Improvements in Jointing-plates for the Rims of Split Pulleys.
Year: 1890

page_text: Date of Application, 28th June, 1890-Accepted, 9th Aug., 1890
COMPLETE SPECIFICATION.
Improvements in Jointing-plates for the Rims of Split Pulleys.
I, WILLIAM THOMLINSON-WALKER, of Victoria Iron Works, Walmgate, York,
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 statement :-
In the Specification of my invention number 9437 dated 7 June 1889 I have
described a jointing-plate for connecting the two halves of a split pulley, the jointing
plates being so constructed that when the two halves of the pulley are bolted together
at the hub or boss, they dovetail into each other, thus taking up the side strain at the
rim joints and greatly relieving the pulling strain; the two jointing plates being
secured together by a taper holt employed to expand a split portion of the joint when
the jointing plates are fitted together.
My present Invention, which has for its object to simplify the construction of the
jointing plates above referred to, to strengthen the joints, and to facilitate the fitting
of the several parts together, is shown in the accompanying drawing adapted to a split
pulley at Figure 1; Figure 2 is a side elevation and Figure 3 an end elevation of the
joint and a portion of the rim shown to enlarged scale. Figures 4 and 5 are elevational
views, and Figures 6 and 7 inverted plan views of the two portions of the joint, shown
detached.
9
In accordance with my present Invention a, b, are the jointing-plates or strips
secured by rivets c to the ends D, D, of the two halves of pulley to be joined. A is
projecting lug standing out at right angles to the plate a the sides being flattened
so as to be received within the jaws of the socket or recessed lug B formed with the
plate or strip b. The two parts A, B, which have a central aperture as shown, may
be drawn together by an ordinary stud C and nuts; by the taper bolt arrangement
described in my former specification above identified; or, by other suitable means.
An important feature, distinctive of my present Invention, consists in attaching the
joint to, or forming in combination with, a spoke or arm of the pulley instead of
making it separate, as occurs for instance, in the arrangement described in my former
specification. In the present case the spoke E is formed, at its outer end, in com-
bination with a thickened portion A constituting the lug of the attachment plate or
strip a; the spoke E, thickened portion A and plate or strip a may thus be in one
piece with the resultant advantage that in addition to strengthening the pulley at the
joint by arranging the split portion directly over the spoke this arrangement will
allow of the joint, together with the ends of the spokes or arms, being machined or
ground to the internal radius of the pulley rim at one, and the same operation, instead
of separately as applies in the case of the jointing plates described in the specification
of my former Patent hereinbefore referred to.
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
First-In split pulleys a combined joint and spoke or arm comprising a recessed
or socketted lug B within which the projecting or thickened end A of the spoke E
is drawn by a stud and nuts, taper bolt, or equivalent means substantially as herein
set forth and shown and for the

page_text: Second-The improvements in jointing-plates for the rims of split pulleys substan-
tially as set forth and shown.
Dated this 12th day of June 1890.
JAMES STEVENSON,
Gray's Inn Chambers, 20, High Holborn, London, W.C., Agent for Applicant.