IMPROVED MEANS FOR THE PREVENTION OF ACCIDENTS IN HOISTS to be as follows:
Year: 1884

page_text: I WILLIAM DEAN of Undercliffe, Bradford, in the county of Yorks, Mechanic do
hereby declare the nature of the said Invention for "IMPROVED MEANS FOR THE
PREVENTION OF ACCIDENTS IN HOISTS to be as follows:-
"3
My invention relates to improved means whereby the barrier or doors guarding
the approach or passage to the cage or hoist are raised or lowered and the passage
to the cage or hoist opened or closed by the action of the cage or hoist itself as it
approaches or leaves the floor.
At the side of the hoist, in the masonry or framing of the said hoist, I provide
suitable bearings in which is mounted a shaft carrying a toothed wheel having an
elongated boss, the said wheel being secured to the said shaft by a set-screw passing
through the said boss, or by other suitable means. Over the said wheel, upon a
suitable stud I mount another toothed wheel, the said wheel turning freely upon
the said stud and the two wheels gearing together. The wheel mounted upon the
stud has also an elongated boss and I provide the bosses of both wheels with a rod,
spur or other suitable projection on that side of the said bosses which is next to
the cage or hoist.
H
On the outer end of the before-mentioned shaft is mounted the bar or barrier
for closing the passage to the cage or hoist, or when doors are used to close the
passage a crank is mounted on the said shaft. The said crank is connected by
rope or chain with a wheel mounted above it. The said wheel carries an arm or
lever from the extremity of which a rope or chain passes to the top of the door
closing the passage to the cage or hoist, the said rope or chain passing over a pulley
arranged over the said door. The door is preferably made in two portions, to suit
the height of the floors, the said portions sliding in grooves in the framing of the
hoist and so arranged that the lower half, which is first actuated, raises the upper
half by coming in contact with a ledge or projection thereon.
On that side of the cage or hoist which is next to the shaft I mount a tappet-
plate. As the said cage or hoist rises to the level of the floor the upper end of the
tappet-plate strikes against the rod or spur on the boss of the wheel mounted on
the shaft, raising the said rod or spur and thus causing a partial revolution of the
said shaft whereby the bar or barrier protecting the passage to the cage or hoist is
raised and the passage opened. Or, if doors are used to close the passage the
crank is operated by the motion of the shaft, the wheel carrying the arm or lever

page_text: is partially rotated drawing the said lever over to about a horizontal position and
thus the door is raised.
As the cage or hoist rises above the level of the floor the rod or spur on the shaft
wheel which has been raised is released from the tappet-plate and the doors or bar
fall by their own gravity.
When the cage or hoist is descending the tappet-plate strikes the rod or spur on
the stud wheel. The said stud wheel rotates the other wheel and shaft and thus
raises the barrier or doors in the manner previously described.
As soon as the
cage or hoist has descended below the level of the floor the rod or spur on the stud
wheel is released from the tappet-plate and the doors or bar full by gravity.
The details herein described may be modified without departing from my inven-
tion and any other kind of doors than those above mentioned may be operated by
my improved apparatus.
T. N. PALMER & Co.,
For the Applicant.

page_text: I, WILLIAM DEAN of 71 Charnwood Road Undercliffe, Bradford, in the County
of Yorks, Mechanic do hereby declare the nature of my said invention for
"IMPROVED MEANS FOR THE PREVENTION OF ACCIDENTS IN HOISTS
"" 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 accompanying drawing
forming a part of this specification :-
:-
My invention relates to improved means whereby the barrier or doors guarding
the approach or passage to the cage or hoist are raised or lowered and the passage
to the cage or hoist opened or closed by the action of the cage or hoist itself as it
approaches or leaves the floor.
At the side of the boist in the masonry or framing of the said hoist I provide
suitable bearings in which is mounted a shaft carrying a toothed wheel having an
elongated boss, the said wheel being secured to the said shaft by a set-screw passing
through the said boss or by other suitable means Over the said wheel, upon a
suitable stud, I mount another toothed wheel, the said wheel turning freely upon
the said stud and the two wheels gearing together. The wheel mounted upon the
stud has also an elongated boss and I provide the bosses of both wheels with a rod,
spur or other suitable projection on that side of the said bosses which is next to the
cage or hoist.
On the outer end of the before-mentioned shaft is mounted the bar or barrier for
closing the passage to the cage or hoist, or when doors are used to close the passage
a crank is mounted on the said shaft. The said crank is connected by a rope or
chain with a wheel mounted above it. The said wheel carries an arm or lever from
the extremity of which a rope or chain passes to the top of the door closing the
passage to the cage or hoist, the said rope or chain passing over a pulley arranged
over the said door. The door is preferably made in two portions, to suit the height
of the floors, the said portions sliding in grooves in the framing of the hoist and
so arranged that the lower half, which is first actuated, raises the upper half by
coming in contact with a ledge or projection thereon.
On that side of the cage or hoist which is next to the shaft I mount a tappet-
plate. As the said cage or hoist rises to the level of the floor the upper end of
the tappet-plate strikes against the spur or rod on the boss of the wheel mounted
on the shaft, raising the said rod or spur and thus causing a partial revolution of
the said shaft whereby the bar or barrier protecting the passage to the cage or
hoist is raised and the passage opened. Or if doors are used to close the passage
the crank is operated by the motion of the shaft, the wheel carrying the arm or
lever is partially rotated drawing the said lever over to about a horizontal position
and thus raising the door.
As the cage or hoist rises above the level of the floor, the rod or spur on the shaft
wheel which has been raised is released from the tappet-plate and the doors or bar
fall by their own gravity.
When the cage or hoist is descending the tappet-plate strikes the rod or spur on
the stud wheel. The said stud wheel rotates the other wheel and shaft and thus

page_text: raises the barrier or doors in the manner previously described.
As soon as the cage
or hoist has descended below the level of the floor the rod or spur on the stud
wheel is released from the tappet-plate and the doors or bar fall by gravity.
DESCRIPTION OF THE DRAWING.
Figure 1 is a front elevation of a portion of a hoist showing my improvements.
Figure 2 is a side elevation of the same.
Like letters indicate like parts in both figures.
A is the cage or hoist and B is the framing within which the said cage or hoist
travels. A is the bar to which the lifting chain or rope is secured. At the side
of the hoist in the masonry or framing of the said hoist brackets or other suitable
bearings C are provided in which is mounted a shaft D. Upon the said shaft is
mounted a toothed wheel E having an elongated boss E extending towards the
front of the hoist the said wheel being secured on the said shaft by a set-screw or
'by other suitable means. Over the said wheel upon a suitable stud F secured in
the bracket C is mounted another toothed wheel Ġ also having an elongated boss G¹
extending backward, the said wheel turning freely on the stud F and gearing into
the wheel E. The bosses E¹ and G³ are each provided with a rod, spur or other
suitable projection E" and G.
On the outer end of the shaft D is mounted the bar or barrier H for guarding
the passage to the cage or hoist. The said bar is so mounted on the shaft that
when the said shaft is at rest the bar is down and the entrance to the cage or hoist
is closed. When doors are used to close the passage to the cage or hoist a crank I is
mounted on the outer end of the shaft D' instead of the bar H. The crank I is
connected by a chain or rope J with a wheel K mounted over the said crank the
end of the rope or chain J being secured in the groove of the wheel K as shown
at k so as to permit of the requisite revolution of the said wheel To the wheel K
is secured an arm or lever L from which a rope or chain M passes over a pulley N
and is secured at its other end to the door O. The door for closing the passage to
the cage or hoist may be in one, two or more portions. In the drawing I have
shown the door in two portions O and O¹ sliding in grooves in the framing of the
hoist. The lower half Ŏ is first actuated and as the said half rises it comes in
contact with the ledge or projection 01 on the upper half O¹ of the door and thus
carries the said upper half with it in its ascent.
On the side of the cage or hoist next to the shaft D a tappet-plate P is mounted.
The upper and lower edges P¹ P¹¹ of the said plate strike the rods or spurs Ell
and G respectively as the cage or hoist A is ascending or descending. The tappet-
plate is bevelled as shown at P1 and P to prevent the rods or spurs G₁ and Ell
from catching the edges of the said plate. As the cage or hoist A rises to the level
of the floor (indicated at Q) the upper edge P¹ of the tappet-plate strikes the rod
or spur E of the wheel E raising the said spur and depressing the spur G₁ thus
causing a partial revolution of the shaft D raising the bar H and opening the
passage to the cage or hoist A. If doors are used to close the passage the crank I
is partially revolved as shown in figure 2 causing a partial revolution of the
wheel K, the arm or lever L is brought to about a horizontal position and the pull
thus exercised on the rope or chain M. draws up the doors 0, 01 and opens the
passage to the cage or hoist. As the cage or hoist rises above the level of the floor
the rod or spur E", which has been raised, as shown in figure 2, is released from
the bevelled edge pin of the tappet-plate and the doors O, O¹ or bar H fall by
gravity causing the crank I, shaft D and wheels E and G to return to their original
position.
As the cage or hoist descends to the level of the floor the edge P₁ of the tappet-
plate strikes the rod or spur G₁ and depresses it. The wheel G thus imparts a
partial revolution to the wheel E and shaft D, and the rod or spur E" is raised.
The partial revolution of the shaft D raises the bar H or doors 0 0¹ in the manner
previously described. On the cage or hoist A descending below the level of the

page_text: floor the rod or spur G₁ is released from the bevelled edge P111 of the tappet-plate
and the doors or bar fall by gravity.
In figure 1 I have shown the cage or hoist below the level of the floor the
doors OO and barrier H down and the entrance to the cage or hoist closed. In
figure 2 I bave shown the cage or hoist on a level with the floor the doors O, O'
and barrier H raised and the entrance to the cage or hoist open.
I do not confine myself to the exact arrangement of details herein described as
the said details may be varied without departing from my invention. Any
suitable connections between the crank and door or doors may be employed which
will ensure the proper actuation of the said door or doors by the said crank and
any other kind of doors for closing the passage to the cage or hoist may, by slight
modification, be operated by my improved apparatus.
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
First. The combination of the shaft D and wheels E and G carrying rods or
spurs E" G" with the tappet-plate P constructed and arranged substantially as and
for the purpose set forth.
Second. The combination of the shaft D, wheels E and G carrying rods or
spurs E G and tappet-plate P with the bar H substantially as and for the
purpose set forth.
Third. The combination of the shaft D wheels E and G carrying rods or
spurs E G crank I and tappet-plate P constructed and arranged substantially as
and for the purpose set forth.
Fourth. The combination of the shaft D wheels E and G carrying rods or
spurs EG", crank I tappet-plate P doors O, O¹ or their equivalent, wheel K and
lever L and connections, constructed and arranged substantially as and for the
purpose set forth.
Fifth. The combination of the shaft D wheels E and G carrying rods or
spurs E" G", crank I, tappet-plate P and doors O, O' or their equivalent, with
suitable connections for actuating the said doors by means of the said crank.
Dated this 18th day of August A D 1885
T, N. PALMER & Co.,
For the Applicant.