Year: 1889

page_text: We, SAMUEL HATT, of No. 86 St. Antoine Street, in the City of Montreal, Quebec,
Canada, Gentleman, and GEORGE SANDERSON, of 1129 Dorchester Street, Montreal,
aforesaid, Gentleman, do hereby declare the nature of this invention and in what
manner the same is to be performed to be particularly described and ascertained in
and by the following statement :-
This invention has reference to improvements in the construction of brake shoes
chiefly used for the brakes of the wheels of railway cars, to provide the same in a
better form than the brake shoes at present in use.
Heretofore brake shoes have been formed with their surfaces which bear on the
wheel composed partly of hard or chilled metal and partly of soft metal; the hardened
or chilled metal portion causing the shoe to wear very much longer than if made
entirely of soft metal, while the soft portion of the surface gives a good hold on the
wheel which would not be the case if the whole surface were made of chilled
metal.
The said brake shoes heretofore in use have been formed by placing in a mould
pieces of hard metal, steel &c. so situated that when the shoe is cast in the mould
the said pieces of hard metal steel &c. will be situated in the wearing surface of the
shoe. This is objectionable because the running of the molten metal in the mould
and the cooling of the two together have a softening effect upon the hard metal
steel &c. placed in the mould.
Another way heretofore in use has been to form a brake shoe with alternate
portions of its wearing face of soft and chilled metal.
This is objectionable because by so forming the brake shoe, the chill cannot be
made very deep or to extend through the thickness of the brake shoe, so that long
before the brake shoe is worn out it becomes a brake shoe of soft metal, as the whole
hardened or chilled portion is worn away. Also the mould in which such shoes are
cast must necessarily be complicated in construction.
By the invention about to be described a shoe is formed having a chilled portion
extending the whole depth that the shoe will be worn, or the entire thickness of the
brake shoe if desired, these may be produced with a simple form of mould.

page_text: In the drawings hereunto annexed similar letters of reference indicate like parts,
and Fig. 1 is a side elevation of a brake shoe, and also of a cover used in casting the
chilled or hard core thereof. Fig. 2 is an elevation of the face of the brake shoe
shewn in Fig. 1. Fig. 3 shews a modification of the configuration of the chilled or
hard core and shoe. Fig. 4 is a cross section taken on line & Fig. 2 shewing also the
cross section of the cover D in place therewith. Fig. 5 is a cross section taken on
line y Fig. 2. Fig. 6 is a side elevation of a first modification of a brake shoe cast
integral. Fig. 7 is an elevation of the face of the shoe shewn in Fig. 6. Fig. 8 is
an illustration of the manner of forming the mould and casting the shoe shewn in
Fig. 6, the section being on a larger scale. Figs. 9, 10 and 11 are respectively a
side, face and end elevation of a second modification of a brake shoe cast integral.
Figs. 12, 13 and 14 are respectively a side, face and end elevation of a third modifica-
tion of a brake shoe cast integral. Figs. 15 and 16 are diagrams illustrating further
modifications of the brake shoe cast integral.
The brake-shoes about to be described are cast in moulds constructed to give them
the required configuration and dimensions as at present in use.
As illustrated in Figs. 1 to 5 inclusively A, is the body of the shoe; B, is the
ordinary projection by which the shoe is attached to the head of the brake; or any
other desired means may be used for this purpose. The body A, is moulded and cast
in sand (so far) in an ordinary way but it is provided with a dovetailed recess F, in
which is cast the chilled or hard core I, of the shoe. This dovetailed groove may be
of a great variety of configurations. As shown in Fig. 2, it is very much the form
of an X, and in Fig. 3, it is of a serpentine configuration; from these a general idea
may be formed of some of the varieties of configuration which may be used for the
said core.
D is a cover made to agree with the form of the face of the shoe; E is a projection
agreeing with the groove F, and so arranged that when the cover D, and body of the
shoe are placed together, as shewn by Fig. 4, the projection E, fills a small portion of
the groove F; this is also indicated by the dotted line 1 in Fig. 1.
After the cover D, and body A have been arranged together as described, and
secured, suitable metal for chilling or hardening is poured into the groove F, through
a git H, the body A and cover D being cold at the time will cause the chilling or
hardening of the metal core I.
The object of providing the projection E, to the cover D, is that the brake-shoe
when finished may have the core I, with its surface sunk a little below the bearing
face 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.
In the modification shown by Figs. 6, 7 and 8, the shoe is cast integral in a mould
constructed to give it the desired configuration and dimensions: this mould is formed
with its part A¹, of ordinary moulding sand for casting ordinary soft metal so that
the face of the shoe when cast may be of soft metal, all over for a small amount of
thickness in order to allow it to wear to the tread of the wheel before the chilled
portions E come in contact therewith. The continuation D¹, of the mould is formed
in the ordinary manner to cause a chilled or hard marginal part E¹, while the central
part F is of soft or unchilled metal.
In the modification shown by Figs. 9, 10 and 11, the arrangement is the same as in
Figs. 6, 7 and 8, only that in this case the chilled or hardened marginal part El only
extends on one side and partly on each of the ends of the shoe, thus leaving a side G¹,
of soft metal to come in contact with the throat of the wheel, which "throat" is
that portion of the tread of the wheel which is adjacent to the flange. Brake shoes
made in this form have the advantage that they are without any hard part to come in
contact with and cut the "throat" of the wheel.
In the modification shown by Figs. 12, 13 and 14 the construction is the same as in
Figs. 9 10 and 11, only that in this case an additional flange A³ is provided to agree
with the configuration of the flange of the wheel upon which it is arranged to bear.
In the modification shewn in Fig. 15, the brake shoe is cast integral with a chilled
inner part A (as shewn this is rectangular but it may be of any desired ordinary

page_text: configuration) and an outer soft marginal part B extending on both its sides and ends,
while in Fig. 16 is shewn a brake shoe having the said soft marginal part extending
on one side only, and both ends of the brake shoe.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed we declare that what we
claim is:-
1. A brake-shoe having a grooved body of soft metal with a chilled or hardened
core cast in the groove substantially as described.
2. A brake-shoe, cast integral having a marginal part of chilled or hard metal,
embracing a soft portion substantially as described.
3. A brake-shoe cast integral having a marginal part of soft metal embracing a
chilled or hardened portion of metal substantially as described.
ABEL & IMRAY,
Agents for the Applicants.