Jury Shafts for Propellers.
Year: 1891

page_text: Date of Application, 12th Jan., 1891
Complete Specification Left, 2nd Oct., 1891-Accepted, 14th Nov., 1891
PROVISIONAL SPECIFICATION.
Jury Shafts for Propellers.
I, THOMAS POST COOPER HALSEY, of No. 243 Fourth Street, Jersey City,
in the State of New Jersey, United States of America, Sea Captain, do hereby
declare the nature of this invention to be as follows :-
In sea going vessels the propeller shaft is usually of considerable length and it
is liable to become broken between the bearings, and the safety of the vessel is
often endangered because the vessel cannot be made to obey the helm.
In my present invention I fit into the vessel a jury shaft, parallel or nearly so
with the propeller shaft and I provide upon the propeller shaft as near to the
propeller as convenient a gear wheel and upon the jury shaft a pinion out of gear
with the gear on the propeller shaft in its normal condition, but such pinion may
be brought into gear if the propeller shaft is broken, and adjacent to the engine
a suitable means is provided for connecting the jury shaft to the engine if the
propeller shaft becomes broken. A convenient device for making this connection
is a gear wheel adjacent to the crank of the propeller shaft and another pinion upon
the jury shaft, but to provide for breakage in the crank of the propeller shaft, it is
advantageous to apply a crank upon the end of the jury shaft and a movable
connection to the cross head of the engine.
The jury shaft and parts connected with it may be comparatively light, as the
gearing gives such shaft a leverage against the propeller, and usually in case of the
propeller shaft breaking, it is preferable to drive the propeller at a slower speed to.
lessen the risk of further injury.
Dated 19th day of January 1891
T. P. C. HALSEY.
By Brewer & Son,
33, Chancery Lane, Agents.
COMPLETE SPECIFICATION.
Jury Shafts for Propellers.
I, THOMAS POST COOPER HALSEY, of No. 243 Fourth Street, Jersey City in
the State of New Jersey, United States of America, Sea Captain, 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 :-
In sea going vessels the propeller shaft is usually of considerable length and it
is liable to become broken between the bearings, and the safety of the vessel is
often endangered because the vessel cannot be made to obey the helm.
In my present invention I fit into the vessel a jury shaft parallel or nearly so..
with the propeller shaft and I provide upon the propeller shaft as near to the
propeller as convenient, a gear wheel, and upon the jury shaft a pinion out of gear
with the gear on the propeller shaft in its normal condition, but such pinion may
be brought into gear if the propeller shaft is broken, and adjacent to the engine
a suitable means is provided for connecting the jury shaft to the engine if the
propeller shaft becomes broken. A convenient device for making this connection
is a gear wheel adjacent to the crank of the propeller shaft and another pinion
upon the jury shaft, but to provide for breakage in the crank of the propeller shaft
it is advantageous to apply a crank upon the end of the jury shaft and a movable
connection to the cross head of the engine.
The jury shaft and parts connected with it may be comparatively light as the
gearing gives such shaft a leverage against the propeller, and usually in case of the

page_text: propeller shaft breaking it is preferable to drive the propeller at a slower speed to
lessen the risk of further injury.
In the drawings,
Fig. 1 is a longitudinal section of a portion of a vessel representing my improve-
ment diagrammatically, and
Fig. 2 is an elevation illustrating a connection that may be made from the engine
to the jury shaft.
The propeller A is of any desired character, and the shaft B of the same extends
to the engine C. I have illustrated the engine as direct-acting, with the cylinder
over the crank. The bearings for the propeller shaft are to be placed in suitable
positions. I have represented bearings at D, E, F, G, and I have shown a jury
shaft H supported in suitable bearings and parallel to the shaft B, and this jury
shaft H will be much smaller than the propeller shaft B in consequence of providing
upon the propeller shaft B a gear wheel K of as large diameter as consistent with
the space into which it is to be introduced, and a pinion L upon the shaft H of smaller
diameter. Hence there is a leverage of the shaft H and pinion L in criving the
propeller whenever the pinion L is in gear with the wheel K and the power is
communicated through the shaft H. It is now to be understood that this pinion L
can be slipped endwise upon the shaft H or with the shaft, so as to bring this
pinion into action with the gear wheel K whenever necessary so to do in consequence
of breakage in the propeller shaft R. The connections between the jury shaft H
and the engine C may vary according to the character of the engine.
I have represented a gear wheel M upon the propeller shaft B adjacent to the
crank N and a pinion P upon the shaft H, that can be brought into gear with the
wheel M when the jury shaft H is employed. In this instance the relative sizes of
the pinion P and wheel M should be adapted to running the engine at a slower
speed than usual to lessen the risk of further injury. It will, however, be apparent
that in case of breakage in the crank N or its pin or in case the propeller shaft
breaks at the crank N the wheel M will not be available, and in that instance it is
preferable to provide upon the cross head Q of the engine a wrist-pin and connecting
rod S to a crank R upon the jury shaft H, so that such jury shaft H may be
revolved directly from the cross head of the engine. The details of construction
in these cases, however, will vary according to the character of the engine and the
location of the respective parts.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :
First. The combination, with the propeller shaft and propeller, of the jury shaft
extending from near the propeller to the engine, parallel, or nearly so, with the
propeller shaft, and movable gearing for connecting the jury shaft and the propeller
shaft, and a movable connection between the jury shaft and the engine, substantially
as set forth.
Second. The combination, with the propeller shaft and propeller, of a gear wheel
upon the propeller shaft near the propeller, a jury shaft extending from near the
propeller to near the engine, a movable pinion to connect the jury shaft and the
gear wheel, and movable connections between the jury shaft and the engine,
substantially as set forth.
Third. The combination, with the propeller shaft and propeller, of a jury shaft,
a gear wheel on the propeller shaft near the propeller, and a gear wheel near to and
connected with the crank of the engine, and a movable pinion upon the jury shaft
to connect with such gear wheel adjacent to the crank, substantially as set forth.
Dated this 2nd day of October 1891
T. P. C. HALSEY.
By Brewer & Son,
Agents for the Applicant.