Improvements in Hoists, Winding Gear, and the like.
Year: 1899

page_text: Date of Application, 20th Apr., 1899
Complete Specification Left, 20th Jan., 1900-Accepted, 10th Mar., 1900
.
PROVISIONAL SPECIFICATION.
Improvements in Hoists, Winding Gear, and the like.
We, JOHN CHARLES HOWELL, of 24, Queen Victoria Street, in the City of London,
Electrical Engineer, and THOMAS HUMPAGE and HERBERT INNES JACQUES, both
of Luckwell Works, Ashton Gate, Bristol, Engineers, do hereby declare the nature
of this invention to be as follows:-
This invention relates to certain improvements in hoists, winding gear and the
like.
In carrying out the invention we employ an electric motor for operating the hoist
or the like which renders it necessary of course to employ a reducing or differential
gear as the revolutions of the motor shaft would otherwise be too rapid. It is
therefore proposed where a high speed motor is employed-and such a motor has
considerable advantages-to use a differential gear preferably the gear described in
the Specification of Letters Patent No. 20,542 of 1892 or other effective gear. With
this gear we place preferably between it and the hoist a frictional driving and brake
mechanism consisting of double acting toggles having friction holding faces carried
by the hoist operating shaft, which toggles may engage or hold against a driving
dise or the like connected with the reduced speed side or part of the gear while in
one position, and while in another position may engage or hold against a fixed brake
disc or ring.
It is preferable that the toggles shall normally engage with this latter part, in
order that the hoist may be self-sustaining and this we may effect by means of a
suitable spring. When the toggles are shifted to the other or driving disc they
must be held against. the action of the spring while the driving takes place. In the
case of what is known as a Shaw sack hoist this may be done through the lever which
moves the hoist drum to bring it usually into engagement with the driving gear, and
to a point on which lever we may attach the spring.
1
"1 1000
PHILIP M. JUSTICE,
Chartered Patent Agent, 55 & 56, Chancery Lane, London,
For the Applicants.
• Improvements in Hoists, Winding Gear, and the like.
We, JOHN CHARLES HOWELL, of 24, Queen Victoria Street, in the City of London,
Electrical Engineer, and THOMAS HUMPAGE and HERBERT INNES JACQUES, both of
Luckwell Works, Ashton Gate, Bristol, 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 a certain improvement in hoists, winding gear, and the
like, the object of the invention being to provide a compact and handy hoist or the
like capable of being operated from an electric motor through a reducing gear and
..

page_text: so arranged that the hoist or the like may be self sustaining as to its load and that
the motor may be capable of being started without any load, which can be
afterwards gradually put on.
The invention is illustrated in one form in the accompanying drawing which
represents an elevation partly in section of the motor, reduction gear, braking and
driving rings and hoisting drum.
In this drawing a represents an electric motor, 6 the reduction gear, c the braking
and driving rings and the hoisting drum.
The reduction gear bis preferably of the class described in Specification to Letters
Patent No. 20542 of 1892 and consists of a bevel gear wheel B carried by the fast
running shaft a¹ of the motor, a bevel gear wheel D loosely mounted on a stud at an
angle to said wheel B and gearing therewith and with a stationary gear K secured
to the cover plate of the gear casing 62. The gear D carries a gear E fixed to it
or forming part of same and both run freely on the stud which is in turn carried
by a spindle b³ which can turn freely in the fast running shaft a¹ and in the slow
running shaft 64 which carries a bevel gear wheel M engaging with the bevel gear E.
The wheels E and D are duplicated as shewn to secure a better balance for the gear.
The shaft bt carries a driving disc or ring c¹ between which and a similarly shaped
braking disc or ring c is situated a toggle arm chaving two friction holding
faces ccone being adapted to engage with the interior surface of the driving
disc c¹ and the other with the interior surface of the braking disc c² alternately.
The toggles of which there are preferably a set arranged on opposite sides of the
shaft d of the drum dare pivotally attached to a boss d² on the end of said shaft
and are provided with a projection or rounded nose which separates. the two
discs and the rounded surfaces of which work against the edges of the discs when
the toggles are rocked, the object of the device being to support and steady the
toggles at their outer ends. The disc c² is fixed in some suitable way as by
bolting to a lug c on one of the bearing pillars. -
The shaft d' is supported in bearings e and is capable of longitudinal movement
therein. The drum d is secured on such shaft or the shaft may slide in the drum so
long as it is capable of turning it and said shaft is provided with a collar 23 which is
partly embraced by the operating lever f. This lever is bolted to a disc g, which is
provided with cross slots 1 by which the lever may be set in different positions
according to the position in which the hoist, is fixed. The lever may be operated by
a rope or chain so that it may be worked from a distance. The disc I, is rigidly
connected to an arın h which may project into the hollow base plate i and to which
is attached a spring the other end of which is secured to a hook bolted to a
block m secured to the base or otherwise attached to some fixed point. The pull of
this spring forces outwardly the end of the lever fembracing the collar d³ of the drum
thus moving the drum to the right with the result that the faces of the toggles c³
are pressed against the inside of the brake disc or ring e² and the drum is held, this
being the normal position of the parts, so that a load carried by the drum may be
sustained to any point which is of advantage in the event of a breakage of any part
of the driving mechanism.
The driving mechanism which includes the disc or ring c¹ may be kept constantly
running if desired and to put the hoist in action the lever is pushed over so as to
remove the face from disc c² and put the face e gradually into contact with the
rotating disc or ring c¹.
To lower the load the same operation is performed but the lever is only put over
sufficiently far to partly release the face cs of the toggle from the braking disc by
which means the load can be gradually lowered, the operator keeping the same well
under control by increasing the braking action when desired.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. In a hoist, a motor, a reducing gear connected to same a part driven through

page_text: the reducing gear, a fixed braking part separated from the driven part, a drum,
means for supporting same and means connected to the drum for alternately engaging
frictionally with the driven part and the braking part substantially as described.
2. In a hoist having a reduction gear a part driven through the gear a fixed part
separated from the first a shaft on which the drum is supported, means for shifting
said shaft laterally toggles carried by said shaft and friction faces on said toggles
adapted to be brought into contact alternately with the driven part and the braking
part substantially as described.
3. In a hoist a driven disc, a fixed disc separated from said driven disc, a shaft
moveable laterally on which the drum is supported, toggles carried by said shaft
friction faces carried by said toggles adapted to be brought into contact alternately
with the driven disc and the braking disc, a lever controlling the shaft and a spring
adapted to maintain the shaft normally in one position so as to hold the toggles
against the braking disc substantially as described.
4. The improved hoist constructed substantially as described and illustrated.
Dated this 19th day of January 1900.
PHILIP M. JUSTICE,
55 & 56, Chancery Lane, London, Chartered Patent Agent,
For the Applicants.