Year: 1886

page_text: Date of Application, 18th June, 1886.
Complete Left, 18th Mar., 1887.
Complete Accepted, 19th Apr., 1887.
I FREDERICK LISTER CROFT of 75 Princeville Street Bradford in the County of
York Book Keeper, do hereby declare the nature of this invention to be as follows :-
My invention relates to that type of Pulleys which are "built up," the rim or face
of the pulley being of a malleable metal; preferably wrought iron or steel; that is to
say, the type of Pulley to which my invention relates is that which is made up of more
than one element the rim or face being a malleable metal and preferably of wrought
iron or steel, in contradistinction to the type of Pulleys which are formed or cast in
one piece, such as ordinary cast iron pulleys.
My invention has for its object to provide a better, more durable and more secure
attachment of the spokes or arms with the rim of the pulleys, of the type above
described. To this end I provide the malleable metal rim with thickened, or an extra
thickness of metal at the portion or portions of it where the connection of the arms or
spokes is made with the rim.
In ordinary wrought iron or steel pulleys of the type herein described the rims are
made of thin wrought iron or steel plates or strips of about of an inch in thickness
and the attachment of the arms with their rim is effected by rivetting. This rivetting
is mostly of the countersunk kind. Hence as will be seen only a very shallow depili
of rivetting can be availed of. It is found in practice this rivetting frequently
becomes defective, in that it becomes loose and so the necessary or desirable rigidity
of the pulley no longer exists.
By my invention, namely by the thickening of the part or parts, as above set forth,
I provide a greater depth of bearing for the rivetting, and thereby a better, more
durable and more secure attachment is effected.
As an example of the application of my invention, I will describe a pulley having
arms formed of rods or bars which are directly rivetted to the rim at their extremities.
In such a case I form the rim of thin wrought metal of say of an inch the portion
or portions of the rim to which the arms are connected being of greater thickness
than that at the edges, for example it may be made of an inch in thickness. At

page_text: this thickened portion 1 form the tapered holes and secure the arms to the rims by
rivetting their ends in such holes in the ordinary way.
Rims of pulleys according to my invention may be made of rolled strips, or plates,
rolled, with thickened portions formed thereon in a continuous row or in multiple
rows according to the size and particular requirements of the application. Or they
may be made of plates or strips having interspaced thickened portions formed thereon.
The bosses of the wheels are preferably made in halves and are connected together
by clips made of dovetail form, the flanges of the bosses being also dovetailed to corre-
spond with the clips. By this means the ordinary bolt and nut method of securing
the halves of the bosses together is dispensed with.
My invention is applicable to many and various kinds of pulleys of the type herein
defined such for example as the split or solid pulley and spring" pulleys now in
common use.
"
By the use of my invention the following advantages amongst other sare obtained:
A firmer and more durable attachment of the arms with the rims; and an extra factor
of strength is given to the rim combined with lightness.
antonih day of Tuno 1886

page_text: FREDERICK LISTER CROFT, of 75 Princeville Street, Bradford in the County of
York, Bookkeeper, 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 :-
::
My Invention relates to that type of pulleys which are built up," the rim, or face
of the pulley being of a malleable metal, preferably wrought iron, or steel, that is to
say, it is made up of more than one element the rim, or face being of a malleable
metal and preferably of wrought iron, or steel in contra distinction to the type of
pulleys which are formed, or cast in one piece, such as ordinary cast iron pulleys.
My Invention has for its object to provide a better, more durable and more secure
attachment of the spokes, or arms with the rim of pulleys of the type above described.
To this end I provide the malleable metal rim internally with an extra thickness of
metal at the portion, or portions of it where the connection of the arms, or spokes is,
or are made with the rim.
In ordinary wrought iron, or steel pulleys of the type herein described the rims are
made of thin wrought iron, or steel plates or strips of about of an inch in thickness
and the attachment of the arms with their rim is effected by rivetting. This rivetting
is mostly of the countersunk kind and has only a shallow depth of rivet head. It is
found in practice this rivetting frequently becomes defective, in that it becomes loose
and so the necessary, or desirable rigidity of the pulley no longer exists.
As an example of the application of my Invention, I will describe a pulley having
arms formed of rods, or bars, which are directly rivetted to the rim at their
extremities. In such a case, I form the rim of thin wrought metal, of say of an
inch the portion, or portions of the rim to which the arms are connected being of
greater thickness than that at the edges, for example it may be made of an inch in
thickness. At this thickened portion I form the tapered holes and secure the arms to
the rim by rivetting their ends to the full depth of the thickened portions in such
holes.
Rims of pulleys according to my Invention may be made of rolled strips, or plates
rolled with the thickened portions formed thereon in a continuous internal circumferen-
tial row, or in multiple rows according to the size and particular requirements of the
application, or they may be made of plates, or strips having interspaced thickened
portions formed thereon.
The bosses of the wheels are preferably made in halves and may be connected
together by clips made of dovetail form or bolts.
My Invention is applicable to many and various kinds of pulleys of the type herein
defined, such for example as the split, or solid pulley and spring pulley now in
common use.
The Drawings hereto annexed illustrate various kinds of flat surfaced rims of
pulleys with their spokes connected according to my Invention.
the
With reference to Figures 1 to 8 of the Drawings a designates the rim and
spokes of pulleys. a' represents the thickened portion, or portions which are formed

page_text: 3
3
in the interior of the rim, the surface, or periphery of the pulleys being flat, or even
in the direction of their width. e are the rivetted heads of the spokes, or other
fastening as the case may be and as will be seen upon reference to the Drawings are
secured to, or rivetted in holes countersunk the full depth of the thickened portion, or
portions through which they pass. The Drawings represent rims of pulleys of say 16
of an inch at their edges and the thickened portion may be of an inch Hence in
this case the holes in the rims, being tapered throughout their full depth would present
a bearing to the heads of the rivets due to the full depth of such thickenhead portion,
or portions.
In Figures 1. 5 and 6 the thickened portions a¹ consist of an internal circumferen-
tial row, or ring, whilst Figures 7 and 8 show respectively duplex and triplex armed,
or spoked pulleys and have a thickened circumferential ring a for each set of spokes,
or arms b.
In Figure 2 the pulley rim a is thin at the edges and gradually increased in thick-
ness towards the portion at which the spokes or arms are attached. In this case as in
Figure 1.the thickened portion a' is circumferential.
In Figures 3 and 4 the rims a of the pulleys are provided with interspaced internal
thickened portions a¹. The construction of pulley rim a as shown in Figure 3
consists of bosses a formed in the interior of the rim in any convenient way and in
Figure 4 the thickened portions a are in the form of strips running from edge to
edge:
The arm & shown in Figure 5 is of cast iron of known form having a flange b'.
This is rivetted to the rim a by rivets and the arms in Figure 6 are of wrought
iron, or steel made of bent bars of triangular form thus:- These are also a known
type. The connection of the arms to the rim is made as in Figure 5 by rivets c. The
spokes, or armis in Figures 1. 2. 3. 4. 7 and 8 are of the ordinary wrought metal rod
"type.
:
In all cases the connection is the same, namely the holes in the rim are tapered and
the rivet heads (see Figures 5 and 6) or rivetted spoke heads e (see Figures 1. 2. 3.
4. 7ind 8) bear in such tapered holes for the full depth of the thickened portions of
the rims; but prefer the construction of rim spoke and the connection of such spoke
to the rim set forth and shown with reference to Figures 1. 2. 7 and 8 of the
'Drawings, as this form is cheaper to make and at the same time is a stronger and
"more rigid form.
:-
a. 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 :-
First. In pulleys of the type herein described rims provided with an extra thickness
of incial at the portions at which the spokes are connected thereto in combination
with the construction of connection of the spokes to such rims herein described,
consisting essentially of holes tapered to the full depth of the metal of the thickened
portion, or portions of the rims into which holes the heads of the spokes, or rivets
connecting such spokes to the rims are pressed, or rivetted.
Second: The various particular constructions of rims in combination with the con-
struction of connections above claimed substantially herein set forth with reference to
Figures 1. 2. 3. 4. 5. 6. 7 and 8 of the Drawings.
Dated this 17th day of March 1987