Improvements in Changeable. Bushes or Linings for Driving Pulleys and Wheels.
Year: 1889

page_text: i
Date of Application, 11th Apr., 1889.
Complete Specification Left 11th Feb. 1890 Accepted. 15th Mar.. 1890
PROVISIONAL SPECIFICATION.
Improvements in Changeable. Bushes or Linings for Driving Pulleys
and Wheels.
I JOHN MACKIE of 165 Kings Road Reading Berks. Engineer do hereby declare
the nature of this invention to be as follows:--
That bushes or linings which are to be inserted into the bore of pulleys or wheels
which are made oval be also made oval and the bore of the bushes or linings made the
same diameter as the different shafts or spindles for which they are intended.
By moving the wheels or pulleys and bushes or linings in opposite directions
causes the bushes.or linings to clasp the shafts or spindles on which they are placed.
The bushes or linings may be made of any metal or wood.
The pulleys or wheels bushes or linings may be made in one or any number of parts
as desirable, for the desired end in view.
COMPLETE SPECIFICATION.
Improvements in Changeable Bushes or Linings for Driving Pulleys
and Wheels.
1 JOHN MACKIE of 165 Kings Road Reading, Berks., Engineer, do hereby
declare the nature of my said invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
The object of my invention is to effect improvements in fitting pulleys, wheels or
riggers, whereby improved facilities are afforded of attaching the same to shafts of
various diameters.
My invention consists in forming split bosses so that, when placed together, the
diameter in one direction is rather smaller than that at right angles thereto. This
is effected by forming the bosses in two segments, and making the sum of the two
versed sines rather less than the original diameter of the bore. This formation may
be applied to either the outside or the inside bore of the split boss, as required, and
also to the boss of the pulley, wheel, or rigger.
By moving the wheels or pulleys and bushes or linings in opposite directions, the
bushes or linings are caused to clasp the shafts or spindles to which they are fitted.
The bushes or linings may be made of metal, wood or other suitable material; and the
pulleys or wheels, bushes or linings may be made in one or any number of parts,
according to the size and other particulars relating to the same.
And in order that my said invention may be particularly described and ascertained
reference is hereby made to the accompanying drawing, illustrating one method of
carrying out my invention, and from which illustration other adaptations will be
readily understood.
In the drawing an ordinary split pulley is shown, of which a a are the two portions
of the boss, united by bolts and nuts. The diameter of the bore is rather less from
1 to 2 than that from 3 to 4. b is a movable collar or bush, the outer diameters of
which from 1 to 2 and from 3 to 4 coincide with the bore of the boss a. The bore of
the bush b is made cylindrical to fit the shaft.
When fitted to the shaft the collar bis turned partially round in the boss a, either
by hand or by the action of the pulley itself when being driven; whereby the collar b
becomes jammed in the boss a, and the collar 6 also jams and is caused to bite the
shaft and remain fast.

page_text: 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. The method of segmentally boring and forming bosses and bushes and the
application and use of the same to pulleys, wheels and riggers, in such a manner that
a partial rotation of the bush causes a jamming action both upon the bush and the
shaft, substantially as herein before described and illustrated by the drawing.
2. The general construction, arrangement and combination of the several and
respective parts, together forming my invention of Improvements in changeable
bushes or linings for driving pulleys and wheels, substantially as hereinbefore.
described and illustrated by the drawing.
Dated 11th February 1890
GEO.
DOWNING,
8, Quality Court, Chancery Lane, London, W.C., Agent for Applicant.