IMPROVEMENTS* IN HOISTING AND STEERING GEAR
Year: 1884

page_text: I ALEXANDER MELVILLE CLARK of the firm of A. M. and Wm. Clark of
53 Chancery Lane in the county of Middlesex, Fellow of the Institute of Patent
Agents do hereby declare the nature of the said invention for "IMPROVEMENTS*
IN HOISTING AND STEERING GEAR." 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 to provide a new and improved hoisting gear in
which the rope is pressed on the drum or pulley in such a manner that the rope.
can hang freely and will not slip on the pulley when released.
The invention consists in the combination with a yoke of a gear wheel and a
grooved pulley united or made integral and journalled in the yoke and of a gear
wheel and friction pulley united or made integral and journalled in the lower end
of the yoke, the gear wheels engaging and the friction pulley pressing the hoisting
rope into the grooved pulley.
The invention is illustrated in the accompanying drawings forming part of this
specification in which similar letters indicate corresponding parts in all the figures.
Figure 1 is a side view of the improved hoisting gear. Figure 2 is a longitudinal
sectional view of the same on the line X. X. figure 3. Figure 3 is an end view of
the same.
In the lower end of the yoke A. a shaft B. is journalled on which a gear wheel C,
and a friction pulley D made integral with the wheel, are mounted rigidly between
the shanks of the yoke. On one of the projecting ends of the shaft B, the pulley E,
is rigidly mounted over which the hand rope or chain F, for operating the gear,
passes. In arms G. of the shanks of the yoke A. a short shaft H, is journalled on
which are rigidly mounted a gear wheel J, engaging with the wheel C, and a
grooved pulley K made integral with the gear wheel J. The centre of the shaft H.
is slightly to one side of the centre of the shaft B so that the rims of the gear
wheels C and J will be about on the same vertical line at one side. A pulley or
roller L is journalled in arms M of the shanks of the yoke.
The hoisting rope N is passed around the grooved pulley K and partly over the
friction pulley D, the load being suspended from the strand N¹. passing over the
pulley or roller L. The strand N. hangs down loosely and passes under the pulley L.
It descends as the strand N¹ and the load ascends.

page_text: If the pulley E. is turned by means of the rope or chain F. the gear wheel C, is
turned and turns the gear wheel J. and the pulley K. The friction pulley D.
always presses the rope N into the groove of the pulley K. thus preventing the
rope from slipping when hanging free, that is to say the strand N³ need not be
held to prevent the load from drawing the strand downward.
When a load is being raised or lowered the weight slightly tilts the yoke so that
the strands N¹ N. hang vertically. The roller or pulley L prevents the weighted
strand N¹ from pressing on the strand N°. The above described device can also be
used in steering gear, the wheel or pulley E. being the hand wheel or tiller wheel.
Having now particularly described and ascertained the nature of the Baid
Invention and in what manner the same is to be performed, I declare that what
I claim is
1 In a rope gear, the combination with the grooved pulley for the hoisting rope
and the yoke in which the said pulley is journalled, of a friction pulley journalled
in the lower end of the yoke for the purpose of pressing the hoisting rope against
the rim of the grooved pulley substantially as herein shown and described.
2nd In a rope gear, the combination with the yoke of a grooved rope pulley
and a gear wheel made integral or united with each other and journalled in the
yoke, and a friction pulley made integral or united with a gear wheel journaled
in the lower end of the yoke, the gear wheels engaging with each other substantially
as herein shown and described.
3rd In a rope gear, the combination with the yoke A of the grooved rope pulley K
and the gear wheel J made integral or united and journalled in arms G of the
yoke, the friction pulley D and the gear wheel O made integral or united and
journalled in the lower end of the yoke, substantially as berein shown and
described.
4th In a rope gear, the combination with the yoke A, of the gear wheel J. and
the grooved pulley K united or made integral and journalled in the yoke, the
friction pulley D and gear wheel C mounted rigidly on the shaft B journalled in
the lower end of the yoke A, and of the hand rope pulley E. rigidly mounted on
one end of the shaft B, substantially as herein shown and described.
5th In a rope gear the combination with the yoke A. of the gear wheel J. and
the grooved pulley K united or made integral and journalled in the yoke A, the
gear wheel C and the friction pulley D united or made integral and journalled in
the yoke A, and of the pulley or roller L journalled in arms of the yoke A,
substantially as herein shown and described.
Dated this 21st day of February 1884