Improvements in Door Closing Apparatus.
Year: 1892

page_text: COMPLETE SPECIFICATION.
Improvements in Door Closing Apparatus.
I LUDWIG LOETS of 49¹ Catherinestrasse Hamburg in the Empire of Germany
Merchant 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 for improvements in door closing apparatus relates to that class
of apparatus which are usually let into the floor and has for its object to construct
a door closing apparatus in such manner that the door is prevented from any
undesired movement.
In the accompanying sheet of illustrative drawings
-
Figure 1 is a vertical longitudinal section of a door closing apparatus constructed
according to this invention.
Figure 2 is a vertical cross section on the line A-B Figure 1.
Figures 3 and 4 are plans of the combined apparatus with locked stop, the cover
being removed.
The apparatus is enclosed in the box shaped case G provided with the cover D.
The door is secured to a square headed swivel pin Z mounted in the case G in the
axis of motion of the door. The pin Z is provided with two projecting pieces kk';
the upper piece k is formed into a circular segment at its outside edge and is
provided with an indent b. One end of a helical spring fis attached by means
of the bolt o to the projecting pieces, and the other end is attached by. the
bolt o to the opposite end of the case. A bridge piece d is secured to the case G
and carries the stop arrangement acting on the rotating pin Z. This stop arrange-
ment consists of a bolt c actuated by a spring f in a guide cylinder g. The end of
the bolt at the extremity next to the segment shaped projecting piece k terminates
in a rounded tooth and a nut at the other end regulates the pressure of the bolt
through the spring f2.
When the door is closed the tooth fits into the indent b on the segment as shown
in Figure 3 and so holds the door shut. As the bolt c can only move at right
angles to the rotating axis of the door a certain power must be expended when the
door is opened in order to separate the sloping edges of the tooth and the indent,
and to push back the bolt c so removing the check to the opening of the door.
When this is done the spiral spring comes into operation.
By the arrangement of another or several other indentations in the segment of
the upper projecting piece the door can be held in any other than the closed
position as for instance when wide or partly open in order to cool the room &c.
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 :-
A door closing apparatus in which besides the automatic closing of the door the
movement of the latter is checked-for example in the closed position-by means
of a bolt c actuated by means of a spring f2 and sliding in a fixed guide cylinder g
and which bolt engages in a notch or indentation bin a segment piece k formed on
the pivot of the door, whilst a strong spring f connected to the case and to the
said pivot effects the closing of the door.
Dated this 14th day of November 1892.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.