US724105A - Machine or appliance for forming cores. - Google Patents

Description

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APPLICATION FILED AUG. 16. 1902.

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MACHINE 0R APPLIANGE FOR FORMING G-ORES.

APPLIOATION FILED AUG. 16, 1902.

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UNITED STATES wPATENT OFFICE.

WALTER JONES, OF AMBLECOTE, NEAR STOURBRIDGE, AND EDWARD WRIGHT, OF STOURBRIDGE, ENGLAND; SAID WRIGHT ASSIGNOR TO SAID .I ON ES.

MACHINE on APPLIANCE FOR FORMING cones.

SPECIFICATION' forming part of Letters vPatent No. 724,105, dated March 31, 1903.

Application filed August 16 1902. Serial No. 119,900. (No model.) v

To a/ZZ t may concern,.-

Be it known that we, WALTER J ONES, of f Titan Works, Amblecote, in the county of Staord, near Stourbridge, and EDWARD WRIGHT, of 64 Union street, Stourbridge, in the county of Worcester, England, subjects of the King ot' Great Britain, have invented certain new and useful Improvements in Ma- 'chines or Appliances for Forming Cores for Molds of Tubular Castings, such as Pipes. fand Columns, of which the following is a ried around by the core-bar as it is turned under or past a bar which is4 parallel with the side of the core-bar and of which the nearest surface is spaced away from the corebar a distance to give the required size of core, such bar being constantly reciprocated endwise of its length. The edge or side of 'the reciprocating bar which is toward the core-bar is beveled or rounded forl the purpose presently shown, and if beveled it isj preferred to form along the inner edge of the bevel a width of surface which is tangential to the surface of the -core which is formed; The sand is placed upon the surface of the core-bar, and as the corebar is carried around the sand is gradually pressed down as it passes across the beveled upon the core-bar.

-or curved surface of the reciprocating bar, and is thus consolidated and remains fixed upon the ycore-bar, and if any 4portion of the surface of the sand as it is turned upward again is not up to the full shape further sand placed upon such portion will tend to fill up any depression therein as such portion of the surface is carried around again under or past the reciprocating bar, and so on until the core hasl been formed. The surface of the core-bar is wetted, before applying the sand thereto, with a mixture of fresh sand and water. There is no necessity to form spikes upon the core-bar to hold the sand, as

is sometimes done in the case of core-bars for cores of tubular castings, though it is preferred to form `the surface somewhat rough by scoring the mold in which it is cast. The cores may be skin-dried in a stove before being placed in the molds.

In the accompanying drawings, which illustrate an embodiment of the invention, Figure lis a front elevation of the apparatus used informing cores in the manner above described, av portion of the middle being broken away for convenience of illustration. Fig. 2 is a plan of the apparatus shown by Fig. l with thesand-board,'hereinafter described, omitted and a portion of the middle also broken away. Fig. 3 is an end View of the apparatus. Fig. 4 is a transverse section, to an enlarged scale, through the corebar land an elevation of one of the collars, hereinafter described,therearound,and shows also a section of the reciprocating bar, hereinafter described, in its proper position in relation to the collar. '.Fig. 5 is a detached vertical section through the collar shown by Fig. 4. Fig. 6 is an end View on a larger scale than the principal views. Fig. 7 is a sectional detail view on a much larger scale than the principal views and showing the core-bar and 'reciprocatinglbar of the apparatus in transverse section.

The bed A of the yapparatus is supported on standards B B. The core-bar C is carried at each end in bearings formed of two rollers a, which are pivoted in a block D. The rollers of each pair are mounted to turn in different but parallel planes and overlap one another to som'eextent. thus kept in a central position may be readily lifted out of its bearings. Each block is formed with inclined parallel sides which are capable 0f sliding withinF inclined guides E, and these blocks may be packed up as required to suit-dierent diametersof core-bars. The sole-plate F, with which the guides .E are formed,is carried upon p laned parallel faces of the bed A,and a portion c of each sole-plate iits between the two sides of the bed. Each soleplate is cramped down upon the bed to fix it in any desired position thereon by means of a @ramp-bar G, which vbears against the under side of the upper member of the bed at The `core-bar while IOO v each side, and by means of bolts d. which pass through the sole plate and through the cramp-bar. The bearings may thus be moved in to any positions along the bed to suit any required length of corebar. The bearing at the right-hand side of Fig. l and the corresponding sole-plate F and cramp-bar G are shown in section. A collar H is placed around the core-bar at each end of the portion thereof upon which the sand is to be packed, and these collars are of the outside diameter, respectively, of the intended core at each end. One of these collars in any case should be readily removable from the core-bar, as otherwise it would be inconvenient and often impossible to withdraw the core-bar from the casting. It is preferred to make both the collars readily removable, so that either of them can be removed. For this purpose each journal n of the core-bar is made somewhat less in diameter than the barrel to leave a shoulder at the end of the barrel against which the corresponding collar is butted. A stud e projects from each journal a distance back from the corresponding shoulder somewhat less than the full thickness of the collar, and each collar is formed (see particularly Figs. t and 5) with a notch f across its interior face, which allows it to be passed over the corresponding stud, and with an inclined surface g at its outer side face, which as the collar is turned in the direction of the arrow, Fig. 4, after it has been pushed up against the corresponding shoulder of the core-bar is brought across behind the corresponding stud e and the collar thus tightened in place between the stud and shoulder. The corebar is revolved in any convenient manner, such as in the manner hereinafter described.

A longitudinal bar J,conveniently of a deep and relatively narrow section, which runs parallel with the side of the core-bar and extends somewhat beyond the collar thereof at each end, is carried upon supports in a position inclining'downward from its hinder edge toward the side of the core-bar, and the forward or inner edge of the barJcornes just up to the peripheries of the collars H, but does not actually bear on the same. The bar J is reciprocated endwise in any convenient inanner as the core-bar is revolved, such as in the lnanner hereinafter described, and is carried in any manner which permits of its endwise movement. According to a convenient method of carrying the bar J it is laid back against inclined guide-rollers K, carried in standards L, fixed upon the bed of the apparatus, and is prevented from slipping olf the rollers by flanges h, formed around their lower ends. The portion of the bar J which would show at the left-hand side of Fig. 2 if the view were complete is omitted to show` the parts below more clearly. The bar J is formed beveled along its inner edge, with the beveled surface toward the upper side of the core-bar, as clearly shown by Fig. 4, and the 'ragion eXtreme inner edge of the bar J is formed, preferably, as a rnarrow strip or surface t', which is substantially tangential to the surface of the sand when the core has been formed upon the core-bar. The sand is fed onto the core-bar immediately in front of the beveled edge of the bar J, the core-bar being at the same time revolved in the direction of the arrow, Fig. 4, and as it passes under the bar J it is compacted upon the core-bar. The outer surface of the sand when packed upon the core-bar is indicated by the broken lines, Figs. l and `2, which run parallel with the sides of the core-bar. In lieu of forming the bar J bevel-edged it may be rounded to give a lead in for the sand between itself and the core-bar, and the bar may therefore be circular in section, if desired. The collars H provide an abutment for the sand at each end and insure that the ends of the core will be properly shaped, whereas if the collars were not employed the ends of the core would be irregular and uneven.

The sides of the blocks D which carry the rollers a and the guides E are inclined, as shown, so that notwithstanding the blocks have to be varied in position as to height to suit varying diameters of core-bar any corebar will be maintained in the same relation to the working edge of the reciprocating bar as any other core-bar.

The standards L, which carry the rollers K, are extended upward behind the rollers and carry an inclined board M, upon which the sand is first placed and from which it is drawn olf onto the core-bar C.

We will now describe convenient means of revolving the core-bar and reciprocating the bar J.

A transverse shaft N, mounted in bearings at one end of the apparatus, receives motion through the fast pulley of a pair of fasmand loose pulleys 0 and carries a worm P, which gears with the worm-wheel of a shaft Q. The shaft Q drives the core-bar from a pulley R, which is geared by a belt with a pulley V on the end of the core-bar. This last-mentioned pulley is omitted from Figs. l, 2, and 3 of the drawings to avoid hiding other parts; but it is seen in place in Fig. 6. It is slipped on the end of each core-bar before commencing to form the core and is slipped olf before removing the core-bar from the apparatus. A pulley or chain-wheel 'l on the shaft N drives a shaft U, which carries on its forward end a disk 7c and disk-pin Z, and the disk-pin l reciprocates the bar J `through the medium of a connecting-rod fm.

If a core made in the above manner is required to have any enlarged portion thereon, such as for the socket of a socket-pipe, such portion may be molded up in a core-box or struck up in loam in a manner which will be well understood or prepared in any convenient manner and be subsequently placed around the core which has been formed in the manner of this invention.

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The rotative speed of the core-bar, the reciprocating speed of the bar J, and the stroke or extent of movement of the latter may of course vary considerably. We have found, however, that for cores of from two to six inches in diameter a rotary speed of about three revolutions per minute will be satisfactory.- The bar J may have a stroke ofabout one-half an inch and may make from two 4hundred and Vfifty tothree hundred reciprocations or double strokes per minute with good results.

Having fully described our invention, what we claim, and desire to secure by Letters Patent, is

1. A core-forming mechanism comprising a rotating core-bar, and a non-rotative, longitudinally-reciprocating bar adjacent to and parallel with said core-bar for compacting sand upon the latter and smoothing it.

2. An appliance for use in forming cores for molds of tubular castings in ordinary damp molding sand (known as green sand) which comprises a core-bar carried in suitable bearings and means for rotating the same, a bar running lengthwise thereof and spaced apart therefrom to give the required thickness of sand between itself and the corebar, and means for constantly reciprocating such bar endwise while the core-bar* is rotated, substantially as set forth.

3. An appliance for use in forming cores for molds of tubular castings in ordinary damp molding sand (known as green sand) which comprises a core-bar carried in suitable bearings and means for rotating the same, a bar running lengthwise thereof, having a beveled or curved surface along the inner edge at the side thereof toward which the core-bar rotates, the said bar-being spaced apart from the core-bar to give the required thickness of sand between itself and the corebar, and means for constantly reciprocating such bar endwise while the core-bar is rotated, substantially as set forth.

4. An appliance for use in forming cores for molds of tubular castings in ordinary damp molding sandV (known as green sand) which comprises a core-bar carried in suitable bearings and means for rotating the same,ia bar running lengthwise thereof having a beveled inner edge at the side thereof toward which the core-bar rotates and a width of surface along the inner edge of the bevel which is substantially tangential to the surface of the sand when the core has been formed, the said bar being spaced apart from the core-bar to give the required thickness of sand between itself and the core-bar, and means for constantly reciprocating such bar endwise while the core-bar is rotated, substantially as set forth.

5. An appliance for use in forming cores for molds of tubular castings in ordinary damp moldingsand (known as green sand) which comprises a core-bar carried in suitable bearings and means for rotating the same, a bar of a deep and relatively narrow section runninglengthwise thereof andspaced apart therefrom to give the required thickness of sand between itself and the core-bar, means for constantly reciprocating such bar endwise while the core-bar is rotated-,and inclined rollers which carry such reciprocating bar, substantially as set forth.

6. IAn appliance for use in forming cores for molds of tubular castings in ordinary damp moldingsand (known as green sand) which comprises a core-bar carried in suitable bea-rings and means for rotating the same, collars around such core-bar of the diameter of the required core at each end, respectively, against which the sand abuts, one,

and preferably each, of the collars being re-v movably fixed upon the core-bar, a bar running lengthwise of the core-bar and spaced apart therefrom to give the required thickness of sand between itself and the core-bar, and means for constantly reciprocating such bar endwise while the core-bar is rotated, substantially as set forth.

7. An appliance for use in forming cores for molds of tubular castings in ordinary damp molding-sand (known as green sand)\ which comprises a core-bar carried in suitable bearings and means for rotating the same, collars around such bar of the diameter of the required core at each end, respectively, against which the sand abuts, and in respect of one of suclrcollars, and preferably in respect of each of suchpcollars, a shoulder around the-core-bar against which the collar abuts, a studprojecting from the core-bar a distance from the shoulder somewhat less than the full thickness of the collar, a notch through the bore of the collar to enable the collar to be passed over the stud and against the shoulder of the core-bar, and an inclined portion at the outer face of the collar which tightens itself behind the stud as the collar is turned in one direction in relation to the core-bar, and a bar running lengthwise of the core-bar and spaced apart therefrom to give the required thickness of sand between itself and the core-bar, and means for constantly reciprocating such bar endwise while the corebar is rotated, substantially as set forth.

In witness whereof we have hereunto signed our names, this 30th day'of July, 1902, in the presence of two subscribing witnesses.

WALTER JONES. EDWARD WRIGHT.

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