Year: 1897

page_text: I, EMILE TEXIER, of Fouras, Charente Inferieure, France, Carpenter, do hereby
declare the nature of this invention to be as follows:-
The screw-propellers actually in use are cast in a single piece, which has the
serious disadvantage that in the event of one of the blades breaking, the ship has
to be hove-to until the damaged screw is replaced, and consequently much delay
is occasioned, to say nothing of the danger.
The present invention has for its object a screw-propeller, in which the blades
are cast separately and united to the central piece, keyed on the drive shaft, by
clamping and rivetting in a suitable manner so that, in case of a rupture, tho
broken or injured blade may be replaced, with little expense and hardly any
delay.
The contacting surfaces of the blade and of the centrul piece may be either
plane or else furnished with dove-tails snugly fitting and rivetted together.
This screw-propeller is in no way inferior as regards solidity, to the screws that
are cast all of a piece and it is preferable to thein, if we take into consideration
the rapidity with which a broken blade can be replaced at a trifling cost.
Dated this 1st day of February 1897
L. DUVINAGE,
Agent for Applicant.
I, EMILE TEXIER, of Fouras, Charente Inferieure, France, Carpenter, do hereby
declare the nature of this invention, and in what manner the same is to be per-
formed to be particularly described and ascertained in and by the following
statement:-
The screw-propellers actually in use are cast in a single pieco, which has the
serious disadvantage that in the event of one of the blades breaking, the ship has
to be hove-to until the damaged screw is replaced, and consequently much delay
is occasioned, to say nothing of the danger.
The present invention has for its object a screw propeller, in which the blades
are cast separately and united to the central piece, koyed on tho drive shaft, by
clumping and rivetting in a suitable manner, so that in case of a rupture, the
broken or injured blade may be replaced, with little expense and hardly any
delay.

page_text: In the accompanying drawing,
Fig. 1 is a view in elevation of a screw blade showing the connection of the same
to the projection upon the boss which latter is shown in a perspective longitudinal
section.
Fig. 2 is a similar view showing a modification of the connection.
Fig. 3 is a reversed view of Fig. 1.
Fig. 4 is a transverse section on line A-B of Fig. 1 and Fig. 5 is a transverse
section on line C-D) of Fig. 2.
The blades a of my screw are cast separately and united to the projections b
of the boss, by means of scrows d.
The contacting surfaces of the blades a and of the projections & are either flat,
Figs. 1 and 4 or provided with dove-tailed longitudinal tenons e, Fig. 2 and 5,
snugly fitting in one another by sliding the branches on the projections b.
The rear edge of the blades engages in a groove made in the boss to obtain
a firmer connection between the blades and the projections.
The screws may be provided with a suitable locking device such as nuts 9,
Fig. 1, locked by means of small pins g¹, or the point of the screw may be provided
with a hole through which passes a spring pin h, Fig. 2.
Square pins or rods may be fitted into the blades and projections to increase the
rigidity of the connection."
This screw-propeller is in no way inferior, as regards solidity, to the screws
that are cast all of a piece and it is preferable to them, if we take into consideration
the rapidity with which a broken blade can be replaced at a trifling cost.
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 screw-propeller with movable blades, distinguished by its blades being cust
separately and joined to projections upon the boss either by flat or morticed cou-
tacting surfaces and rigidly screwed or rivetted together substantially as described
and shown.
2. A screw propeller with movable blades substantially as described and shown.