Improvements in or relating to the Propulsion and Steering of Boats.
Year: 1897

page_text: Date of Application, 4th Oct., 1897-Accepted, 13th Nov., 1897
COMPLETE SPECIFICATION.
Improvements in or relating to the Propulsion and Steering of Boats.
I, PAUL GUSTAV KRETSCHMAR, Doctor of Law, of 12 Carlstrasse Leipzig in the
Empire of Germany, 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 a screw or paddle wheel propelled boat driven by
means of a pedal mechanism.
The constuction and method of operation of the working parts will be under-
stood by help of the annexed drawing in which:-Fig. 1 is a longitudinal section.
Fig. 2 a cross section and Fig. 3 a plan of the screw propelled boat. Fig. 4 a
longitudinal section. Fig. 5 a cross section and Fig. 6 a plan of the paddle
wheel propelled boat.
'
The boat may be of different size and shape according to its purpose and it is
provided with a raised saddle like seat A fastened in a suitable foot bearing.
The mechanism for driving the screw propeller comprises a pedal crank axle a
carried in suitable ball bearings and provided with the pedals 7 p. On the pedal
crank axle is the driving wheel t which meshes with a pinion on the propeller
shaft w. The wheels t t are bevelled toothed wheels and the proportion between
their diameters may be varied according to the construction and form of the boat.
The propeller shaft is surrounded by a casing m and carried by ball bearings k k¹.
It is set in revolution by means of the pedals p p and wheels t t.
Instead of the screw propeller paddle wheels may be used as in Figs. 4, 5 and 6.
The mechanism is then simplified in so far that the wheels t t the casing m the
axle w and screw S are omitted, while the axle a carries the paddle wheels T¹ T2
and is also made as a double cranked axle, the pedals being carried by the
cranked parts. By having this double cranked axle and also the aforesaid
gear the boat may be propelled by both paddle wheels and screw propeller.
For steering the boat, there is in front of the seat the steering wheel R with
it shaft f, the latter being journalled in a suitable frame T on the bottom of the
boat. On the shaft f is the steering chain pulley drum or wheel s. The rudder B
carries the double lever d to the arms of which the steering chain is fastened.
The construction of the remainder of the boat may vary, and several pedal pairs.
with corresponding pedal crank axles may be fitted and connected together by
wheels and shafts or by chain gearing for the purpose of driving the boat.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is:
1. A screw propelled boat in which the screw propelled shaft m is driven by the
pedal crank apparatus a p p¹ and the wheels t t¹, a steering wheel R being provided
in front of the seat A.
2. The modification of the said boat in which the pedal crank shaft a is formed

page_text: as a double cranked shaft and carries the paddle wheels T T2 so that the said boat
may be driven by both paddle wheels and screw propeller, or by omitting the gear
for driving the latter by paddle wheels alone.
Dated this 4th day of October 1897.
HERBERT HADDAN & Co.,
18, Buckingham Street, Strand, London, Agents to
Applicant.