Improvements in Adjustable Bearings for Rotary Blowers, Fans, Dynamos, and the like.
Year: 1889

page_text: COMPLETE SPECIFICATION.
Improvements in Adjustable Bearings for Rotary Blowers, Fans,
Dynamos, and the like.
1. THOMAS HIRST THWAITES, of the firm of Thwaites Brothers Limited, Vulcan
Iron Works, Bradford in the County of York, Engineer, 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:-
My improvements consist in applying to the shafts of rotary blowers or of other
machinery running at a high speed a sleeve or bush of hard metal which prevents
wear of the shaft itself, and which revolves with the shaft in an adjustable bearing
which can be tightened to compensate for wear, but such adjustment is so constructed
as not to alter the relative positions of the two shafts of blowers to one another, nor
does it alter the position of the centro of other shafts when adjusted.
In order to enable my invention to be fully understood I will proceed to describe the
same with reference to the accompanying drawings in which
'
Figure 1 represents a sectional elevation Figure 2 a transverse section and Figure 3
a side elevation of my improved bearing as applied to one of the shafts of a rotary
blower, Figures 4 and 5 represent a sectional elevation and front elevation partly in
section, respectively, of a modification of the same.
Similar letters refer to similar parts in all the drawings.
A portion of the end plate of a rotary blower is represented at B, where it is
formed into a recessed chamber similar to a stuffing box, to receive the bearing C of
the shaft A.
The bearing C is made in the form of a gland and is bored with a tapering hole
to fit upon the sleeve or bush D which is keyed at E upon the shaft A, and which
sleeve is by preference cast with internal recesses or grooves which reduce the weight
thereof.
The sleeve or bush D which, being keyed to, revolves with the shaft, is by preference
made of phosphor bronze, and when this sleeve, or the bearing C in which it rotates,
becomes worn, the bearing or · gland tightened by means of the nuts F and
subsequently when a channel is worn at the bottom of the bearing it is turned the
reverse side up, either or both of which adjustments compensate for wear without
changing the position of the shaft.
In the modification represented at Figures 4 and 5 the bearing C is adjusted to com-
pensate for wear by means of the nuts GG which engage with a screw thread formed
upon the shaft A and bear against a washer H pressing upon the bearing, the sleeve
or bush D being keyed upon the shaft A as herein before described.
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. Adjustable bearings for the shafts of rotary blowers and other high speed shafts
consisting of a sleeve of hard metal keyed upon the shaft, revolving therewith in a
movable bearing or gland which is actuated by means of screw nuts, substantially in
the manner described and represented in the accompanying drawings.
2. The general arrangement and combination of the various parts forming an
adjustable bearing for revolving shafts substantially as described and as represented in
the accompanying drawings.

page_text: 3. In combination with a rotary or "Roots" blower the adjustable bearings for the
shafts thereof, constructed and operating in the manner described and as represented in
the accompanying drawings.
Dated this Third day of October 1889.
WILLIAM JAMES BAKER,
2, New Street, Huddersfield, Agent for the Applicant.