Improvements in Doors for Elevator Shafts and Devices for Operating the same.
Year: 1890

page_text: Date of Application, 5th Aug., 1890-Accepted, 6th Sept., 1890
COMPLETE SPECIFICATION.
Improvements in Doors for Elevator Shafts and Devices for
Operating the same.
I, WILLIAM ELLIS MARLETT of La Salle, in the County of La Salle' and State of
Illinois, United States of America, Inventor, 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 :-
My invention relates to certain new and useful improvements in doors for elevator
shafts and to means for operating the same and the nature of the said invention will
be understood from the following description when taken in connection with the'
accompanying drawings in which :-
Fig. 1 is a view in perspective of the operative parts of the invention, the outlines
of one floor being shown.
Fig. 2 a view in elevation, the doors-in this view being thrown open; and'
Fig. 3 a view in detail of a rack secured to the cage or carriage.
In these drawings, A represents one floor of a building and B, B, boxes or casings
situated upon opposite sides of an elevator shaft or hatchway, such boxes or casings
preferably extending from the bottom to the top of the shaft. At points equi-distant
from one floor of the building and above and below the same, one casing, B' is
provided with slots a, through each of which the teeth of cog' b, protrude, such cögs
being suitably mounted upon short shafts c, having bearings in the casing.
One face of each cog b, is formed with a pinion d, each of which meshes' with'a'
bevelled pinion e, pinions e, being mounted upon a vertical shaft C, one at the upper
and the other at the lower end thereof.
Shaft C has bearings at both ends in boxes D, as clearly shown'and at a point ai or
about its centre is formed with a screw E, each screw extending a suitable distance'
above and below the floor line.
The casing B is provided with two slots F1 formed' through diametrically opposite
faces of such casing these slots being formed directly opposite that portion of the
shaft which is formed into the screw E.
F, F, represent the two doors which are preferably cut away on their inner edges
as shown, to form a close joint with the casings B: The size of these doors when
considered together is equal to the inner diameter of the shaft.
These doors are pivoted at both ends in brackets G secured to the opposite sides of
the casings and one end of each door is provided with a quadrant shaped frame H,
provided each on its arc shaped face with a series of teeth or cogs g, the parts being
so arranged that the arc shaped faces of frames H and the teeth g mounted thereon
will pass into the interior of the casings, the teeth engaging the screw E and adapted
to be operated thereby.
I Fig. 3 represents the cage or carriage which is provided on both sides with
racks h, preferably of the form shown, such racks being secured to or formed upon
the outer face of the cage and arranged to engage and operate the cogs b.
The operation of the device is as follows:-
The cage or carriage being at the bottom of the shaft the normal position of the
door at each landing will be such that they will be closed thus completely covering
the shaft at each story. The cage being started on its upward course, at a suitable
time before its top reaches the line of the first floor, the rack h upon one side will
engage the cog situated beneath such floor and cause the revolution thereof. Through
this medium motion will be imparted to the pinions described and through them to
the shaft and screw formed therewith.
The revolution of the screw will serve, through the medium of the teeth or cogs
named, to revolve the quadrant shape frames secured to the gates, the gates or doors

page_text: being thus caused to move in the arc of a circle until they occupy the vertical
position shown in Fig. 2. As they reach that position the top of the cage passes
them and the first landing is reached.
The continued ascent of the cage will bring the same rack into mesh with the cog
upon the upper end of this particular shaft and through the medium of a line of
gearing similar in construction and arrangement and mode of operation cause the
closing of the doors, the second cog being so situated with respect to the line of the
floor as to cause the complete closing of the doors immediately after the cage has
ascended above the line of the floor.
This operation is repeated as each story is reached, the operative mechanism being
arranged alternately upon opposite sides of the shaft.
"
The descent of the elevator cage will cause the same manipulation of the gaies.
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
claim is
1. The combination with doors for elevator shafts, such doors provided with cogs,
of an elevator cage provided with racks and gearing intermediate the doors and cage
whereby the former are operated by the latter, as set forth.
2. The combination with doors for elevator shafts such doors provided with cogs
arranged in the are of a circle, of an elevator cage provided with racks and gearing
intermediate the doors and cage whereby the former are operated by the latter, as set
forth.
3. The combination with doors for elevator shafts carrying quadrant shaped frames
provided with cogs, of a shaft formed with a screw, an elevator cage provided with a
rack and gearing intermediate the cage and shaft whereby the latter is operated by
the former as set forth.
4. The combination with a shaft formed with a screw, pinions mounted upon the
ends of the shaft, pinions meshing therewith and cogs, of a cage provided with a rack
to engage the cogs and doors carrying quadrant shaped frame provided with cogs to
engage the screw, as set forth.
Dated this 5th day of August 1890