An Improved Device for Automatically Opening and Closing the Well Doors of Lifts
Year: 1895

page_text: Date of Application 6th May 1895-Accepted, 7th Sept, 1895
COMPLETE SPFCIFICATION
An Improved Device for Automatically Opening and Closing the
Well Doors of Lifts
I, JOHN HENRY WRIGHT, of King William Street Adelaide, in the Province
of South Australia, Carpenter, 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
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The object of my invention 13 to provide a contrivance actuated by the cage
itself which will automatically close the door as the cage rises from the ground
floor and open it as the cage returns to that position I also provide a means for
closing the intermediate well doors, that is to say the doors on the floors or flats
above the ground floor
I accomplish the purpose of my invention by arranging a groove on channel
formed by fixing two bars diagonally across the inside of the door at such angle as
may be de irable according to the speed of the lift I provide the floor or top of
the cage as the case may be with a projecting pin or roller which enters the
groove or channel and by engaging one or other of the bars causes the door to
slide forwards or backwards in its frame as the cage rises from or descends to the
ground floor
In order that the door may not open from the outside when the cage is raised in
the well, I provide an internal catch and so arrange that by means of a projecting
pin this catch is automatically released on the descent of the cage
In order that my invention may be the better understood, I will now proceed to
describe the same by reference to the accompanying drawings, in which
Fig 1 is a front elevation of the door and frame shewing the channel complete
Fig 2 side elevation of the same
Fig 3 front elevation of an intermediate door
Fig 4 plan partly in section of door and framing and floor of the cage, the
door being shewn open
Fig plan of the same, the door being shewn closed
Similar letters of reference indicate coresponding parts in all figures
To a door of ordinary construction A sliding freely backwards and forwards in
a frame B, forming part of the front of the well in which the cage works, I fix
diagonally across the lower portion of the inner side two projecting bars or plates
forming an open chanr el C The lower and upper ends C₁ of this channel C
are widened and the ends of the bars bent outwards in order to afford greater
facility for the entrance of the actuating pin In order to actuate the door,
I affix a projecting pin or roller E of such convenient size as will readily engage
the bars or plates and pass freely through the channel C, similarly to the framing
of the floor or roof of the cage D as the case may be for actuating the ground floor
or top floor door, but propose describing my invention for convenience
particularly with regard to the ground floor door By reference to Fig 4 it will
be seen that the cage is shewn on the ground floor with the door A open and the
projecting pin or ioller E in the entrance of the channel C formed by the
projectin bars or plates As the cage ses the pin or roller E travels along
the channel C, and pressing against the inner bar takes the door with it
length of the bars is so arranged that as the pin or roller Eise from the
opening C¹ the door has been carried across the opening and closed as shewn
Fig 5
more
The

page_text: In order that it may not be opened until the cage returns again to the ground
floor, I provide an internal catch F fixed to the door and engaging a pin F¹ on
the door frame, but do not claim this as part of my invention
On the cage
descending to the ground floor this catch is released by a projecting pin provided
for the purpose simultaneously with the entrance of the projecting pin or rollet E
into the upper end C of the channel C formed by the two projecting bars or
plates
As the cage D descends the pin or roller E trave's downwards along the
channel C and by pressing against the outer bar opens the door so that on the
cage reaching the floor the door stands wide open
If it is desired that the door shall be closed only, I provide only a single bar or
plate, fixed diagonally across the lower portion of the door and allow the opening
to be effected by the lift attendant
If
In order to close the intermediate well doors I provide such doors with a bar
or plate G as shewn in Fig 3 If the door is closed the projecting pin or roller E
will pass without engagement, and the door can be opened by the attendant
on the contrary the door is open the projecting pin or toller E will then either on
the cage rising or descending engage the bar or plate G, and close the door
The speed at which the door can be closed can be regulated by alteration of the
angle at which the bar G or bars forming the channel C is placed diagonally
across the door According as this angle is greater or less so will the door move
a less or greater distance for given movement of the cage
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
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First The herein described device for opening and closing the well doors of
lifts consisting of two projecting bars or plates forming an open channel fixed
diagonally across the door and actuated by a projecting pin or roller (such as E)
fixed to and projecting from the floor or roof of the cage, substantially as heiein
described
Second The herein described device for closing the intermediate well doors of
lifts, consisting of a projecting bar or plate (such as G) arranged diagonally across
each door and actuated by a projecting pin or roller (such as L) fixed to and
projecting from the floor or roof of the cage, substantially as herein described and
shewn in Fig 3
Third A device for closing the well doors of lifts consisting of a bar or plate
fixed diagonally across the lower portion of the door and actuated by a projecting
pin or roller fixed to and projecting from the floor or 100f of the cage, substantially
as herein described
Dated this 6th day of May 1895
BOULT & WADE,
Agents for the Applicant