Improvements in Devices for Protecting the Propellers of Steam Ships and other Vessels.
Year: 1899

page_text: Date of Application, 20th Oct., 1833-Accepted, 20th Jan., 1900
COMPLETE SPECIFICATION.
Improvements in Devices for Protecting the Propellers of Steam Ships
and other Vessels.
I, FREDERICK HACKING, Stone Mason, of 157, Cordova Street E., Vancouver,
County of New Westminster, Province of British Columbia, Canada, 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:-
This invention relates to devices for protecting the propellers of steam ships
and other vessels, and its object is to provide a device which will protect the
propeller of steam ships from injury. A further object is to provide a protector
for propellers which will also tend to increase the speed of the ships. A further
object is to provide a device of this character which is simple in construction,
effective in operation and which may be manufactured at a moderate cost.
To these ends, the invention consists in a protector for propellers, constructed
substantially as herein illustrated and described and defined in the appended
claims.
Referring to the drawings, in which similar letters of reference indicate
similar parts,
Figure 1 is a view in elevation of the stern of a single propeller steam-ship
provided with a protector, constructed in accordance with this invention.
Figure 2 is a side view thereof.
Figure 3 is a side view of the protector detached.
In the drawings, (A) represents a steam-ship of any usual or preferred kind
and (A) the propeller which may also be of any usual or preferred form, and is
secured to the shaft (a).
The protector is constructed in the form of a cylinder (B) of steel or other
suitable material, which is secured to the top and bottom frames of the propeller
compartment, preferably by rivetting. The interior of the cylinder (B) is a
perfect circle and encloses the propeller (A¹) on all sides, thus preventing injury
thereto by accidental contact with obstructions.
The diameter of the cylinder (B) is considerably larger than the diameter of
the propeller and is open at both ends, so as to permit the free passage of the
water. The cylinder is bevelled slightly from the top to the bottom at its front
and rear faces, forming the inclined sides (b) and (b).
The cylinder not only serves to protect the propeller from injury, but also acts
to present a solid column of water to the propeller blades and maintain an equal
pressure on all sides of the propeller blades thus utilizing all the power of the
propeller and increasing its effectiveness and hence the speed of the ship.
The protector can readily be used in connection with side propellers by
securing it over the propeller by means of suitable arms.
While I have herein shown a preferred form of carrying my invention into
effect, yet I do not desire to limit myself to such preferred details of construc-
tion, but claim the right to use any and all modifications thereof which will
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page_text: serve to carry into effect the objects to be attained by this invention in so far
as such modifications and changes may fall within the spirit and scope of my
said invention.
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 protector for propellers, constructed and operating substantially as
herein illustrated and described.
2. A protector for propellers, comprising a metal cylinder, having open ends
and enclosing the propeller, substantially as described.
3. The combination with a vessel having a propeller of a cylinder secured
thereto, enclosing the said propeller, the said cylinder having open ends which
are downwardly inclined, substantially as described.
Dated this 20th day of October 1899.
HERBERT HADDAN & Co.,
Agents to the Applicant,
18, Buckingham Street, Strand, London, W.C.