IMPROVEMENTS IN APPARATUS FOR PREVENTING THE SLAMMING OF DOORS
Year: 1884

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I, WILHELM BAHRE of 3 Bessel Strasse Berlin in the Kingdom of Prussia and
German Empire, Merchant, do hereby declare the nature of my said invention for
IMPROVEMENTS IN APPARATUS FOR PREVENTING THE SLAMMING OF DOORS," and
in what manner the same is to be performed, to be particularly described and
ascertained, in and by the following statement:-
In order to make doors provided with a slammer shut noiselessly the inventor
applies the following slamming-preventer with automatic disengagement.
Fig. 1, 2 & 3 represent a plate a fixed to door A into which two sockets b and b₁
are riveted; in them is placed the bar c, which has on its upper end a rubber ball d,
moves, upwards and downwards. A cord e is fastened by its lower end to bar c and
by its upper end to a doublo joint-lever f (fig. 1.)
This lever slides on its other side g on a hook h, the hook g is screwed on to the
door-post B. On the cross-beam C, over the door is a spring 1 (fig. 8.) provided
with rubber-plates i, k, are screwed together and by means of ball d take up the
shock of the door when slammed to. The function of the apparatus is as follows: If
the opened door A is slammed to by the slammer then the part g of the joint-lever f
slides over the hook h and lifts by means of cord e the bar c too high, that the
rubber-ball & comes on a level with the spring l.
Thereupon if the door is shut quickly à flies on to and therefore receives the
shock, which must be noiseless; owing to the force the door rebounds a little and as
part g of the joint-lever has slid down from the hook and as the cord e hias become
loose the bar and the ball sink and the door shuts of itself, in case the force used in
shutting the door is moderate then the part g of the joint-lever f goes over the
hook hand the raised ball sinks before touching 1.
Fig. 4 shows another arrangement in which bar c extends downwards in an
angular projection m. The raising and sinking of bar c is likewise effected, as just
described, by the slinding of m, over hook h; to prevent the bar c from turning
m runs in a tin groove n. Fig. 5. shows a similar arrangement. In it c rests with
its lower end on a one-armed lever o. The raising and sinking of it is effected in
the way described above.
Fig. 6 and 7 show an apparatus in which the head d of the bar c, which latter is
as represented in figs. 1 to 5 in a firm socket, consists of 2 half-balls, which are so
arranged that they are bent with their lower end q so far downwards by a fork
CD 1.31

page_text: moveable in hinges and situated under spring that the two ends of parallel
projecting arms q and q¹ strike the head d on that very spot on which the two
half-balls are placed together.
If the door is to be shut (with this apparatus) then head d is seized by the
fork g and q¹ and owing to the incline of q and q¹ it is in its farther course lifted
to t on and
In case of violent shutting, the head d will bound against and thus prevent the
door being shut, then go back and take up its old position.
-
In case of slow shutting the head d will run up the incline of q and q' and having
left that sink down directly. On opening the door, p returns to the position. dotted
in Fig. 6.
Fig. 9. shows an arrangement in which the bar c contains 2 arms r and 8 bent
reversely upwards and downwards rectangularly, and the first of them has a
rubber-pad t. The spring u reaching over the lower arms brings the latter
always into the position shown in fig. 9. The function of this apparatus is as
follows. If the door is being shut then arms of the bar bounds against double
lever and t, which is turned by a comes into the position shown in Fig. 10, and
bounds against spring 1, whereupon the door rebounds a little, spring u brings the
lever back into the position shown in Fig. 9 and the door shuts noiselessly of itself.
On opening the door arm s presses the lever v into the dotted position shown in
Fig. 11, and the latter lets the arm s pass through.
The Figs. 12 & 13 of the II sheet form a variation of fig 12 & 13 in the I sheet.
The purpose of them is to prevent the door from warping, which could be caused
by the frequent use of it, and to transfer the effect of the shock to the middle of the
door. For this purpose the bar c is provided with buffer d, which strikes against
spring and is connected through joint-lever b' and cord e with the double angle,
is fixed in the middle of the door (Fig. 12).
The same arrangement is shown in Fig. 13. with the difference however, that the
double angle is replaced by a straight lever f', which runs upwards and down-
wards in guides m. Figs. 14, 15 & 16 (Sheet II) show other arrangements, in
which the door A is provided with a striking-pin g¹, which when the door is
thrown to strikes against a weight h, which is suspended free from a support i¹
fixed to the door frame B. The buffer is connected with the weight h¹ by means
of corde, which runs over a roller k¹. Figs 15 & 16 differ from fig: 14. solely
therein that the cord e is replaced in them by levers l¹.
The principle of these constructions and the substance of this invention consists
therein, that a lever, buffer or similar thing is projected when the door is thrown to
between the door itself, and the door frame to catch up the pin, and to effect a
noiseless closing of the door.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
The lever or buffer projected (when the door is thrown to) between the door and
door frame to engage the pin, and to effect a noiseless closing of the door such as
shewn and described.