Improvements in Dumb-waiters.
Year: 1887

page_text: Date of Application, 17th June, 1887.
Specification Accepted, 29th July, 1887.
COMPLETE SPECIFICATION.
Improvements in Dumb-waiters.
We, GEORGE W. CANNON, of 90 Academy Street, and EDWARD STORM, of
437 Main Street, both in the city of Poughkeepsie and state of New York, United
States of America, Carpenter and Manufacturer respectively, do hereby declare the
nature of our invention for "IMPROVEMENTS IN DUMB-WAITERS," and in what
manner the same is to be performed, to be particularly described and ascertained in
and by the following statement:-
Our invention relates to improvements in dumb-waiters, and it consists of a
combination and an arrangement of pulleys, rope, and dumb-waiter car and counter-
poise-weight, together with a cam brake, so adjusted as to dispense entirely with the
usual hoist-wheel and axle, and to require only three sizes of pulleys and one
continuous rope for operating the same. We can put upon the car another rope,
connecting it with the counterpoise-weight, using it simply as a safety appliance; or
it may be dispensed with, at the option of the parties. The novelty of our invention
consists in the simplicity of construction, ease of operation, and its ability to hold a
heavy load on the car at any desired point. By the use of one continuous rope its
slack is always taken up, and the ease of operation enhanced. Our pulleys may all be
made of the same size; but for ease of operation we prefer to place upon the upper
shelf three sizes, in order to lessen the friction and carry the ropes to their respective
positions with the least possible friction.
We attain the objects of our invention by the device illustrated in the accompanying
drawings, in which-
Figure 1 is a plan view of our dumb-waiter. Figure 2 is a sectional view, looking
down upon the same, showing the counterpoise-well at one corner thereof. This well
may be placed in any position with reference to the car-well, which convenience of
construction may dictate, and the pulleys on the shelf may be changed accordingly.
Figure 3 represents a clamp brake, adjusted so as to grip the main rope.

page_text: Similar letters refer to similar parts throughout the views. In the drawings,
A represents the large pulley-wheel, which takes the rope from the front corner of the
car-well, and carries it at any angle desired to a point vertically over one side of the
pulley or pulleys on the top of the waiter-car.
B represents a pulley, which takes the rope at the other front corner of the car-
well and carries it in any desired direction to the pulley located over the counter-
poise-well.
Crepresents the pulley that conducts the rope perpendicularly downward into the
weight-well, to and around the movable pulley E.
E represents the movable pulley which sustains the counterpoise-weight, and to the
top of which the safety-rope L, when used, may be attached.
Frepresents the pulley attached to the top of the car, near the middle point thereof;
or in the case of large dumb-waiters two pulleys of this description may be placed on
top of the car, and the hoist rope passed under both of them.
G represents the car of the dumb-waiter.
Hrepresents the continuous working-rope, one end of which is attached to the
bottom of the upper shelf K, at I, [or preferably it may be run through the shelf K
and knotted on the top] and passes vertically down under the pulley F and over the
pulley A, and down the front side of the car-well under the pulleys O, O, and up
the other front edge of the car-well over the pulleys B and C, and down under
the movable pulley E and up to the bottom of the shelf K at the point J, [or through
the shelf], where this end of the rope is fastened.
K represents the upper shelf above the car and counterpoise-well.
L represents the safety-rope, attached at one end near the pulley F to the car, and
at the other end, after passing over the pulley D, it is made fast to the movable
pulley E, at N.
M represents the counterpoise-weight.
P represents the cam safety-brake, so adjusted as to grab the rope H firmly at any
point and hold a heavy load on the car, when the brake is brought into place by the
cord R. To release the rope, it is only necessary to move it upward by pulling down
on the opposite rope, when the cam brake P drops back by the weight of its upper,
heavier end, and allows the rope H to run free.
It may be seen by the construction of my device that the counterpoise- or weight-
well may be located on either of the three sides of the car-well, as convenience of
construction may dictate, and this well may be enclosed in such manner that the
block E will not revolve by any untwisting of the rope. The holes through the
shelves above and below the car-well, through which the ropes work, are provided
with iron thimbles.
Having now particularly described and ascertained the nature of our said Invention,
and in what manner the same is to be performed, we declare that what we claim is :
1. The combination of a dumb-waiter car having connected thereto a counter-
balance-weight, M, with the pulleys, A, B, C, F, and pulley-block, E, arranged, as
shown, upon and beneath the shelf, K, and the operating-rope, H, secured to the
shelf at I, and passing under the pulley, F, over the pulley, A, and under the
pulleys, 0, 0, and over the pulleys, B and C, and under the movable block, E, and
secured to the shelf, K at J, as shown and described.
2. The combination of a dumb-waiter car, having connected therewith a counter-
balance-weight, M, the pulleys, A, B, C, F, and pulley-block, E, arranged, as shown,
upon and beneath the shelf, K, the operating-rope, H, secured to the shelf at I, and
passing under the pulley, F, over the pulley, A, and under the pulleys, O, O, and over
the pulleys, B, and C, and under the movable block, E, and secured to the shelf, K, at J,
the safety-rope, L, and the pulley, D. substantially as shown and described.
3. In a dumb-waiter, the combination of a car, G, with a counterbalance-weight, M;
the pulleys, A, B, C, F, and pulley-block, E, arranged, as shown, upon and beneath
the shelf, K; the continuous operating-rope, H, secured to the shelf at both ends and
passing over and under the pulleys and block, in the manner indicated; and the

page_text: clamp-brake, P, operated by the cord, R, for holding the rope, H, all as shown and
described.
4. In a dumb-waiter, the combination of a car, G, with a counterbalance-weight, M;
the pulleys, A, B, C, F, and pulley-block, E, arranged, as shown, upon and beneath
the shelf, K; the continuous operating-rope, H, secured to the shelf at both ends and
passing over and under the pulleys and block in the manner indicated; the clamp-
brake, P, operated by the cord, R, for holding the rope, H; and the safety-rope, L,
and the pulley, D, all as, and for the purposes, described.
1000
Patel Cus
7th day of June 1887.
1005
GEORGE W. CANNON.
EDWARD STORM.
Haseltine, Lake & Co.,
45, Southampton Buildings, London,
Agents for the Applicants.