US2473160A

US2473160A - Mold jacket

Info

Publication number: US2473160A
Application number: US544851A
Authority: US
Inventors: Frank L Madrigal
Original assignee: Individual
Current assignee: Individual
Priority date: 1944-07-14
Filing date: 1944-07-14
Publication date: 1949-06-14
Anticipated expiration: 1966-06-14

Description

June 14, 1949. F. L. MADRIGAL 2,473,160

MOLD JACKET vF11@ 1 Ju1y 14, 1944 2 sheets-sheet 1 June 1,4, 1949,

F. 1., MADRIGAL 2,473,160

uom JACKET Filed Ju1y,1,4, 1944 2 sheets-sheet 2 Z Z8 .L 2/

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I nventor +I? w" Ww v gatented June 4;'1949 UNITED STATES PATENT OFFICE Mom JACKET Frank L. Madrigal, Tulsa, oma.

Application July 14, 1944, Serial No. 544,851

a claims. (c1. zza- 109) This invention relates to molds for making metal castings and especially for making steel castings and more particularly to mold jackets slipped over the mold during the pouring of the metal, and it has for its main object to provide removable clamping means which may be attached to the mold jacket or to the parts or elements of which it is made in those cases in which it is of advantage to hold the bottom board and the jacket firmly against each other.

It is a further object of the invention to provide jackets to which clamping means may be removably attached without however providing any projecting or additional parts on the jacket or on the sections of which the jacket consists.

A further object of the 'invention consists in providing spring-pressed clamping means which are, however, protected against damage by the molten metal poured into the mold. The resilient pressure of the spring will avoid breakage and cope displacement such as frequently occurs when weights are used for pressing the mold against the bottom boards as customary.

A further object of the invention consists in providing a removable lock construction for holding the bottom board which is easily mounted and removed and provides an effective and re liable clamping means for holding the bottom board.

With these objects in view the invention consists of a jacket which may comprise a number of circumferential sections applied against the mold and slightly tapering in accordance with the tapering shape of the mold, which jacket or jacket sections are provided with taperingy recesses. Into these recesses lock members may be inserted which are provided with spring pressed members resiliently pressing the bottom board against the mold and with means for protecting the springs against contacts with the metal. In this way the disadvantages associated with the use of Weights holding the mold pressed against the bottom board or those associated with the use of fxedly attached locking means are overcome and a simple and eective construction is provided which will materially reduce breakage and copedisplacement and which will eliminate the necessity of keeping large stocks of jackets or jacket sections, thus removing one of the causes for high waste of material inherent in the methods as now practiced.

One modification of the invention is illustrated in the accompanying drawings, in which- Figure 1 shows an elevational view of the jacket according to the invention when placed on a mold glithdthe locks in position for holding the bottom oar Figure 2 is a plan view of the jacket placed over the mold. I a

Figure 3 is an elevational cross-section through the jacket and the mold along the line 3 3 of Figure 2.

Figure 4 shows a plan view partly in section of the lock when seated in the jacket the section being taken along line 4-4 of Figure 1.

Figure 5 shows a perspective view of the base member or holder of the lock. As shown in the example illustrated in Figures 1 and 2, the mold I0 consists o f a drag I I and of a cope I2; the drag is resting on the bottom board or mold table I3. The sides of the mold are slightly tapering toward the top, as customary vwith molds used for metal and especially for steel casting, the extent of the tapering (which 1s around 7 degrees) being somewhat exaggerated in the drawings.

In the top I4 of the mold the gate I5 and various small holes I6 permitting the escape of the airand gases are provided as customary.

The mold is surrounded by the jacket Il according tothe present invention which ts-exactly over the mold and which consists of four separate sections I8 (Figures 1 and 2) united by bolts I9. The inner sides of said sections are slightly tapering toward the top to fit the tapered parts of the mold. In the center of each section or at least in the center of two sections tapering recesses 20 with undercut side portions 20a are provided adapted to accommodate the base parts or holders 22 of the locking mechanism generally indicated at 2l.

The recesses 2B are tapering toward the bottom so that said locking means 2| may be inserted from the upper end. Said locking means consist of a base plate or holder 22 (Figure 5) tapering toward the bottom and provided with beveled side edges 23. The base plate is therefore of wedge-like shape and Wedge-like cross-section. The beveled edges 23 are dovetailing with the undercut side portions 20a. They are holding the base plate 22 rmly when slipped into the recesses 20.

Said base plates are moreover-provided with an enlarged head 24 and with two lugs 25 arranged one above the other and projecting from the base plate outwardly. These lugs are pro vided with holes 26 which are aligned. Through them a locker bar 21 passes which at its upper end is provided with a bolt on which a handle 28 maybe secured. The lower part of the locker the tongue or clamp Il which reaches under the 'mold table or The protective sleeve 3| reaches down as far as possible and has a flaring end which is turned outwardly. It protects the spring against contact with molten metal which inevitably is spilled on the top of the mold during the pouring of the metal and ilows down the sides.

The spring 30, as seen in Figuresv 1 and 3, presses the tongue of the locker bar 21 upwardly and, therefore, presses the bottom board i3 against the drag Il. y

It is, therefore, seen that the use of the jacket 2i manner corresponding tothe taper of the-side walls of the mold, and with recesses tapering towards the bottom, comprising removable locking devices adapted to be held within said recesses and provided with base plates tapering towards the bottom. each device carrying a locker f bar, a tongue on said locker baifor engaging the bottom board of the mold, a spring for pressing said locker bar upwardly and a sleeve covering said spring to protect it against spilled metal.

2. A mold jacket provided with a bottom board, said jacket comprising sections having inner walls tapering towards the top, means for joining adjacent sections near their lateral substantially vertical edges to form a closed frame, the outer wall of each section being provided with a recess, said recess having two substantially vertical walls facing each other tapering towards the bottom,

according to the present invention presents many zo advantages.

As soon as the so-called setting out of the mold (removal of a snap ask or the like) has been performed the jacket is slid downover the mold,

the locker bars are operated by turning the handle 25 vided for this purpose in order to prevent the rising of the copes. This method, although very simple, has however its drawbacks as it frequently 35 causes the copes to sag.and even causes breakage when carelessly practiced. Moreover, it obstructs the view so that the pourer who has to stand at a certain distance has no clear view of the gate.

The use of the jacket proves to be especially of advantage in connection with the casting method utilizing blind heads where the breakage is greatest.

The invention has been illustratedV by showing only one modication; but it is manifest that a number of details, combination of details and mechanisms may be modiiied without departing from the essence of the invention.

What I claim is:

1. A clamping arrangement for use in connection with molds having a plurality of side walls tapering inwardly toward the top and having a bottom board, and with a jacket consisting of sections joined at their edges to form a closed frame like structure, said sections being provided with inner walls tapering toward the top in a a removable clamping and locking means for holding the bottom board, provided with a back plate fitting intothe above named recess so as to engage the two tapering side walls, and spring pressed means carried by said back plate for gripping and holding said bottom board and for pressing against the underside of the mold jacket.

3. A mold jacket provided with a bottom board, said jacket comprising sections, provided with means for joining them V'at the lateral vertical edges to form a closed frame, each section being further provided with a recess in its outer side wall, the lateral walls of the recess facing each other being undercut and tapering towards the bottom, a removable clamping and locking means for holding the bottom board removably towards the jacket, said clamping and'locking means including a base plate with tapering inclined lateral walls, dovetailing with the undercut tapering recess walls, said base plate carrying a spring pressed locker bar, provided with a projecting member at its end forv gripping and holding the said bottom plate.

FRANK L. MADRIGAL REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS