Improvements in Apparatus for Automatically Stopping and Locking Hoists or Lifts.
Year: 1888

page_text: Improvements in Apparatus for Automatically Stopping and
Locking Hoists or Lifts.
I, DAVID WATERHOUSE CHADWICK, of 18, Tenter Croft, Crackenedge, Dewsbury,
in the County of York, Mechanic, do hereby declare the nature of this invention and
in what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement
:-
This invention relates to certain improvements in apparatus for automatically
stopping, and locking hoists, or lifts, whereby such machines can be worked with
greater safety than hitherto.
I accomplish my object in the following manner-
To the rod, rope, or chain communicating with the power, I secure as many metal
collars as there are floors, the said collars secured to the rod, or the like, pass through
a cylinder held by a bracket secured to the side of the cage, at right angles to the
said cylinder forming the guide, I form a cylinder, within which I place a bolt,
actuated by a spiral spring, the former when liberated, is operated upon by the spring,
and caused to engage with one of the metal collars, secured to the before-mentioned
rod, thus actuating the power in the same way as if done by hand in the ordinary way,
but with this advantage, that the collars are set to the exact positions, and the hoist.
is stopped with certainty at the exact level of the respective floors, and securely locked
in that position, and, until the bolt is forced back to its former position by the
attendant operating a hand lever attached to the side of the casting forming the
guide, the hoist cannot be removed from the floor at which it is standing.
My invention also consists in being able to set the hoist to stop at any particular
floor, that is to say, I can start from the ground floor, and set the hoist to stop at the
sixth, whereby the hoist will miss the floors intervening, and stop automatically at the
desired floor, this I accomplish by fixing to the side of the hoist well, as many pro-
jections as there are floors; the guide through which the collars secured to the rod,
chain, or rope pass, is mounted in such a manner, that it can be turned in its bearings
such a distance, as to enable a lever mounted thereto, and which passes through the
cage side, to come in contact with any of the desired projections, and is thereby
operated in such a manner as to release the bolt, and cause the same to engage with
the collar.

page_text: In order that my invention may be more fully understood, I will further describe
the same by making reference to the accompanying sheet of drawings, in which
Fig. 1. represents a section through a hoist well, showing my apparatus in position in
the cage, Fig. 2. is a plan of same, Fig. 3, is a view of my apparatus shown in section,
having the levers for operating the bolt removed, Fig. 4. is a sectional plan of same
through line .. Fig. 5. is a view of the apparatus showing the levers in position
for being operated upon by the projections, and Fig. 6. is a view showing the vertical
positions of the projections in the well wall.
To the inside of the cage A, I mount a bracket B, which is prepared to receive the
cylinder C, forming the guide for the rod, rope, or chain D, which has secured to it in
proper position, as many metal collars S as there are floors; at right angles to the said
cylinder C. I cast a cylinder of smaller diameter, which receives the bolt E, and
spiral spring K; to the bottom, or any convenient part of the before-mentioned
cylinder C, mount a hand wheel F, on the periphery of which 1 affix a number for
each floor, which acts as an index.
To the side of the hoist well, I mount as many projections G, as there are
floors, and by placing the said projections, G, in the positions illustrated by Fig. 6:
the user of the hoist by turning the land wheel, F, to any desired number of floor, he
sets the lever H, mounted on the casting and which projects through the side of
the cage A, in such a position as to cause the same when ascending or descending, to
come in contact with the projection representing the floor at which it is desired the
hoist should stop, the contact of lever H with the stop G, causes the forked end of
lever H, to operate the hand lever J, in the direction of the arrow, and so liberate the
bolt E, which is then forced by the spiral spring K, into position to engage with the
groove L in the stop collar S, thus bringing the hoist to a stand.
When it is desired to start the hoist, the holt E is withdrawn from the collar by
means of the hand lever J, and in this way to the bolt E is secured a pin M, projecting
through the cylinder C, in which a horizontal slot P, is left for the pin M
to work in on lifthing the hand lever J, the pin M, and with it the
bolt E, is forced back against the spiral spring, thus clearing the bolt from the
collar S on pulling the rope, the hoist is started the attendant then sets the number
on the hand wheel, which number represents the floor at which he desires to stop at,
to the pointer R secured to the bracket B, thus bringing the lever H into position to
engage with the requisite projection and again bring the hoist to a stand as above
described.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is
-
The hereinbefore described method of, and apparatus for, automatically stopping,
and locking hoists,
or lifts.
Dated this 201
Ր A
000
JOHN WAUGH,
Agent.