An Improved Bush for Shafting or Spindles.
Year: 1889

page_text: Date of Application, 18th Apr., 1889
Complete Specification Left, 17th Jan., 1890-Accepted, 22nd Feb., 1890
PROVISIONAL SPECIFICATION.
An Improved Bush for Shafting or Spindles.
I, LEWIS WILLIAM THOMAS, of the Dour Iron Foundry and Engineering Works,
Dover, in the County of Kent, Engineer, do hereby declare the nature of this inven-
tion to be as follows:
My invention relates to an improved bush or bearing, preferably of metal, whereby
a pulley having a hole of any certain size in its boss may be securely fixed to a shaft
of less diameter; it consists of two eccentric wedge bushes each made in halves, a
grip being secured on the inside of the inner half bushes and on the outside of the
outer half hushes by the insertion of emery cloth, paper, or any other substance or by
any means which will fulfil the purpose of gripping, whereas the surface between the
two half bosses should be slightly lubricated.
The two pairs of eccentric wedge half bushes being placed in the annular space
between the larger hole and the smaller shaft, the thinner end of each wedge shaped
half being against the thick end of the other half; on the pulley, wheel, coupling, or
bearing, being made to revolve it will cause the outer pair of half bushes to turn upon
the inner pair, whereby their eccentricity or circular wedges will expand or increase
in diameter until the gripping power is equal to the driving power of the shaft.
Dated this Eighteenth day of April 1889.
For the Applicant,
W. E. GEDGE,
Agent.
COMPLETE SPECIFICATION.
An Improved Bush for Shafting or Spindles.
I LEWIS WILLIAM THOMAS, of the Dour Iron Foundry and Engineering Works,
Dover, in the County of Kent, Engineer, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :-
My Invention relates to an improved bush whereby a pulley or other article having
a hole of any certain size or shape may be securely fixed to a shaft or spindle of less
size; it consists of two concentric or eccentric wedge bushes each made in halves, a
grip being secured on the inside of the inner half bushes and on the outside of the
outer half bushes by the insertion of emery cloth, paper, or any other substance, or
by any means which will fulfil the purpose of gripping, whereas the surface between
the inner and outer half bushes should be slightly lubricated.
On the accompanying Sheet of Drawing:
Figure 1 is a transverse section of a bush of my Invention before the tightening
up of the outer half bushes;
Figure 2 being a similar section of the same the outer half bushes having travelled
over the inner half bushes so that the bush is tightened up in the hole of the pulley or
other article and on the shaft or spindle ;
Figure 3 shows the several parts of my bush apart ready for application;
Figure 4 represents a perspective view of a pulley on shaft arranged to receive my
improved bush;
Figure 5 is a transverse section through a bush of my Invention the outer half
bushes being of hexagonal shape;
Figure 6 is a transverse section showing a bush of my Invention upon a square
shaft or spindle the inner half bushes being correspondingly shaped;

page_text: Figure 7 is a transverse section showing a bush of my Invention having longi-
tudinal grooves on outer half bushes, with the object of reducing the weight and
Figures 8 and 9 are longitudinal sections through bushes of my Invention having
spiral or circumferential grooves for reducing the weight; similar letters of reference
indicating similar parts in each of the figures respectively.
The two pairs A A, B B, of concentric, eccentric wedge half bushes being placed
in the annular space between the larger hole and the smaller shaft or spindle C, the
thinner end a, a, b, b' of each wedge shaped half being against the thick end of the
other half as shown at Fig. 1; on the pulley, wheel, coupling, or other article being
made to revolve by hand or otherwise, the outer pair of half bushes A A will turn
upon the inner pair B B, whereby their eccentricity or circular wedges will expand
or increase in diameter until the gripping power is equal to the driving power of
the shaft (as represented at Fig. 2-D indicating the extent of .vel of the half
bushes).
I may make the outer surfaces of the outer half bushes either cylindrical, as at
Figures 1, 2 and 5, or square, or hexagonal, as at Figure 4, or in any other shape to
suit holes of corresponding shapes, and with a groove or grooves E, either longi-
tudinally as at Figure 6, spirally as at Figure 7, or circumferentially as at Figure 8.
I prefer that the inner half bushes B B be cylindrical on the inside but they may
be square or of any regular shape to suit the shafting.
My improved bush may be made of metal or any suitable material and is applicable
for shafting or spindles generally.
By using this bush, pulleys can be fixed on shafting or spindl in considerably
less time than in the ordinary way. The well known difficulties and expense of fixing
ordinary pulleys on shafting, which is often of full diameter in places and has to be
reduced by filing or turning is now overcome. This bush can be used equally as well
on rolled shafting as on turned. The fact that rolled shafting is seldom perfectly
cylindrical makes no difference in the action of the bush. As the power applied when
running increases the grip directly upon the shaft, it is apparent that the bush must
be fixed for right or left hand running accordingly, but it is only necessary to reverse
the bush (which is in halves) for opposite driving. The pulley does not require to
be taken off the shaft. The taper of the concentric wedges is such that after the
maximum driving strain has been applied, there is no fear of their loosening through
pulleys over running.
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. An improved bush for shafting or spindles consisting of an inner and an outer
eccentric wedge bush each made in halves and which are so combined concentrically
when applied to a hole in a pulley, wheel, coupling or other article that the revolution
of the pulley, wheel, coupling or other article, causes the outer pair of half bushes
to turn upon the inner pair thereby tightening up the bush upon the shaft or spindle
substantially as described and for the purpose specified.
2. In a bush for shafting or spindles, the outer half bushes A A, in combination
with the inner half bushes B B, constructed, combined, and arranged to operate
substantially as described with reference to the accompanying Drawing.
Dated this Seventeenth day of January 1890.