US649640A - Molding apparatus. - Google Patents

Description

Patented May I5, i900.

C. HERMAN.

MULDING APPARATUS.

(Application led Sent, 19, 1898.)

3 Sheets-Sheet 2.

(No Model.)

WITNESSES:

Att' y.

No. 649,640. Patented May I5, |900. C. HERMAN.

HOLDING APPARATUS.

(Application led Sept. 19, 189B.) (No Model.) 3 Shasta-Sheet 3.

.L a n.

WITNESSIB:

UNTTE STATES v PATENT OFFICE.

CHARLES HERMAN, OF ALLEGHENY, PENNSYLVANIA, ASSIGNOR TO THE KINZER t JONES MANUFACTURING COMPANY, OF PITTSBURG, PENN- S Y LVANI A SPECFICATION forming part of Letters Patent No. 649,640, dated May 15, 1900.

Application filed September 19, 1898. Serial No. 691,288. (No model.)

To (1J/ whom it may concern:

Beit known that l, CHARLES HERMAN, a citizen of the United States, residing at Allegheny, in the county of Allegheny and State of Pennsylvania, haveinvented or discovered certain new and useful Impro vementsin Molding Apparatus, of which improvements thc following is a specification.

The invention described herein relates to certain improvements in apparatus for forming molds for the formation ot the shells or boxes on composite brake-shoes-t'- e., brakeshoes consisting of a case or shell inclosinga body formed of a different material. 1n order that the body portion of the shoe maybe held firmly in position under all conditions of use, the inner walls are inclined so as to form a dovetailed recess orpoeket for the body.

The object of the present invention is to provide for the proper shaping of the side walls of the core of the mold and the easy withdrawal of the forming portion of the pattern from the mold.

The invention is hereinafter more fully described and claimed.

In the accompanying drawings, forming a part of this speciiication, Figure 1 is a plan View showing two of my improved patterns with their moldboard in position on a halfiiask molding. Figs. 2 and 3 are sectional elevations of the same, the planes of sections being indicated, respectively, by the lines II 1I and III III, Fig. 1. Fig. 4 is a sectional elevation on the same plane as Fig. 2, showing the half-dash inverted, the moldboard and a portion of the pattern removed, and the parts of the other portions of the pattern adjusted for removal. Fig. 5 is adetail view of a portion ot the pattern on an enlarged scale. Figs. 6 and 7 are views similar to Figs. 2 and 3, illustrating modifications of the pattern; and Fig. 8 is a sectional elevation showing half of completed mold with the moldboard and pattern partially withdrawn.

ln the practice of my invention the boX- like portion 1 of the pattern, which is designed to shape the outer wall of the matrix of the mold, passes through the moldboard 2 and may or may not be secured thereto. This moldboard is provided on two opposite edges with perforated lugs 3 for the reception of the dowel-pins of the half-flask 4. and with handles 3. A bar 5 is secured longitudinally across the lower outer open end of the box portion for supporting the bottom plate 6 of the core-box portion of the pattern, which consists of the bottom plate G and the side and end plates 7 and 8. As clearly shown in Figs. 2 and 3, the side and end plates rest when in operative position against the inner walls of the box portion 1 of the pattern and have their inner surfaces properly shaped to impart the desired inclination to the side and end walls of the core a of the mold. It is preferred to form,these side and end Walls 7 and 8 of comparativelythin sheet metal strips and to impart the desired shape or contour to their .inner walls by bending the strips longitudinally. In order to withdraw the coreboX portion of the pattern Jfrom the mold, the side and end plates 7 and 8 are so attached to the bottom plate as to permit of their being shifted away from the sides and ends of the core a. y

In the manufacture of some forms of brakeshoes the matrix for the sides and ends of the shoe-shells is formed entirely with one part of the flask, as shown in Figs. 1 to 4, inclusive. In a mold of such construction the space b between the outer walls of the matrix and the walls of the core a is so narrow that the plates 7 and 8 cannot be swung out on the arcs of circles having centers coinciding with the edges of the bottom plate 6, but should be heldin approximate parallelism with the sides and ends of the core a while being shifted. To this end the plates are provided with one or more pins 9 at or adjacent to their upper edges, the heads of said pins fitting loosely within sockets 10, formed in arms l1 and 12 a distance above their lower ends. These arms are pivotally mounted between lugs 13 on the bottom plate 6. The inward movelugs 13.

9 are made sufficiently long to permit of an oscillatory movement of the plates 7 and 8 on the ends cof the arms 11 and 12 as fulcra when the plates are moved outwardly by the shifting of the arms on their pivotal su pports. If the plates were rigidly secured to the arms, their outer edges would have a greater range of movement than their innervedges, so that if the inner edges be shifted su fticiently far to clear the core a their outer edges would strike against the outer Wall of the space b. The loose connection of the plates to the arms above the ends of the latter permits of such an oscillation of the plates that their upper and lower edges have an approximately-equal outward movement from the core.

In forming a mold the moldboard is arranged with the pattern projecting upwardly, and the half-flask is placed in position thereon, as shown in Figs. 1, 2, and 3. After the sand has been rammed in the flask the latter, with the inoldboard in position, is turned over, as shown in Fig. 4. The moldboard and the box portion 1 of the pattern are then Withdrawn, leaving the core-box portion of the pattern in position. The molder then shifts the plates 7 and 8 away from the core by pressing the upper ends of the arms inwardly with his fingers, thereby permitting of the withdrawal of the core-box portion of the pattern. I

In the manufacture of some forms of brakeshoe shells the core a is formed in one halfflask, as shown in Fig. 8, and the female portion of the matrix in the otherhalf-flask. As

the cores project up clear of any other portion of the mold, there is ample room for the outward movement of the sides and ends of core-forming box. For the formation of this style of mold the moldboard is made in the form of a frame 2a, having bars 5 secured across one end for supporting the core-box during the formation of the mold. rlhe coreboX consists of the bottom plate G and the side and end plates '72M and 8, the latter being pivotally connected to the edges of the bottom plate. During the molding operation the moldboard and core-box are arranged as shown in Figs. 6 and 7 and the half-flask adjusted in proper position in the former. After the sand has been rammed the flask, moldboard, and core-box are inverted and the moldboard and core-box are raised. During a portion of the movement of the moldboard the core-box is not shifted; but as soon as the sides of the moldboard, which retain the side and end plates of the core-box in position during the ramming of the sand, are -raised clear of the core-box shoulders 15 on the moldboard will strike against lugs 16 on the side and end plates 7Zt and 8, and thereby cause them to swing out away from the core sufficiently far to permit of the removal of the core-box.

As it is generally customary to form two matrices in one flask, the improvements are shown in duplicate; but it will be readily understood by those skilled in the art that the improvements can be readily adapted to the formation of one or any desired number of matrices.

It will be observed that in both forms of apparatus the side and end plates of the coreboX are held in operative relation to each other by an inclosed shell or frame, which in one' construction-t'. e., that shown in Figs. l to 5, inclusive-is formed by the pattern 1. In the construction shown in Figs. 6, '7, and 8 this retaining frame or shell is formed by the moldboard 2a.

I claim herein as my invention- 1. The combination of an apertured moldboard, a core-box consisting of a bottom plate and side and end plates, and arranged in the opening in the moldboard, and means for holding said plates in operative relation to each other during the molding operation, substantiallyas set forth.

2. The combination of an apertured moldboard,a box-like pattern arranged in the opening in the moldboard, and a core-box consisting of a bottom and side and end plates, the side and end plates being movably connected to the bottom plate, said parts being held in operative relation to' each other by the boxpattern, substantially as set forth.

3. A core-box having in combinationa bottom plate and side and end plates carried by the bottom plate, and means whereby the innerand outer edges of each of said plates may be simultaneously shifted an approximatelyeq ual distance, substantially as set forth.

4:. A core-box having in combination a bottom plate, arms pivotally mounted on said plate and side and end plates loosely connected to said arms at points distant from their ends, substantially as set forth.

In testimony whereof I have hereunto set my hand.

CHARLES HERMAN.

lVitnesses:

DARWIN S. WoLcoTr, F. E. GAITHER.

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