Improvements in Expanding Pulleys.
Year: 1896

page_text: Date of Application, 9th July, 1896-Accepted, 29th Aug., 1896
COMPLETE SPECIFICATION.
Improvements in Expanding Pulleys.
I, MARK MUSGREAVE, of No. 3230, North Fifth Street, City and County of
Philadelphia, and State of Pennsylvania, United States of North America,
Mechanical 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 staternent :-
This invention relates to expanding pulleys for driving a class of machinery
requiring variable speeds. I attain these objects by the mechanism illustrated in
the accompanying drawings, making a part of this specification in which:
Fig. 1 is a front view of my invention; the lower shaft and all on it is shown in
section.
Fig. 2 is a face view of the cone.
Fig. 3 is a side view of the cone.
Fig. 4 is a face view of the spider.
Fig. 5 is a side view of the spider.
Fig. 6 is a face view of one section of the expanding pulley.
Fig. 7 is an edge view of one of the pulley sections showing the foot
Figs. 8 and 9 are views of the adjusting collar.
Figs. 10 and 13 are views of the shifting fork.
Figs. 11, 12 and 14 are views of the split collar.
Figs. 15 and 16 are views of the square tube.
Figs. 17 and 18 are views of the screw thread shafts.
Fig. 19 is a vertical section, taken on a vertical line inside of one of the
hangers.
Similar numbers of reference refer to same parts in the several views.
1 represents the expanding pulley, 2 the cone, 3 the spider, 4 the guide rods,
5 the shifting forks, 6 the split collar, 8 the supporting shaft for the square tube,
7 and 9 the right and left hand screw threaded shaft, 10 the regulating collar or
disk, 12 the regulating bolt, 13 the inclined foot.
These parts are all made of metal.
The expanding pulley I make in six sections, each section is constructed as
shown in Figures 6 and 7. The arm of each section has a slot 142, see Fig. 6, and
a rib 15, see Fig. 7. This rib is fitted to slide in between the ribs 16, on the face
of the cone 2, see Fig. 2. Each section of the pulley is fixed so as to slide in the
ribs 16, by a bolt, to the cone 2..
The spider 3 is formed. with six arms 17, to these arms are fixed guide rods. 4.
The central lower ends of the rods are inserted in the pockets 18, see collar 10,
Figs. 8 and 9. The rods 4, and ribs 19 of the spider 3 form slots 20, see Fig. 1..
In this slut 20 is fitted the foot 13 of the pulley arms. The cones 2, are fastened
to the shafts 14, by set screws, and the spiders 3, are mounted loose on the
shafts 14.
On the right hand end of shaft 8, is a sprocket wheel, and a chain belt 21,
and on the left hand end of the shaft 9, is also a sprocket wheel, and a chain
belt 22.
The shafts 14 and 14' carrying the expansion pulleys are mounted in hangers 23,
see Fig. 1. These two shafts are placed nearly one under the other as shown in
Fig. 19. The lower shaft. 14', being the driver, the top shaft the driven.
The drawings Fig. 1 shows the lower pulley contracted, the upper pulley
expanded to its full extent.

page_text: By pulling the chain belt 21, the screw thread on the shaft 8 working in the
tube 7, will shift the square tube 7 carrying the shifting forks 5, to the left hand,
this will expand the lower pulley and contract the upper pulley, and the speed of
the shaft 14, will be increased.
Shall it be desired to use the device to stop the top driven shaft, the chain
belt 22, is pulled, which turns the shaft 9, the left hand screw in the lug 24, will
move the shifting fork 5. on the left hand of the square tube 7. this will contract
the top pulley, (the bottom pulley being contracted as far as it can be) the belt will
be slackened, and stop the top driven shaft 14.
When the two pulleys are both expanded, the shaft 9 will operate both forks 5,
and they will be moved on the tube 7, from the collars 25, the right and left hand
screws acting on both lugs 24 and 24'.
When starting the pulleys by the shaft 9, the right and left hand screw threads
shift the forks 5. hard up against the collars 25. which are fastened on the tube 7.
by set screws.
To adjust the slots 20, under the guide bars 4, so that the slots will properly fit
the foot 13, the collar 10, is moved by the regulating bolts 12, shown in Figs. 4
and 5.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that
what I claim is :-
1. In a mechanism for changing speeds; stopping and starting machinery by a
driven belt. The combination of the following elements: Two expanding pulleys,
each pulley being constructed of a series of sections, two fixed cones, 2. said cones
being provided with a series of ribbed guides, 16. between which guides the arms of
the sectional parts of the pulley slide when expanding or contracting. Two sliding
spiders 3, said spiders having each provided with a series of square guide bars 4,
said guide bars and ribs 19, form slots 20, in which slots slide the foot 13, on the
central part of each pulley section. The two spiders being operated simultaneously,
expanding one and contracting the other; changing the speed, stopping or starting,
as shown and described. $
2. An expansible pulley mechanism comprising two shifting forks, a square tube,
a supporting shaft, upon which shaft is cut a screw thread, by which screw
the two forks are moved at one and the same time, to the right or left hand,
one fork expanding, and one fork contracting a pulley, substantially as shown and
described.
3. An expansible pulley mechanism, comprising two shifting forks, a square tube,
a supporting shaft, and a supplementary shaft. 9, upon which shaft is cut a right
and a left-hand screw-thread, all substantially as shown, described, and for the
purpose specified.
4. An expansible pulley mechanism comprising the combination of a sliding
collar, or disk, having a series of inclined pockets, a series of guide bars, regulating
bolts, for regulating and adjusting the guide bars, and slots for the feet 13. on the
end of each arm of the expanding pulley section, all substantially as shown and
described.
Dated this 9th day of July 1896
S. S. BROMHEAD,
97, Newgate Street, E.C., Agent for Applicant.