Year: 1888

page_text: Date of Application, 4th June, 1888
Complete Specification Left, 4th Mar, 1889
Complete Specification Accepted, 4th May, 18
I LUCIEN PIERRE BOUGOUIN of 38 rue Di ierot Paris in the Republic of France
Engineer do hereby declare the nature of this invention to be as follows
-
This Invention relates to antifriction or roller bearings for shafts or journals and
consists in the employment of differential rollers or rollers of two or more diameters
so arranged that the large diameter rolls on the box or ring surrounding the rollers
and the smaller diameter rolls on the shaft or Journal or vice versa
In a bearing
constructed according to this invention for a rotating shaft for example I employ
series of rollers the middle part for example of which is of longer diameter thin the
ends and arrange these rollers around the shaft which is provided with a beaning ring
fitted on to the shaft and presenting in innular groove or channel of such a depth
that the ends or smill diameters of the rollers may roll around the ring without the
enlarged middle parts of the rollers touching the bottom of the said groove or
channel I also provide a fixed ring surrounding the rollers this ring being internally
grooved or channelled to such a depth that the enlarged middle part of the rollers can
roll on the bottom of this groove or channel without the ends touching the internal
surface of the ring at the sides of the sud groove or channel The parts of the
bearing in contact with the rollers may be lined or covered with suitable metal and
the ends of the bearing closed in by plates or discs which exclude dust and may also
be arranged to act in combination with shoulders or collars on the shaft to prevent
longitudinal displacement of the latter The rollers may be placed loosely in the
The
bearing or they may be connected together by rings in the usual manner
pro-
portions between the different diameters of the rollers and the diameters of their
respective annular or cylindrical surfaces on which they roll are about the same
that is to say the difference or proportion between the large diameters of the
rollers and the diameter of the outer ring at the bottom of the channel on which
the large diameters of the rollers roll is about the same as the difference or proportion
between the small diameters or ends of the rollers and the diameter of the surfaces of
the inner bearing ring on which the said diameters roll

page_text: 1, LUCIEN PIERRE BOUGOUIN, of 38, Rue Diderot, Paris, in the Republic of France,
Engineer, do herchy 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 and accompanying drawing, (that is to say)
My invention relates to anti-friction or roller bearings, for shafts or axles, and it
consists in the employment of rollers of two or more diameters, so arranged that the
larger diameter rolls upon the box or ring surrounding the rollers, and the smaller
diameter rolls upon the shaft or journil
If for example it is the central part which rolls upon the box, this part does not
touch the shaft, but in such case the two lateral cylinders roll upon the shaft, but do
not touch the box
Moreover the relative diameters of the central cylinder and the lateral cylinders is
the sume as the proportion between the respective paths upon which they roll, so that
no rubbing action takes place between the surfaces
In the accompanying drawing which is in illustration of my invention, Figure 1
shews on the left side in elevation of in axle box the closing or covering plate buing
removed On the right it is shewn in section Figure 2 is a section parallel to the
axis of the shaft and of the rollers
The shaft a is encircled by a steel ring brucessed at its contre so is not to touch
the central part of the roller, which is of larger diameter in the example shewn
The ring supports upon its edges the lateral parts c of the rollers
The central enlarged part d'of the roller rolls, without touching the steel ring,
against another outer steel ring e enclosed in or attached to the cast iron hox or
case which encloses the whole In this way each part of the roller has a rolling
surface only without rubbing
The box fis made in two parts connected together by bolts, as shewn in figure 1
The upper part is provided with a plate g by which it can be fixed under the spring of
a carriage or in any other desired position
The lower part is fixed to the first by the bolts
The ends of the box round the shaft are closed by plates gl screwed to it to prevent
dust from entering, if desired they may be strengthened and supported by rings,
acting in combination with shoulders or collars on the shaft, in cases where lateral
shocks may take place They may also be provided with guides for guard plates
It will of course be understood that the central part of the roller instead of being
of larger diameter than the ends, may be smaller, the ring upon the axle and the box
being suitably shaped The enlarged part of the roller works freely in the annular
recesses, but the sides of the latter serve to prevent the roller from moving out of its
position laterally
It is evident that the box or chamber containing the rollers, as described, may be
used as a bearing or plummer block, the box being turned round into such a position
that the plate g may be. attached to a suitable foundation or other support in any
desired position

page_text: Instead of making the rings separate they may be made in one piece with the box
and the axle respectively
When the weight to be supported renders it necessary to increase the length of the
bearing, or in other words the width of the box, it will be found more convenient,
instead of increasing the length of the rollers, to arrange two or more sets side by
side If the rollers are short there is less hability of their taking an oblique position
which would prevent their working properly, and it is to avoid any displacements of
this kind that I leave the rollers completely free, instead of connecting them together
in any way, in which latter case the slightest displacement would affect the whole set
of rollers and prevent them from working satisfactorily, whilst when the rollers are
independent if any one of them has a tendency to get across, the others it once bring
it back to its proper position This is a great advantage in my improved method of
guiding, which consists in the contact of the side edges of the groove in the bottom of
the box, with the sides of the enlarged part of the rollers, which are left flat and at
right angles to the axis
Where several sets of the rollers are to be employed it is only necessary to arrange
two or more, instead of one, in the width of the box making a corresponding number
of annular recesses in the rings upon which they roll
Each roller may, as already explained, be formed either with its central part of
larger diameter thin its ends, or, on the other hand, with its central part of less
diameter Generally, all the arrangements which I have described for a single set of
ollers will be applicable when several sets are used
The boxes containing several sets of rollers may serve either as axle boxes, or as
bearings for shafts, they are especially applicable for railway carriages or tramcars,
or other cases where they have to carry heavy loads
Hiving now particularly described an 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 In antifriction or roller bearings, the rollers having different diameters at
different parts of their length, and the corresponding paths upon which they roll, the
relation between the diameter of each part of the roller and that of the path on which
it rolls being constant, and so that they only touch each other at a single point,
substantially as described and shewn in the diiwing
2 The use of two or more sets of such rollers arranged substantially as described
when heavy loads have to be carried
Dated the 4th Joh 1000
EDWARDS & Co,
35, Southampton Buildings, London,
Agents for the Patentee