IMPROVEMENTS IN WATER-METERS, ALSO APPLICABLE TO WATER-MOTORS."
Year: 1881

page_text: LETTERS PATENT to Johann Christian Dennert and George Gustave Lind,
both of Altona, Prussia, German Empire, for an Invention of "IMPROVEMENTS
IN WATER-METERS, ALSO APPLICABLE TO WATER-MOTORS."
PROVISIONAL SPECIFICATION left by the said Johann Christian Dennert
and George Gustave Lind at the Office of the Commissioners of Patents on
the 30th May 1881.
JOHANN CHRISTIAN DENNERT and GEORGE GUSTAVE LIND, both of Altona,
Prussia, German Empire. "IMPROVEMENTS IN WATER-METERS, ALSO APPLICABLE
TO WATER-MOTORS.'
"
This Invention relates to improvements in water-meters in which a reciprocating
piston is moved by the pressure of water in a cylinder; and the object of these
improvements is to obtain a sudden entire closing of the water flow on one side
of the cylinder when the water flow of the other side of the cylinder is opened,
and vice versa. To this effect, a piston fixed to or partly sliding on the hollow
piston rod corresponding with the destination of the mechanism as a motor or as a
measuring apparatus slides inside of the cylinder and the steering rod inside of
the piston rod, which is pushed to and fro by means of the reciprocating tension
of two spiral springs, forms a parallelogram with the valve rod by means of
transverse arms fixed to the ends of both rods. Two hooks of a proper form are
attached to both covers of the cylinder, each of them catching a nose on the
transverse arm in its turn and leaving it free when lifted by the piston rod.
Two discs are fixed to the valve rod in proper distance to open the water flow
and to close the water outlet on one side, when on the other side the water flow is
closed and the outlet is opened.
The water flow chamber, through the centre of which the valve rod is passing, is
arranged parallel to the outlet chamber. The communication chambers on both
sides of the flow chamber are connected with the cylinder and with the flow
chamber or outlet chamber, according to the position of the disc valves.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Johann Christian Dennert and George Gustave Lind in the Great
Seal Patent Office on the 29th November 1881.
JOHANN CHRISTIAN DENNERT and GEORGE GUSTAVE LIND, both of Altona,
Prussia, German Empire. "IMPROVEMENTS IN WATER-METERS, ALSO APPLICABLE
TO WATER-MOTORS."
This Invention relates to improvements in water meters in which a reciprocating
piston is moved by the pressure of water in a cylinder; and the object of these
improvements is to obtain a sudden entire closing of the water flow on one side of
the cylinder when the water flow of the other side of the cylinder is opened,
and vice versa.
To this object a piston fixed to or partly sliding on the hollow piston rod
corresponding with the destination of the mechanism as a motor or as a measuring
apparatus slides inside of the cylinder, and the reversing rod' inside of the
piston rod, which is pushed to and fro by means of the reciprocating tension of
two spiral springs, forms a parallelogram with the valve rod by means of transverse
arms fixed to the ends of both rods. Two hooks of a proper form are attached to
both covers of the cylinder, each of them catching a nose on the transverse arm
in its turn, and leaving it free when lifted by the piston rod.
Two valves are fixed to the valve rod' at the proper distance to open the water
flow and to close the water outlet on one side, when on the other side the water
flow is closed and the outlet is opened.
The water flow chamber, through the centre of which the valve rod is passing,
is arranged parallel to the outlet chamber. The communication chambers on both
sides of the flow chamber are connected with the cylinder and with the flow
chamber or with the outlet chamber according to the position of the valves.
In the accompanying Drawing illustrating our Invention, Figure 1 is a
longitudinal section of a water meter; Figure 2, a front view; and Figure 3, a cross
section thereof; Figure 4 is a side elevation, partly in section, of a water motor,
and Figure a cross section thereof.
A is the cylinder, with the piston B in water motors fastened to, in water
meters sliding on the hollow piston rod C; in the latter case the rod C is provided
with two annular projections e¹, e², by which the motion of the piston B is
transmitted to the rod C; s' is the reversing rod pushed in one direction by the
spring c² and in the other by the spring c².
K', K2, are the hooks for retaining one of the noses or projections m', m³, of the
transverse arms T¹, T2, according to the position of the piston rod C; 8 is the valve
rod with the disc or globe valves V', V2, and the outlet chamber.
Having thus fully described our Invention, what we desire to claim and secure
by Letters Patent is,―
1. In water meters or water motors, the combination of the piston B and the
piston rod O with the reversing rod s¹, the springs c¹, c², the noses m², m³, of the
transverse arms T1, T2, and the hooks K1, K2, substantially as set forth.
2. In water meters and water motors, the combination of the piston rod C and
the reversing rod s¹ with the valve rod 8, substantially as and for the purpose
specified.

page_text: 3. In water meters, the combination of the piston B with the piston rod C and
the annular projections e¹, e³, substantially as described.
In witness whereof, we, the said Johann Christian Dennert and George
Gustave Lind, have hereunto set our hands and seals, this Twenty sixth
day of November, in the year of our Lord One thousand eight hundred
and eighty one.
JOHANN CHRISTIAN DENNERT. (L.S.)
GEORGE GUSTAVE LIND.
(L.S.)