A New or Improved Door-check.
Year: 1892

page_text: Date of Application, 10th May, 1892
Complete Specification Left, 10th Feb., 1893-Accepted, 18th Mar., 1893
PROVISIONAL SPECIFICATION.
A New or Improved Door-check.
I, WILHELM HUGO DIELITZSCH, of Chemnitz, in the Empire of Germany,
Manufacturer, do hereby declare the nature of my invention to be as follows:-
This invention relates to a buffer mechanism for checking the motion of the door,
when it is suddenly closed.
It comprises three principal parts, namely a specially shaped double armed lever
pivoted to the door frame or casing above the doorways, hereafter called the buffer
lever; a striking lever or flap pivoted to the upper edge of the door and adapted
to act on one end of the buffer lever; and a buffer plate or contact piec fixed to
the upper edge of the door and adapted to come into contact with the opposite end
of the buffer lever.
The fulcrum of the buffer lever is horizontal, and perpendicular to the face of
the door frame, the fulcrum of the striking lever is also horizontal, but parallel to
the upper edge of the door.
One end of the buffer lever carries a buffer, which under certain conditions,
drops between the door casing or frame and the buffer plate, which projects upward
from the upper edge of the door.
The opposite end of the buffer lever, which serves as a counterweight, is bent
forward and provided with an inclined face adapted to come into contact with the
striking lever mentioned above.
When the door is being closed rapidly, the striking lever or flap stands upright
and strikes against the inclined face of the buffer lever, thereby turning the latter
on its fulcrum and causing the buffer to drop into the path of the buffer plate fixed
to the door, in consequence of which the door is checked and recedes somewhat
from the elastic buffer.
During this momentary pause, the buffer is drawn upward by the weight of the
opposite lever end, and the door can now be closed slowly.
If the fully open door is closed gently, the buffer has time to move out of the
way of the buffer plate, after the lever has been released by the flap.
When the door is being opened, the flap or striking lever drops down, to make
room for the buffer lever.
Instead of a striking lever pivoted on a horizontal fulcrum, a fixed flap may be
used, provided, that, instead of the inclined face, the buffer lever has a hinged
extremity, which recedes out of the way, when the door is being opened.
Dated this 10th day of May 1892.
HUELSER & Co.,
Agents for Applicant.
COMPLETE SPECIFICATION.
A New or Improved Door-check.
I, WILHELM HUGO DIELITZSCH, of Elisenstrasse, No. 33, Chemnitz, in the
Empire of Germany, Manufacturer, 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 a door check or buffer mechanism for preventing the
too sudden closing of doors.

page_text: upper part of a closed door which is provided with a door check embodying my
invention.
Fig. 2 is a plan of the mechanism corresponding to Fig. 1.
Fig. 3 is a side elevation of the mechanism, when the door is partly open.
Fig. 4. the same, when the door is being closed.
The mechanism comprises three principal parts, namely, a specially shaped two-
armed lever a pivoted at c to the door frame or casing W above the doorway; &
striking lever or flap d pivoted to the upper edge of the door at x and adapted to
act on one end of the lever a; and a buffer plate or contact piece e fixed to the
upper edge of the door and adapted to come into contact with the opposite end of
the lever a..
The fulcrum of the buffer lever a is horizontal, and perpendicular to the face of
the door frame, the fulcrum of the striking lever d is also horizontal, but parallel
to the upper edge of the door.
One end of the buffer lever carries a buffer b, which, under certain conditions,
drops between the door casing or frame and the buffer plate e, which projects
upward from the upper edge of the door.
The opposite end of the buffer lever, which serves as a counterweight, is bent
forward and provided with an inclined face fadapted to come into contact with the
striking lever d.
When the door is being closed rapidly, the striking lever d strikes against the
inclined face of the buffer lever a, thereby turning the latter on its fulcrum c, as
shown by the arrow in Fig. 1, and causing the buffer b to drop into the path of the
buffer plate e fixed to the door, as shown in Fig. 1 by dotted lines, in consequence
of which the door is checked and recedes somewhat from the elastic buffer.
During this momentary pause, the buffer b is drawn upward by the weight of the
opposite lever arm f, and the door can now be closed slowly.
If the fully opened door is closed gently, the buffer 6 has time, to move out of
the way of the buffer plate e, after the lever a has dropped off the flap d.
When the door is being opened, (Fig. 3) the flap d'drops down, to make room
for the buffer lever a, and allows the door to be opened.
Instead of a striking lever d pivoted on a horizontal fulcrum, a fixed flap may be
used, provided, that instead of the inclined facef, the buffer lever a has a hinged
extremity, which recedes out of the way, when the door is being opened.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, I declare that what
I claim is ;-
A door check comprising in its construction a buffer attached to a lever α, and
an abutment e, the said lever being arranged in such a manner, as to get between
the said abutment e and the door casing, when the door is being closed rapidly,
substantially as described.
Dated this 10th day of February 1893.
FAIRFAX & WETTER,
433, Strand, London, Agents.