IMPROVEMENTS IN DOORS AND APPARATUS CONNECTED THERE- WITH FOR ENCLOSED HOISTWAYS
Year: 1874

page_text: LETTERS PATENT to George Haseltine, of the "International Patent
Office," Southampton Buildings, London, Doctor of Laws, for the
Invention of "IMPROVEMENTS IN DOORS AND APPARATUS CONNECTED THERE-
WITH FOR ENCLOSED HOISTWAYS." -A communication from abroad by
COMPLETE SPECIFICATION filed by the said George Haseltine at the
Office of the Commissioners. of Patents, with his Petition and
Declaration, on the 14th March 1874, pursuant to the 9th Section,
of the Patent Law Amendment Act, 1852.
5: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
HASELTINE, of the "International, Patent Office, Southampton, Build-
ings, London, Doctor of Laws, send greeting..
WHEREAS I am in possession of an Invention for "IMPROVEMENTS
IN DOORS AND APPARATUS CONNECTED THEREWITH FOR ENCLOSED HOISTWAYS," and
have petitioned Her Majesty to grant unto me; my executors, adminis-
trators, and assigns, Her Royal Letters Patent for the same, and have

page_text: made solemn Declaration that it has been communicated to me from
abroad by John W. Meaker, of Detroit, Michigan, United States of
America.
NOW KNOW YE, that I, the said George Haseltine, do hereby
declare that the following Complete Specification, under my hand and
seal, fully describes and ascertains the nature of the said Invention, and
in what manner the same is to be performed, in and by the following
statement, reference being had to the accompanying Drawing forming
a part of this Specification :-
.
As is well known the entrance to the carriage or platform of enclosed 1
hoistways is generally through a single vertical sliding door operated by
hand, requiring the presence of an attendant to open it when the
carriage arrives at the floor upon which it is located. As there are
usually several floors in the buildings, some of the doors are liable to be
left open, and as a consequence the hatchways are left unguarded as well 1
as a passage way for heated air (and in case of fire) of flame from the
lower to the upper stories.
The object of this Invention is to guard the hatchways at all times
and to prevent the hoistways from becoming flues for carrying heated
air or flame from the lower to the upper stories by means of two half 2
doors of unequal weight, the lighter being suspended to and below the
heavier in the doorways opening into the hoistway, and both arranged to
slide vertically therein in opposite directions, so that when opened by
hand or automatically by the movement of the carriage they will always
close automatically when left free to move.
2

page_text: are suspended to and above each other by cords a, a, passing over
pulleys b, b, and in such manner as to cause them to move in opposite
directions, as shown in the same Figure. The upper door E is made a
little heavier than the lower one D, in order that its greater weight will
cause them to come together automatically when left free to move,
whether opened by hand or automatically by the movement of the
carriage, as herein-after explained.
The opening by hand can be effected at any time by simply raising the
upper door, and this door can be held in any desirable position by a catch
or other suitable device..
.
In order to have the doors opened and closed, automatically by the
motion of the carriage, and held open while the floor of the carriage is
on a level with the floor of the building from which the doors open into
the hoistway, a cam plate G with stopping ends and a straight inter-
mediato edge is fastened in a vertical position to the frame of the carriago
as shown in Figures 1 and 2; this cam actuates a swinging lever or arm F
pivoted to a bracket J secured to the post A or some other suitable part of
the hoistway, and which in turn, by means of a connecting cord C. passing
over the pulleys d and e operates the doors as shown in the same Figures.
The lever F is provided at its lower end with a pin, on which is placed a
friction roller g for the cam G to bear against, as shewn in Figure 4.
When the doors are closed and the devices in the position shown in
Figure 1, it will be seen that as the carriage goes up the lower end of
the lever will be swung forward and its upper end backward, and the
doors opened as shown in Figure 2, at which time the floor of the carriage
will be on the same level with the floor of the building.
It will be further seen that the doors will remain open while the lower
end of the lever is upon the cam between its sloping ends, but that as
soon as the movement of the carriage either up or down allows the end of
the lever to pass down either of the sloping ends of the cam, that the
doors will close.
During the movement of the carriage all of the doors opening into the
hoistway are closed, except the one at which it happens to be. When
the carriage is at the bottom of the hoistway or at a point intermediate
between the floors of the building, the hoistway is entirely closed. Thus
by the use of these devices nearly all opportunity for the passage of air
currents from a lower to an upper story is cut off, but it may be

page_text: rendered still more effectual if desired by covering the top of the hoist- .
way.. In this way a cheap and simple door for enclosed hoistways is
provided, serving both as a hatchway guard and a closet to be operated
automatically by the approaching carriage or by hand at all times..
Having thus fully described the said Invention as communicated to 5
me by my foreign correspondent, and the manner of performing the
same, I wish it understood that I claim,-
First. A door for enclosed hoistways consisting of two parts of
different weights, the lighter being suspended to and under the heavier,
and both arranged to operate substantially as herein described.
Second. The combination of, the cam G, lever F, and cord. C, or its
equivalent with the doors D and E, when constructed and arranged to
operate substantially as and for the purpose set forth.
10
In witness whereof, I,.. the said George Haseltine, have here……..
unto set my hand and seal, this Fourteenth day of March, in 18
the year of our Lord One thousand eight hundred and seventy-.
four..
GEORGE HASELTINE. (L:s.)
Witness, ..
JAMES EDWARDS,
8, Southampton Buildings, :
London.