Loose Pulley for Driving Shafts.
Year: 1899

page_text: Date of Application, 15th Apr., 1899-Accepted, 27th May, 1899
Loose Pulley for Driving Shafts.
I, JULIUS EDUARD RICHARD SCHADT, of Kreuznach on the Rhine, in the Empire
of Germany, Merchant, 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: -
The object of this invention is a peculiar loose pulley for driving shafts which
is intended to facilitate the passing over or shifting of the driving belt on to the
fixed pulley of the driving shafts of machinery of all kind. This new loose pulley
is provided upon its periphery with a suitable number of sunk pans coiled around
the same and in which the driving belt can be easily placed in order to bring
it subsequently over the required driving pulley.
In the accompanying drawings which illustrate a loose pulley constructed accord-
ing to this invention, Figs. 1 and 2 are respectively a front view and a longitudinal
section of a loose pulley mounted besides a fixed pulley upon a driving shaft; while
Figs. 3 and 4 are plan views from the side turned away from and towards the
driving pulley respectively; Fig. 5 showing the development of the periphery of
the loose pulley. In close proximity to the fixed pulley R keyed upon the driving
shaft W is mounted on the same shaft the loose pulley L which is free to turn
thereon. It is greatly preferable to mount this loose pulley L on a sleeve H which
for the purpose of reducing the friction bears on the shaft W by means of inner
bearing rings G. To facilitate the removal of the contrivance the loose pulley L
as well as the sleeve H are divided lengthwise, the two parts thus formed being
connected together in any suitable manner by means of screws or the like after
having been first mounted on the driving shaft.
The two coiled paths 1, 11, are so formed or cut in the periphery of the loose
pulley L that between the two, which form two obtuse triangles d, d', the periphery
is retained in its original cylindrical shape, while the coiled paths 1, 1, are inclined
in their bottom surface towards the side which is away from the driving pulley.
The outer edges of the loose pulley L form thus a perfect circle in the side turned
towards the driving shaft (Fig. 4), while on the other side (Fig. 3) the outlet of
the coiled paths 7, 71, form an open notch wherein the driving belt can be readily
laid. In order to set in motion the machinery driven by the driving pulley, all
that is required is to hold on the sleeve H with its loose pulley and to place the
driving belt in one of the inlet openings of the coiled paths 1, 1. The sleeve H
being subsequently released a short turn is given to the driving belt in the direction
of rotation of the driving pulley. A quarter turn given to the loose pulley L
suffices, as the same has always a tendency to follow the direction of rotation of
the gear. With such a turn the driving belt is instantaneously drawn by the
coiled paths towards the side of the driving shaft R and over the same.
The disconnecting or throwing off of the driving belt is effected in the ordinary
manner, the loose pulley remaining standing still under the weight of the beti.
so that in order to set the machinery again in motion a short pull or tug at the
driving belt suffices to bring the same back on to its driving pulley R. The loose
רנס.D

page_text: .
pulley L as well as the sleeve H could be made of wood, metal or other suitable
material, and the number of the coiled paths 1, 1, may be varied in accordance
with the particular requirements of each case.
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.
A loose pulley L for driving shafts characterized by a suitable number of coiled
paths, formed on its periphery and having such a shape that the bottom
surfaces of the paths are deeper on the side turned away from the driving pulley
in order to facilitate the placing of the belt from this side, which belt can thus
be brought with a turn through the coiled path on to the driving pulley; the
loose pulley being made in two parts for this purpose connected together by screws
or in any other suitable manner.
Doted this 14th day of Anril 1800
CRUIKSHANK & FAIRWEATHER,
Chartered Patent Agents,
62, Saint Vincent Street, Glasgow,
Agents for the Applicant."