Improvements in Door Closing and Checking Devices.
Year: 1898

page_text: Date of Application, 23rd Mar., 1898-Accepted, 7th May, 1898
COMPLETE SPECIFICATION.
Improvements in Door Closing and Checking Devices.
I, ROBERT BERGNER, of 22, Katharinenstrasse, Leipzig, in the Empire of Germany,
Lock-smith, 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 improvements in door closing and checking devices,
which consists of the arrangement of the hydraulic piston which is moved in the
direction of the spring axis, that is to say, vertically, this movement having been
hitherto always horizontal.
In the annexed drawing,
Fig. 1 is a section in elevation of the arrangement, the piston being raised.
Fig. 2 is a similar view, the piston being lowered.
Fig. 3 is a plan view.
The axle A which is connected in the usual manner with the spring b and the
actuating lever d, projects vertically downwards through the bottom of the spring
casing, on which the cylinder C is arranged, in which is the regulating piston D.
The piston D carries at its bottom a valve f, which by a pressure from below
(Fig. 2) closes the ports g, and by a pressure from above opens the same (Fig. 1);
the piston is further provided at its upper border with a screw shaped Hange a,
which is operated on by noses h of a collar E, fixed to the axle A and projecting into
the cylinder C.
し
On the outside of the piston D there is fixed a pin or the like k, which is guided
in its movement by a vertical groove provided in the inside of the cylinder C. By
this means the piston D cannot turn but only move upwards or downwards within
the cylinder.
As the collar E is by means of the actuating lever d and axle A turned when the
door is opened, it moves by means of its noses h and the flange a the piston D
upwards or downwards in the direction of the axle, which by means of the channel m
which can be regulated for the proper passage of the liquid by means of the set
screw i, the ports g, and the valve f, effects the usual displacement of the liquid in
the cylinder in the one or the other direction, besides having a controlling action on
the movement of the spring b.
By means of the arrangement of a piston having a vertical movement under the
spring casing it is possible, to use a much larger piston than in previous devices of
the kind, it follows also, that when the door is moved a great resistance is effected
immediately, and there is also the advantage, that the device can be used for either
right or left handed doors.
ascertained the nature of this
invention and in what manner the same is to be performed, I declare that what I
claim is :-
Having now particularly described and
An improved door closing and checking device, in which the regulating or checking
siston D is dienlaceable vertically in the direction of the spring axle and is for this

page_text: purpose provided with a helicoidal or inclined flange a, which is operated on by
The piston being prevented from
noses h of a collar E fixed on the spring axle.
turning in its housing for the purpose set forth.
Dated this 23rd day of March 1898.
HERBERT HADDAN & Co.,
Agents to Applicant, 18, Buckingham Street, Strand, W.C., London.