Year: 1893

page_text: UCING
United States of America),
Date of Application (in United Kingdom), 21st June, 1893
Complete Specification Left, 20th Mar., 1894-Accepted, 23rd June, 1894
Date of Application (in United Kingdom), 21st June, 1893
Complete Specification Left, 20th Mar., 1894-Accepted, 23rd June, 1894
пиртомещению
1, WILLIAM WIRT WHITCOMB, residing in Boston, County of Suffolk, and
State of Massachusetts, United States of America, Merchant, do hereby declare
the nature of this invention to be as follows:-
This invention relates to clutches or brake-shoes especially adapted among other
things, to be used on railway cars, the wearing surfaces of such shoes being
composed of metallic portions which may be cast or wrought iron or steel as desired,
and preferably non-metallic portions which may be compact masses of wood or
other material preferably in the form of plugs, which are fitted into sockets or
holes in the said metallic portion.
This invention has for its object to provide a brake-shoe, having a composite
wearing surface of metallic and preferably non-metallic substances of such con-
struction as to render it especially applicable to brake heads commonly in use, and
more particularly to brake heads known as master car-builders' brake-heads and
to replace, when worn, the metal shoe now used with such heads.
According to this invention, the brake-shoe is provided with preferably a series
of holes or sockets, which may extend through or partially through the said shoe,
and into which the solid preferably non-metallic portions, for example wooden
plugs are inserted, and firmly secured therein by means of a locking device or key,
preferably wedge-shaped, which becomes embedded in the rear end of the wooden
or other solid plug, and which firmly secures the said plug in its socket or hole
against displacement by shrinkage, jar, or like causes. The locking device referred
to, is preferably cast integral with the metallic portion of the brake shoe and the
ear portion of the hole or socket is enlarged, so that, when the wooden plug is
driven into the socket the said plug is split or distended at its rear end and thus
fills the enlargement of the said socket, thereby preventing the said plug from
working forward out of its socket, when in practical operation.
In one arrangement the brake head provided with arms and lugs or ears is and
may be of any usual well known construction but is preferably of the construction
known as the master car builders' brake-head, and has secured to it, it may be by
a spline, a brake-shoe preferably consisting of a solid portion of metal, preferably
cast iron, having on its back a lug or ear fitted between the lugs or ears on the
brake head and secured thereto by the above mentioned spline. The brake-shoe
is provided with a number of holes or sockets preferably enlarged at their rear
ends and which, extend partially through the shoe. The sockets or holes have
inserted into them a mass of solid material, preferably non-metallic and preferably
wooden plugs which are made to tightly fit the said sockets, so that they require
to be driven into the said sockets. The non-metallic or wooden plugs, are firmly
secured in their sockets or holes by locking devices or keys, preferably wedges
which may be cast integral with the metallic portion of the brake-shoe or which
may be separate therefrom, and first slightly driven into the wooden plug and

page_text: thereafter, farther driven into the said plug when the latter is driven into its
socket. The wedges spread the rear end of the plug, filling the enlarged rear
portion of the sockets or holes and thereby firmly securing the said plug in ite
socket against detachment by shrinkage, jar, etc. The wooden plugs are made
of such length that when driven home in their sockets, their front ends are
practically flush with the face of the metallic portion of the shoe. It is preferable
to construct the shoe with the holes or sockets extending only partially through
the metallic portion of the shoe, the solid portion of the shoe being preferably
provided with a series of small holes, grooves or channels arranged to form heat
current interrupting passages by which the continuity of the current of heat in
the solid rear metallic portion of the shoe is broken up, thereby obviating the
deleterious effects produced by the overheating of the brake-shoes. However
some or all of the said holes or sockets may extend entirely through the metallic
portion of the shoe, in which case the plugs are secured by independent wedges or
keys. If desired the enlargement of the socket or hole may be of any desired
shape, as for instance, the enlargement may be made as an annular channel or
groove into which the plug is forced by the wedge or key. The form of key or
locking device by which the plug is firmly secured in its socket or hole may be
varied.
The plugs may if desired be made of a composition of metals or a metal which
is softer than the main metallic portion of the shoe, and this softer metal may be
cast into the sockets or holes about the locking device or key which will act to
retain or lock the soft metal plug in its socket.
Dated this 21st day of June 1893.
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.
I, WILLIAM WIRT WHITCOMB, residing in Boston County of Suffolk, and
State of Massachusetts, United States of America, Merchant, 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 relates to a clutch or brake-shoe, especially adapted, among
other things, to be used on railway cars. The brake-shoe referred to, has its
wearing surface composed of metallic and preferably non-metallic portions, and
which may be cast or wrought iron or steel, as desired, and wooden or other
non-metallic compact masses, preferably in the form of plugs, which are fitted into
sockets or holes in the said metallic portion.
My present invention has for its object to provide a brake-shoe, having a
composite wearing surface of metallic and preferably non-metallic substances of
such construction as to render it especially applicable to brake-heads commonly in
use, and more particularly to the master car builder's brake-head and to replace,
when worn, the metal shoe now used with such heads.
In accordance with my invention, the brake-shoe is provided with preferably a
series of holes or sockets, which may extend through or partially through the
said shoe, and into which the solid preferably non-metallic portions, preferably
wooden plugs, are inserted, and firmly secured therein by means of a locking
device or key, preferably wedge-shaped, which is, for the best results, embedded
in the rear end of the wooden or other solid non-metallic plug, and which firmly
secures the said plug in its socket or hole against displacement by shrinkage, jar, or
like causes.
The locking device referred to is preferably cast integral with the

page_text: metallic portion of the brake-shoe and, for the best results, the rear portion of
the hole or socket is enlarged, so that, when the wooden plug is driven into the
socket, the said plug is split or distended at its rear end to fill the enlargement of
the said socket, thereby preventing the said plug from working forward out of its
socket, when in practical operation.
The particular features in which my invention consists will be pointed out in the
claims at the end of this Specification.
Figure 1, is a side elevation of a master car builder's brake-head, provided with
a brake-shoe embodying my invention.
Fig. 2, a section on the line 2-2, Fig. 1.
Fig. 3, a section of a modified form of brake-shoe, the section being taken on
the line 3-3, Fig. 4.
Fig. 4 a rear side elevation of the modification shown in Fig. 3, and Fig. 5 a
modification to be referred to.
The brake-head A, provided with the arms a, a¹ and lugs or ears a² a³, is and
may be of any usual well known construction and more particularly the construction
known as the master car builder's brake-head. The brake-head A. has secured to
it, as by a spline a', a brake-shoe B preferably made as shown in Figs. 1 & 2,
and consisting of a solid portion of metal, preferably cast iron, having on its
back a lug or ear a fitted between the lugs or ears a² a³ and secured thereto by the
spline a. The brake-shoe B is provided preferably with a number of holes or
sockets b, preferably enlarged at their rear ends, as at 6', and which, as shown in
Figs. 1 & 2, extend but partially through the shoe. The sockets or holes have
inserted into them a mass of solid material, preferably non metallic and preferably
wooden plugs , which for the best results, are made to fit the said sockets
substantially tight, and require being driven into the said sockets.
The non
metallic or wooden plugs, are firmly secured in their sockets or holes by locking
devices or keys, preferably wedges 6 which may be cast integral with the metallic
portion of the brake-shoe or which may be separate therefrom, and first slightly
driven into the wooden plug and thereafter, farther driven into the said plug when
the latter is driven into its socket. The wedges be act to spread the rear end of
the plug and fill the enlarged rear portion of the sockets or holes, thereby firmly
securing the said plug in its socket against detachment, by shrinkage, jar, etc.
wooden plugs are made of such length that when driven home in their sockets,
their front ends are substantially flush with the face of the metallic portion of the
shoe. I prefer to construct the shoe as shown in Figs. 1 and 2, with the holes or
sockets extended but partially through the metallic portion of the shoe, and the
solid portion of the shoe is preferably provided with a series of small holes or
grooves or channels 68, to form heat current interrupting passages by which the
cont nuity of the current of heat in the solid rear metallic portion of the shoe
is broken up, thereby obviating the deleterious effects produced by the over-
heating of the brake-shoes.
The
I do not desire to limit my invention to the precise construction shown in
Figs. 1 & 2 as some or all of the said holes or openings may be extended entirely
through the metallic portion of the shoe.
In Fig. 4 some of the holes or sockets are represented as extended entirely
through the metal and the plugs are secured by independent wedges or keys, and
some are represented by dotted lines as extended but partially through the metal,
after the manner shown in Fig. 1. If desired, the enlargement of the socket or
hole may be of any desired shape, as for instance, as shown in Fig. 5, wherein
the enlargement made as an annular channel or groove c into which the non-
metallic plug is forced by the wedge or key. So also, I do not desire to limit my
invention to any particular form of key or locking device by which the plug is
firmly secured in its socket or hole.
The gist of my present invention consists of the key or locking device and
consequently, while I prefer to make the plugs 6 of non-metallic material, I do
not desire to limit my invention in this respect, as the said plugs may be made of a

page_text: composition of metals or a metal which is softer than the main metallic portion
of the shoe, and this softer metal may be cast into the sockets or holes about
the locking device or key which will act to retain or lock the soft metal plug in its
Bocket.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :
1. A composite brake-shoe consisting of a metallic portion having one or more
sockets or holes, non metallic portions inserted into said holes or sockets, and a
locking device or key to firmly secure the said non metallic portion in its socket,
substantially as described.
2. A composite brake-shoe, consisting of a metallic portion having one or more
sockets or holes, non metallic portions inserted into said holes or sockets, and a
locking device or key embedded in the said non-metallic portion to firmly secure
the same to the metallic portion, substantially as described.
3. The herein before described composite brake-shoe, consisting of a metallic
portion having a solid rear portion and provided with one or more sockets or holes
extended from the front face of the shoe toward the solid rear portion, non metallic
plugs inserted into said holes or sockets, and a key or device to lock the said plug
in its socket, substantially as described.
4. The herein described composite brake-shoe, consisting of a metallic portion
having one or more sockets enlarged at their rear ends, non-metallic plugs inserted
therein and a key or locking device to distend the rear end of the non-metallic
plug into the enlargement of the socket or hole, substantially as described.
5. A composite brake-shoe consisting of a metallic portion having one or more
holes or sockets, one or more plugs of a softer material inserted into said sockets,
and a locking device or key to firmly secure the plug in its socket, substantially as
.described.