US1317120A - wolever - Google Patents

Description

F. H. WOLEVER.

CENTHIFUGAL CASTING MACHINE.

APLICATION FILED JULY 9.1917.

2 SHEETS-SHEET l.

Patented Sept. 23, 1919.

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F. H. WOLEVER.

CENTRIFUGAL cAslNG MACHINE.

APPLICATION FILED JULY 9.1917.

' Patented Sept. 23, 1919.

2 S HEETS-SHEET 2- llllllly UNITED sTATEs PATENT oEEIoE.

FRANKLIN H. WOLEVER, .OF CHICAGO, ILLINOIS, AKSSIGNOB TO IDEAL ROLLER C0., OF

CHICAGO, ILLINOIS, A CORPORATION 0F DELAWARE.

CENTRIFUG-AL CASTING-MACHINE.

To all whom t may concern.'

Be it known that I, FRANKLIN H.. WOL- EVER, a citizen of the United States, and a resident of Chicago, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements in Centrifugal Casting-Machines; and I do hereby declare that the following is a full, clear, and lexact description thereof, reference being had to the accompanying drawings, and to the characters of reference marked thereon, `which form a part of this specification.

Thisinvention relates to a novel machine or apparatus for making compound rollers, for printing presses, type writing machines, clothes wringers and other uses, such for instance like the roller illustrated in my prior U. S. Letters Patent No. 1161756, dated November 25, 1915.

The present invention relates more particularly to an improved centrifugal casting machine for forming the shell or face layer of the roller, and to means for forming in the mold a liner against which the face layer is formed.

Among the objects of the invention is to produce a novel apparatus or machinefor this purpose, so constructed ,and arranged as to facilitate the forming of the liner and the roller shell; to provide a machine of this character in which the'centrifugal mold may readily be applied to and removed from the driving and supporting elements of the machine; to provide a novel meansfor centering the centrifugal mold in the supporting and drivingV elements; to provide novel means of cooling the mold during the shell forming or casting operation and to otherwise improveV and simplify casting machines of this general character.

The invention consists in the combination and arrangement of the parts shown in the 'drawings and described in the specification,

and is pointed `out in the appended claims.

Inv the drawings Figure 1 is ay side elevation of a casting machine embodying my invention, being part in section to show the mold liner.

w Fig. .2"r is an axial section of the mold after' the roller shell has been formed.-

. y specification of Lettersll'atent. l Patented Sept. 23, 1919.

original application med Aprn 21, 1917, serial 110.163,579. Divided and this semi No. 179,420,

application led July 9, 1917.

Fig. 3 is a similar view, showing the complete rollerand adapter tube therein.

Fig. 4 is an enlarged axial section of the machine, broken away between its ends. Fig. 5 is a section on the line 5-5 of Fig. 4..

The `frame of the shell casting machine shown inA Figs. 1 toy 5, inclusive, comprises a bed 10 and head and tail stocks 11, 12, respectively. The tail stock is adjustable longitudinally of the bed and is vlocked thereto by a screw 13 and nut 14, said bed being longitudinally slotted to receive a reduced portion of the tail stock.

The .cylindric rotative shell mold 15 is supported at its ends by conical centering members 16, 17, the mold being provided with end closing caps 18, which are annularly recessed to receive friction rings 19 that bear directly against the inner of said conical centering and supporting members. The centering member 16 is apically apertured and is fixed to a rotative drive shaft 20, shown as hollow to provide for the escape of gases from the mold through the apical aperture; and said shaft is mounted in suitable bearings 21 of the head stock. Power is transmitted to said shaft to rotate the mold by means of a pulley 22. A pipe 23 to provide for the escape of gas from the mold. and provided with a valve 24, is connected by an elbow fitting 25 with said hollow drive shaft by a rotative joint, and is supported from the head stock by a. bracket 26.

The opposite conical centering and supporting member 17 is supported through a suitable antifriction bearing 27 on the tail stock so as to. rotate freely with respect to the tail stock. It is provided with an apical opening through which and the opening of the adjacent end cap extends a feed tube 28, which latter is removably seated in a horizontal bore in the tail stock and is provided with a shouldered outer end 29 that limits the inward movement of the tube. Said tube is locked to the tail stock by a removable pin 30 and is closed at its outer end by' a plu 31, which may be locked to the shouldere end of the tube by a pm 32.

Removal of the plug 31 aiords access to the tube to clean the same. Upon removal of the pinv 30 the said plug and tube, locked together by the pin 32, may be removed together 'for a more complete cleaning of the tube. The tube is apertured between its 'ends forcommunication with 4the outlet end 33 of a funnel B4-that is supported on the tail stock, and through which the liner and shell materials are poured into Vthe mold.

1n assembling the mold in the machine, the screw13 `is loosened and the tail stock adjusted on the bed to permit the mold to bepassed between the enlarged end of the members 16 and 17, whereupon the tail stoclnwithits member 17 is slid inwardly to center the mold andclamp the mold between said conical centering` and supporting members. Thereafter the screw 13 locks the tail stock in place. After the mold has been assembled and is set in rotation, a quantity of the liner material, which has been accurately measured to produce a liner of a l given internal diameter, is poured through the funnel 34 into the rotating mold, and centrifugal force developed by the rotation of the mold causes the liner material to form against the wall of the mold to produce a liner 35 of uniform thickness.

In order to prevent the liner material `from cracking or checking, due to its contact with a cool mold wall, the mold is heat- ,ed toy a suitable temperature Vso as to allow the liner, when formed against the mold wall, to cool uniformly throughout its thickness and thereby avoid internal strains which may develop checks or cracks. A further advantage of preliminarily heating the mold is that the rise in temperature serves to slightly expand the mold whereby, 4upon cooling, the mold wall contracts upon the cooling liner and partly compensates for the shrinking of the liner due to its cooling. The liner is, moreover, elastic and is made of material that clings to the mold wall so that thecontracting of the shell does not .have the effect of parting the liner from the mold wall when the roller shell is formed therein.

After the liner is formed and hardened, the material to form the shell layer of the roller, which `previously has been prepared by a partial vulcanizing process, ismiXed .with a further vulcanizing agent and is poured through the funnel into the rotating, lined mold; the .charge of material having been accurately measured by a suitable measuring instrument to produce a shell of proper thickness and diameter to, correspond with the overall diameter of the roller and other conditions. The mold continues until the shell material has been forced outvwardly against lthe Aliner to form a shell 86 `of uniform thickness and has hardened to maintain a permanent shape. The heat of vulcanization raises the temperature in the mold, and the resultant gases pass from the material to the interior of the shell and outwardly through the escape pipe 23. Likelihood of gases being pocketed in the shell` is thereby avoided and the shell is formed with a very smooth outer surface of homogeneous te'Xtureralidv free from moisture. Air is circulated through the mold at high speed while the shell is being formed, as by means of a fan 37 connected to the pipe 23, so as to properly cool the shell material. Circulation of air through the mold while the liner is being formed and hardens is not required, and the valve 24C may be closed whilethe liner is being formed.

The liner material is of such character, or is so treated prior to the formation of the liner, as by the addition of a readily miscible agent having a higher melting temperature than the `liner material, that its fusing temperature is relatively higher than the vulcanizing temperature of the shell mateL rial, but considerably lower than the fusing point of the shell after it has set. 1n this manner the forming surface of the liner is maintained intact against break-down under the action of the vulcanizingtemperature of the shell while being formed which, should it occur to the slightest extent, would injure the face of the liner and consequently roughen the face of the shell and necessitate a grinding operation to properly finish the shell.

An advantage of the construction described lies in the ease with which the mold chamber 15 may beremoved from the machine, it being only necessary to release the screw 13 and slide the tail stock outwardly such distance as will permit one end of the mold, which may be thus freed, to pass the larger end of its adjacent conical supporting member.

A further advantage found in the use of said construction is that the end caps 18 are held in place by the pressure which supports and centralizes the mold chamber in the machine, so that no special holding means are required to hold or retain the caps on the mold during the casting operation. Therefore, when the moldis removed said end caps may be readily detached from ,the ends of the mold preparatory to setting the mold in the stationery casting machine. The rubber rings or gaskets 19 provide eflicient driving connections between the mold chamber and the supporting members.

The machine herein shown is adapted to be used with the form of casting machine shown in my (5o-pending application for U. S. Letters Patent, Serial No. 17 94.21 iiled of even date herewith, which said application and the present application are divisions of my prior application for U. S. Letters Patent Serial No. 163,57 9, filed on the 21st day of April, 1917.

I claim as my invention 1. Apparatus for casting roller shells comprising a mold, rotative centering members adapted to engage, center, and support molds of different diameters, and means to rotate one of said members.

2. Apparatus for 'casting roller shells comprising a mold, removable end caps for said mold, rotative centering members constructed to receive the ends of said caps to center and support the mold, and means to rotate one of said members.

3. Apparatus for casting roller shells comprising a frame, a mold, rotative supporting members adapted to engage the ends of the mold to center molds of varying diameters, an anti-friction bearing between one of lsaid members and the frame, and a drive shaft fixed to the other member.

4. A mold, rotative centerin members to engage, center and support mo ds of different diameters, a rotative drive shaft fixed to one of said contering members, and a feed pipe extending through one of said members into said mold.

5. A mold, rotative centering members to center and support the mold, a rotative drive shaft fixed to one of said centering members, and a feed pipe extending through one of the members into said mold, said drive shaft being hollow to conduct air and gases from said mold.

6. In combination with rotative, opposed, hollow, conical mold centering members and a mold supported on and centered by said members.

7. In combination with rotative, opposed, hollow conical, mold centering members, a mold supported on and centered by said members, and bearings for said centering members, with means for rotating one of said members.

8. In combination with rotative, opposed hollow conical mold centering members and a mold supported and centered thereby, of a feed tube extending through one of the said members into the mold.

9. In combination with rotative, opposed hollow conical mold centering members and a mold supported and centered thereby, of a feed tube extending through one of the said members into the mold, and a removable axial lug to close said tube.

10. n combination with rotative, opposed hollow conical mold centering members and a mold supported and centered thereby, of a feed tube extending through one of the said members into the mold, a bearing for said tube, means to detachably lock the tube in said bearing, a plug to close the tube, and

\ other .detachable means to lock said plug to said tube.

11. The combination with a frame, and a rotative, mold, of a feed tube extending at one end into the mold, with means to removably lock it to the frame to permit end- Wise withdrawal of the tube, and a plug to close the outer end of the tube, with other means to detachably lock it to said tube.

12. In combination with a frame, opposed, hollow conical mold supporting and centering members, a rotative ,drive shaft mounted in said frame yand fixed to one of said meinbers, an anti-friction bearing between the other member and said frame, said latter member being provided with an apical opening, a feed tube supported in the frame and extending at its inner end through said apical opening and into the mold, a hopper connected to the feed tube between the ends of the latter and a removably mounted plug to close the outer end of the feed tube.

13. A roller shell casting machine comprising a frame, a fixed head stock, a movable tail stock and mold supporting and centering members frictionally engaging the ends of the mold rota-tively mounted on the head andV tail stocks, respectively.

14. A roller shell casting machine com-y prising a frame, a `fixed head stock, a movable tail stock, opposed mold centering and supporting devices to frictionally engage the ends of the mold, a rotative drive shaft mounted in the head stock and fixed to one of said members, a mold supported on and centered by said memlbers, and means to feed material to said mold.

15. Apparatus for casting roller shells comprising a mold, rotative centering members to center and support the mold, removable end caps for said mold, adapted to engage said centering members and to be thereby held in place on the mold.

16. A mold, rotative centering and supporting members engaging the ends of the mold, a drive shaft fixed to one of the members, said shaft being hollow and communieating with the interior of the mold, and a suction fan connected to said hollow shaft.

In witness whereof I claim the foregoing as my invention, I hereunto append my signature in vthe presence of two witnesses at Chicago, Illinois, this 7th day of June, 1917.

FRANKLIN H. WOLEVER.

Witnesses:

W. L. HALL, A. E. WALBRIDGE.

Copies of thisipatent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. G.

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