IMPROVEMENTS IN BRAKE SHOES
Year: 1885

page_text: I ALFRED JULIUS BOULT of 323 High Holborn in the county of Middlesex,
Engineer do hereby declare the nature of this invention for "IMPROVEMENTS IN
BRAKE SHOES" (a communication from John Joseph Lappin of Toronto, in the
Dominion of Canada, Gentleman) and in what manner the saine is to be
performed, to be particularly described and ascertained in and by the following
statement:
This invention relates to that class of brake shoes which are constructed specially
to ensure durability in the wear of the shoe, and to brake the cars without skidding
the wheels.
This invention specially relates to a brake shoe for which the said John Joseph
Lappin obtained a patent in Canada N° 17,213 July 11th 1883. And in Great
Britain N° 2,056 January 24 1884 And in the United States N° 292,827
February 5th 1884 and the present application is for an invention which is an
improvement on the aforesaid Patents.
The improvement consists in its being more simple in construction and in the
manufacture thereof than the shoe forming the subject of the above mentioned
patents. It is equally efficacious in braking the cars without skidding the wheels,
and also equal in durability to the shoe forming the subject of the former patents,
herein before referred to.
In the accompanying drawings:-
Figure 1. Is a side view of this shoe.
Figure 2. Is an end view of the same.
Figure 3. Is a transverse section through the line a. b. in figure 1.
Figure 4. Is a face view of the shoe.
Figure 6. Is a side view of the same.
Figure 7. Is a top view of the chill.
Figure 8. Is a modification of the shoe.
Figure 5. is a face view of the chill and
Similar letters of reference indicate the same parts in all the views and in this
Specification.
A. Represents the Shoe; B, the chilled parts in the face of the same; C, the
unchilled parts; D, the Chill pattern, having three chills in the face of the same;
d, the projections which pass up the side of the wooden pattern of the shoe in the
mould; d, the faces of the pattern chill; d, the edge of the chills, and d³, the top
which connects the chills, and may be used as a handle for lifting the same when
placing the chills in the face of the shoe pattern in the sand.

page_text: Referring to Figures 1. 2. 3. It will be seen that the soft portions C, in the face
of the shoe, project out from the chilled portions B therein, and referring to
Figure 4, it will be seen that there are six chilled parts in the face of the shoe, and
are so located therein, that the chilled parts from each side of the shoe will reach
into and somewhat beyond a longitudinal centre line of the shoe, so that the chilled
parts will act upon the full face of the wheel when applied thereon. It will also
be seen that each chilled part in the face of the shoe is opposite to an unchilled
part thereby providing a continuous waved rib of soft metal running along the
middle of the shoe and thereby strengthening the same. It will further be seen
that the soft projecting part C, will wear down to a perfect fit on the wheel before
the chilled parts come in contact therewith, and thereby protecting the shoe.
The chill pattern being made with three chills connected together, so that the
said three chills can be handled and put in the mould in the same time that
a single chill can be so handled; considerably reduces the labour in the moulding
of the shoe.
The operation of moulding the shoe in the Foundry is as follows:-
The shoe pattern is laid down on its back on a follow board, the chills are then
placed in the face of the pattern, a mould box is now placed on the follow board
and sand filled therein, and rammed closely around the pattern and the chills and
filled to the top of the box closely packed and smoothed off, when a bottom board
is placed thereon, and clamped and turned over. The follow board is now removed,
and the Cope or upper half of the box is now placed on the lower half and filled
with sand, and the gate for the molten metal-formed in the ramming thereof.
The gate pier is now removed and the Cope or upper half of the box taken off;
the wooden pattern of the shoe is now carefully removed from the sand, the chills
remaining therein with their faces uppermost. The mould being now complete ;
the Cope, or upper half of the box is now replaced in position and clamped. The
whole being now ready for the pouring of the molten metal therein.
Referring to the Figures 5. 6. 7. which are separate views of the chill pattern D,
having three distinct chills connected in one piece, each chill having its projection d,
which passes up on the side of the wooden pattern of the shoe, when in the sand.
The face of each chill is marked d', the outer edge thereof d², and the top, or
handle d³, which chill D, with the preceding description of the operation in the
moulding of the shoe. The process of the manufacture is clearly described and
illustrated. In figure 4, the dotted lines around the chilled part B, represent the
extent of Chilled surface on the face of the shoe.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is
First: A Brake Shoe A with chilled parts B, on each side in the face of the
shoe; each chilled part B, being opposite to an unchilled part C. the soft
metal C, being on each side and around the inner edge of the chilled parts B,
thereby providing a continuous waved rib of soft metal running along the
middle of the shoe, and thereby strengthening the same, substantially as shown
and described.
Second. The modification substantially as shown in Figure 8.