US1601450A - Means for supporting core bars in flasks - Google Patents

Description

Sept. 28 1926.

J. R. M WANE MEANS FOR SUPPORTING CORE BARS IN FLASKS INVENTOR, I

sheetsghft Filed May 9. 1925 Q WEJIQW WITNESSES J v 1 1,601,450 J. R. MCWANE MEANS FOR SUPPORTING CORE BARS IN FLASKS Filed May 9. 1925 2 Sheets-Sheet 2 INVENTORI Patented Sept. 28, 1926.

" JAMES B. MCWANE, or BIRMINGHAM, ALABAMA.

I MEANS FOR SUPBQRTI'NG CORE. BARS. FLASKS... 7

Application filed. May 9,

This invention relatesfto method of and means for supporting core bars in flasks, and is designed as an improvement on the structure shown and described in the pending application, filed by me on December 12, 192%, Serial N 0. 755,512, for a patent on means for supporting core bars in flasks, v

The object is to improve andtostrengthen the means for holding the elongated. core bars, with the sand cores thereon, which are necessarily used in the making of cast iron pipe or other similar tubular castings by the iorizontal method of casting, wherein the cope and drag sections comprising the flask i are fitted together in a horizontal position,

with the two halves of the mold formed therein and the cores in position ready for the pouring of the metal.

Another object is to provide holding or supporting means which engage the endsof the core bars where they extend beyond the ends of the mold in addition to supports provided by the end transverse webs of the drag section and clamp the bars sufliciently to stiffen the same and take up any sagging and prevent movement at their intermediate portions due to their relatively great length and weight. It being understood that the use of ordinary chaplets is entirely dispensed with in the present method of supporting the cores. By supporting the core bar at two points on each end and clamping the bar down on these two points, the bar be- 7 comes what is known in mechanics as a continuous beam, as opposed to a simple beam,

and thereby is made much more rigid.

A final object is to provide means which may be adjusted to impart a rigidly-held, downward flexing of the core bars at their intermediate portions, so that the latter are eccentrically related to the surrounding walls of the molds, such adjustment being made with a nicety suflicient to allow said core bars with the cores thereon to be forced upwardly to the exact center of the molds by the incoming flow of the molten metal, which tends to float the bars and cores, and thus produce castings having walls of uniform thickness, such flexing having-the effect of placing the core bars under suflicient tension to prevent any further sagging of the same, prior to the pouring operation.

A full and complete understanding of the invention may be obtained from a consideration' of the following detailed description,

1.925. Serial N6. 29,094.,

taken in connection with the'accompanying drawings forming a part of this specification, it being understood that while, the V drawings show practical formsfof the in,- vention,'tlie latter is not to be confined to. strict conformity with the showing thereof, but may be changed or modified, so'long as such changes or modifications mark no material departure from the, salient; features of the invention, as specificallypointe out in ,theappended. claims,

In the drawings, in which similar reference characters designate corresponding parts throughout the several figures:-

Figure l is a side elevation partly insection of a flask having the invention applied thereto and showing the, core being sup.-' ported and a portion of the Casting sur rounding the core. 'i v Figure 2 is a plan view. of the drag section of a 'doublepipe flask, the cores being held in position by the improved means.

Figure 8 is an end elevation of the flaskv drawn on'a larger scale.

Figure 41s a transverse section taken on the line 4-4 of Figure 1;,

Figure 5 is a detail perspective view of the Iglamping yoke used in tensioning the core.

ars.

' Figure 6 is an end elevation of a drag section having slightly modified means for, engaging the ends of the core bars.

Figure 7 is an venlarged detail partly in section, of the same. i Referring to the drawings, there is shown a double flask used in-the manufacture of cast iron pipe by the horizontal method, the said flask comprising a lower 'or drag section 1 which is adapted to be placed upon the floor of the foundry in an inverted p0 sition, and a superimposed-cope section 2, formed in all main respects identically the same as the drag section, except with some: minor details, and adapted to rest upon the drag in reverse position, and to be rigidly 109 connected to the same by suitable clamps, or in any other desired manner, to prevent" their relative movement during the pouring of the metal.

The cope and the drag formed of suitable cast metal so asto stand repeated use, andare in the form of boxes open at the top and bottom, their abutting edges when in use, being considerably wider than their other edges, as clearly shown in sections i are each Figures 8 and 4 of the drawings, so as to provide ample space for a double mold and yet reduce the weight and cost of the same.

Each section is provided with a plurality of spaced and alined transverse webs 3 and 3 integrally joining the longitudinal side wall thereof to strengthen the same and to hold the mold sand in position, there being suitable, centrally disposed, semi-circular openings 4 formed in the long, or abut-- ting edges or the transverse webs, and also the end walls, which, when the two sections are properly related for use, form a complete circular opening of suthcient diameter to permit of a continuous sand mold to be made throughout-the length of the casting. Each drag section is formed, at each end, with a longitudinally disposed arm 5, which is integrally connected at its outer end, to the inner face of the end wall 6 of the drag, an'd'at'its inner end to the next adjacent transverse web 3, the arm being located substantially at the longitudinal center of the drag, and having formed in its lower facea'recess 7, provided with a narrow entrance slot 8, the said seat and slot being at the exact center of the drag and between the aforesaid core ba'r openings.

Each drag section is also provided at each end with a pair of outwardly extending, horizontally disposed lugs 9, preferably formed integrally therewith and lying in the same horizontal plane and slightly below the opening 4 therein, the said lugs being in vertical alinement withthe centers of said openings and provided with strengthening webs 1O beneath the same.

Vertically disposed set screws 11 are adapted to be threaded through the outer portions of the lugs 9, the active ends oi? the same being directed upwardly to contact beneath the exact centers of the extended ends of tubular core bars 12, which contact with the arcuate walls of the transverse webs 3 which have been machined as seats for the core bars 12.

The core bars 12 with the cores proper 13 formed of suitable sand thereon. are lowered into the lower half 14 of the mold already formed in the drag section and onto the'machined webs 8, the exact verticaland horizontal positions of the axes of the core bars being thus assured with relation to the centers of the molds.

Adapted to coact with the aforesaid arms 5 at each end of the flask is a yoke member 15, formed preferably of a heavy, solid casting of proper metal, and provided on its under face, at each end, with a flat seat 16 adapted to rest upon the core bars where th y, extend beyond the ends of the sand core proper. The yolres are further provided with end enlargments 17 of areuate form on their upper faces to strengthen the terminals of the same, and a central, vertical aperture 18 extends therethrough for the reception of a tie bolt 19, having a head 20 at its lower end which is adapted to be easily and quickly fitted into the aforesaid seat or recess 7, in the arm 5 beneath the same, by moving the bolt transversely. into the entrance slot 8, as will be readily understood. (Figure 4).

The yol-Ies occupy the space in the upper or cope section Q'betweenthe end walls and the adjacent transverse webs 3 thereof, when properly positioned upon the core bars in transverse relation to the flask, said space, in each section, being free of the mold sand, as clearly shown in the drawings. With the head of thetie bolt engaged in the said seat and transversin the hole in the yoke, as described, the nut 21 is turned at each end of the iiask to cause the core bars to be held down in the machined webs 8. The set screws 11 do notengage the core bars until after the yokes 15 are fastened down on the core bars. fightening 0; the yokes causes a leverage betweenthe yokes on top of the core bars and the machined webs 3 underneath the core bars, the points 3 act ing as fulcrums, a. d the downward pressure of the vokes-raising the intermediateportions or the core bars.

After the yokes are fastened down and he intermediate portions of the bars are thus raised, theset screws 11 are adjusted. The pressure of these screws'upward causes the yokes in turn to act fulcruins, setting the intermediate portions ot the bars sli htly below center so that the pressure of the molten metal w'll float the bars back to center instead of outof'center, thus assuring uniformity in the thickness of the walls of the pipe or other tubular casting.

Great pressure may be brought to bear uaon the end portions of the core bars to cause them to be supported rigidly in position with the desired amount of tension therein by means of the action or" the yoke in opposition to the set screws, and this degree of pressure may be equally distributed between the two core bars by the action of a single tie bolt, which has proven, in practice, to be a great advantage, as the two castings are made alike and the one adjustment serves for both.

In Figure 6 there is shown a drag section 22 having a substantially semi-circular core bar opening 23 formed tl erein with vertical, parallel side walls 24 at its upper edges. AZ the lower ends of the vertical portions, there are formed undercut recesses 25 and the side walls are further provided with vertical grooves 26, into which there are adapted to be driven out nails orother thin wedges 27, the lower ends of which may or may not engage with the roundedsurface of the openings and be bent inwardly, as shown when the core bars'are in position. This makes a positive lIOlL-tO-ITOII engagement and positively prevents any lateral movementot the extreme ends of the core bars.

From the foregoing it will be seen that simple means have been provided which ma be readily incorporated in the drag sections or flasks for the manufacture of cast iron pipe or other tubular castings said means serving to rigidly support the core bars against movement throughout their lengths, and also serving to im art a deflection or depression to the intermediate por ions of the core bars to be overcome by the action of the metal in :floating the same and the continuous beam principles referred ton-0t only stiffen the core bars against the tendency to move upward but also prevent sidewise movement, thus insuring uniformity of section throughout the entire circumference.

What is claimed is 1. Means for supporting core bars in flasks comprising a bottom support consisting of machined webs, and independentelements located within the flaskand bearing on top of the core bars, properly spaced from the webs in the direction of the ends of the core bars, and adapted to" exert a leverage to raise the latter at their central portions.

2. Means for supporting core bars in flasks comprising a bottom support consisting of machined webs, independent ele ments located within the flask and exerting pressure on top of the core bars in spaced relation to the webs in the direction oi the ends of the core bars to exert a leverage to raise the latter at their central portions, and means for lifting the terminals of the core bars outside of said independent elements to overcome the raising of said central. portions and deflect the same.

3. Means for supporting core bars in flasks comprising vertically adjustable ele ments mounted on the ends of the flask exteriorly thereof to engage the extended ends of the core bars and constitute an end support for the latter, and independent elements located within the flask and bearing on top of the core bars and adapted to exert pressure thereon to depress the latter at their central portions both the said adjustable elements and the said independent elements being carried wholly by the drag section or" the flask.

4. Means for supporting core bars in a double flask comprising lugs formed on the ends of the drag section of the flask directly beneath the extended ends of the core bars, screws mounted in said lugs to contact with the extended ends of the core bars, a yoke. arranged within the flask and bearing upon the topsides of the core bars and means for exerting a downward pressure on said yoke to deflect the core bars at their centers, said yoke being carried by the. drag section or" the flask.

5. Means for supporting and centering a core in a flask comprising vertically adjus able elements arranged exteriorly on the ends of the drag section to contact beneath the ends ot the core bar and support the same, separate elements located within the cops section andbearing on top of the core bar adgacent to the ends thereof, and means connecting the last named elements to the drag section and adapted to draw the same standing lugs formed on the ends of the drag sections of the flask and directly beneath the extended ends of the core bars; set screws threaded upwardly through said lugs to contact with and support the core bars, a yoke arranged adjacent to the inner face of each end wall of the-cope section and bearing upon the top sides oi the spaced core bars in spaced relation to the screws, and means for exerting a downward pressure on said yokes to deflect the bars theircenters, said yokes being carried by the drag section of the flask.

'1 Means for supporting spaced, parallel cores in a double flask and preventing their risingat the central portions thereoi by floating on the molten metal as the latter poured, said means comprising upwardly adjustable supporting abutments carried by the drag section of the flask to contact beneath the extended ends 01 each core bar beyond the end walls of the drag, separate and removable yokes arranged transversely within. the end walls of the cope section and adapted to hear at their ends upon the core bars in spaced relation to the supporting abutments, and a single centrally disposed bolt connecting each yoke to the drag section and adapted to draw the same tightly down upon the core bars.

8. A double flasktor casting pipe or other tubular objects and having cope and drag sections provided with core openings said drag section having outwardly extending longitudinally disposed lugs carried by the end walls thereof and located beneath the core "openings, vertically adjustable set screws mounted in the lugs and adapted to contact with and support the ends of the core bars outside 01" the drag section, a longitudinally disposed arm formed at each end of the drag section and connecting the inner faces of the'end walls with the next adjacent, transverse webs of the drags, said arms having seats for removably receiving bolt heads, a separate, removable yoke arranged transversely of the drag, the ends of the same resting on the core bars within the cope section, said yokes each having' a central, vertical aperture, and a tie bolt traversinp; each aperture and provided with a head to be removably seated in the longitudinal arm and raving a nut to bear upon the yoke and bind the same on the core bars in a downward direction in opposition to the set screws.

9. A double flask for cas 'iingr pipe or the like composed of cope and drag sections having core openings for permitting the ends of the core bars to extend therethronn h. vertirally adjustable abutments or supports mounted on the ends of the drags to be engaged by the ends of th core bars, yolres bearing on top oil the core bars in spaced relation to the supports, means for error 1119' a downward pressure on the yolies to rlex the intermediate portions of the core bars in a downward direction, the core openings in the drag section having; vertical grooves at the sides of the core bars, and wedges adapted to be driven into said grooves to bear against the sides of the bars to prevent side movement thereof.

I 10. In a double flask for elongated tubular castings and composed of a cope and a drag section having" complementary core bar openings, adjustable supports arranged exteriorly on and in spaced relation to the ends of the drag; section and adapted to contact with the ends of the core bars whore extended through said openings, longitudinal arms formed integrally with the drags and extending substantially along the longitioned in the mold of the drag, said yolies each having a central bolt hole, tie bolts having heads to enter said seats and to trarse the yokes, and nuts for drawing the yokes down on the core bears.

11. Means for supporting elongated core bars in a horizontal position in flasks without the us of chaplets to prevent movement '5 the same comprising supporting means ror supporting-the core bar with the core thereon at points remote from each end, means for exerting downward pre sure on top of the bar at each end outside said supporting; means so as to cause the bar to fulcrum on the supporting means and overcome sagging therein, and means for exerting upward pressure beneath each terminal of the to overcome the downward pressure and depress the center of the bar near the longitudinal axis of the mold, all of said means b ing located in and carried by the drag section of the flask whereby when floating action takes'place on the incoming molten metal it will bring the bar and core in axial alignment and secure uniform thickness in the walls of the casting.

In testimony, that I claim the foregoing as my own, I have hereto affixed my si9== nature.

. J AMES R. MoWANE.

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