US 399665 A
Description (OCR text may contain errors)
Patented Mar. 19, 1889,
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NITED STATES PATENT Crrrcn.
SAMUEL HATT, OF MONTREAL, QUEBEC, CANADA, ASSIGNOR TO GEORGE. SANDERSON, OF SAME PLACE.
SPECIFICATION forming part of Letters Patent No. 399,665, dated March 19, 1889.
Application filed July 26, 1888. Serial No. 281,106. (No model.)
To aZZ whom it may concern.-
Be it known that I, SAMUEL HATT, gentleman, of the city of Montreal, in the district of Montreal, Province of Quebec, Canada, have invented new and useful Improvements in Brake-Shoes; and I do hereby declare that the following is a full, clear, and exact description of the same.
My invention relates to an improved construction of brake-shoe, chiefly used for the wheels of railway-cars, formed partly of hard orchilled metal and partly of soft metal, the soft portion giving the shoe a good hold upon the wheel and the hard port-ion causing the shoe to wear much longer than if of soft metal throughout. a
The object of my invention is to form a continuous core of hard metal within the body of the shoe. This enables the core to be made of a superior quality of metal, while the body may be made of ordinary or inferior metal.
In the drawings hereunto annexed similar letters of reference indicate like parts.
Figure lis a side elevation of a brake-shoe and also of a cover used in casting the chilled or hard core thereof. Fig. 2 is a view of the face of the brake-shoe shown in Fig. 1. Fig. 3 is a modification of the configuration of the chilled or hard core. Fig. 4c is a cross-secti0n taken on line 00, Fig. 2, showing also the cover I) in place therewith. Fig. 5 is a cross-section taken on line 12 Fig. 2.
A is the body of the shoe, which will be of any desired form, as in ordinary use.
B is the ordinary projection by which the shoe is attached to the head of the brake; or any other desired means maybe used for this purpose.
The body A will be molded and cast in sand (so far) in the ordinary way; but in so molding it it will be provided with a dovetailed recess, F, in which will be cast the chilled or hard core of the shoe. The dovetailed groove F may be of a great variety of configurations. As shown in Fig. 2 it is Very much the form of an X, and as shown in Fig. 3 it is of a serpentine form. From these a general idea will be formed of some of the varieties of configurations which may be used; but it will be understood that whatever the configuration may be the groove will always be dovetailed, as shown at C in Figs. 4 and'5.
D is a cover made to agree with the form of the face of the shoe. This is provided with a projection, E, agreeing with the configuration of the groove in the body of the shoe, and so arranged that when the cover D and body of the shoe are placed together, as shown in Fig. 4, the projection E will fill a small portion of the groove F. This may also be said to be indicated by the dotted line 1 in Fig. 1.
After the cover D and body A have been arranged and secured together, as described, suitable vmetal for chilling or hardening is poured into the groove F through a pourhole, I'I, formed in any desired or suitable position in the body of the shoe,which, being cold at that time, will cause the chilling or hardening of the metal. Thus a shoe is formed having a soft body and a hard core, I.
The object of providing the projection E to the cover D is, that the brake-shoe, when finished, will have the core I with its outer surface sunk below the bearing-surface of the body A, and thus enable the shoe to wear down to the shape of the car-wheel before the wheel comes in contact with the hard core I.
hat I claim, and wish to secure, is as follows:
The combination of the body A, castwith a dovetailed groove, F, with a core of chilled metal, I, cast within said groove F, the whole substantially as described.
CHARLES G. O. SIMPSON, G. DUPUIS.