Improvements in the Construction of Bearings for Revolving Tables: and similar Apparatus.
Year: 1895

page_text: Date of Application, 16th Aug., 1895
Complete Specification Left, 10th Apr., 1896-Accepted, 16th May, 1896
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Bearings for Revolving Tables:
and similar Apparatus.
I, JAMES MILNE Milton House Works Edinburgh, Engineer do hereby declare the-
nature of this invention to be as follows:-
"
In the employment of roller bearings under revolving tables which may require to-
carry heavy weights for the minimising of friction, the rollers are frequently made
with conical bearing surfaces, tapering inwards. It is found, however, that owing to
the taper of the rollers and also of the pathways, the outward thrust upon these
rollers is considerable, and the friction on the nut or washers or other appliances
which keep them in position on their spindles or on the " centre sometimes
employed is consequently very great. The present invention seeks to obviate this
difficulty by the application of ball bearings at the outer end of the rollers where the
thrust comes into play. The construction may be as follows:-Any suitable size andi
number of balls are enclosed in a channel or pathway sunk in the end of the roller,...
and are held in position by one or more washers which are carried by the projecting
spindle of the roller, and made fast by a nut screwed on to the spindle or by any
other suitable device, or the balls may be placed in a similar channel or pathway cut
in the inner side of the washer next to the roller, or partly in a channel in the end of
the roller or in the outer side of one washer, and partly in a similar channel in the
inside of the inner or outer washer, as the case may be, or in any similar suitable way.
This invention can be applied to many kinds of machinery where roller bearings are
employed.
Dated this Fifteenth day of August 1895
Improvements in the Construction of Bearings for Revolving Tables.
and similar Apparatus.
I, JAMES MILNE, Milton House Works, Abbeyhill, Edinburgh, Engineer, do
hereby declare the nature of this invention and in what manner the same is to
be perforined, to be particularly described and ascertained in and by the following
statement:-
This invention relates to improvements in roller bearings under revolving tables.
which may require to carry heavy weights and is specially applicable to the revolving
apparatus employed in lighthouses.
For the minimising of friction the rollers are frequently made with conical bearing
surfaces rolling on conical pathways, the centre of the conical planes being the centre.
of the revolving axis.
Owing to the taper on the rollers and pathways there is a strong outward thrust
upon the rollers causing great friction upon the nut, washers or centres or other
fixings employed to hold the rollers in position.
The present invention consists in the application of a circle or circles of halls.
Price 81

page_text: running in suitable channels which revolve with the rollers and reduce friction to a
minimum. As examples of various ways in which my invention may be applied
I refer to the accompanying drawings.
Figure 1 is a sectional elevation shewing on large scale rather more than half of a
revolving table with its revolving carriage and base.
A is the supporting base with a turned conical pathway B finished to a cone
radiating from the centre C and with a guide pillar D upon which the guide rollers E
of the revolving carriage and the guide rollers F of the revolving tables bear if
necessary.
L is the revolving table or similar apparatus with a turned conical pathway M on
its under surface.
GG is the revolving carriage upon which are fitted the guide rollers E and the
bearing rollers HH which are turned to a cone radiating from the centre C and are
carried upon spindles N fitted to the carriage G.
These spindles are fitted on outward end with a nut and washers K K or with
centres or other suitable fixings to prevent the roller H being thrust outwards and it
is in the application of ball bearings in the construction of these nuts, washers or
other fixings that the subject of this invention lios.
The application of these ball bearings in the construction of revolving carriages to
carry the bearing rollers can be carried out as shewn in Figure 1 which has loose
washers with balls inside a groove and can be slipped on the spindle outside the
roller and held in position by a double nut. It may also be carried out as shewn in
Figure 2, where one part of the groove forms part of the roller, or as in Figure 3
where 2 grooves are employed, or as in Figure 4 where the spindle can be applied
from the outside of the roller and is held in position by an outer ring, a bow or hoop,
or in any other similar suitable manner.
Figure 5 shews in plan on a smaller scale the revolving carriage and base as in
Figure 1.
Having now particularly ascertained and described the nature of my said inven-
tion, and in what manner it is performed I declare that what I claim is :-
The application of ball bearings to conical rollers supporting revolving tables and
similar apparatus, substantially as and for the purposes hereinbefore described.
Dated this Ninth day of April 1896.
JAMES MILNE.