Year: 1886

page_text: I, HUGO HARTUNG, of 41 Prenzlauerstrasse Berlin in the Empire of Germany,
Cast Steel Manufacturer, do hereby declare the nature of this invention to be as
follows:-
The door checks heretofore used for closing doors gradually, consisted generally
of a single cylinder and piston sliding in the same, actuated in a well known
manner by a volume of liquid and checking the action of the springs which closes
the door.
This invention consists principally in the combination of two sliding rods
arranged at right angles to each other; one of these aliding rods is formed tele-
scopically and the other with a piston and cylinder, and these sliding rods are
connected together and compounded by means of links.
The telescopic rod consists of a middle portion, each end sliding in a tubular
portion.
The ends of the latter are respectively connected near the top, to the middle
of the door by means of a pin (or hinge) and to the casing containing the spring
which closes the door fixed to the door post or other suitable place.
A modification consists in employing at each end of the telescopic rod in the
tubular portion thereof, a spring which causes the closing of the door & dispenses
with the separate spring & casing already named.
The piston rod is rigidly connected, or may be hinged to the middle portion of
the telescopic rod, and the cylinder working on the said pistons by means of links
and hinges to the tubular portions of the telescopic rod, in such a manner that
a compound sliding of the rods is obtained.
This arrangement may be reversed by securely connecting the cylinder with
the middle portion of the telescopic rod and the piston to the said links.
It may be remarked that in the latter case and when hinging the piston rod to
the telescopic rod the tubular portion of the latter and the links, will have to be
arranged only on one side of the cylinder.
The working of the apparatus is as follows:-
When opening the door the telescopic rod is shortened, in consequence of the
tubular portions approaching each other, and the cylinder, sliding on the piston
rod, leaving the middle portion of the telescopic rod.

page_text: The liquid contained in the cylinder (viz, oil, glycerine or air) passes in the well
known manner from one side to the other side of the piston, and when closing the
door, the liquid passed, acts checking onto the spring in the casing which closes the
door or on the spring when employed in the tubular portion of the telescopic rod.
The employment of two rods connected together and compounded by means
of links, in the described manner forms a very simple & reliable construction of
door check.

page_text: I, HUGO HARTUNG of 41 Brenzlauerstrasse, Berlin in the Empire of, Germany,
Cast Steel Manufacturer, do hereby declare the nature of this invention and in
what manner the same is to be performed to be particularly described and ascer-
tained in &,by, the following statement:—
The door checks heretofore used for closing doors gradually, consisted generally
of a single cylinder, and piston sliding in the same, actuated in a well known
manner by a volume of liquid, and checking the action of the springs which close
the door.
And in order that this invention may be better understood I have caused to be
appended hereunto one sheet of drawings marked with letters of reference indicating
like parts in the various figures..
Figs. 1 and 2, are detached sectional side elevations, and Fig. 3, a plan, showing
my improved door check applied.
The invention consists principally in the combination of two sliding rods a, k
arranged at right angles to each other; one of these sliding rods a, is formed
telescopically and the other k with a piston and cylinder, and these sliding
rods a &k and cylinder 1, are connected together and compounded by means of
links .
The telescopic rod a consists of a middle portion b, each end sliding in a tubular
portion m.
The ends of the latter are respectively connected near the top, to the middle of
the door, by means of a pin d (see Fig. 2), or hinge, and pawl o to the casing F,
containing the spring which closes the door, fixed to the door post or other
suitable place.
A modification consists in employing at each end of the telescopic rod a in the
tubular portion m thereof, springs f and f¹, respectively, which causes the closing
of the door and dispenses with the separate spring and casing F, already named.
The piston rod k is rigidly connected or may be hinged to the middle portion b
of the telescopic rod a at g, and the cylinder 7 working on the said pistons l¹ by
means of links z, and hinges to the tubular portions m of the telescopic rod a, in
such a manner that a compound sliding of the rods a and k is obtained.
This arrangement may be reversed by securely connecting the cylinder with
the middle portion 6 of the telescopic rod a, and the piston to the said links s.
It may be remarked that in the latter case and when hinging the piston rod k to
the telescopic rod a, the tubular portion m of the latter, and the links s, will have
to be arranged only on one side of the cylinder b.
The working of the apparatus is as follows:-
When opening the door, the telescopic rod a is shortened, in consequence of the
tubular portions m approaching each other, and the cylinder 2, sliding on the piston
rod k, leaving the middle portion b of the telescopic rod a

page_text: The liquid contained in the cylinder l, (viz, oil, glycerine, or air), passes in the
well known manner from one side to the other side of the piston, and when
closing the door, the liquid passed, acts checking onto the spring in the casing F,
which closes the door, or on the springs f, f¹ when employed in the tubular
portions m of the telescopic rod a.
The employment of two rods a and k connected together and compounded by
means of links z, in the described manner forms a very simple and reliable con-
struction of door check.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what
I claim is:
A door spring, the action of whioli is transmitted, on the door moving, by means
of rods sliding in each other to and controlled by a check arrangement connected
with the sliding rods and cylinder, and moving at a right angle to the latter,
substantially as described and illustrated.
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