automatic vacuume cys
Year: 1887

page_text: I, FRIEDRICH AUGUST BRÜGGEMANN of Altona, near Hamburg, Germany,
Government Architect, 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 :—
My invention relates to improved valvo apparatus for admitting air into automatic
vacuum brake cylinders.
The said apparatus is shewn in vertical section at Fig. 1 of the accompanying
drawings, Fig. 2 shews a section at right angles to Fig. 1. Fig. 3 a plan with the
cover and diaphragm removed and Fig. 4 shews the combination of the apparatus
with a vacuum brako cylinder.
The apparatus consists of a casing C fixed or formed upon the train pipe T and
containing firstly two valves V V', of which V closes the communication 13 between
the train pipe T and the passage B leading to the brake cylinder, while VI closes a
communication between a passage B1 leading to the brake cylinder and the interior
of the valve box which communicates with the outer atmosphere; secondly the
casing contains a flexible diaphragm D situated in a chamber communicating on
one side of the diaphragm firstly with the train pipe T through
a passage T and
secondly with the outer air through a passage T* on the other side of the diaphragm
the chamber communicates firstly with the passage B and secondly with the
perforated box C² of the valve V1 through a passage C³ into which projects a stem W¹
on a weight W resting upon the diaphragm.
The check valve V is so arranged as to allow air to pass from the brake cylinder
into the train pipe T but to prevent the air from passing from the train pipe into the
brake cylinder so that air can only enter the latter directly from the outer
atmosphere.
The check valve V closes the communication between the outer air and the brake
cylinder while this is exhausted through the train pipe, being caused to close on its
seat both by its own weight and by the excess of external atmospheric pressure.
When the train pipe is exhausted the space under the diaphragm D is also
exhausted through the passage T' and consequently the Diaphragin is pressed down
[Perce 6dl

page_text: so as to close the opening of passage T2, both by the excess of atmospheric pressure
and by the weight W acting on its upper side.
If now air pressure be admitted into the train pipe, the diaphragm D which was
subject to exhaust on both sides, will now be subject to pressure on its under side
through passage T₁ whereby it will be raised off its seat against the downward
pressure of the weight W; by this means, firstly, full atmospheric pressure will be
admitted through passage T2 to the bottom of chamber C and will pass thence directly
into the train pipe T through passage T and secondly the stem W will raise the
valve V1 from off its seat, thus admitting full atmospheric pressure through the top
of chamber and passage B' B into the brake cylinder.
The diaphragm 1) and consequently also valve V' will remain in the raised position
until the air pressure on both sides of the diaphragın is equalized, whereupon the
diaphragm will be pressed down on its seat again by the weight W and stem W',
thus closing the air passage T and also allowing the valve V' to close.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the samo is to be performed I declare that what I
claim is :-
1. In valve apparatus for automatic vacuum brakes, the combination of a check
valve V in the passage leading from the train pipe to the brake cylinder which
prevents air from passing from the former into the latter, a valve V₁ closing
communication between the outer air and the brake cylinder, and a diaphragm D in
a chamber communicating on one side with the train pipe and on the other side with
the chamber of the valve V' and with the brake cylinder, the effect being that when
air is exhausted from the brake cylinder through the train pipe, the valve V is open
and the valve V is closed while when air pressure is admitted into the train pipe, the
valvo V is closed and the diaphragm D is moved so as to raise the valve Vand
admit the outer air into the brake cylinder substantially as herein described.
2. The combination with valve apparatus operating as set forth in the preceding
claim of a passage T leading from the outer air to the underside of the weighted
diaphragm D and a second passage T¹ leading leading from the train pipe T to the
underside of the diaphragm D, so that when the diaphragm is raised off its seat, the
outer air will pass directly through passages T T into the train pipe, but when
the diaphragm is pressed down on its seat, the said communication is cut off,
substantially as herein described.
Dated this 25th day of Numb 1007
ABEL & IMRAY,
Agents for the Applicant.