Improvements in Shields or Dust Excluders for Axle Boxes.
Year: 1895

page_text: Improvements in Shields or Dust Excluders for Axle Boxes.
We, GEORGE WILSON of 13 Victoria Street in the City of Westminster, Civil
Engineer, and JAMES CHARLES MARGETSON of Melksham in the County of
Wilts, India Rubber Manufacturer, do hereby declare the nature of this invention
to be as follows:-
This invention bas reference to shields or dust excluders for axle boxes, and its
object is to provide a perfectly dust-tight joint in the grooves at the back of the
axle box and around the axle.
According to our invention we form the shield or dust excluder with an enclosed
air space or pneumatio lube around the central aperture which fits around the axle ; :
this air space or pneumatic tube serves as a cushion and gives elasticity, or
compressibility to the shield at that part, and ensures its fitting tightly around the:
axle, whether the body of the shield be made of wood or rigid material as has
hitherto been usual, or whether the body be made flexible and compressible as
hereinafter described.
-
"
We also according to our invention make the shield flexible and compressible
so that it will fit tightly in the axle box grooves and make a dust-tight joint at:
that part. With this object we preferably make the body of the shield of porous.
india rubber of the kind known as sponge rubber, which gives flexibility to the
shield and allows it to be easily compressed for fixing into the axle box grooves.
We protect the faces of the rubber by sheets of zinc, tin or other suitable.
material, which not only prevent the oil in the axle box from coming in contact
with the rubber, but also provide the shield with a durable and even surface. We
protect the outer and inner edges of the rubber by asbestos sheeting to keep them
from contact with the oil, and we prefer that the asbestos sbeeting at the inner
edge, that is to say around the central aperture which fits around the axle should.
have lead or other soft metal wire woven in it, so that it may be well able to
withstand the friction of the revolving axle. In order, with this construction of
the body of the shield, to provide the enclosed air space herein before described,
we preferably form a groove around the inner periphery of the sponge rubber, and.
we stretch the asbestos sheeting over the edges of this periphery and cement it to
the sides, so that an annular space is left between the sponge rubber and the.
asbestos sheeting. We then vulcanize the whole.
T
J. C. MEWBURN & ELLIS,
55 and 56 Chancery Lane, London, Chartered Patent Agents.

page_text: Improvements in Shields or Dust Excluders for Axle Boxes.
We, GEORGE WILSON.of 13 Victoria Street in the City of Westminster, Civil
Engineer and JAMES CHARLES MARGETSON of Melksham in the County of
Wilts, India Rubber Manufacturer, 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 bas reference to shields or dust excluders for axle boxes and its
object is to provide a perfectly dust-tight joint in-the grooves at the back of the
axle box and around the axle.
According to our invention we form the shield or dust excluder with an enclosed
air space or air tube around the central aperture which fits around the axle; this
air space or tube serves as a cushion and gives elasticity or compressibility to the
shield at that part and ensures its fitting tightly around the axle, whether the
body of the shield be made of wood or rigid material as has hitherto been usual or
whether the body be made flexible and compressible as hereinafter described.
We also according to our invention make the shield flexible and compressible
so that it will fit tightly in the axle box groove and make a dust tight joint at that
part. With this object we preferably make the body of the shield of porous india
rubber of the kind known as sponge rubber which gives, flexibility to the shield
and allows it to be easily compressed for fixing into the axle box grooves. We
protect the faces of the rubber by sheets of zino, tin or other suitable material
which not only prevent the oil in the axle box from coming in contact with the.
rubber but also provide the shield with a durable and even surface. We protect
the outer and inuer edges of tho rubber by asbestos sheeting to keep them from.
contact with the oil and we prefer that the asbestos sheeting at the inner edge that.
is to say around the central aperture which fits around the axle should have lead.
or other soft wire woven in it so that it may be well able to withstand the friction.
of the revolving axle.
The accompanying drawings will serve to illustrate our invention :-
Figuro 1 is a part longitudinal section of an axle box fitted with a shield or dust
excluder of wood or rigid material having an enclosed air space or air tube around
the central aperture in accordance with the first part of our invention. a is the.
axle, the axle box, o the groove for the shield and d the shield. The inner.
periphery of the shield is grooved and in this groove is fitted an india rubber tube e
which should be covered with asbestos sheeting to keep it from contact with the
oil. It is preferred to introduce the shield into its place from the bottom of the
box at finstead of from the top as has been usual.
Figure 2 is a face view and Figure 3 an edge view of a shield or dust excluder
made in accordance with the second part of our invention: Figuros 4 to 7 illustrate:
how this shield is manufactured. Figures 4 and 5 showing the shield before the.
protecting sheets are applied and Figures 6 and 7 showing one of these sheets.
We take a flat rectangular piece of sponge rubber g having a circular aperture
of approximately the diameter of the axle to which it is to be applied. We
protect the outer edge of the rubber y by asbestos sheeting and the inner edge
also by asbestos sheeting j (see Figures 4 and 5) the asbestos being first coated with
rubber and then rolled or pressed on to the sponge rubber g and the whole being then 4
vulcanized. As has already been stated we prefer that the sheeting; should have
lead or other soft wire woven in it. We next apply to the faces of the rubber g
protecting sheets kk of zinc, tin or other suitable material for the purposes already
explained. These sheets kk have a flange at each of the four edges and these
flanges are pressed or hammered down upon the outer edge of the rubber
over 5

page_text: the asbestos sheeting as seen in Figure 3. Figure 6 shows in face view and
Figure 7 in edge view one of the protecting sheets kk; the dotted lines indicate
the flanges before being pressed or hammered down upon the rubber g.
If with this construction of the body of the shield it is desired. to provide an
enclosed air space as hereinbefore described we preferably form a groove around
the inner periphery of the sponge rubber g and we stretch the asbestos sheeting j
over the edges of this periphery and secure it to the sides so that an annular space
is left between the sponge rubber and the asbestos sheeting. We then vulcanize
the whole.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim in respect of shields or dust excluders for axle boxes is :-
1. The construction of such shields or excluders with an enclosed air space or
air tube around the central aperture which fits around the axle, substantially as
and for the purpose hereinbefore described.
2. A shield or dust excluder made flexible and compressible so as to fit tightly
in the axle box groove and around the axle, substantially as hereinbefore
described.
3. A shield or dust excluder made of sponge rubber protected at the inner and
outer edges by asbestos sheeting and on the faces by sheets of zinc, or other
suitable material substantially as bereiubefore described.
Dated this 7th day of August 1896.
J. C. MEWBURN & ELLIS,
55 and 56 Chancery Lane, London, Chartered Patent Agents.