Improvements in Door Checks.
Year: 1897

page_text: Date of Application, 24th May, 1897-Accepted, 14th Aug., 1897
COMPLETE SPECIFICATION.
Improvements in Door Checks.
We, GUSTAV BORTMANN, and REINHOLD MUNKWITZ, both of 78 Ammonstrasse,
Dresden (formerly of Leipzig), in the Empire of Germany, Manufacturers, do
hereby declare the nature of this invention and in what manuer the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
This device relates to a device for avioding the violent closing of doors, by
cushioning the movement of the door as it is about to close.
In the annexed drawing:-
+
Figs. 1, 2, and 3 are sectional plans showing this device arranged on a door in
three different positions. Fig. 5 shows the front view of Fig. 3. Fig. 4 shows a
detail of the device whilst, Fig. 6 shows a modified coustruction.
:
This device consists essentially of the lever a arranged correspondingly with a
spring d and pivoted on the army and of the lever b also pivoted on the arm g.
The spring d is here fixed on the wall and the arm g on the door.
The lever a is pivoted on pin i and the lever b on pin
lie in parallel direction side by side.
on the arm g and both
The step like end of the lever b is so formed, that it stands in the same plane, in
which the lever a lies, and abuts against the end a' of the lever a when the levers a
and b are turned round the pins in the direction of the arrows in Fig. 2.
The spring s which stands with its ends in slots on the levers a and b tends to
turn the levers in the direction of the arrows (Fig. 2) round the pins i i¹ so that the
end a¹ of the lever a is kept lying on the step like end of the lever b and when
one of the levers a and b is turned the other lever follows this movement.
As the levers a and b have no common turning axis the end of the lever a
when the levers are turned slides on the step like end of the lever b on which it is
kept lying by the spring s.
This device operates in the following manner :-
When the door is about to close, the lever a pushes with its free standing end
against the free standing end of the spring & as shown in Fig. 1 and takes with it
the spring d until the force imoving the door is balanced by the tension of the
spring d. Throughout this course of the spring d the end of the latter has described
an arc and has turned the lever a so far round the pin i that, as shown in Fig. 2
the end a¹ of the lover has slid on the step like end of the lever b from the
one step to the other, and thus the lever a is kept in this position and cannot
turn back.
By the tension further given to the spring d the lever a is again turned a little
more round the pin i whereupon the spring d slides off the lever u and swings back,
as the latter is kept in this position and cannot turn backwards.
When the door, which has thus been freed from the pressure of spring d is
brought from the position in Fig. 2 into that of Fig. 3 that is to say when the door
is closed, which is effected either by means of one of the usual door closing devices
or by hand, the spring d pushes as shown in Fig. 3 against the lever b and turns it
so far in the direction of the there shown arrow backwards on the pin that the
lever a influenced by the spring 8 springs back into its original position (Fig. 1).

page_text: When the door is again opened the lever a is moved a little as it passes the
spring & without the end a sliding on the other step of the lever b so that when
the door is again shut, the lever'a operates in the same manner as before described.
The construction of this device shown in Fig. 6 differs from that previously
described, only in the lever b being omitted and the lever a combined with a
stopping pin and with a spring s fixed on the arm g.
The spring s fixed at one end on the arm gand at the other end on the lever a,
tends to keep the lever a lying on the stopping pin n thus in the position shown in
Fig. 6. In this position the lever when the door is shut, as in the previously
described construction of the device, pushes against the free standing end of the
spring and takes the spring with it when the latter is tensioned thereby balancing
the force moving the door partly or completely until the spring slides from the
lever and swings back whereupon the door can be closed simply by pressing it to.
When the door is opened, the lever a escapes past the spring d. When the door
is then again shut the lever a operates in the same manner as described.
:
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. The combination with a door and its frame of an arm on the former a lever
pivoted on said arm a spring on the frame, a stop on said arm adapted to retain
said lever in such position that on the closing of the door the lever meets the
spring, deflects and trips past the same, and a spring for returning the lever to its
original position substantially as and for the purpose set forth.
2. The combination with a door and its frame of an arm on the former, a lever a
pivoted on said arm, a second lever b pivoted on said arm and forming a detent for
said arm a in either of two positions a spring d on the fromo adapted on the closing
of the door to be met by the end of lever a and be tensioned thereby to deflect the
lever until it is held by the detent lever bin its second position and afterwards
to strip the lever and on further closure of the door strike and deflect detent
lever b, and a spring for returning the lever and detent lever b into either first
position substantially as and for the purpose set forth.
Dated t
HERBERT HADDAN & Co.,
18, Buckingham Street, Strand, London, Agents to Applicants.