage-- ment with'the cutting knives, means associated with'said side work holderfor also withdrawing"the under work holder from engagement with the work when the carriage is so shifted, and under and side guides adapted to come in contact with similarly turned parts of the work near to where the work is supported, said guides beingconnected to said under and side work holders, respectively, whereby to control the motions *of thelatter,substantially as de scribed.

5. In combination with awood working lathe having a vibrating carriage, of a steady rest including a side work holder, a movable arm adapted to carry said side work holder yieldingly into contact with a weak portion of the work, a stop adapted to strike and shift said arm and work holder when the carriage is moved in one direction whereby to withdraw the work holder from the work, guide means in connection with a similarly turned part of the work at a point thereon where the vibration of the work is relatively small, said guide means being connected to control the movements of said arm and side work holder, an under work holder, means supported by said carriage for holding the under work holder yieldingly beneath said work at a point thereon close to said side work holder, means arranged between said arm and last named means? whereby the under work holder may be withdrawn from the work when the carriage is shifted, under guide,

from engagement with the work, an under work holder, an oscillating support mounted on the carriage for carrying said under work holder, an adjustable finger on said oscillating support adapted to be engaged by one end of said weighted arm whereby to depress the support and under work holder, adjustable yielding means connected to said oscillating support and adapted to bring the under work holder into contact with the work, a stop for said oscillating support, side and under guides mounted in connection with similarly turned parts of the work near where the work is supported, and means for connecting said side and under guides, respectively, to said side and under work holders whereby the same may be made to operate in unison, substantially as described.

In testimony whereof, I affix my signature.

' OSCAR O. CURTIS.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

Images