Improved Safety Appliance for Shafts and Pulleys.
Year: 1894

page_text: Date of Application, 7th June, 1894
Complete Specification Left, 7th Mar., 1895-Accepted, 13th Apr., 1895
Improved Safety Appliance for Shafts and Pulleys.
I, CHARLES HELLIWELL of Church Lane, Hackenthorpe, in the County of
Derby, Machinist, do hereby declare the nature of my invention to be as,
follows:-
My invention relates to the construction of safety appliances for the protection
of persons who have to attend to machinery, shafting, placing belts upon pulleys
and duties of a similar nature, and who thereby run great risk from being
accidentally caught by such revolving shafts and pulleys.
In carrying out my invention in the protection of a pulley and adjacent part of
the driving shaft upon which the pulley or drum is fixed, 1 propose to enclose that
part of the shaft in a metallic sleeve of larger diameter, thus for example suppose
the pulley to be twenty inches diameter and the shaft to be two inches diameter,
I would make the sleeve four inches diameter and three or four feet long if there
was room for it. I prefer to make it in two parts the division being longitudinal
and on one side of each part I form a flange running the whole length or there-
abouts or shorter lugs, provided with bolt holes.
The two parts of the sleeve are held together by bolts passed through the said
bolt holes and are also secured by them to brackets, hangers, or other like supports
by which the sleeve is securely and rigidly held in position around and clear from
the shaft.
At the end of each semi-tubular part of the sleeve I fix a half collar or flange,
and upon these half collars I bolt or otherwise secure a half disc of sheet iron, cast-
iron, wood, or other suitable material; which when in position will form a disc of
eighteen inches diameter or thereabouts so as to fit into the end of the pulley and
leave a little free space for any inequalities in the rim of the pulley.
One or more studs, collars or the like may be secured upon the outside of the
sleeve to prevent a ladder slipping sideways when reared against it.
Half discs of various diameters may be fitted upon the same pair of collars, to
suit pulleys of different sizes.
Dated the 5th day of May 1894
!
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.
COMPLETE SPECIFICATION.
Improved Safety Appliance for Shafts and Pulleys.
1, CHARLES HELLIWELL, of Church Lane, Hackenthorpe in the County of
5 Derby, Machinist, do hereby declare the nature of this invention and in what
manner the same has to be performed, to be particularly described and ascertained
in and by the following statement :-
My invention relates to the construction of safety appliances for the protection
of persons who attend to the numerous requirements of machinery shafting such as
0 oiling bearings, putting belts upon pulleys and drums, and other duties of a similar

page_text: Fig. 1, is an elevation of the appliance as fixed to protect a pulley and shaft,
shown partly in section..
Fig. 2, end view of same.
Fig: 3, one of the half discs.
Fig. 4, plan of the top half of sleeve.
Similar letters indicate similar parts in any of the figures.
In carrying out my invention to protect a pulley A, and the adjacent part of the
driving shafting B, upon which the pulley is fixed, as illustrated in the annexed
sheet of drawings, I prepare a tubular sleeve C, preferably of metal either cast to
shape or made from sheet material, and made preferably in two parts C, and C³,
divided longitudinally to enable it to be readily placed over the shaft. It is made of
larger diameter than the shaft say for example four inches diameter for a two-inch
shaft, but I do not bind myself to any particular size, and it may be of any suitable
length, this depending to some extent upon the position it is to occupy.
prepare each part with a flange D, or equivalent means, by which they may be
adjusted and secured to brackets H, hangers or other supports by which the sleeve
is firmly held in a position concentric with and therefore clear from the shaft which
passes through it.
•
At the pulley end of each part of the sleeve I fix or cast upon it a divided
flange or semi-collar E, and to these half collars I affix preferably by bolts F, a
half disc G, which may be of sheet iron or steel, cast iron, wood, or other suitable
material.
These halves when in position as clearly shown in Fig. 2, form a complete disc,
and are preferably of a diameter that will fit within the periphery of the pulley
leaving a sufficient annular space for any inequalities on the inside of the rim.
One or more studs or projections may be made secured or cast upon the sleeve as
a protection for example to prevent a ladder slipping sideways when reared against
it for use, and indicated by dotted lines Fig. 1.
This appliance may be used upon either one or both sides of a pulley, and may
be supported from a wall W, roof, or other position.
In some cases the lower half of both the sleeve and the disc may be
dispensed with.
Half discs of any diameter may be affixed to the sleeve, to suit pulleys of
different sizes.
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 safety appliance as hereinbefore described and shown.
2. As a safety appliance applicable to pulleys and adjacent shafting, a divided
sleeve held concentrically or thereabouts with and so as to enclose a portion of the
shaft, and provided with a divided disc to fit against, but not to be in contact with
the side of the pulley, or to fit within the rim thereof for the purpose specified, and
as hereinbefore described with reference to the drawings.
3. As a safety appliance applicable to shafting and pulleys, a single upper-part
sleeve provided with a portion of a disc to.fit-against the side of a pulley substan-
tially as described.
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicaut.