Improvements in Door-closing and Door-checking Apparatus.
Year: 1891

page_text: Date of Application, 9th Feb., 1891
Complete Specification Left, 31st July, 1891-Accepted, 26th Sept., 1891
PROVISIONAL SPECIFICATION.
Improvements in Door-closing and Door-checking Apparatus.
We, HERMANN SCHUBERT and RUDOLPH WERTH, of 41 Prenzlauer Strasse,.
Berlin, in the German Empire, Manufacturers, do hereby declare the nature of this
invention to be as follows:-
The new apparatus proposed aims to permit the rapid shutting of the door, as it
happens occasionally, what the usual apparatus do not allow without destruction.
In these the air compressed, which prohibits the rapid shutting of the door by its
resistance and thereby the disturbing clap, cannot escape quickly to the interior of
the stopping cylinder through its valve. Therefore we have in these apparatus a
great resistance of the air in the mentioned case and as they are constructed without
elastic parts, a destruction of them is very easily effected thereby.
The new apparatus is now composed with the aim to prohibit this destructive
effect by adding elastic parts, which follow a rapid extension, as it is produced by a
violent opening or shutting of the door, without losing a firm connection with the
latter.
In order to make our invention more clear, we refer to the accompanying
drawing, in which similar letters refer to similar parts throughout the different
views.
The apparatus has a tube a (Figs. 1 and 2) which contains a rod c. The latter is
guided by the piston e and by the box fat the aperture of the tube. It is a spiral
spring between these two, in combination with them, which tends to remove the
piston e from the box f. The rod c is therefore attracted in the interior of the tube
by this spiral spring.
That part of the apparatus, as above described, is attached at c¹ to the part g and
the latter to the door. By its violent shutting the resistance of the air compressed
in the stopping cylinder h, which cannot escape instantaneously, repels the piston
in h and thereby the tube af (Fig. 1). The air can now slowly escape, at pleasure
after the shutting of the door. But the piston e remains contrarily more at the end
of the tube by the pressure of the spiral spring (Fig. 2) when our apparatus shuts
the door by itself, without anyone's action. In this case the combination of its
parts is almost a fixed one, as that with the door.
It is therefore the peculiar and new part of this apparatus with pneumatic stop to
shut the door the tube a c for the guiding of the folds, which is constructed as above
described. It is the aim of the parts a and c in the ordinary working to transfer
the pressure of the box f, combined with the joint c¹ by the bar c to the fold
(Fig. 2) and at the same time to let yield the apparatus to the traction of a fold,
when the door is rapidly shut, in which case a is retired from c, (Fig. 1), without
producing a remarkable acceleration of the piston in the stopping cylinder h.
Dated this 6th day of February 1891.
HERMANN SCHUBERT,
RUDOLPH WERTH,
By Robert Deissler,
From A. Kuhnt & R. Deissler,
38, Alexanderstrasse, Berlin, C., Germany, Agent for the Applicants.

page_text: COMPLETE SPECIFICATION.
Improvements in Door-closing and Door-checking Apparatus.
We, HERMANN SCHUBERT and RUDOLPH WERTH, of 41, Prenzlauer Strasse,
Berlin, Germany, Manufacturers, 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:
i
-
Our invention relates to an improved device, or apparatus for silently closing
doors, automatically, with a view to preventing the noise and vibration that usually
occurs when said doors are violently pushed or slammed, and to guard against the
possibility of the same being left ajar to create draught and consists of two cylinders
arranged to be parallel or nearly so when at rest and provided with internal springs
operating pistons and rods hinged or fulcrumed with or upon a pivotted lever in
such a manner as to permit the door to which said apparatus is attached to be
opened to any angle and automatically and silently closed.
In order that our invention and the manner of its operation may be clearly
understood, we have appended hereunto a sheet of drawings, in which:
Fig. 1 is a part sectional plan view of the complete apparatus when in use,
Fig. 2 is a longitudinal section of the smaller cylinder detached from Fig. 1,
illustrating the operation of the spiral spring therein.
Fig. 3 is a sectional view of part of the larger cylinder shown in Fig. 1,
illustrating the position of the spring and piston therein when the door is closed or
at rest.
The
In.carrying our invention into effect we construct of any suitable metal or alloy
of metals a cylinder A, provided internally with a powerful graduated spiral
spring B, through which passes a rod C, one end of which within A carries a
piston D, the opposite end passing through a suitable gland a on the end of A.
The opposite end of A. is provided with a cover E, in the centre of which is fitted
a small chamber b, for admitting air into A, regulated by a spring valve c.
cover E is formed with a projecting lug or extension d, by means of which E is
pivotted to the frame or other suitable stationary part of the door, or adjacent to
the door, and shown by the letter e. Upon the same part e, or near thereto is
pivotted one end of a lever F, the opposite end of which curves towards the free
end of C. The second, or smaller cylinder G we form of any suitable metal
preferably of the same as that of A, provided at one end with a gland, through
which passes a rod H, which when within G is surrounded by a spiral spring g, one
end of which abuts against the inner surface of f, the opposite end abutting against
a piston head provided with a central bore threaded so that it may be screwed
upon the end of H; the head h is provided with a projecting lug h, which fits
within a longitudinal slot formed in G, so that h while being free to slide from end
to end of G, or so much thereof, as is cylindrical, cannot turn round therein. The
tension of the spring g tends to keep H within G as shown by Fig. 2, and as the
power of
g may under varying conditions need adjusting, we attain this by screwing
the rod H more or less into it, and so lessen or extend the expanding: limit of g.
The free or exposed end of H is pivotted to the door to be operated, preferably at
a point below the horizontal level of A. The opposite end of G is solid and curves
in the direction towards C and F and is connected thereto by separate pivots
and j. The tension of the spring B tends to retain C within A, and the manner of
operation is as follows:
When the door is closed and in a position of rest, the rod H would be wholly
within G, as in Fig. 2, and the rod C within A, with its head D, near to the cover E,
and the spring B expanded as shown by the part sectional view Fig. 3. The
valve c being closed. Upon the opening of the door in the direction of the dotted
line Fig. 1, the rod C would be withdrawn from A, and the spring B, compressed,
and the space between E and D in A extended and the power of the spring of the

page_text: C
valve e being less than that of the external atmospheric pressure permits air to
enter A, through c as shown in Fig. 1. The curved formation of the solid end of G
and of the lever F, fulcrumed together with the rod B, and the method of pivotting d
and Fat e relatively to each other permits the door to be opened to any extent and
should this exceed the limit of compressibility of B, the door would then be in a
position to act upon the compressibility of g. When the power exerted in, opening
the door ceases, the depressed spring B, immediately asserts its power to replace C,
within A, and this it does at first somewhat rapidly, but as the air between D and E
would thereby be compressed, and the valve c closed, this would form a cushion
for D, against the power of the spring B, and consequently check its progress.
the meantime the momentum given to the door, withdraws H from G, but this is
again arrested or checked by the spring g, and as the air in A exhausts through
suitable apertures and both springs B and g settle into a position of rest the door
becomes noiselessly closed.
In
It will sometimes occur through atmospheric disturbances that the door has a
tendency to keep ajar, occasioned by the pressure of air being greater upon one
side thereof than the other. To accommodate this is the object of the head hand
the threaded portion of G, as by the turning of the rod H, which may be provided
for in pivotting it upon the door, the lengthening or shortening of this by screwing
it into or out of h, more or less, and the consequent expansion or contraction of g,
the uneven pressure of air upon the door may be compensated at will.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what we
claim is
1. In an improved door closing or checking apparatus: the employment of the
several parts herein described, combined and operating substantially as set forth,
and shown by the accompanying drawings.
2. In an improved door closing and checking apparatus: the construction and
use of a cylinder A having a gland a and cover E, with lug d, in combination with
a chamber b and valve c, the rod C, with piston D, controlled and operated by a
spring B, within A, the chamber or cylinder G, with rod H, and spring g, the
adjustable head h, with lug h¹ operating as a guide within a longitudinal slot in G.
The lever F fulcrumed upon or with G and C; the manner of pivotting F and E
at e, and H to the door to be operated, the whole combined and operating substan-
tially as, and for the purposes, herein described, and shown by the drawings hereunto
appended.
Dated this 31st day of August 1891.
HERMANN SCHUBERT.
RUDOLPH WERTH.
By Robert Deissler,
Agent for the Applicants.