US1296945A - Core-forming appliance for patterns. - Google Patents

Description

F. GAISLER CORE FORMING APPLIANCE FOR PATTERNS.

APPUCATION FILED SEPT; 10. 1917.

1 996,945 Patented Mar. 11, 1919.

mi i

Iwvawvon Uivrrm) STATES PATENT OFFICE.

FRED GAI'SLER, or s'r. Louis, MISSOURI, ASSIGNOR or ONE-HALF TO rnnneanr, m,

OF ST. LOUIS, MISSOURI.

V CORE-FORMING APPLIANCE FOR PATTERNS;

ToaZZ whom it mayconcern: r 1

Be it known that I, FRED GArsLER, a citizen of the United States of America, a resi dent of the city of St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Core-Forming Applian-cesfor Patterns, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of thisspecification.

My invention relates to improvements in patterns, and moreparticularly to means whereby a green sand core can be formed at the time the main part of the mold is formed. The new-core-forming devicecan be used to form a straight core, uniform in diameter throughout its length, such, for example, as a car wheel core. The invention can be used in making various kinds of cores which, owing to'the lack of draft, cannot be formed by the pattern itself. In the manufacture of car wheels it is customary to use dry sand cores, and the labor and expense of making and handling such cores is entirely eliminated by the present invention. Furthermore, the green sand core formed by the new. device can be more easily removed from the casting, and since the core is formed as an integral part of the green sand mold, there are no fins or rough corners at the junction of 'the core and the 7 main body of sand.

The preferred form of the invention comprises a pattern provided with a core-receiving opening, and a core-forming sleeve arranged in said openingto form the core therein. The pattern can be lifted from the core-forming sleeve, leaving the latter in the mold. This sleeve is preferably made of segmental sections, separable from each other, so they can be easily removed from the core after the pattern has been drawn from the mold. V 7

With the foregoing and other objects in view the invention comprises the novel construction, combination and arrangement of parts hereinafter more specifically described and illustrated in the accompanying drawings wherein is shown the preferred embodiment of the invention; however, it is to be understood that the invention comprehends changes, variations and modifications which com'e'within the scope of the claims hereunto appended.

Figure I is a vertical section of a flask,

Specification'of Letters Patent. 7 Patented M31311, 1919,

Application filed September 10, 1917. Serial No. 190,486. 7

showing a pattern provided with a coreforming device constructed in accordance with my invention.

Fig. II is an enlarged fragmentary plan view, partly in section, showing the central portion of the pattern and the core-forming device arranged therein.

F ig..III is a vertical section illustrating the parts shown in Fig. II.

The flask herein shown comprises a drag l, a bottom board 2, a cope 3 provided with a basin 4 into which the molten metal is poured, and gates 5 through which the metal flows from the basin to the mold. A chill ring 6 is arranged between the cope and the drag.

A designates a. pattern, preferably made of wood, the pattern shown being used in making car wheels. A tapered metal sleeve 7 forms a lining for a core receiving opening at the center of the pattern, said sleeve being permanently secured to the wooden pattern. This tapered sleeve is larger in diameter at the bottom than at the top, so that the pattern can be readily lifted from the core-forming device, which will be presently described. 8-designates a sheet metal web closing the top of the core-receiving opening at the center of the pattern. The annular margin of the web 8 is arranged between rings 9 and 10 and secured to the pattern by means of screws 12, which pass through said rings.

B designates a core-forming device preferably consisting of two semi-cylindrical sections 13 abutting. againsteach other at the points indicated by 14 in Fig. II. The internal diameter of the core-forming sleeve may be uniform throughout the entire length of the sleeve, and the sleeve sections 13 may be separated from each other and removed from the core after the pattern has been removed from the mold. Each sleeve section 13 is provided on its outer face with tapered ribs 15, which engage the inner face'of the tapered lining 7. The lower edge of each sleeve section 13 is widened, or flanged outwardly, as shown at 16, to engage the relatively large lower margin of the lining 7. The upper edge of each sleeve section 13 is fitted to the sheet metal web 8 at the top of the core-receiving opening, the lower edge being flush with the bottom of the pattern and firmly fitted to the lining 7 Web 8. The parts are thus secured to,

gether in such a manner that'the pattern can be readily lifted from the core-forming sleeve B, and thereafter said sleeve may be 7 easily removed from the core by moving the sleeve sections 13 away from each other. By splitting the sleeve longitudinally to form the two segmental sections 13, and by combining these sections with a pattern asv herein shown, a highly desirable core can be made of green sand at a very low cost, thereby entirely eliminating the labor and expense due to the making and handling of dry sand cores. The pattern having the tapered core-receiving opening can be very easily removed from the sectional core-forming sleeve, and the latter can be easily and quickly removed from the core.

I claim:

1. A car wheel pattern provided with a central core-receiving opening, a sheet metal web closing the top of said corereceiving opning, a core-forming sleeve arranged in said opening and extending from said sheet metal web to the bottom of the opening, the internal diameter of said coreforming sleeve being uniform approximately throughout the length of the sleeve and said sleeve being split longitudinally so that it can be readily removed from the core, said core forming sleeve being removably fitted to the pattern and the parts being so formed that the pattern can be readily lifted from 7 said sleeve;

2. A; car Wheel pattern provided with a separable from the pattern and separable from each other so they can be readily removed from the core, the wall of said cen; tral core-receiving opening being tapered to allow the pattern to be readily lifted from said sectional core receiving sleeve, and said'sections beingwidened at their lower margins to engage the relatively large lower margin of said wall.

3. A pattern provided with a core-receiving opening, a closure for the top of said 1 core-receiving opening, said opening being open at the bottom to receive the sand, and

a core-forming sleeve arranged in said opening and extending from said closure to the bottom of the opening, said coreforming sleeve being split longitudinally so that it can be readily removed from the core, said core-forming sleeve being removably fitted to the pattern and the parts being so formed that the pattern can be readily lifted from-said sleeve. 7

In testimony that I claim the foregoing I hereunto afiix my signature.

' FRED GAISLER.

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

Washington, D. G. V

Images