US1765024A - Core guide - Google Patents

Description

June 17, 1930. J. R. M wANE coma GUIDE Filed March 2, 1929 grw'ntov James Z9. Wi /1e (Maud Patented June 17, 1930 UNITEVVSTLA-FESQ JAMES. R umwnnn, or ,B RMINGEAM, ALABAMA, nssreuos; T0 MQWANE onsrmon PIPE COMPANY, OF BIRMINGHAM, ALABAMA, CORPURATION OF ALABAM'A cons Gurus Original application filed nareu19, 1eas ,ser1a1 No. 262,683. Divided and um application filed March 2,

' 1929.-S eria11\To .34i3,887.

This invention relatesto core guides, and aims generally to provide an IDIPITO'VGCl flash prlmarily adapted for making cast iron pipe by the horizontalmethod, and having simple but rugged means forpreventing longitudinal movement of the core, which would injure or destroy the casting, while permitting ready seating and removal of the core and also clamping'thereof for deflection, as described in Reissue No. 17,121 dated October 30, 1928. This application is a division of my copending application, Serial No. 262,688, filed March 19,1928, and the invention herein scribed is regarded as an improvement on the flask claimed in my pending application,

Serial. No. 111,218, filed May 24,1926, wherein longitudinal and lateral core guides are described. n I i 3 In the accompanying drawings showing a preferred form of the invention',-'

Fig. 1 is'aplan view of the drag section of a flask provided with the improved core guides, showing the core bars in dotted lines Fig. 2 is a vertical section tlirough theerag of Fig. 1, with parts broken away 5 Fig. 3 is a sectionv on line138 of 1;

Fig. 4 is a detail View, crane of the yolres clamping two core bars in their seats. I 'In the drawings there is shown the drag section only of a flask which, in this instance, designed for the casting of four pipe lengths. A commercial flask, as shown, may make four 6-inch pipes each 16 feet long, allbeing of the l bell and spigot type. Necessarily there are four cores used with such a flash, the cores being provided by hollow steel cylinders, termed core bars, on which a green sand core is formed, as will be understood. As the cores mustbe shaped to provide a casting with a bell end, it follows that if the cores are not longitudinally centered'with respect to the molds, the bell ends of the castings will be misshapen and may have areas sothin that they will break during cooling or during handling of the pipes or when they are sub jected to hydraulic pressure. f the cores are not coaxial with the molds, the castings will have thin places on one side. Hence it is of primary importance to space the core accuguides are employed, being integral with one 7 of the end walls of the abutments for the annular flanges on core bars to prevent longitudinal movement thereof in- I wardly; the core bar clamping and deflecting means claimed in Reissue No.1i',121 preventing outward longitudinal movement after the cores are seated, and the machined webs or drag andserving seats disclosed in the samereissue-preventing I lateral movement of the'ends of the core bar. Referring particularly to the drawings,

. there is shown a drag 5, having one'end wall 6 provided with integral bosses 7 having their outer faces'8 machined, said bosses beinglocated preferably at diametrically'opposite points, on each side of the cut-out portions9 through which the core bars 10 project. The upper faces of the bosses are plane surfaces and are flush with the'top edges of the walls of the drag. When the core bars are placed on the drag, they are supported near their opposite endsby the machined webs or seats 11, but are otherwise clearof all parts of the drag, and of course, clear of the mold itself. Each core" bar hasa'n'annular flange 12 (Fig 1) near one end which is used in holding the core bar against longitudinal movement during formation of the core, as disclosed in my pending application Ser. No. 216,467, filed August 30, 1927. As each core bar is seated, the operator pushes the flanged end inwardly until the inner face offlange 12 abuts the outer machined faces 8 of the bosses. As the flanges 12 are accurately located relative to the sand cores which are formed on the core bars, and are carefully machined to abut both the bosses, it follows that the cores are ac-' curately centered longitudinally relative to the mold, while the accurately machined seats 11 center the core bars laterally.

As disclosed in Reissue No. 17,121,tl1ecore bars are then clamped securely in their seats and are deflected at intermediate points to counteract the floating and sidewise deflecting action of the molten metal, so that as the casting har-dens,the core bars are truly coaxial withthe mold, orvery nearly so, yielding substantially uniform castings. It has been found that any flask construction whereinno core bar clamping means is used is'impracticable, even if core bar guides are employed, because of the likelihood of movement of the core bar longitudinally or laterally or both, even though initially seated and centered with the utmost care. The core bar clamping and deflecting means shown consists of two yokes 13 (Fig. 4) at each end of the drag, each yoke contacting with the tops of two core bars, and being tightened by means of a bolt 14 whose opposite end passes into a slot 15 provided on a projection 16 011 the drag. As. each bolt 14 is drawn tight, the

yoke pulled down thereby will clamp two core bars against their seats thus deflecting them upwardly at intermediate points, thereby overcoming the natural sag of the core guiding of, the core bar. l/Vhile two bosses 7 12116 shown for each core, bar, the pairs of bosses could be made integral and assume the form of a single semi-circular boss, whose outer surface would necessarily be machined for contact with the circular flange of the core. bar, thus determining the position of the core with respect to the mold. This obvious variation needs no illustration.

The invention represents a decided advance over the construction of my pending application, Serial No. 111,218 because the I two verticalspaced ribs of said application are eliminated. Instead of using one pair of ribs for lateral guiding and a second pair for. longitudinal guiding, a single pair of strong and rugged bosses are used, and the machined seats are depended upon for lateral guiding. Thus th invention provides longitudinal guiding means far simpler of construction, much easier to make, and much that the bosses or guides of the longitudinal more able to withstand the wear and tear of constant use.

Obviously the invention may be embodied V in other forms than the one shown.

What I- claimis 1. A flask section for'pipe and the like hav- J ing an end wall provided with an outwardly projecting, integral boss, said boss having an outer machined" face and being so spaced; relative tothe mold as to-guidethe-core bars longitudinally; the top of said boss being flush with the top of the flask section.

2; In combination, a.flasksection for pipe and the like having an end wall provided with an outwardly projecting, integral-boss, said boss havingan outer machined face and being sospaced relative to the mold. as to guide the core bars longitudinally; the top of said boss being flush with the top of the flask section; and a core bar having a flange projecting laterally thereof for contact with the outer machined" face of the boss.

3. In combination, a flask section for pipe and the like having an end wall provided with a pair of outwardly projecting bosses, said bosses being at diametricallyopposite points adjacent theopening for'the core bar and each having its outer face" machined,

and a core bar having anannular-flange near one end for contact with the two machined faces aforesaid.

4. In combinatiomaflask section for pipe and. the like having an end wall provided with an outwardly projecting, integral boss, said boss having an outer machined face and being so spaced relative to the mold asto guide the core bars longitudinally; the top of said boss being flush with the top of the flask'section; a core bar having, a flange projecting laterally thereof for contact with the outer machined face of the boss; ma-

chined'seats on the flask section near the opposite ends thereof for support and lateral guiding of the core bar; and core bar clamping means located beyond the core barseats and adjacent the opposite ends of theflask section.

In testimony, that I claim the foregoing as my own, I have hereto affixed my signature.

JAMES R. MoWANE.

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