US1391728A - Spline-carrying-machine element - Google Patents

Description

w, 1. FISHER. SPLINE CARRYING MACHINE ELEMENT.`

APPLICATION 'FILED FEB. 16, '11920.

1,039 1,728. Pamdsept V2.7, 1921.

i i "m- A :M- .o

UNITED, vs TATES PATEN T OFFICE.

ALVA J. FISHER, or EVANs'rolv,v ILLINOIS.

srLINE-CARRYING-MACmuE ELEMENT.

original application mea December 23,' 191s.

j to provide the shaft receptive hole-and the spline slot, and into said slot theseparately- Inadespline mustvbe accurately fitted, either Vwith a drive `fit or'with provisions for rivetretention. Inherently V these elements 'are relatively expensive, even in quantityV prolduction. Generically-such splined elements must be?accuratein,shaft-hole, size andl centering, inthe location, extent of projection 'andsi'ze ofthe spline,*and inrm anchorage fofthe spline inthe element-body. 'Of course these machine-elements may take an unlimyitednumb'er ofieigternal forms, sizes, and de- "signs,.a nd lin a great number of instancesthe element'to `be produced iS of afcharacter'- that might well have its body made of `cas`tmetal ifthe; requirements as to *the shaft-hole and the spline can be met in the castarticle.

:Myinvention is intended toprovide an inexpensives'atisfactory construction of splinecarryinglmac'hine-element having yits vbody a `'casting and' adapted' to be'made by the economical process and by means of the simple apparatus set ,forth in4 my, copending application ASerial N o. 267 ,991,1 filedl December 23, *1918, of which this-is va division.r As a singlelinstance, forpu'rposes of disclosure, .Ihave selected a splined clutch-element as the subject of illustration, (but without intent, of course, to limit my invention in its broader aspects to such specific article), and in the drawings, Figure 1 is a perspective view, with parts broken away, showing the splined clutch element with a cast-metal body; Fig. 2 is a perspective de` tail of a sleeve o'rlinerg'Fig. 3 is a perspective detail of a spline-member detached, and Fig. 4 isa section of a mold with aV core and other parts assembled therein ready for theV casting of the element-body.

In detail the particular element illustrated in Fig. 1 is aclutchl member 10 adapted for sliding fit with a grooved shaft,

and the body llof the member is shown as a casting shaped to provide end heads l2 Specification of Letters'Patent;

Serial No. 267,991. February 16, 1920.

Divided and this application filed serial Nofssassa. f

`and an intervening` reduced Waist 13, each r head having crown teeth or The shaft hole 15 extends axially through the body and is faced with avliner 516,' preformed to its cylindrical contour of Specified diameter. Through a slot 17 in this liner and into the shaft spline-member 18,v partly embedded `in the ody-casting, and cooperating with the liner and the cast body so that the several parts mentioned are united with substantially the rigidity and permanency ofan integral structure.

For the production projections `14.

ofthe specific article thus illustrated one preferably employs a usual casting Yiiask 20, having a suitable san`d-cavity,-anda special core element 22 congruent, in part, with the pattern and designed ffor coperation'wi'th the sleeve 16 and spline 18 duringthe casting operation. :This core element-is so constructed that'it kmaybe'.removed subsequently to the completion of the casting. The core-element 22 has heads 24 and24 preferably of metal to constitute chill blocks, and these-heads lit" in the guide portions of the cavity, as shown in Fig. 4. In the `simpleelement shownthese two heads may be duplicates in external shape, and provided with confronting recesses-,25`to give fornito the clutch teeth 14 of the machine-element. One-head' 24 is ax- /ially removable from the Acore stem-26 that connects them,"suoh` head fitting snuglykon-a reduced stem-extension '27 in the end of Which there is a chord-notch to engage a transverse pin '29 insuring that the removfable head-alwaysgoes Von thecore-stem in vthesame position Awith its notches 125 in proper register with, or in desired angular relation to, the notches in the opposed fixed head 24. The stem-extension 27 should preferably be of diameter less than that of the stem 26 by an amount at least equal to the intended projection of the spline 18 into the shaft hole, and for the reception of the spline a groove 30 is made along the stem, one end ofthe groove opening through the shoulder between the stem 26 and eXtension 27.. l

Before the core is put in the mold cavity, the sleeve 16 is placed on the stem 26, with the slot 17 radially registering with the groove 30. The the registering slot and groove, so as to project through the former and rest on the b015- .I-'Iatented Sept. 1921.

spline 18 is then placed in hole 15 there projects a tom of the groove, being all dimensioned interfitting in the stated relation. vThe up-v per portion of the spline 18 projects above the level of the liner 16, to be invested by the cast material of the body 11. Speciically the spline may be a steel bar ends turned up as at 18:L and with small ears 18b struck out at the angles of the ends and longitudinal-bar of the spline. tire upper edge of the bar of the spline, its laterally extending ears 18h, and its radially extending ends 18, may all be invested with the cast metal. A

When placed in the mold, the parts are in absolutely centered position, with the spline most accurately located and positioned against displacement, so that all v that ref mains to be done for completing the article is to veffect the casting operation inusual fashion.

After the casting has been completed the machine-element is removed from the sand,

the detachable head of the core pulled off, and the core stem withdrawn `from the shaft hole. The external surfaces of the article may be then treated in any way usual with i the treatment of castings.

For the production of many classes of machine elements no Vmachining whatever of the product is necessary. VIn none of them is machining ofthe shaft hole `or spline requisite. The units thus produced areof greatest uniformity and precision in the centering, size and straightne'ss of the shaft holes and in the location, size and extent of projection of the spline. Spline anchorage is absolute. l j

Of course it will be understood that the shape ofthe spline may be widely varied, and that contour-changes of the embedded portions of the spline may bev made. For one instance, the up-turned ends 18-whieh, in the present illustration, advantageously coperate with the thick head-portions of the cast body, might not be at all suitable to some articles, of spline bar maybe employed With accordthese pre-formed parts, and shaped` for neat,

with its i Thus the en-I but other anchoring-shapesant change in details of the mold, if need be; and in all such details it will be understood that, while certain features ofmy invention are claimed in detail for their specific advantages, 4many changes may be made without departure from the spirit of my invention in its broader aspects, and within the scope of the appended claims.

What I claim is:

1. A splined-machine-element comprising a shaft-receptive liner having a slot a spline projecting inwardly through said slot and outwardly beyond the liner, and a cast body exteriorly investing said liner and the outwardly-projecting spline portions. Y 2.,A splinecarrying machineelement comprising ya liner affording. and defining an axial shaft-hole and having an opening therein, a cast body yinvesting said liner, and a pre-formedspline partially embedded in said cast body and extending through said opening in the liner. j

3. A splined machine-element comprising a liner defining an axial shaft-hole and having an opening, a V cast body investing said.-

liner, and aspline having an axially extending body and` outwardly turned ends, said ends embedded in said cast body and said spline extending through said liner-opening.

4. A machine-element comprising 1n combination a cylindrical liner Vhaving a slot, a spliner having a longitudinal bar and upturned ends, said bar extending through said slot and said ends Vprojecting radially there-v beyond, and a body cast'aroundsaidliner .Y

and spline-ends. c Y y j j 5; As an article of manufacture, a unitary machine element comprising a cylindrical liner having a slot, a spline of non-circular cross-section arranged longitudinally.

of said slot with itsinner portion projecting inwardly through said-slot and its outer por.- tion projecting and a cast-metal body exteriorly investing outwardly beyond the liner,

saidv vliner and' the voutwardly: projecting 1',

spline portion and uniting them with the body, substantially as specified; `v A VA J. FISHER.

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