Improvements in or relating to Lifts, Hoists, and the like.
Year: 1898

page_text: Date of Application, 14th May, 1898
PROVISIONAL SPECIFICATION.
Improvements in or relating to Lifts, Hoists, and the like.
I, WILLIAM ROBERT HAY, of No. 7 Eddystone Road, Crofton Park, Brockley,
London, S.E., Engineer, do hereby declare the nature of this invention to be as
follows:.
The object of my invention is to automatically stop the lifting of loads in
friction, hydraulic, electric, belt driven, or other power driven hoists and the
like at any desired time or height, so as to prevent accidents from overwinding.
For this purpose, in the case of friction hoists, I have the following arrangement;
one end of the shaft upon which the winding barrel is fixed, revolves in a hole
bored in and out of the centre of a circular block or eccentric which turns in a
bearing on the hoist frame. To this eccentric bearing I attach a controlling lever
for partially rotating this block in its bearing, and so put the winding barrel in or
out of action with the friction wheel driving the same.
The end of the winding
barrel shaft projects through this bearing and has a mitre wheel
fixed thereon, which gears into a second mitre wheel fixed at one
end of a screw, which turns in cuitable bearings on, the controlling
lever. This screw carries a nut formed so that it slides on the lever to prevent it
turning on the screw, along which it travels for the full length of same.
the outer end of this screw there is pivotted a suitably formed catch, which engages
with the inner end of a second lever, pivotted to the outer end of the controlling
lever, and forming a continuation of same. The operation of this arrangement
is as follows:-
At
While
A hand or controlling rope is fixed to the end of the controlling lever, and
passes over a sheave to the hands of the operator. For lifting a load the hand-
rope is pulled down tight, so as to raise the controlling lever, and give partial
rotation to the eccentric bearing in the frame, so as to put the winding barrel in
action with the friction wheel for lifting the load in the usual manner.
the load is being wound up, the screw on the controlling lever is being rotated by
the winding barrel shaft and mitre wheels connected to same; and the nut on the
screw is thus traversed along the same until it comes in contact with the catch at
the end; which it raises, and releases the second lever; which, with the controlling
lever will drop at the pivotted joint and bring the hoist wheel on to the brake
and thereby arrest the hoist and the load from further ascension; this is done
quite independently of the operator, as the hand rope so far has not been interfered
with in any way. In order to land in the load, the hand rope is pulled slightly,
this will raise the controlling lever, and allow the load to run out. In order to
stop the hoist the hand rope is slacked right out, when the second lever will
descend below the horizontal line of the controlling lever to which it is pivotted,
will press the catch into position for holding the two levers in a straight line:
and when again used for hoisting will be ready for action. This arrangement can
be used on any machine worked by a lever, and can readily be adjusted to arrest
the load at any height.

page_text: In the case of hydraulic, electric, or belt driven hoists or lifts, I have the
following arrangement; the shaft carrying the winding barrel revolves in an
ordinary bearing on the hoist frame, and is made sufficiently long to carry loosely
on same a hand rope wheel, with which a connection is made to the gear for
stopping and starting the hoist. Fixed on the barrel shaft outside the hand rope
wheel, I have a mitre wheel which gears into a second mitre wheel fixed near the
centre of a screw, each end of which turns in suitable bearings in the periphery
of the hand rope wheel. This screw carries two nuts arranged to slide on bars
or slides attached to the rope wheel to prevent the nuts turning on the screw, to
the outer ends of which they travel in which ever way the machine may be running.
This screw and nuts are driven by the barrel shaft and mitre wheels, in the
same manner as the first arrangement; and when the nuts have travelled on the
screws to the ends of same they come in contact with the periphery of the rope
wheel and cause it to turn, and automatically stop the hoist, by actuating the gear
controlling the motion of the hoist. The slides upon which the nuts travel, I prefer
to make movable, so that they can be temporarily removed to allow the nuts to
be adjusted on the screw to any desired position thereon, so as the hoist may be
arrested at any suitable height."
Dated this 13th day of May 1808
H. WALKER HILL,
2, Church Gate, Nottingham', Agent for the Applicant.
Improvements in or relating to Lifts, Hoists, and the like.
I, WILLIAM ROBERT HAY, formerly of No. 7, Eddystone Road, now of
No. 40, Merritt Road, both in Brockley, London, S.E., 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:-
The object of my invention is to automatically stop the lifting of loads in
friction, hydraulic, electric, belt driven, or other power driven hoists, and the like
at any desired time or height, so as to prevent accidents from overwinding.
For this purpose, in the case of friction hoists, I have the following arrange-
ment; one end of the shaft upon which the winding barrel is fixed, revolves in a
hole bored in--and out of the centre of a circular block or eccentric which turns
in a bearing on the hoist frame. To this eccentric bearing I attach a controlling
lever for partially rotating this block in its bearing, and so put the winding
barrel in or out of action with the friction wheel driving the same.
The end of the winding barrel shaft projects through this bearing, and has a
mitre wheel fixed thereon, which gears into a second mitre wheel fixed at one end
of a screw, which turns in suitable bearings on the controlling lever. This
screw carries a nut formed so that it slides on the lever to prevent it turning on
the screw, along which it travels for the full length of same. At the other end of
this screw there is pivotted a suitably formed catch, which engages with the
inner end of a second lever, pivotted to the outer end of the controlling lever,
and forming a continuation of same. The operation of this arrangement is as
follows: A hand or controlling rope is fixed to the end of the controlling lever,
and passes over a sheave to the hands of the operator. For lifting a load the
hand rope is pulled down tight, so as to raise the controlling lever, and give partial
rotation to the eccentric bearing in the frame, so as to put the winding barrel in
action with the friction wheel for lifting the load in the usual manner. While
the load is being wound up, the screw on the controlling lever is being rotated by

page_text: the winding barrel shaft and mitre wheels connected to same; and the nut on the
screw is thus traversed along the same until it comes in contact with the catch
at the end which it raises, and releases the second lever which, with the controlling
lever will drop at the pivotted joint and bring the hoist wheel on to the brake, and
thereby arrest the hoist and the load from further ascension; this is done quite
independently of the operator, as the hand rope so far has not been interfered
with in any way. In order to land in the load, the hand rope is pulled slightly,
this will raise the controlling lever, and allow the load to run out.
In order to stop the hoist the hand rope is slackened right out, when the second
lever will descend below the horizontal line of the controlling lever to which it
is pivotted, will press the catch into position for holding the two levers in a straight
line; and when again used for hoisting will be ready for action.
This arrangement can be used on any machine worked by a lever, and can be
readily adjusted to arrest the load at any height.
In the case of hydraulic, electric, or belt driven hoists or lifts, I have the
following arrangement; the shaft carrying the winding barrel revolves in an
ordinary bearing on the hoist frame, and is made sufficiently long to carry loosely
on same a hand rope wheel, with which a connection is made to the gear for
stopping and starting the hoist. Fixed on the barrel shaft outside the hand rope
wheel, I have a mitre wheel which gears into a second mitre wheel fixed near the
centre of a screw, each end of which turns in suitable bearings in the periphery
of the hand rope wheel. This screw carries two nuts arranged to slide on bar's
or slides attached to the rope wheel to prevent the nuts turning on the screw, to
the outer ends of which they travel in whichever way the machine may be running.
This screw, and nuts are driven by the barrel shaft and mitre wheels, in the
same manner as the first arrangement; and when the nuts have travelled on the
screws to the ends of same, they come in contact with the periphery of the rope
wheel and cause it to turn, and automatically stop the hoist, by actuating the gear
controlling the motion of the hoist. The slides upon which the nuts travel, I prefer
to make movable, so that they can be temporarily removed to allow the nuts to
be adjusted on the screw to any desirable position thereon, so as the hoist may be
arrested at any suitable height.
In order that my said invention may be more fully understood and readily
carried out and into effect, I shall now proceed more particularly to describe the
same; and for that purpose shall refer to the figures on the annexed two sheets of
drawings, whereon the same letters of reference indicate corresponding parts in all
the figures.
Fig. is an elevation of my invention as applied to a hoist controlled by a
lever.
Fig. 2 is plan of the above.
Fig. is an elevation of my invention as applied to a hoist controlled by a
hand or rope wheel.
Fig. 4 is a plan of the above.
Referring to Figs. 1 and 2, A is the reduced end of the winding barrel shaft
after passing through the eccentric B, which turns in a suitable bearing on the
hoist frame.
The lever C, C for giving a movement to the eccentric B, is in two lengths,
jointed together by the pin F; the first length C has its end turned downwards to
receive the weight necessary to give sufficient brake power, a cord being attached to
the end of the second length Cat the hole C² for operating the lever. A screw D
is fixed on the side of lever C by suitable bearing brackets E. E and this
screw is made to revolve by the mitre wheels G, G¹, one being keyed to the shaft A,
and one to the screw D. On this screw is a nut H, and any movement of the
winding barrel will cause the nut H to traverse on the screw towards the trigger
pawl I, which it presses out of a holding position for the lever C; both levers at
once then drop at the jointed centre F, and thereby stop the hoist by taking the
hoist wheel out of gent with the driving wheel, and bringing it on to the brake:

page_text: A further pull on the controlling rope will raise the levers for reversal of the
.hoist, and at the same time the nut H is wound backwards. On slacking out to
stop further descent, the lever C¹ drops into a straight line with the lever C, and
at the same time re-sets the pawl I which holds the whole as one rigid lever. It
is then ready for the hoisting of the next load. The arrangement is perfectly
automatic, and the hoist is worked in the ordinary manner; and by moving the
nut H on the screw D) it can be adjusted to suit any height of lift.
make it double-acting by having a second trigger connected to the first by a light
bar or rod, the nut H travelling between the two; this would prevent overwinding
whichever way the hoist was travelling.
may also
In Figs. 3 and 4, A is the reduced end of the winding drum shaft, B is the hand
controlling rope pulley or wheel turning freely on the shaft A, a connection
being made from the wheel B to the belt shifter, steam valve, or electric switch for
operating the stopping and starting mechanism as required by the various
powers. C is a circular plate with central boss C' secured to the shaft A and
revolving with the same; D is a screw having one end bearing in the boss C¹,
and the other bearing in a projecting lug (2 on the periphery of plate C. The
screw being caused to revolve by the mitre wheels G, G', one being fixed to
the screw D, and the other to the wheel B. On the screw D, I have a nut, which
when the screw D) is turned in one direction comes in contact with the trigger I,
and when wound in the opposite direction comes in contact with the trigger I¹,
pressing them outwards together with the spring band K or K' as the case may be.
These springs K and K are attached to pawls L and L' respectively, and are
thereby brought into gear with the notched rim B₁ of the wheel B, the same being
carried round so far as to stop the further movement of the hoist in that direction.
A reversal of the wheel B starts the machine in the opposite direction, the pawl
is released at the same time, and the nut H is again started to perform the same
operation by means of the other pawl or trigger. The hand wheel B is at all times
free for controlling the hoist in the usual manner.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is―
1st. In lifts, hoists, and the like, the combination of the jointed lever C, for
controlling the action of same by hand, with the screw D, the mitre wheels G, G',
the nut H travelling thereon, and one or more pawls I in Figs. 1 and 2 to hold
the lever rigid for the purposes mentioned, and substantially as hereinbefore
described and shown on the drawings herewith.
2nd. In hoists and lifting machines, controlled by a rope wheel, the combination
of the disc C, screw D, nut H and pawls or triggers I, II with the notched
part of the rope wheel B; all for the purposes named, and substantially as
herein set forth and illustrated in the accompanying drawings.
3rd. The several arrangements and construction of parts shown on Figs. 1 to 4
inclusive herewith for the purposes named, and substantially as described and
shown on the drawings herewith.
Dated this 13th day of Fehmar: 1800
H. WALKER HILL,
2, Church Gate,' Nottingham, Agent for the Applicant.