US2055548A - Slip jacket - Google Patents

Description

Sept. 29, 1936./ J. B. MEYER sLIP JACKET Filed Jan. 9, 1936 UNITED VSTATES PATENT GFFICE SLIP JACKET John B. Meyer, Dubuque, Iowa, assignor to The Adams Company, Dubuque, Iowa, a corporation of Iowa Application January 9, 1936, Serial No. 58,285

4 Claims.

This invention relates to slip jackets, sometimes also known as strippers, used for the purpose of protecting sand molds during the pouring of the castings, and has special reference to a metal jacket of improved structural characteristics.

Slip jackets of the type herein contemplated are intended for use in foundry practice, and are slipped over the sand molds just prior to the pouring operations and after the removal of the flask. It is therefore necessary that the jackets maintain an accurate inner shape so as to closely t the outside of the mold. It is in this respect that slip jackets most frequently fail, and after a period of use lose their accuracy and become Warped or twisted so that they no longer properly fit the outside of the mold. This is occasioned by two types of factors, the first being the conditions to which the jacket is subjected during the pouring operation. Some strain is placed on the jacket by the pressure of the metal in the mold cavity and also the pouring process occasions rapid changes in temperature, the jacket being heated during the pouring process and then being rather rapidly cooled when removed and placed on a fresh and cold mold. The second factor is the rough handling to which the jackets are subjected. Normally .the jackets are tossed about rather carelessly and given rather severe treatment. Under these circumstances the jackets tend to get out of shape and most frequently this occurs at or near the corners. I have found that this may be largely avoided by certain improvements in the mechanical construction of the jackets whereby the strength and rigidity of the structure are balanced to a greater nicety and are enhanced at the points where increased strength and rigidity are normally required.

A primary object of the invention is the provision of an improved slip jacket of greater strength and rigidity and having a longer useful life under the rough handling to which such devices are ordinarily subjected.

Another object of the invention is the provision of a metal slip jacket of such construction that the changes in temperature to which the same is subjected in use and the rough handling usually accorded such devices does not cause it to loose its accuracy and trueness of shape.

A further object of the invention is to provide a metal slip jacket having an improved corner construction.

Other objects and advantages will be apparent from the following description and the accompanying drawing, in which- Figure 1 is a top view of a slip jacket embodying my invention;

Fig. 2 is a section on the line 2-2 of Figure 1, and

Fig. 3 is a fragmentary perspective showing of 5 the corner construction of the slip jacket.

The invention contemplates a metal jacket having side walls 5, 8, 'I and 8 of sheet metal, the walls in this instance each consisting of a relatively heavy plate having longitudinally spaced openings 9 for the passage of gases in the usual manner. Corner angle members II to I4 are positioned at the corners of the body extending laterally of the body and seated over the outside of the corners. The side walls 6 and 8 are 0f l5 such length as to extend completely into the corner of the angle members while the side walls 5 and i abut against the walls 6 and 8 adjacent the end, as shown in Figures l and 3. The corner angle members are secured in place by any suitable means, in this instance by spot Welding, as shown at I5 (Fig. 3). These corner angle members hold the sideA walls together in the required positions and prevent lateral displacement of the walls at the corners.

Angle reinforcement members indicated generally by the numerals I6 and Il are laterally spaced on the sides 5 and 'I of the body and eX- tend longitudinally thereof. These members are preferably spot welded to the side members as shown at I8 and I9. Angle reinforcement members 2I and 22 are likewise positioned on the sides 6 and 8 of the body members and are attached thereto in the same manner. The reinforcement members are of angle metal, and one side is arranged to seat in surface contact with the side members, as best shown in Fig. 3. It will be understood that other means than welding may be employed for securing the reinforcing members to the side members, though I prefer to weld the two together to make a firm and rigid connection. Each of the reinforcement members extends beyond the corners of the body as shown in Figs. 1 and 3. To accomplish this, each of the reinforcement members is bent or formed adjacent its ends as shown at 23 to provide a space 24 for the reception of the corner angle members I5. The space 24 is such that the reinforcement members will t snugly against the outer surface of the corner angle members so as to conne the latter between the side walls and the reinforcement members. One side of the reinforcement members I6 and I7 is cut away flush with the corner members I5 as shown at 25 and 26 so that the 55 reinforcement members I6 and 2| and the reinforcement members I1 and 22, respectively, may overlap at each corner, as shown in Fig. 3. 'Ihe reinforcement members are interconnected in this overlapping area by welding as shown at 21. It will be understood that other suitable connecting means, such as rivets, may be employed for this purpose, though I prefer to Weld the same. It will be seen that this forms a rigid reinforcing member extending completely around the body in' a truss-like manner producing a very rigid corner construction. By this means the points of Weakness heretofore occurring at intervals around the body and usually at or adjacent to the corners of the body are entirely eliminated. Wood blocks 28 and`2`49 attached to the reinforcing members 2l "serve as grips for handling the slip jacket in placing and removing the same from the mold.

I desire to place particular emphasison Ithe construction whereby the reinforcement members are extended to overlap beyond the'corners of the body and are interconnected in this overlapping area so as to provide a rigidv connection spaced diagonally outwardly from the corners, and to the fact that-this connection is formed on the reinforcement members which extend completely around the body of the jacket, the side walls'of Athe jacket being attached thereto Whereby distortion of the side Walls is prevented by the angle reinforcement members. The number of reinforcement angle members will vary dependent .upon the depth of the jacket. Ordinarily it is advisable to use at least two annular reinforcement ribs formed by the reinforcement members, vbut a single reinforcement rib may be employed satisfactorily if the jacket is very shallow.

rWhile I have thus described and illustrated a specific embodiment of my invention, I am aware that numerous changes may be made from that herein .illustrated and described, and I do not wish to.be limited except as required by the prior art and the scope of the appended claims, in which- I claim:

1. The combination in a metal slip jacket of sidewalls arranged to form a corner, a corner' walls and seated over the outside of said corner, and a plurality of reinforcement angle members fixed to the outside of said Walls extending longitudinally thereof over said corner angle members and beyond said corners overlapping in pairs, and being rigidly interconnected in the overlapping area to form annular ribs.

2. The combination in a metal slip jacket of side walls arranged to form a corner, a corner angle member extending transversely of said walls and seated over the outside of said corner, a plurality of reinforcement angle members having one side seated against and fixed to the outside of said walls extending longitudinally thereof, the reinforcement members of adjoining Walls overlapping beyond the corner and being shaped to seat against said corner angle member toconnethe same, and means to rigidly connect said reinforcement angle members in to form annular ribs, the reinforcement members of each'rib being rigidly interconnected in the overlapping area to Vprevent distortion of said walls.

4. The combination in a metal slip jacket of side Walls arranged to form a corner, a corner angle member extending transversely of said walls and seated over the outside of said corner, a plurality of angle reinforcement members having one side seated in face contact .with the outside of said walls, fixed thereto and extending longitudinally thereof, the other side of said members projecting at an angle with respect to said walls, the reinforcement members of adjoining walls seating against said corner angle member and the angularly disposed portions f

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