Year: 1886

page_text: Date of Application, 10th June, 1886
Complete Left, 4th Mar., 1887.
Complete Accepted, 5th Apr., 1887.
I, HERBERT JOHN HADDAN of 67 Strand in the County of Middlesex, Civil Engineer,
do hereby declare the nature of this invention to be as follows:-
The object of this invention is to move lifts up and down by the aid of screws in such
a manner that the screw thread serves also as a safety suspending contrivance in case
of an accident or any interruption of the working arrangement.
The screw thread may be arranged either along the circumference of a stationary
upright shaft passing through the lift and a corresponding screw nut lodged in the lift
may be set in rotation by a suitable contrivance so as to cause the lift to be raised or
lowered along the shaft; or, the screw shaft may be made revolvable and the nut fixed
rigidly to the lift.
Or again, a drum provided along its circumference with a screw thread, may be
made revolvable on the lift, and gear into vertical toothed racks arranged at suitable
intervals on the walls of the well in which the said lift is actuated. In the latter case,
the drum with screw thread has a somewhat larger diameter than the lift, so that a
perfectly free space is obtained in the lift for receiving persons or loads. The pitch of
the screw threads and the number of the latter are so proportioned as to give a
sufficiently rapid movement to the lift, without however in case of an accident to the
working mechanism, allowing the lift to fall by its own weight, the latter being held
up by the friction between the screw nut and shaft or toothed racks.
The revolvable part (in the former case the nut in the latter the screw drum) is
lodged at the underside of the lift and friction pulleys are arranged between the lift and
this revolvable part to lessen the friction.
The motion is suitably produced by a belt arranged vertically along the length of
the well and passing to the pulley of the impulsion screw, between two small
pulleys arranged at the side of the lift, the controlling being effected from the interior
of the lift.
HERBERT JOHN HADDAN.
Pp. Herbert & Co.,
67, Strand, W.C.,
Agents.

page_text: COMPLETE SPECIFICATION.
Improvements in Lifts.
1, HERBERT JOHN HADDAN, of 67 Strand, in the Conniy of Middlesex, Civil Engineer,
do hereby declare the nature of this invention, a communication to me from abroad by
Carl Heyer of Ottensen, in the Kingdom of Prussia, Engineer, 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 move lifts up and down by the aid of screws in
such a manner that the screw-thread serves also as a safety suspending contrivance in
case of an accident or any interruption of the working arrangement.
The screw thread may be arranged either along the circumference of a stationary
upright shaft passing through the lift and a corresponding screw nut lodged in the lift
may be set in rotation by a suitable contrivance, so as to cause the lift to be raised or
lowered along the shaft or the screw shaft may be made revoluble and the nut fixed
rigidly to the lift or again a drum provided along its circumference with a screw
thread may be made revolvable on the lift, and gear into vertical toothed racks arranged
at suitable intervals on the walls of the well in which the said lift is actuated.
In the latter case, the drum with screw thread has a somewhat larger diameter than
the lift so that a perfectly free space is obtained in the lift for receiving persons or
loads.
The pitch of the screw threads and the number of the latter are so proportioned as
to give
a sufficiently rapid movement to the lift, without however, is case of an accident
to the working mechanism, allowing the lift to fall by its own weight, the latter being
held up by the friction between screw nut and shaft or toothed racks.
The revolvable part, in the former case the nut, in the latter the screw drum, is
lodged at the underside of the lift and friction pulleys are arranged between the lift
and this revoluble part to lessen the friction.
The motion is suitably produced by a belt arranged vertically along the length of
the well and passing to the pulley of the impulsion screw, between two small pulleys
arranged at the side of the lift, the controlling being effected from the interior of the lift.
Referring to the accompanying drawing
Fig. 1 is a vertical section of a lift operated upon a rigid central shaft.
Fig. 2 is a horizontal section thereof.
Fig. 3 is a vertical section of the same showing the method of driving.
Fig. 4a vertical section and Fig. 5 a horizontal section of the same with
modifications.
Fig. 6 is a vertical section and Fig. 7 a horizontal section showing a lift operated
on racks fixed to the walls of the well.
Fig. 8 is a vertical section showing means for driving the same.
Fig. 9 is a vertical section and Fig. 10 a horizonial section showing means for
operating the lift from the interior of the latter.
In Figs. 1 to 5 the lift A is guided vertically or otherwise in the well P on the rail or

page_text: rails, which prevent the lift from turning. A threaded nut M gearing on the stationary
central shaft which passes through the lift and is provided with screw thread, carries
the lift on the friction pulleys e. In Figs. 4 and 5 these pulleys are journalled on the
plate i fixed or formed on the nut M while in Figs. 1-3 the pulleys are journalled in
brackets fixed to the underside of the floor of the lift and gear into a ring shaped groove
on the rim of the nut M. The nut may be actuated by means of a motor placed in the
lift, or by transmission by a belt from outside the lift. The latter arrangement is
shown in Figs. 1-3 and may have the following construction:
An axle journalled in bearing m m depending from the floor of the lift, carries the
three pulleys and p², which are all loosely arranged on w. Over the middle pulley
is led the belt R travelling vertically in the well over pulleys d d and deflected
over the two pulleys and d³ journalled at the bottom of the lift. The strap w imparis
motion to the strap R from a stationary motor. To cause the lift to rise the strap Ris
guided from the middle pulley p' to the disc p by the fork lever from inside the lift,
whereby a tooth wheel o connected with p sets in rotation the tooth wheel o' and there-
fore the bevel wheel o secured on the same shaft with o'. The bevel wheel o² gears
into the upper bevel wheel on the nut M by which means the nut rises on the shaft s
and raises the lift A.
If the lift is to be lowered, the belt R is shifted on the pulley whereby the tooth
wheel connected with 2 moves the wheel and therefore the bevel wheel on the
same shaft with and this bevel wheel gears into the bevel wheel c¹ on the nut M
and moves the nut in a direction contrary to that given by bevel wheel o² so that the
lift descends.
In the arrangement shown in Figs. 4 and 5 a motor (driven by steam, gas, elec-
tricity etc) is placed in the lift and moves with the same. The motor is adapted to
turn the nut M in either direction through the bevel wheel 9 which gears into the bevel
wheel e² of the nut, so that the lift may be raised or lowered.
In Figs. 6 to 10 the lift A is guided in the well by aid of pulleys for in any other
suitable manner. Below the floor is guided on the lift a screw S in such a manner
that the lift is supported by the screw & by means of friction pulleys ee with radial
shafts. The outer diameter of the screw S is larger than the diameter of the lift, if the
latter is circular, or is larger than the breadth of the lift, if the latter is of angular
construction so that the screw can gear into the vertical tooth racks fixed on the walls
of the pit. When the screw S is set in motion by any suitable motor, it rises or
descends on the tooth racks corresponding to the direction of the revolution.
The pulleys e may as shown by Figs. 6-8 gear into a groove of metal ring m
fastened to the bottom of the lift or they may bear upon a flat rail arranged on the
bottom of the lift, and a separate guide ring or portions of such ring o as shown in
Figs. 9 and 10 be employed, for the purpose of causing the lift to follow the screw
when descending.
The screw S may be turned by means of a motor placed in the lift, or by a belt from out-
side the lift. In the latter case the, arrangement shown in Fig. 8 may be employed. On the
lower side of the plate of the screw. S is arranged a bevel wheel c, into which gear the two
driving wheels d and d' which are stated diametrically opposite at the extremities of the
shaft and of the sleeve lodged volvably on w (Fig. 6). The bearing blocks / and /
carry the shaft w and sleeve h. Tie pulley p is fixed on the shaft and the pulley p
is loosely journalled thereon, while the pulley p is fixed on the sleeve. The belt R
is deflected over pulleys did is impelled by a motor through strap u or in any other
suitable manner. This stra; passes over the loose pulley p' as shown by the drawing.
To cause the lift to ascend he belt R is shifted by means of the fork lever y from the
loose pulley onto the pulley by which means power is applied on the bevel wheel d.
To cause the lift 5 descend, the belt is shifted on to the pulley p² so that power is
now applied on te bevel wheel which turns the screw in the contrary direction.
If the motons arranged in the lift as shown by Figs. 9 and 10, it may be geared
ne screw S through the bevel wheel which may be revolved in either direction
and which gears with the bevel wheel c¹ of the screw.

page_text: Having now particularly described and ascertained the nature of said invention and
in what manner the same is to be performed, I declare that what I claim is :-
For operating lifts-
1. A nut M adapted to revolve below the lift and to be displaced on a vertical shaft.
passing through the lift and provided with screw thread, and to be set in rotation for
this purpose in either direction, by a belt from outside the lift or by a motor arranged
within the lift.
2. For operating lifts, a screw S adapted to revolve below the lift and gearing into
vertical tooth racks on the walls of the well of the lift and adapted to be revolved by a
belt from outside the lift, or by a motor, arranged in the lift, in either direction and
thereby raise or lower the lift.