US1028601A - Pattern. - Google Patents

Description

E. PIPHBR.

- PATTERN. I

APPLIUATION FILED Nov. 27, 1911.

Patented June 4, 1912.

2 SHEETS-SHEET l.

l. MIM PLANooRAPH :0..WASNI To E. PIPHER.

PATTERN.

` APPLICATION FILED Nov. 27, 1911.

1,028,601 Patented June 4, 1912.

2 SHEETS-SHEET 2.

:mmm n 'Y EDWARD PIPHER, OF PORT HOPE, ONTARIO, CANADA.

PATTERN.

Specication of Letters Patent.

Patented June 4, 1912.

Application iled November 27, 1911. Serial No. 662,729.

To all whom t may concern:

Be it known that I, EDWARD PIPHER, a British subject, and resident of the town of Port I'Iope, in the county of Durham and Province of Ontario, Dominion of Canada, have invented certain new and useful Improvements in Patterns; and I hereby declare that the following is a full, clear, and exact description of the same.

In the casting of hollow bodies, such as bath-tubs, laundry tubs, kettles and other articles of like nature, it is the customary practice to use a male pattern to form the interior surface of the vessel, and a female pattern to form the exterior surface, the female pattern being relatively larger than the male pattern for the thickness of the vessel wall. Nhen such bodies have proj ecting members, it has heretofore been necessary to use a flask or molding boX consisting of several separable parts for the drawing of the pattern, and in some cases, it has been necessary to complete the formation of the imprint of the pat-tern by placing one or more cores in the mold cavity, the use of the cores however, depending upon the na7 ture or form ofthe projecting members. For example, in the cast-ing of a bath-tub having four sets of lugs for the bath-tub feet, the lugs of each set being normally separated, it has been necessary to use a pattern with four sets of projecting members to form, in the molding sand, four cavities beyond the surface of the body of the pattern, and to use a multi-part flask which can be separated for the drawing of the pattern. It has also been necessary to use four cores for each tub, these cores being placed in the cavities formed by the projecting members of the patterns, the cost of the cores in the operation of a plant making a large number of tubs per day, amounting in the course of a year, to a considerable sum.

The object of my present invention is to devise a pattern which will form the necessary imprints'for the projecting parts without the use of cores, and this object is attained by the construction hereinafter set forth and particularly pointed out in the claim.

As the general construct-ion of the pattern and the method of producing in the molding sand, a mold cavity identical in form with that of the body which it is desired to cast, it will not be necessary for me, in the present application, to either show or describe the pattern or its corresponding flask part further than to villustrate the novel feature of the present invention.

In the drawings: Figure l, is a vertical sectional view ofpart of avpattern for a bath-tub constructed according to my present invention. Fig. 2, is a similar view taken at right angles to Fig. 1, and Fig. 3, is a vertical section of part of a bathtub.

The principle of this invention is applicable to the casting of solid or hollow bodies with projecting parts, but for an example to illustrate the principle of the invention, I have shown it invconnection with a pattern for a bath-tub.

In the casting of a bath-tub, it is necessary to provide in the mold, cavities for the lugs a, to which the bath-tub feet are attached, and to form these cavities without the use of cores, I employ movable pattern members o, to be positioned beyond'the mold forming surface of the normally stationary pattern member c, for completing the formation of the imprint in the molding sand, and then retracted therefrom rfor the separation of the moldV and pattern. The lugs a, of each set, are normally separated by a groove a', and to form the mold cavities for each set of lugs, I use two normally separated pattern members as shown in v Fig. l. These pattern members are movable through slideways e in the stationary pattern member c, their movement being guided by feathers f contained in corresponding grooves in the walls of the slideways. rlhe adjacent faces of the movable pattern members b are provided within the stationary pattern member c, with overlapping lugs g, through which passes a pin h rockably connecting the movable pattern members to one end of a connecting rod z', the other end of the connecting rod i being adjustable lengthwise in a'sleeve j provided with an eccentric strap la, encircling an eccentric Z mounted on the shaft m.

To accurately form the groove a between the lugs af, I provide the movable pattern members b with means maintaining them in liXed relation to each other during the formation of the mold cavity and their withdrawal therefrom, this means in the present instance, comprising a spring o which presses their inner ends outward from each other and their outer ends against that part c of the pattern between them.

In forming the imprint for the exterior rotating the eccentric Z a portion of a rotation in the direction indicated by arrow in Fig. l, this motion of the eccentric forcing the eccentric strap 7c and its connected parts,

. z'. e. the sleeve j, connecting rod z', and movable pattern members, inward 1n the direc-v tion indicated by arrow in Fig. 2, to bring the movable pattern members within the exterior surface of thestationary pattern `member c without injuring the cavities orV core formed by the movable pattern members in the molding sand. When the movable pattern members have been withdrawn from the lcavities formed by them in the molding sand, the flask part with its imprint can be removed from the pattern for assembly with its'corresponding iask part, the two flask parts then being brought into exact correspondence to accurately form the mold cavity.

I have shown and described my invention inconnection with the casting of bathtubs, merely as onevexample of its use, to illustrate its principle of operation, but as it can also be used in connection with the casting of other metal bodies either of a hollow or 'solid character, having projecting parts, changes in the shape and characteriof such projecting parts being provided for by corresponding changes in the shape of the movable pattern members, I do not desire to confine the use of the invention to the casting of any particular article, and it will be understood from the foregoing description that the essential principle of my invention is a pattern comprising a normally stationary pattern member and a movable pattern member coperating therewith, said movable pattern member being selectively positioned for the formation of the mold,

and retracted therefrom for the separation of the mold and pattern.

I have used the terms stationary pattern member and movable pattern member in a relative sense, z'. e., the pattern member c is normally stationary with relation to the pattern member and the latter is movable with relation to the pattern member c.

Having thus fully described the nature of my invention, what I claim as new and desire to secure by Letters Patent, is:

In a pattern, the combination of a normally stationary member provided with a mold forming surface and with slideways; a reciprocating member carrying a pivot associated with said stationary member; movable patterns adapted to enter the sand of the mold through said slideways mounted on said) pivot and provided with extensions; and resilient means associated with said extensions adapted to normally force said movable patterns toward each other, substantially as described.-

Port Hope, November 1st,`191l.

EDWARD PIPI-IER.

Signed in the presence of- W. T. BUSH, C. H. Bromas.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. C.

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