IMPROVEMENTS IN THE CONSTRUCTION OF HYDRAULIC PUMPS
Year: 1859

page_text: LETTERS PATENT to Marc Antoine François Mennons, of the British
and Foreign Patent Offices, 39, Rue de l'Echiquier, Paris, in the Empire
of France, for the Invention of "IMPROVEMENTS IN THE CONSTRUCTION
OF HYDRAULIC PUMPS."-A communication from Louis Laurent Bequemie,
residing in Paris.
COMPLETE SPECIFICATION filed by the said Marc Antoine François
Mennons at the Office of the Commissioners of Patents, with his Petition.
and Declaration, on the 12th September 1859, pursuant to the 9th
Section of the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, MARC
ANTOINE FRANÇOIS MENNONS, of the British and Foreign Patent Offices,
39, Rue de l'Echiquier, Paris, in the Empire of France, send greeting.
WHEREAS I am in possession of an Invention for "IMPROVEMENTS IN
THE CONSTRUCTION OF HYDRAULIC PUMPS," (communicated to me by Mr. Louis
Laurent Bequemie, of Paris,) and have petitioned Her Majesty to grant unto
me, my executors, administrators, and assigns, Her Royal Letters Patent for
the same, and have made solemn declaration that it is a communication.
NOW KNOW YE, that I, the said Marc Antoine Francois Mennons,
do hereby declare that the following Complete Specification, under my hand
and seal, fully describes the nature of the Invention, and the manner in

page_text: which the same is to be performed, reference being had to the accompanying
Drawing, and to the letters marked thereon, that is to say :-
The main object of the Invention communicated to me is the formation of
an air reservoir in the upper part of hydraulic pump bodies by means of which
arrangement a double compression is obtained, and a continuous jet produced.
The accompanying Drawing represents an engine or pump constructed on
this system, it being premised that the same principle may be applied to the
construction of all the known apparatus of a similar nature. A, A, lower part
of the engine with its valve a, a; B, B, upper part or dome provided in the
middle with a pipe or tube b, b, one extremity of which opens in the piston or
plunger while the other gives egress to the water at the side of the dome by
the hose, and joint piece C; D, vertical rod fixed to the lower part or valve
plate of the plunger or piston. This rod passes through the tube b, b, and
the stuffing box G, G, above which it joins the working lever in E; F, F,
plunger or piston in the form of a hollow cylinder in copper or other suitable
metal or material, and provided at its base with a plate in which is fitted a
valve ff, opening upwards. This plunging cylinder is surrounded either
entirely or in section by a packing of any suitable matter as in g, g. The
upper and lower parts A, A, and B, B, of the engine shewn in the Drawing
are each cast in one piece hermetically joined in the centre as in H, H, but
if so required, the whole body may be in one casting opening at the base.
On working the engine thus constructed, the upward stroke of the piston
or plunger F, F, opens the entry valve a, a, and admits the water into the
lower part of the body A. The downward stroke, which succeeds opens
the valve f, f, through which the water passes to the interior of the plunger
F, F. The water on reaching the level of the tube b, b, effectually intercepts
the air contained in the upper part or dome of the engine body (B, B,) and
the compression thus established increasing at each stroke of the lever, a
counter-action is produced, which maintains a continuous jet during the
working of the apparatus. As above noted the arrangement described may-
be adopted in the construction of all the known systems of hydraulic pumps,
the result being a considerable increase of power with a material economy in
the weight, volume, and expense of working.
Having thus described the nature of the said improvements, and the manner
of carrying them into effect, I would have it understood that I do not limit
myself to the precise details laid down, but reserve the right of modifying
them within the principle which forms the base of the Invention, but what
I claim is the construction and arrangement substantially, as above described

page_text: and represented in the Drawing of an air reservoir or recipient in the body
of hydraulic pumps by means of which arrangement a secondary or counter
compression is produced, and a continuous jet obtained with the lowest
possible expenditure of motive power.
In witness whereof, I, the said Marc Antoine François Mennons, have
hereto set my hand and seal, this Tenth day of Septembre, in the
of our Lord One thousand eight hundred and fifty-nine.
year
M. F. MENNONS. (L.S.)