Improvements in Adjustable Pulley Gear.
Year: 1899

page_text: Date of Application, 24th Oct., 1899-Accepted, 6th Jan., 1900
COMPLETE SPECIFICATION.
Improvements in Adjustable Pulley Gear.
We, GEORGE CODE, of 27, School Street, and HANS KNUDSEN, of 186, Devon-
shire Street, both in the City of Boston and State of Massachusetts, United States
of America, Inventors, 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:-
Our invention relates to improvements in adjustable pulley gears, and the
invention consists in the peculiar construction and arrangements of parts, as
hereinafter described and pointed out in the claims.
Referring to the accompanying drawings:
Fig. 1 represents a plan or top view of an apparatus embodying our inven-
tion, showing one of the rigid sliding cones drawn back, and the other rigid
sliding cone pushed in, and the fixed expandable cones in their relative positions.
Fig. 2 is a similar view, showing the rigid sliding cones in a central position,
and the adjustable cones in their relative positions.
Fig. 3 is a section through one of the sliding rigid cones and one of the adjust-
able cones, the sliding cone being drawn out.
Fig. 4 is an outer end view of one of the adjustable cones.
Fig. 5 is an outer end view of one of the rigid sliding cones.
A, represents the supporting frame, upon which are secured bearings B, B,
in which are mounted shafts C. C, on one end of each shaft is secured a disk D,
having a number of ribs, the disk being furcated at the end of each rib, in each
of said forks is fulcrumed an arm or lever E. To the upper end of each of said
arms or levers is attached one end of a spring F, the other end of said spring
being secured to the hub of the disk D, as shown. The outer end of each of
the arms or levers E, is fitted with a pivoted shoe G, to receive the belt H, thus
forming what we term the fixed expandable cone. The shoes G, are each formed
with a rearward extension g, having an opening through which a bar or arm of
the rigid sliding cone passes, as hereinafter described.
Upon each of said shafts C, C, is also mounted, but so as to slide freely, what
we term a rigid sliding cone, consisting of a small inner disk I, and an outer
disk 1', connected together by arms or bars 12. The outer portion of the disks I',
are cach formed with a hub having a recess i, formed therein, in which the
forked ends of a shipper lever J fits; said shipper lever being fulcrumed in its
centre at a, to a cross bar A', in the centre of the frame A. In order to impart
a sliding motion to the hub of the disk I, and to the shipper lever H, for
operating the arms of the expandable cones, we employ a lever K, furcated at
one end, to fit into the groove i, in the hub of the disk I', on the shaft C", the
outer end of said lever being formed with an internal screw thread, that works
upon a screw threaded rod L, mounted in bearings B', attached to the frame A;
the outer end of said rod L, being fitted with a grooved pulley M, operated by a
belt as shown, or other suitable means whereby the lever K is cause to travel

page_text: upon the screw thread rod L, and imparts a travelling motion to the hub of
disk I, and through shipper lever J, a similar motion but in an opposite direc-
tion to the hub of the disk I, so that when one of said disks is forced in, the
other will be forced out, and vice versa.
Each of the arms of the rigid cones pass through one of the slots g, at the
rear of the shoes G, on the ends of the arms of the expandable cones.
Motion is transmitted to the shaft C from any suitable source, and motion
is transmitted from the shaft C¹ by gears or other means to the machine to be
driven.
The operation is as follows:
Motion is first transmitted to the driving shaft C, from any suitable source,
for instance by means of toothed gearing, a band passing over the pivoted
shoes on the fixed expandable cones, imparts motion to the driven shaft C₁, thus,
if the shipper lever is parallel both shafts will be rotated at the same speed;
but if the shipper lever is shifted by means of the lever K, one of the rigid
sliding cones will be drawn out and the other forced in, and thus alter the
diameter of the ends of the expandable cones, so that the speed will be altered
as required.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that
what we claim is:-
1. An adjustable pulley gear comprising two parallel shafts, each having
mounted thereon a fixed expandable cone, and a rigid sliding cone working
within same, a shipper lever for holding the rigid sliding cones in position, and
mechanism for shifting one of the hubs of sliding cones; substantially as set
forth.
2. An adjustable pulley gear having two parallel shafts, a fixed expandable
cone, and a rigid sliding cone on each shaft, a shaft having a worm thereon, a
lever having an internal worm at one end to work upon same and a fork at the
other end to embrace the boss of one of the sliding cones, and a shipper lever
for imparting a relative movement to the other sliding cone; substantially as
set forth.
3. In an adjustable pulley gear, having two parallel shafts, a fixed expandable
cone, and a rigid sliding cone upon each shaft. A shoc pivoted at the end of
each of the arms or levers of the expandable cones for carrying a belt or cord
for imparting motion from the driving shaft to the driven shaft; substantially
as set forth.
4. In an adjustable pulley gear a rigid expandable cone, consisting of a disk
secured to the shaft, a number of arms or levers attached to the periphery of
said disk, springs connected to the outer ends of said levers and to the hub of
the disks, and shoes at the inner ends of said arms or levers for carrying a
band, in combination with rigid sliding cones; substantially as and for the
purpose set forth.
Dated this 24th day of October 1899
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicants.