IMPROVED SAFETY WINDING APPARATUS FOR LIFTS AND PURPOSES
Year: 1875

page_text: LETTERS PATENT to Alexander Melville Clark, of 53, Chancery Lane,
OTHER BIMILAR
in the County of Middlesex, Patent Agent, for the Invention of
"IMPROVED SAFETY WINDING APPARATUS FOR LIFTS AND
PURPOSES."-A communication from abroad by Volney William
Mason, of Providence, State of Rhode Island, United States of
America.
PROVISIONAL SPECIFICATION left by the said Alexander Melville
Clark at the Office of the Commissioners of Patents, with his
Petition, on the 9th July 1875.
I, ALEXANDER MELVILLE CLARK, of 53, Chancery Lane, in the
County of Middlesex, Patent Agent, do hereby declare the nature of
the said Invention for "IMPROVED SAFETY WINDING Apparatus
AND OTHER SIMILAR PURPOSES." to be as follows :-
FOR LIFTS
This Invention relates to improved safety winding apparatus for lifts

page_text: apparatus and stop motion in combination with friction clutch pulleys
for transmitting the power. All the parts are supported in a single
iron hanger or frame so constructed that the bearings are less liable
to get displaced or out of line than when bolted in separate parts
to the wood framework. There are two friction clutch pulleys, one
at either end of the worm shaft that gears with the worm wheel on the
winding drum. These pulleys serve to transmit power from the motor
to the winding drum, and for lifts and such like purposes the band on
the one pulley is usually open and the other crossed; but in some cases
both belts may be alike, as for changing speed of machinery.
The pulleys are loose on the shaft, and are each constructed as
follows: Two segments corresponding to the internal circumference
of the pulley are so arranged and jointed to toggle bars connected to a
sleeve on the shaft that by moving said sleeve the segments are caused
to move outwards and abut against the surface of the pulley, which
thus, through the segments, toggles, and sleeve, becomes fast on the
shaft.
The sleeves of the two pulleys are connected by a sliding shipper bar,
and are both operated at once, so that when one clutch is shipped the
other is unshipped, or both may be unshipped at once in order to stop
'the machine. This sliding shipper bar is itself operated either by the
usual stop motion provided in the hatchway on the shipper rope, or by
an independent stop motion actuated from the shaft of the winding
drum itself, the latter coming into operation and serving to prevent
accident in case the former should become disarranged. In either case
it is effected through the agency of a rock shaft having a crank working
in a slot in the sliding shipper bar, so that the latter is locked in position
when thrown to the one side or the other.
This independent stop motion consists of a disc having a volute scroll
cut from a point near its centre to its circumference. This disc is loose
on the rock shaft, and is driven by gearing from the winding drum
shaft, so that when the winding drum revolves it revolves also. There
_ is another wheel, which I term the shipper wheel, fast on the rock
_shaft, round which the shipper rope passes, and in a radial slot in this
wheel there is a shoe which engages with the volute scroll, and is
thereby caused to traverse to and fro in the slot from the centre to the
circumference and vice versa. On the scroll wheel there are also

page_text: adjustable stops, which when the shoe comes in their path strike the
same and cause the shipper wheel to be carried round with the scroll
wheel, thereby actuating the shipper rock shaft and moving the sliding
shipper bar to unship the clutch which is driving.
Another feature of the Invention relates to stopping the revolving
worm shaft promptly at the same time the clutch is unshipped. This
is accomplished by means of a brake bearing against the worm which
drives the winding drum. This brake block is fitted in the oil receptacle,
attached to one side of which is a bolt made adjustable to regulate the
pressure of the brake against the worm. The bolt is provided with á
cam strap, which encircles a cam on the shipper rock shaft, so that the
same movement of this shaft which throws the shipper bar also operates
simultaneously to draw up the brake against the worm to stop the
révolution of the worm shaft, thereby preventing the lift from travelling
past the point where it should stop at the top or bottom of the hatch-
way, or at any intermediate point where it is required to stop.
י
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Alexander Melville Clark in the Great Seal, Patent
Office on the 8th January 1876.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ALEXANDER
MELVILLE CLARK, of 53, Chancery Lane, in the County of Middlesex,
Patent Agent, send greeting.
".
WHEREAS Her most Excellent Majesty Queen Victoria, by. Her
Letters Patent, bearing date the Ninth day of July, in the year of our
Lord One thousand eight hundred and seventy-five, in the thirty-ninth
year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said Alexander Melville Clark, Her special
license that I, the said Alexander Melville Clark, my executors, admini-
strators, and assigns, or such others as I, the said Alexander Melville
Clark, my executors, -administrators, and assigns, should at any time
agree with, and no others, from time to time and at all times thereafter
during the term therein expressed, should and lawfully might make, use,
exercise, and vend, within the United Kingdom of Great Britain and

page_text: 16
Ireland, the Channel Islands, and Isle of Man, an Invention for 'IMPROVED
SAFETY WINTING APPARATUS FOR LIFTS AND OTHER SIMILAR PURPOSES," &
communication to me from abroad by Volney William Mason, of
Providence, State of Rhode Island, United States of America, upon the
condition (amongst others) that I, the said Alexander Melville Clark, ¦
my executors or administrators, by an instrument in writing under my,
or their, or one of their hands and seals, should particularly describe
and ascertain the nature of the said Invention, and in what manner
the same was to be performed, and cause the same to be filed in the
Great Seal Patent Office within six calendar months next and imme-1
diately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Alexander Melville Clark, do hereby
declare the nature of the said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and
by the following statement, reference being had to the two accompanying
Sheets of Drawings, and to the letters and figures marked thereon, that is
to say:-
This Invention relates to improved safety winding apparatus for lifts
and such like purposes, and it consists chiefly in an improved shipping
apparatus and stop motion in combination with friction clutch pulleys
by which power is transmitted to the winding drum.
It also consists in the employment in combination with the foregoing
of a brake operated as hereafter described.
Also of an improved construction of hanger or frame.
In order that the Invention may be more readily understood I have
illustrated it in the accompanying Drawings, in which,–
-
Figure 1 represents a perspective view of the apparatus complete as
bolted to floor beams overhead.
Figure 2 represents the apparatus in section taken along the longi-
tudinal axis of the winding drum.
Figure 3 shows a transverse section of one of the friction clutch
pulleys; and Figure 4 shows a face view of the same on a larger scale.
All the working parts of the apparatus are supported in a single iron
frame or hanger so constructed that the bearings are less liable to get

page_text: out of line than when bolted in separate parts to the wood supports.
The hanger consists of two cast-iron frames A connected rigidly together
by three bolts B, the two upper bolts having shoulders inside against
which the frames A bear when the outside nuts are screwed up, and the
lower bolt being encased by the sheath or pipe C so that by removing
the nut at either end the bolt may be drawn out and the sheath C
removed to enable any part of the machine to be renewed when required;
D is the shaft of the winding drum mounted in bearings in frames A;
upon this shaft are fixed the winding drum F and a worm wheel E
which gears with a worm M' on a shaft M mounted in bearings, as
shown, and by which drum F is driven as usual. P, P, are two friction
clutch pulleys, one on either end of shaft M. These pulleys serve to
transmit power from the motor to the winding drum F, and for lifts and
such like purposes the band on the one pulley is usually open and that
on the other crossed, but in some cases both belts may be alike, as for
changing the speed of the machinery.
The pulleys P are loose on the shaft and are each provided with
friction clutches constructed as follows:-Two segments R, R, (Figures 3
and 4) of the form shown, whose faces a correspond to the internal
surface of the rim of the pulley are fitted to slide in guides S, S,
fixed to a boss 1 on shaft M; T, T, are toggle bars connected to the
segments R and to a common sleeve U on the shaft M by ball-and-
socket joints, as shown, the parts being so arranged that by moving
sleeve U along shaft M towards the pulley the segments are caused to
move outwards until their faces a abut against the rim of the pulley,
which thus through the segments R, toggles T, and sleeve U becomes
fast on the shaft, and by moving sleeve U in the contrary direction the
pulley becomes loose again.
The sleeves of the two pullies are connected by a sliding shipper bar V
having adjustable forks embracing the sleeves which are both operated
at once, so that when one clutch is shipped the other is unshipped, or
both may be unshipped at once in order to stop the machine. This
sliding shipper bar V is itself operated either by the usual stop motion
provided in the hatchway on the shipper rope (of which Z is a portion
passing round the shipper wheel K), or by an independent stop motion
actuated by from the shaft of the winding drum itself, the latter coming
into operation and serving to prevent accidents in case the former should

page_text: become disarranged. In either case it is effected through the agency of
a shaft L, upon one end of which the shipper wheel K is keyed, and at
whose other end there is a crank L' working in a vertical slot in the
horizontal sliding shipper bar V. By means of this crank and slot
the shipper bar is locked in position when thrown to the one side or the
other.
"
The independent stop motion of this Invention above referred to
consists of a scroll wheel or disc I bolted to a gear wheel H, both turning
loose on shaft L, and receiving motion from the winding drum shaft D
by a pinion G keyed thereon meshing with pinion H; so that when the
winding drum revolves disc I revolves also. This stop motion disc I
has a volute scroll cut in its face, as shown, from a point near its centre
to the circumference. J is a sliding block fitted in a radial slot in one
of the arms of the shipper wheel K, and engaging by a lug with the
volute scroll in disc I, by which it is caused to traverse inwards or
outwards along in the slot, according to the direction of the winding
drum, and consequently the scroll wheel revolve. On this scroll wheel
there are also fixed two adjustable stops W, one near the centre and the
other near the circumference, or in any intermediate position, according
to the height at which it is desired to stop the lift or other apparatus to
which the Invention is applied. When J in its motion in the slot
comes in the path of either of these stops the shipper wheel K is carried
round with the scroll wheel I, whereby the shaft L is partly rotated, and
the sliding shipper bar V moved to unship the friction clutch pulley
which is driving.
Another important feature of this Invention relates to stopping the
revolving worm shaft M promptly at the same time that the clutch is
unshipped. This is accomplished by means of a brake X showed bearing
against the worm in the oil receptacle N. This oil receptacle is attached
at one side by a set screw to the framing, and at the other to a bolt O
made adjustable by two check nuts to regulate the pressure of the break
shoe against the worm M². The upper end of the bolt is provided with
a cam or eccentric strap, which encircles a cam or eccentric Y on the
shaft L, so that the same movement of this shaft which throws the
shipper bar also operates simultaneously to draw up the brake X against
the worm' to 'stop the revolution of the shaft M, thereby preventing the
lift- from travelling past the point where it should stop, at the top or

page_text: required to stop.
It will be evident that the several separate parts of this Invention
may be modified, each or either of the devices being susceptible of
combination with other devices or mechanism to accomplish substantially
the same results, therefore I do not limit my claim to the specific
combination described.
Having described the nature of the
performing the same, I declare that
Invention, and the manner of
what I claim as the Invention
to be protected by the herein-before in part recited Letters Patent
is,-
-
1st. The improved construction of hanger, consisting of two frames
connected by screw bolts, the upper ones provided with shoulders, and
the lower one with a sheath, as and for the purpose specified.
2nd. The combination with the pair of friction clutch pulleys P, P,
constructed and operating as shown and described, of the shipping or
reversing mechanism, consisting of the shipper bar V connected to the
clutch sleeves and actuated by crank shaft L and shipper wheel K as
described, the whole applied as and for the purpose set forth, whether
operated by the rope Z or by the self-acting stop motion.
3rd. The combination with the friction clutch pullies and the shipping
or reversing mechanism as above specified of the self-acting stop motion,
consisting of the scroll wheel I driven by shaft D, adjustable stops W
thereon, and block J sliding in slot in shipper wheel K, and gearing
with volute scroll in wheel I, the whole arranged and operating sub-
stantially as and for the purpose set forth.
4th. The combination with the above specified friction clutch pulleys,
shipping or reversing mechanism, and self-acting stop motion of the
brake acting on worm M², and operated by a cam or eccentric on
shipper wheel shaft L, substantially as and for the purpose shown and
described.
Lastly. The use or application of either of the devices described for
starting stonning

page_text: to attain similar results on hoisting machinery or for stopping and
starting or changing speed or reversing machinery.
In witness whereof, I, the said Alexander Melville Clark, have
hereunto set my hand and seal, this Eighth day of January,
in the year of our Lord One thousand eight hundred and seventy-
six.