An Improved Tool for Drawing Cranks, Chain Wheels, and the like off Axles.
Year: 1892

page_text: Date of Application, 22nd June, 1892
Complete Specification Left, 8th Feb., 1893-Accepted, 1st Apr., 1893
PROVISIONAL SPECIFICATION.
An Improved Tool for Drawing Cranks, Chain Wheels, and the like
off Axles.
I GEORGE THOMAS FERRELL, of 33, Cock Lane, Snow Hill, in the City and
County of London, Engineer, do hereby declare the nature of this invention to be
as follows:-
My invention relates to a tool for drawing cranks, chain wheels, and the like,
off axles and it is specially adapted for drawing the chain wheels off the pedal-
crank axles of velocipedes.
My improved tool consists essentially of a block having a central hole threaded
internally to receive a screw bolt, one end of the said hole being enlarged to adapt
the block to be fitted over the end of the axle and over the boss of the chain
wheel; and of a plate formed in two halves adapted to be placed against the
back side of the chain wheel to be drawn. Three or more screw bolts passing
through the block are adapted to screw into the two parts of this plate to clamp
the chain wheel between the said block and plate. By screwing up the central
screw bolt it impinges on the end of the axle and so draws the wheel therefrom.
Grooves or slots may be made in the faces of the block and of the divided plate
adapted to fit against the wheel, to receive the spokes thereof.
By varying the shape of the divided plate and the engaging face of the block,
this tool may be used for drawing cranks and the like.
T1000
ROBT. ED. PHILLIPS, M.I.M.E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicant.
An Improved Tool for Drawing Cranks, Chain Wheels, and the like
off Axles.
I, GEORGE THOMAS FERRELL, of 33, Cock Lane, Snow Hill, in the City and
County of London, Engineer, do hereby declare the nature of this invention and
in what manner the same to be performed, to be particularly described and
ascertained in and by the following statement:-
My invention relates to a tool for drawing cranks, chain wheels, and the like off
axles, and it is specially adapted for drawing the chain wheels and cranks from the
pedal-crank axles of velocipedes.
My improved tool consists essentially of a block having a central hole threaded
internally to receive a screw bolt, one end of the said hole being enlarged to adapt
the block to be fitted over the end of the axle and over the boss of the chain
wheel, and of a plate formed in two halves adapted to be placed against the back
side of the chain wheel or crank to be drawn. Three or more screw bolts passing
through the block are adapted to screw into the two parts of this plate to clamp
the chain wheel between the said block and plate. By screwing up the central
screw bolt it impinges on the end of the axle and so draws the crank or chain
wheel therefrom. Grooves or slots may be made in the faces of the block and
Priss d

page_text: of the divided plate adapted to fit against the wheel to receive the spokes
thereof.
In order that my invention may be fully understood I will more particularly
describe it making reference to the accompanying drawing, in which
Figure 1 is a view in sectional elevation of the block, and Figures 2 and 3 are
views in plan of the top and bottom thereof.
Figure 4 is a view in sectional elevation of the divided plate for drawing chain
wheels, and Figures 5 and 6 are views in plan of the top and bottom thereof.
Figure 7 is a view in plan of the divided plate shaped for drawing cranks, and
Figure 8 is a view in elevation of one half of the said plate.
Figure 9 is a view in sectional elevation showing the application of the improved
tool.
Throughout the several views similar parts are marked with like letters of
reference.
Referring to the drawing, A designates the block having a central threaded hole a
enlarged at one end to form a recess a¹. B designates the operating screw bolt
threaded into the hole a in the block A and preferably having a ball or sphere b
loosely mounted in its operating end. C, C, designate the two halves of the divided
plate. On one side of this divided plate is formed a lip c adapted to engage with
the bottom edge of the block A, and having in it a series of slots c¹, c¹, for the
spokes of the chain wheel to fit in. Through the divided plate is formed a central
hole c² which is enlarged to form a recess c³ in the side of the plate opposite to
that having the lip c, the object being to reduce the thickness of the divided plate
round its central hole to enable it to be placed between the chain wheel X and
bearing case Y of the cycle, between which there is usually very little space.
D, D, etc. designate the screw bolts passing loosely through holes a², a², etc. in the
block A, and adapted to screw into threaded holes c, c, etc. in the divided
plate C.
When the divided plate is for use in drawing cranks it is made of the shape
shown by Figures 7 and 8, the central hole c² being shaped and slotted to adapt it
to fit over the crank, and in this case the two parts of the plate are preferably
held together by transverse taper pins C, C, passing through holes in ears c³, c³,
formed on the two halves of the plate.
The plate C, is made in two parts to enable it to be placed behind the chain
wheel X, or crank, it is intended to draw, and the holes a², a², etc. in the block A
and the holes, c, etc. in the divided plate are preferably placed as shown to
enable them to clear the spokes of the chain wheels.
It will be seen that when the block A and the divided plate are clamped to the
crank or chain wheel and the bolt B screwed down into the block, the said bolt
impinges on the end of the axle Z and so draws the crank or chain wheel from
the axle.
I wish it to be particularly understood that I do not limit myself to the precise
details of construction hereinbefore set forth and illustrated by the accompanying
drawing, but that I hold myself at liberty to make such changes and alterations as
fairly fall within the spirit and scope of my invention.
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. The improved tool for drawing cranks, chain wheels, and the like off axles, as
hereinbefore described and illustrated by the accompanying drawing.
2. An improved tool for drawing cranks, chain wheels, and the like, consisting
essentially of the block A having a central threaded hole a; of the divided plate C,
adapted to be placed behind the crank or chain wheel; of the screw bolts D, D, etc.
adapted to clamp the block A and the divided plate C, to the crank or chain wheel
one on each side thereof; and of the screw bolt B threaded into the hole a in the

page_text: block A and adapted to impinge on the axle carrying the crank or chain wheel
and on being screwed further into the said block to draw the crank or chain wheel
from the axle, as set forth.
D
1902
ROBT. ED. PHILLIPS, M.I.M.E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicant.