An Improved Bilge-pump.
Year: 1893

page_text: Date of Application, 18th May, 1893
Complete Specification Left, 16th Feb., 1894 Accepted, 17th Mar., 1894
An Improved Bilge-pump.
I, PAUL JULES CÉSAR DELEGRANGE, of 8, Rue Fouquet, Douai, in the
Republic of France, Shipowner, do hereby declare the nature of this invention
to be as follows:-
My invention relates to a bilge-pump for boats and vessels adapted to discharge
directly from the bilge into the water outside the vessel, that is to say below the
surface of the water.
This pump is constructed of a pump body in which works a piston provided with
two leathers rendered perfectly tight. The suction valve is of rubber and is lifted
during the suction and hermetically closed, while the outlet valve opens under
the pressure caused by the descent of the piston.
The pump is advantageously placed on the floor of the ship's hold with its outlet
valve in an aperture in the ship's side at or near the level thereof, nevertheless the
outlet valve may be placed in a higher position, according to the shape of the boat
or vessel, or according to other circumstances.
By my invention I avoid raising the water from the bilge to the deck in order to
discharge it outside the vessel, by forcing it out below the surface of the sea or
river in such a manner that whatever may be the depth of immersion consequent
upon the load of the vessel the only resistance to be overcome will be that
corresponding to the height of the column of water from the suction point to the
water's surface.
I thus effect a great economy in the amount of force expended over pumps of
ordinary construction which draw water from the bilge to the deck and then
discharge it above the level of the sea or river, so that with the same power and
the same stroke a pump of much larger diameter can be employed and a much
greater amount of work be performed in a given time.
Dated the 18th day of May 1893.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improved Bilge-pump.
I, PAUL JULES CÉSAR DELEGRANGE, of Douai, in the Republic of France,
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 relates to an improved bilge-pump which obviates the necessity
of pumping the water from the hold of ships onto the deck thereof in order to
discharge the same.
And in order that my invention may be more fully understood I have caused to
be appended hereunto one sheet of drawings showing a section of a portion of a
ship with my improved bilge pump applied.
In carrying out my invention my improved bilge pump consists of a body A in
which moves a piston B. The latter consists of two leather discs fitting perfectly
watertight. The inlet C is grid like and forms a seat for a rubber valve adapted

page_text: to lift during the outstroke of the piston B and to close hermetically during the
instroke when the outlet D opens under the pressure produced by the piston. The
outlet D may be placed higher than shown in the drawing in accordance with
the shape of the ship, or as may be deemed suitable.
My invention has for its advantage to be able to discharge water from the hold 5
of the ship below the external water level, whatever may be the draft of the ship
in accordance to the various loads.
The pump described also requires less power than those heretofore in use owing
to it not having to raise the water from the hold to the deck of the ships.
It will be understood that a great number of existing types of pumps may be 1
adapted for my invention.
Having now particularly described and ascertained the nature of my inven-
tion and in what manner the same is to be performed, I declare that what [
claim, is-
A bilge-pump adapted to discharge the water from the hold of ships directly
into the water in which it floats, below the water line, substantially as set forth.
Dated this 15th day of February 1894.
F. BOSSHARDT & Co.,
4, Corporation Street, Manchester, Agents to Applicant.
F. BOSSHARDT & Co.,
4, Corporation Street, Manchester, Agents to Applicant.