Improvements in Double Doors and Closing Apparatus therefor.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Double Doors and Closing Apparatus therefor.
We, ALEXANDER HILL TELFER, Piano Tuner, and DAVID RICHARDSON, Hotel-
keeper, both of Gore, Otago, in the Colony of New Zealand, do hereby declare
the nature of this invention to be as follows:-
This invention relates to double or as they are sometimes called folding or swing
doors such doors being without a latch to fasten the same, and its object is to
provide means whereby the doors will close automatically and may be readily
and easily opened by a pedestrian and at the same time resist the pressure of the
wind so that they will not open when under the influence of a current of air.
The invention consists of a pair of doors meeting in the centre of the doorway
in the ordinary manner and pivoted at the sides upon suitable pintles one of which
on each door projects through the frame preferably above the door. Cranks are
fitted upon such extended pintles at about a right angle to the plane of the doors
and these cranks are connected together by a connecting rod. Springs are attached
to the connecting rod or cranks so that whichever way the connecting rod and
cranks are moved when opening the doors one of the springs will be operated and
tend to close the doors.
It results therefore that when one door is pushed or pulled the other will be
made to advance or recede by the mediation of the cranks and connecting rod
thus making ingress and egress through the doors easy and ample, but that when
pressure is brought to bear on both doors and on the same side, as in the case
with a current of air the tendency of the pressure to open one door is nullified by
the pressure upon the other door.
A stop is provided to prevent the doors from being opened too widely.
In a modification pinions are fixed upon the spindle and geared together by a
rack, or sprocket wheels and a chain may be used for this purpose.
Dated this 11th dow of June 1897
BREWER & SON,
London and Leeds, Agents for the Applicants.
Improvements in Double Doors and Closing Apparatus therefor.
We, ALEXANDER HILL TELFER, Piano Tuner, and DAVID RICHARDSON, Hotel-
keeper, both of Gore, Otago, in the Colony of New Zealand, 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 relates to double or as they are sometimes called folding or swing
.
ונס....מ

page_text: doors such doors being without a latch to fasten the same, and its object is to
provide means whereby the doors will close automatically and may be readily
and easily opened by a pedestrian and at the same time resist the pressure of
wind so that they will not open when subjected to the pressure of a current of air.
The invention consists of a pair of doors meeting in the centre of the doorway
in the ordinary manner and pivoted at the sides upon suitable pintles one of which
on each door projects through the frame preferably above the door. Cranks are
fitted upon such extended pintles at about a right angle to the plane of the doors
and these cranks are connected together by a connecting rod. Springs are attached
to the connecting rod or cranks so that whichever way the connecting rod and
cranks are moved when opening the doors one of the springs will be brought into
operation and tend to close the doors.
It results therefore that when one door is pushed or pulled the other will be
made to advance or recede by the mediation of the cranks and connecting rod
thus making ingress and egress through the doors easy and ample, but that when
pressure is brought to bear on both doors and on the same side, as in the case
with a current of air the tendency of the pressure to open one door is neutralised
by the pressure upon the other door.
In order that our invention may be most easily understood reference will be
made to the accompanying drawing whilst a description in detail is given.
Figure 1 is an elevation of the doors and frame with part of the fascia board
removed, the doors being closed.
Figure 2 is an elevation of the same, with the doors open.
Figure 3 is a plan of the same with the duors closed.
Figure 4 is a plan of the same with the doors open.
Similar letters refer to corresponding parts.
Upon the drawings, the doors (a) are hung within the frame (b) upon their
pintles (6¹ & b³) in the ordinary manner. The upper pintles (61), however, are
fengthened to receive the cranks (e) which are rigidly secured to the pintles, and
these said cranks are connected together by the connecting rod (d) so that when
one crank is moved the other will move to the same extent. In normal conditions,
that is when the doors are closed, the cranks are held in the position shewn on
Figure 3 by the tension of springs (f & g) which are hooked to studs (f¹ & g²)
secured to the frame (b), and to studs (f & g) secured to the connecting rod (d)
but when the doors are opened in the direction shewn on Figure 4 the tension on
spring (f) is increased and that on spring (g) is released so that immediately the
doors are released they will be closed by spring (f). When the doors are opened
in a contrary direction spring (g) will be brought into tension and operate as
just described in the case of spring (g).
By reference to Figure 3 it will be seen that if a pressure of air is exerted
upon the doors in the direction shewu by the arrows, the connecting rod will be
brought into compression by means of the cranks, and if the pressure of air is
upon the other side of the door then the rod will be in tension. In either case the
cranks will be prevented from moving and the doors thus held closed.
It is obvious that mechanical equivalents of the cranks (c) may be used, such
as pinions and a rack, or sprocket wheels and a chain.
Having now particularly described and ascertained the nature of our said in-
vention and in what manner the same is to be performed, we declare that what
we claim is:-
-
1. In combination with folding doors having pintles extending through the
door frame of cranks secured to the pintles and connected together by a rod
provided with springs substantially as and for the purposes set forth herein.
2. Folding doors arranged so that they will swing freely in opposite directions
and having cranks, connecting rod, and spring whereby they will be prevented

page_text: from opening when subjected to a current of air, substantially as and for the
purposes set forth herein.
3. Folding doors provided with fittings constructed arranged and operating sub-
stantially as and for the purposes described herein and illustrated on the accom-
panying drawing.
BREWER & SON,
London and Leeds, Agents for the Applicants.
BREWER & SON,
London and Leeds, Agents for the Applicants.