US366113A - And james jamieson - Google Patents

Description

(No Model.)

W. J. KEEP & J. JAMIESON. MEANS FOR FORMING HINGE PIN AND OTHER HOLES.

1111366113. Patented July 5, 188 7.

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UNIT D STATES PATENT OFFICE,

"WILLIAM J. KEEP, OF DETROIT, MICHIGAN, AND JAMES J AMIESON, OF HAMILTON, ONTARIO, CANADA.

MEANS FOR FORMING HINGE-PIN AND OTHER HOLES.

SPECIFICATION forming part of Letters Patent No. 366,113, dated July 5, 1887.

Application filed April 28, 1886. Serial No. 200,426. (No model) worth and Province of Ontario, Canada, have invented new and useful Improvements in Means for Forming Hinge-Pin and other Holes; and we do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form a part of this specification.

Our invention relates to a new andimproved means for forming the holes in hingeknuckles and other places by the process of casting; and the object of our invention is to save the labor and expense of drilling holes--such as pin-holes in cast-metal hinge'knuckles, especially the knuckles cast upon stove-doors and stove-door frames, for hanging the parts together by means of a loose pin inserted into the pin-holes of two coacting knuckles, as is the usual manner to form such hinges on stoves.

In the manufacture of stoves it is veryimportant to form the hinges very accurately, as stovedoors are required to make what is called gas-tight joints, and, moreover, all the like parts have to be interchangeable.

Previous to our invention it had been pro-- posed to use a slotted chill and pin for the pur pose of making such pinholes; but this was objectionable,for the following reasons,among others: The chill left the knuckle or lug in1- perfect, as it chilled the iron to a considerable extent, and, moreover, with this plan the pin and chill each required a separate handling by the molder, and were liable to get out of place in ramming the sand. Chills are also very difficult to make smooth inside, so that they will come off easily, and are therefore difficult to get off from the hot castings, and are often lost and mixed with the sand. Moreover, owing to the shifting of the pin or chill in the sand, the holes were often slightly out of place, and as the metal became chilled it was impossible to file them, even if that were commercially practicable. This is very 0bjectionable, as the least variation in the position of the hole renders the casting a total loss. Attempts have been made to overcome these difficulties by the use of a sheetmetal hood, and a thin tube, to be held in place by the hood. This, however, was found to be objectionable also, inasmuch as theincoming metal was apt to wash the light tube out of position, and, moreover, when the molten iron surrounded the tube it made the metal of thelatter so soft that it would be pressed inward,

and, irrespective of this, when the metal cooled the shrinkage would make the holein. the tube smaller, and the size and shape of the hole would thus vary. If the shrinkages were regular, this might have made no difference; but it was found impossible to depend on any amount of regularity in the shrinking, as, owing to the varying thickness of the metal of the tube, the shrinking varied considerably. This irregularity in the size of the hole is a very serious matter, because the pin must be driven in such a manner that it will not fall out, and yet if the holeis one four thousandths of an inch too small the driving in of the pin will split the lug and render the casting useless. Another difficulty was that the tube required filling,which is an extra expense and trouble. To overcome these various difliculties, we found, after considerable experimenting with the above mentioned plans and much loss resulting therefrom, that if we used a thin sheet hood having perforations sufficiently small to receive and tightly hold a metal pin that projected through the sides of the hood, the difficulties connected with the plans above referred to were overcome. As the pin was held fast by being tightly fitted into the hood, the two parts required but one handling by the molder, and, as the metal of the hood is very thin, it did not chill the metal as it ran in, but, on the contrary, the inner surface of the hood fused and united with the incoming metal. Asthe pin projected through the hood and was thus firmly held, it was not likely to get out of place by the ramming in of the sand, and, as the end of the pin was firmly held in place by the sand, it also held the hood in place, and thus both hood and pin were prevented from incoming metal.

It must be remembered that it is necessary IOO . place.

- especially necessary when the hood and pin or tube are in the upper or cope side of the mold, as they are likely to fall by their own weight if not securely held by the pin projecting into the sand, as in ourimprovement.

In view of the state of the art, as above set forth, we consider our invention to consist of a thin metallic hood having, perforations to securely hold a pin projecting through the sides of said hood, in contradi'stinction to a slotted chill and pin or toa thin metal hood and tube.

Referring now to the drawings, Figure 1 represents in perspective a section of stoveplate pattern with a hinge-knuckle arranged to carry out our invention. Fig. 2 is a perspective view of the hood. Fig. 3 is a perspective of the hood with the pin in place. Fig. 4 is a sectional elevation of the hingeknuckle pattern in Fig. 1 as prepared for molding. Fig. 5 is a section of a mold prepared for casting the hinge-knuckle in accordance with our invention. Fig. 6 is a perspective View of a cast hinge-knuckle ready for use. Fig. 7 is a perspective view of the catch of a stove-door and a hood to be used in connection therewith. Fig. Sis a similar view of a lug and a blank from which its hood is formed.

A represents a portion of a stove-plate pattern provided with the hinge-knuckle pattern B, to be used in casting aknuckle with around pin-hole. To this end the pattern is cut away so as to form a recess, a, which has tapering sides and arounding bottom, 6, as shown. Into this recess is placed before molding a round pin, 0, of sufficient length to project with one or both ends from the sides of the recess, as shown in Fig. 5. The pin 0 has to fit accurately the rounding bottom of the recess. It is of suitable material to present'a smooth surface and resist, without melting or disintegration, the heat of the molten metal, wroughtiron or steel having been found suitable for our purpose in making stove-castings.

D is a support or hood, made of sheet metal, with the ends bent and perforated to form the holes a, in which the pin may be supported, as shown in Fig. 3. This support is placed over the recess in the knuckle, so as to hold the pin 0, as shown in Fig.4. In this position it forms a hood over the recess a, inclosing it tightly upon all sides, so that when the pattern is now molded in the sand in the usual manner not a particle of sand can'find its way into said recess.

When the pattern is withdrawn from the drag, the pin 0 will be left perfectly undisturbed and firmly supported in its proper position by the hood, which latter rests on the This holding of the hood in place is mold, as shown in Fig. 5. The mold being properly completed for casting and the molten metal poured into it inthe usual manner, it will flow around the cylindrical pin and form a perfect cylindrical pin-hole in the exact position required, and after the casting is removed from the mold the pin can readily be driven out of the pin-hole.

' The essential requirements of the hood D are to support the pin 0 and hold it securely in its position in the mold, and to prevent the sand in molding from filling into the cavity around the pin; but among thedifferent forms The iron pin or chill is made to protrude I ing the pin therein the hood and the pin engaged'with each other may be prepared ready I for use.

Our invention is not alone applicable to the casting of pin-holes in hinge-knuckles, but it will be found of great practical use for casting holes in stove catches, lugs, &c., where such holes may be used for other purposes; and

Figs. 7 and 8 are intended to illustrate such general use.

In Fig. 7, E is a catch of a stove-door, whic it is desirable to cast with ahole, f. This may be easily done by constructing a hood of tin such as the hood F, shown alongside of the aforementioned figure, which is of corresponding shape and size with the catch, and supports the pin G. This hood, being used in connection with the pattern, of suitable form, in the manner above described, so as to permit of molding the catch and withdrawing the pattern, leaving the hood in position in the mold, will after casting form an integral part of the catch and the pin can be readily driven out.v

In Fig. 8, G represents a lug, which it is desired to east with a hole, h. For this purpose a suitable hood may be readily formed by striking up the metal plate H of the form shown alongside. This plate can be easily bent into the required shape to form a hood and support the pin for casting the hole.

The general application of our invention and the manner to proceed in other instances will now readily appear, and the desirability of having the hoods with the pin secured therein supplied by the trade for such parts of the standard form and size as hinge-knuckles, stove-catches, 850., will be conceded.

We are aware of the Patents Nos. 102,983 and 317,498, and niake'no claim to anything shown therein, as we consider our invention essentially different from the subjectmatter 5 of said patents.

secured in the hood and having projecting ends, substantially as described.

3. The combination, with a pattern, B, having guiding-recess a, of a removable. solid cy- 2o lindrical core, 0, and a core-carrier, D, hav ing oppositely located circular openings 0, which areadapted to hold the core 0 snugly in said carrier and through which the ends of said core project, substantially as and for the 2 5 purpose specified.

WILLIAM J. KEEP. JAMES J AMIESON.

Witnesses:

JOHN M. DWYER, J. FRED MOORE.

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