Improvements in Propellers for Ships or Vessels.
Year: 1893

page_text: Date of Application, 13th Jan., 1893
Complete Specification Left, 1st Sept., 1893—Accented. 21st Oct., 1893
PROVISIONAL SPECIFICATION.
Improvements in Propellers for Ships or Vessels.
I LORENZO JULIA Y PUIG, of 88 Malecon Street, Guayaquil, Province of
El Guayas, Ecuador, South America, Merchant do hereby declare the nature of
this invention to be as follows:--
My invention relates to a propeller which may be located almost entirely within
the hull of a vessel, thus rendering it readily accessible if repairs are needed.
The propeller is adapted to propel a vessel by displacement of the water at the
stern thereof caused by the reciprocating motion of the propeller which is in the
form of a cylindrical plunger having the same weight as the water to be displaced,
thus requiring applied power to drive it in one direction only, it being returned by
the action of the water.
The propeller is made hollow to obtain the greatest sectional area with the least
weight. Two such propellers would ordinarily be used one at each side of the
keel within the vessel's hold at the stern, each propeller being adapted to reciprocate
through a stuffing box in the counter of the vessel so placed at each side of the
rudder that when the propellers are forced outwards they will not in any way
interfere with the action of the rudder. The propellers are driven direct by
single acting engines, the piston head and the propeller being directly connected.
In operation when the steam is admitted into the rear end of the cylinder the
piston is forced outwards the propeller which is connected therewith being carried
outward from its casing beyond the stern of the vessel, the outward thrust of the
propeller and its impact upon the water serving to force the vessel ahead, while
owing to the fact that the propeller is of the same weight as the water to be
displaced, and the steam being discharged from the cylinder, the water will force
the propeller to travel back within its casing until the piston reaches a point
where it is again to be acted upon. Stay bars or plates are placed around the
outer edges of the openings through which the propellers move in order to strengthen
them; and face plates may also be employed for the same purpose. The length
of stroke of the piston will be calculated with relation to the displacement of the
boat and the motive power employed.
Dated this 13th day of January 1893.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Chartered Patent Agents.
COMPLETE SPECIFICATION.
Improvements in Propellers for Ships or Vessels.
I LORENZO JULIA Y PUIG, of 88 Malecon Street, Guayaquil, Province of
El Guayas, Ecuador, South America, Merchant 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 propellers for ships or vessels and it has for its object
to provide a propeller which may be located almost entirely within the hull of a
vessel, thus rendering it readily accessible if repairs are needed. The propeller
is adapted to propel a vessel by displacement of the water at the stern thereof;
caused by the reciprocating motion of the propeller which is in the form of a
cylindrical plunger having the same weight as the water to he displaced, thus
requiring applied power to drive it in the outward direction only, it being
ID 1

page_text: returned by the action of the water, whereby great economy in applied power is
obtained.
The invention consists in the novel construction and combination of the several
parts, as will be hereinafter fully set forth and pointed out in the claims.
Reference is to be had to the accompanying drawings forming a part of this
Specification, in which similar letters of reference indicate corresponding parts in
all the figures.
Figure 1 is a partial side elevation of a vessel's hull, a portion being broken away
illustrating the improved propeller applied and in longitudinal section, the propeller
being at the end of its outward stroke;
Figure 2 is a similar view, except that the propeller is in side elevation and at
the end of its inward stroke; and
Figure 3 is a view of the stern of a vessel's hull fitted to receive the improved
propeller.
Two propellers A would ordinarily be employed, preferably placed one at each
side of the keel within the vessel's hold and at the stern. The propeller is of
cylindrical construction and is made hollow, as shown in Figures 1 and 2 in order
that the greatest possible diametrical area may be obtained with the least possible
weight. Each propeller is adapted to work through an opening made in the
counter of the vessel, and provided with a stuffing box B, the openings being so
placed at each side of the rudder C, that when the propellers are forced outward,
they will not in any way interfere with the action of the rudder. In front of each
stuffing box B a cylinder D is supported within the vessel's hull, the cylinders being
of any desired size, and in each cylinder slides a piston D', the piston and the
propeller being directly connected by a rod d, or its equivalent. The length of
each cylinder and the length of its piston rod is preferably substantially the same,
and the distance between the outer ends of the cylinders and the outer edges of the
openings surrounded by the stuffing boxes B, is approximately of the same length
as that of the propeller.
Steam is employed to move the piston and is admitted only in front of the same,
in any well-known manner.
In operation, when steam is admitted to the rear end of the cylinder the piston
is forced outward and the propeller connected therewith is carried outward from
its casing beyond the stern of the vessel, as shown in Figure 1, the outward thrust
of the propeller and its impact upon the water serving to force the vessel ahead,
while owing to the fact that the propeller is of the same weight as the water to
be displaced, and the steam being discharged from the cylinder D, the water will
force the propeller to travel back within its casing until the piston reaches a point
where it is again to be acted upon by the steam. Thus it will be observed that
the steam is used only to force the propeller outward, the water upon which the
propeller acts serving to properly return the propeller.
Stay plates or bars E and E', are placed around the outer edges of the openings
through which the propellers work, as shown in Figure 3, in order to strengthen
them; and face plates may also be employed for the same purpose. It will be
observed that all of the propelling mechanism is located within the hull, and is
therefore readily accessible in the event that repairs are needed. The length of
stroke of the piston will be calculated with relation to the displacement of the
vessel and the motive power employed.
A propeller constructed as above described is not only simple, durable and
effective, but it is likewise economic in its construction and provides for economy
of steam, while the action of the propeller is powerful and direct.
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. A cylindrical propeller of a weight equal to that of the water it is intended:
to displace, as and for the purpose specified.

page_text: 2. A propeller consisting of a hollow body of cylindrical form adapted to be
forced to a contact with a body of water, as and for the purpose set forth.
3. In a propelling mechanism for vessels, the combination, with the hull having
an opening in its stern, of a propeller consisting of a cylindrical body of a weight
essentially equal to the weight of water it is intended to displace, and supported
to slide in the said opening, and a driving mechanism applied to the propeller
upon its outward stroke only, the water serving to return it, substantially as shown
and described.
4. In a propelling mechanism for vessels, the combination, with the hull provided
with an opening in its stern, and a propeller consisting of a hollow cylinder of a
weight equal to the weight of the water it is intended to displace, and supported
to slide in said opening, of a steam cylinder, the piston of which is connected
with the propeller, steam being admitted at the front of the piston only, whereby
power is applied to force the propeller outward into the water to propel the vessel,
and the water upon which it acts serving to return the propeller within the hull,
substantially as described.
Dated this 31st day of August 1893.
L. J. Y PUIG,
By A. M. & Wm. Clark,
53, Chancery Lane, London, Chartered Patent Agents.