US152112A

US152112A - Improvement in patterns and core-bars for casting pipes

Info

Publication number: US152112A
Authority: US
Publication date: 1874-06-16
Anticipated expiration: 1891-06-16

Description

2 Sheets--Sheet l.

l. HUWDON.

Patterns and Core-Bars fu.;` vCasting Pipes.

Patented June 16, 1874.

Jaw@

2'Sheets--Sheet 2.

3.1. HWDN. `Patterns-and Core-Bars for Casting Pipes.. No.l52,l`l2.-

Patented June 16,1874.

{M1/*en or fig/7. Kw/da( UNITED S'rA'rEs ROB ERT J. HOWDON,

PATENT OFFICE.

OF CINCINNATI, OHIO, ASSIGNOR TO MARY E. R. HOWDON, vOF SAME PLAGE.

IMPROVEMENT IN PATTERNS AND CORE-BARS FOR CASTING PIPES.

Speccation forming part of Leters Patent No. 152,112, dated J une 15, 1874; application filed April 24, 1874.

To all whom it may concern:

Be it known that I, ROBERT J. HowDoN, of Cincinnati, Hamilton county, State of Ohio, have invented a certain new and useful Improvement in Patterns and Core-Bars for Mold in g and Casting Pipe, of which the following is a specication:

My invention relates to devices for forming the exterior mold and interior core for the formation between the two of cast pipe or vother hollow castings; and my invention consists, Erst, in a peculiar construction of a pattern by which the exterior mold is formed, the pattern being made hollow, and representing both exteriorly and interiorly the proposed shape and size ot' the casting, and being fitted with loose detachable prints/7 which, in connection with this hollow pattern and suitable core-bar, enable the melder to form the core in the pattern itself, and in the molded ends left bythe detachable core-prints, the object being to attain great speed in molding such ware, and precise accuracy and uniform thickness of metal composing the pipe or other ware in cross-section; second, in the provision in the construction of the core-bar of guides or ways upon it for the attachment yand guidance of a rammer, by which the core may be formed around the bar while the latter is in place in the hollow pattern; third, in a certain peculiar device for connecting' the ends of the core-bar to the flask, by which it is prevented from oscillation or other movement while in place; fourth, in the peculiar construction of a rammer fitted to slide upon the guides of the core-bar, and provided with projecting` vent-wires, which, in the operation of molding, will form and preserve vent-apertures throughout the entire length of the core; `fifth, in connection with the detachable end core-bar of an adjustable guide for supporting this end of the core-bar during the operation of ramming the core.

Figure l is a perspective view of the ribbed core-bar. Fig. 2 is a perspective view of the rammer. Fig. 3 is a sectional perspective view with a detachable wing attached to the bar. Fig. 4 is a cross-section of the core-bar and rammer. Fig. 5 represents the device for securing the end of the core-bar against displacement. Fig. 6 is a cross-section of the ilask, pattern, and core-bar with the sand rammed up. Fig. 7 is a section of the ilask through the line x x of Fig. 6, showing the process of ramming the core. Fig. 8 is a perspective view of the end of the core-bar with one form of detachable end attached. Fig. 9 is a perspective view of a modification in the form of the core-bar, one that will permit the core to be rammed in both halves of the ask at the same time. Fig. l() is a perspective view of the rammer for the bar shown in Fig. 9. Fig. 11 is a perspective view ofthe adjustable guide for supporting the bar during the operation of ramming and during the operation of casting. Fig. 12 represents vertical sections of a core-bar with the detachable prints in two positions, one for the formation of the exterior mold, and one for the formation of the core within the mold so formed. Fig. 13 is a cross-section of the iaslz, pattern, and core-bar when the ramming is being completed. Fig. 14. is a cross-sectionof the core-bar and circular rammer. Fig. 15 is a vertical section of the flask, pattern, and core-bar rammed up and ready forthe withdrawal of the pattern. Fig. 16 is a perspective view of 4a portion of the core-bar with a circular detachable end. Fig. 17 is a cross-section of the ilask and core-bar when the latter is rammed up in two halves.

A A represent the pattern, which is necessarily in two or more parts. B B represent the two halves of the iiask. The interior of the pattern represents in size and shape the interior size and shape of the proposed casting, and the interior of this pattern really forms a core-box, in which the core is formed upon which the casting is made. Hthin each end of this two-part hollow patl tern corc-prints O C are fitted, which are in two parts, like the pattern, so that at each end these core-prints serveto govern the size ot' the mold beyond the ends of the pattern, and the circular mold formed by these coreprints serves. when the core-prints are removed, to receive the end ot the core and support it centrally. D, Fig. 1, represents the ribbed core-bar, and D, Fig. 9, a'modication of' same. E, Fig. 2, represents the rammer when made to ram half the core in cases where the other half has been previously rammed before the ramming of the top part or cope of the flask, and E, Fig. 10, is the rammer when made to rain the entire body of' the core at one and the same time. The corebar D is made with ribs d, extending radiallyT from it, to give it stiffness without much weight, to prevent sagging or rising of the core, the ribs also serving to enter and hold the body of the sand which forms the core.

In cases where it is preferred that one half' of the core shall be rammed in the pattern, with the cope of' `the flask off, transverse ribs d may be used to assist in holding the sand; and in eases where irregularity in configuration ofthe interior'of the castings are necessary, transverse ribs c, which are detachable, may be used to support the sand to the outer extremities, or thereabout, of' such irregularity or projection. A guide, d", is formed upon the top of' the core-bar, over which the head e of the rammer E fits and slides, so that the rammer is guided properly in the ramming up of' the core. At one or both ends of the core-bar flat projections F project, which are perforated atf, and made to rest upon Hat-topped plates G, secured to or in the bottoln part of the flask. Iins g project from the plate G through the perforations f, and, by means of notches in these pins g, and keys Hite fit them, the projections F are made fast to the plates Gr, and thus prevented from displacement. This feature is of importance, particularly for curved castings where the core-bar is neces sarily other than straight. In cases where the core is to be rammed in whole at the same time,

. one end of the core-bar is made with a projecting rod, I, so as to permit the introduction of the rammer E, Fig. l0. To support this end I of the bar, the device shown in Fig. 1l is employed, which consists of a swinging plate, J, pivoted at i', and having' a curved seat, a, for the bar I to rest in, and a swinging and locking dog, K, to hold the bar I in place, the dog being secured in the closed position by the pin L. A curved slot and set-screw, M N, are devised to permit the plate to swing down to allow of the barbeing entered. The ramm er E is provided with vent-wires ef, which, in the process of ramnnng, serve to leave ventapertures throughout the entire length of the core, as shown in Figs. 13, 6, and 15. When the rammer is removed, after the ramming up of the core, the detachable end D of' the core-bar is fitted on to support the sand at the end of the bar, this `detachable end having perforations to match the detachable end in the core.

As indicated above, the core-bar can be rammed wholly by end ramming by the use of the rammer, Fig. 10, or may be rammed in part horizontally, with the upper flask off, before the end rammer, Fig. 2, is used. In the last-mentioned case, one halt' of' the pattern is first laid upon the usual follow-board, with the prints C in place. The lower part of' the flask is then placed over the pattern and prints, bottom up, and, when thus placed, this part of the ask is rammed up, so as to form, in this operation, one half of the mold for the exterior of` the pipe or casting and the end molds around the prints for the core to fill up. rlhe flask is then turned over and the core-bar, Fig. 1, secured in place. The prints C are then removed, and partingsand 7 applied to the molds they have formed. Vhile this half' of the pattern is still in place, half of the core can be rammed up in the pattern and around the ribs d', the sand also tting the cavities formed by the prints. The upper half of the pattern is then laid on, and the upper core-prints also laid in place, when the upper part or cope of the flask is placed on and rammed up, so as to complete the exterior mold for the casting. The entire flask is then turned upon end slightly and sand filled in the interior of the pattern endwise, and rammed up by the rammer E, Fig. 2, the action of' the rammer serving to force the core-print back into the position shown in the lower figure of' Fig. 12, so that the core can fill up the mold formed by the core-prints, as shown in that figure.

` When the core is completely rammed, the ventwires having, in the process, formed vent-apertures entirely through it, the other print is removed and its vacancy rammed up after the introduction of' detachable head D', so that the mold is then complete; and when the cope is lifted off, 'so that the pat tern can be withdrawn from the sand, the molten metalmay be run in through the ordinary gate or gates O, provided in the same.

When the core is to be rammed up entirely by end ramming, the process is the same, except the entire ramming of the core is left until the ilasks are both rammed up; and the exterior mold for the casting is, in this case, formed before the remmer E, Fig. 10, is used at all, and before any part of the core is formed. The ribs d of the core-bar may be perforated to assist in the support of the sand,

.as shown.

I claimy 1. The combination of two-'part hollow pattern A A', detachable prints U C, and corebar I), substantially as and for the purpose speciiied.

2.` In combination with the core-bar D, having a. guide, 61', the reciprocating rammer E e, operating substantially as and for'tlle purpose specified.

3. In connection with the core-bar D, the flat perforated projections Ff, plate G, having pins g, and key H, operating` substantially as and for the purpose specified.

4. The remmer E e, provided with projecting,` vent-wires e', operating substantially as and for the purpose specied.

5. In connection with the bar I of the core-bar, the swinging guides J K M N, connected and operating substantially as and for the purpose specified.

In 'testimonyr of .which invention I hereunto set my hand;

ROBERT J. HOWDON.

Witnesses:

FRANK MILLWARD, R. M. HUNTER.