Improvements in and relating to Self-acting Doors or Gates of Lifts, Hoists, and like Mechanical Elevators.
Year: 1890

page_text: Date of Application, 7th Mar., 1890
Complete Specification Left, 8th Dec., 1890-Accepted, 24th Jan., 1891'
PROVISIONAL SPECIFICATION.
Improvements in and relating to Self-acting Doors or Gates of Lifts,
Hoists, and like Mechanical Elevators.
I, FREDERICK HOLGATE, of 20, Whitham Street, Burnley, in the County of
Lancaster, Millwright, do hereby declare the nature of this invention to be as
ollows:
This invention is designed for automatically opening and closing the doors or gates
leading to the hoist shaft, for the prevention of accidents.
The door or gate of each landing or stage of the hoist is arranged to slide in
vertical grooves formed in or on the uprignts, and connected to balance weights in a
similar manner to those of an ordinary window sash, so that the doors or gates will
rise and fall in opposite directions to their respective balance weights.
Near the top and bottom of the hoist-box or cage are placed slide-pieces, which
move horizontally in guides, and are pushed forward by spring or weighted levers.
These slide-pieces are so arranged as to be capable of acting in conjunction with
suitable projections fixed to the lower part of each door or gate, and with projections
fixed to the lower extremities of their respective balance weights as a means of
actuating and controlling independently the movement of the door or gate of each
landing, whilst the hoist box or cage is ascending or descending the shaft from story
to story.
During the ascending movement of the hoist box or cage, the upper slide pieces
raise the gate of each story, by the projections on the gates or doors, whilst the lower
slide pieces act upon the projections branching from the balance weights to control
the speed of descent to that of the speed of ascent of the balance weights, and in
unison with the speed of traverse of the ascending cage.
With the descending movement of the hoist box or cage, this order of raising
and lowering the gates or doors of hoists is reversed, that is to say that the doors
or gates, as the cage passes downwards from one story to another, are raised by
the lower slide pieces acting first upon the projections branching from the balance
weights, whilst the descent of the doors or gates is controlled by the upper slide-
pieces acting under the projections branching from the doors or gates.
The upper and lower slide-pieces are withdrawn or thrust from the projections at
the proper time by graduated swells fixed to the uprights; and to avoid nicety of
adjustment to thrust back the upper slide-pieces on the descent of the cage, the
door or gate projections are bevelled or inclined backwards, that the said slides may
force themselves past the door projections without injury to the slides. The pro-
jections on the balance weights are bevelled on the underside to allow the lower slides .
in ascending the shaft, to pass the balance weights, in a similar manner to those of.
the upper slides.
Dated this 6th day of March 1890
COMPLETE SPECIFICATION.
Improvements in and relating to Self-acting Doors or Gates of Lifts,
Hoists, and like Mechanical Elevators.
I, FREDERICK HOLGATE, of 20, Whitham Street, Burnley, in the County of
Lancaster, Millwright, 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:—
This invention is designed for automatically opening and closing the doors or gates
دوم

page_text: leading to the hoist shaft for the prevention of accidents; and consists of a novel
arrangement of slide pieces, which act upon projections branching from the doors
and balance weights, from which at the proper time the slide pieces are liberated by
curved or inclined surface plates fixed stationary to the uprights of the hoist.
Fig. 1 is an elevation in section of a hoist, taken through the centre of the cage.
in which view is represented the various parts constituting the essential features of
this invention.
Fig. 2 represents a pair of scroll speed pulleys, as and for the purpose hereinafter
described.
Fig. 3 is an elevated view in section shewing the interior of the upper casing
and a spira! spring to push out the slide-piece, which acts at the upper part of the
cage.
Fig. 4 is a plan of the casing and slide-piece detached from the cage.
Figs. 5 and 6 are similar views representing the lower casing and the slide-piece.
A represents an upright of the hoist; B the cage. to which are fixed the casings C
and 1, in which the slide pieces C and D₁ move horizontally. The slide piece C
lifts the gate E by the projection E', fixed to its lower extremity, when the cage is
ascending to a landing, and carries with it the gate E to the position seen in Fig. 1,
When the cage passes
so that goods may be received or discharged from the cage B.
from the landing, during its further ascending movement, the slide piece is then
thrust from the projection E' by the curved or inclined surface plate F; whilst the
lower slide piece D' slides down the fixed incline G, and engages with the pro-
jection H of the balance weight H, which then follows the slide piece D¹ upwards, so
as to govern the speed of the descent of the gate, which is slightly heavier than the
balance weight.
When the cage descends the shaft, the slide piece D¹ will then bear upon the pro-
jection H of the balance weight H, depressing it and causing the gate E to rise from
the passage.
The slide pieces C and D are so arranged as to act independently of each other
upon their respective inclines and projections.
In substitution of the ordinary guide pulley and suspension cord of the gate and
balance weight, I employ the scroll speed pulleys J and K, upon which the cords J¹
and K, attached respectively to the gate and balance weight, are alternately wound
and unwound.
A variable motion is thus obtained in the descent of the gate E, which is slower at
the commencement than at the termination of its descent to allow more time for the
discharge of goods from 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
1. The arrangement of parts comprising slide-pieces C₁ and D¹ operating upon
projections E and H₁ for raising and lowering the gate; and the stationary inclines
or curved plates F and G for the liberation of the slide-pieces, substantially as
described.
1
1000
THOS. RICHMOND,
Agent.