Year: 1886

page_text: Date of Application, 20th Dec., 1886
Complete Left, 20th Sept., 1887
Complete Accepted, 21st Oct., 1887.
I, ALBERT SCHMID Mechanical Engineer of Zurich, Switzerland, do hereby declare
the nature of this invention to be as follows:-
The more salient features of this safety valve consist of an outer casing in which
is fixed the valve also of a double valve seat provided with apertures and forming at its
upper part annular faces on which the valve rests.
The central portion of the valve seat is prolonged in the form of a spindle threaded
at its upper end on which a cap which may be bedded in a mushroom joint is fastened
by nuts screwed onto the spindle.
An easing screw serving to open the valve if necessary finds leverage on the spindle
and is screwed through the outer casing.
The valve resting flat on the annular seating is provided with lateral openings and
centrally in the valve is mounted a tube or socket which limits the stroke of the valve
by coming in contact with the cap. The pressure is preferably provided by means of
a helical spring which as the valve rises is compressed against the cap.
On the pressure of the steam becoming sufficiently great, the valve is lifted from its
seat carrying with it the outer casing, the easing screw and the tube or socket at the
same time enclosing the apertures both in the valve seating and in the valve proper
thus allowing the steam to escape with great rapidity.
The upward motion of the valve is checked by the contact of the tube or socket
with the cap and the compression of the spring controlled by the same means & which
forces the valve down on its seat again.
The whole apparatus may be boxed in to prevent anyone tampering with it.
Dated this 4th day of March 1887

page_text: I, ALBERT SCHMID, Mechanical Engineer of Zurich, Switzerland, 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 will be best understood by reference to the accompanying drawings
of which,
Figure is a plan on line A B of Figure 2 and
Figure 2 is a vertical section of the safety valve.
The more salient features of this safety valve consist of an outer casing i in which
is fixed the valve f; also of a double valve seat a provided with apertures g' and
forming at its upper part annular faces on which the valve rests.
The central portion of the valve seat a is prolonged in the form of a spindle c
threaded at its upper part on which is screwed a cap n fastened by a nut.
The threaded portion of the spindle is further provided with a pressure piece e
which may be bedded in a mushroom joint d and fastened by a nut and jam-nut.
An easing screw m serving to open the valve if necessary finds leverage on the
spindle and is screwed through the outer casing i.
The valve resting flat on the annular seating is provided with lateral openings g
and centrally in the valve is mounted a tube or socket h which limits the stroke of the
valve by coming in contact with the cap n.
The pressure is preferably provided by means of a helical, spring k which as the
valve rises is compressed against the pressure piece e.
On the pressure of the steam becoming sufficiently great the valve is lifted from its
seat carrying with it the outer casing i, the casing screw m and the tube or socket /
at the same time unclosing the apertures both in the valve seating and in the valve
proper thus allowing the steam to escape with great rapidity.
The upward motion of the valve is checked by the contact of the socket with the
cap and the compression of the spring controlled by the pressure piece e which
forces the valve down on its seat again.
The whole apparatus may be boxed in to prevent anyone tampering with it.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed I declare that what I claim is :-
1. In a safety valve the combination with a double concentric valve seat such as a
the centre portion of which is prolonged in the form of a spindle onto which is secured
the cap and pressure piece e the valve seating being provided with apertures g' of a
valve consisting substantially of an outer casing i screw m tube or socket & helical
spring and apertures g the whole acting substantially as described.
2. The complete safety valve substantially as described.
Dated this 20th day of September 1887.