Improvements in Apparatus for Closing Doors.
Year: 1893

page_text: Date of Application, 1st Dec., 1893
Complete Specification Left, 31st Aug., 1894-Accepted, 6th Oct., 1894
PROVISIONAL SPECIFICATION.
[Communicated from abroad by GOTTFRIED FRIEDRICH WILHELM JOSEPH
STEMANN, of 98 Raboisen, Hamburg, Merchant, and MORITZ PHILIPP
CARL FRIEDRICH AUGUST SEEBOLD, of 36 Kommandantenstrasse, Berlin,
Civil Engineer, both in the Empire of Germany.]
Improvements in Apparatus for Closing Doors.
I, HENRY HARRIS LAKE, of the Firm of Haseltine Lake & Co., Patent
Agents, 45 Southampton Buildings, in the County of Middlesex, do hereby
declare the nature of this invention to be as follows:-
This invention, relates to an automatic apparatus for closing doors, which
comprises a spring-actuated push-rod arranged in the upper edge of the door and
which, on the latter being opened, is moved back in the direction of the door edge
by means of a draw-rod adapted to turn on the door case. The operation of the
draw-rod, that is to say the back movement of the same relatively to the door
which opens, takes place in consequence of the eccentric position of the pivot of
the draw-rod with regard to the pivot of the door. At the commencement of the
opening movement, when the back movement of the draw-rod is but slight, this
back movement is aided by means of a special cam, the action of which causes the
pivot of the draw-rod to be displaced towards the pivot of the door so that the
eccentricity of the two pivots diminishes. By this means I obtain a more uniform
distribution and better utilization of the spring power acting upon the push-rod.
A door-closing apparatus constructed according to our invention possesses a
push-rod which may be let into the upper edge of the door and adapted to be
displaced on a bar, namely by means of a pin sliding in a slot of the said bar and
an eye.
Between these two parts is a spring which surrounds the push-rod and
tends to press the latter to one side. The head of the before-mentioned pin is
embraced by a draw-rod having a pivot at its other end, which is fitted to turn in a
sliding-piece which can move in a slot formed in a bar secured to the door case.
On a square of the pivot of the said draw-rod is provided a cam bearing against a
pressing roller.
When for the purpose of opening it the door is turned upon its pivot the said
can firmly connected with the pivot of the draw-rod is also caused to turn so that
instead of its recess the full part of the same will bear against the pressing roller
which is immovably arranged on the bar fixed to the door case. By this means
the before-mentioned cam, pivot, sliding-piece, draw-rod and push-rod are moved
back against the pressure of the spring surrounding this push-rod, until the sliding
piece strikes against the end of the slot in the bar secured to the door case.
the further opening of the door the back movement of the draw-rod and push-rod
relatively to the door takes place solely in consequence of the eccentric position of
the aforesaid two pivots, the push-rod being pulled back a distance equal to that
between the two pivots until the door is quite open:
In
The door is automatically closed by the compressed spring which surrounds the
push-rod causing all the parts to move back in the reverse order to that in which
they move when the door is opened. The latter is sufficiently secured in its closed
position by the pressing roller engaging with the recess in the above-mentioned
cam.

page_text: Improvements in Apparatus for Closing Doors.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent
Agents, 45 Southampton Buildings, in the County of Middlesex, 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 an automatic apparatus for closing doors, which com-
prises a spring-actuated push-rod arranged in the upper edge of the door and
which, on the latter being opened, is moved back in the direction of the door edge
by means of a draw-rod adapted to turn on the door case. The operation of the
draw-rod, that is to say the back movement of the same relatively to the door
which opens, takes place in consequence of the eccentric position of the pivot of
the draw-rod with regard to the pivot of the door. At the commencement of the
opening movement, when the back movement of the draw-rod is but slight, this
back movement is aided by means of a special cam, the action of which causes the
pivot of the draw-rod to be displaced towards the pivot of the door, so that the
eccentricity of the two pivots diminishes. By this means is obtained a more
uniform distribution and better utilization of the spring-power acting upon the
push-rod.
In the accompanying drawing,
Figure is a sectional side elevation of this improved door closing apparatus,
fastened to a door and the door case belonging thereto and in its position of rest,
that is to say, when the door is closed;
Figure 2 is a similar view, but in position in which the door is partly opened;
Figure 3 is a top view of Figure 2, and
Figure 4 is a detail.
The push-rod a which may be let into the upper edge of a door A and adapted
to be displaced on a bar b, namely by means of a pin a sliding in a slot of the
barb and an eye b. Between these two parts is a spring e which surrounds the
push-rod a and tends to press the latter out of the eye b₁ (Figure 1). The head of
the pin a¹ is embraced by a draw-rod d having a pivot d at its other end which is
fitted to turn in a sliding piece e which can move in a slot formed in a bar f secured
to the door case B. On a square of the pivot d' of the said draw-rod is provided
a cam g bearing against a pressing roller h.
When for the purpose of opening it the door A is turned upon its pivot i the
said cam g firmly connected with the pivot d¹ of the draw-rod is also caused to
turn so that instead of its recess g the full part of the same will bear against the
pressing roller which is immovably arranged on the bar fixed to the door case.
By this means the cam g, pivot d', sliding piece e, draw-rod d and push-rod a are
moved back against the pressure of the spring surrounding this push-rod, until the
sliding-piece strikes against the end of the slot in the bar f secured to the door-
At this stage the several parts occupy the positions shown in Figures 2
and 3. In the farther opening of the door the back movement of the draw-rod d
and push-rod a relatively to the door takes place solely in consequence of the
eccentric position of the aforesaid two pivots d¹ and i, the push-rod being pulled
hack a distance equal to that between the two pivots until the door is quite open,
as illustrated by dotted lines, Figure 3.
case.
The door is automatically closed by the compressed spring which surrounds the
push-rod causing all the parts to move back in the reverse order to that in which
they move when the door is opened.
The latter is sufficiently.secured in its closed position by the pressing roller
engaging with the recess g' in the cam 9.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, as communicated to me by
my foreign correspondents, I declare that what I claim is :-
:-
The combination of a spring actuated push-rod a movably connected to the edge
of a door, a draw-rod d being at one end connected to the said push-rod and at the
other end guided by means of a pivot d' which is fitted to turn in a sliding piece e
designed to move in a slot of a bar secured to the door case, the said pivot carrying
a cam g which is adapted to bear against a pressing roller fastened to the door
case, substantially as and for the purpose set forth.
Dated this 31st day of August 1894.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.