Improvements in Driving Gear for Lifts and Hoists.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Driving Gear for Lifts and Hoists.
We, JÖRGEN BJÖRNSTAD, and EASTON ANDERSON & GOOLDEN LIMITED, both of
Erith Iron Works, Erith, in the County of Kent, Engineers, do hereby declare
the nature of this invention to be as follows:-
This invention relates to the driving gear for lifts and hoists and has for
its object to ensure a sufficient grip between the ropes and the pulleys round
which the ropes pass that they will perform the work required in an efficient
manner and without the liability to slip.
The invention is applicable to balanced or to overbalanced lifts and hoists
driven by an electric motor, hydraulic, steam, gas or oil engine and consists in
arranging two grooved pulleys to rotate in the same plane and so that the ropes
pass from one pulley to the other pulley at such an angle that the ropes will
engage with considerably more than one half of the circumference of each pulley.
The pulley or the shafts on which they are mounted may be geared together
to ensure the simultaneous positive rotation being given to both pulleys. The
ropes may enter and leave the pulleys in opposite directions or at any desired
angle and the pulley may be provided with peripheral V grooves or with grooves
to fit the ropes.
Datad this 2nd day of T.1., 1909
Improvements in Driving Gear for Lifts and Hoists.
We, JÖRGEN BJÖRNSTAD, and EASTON ANDERSON & GOOLDEN LIMITED, both of
Erith Iron Works, Erith, in the County of Kent, Engineers, 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:—
This invention relates to the driving gear for lifts and hoists and has for
its object to ensure a sufficient grip between the ropes and the pulleys round
which the ropes pass that they will perform the work required in an efficient
manner and without slipping.
The invention is applicable to balanced or to overbalanced, lifts and hoists,
[Price 8d1

page_text: driven by an electric motor, hydraulic, steam, gas, or oil, engine; and consists
in arranging two grooved pulleys as shewn at A and B in the accompanying
drawings.
pass
Figures 1 and 2 are an elevation and a plan of an arrangement wherein the
pulleys are not geared together and Figures 3 and 4 are like views with the
pulleys geared. The said pulleys are respectively carried by the driving shaft a
and a countershaft band rotate in the same plane. The driving ropes
from one pulley to the other pulley at such an angle that the said ropes engage
with considerably more than one half of the circumference of each pulley. The
pulleys may be ungeared as in Figures 1 and 2 or they may be geared together
to ensure the simultaneous positive rotation being given to both pulleys
Figures 3 and 4 shew toothed wheels D carried by the respective shafts for
this purpose. The ropes may enter and leave the pulleys in opposite directions
or at any desired angle and the pulleys may be provided with peripheral
V grooves, or with grooves to fit the ropes.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed we wish it to be understood
that we are aware of the Specification of Letters Patent No. 16229 of 1897
granted to Alexander Bewicke Blackburn and Wilfred L. Spence and that we
do not claim anything described and claimed therein, but we declare that what
we claim is :-
1. In driving gear for lifts, or hoists, two grooved pulleys rotating in the
same plane, the ropes passing thereover in such manner that they engage with
more than half the circumference of the driving pulley; substantially as herein-
before described.
2. In driving gear for lifts, or hoists, two grooved pulleys rotating in the
same plane, and geared together, directly, and having the ropes passing there-
over; in such manner that they engage with more than half the circumference of
the pulleys substantially as herein before described.
Dated this 4th day of April 1899
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.