Improvements in Safety Hoist. Doors.
Year: 1888

page_text: PROVISIONAL SPECIFICATION.
Improvements in Safety Hoist. Doors.
JOHN GORDON L.A. Architect 134 Bath Street Glasgow do hereby declare the
nature of this invention to be as follows
The well of the Lift, hoist or Elevator to which the invention is applied is
provided with two series or sets of doors (an upper one above the cage &
a lower one beneath the cage) which move freely upwards & downwards in guide
posts. The doors are attached to balance weights by chains, cords bands or other
fastenings. When the lift is in motion the doors of the lower series being over-
balanced by their weights automatically ascend with the cage until they are
successively & automatically arrested at their respective places by fixed stops.
In the downward motion these doors are successively & automatically caught by the
floor of the descending cage & carried to the bottom.
The doors of the upper series are successively & automatically caught by the roof of
the ascending cage & carried to the top.
These doors also, by their own weight, descend with the cage until they are
successively and automatically arrested at their respective places by fixed stops.
Dated this Ninth day of April 1888.
JOHN GORDON, I.A.,
Architect,
134, Bath Street, Glasgow.

page_text: JOHN GORDON Architect 134 Bath Street Glasgow, 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:-
The well (a) of the lift, hoist, or elevator, to which the invention is applied is
provided with two series or sets of doors, an upper series (F) above the cage and
à lower one (C) below it. These doors move freely upwards & downwards, and are
maintained in their places by guide grooves (H). The doors are attached to balance
weights by means of chains, cords, bands, or other fastenings (I), which pass over
pullies (E) in the same manner as the cords or chains of a hung window sash.
When the lift is in motion, the doors of the lower series (C) being over balanced.
by their weights (D), automatically ascend with the cage () until they are
successively and automatically, arrested at their respective places or floors by
stops.
In the downward motion these doors are successively and automatically caught
by the floor of the descending cage (b) & carried to the bottom of the hoist well (G).
The doors of the upper series (F) in the upward motion are successively & automatically
caught by the roof of the ascending cage (b) and carried to the top of the hoist
well. These doors, in the downward motion, by their own weight descend with the
cage (6) until they are successively and automatically arrested at their places or floors
by stops.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is―
That these automatic doors are made self acting my means of weights, attached to
them by cords which pass over pullies, in the manner of a hung window sash, and the
application of the principle of the hung sash to a series of doors ou different levels
constitutes this invention.
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