Improvements in and relating to Hoisting and Lifting Machines.
Year: 1889

page_text: Date of Application, 10th Oct., 1889
Complete Specification Left, 10th July, 1890-Accepted, 16th Aug.,
1890
PROVISIONAL SPECIFICATION.
Improvements in and relating to Hoisting and Lifting Machines.
JOHN HARRISON of No. 9 Wharf Terrace, Stamford in the County of Lincoln
Engineer do hereby declare the nature of this invention to be as follows:-
My invention relates to a new and improved method for obtaining leverage, by
toothed gearing which is so constructed, and arranged that the load raised is held, or
locked in any position; and also to throwing the apparatus out of gear; and applying
the power direct by the same handle or driver which is used to actuate my invention.
The invention can be applied to a windlass, rack pinion; or screw but to facilitate
and simplify my description, I will described it as applied to a windlass, or barrel upon
which a chain, or rope is wound to raise, or move the load which will be ample, and
sufficient, to show the nature of my invention.
My invention consists of two spur wheels having the same centre and mounted side
by side, one being fixed, or clutched to the frame (when the winding barrel is mounted
to revolve upon a fixed axle or stud this wheel is clutched or keyed to the axle) and
the other to the winding barrel.
The spur wheel which is fixed to the winding barrel has one or more teeth more
than the one fixed or clutched to the frame upon which the winding barrel is
mounted.
These two spur-wheels gear into two spur pinions, or wheels which are held or cast
together, and may have the same number of teeth (the pitch being made to suit) or
may vary in the number of teeth in each pinion to suit the wheels into which they
gear, and to give the required leverage.
The two spur wheels or pinions are carried round the spur wheels upon a stud, upon
which they are free to turn. The stud is fixed into a crank arm mounted to revolve
upon the same centre as the winding barrel. This crank arm may also form the crank
handle by which the machine is put in motion.
The amount of leverage may be varied be the diference in the size and number of
teeth in the wheels. The holding or locking action is obtained by making the wheel
which is fixed upon the winding barrel with a greater number of teeth, than the
wheel fixed or clutched to the frame.
This causes the barrel (upon which the rope or chain is wound) to rotate in the
same direction as the crank handle, or driver; and therefore the load and the wheel
fixed or clutched to the frame have a tendency to rotate the two pinions in contrary
directions and thus hold or lock the load.
The apparatus can be thrown out of gear by providing the fixed wheel with a
suitable clutch or catch to release it from the frame and allow it to revolve; or the
two pinions which rotate round the spur wheels may be lifted, or slided out of gear.
The crank handle may be provided with a clutch or catch to fix it to the winding
barrel and thus apply the power direct.
3000
COMPLETE SPECIFICATION.
Improvements in and relating to Hoisting and Lifting Machines.
JOHN HARRISON of Wharf Road Stamford in the County of Lincoln, Engineer
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 a new and improved method for obtaining leverage by

page_text: toothed gearing which is so constructed and arranged that the load raised, or lifted, is
held in any position.
My invention can be applied to a windlass barrel, rack pinion or screw and can be
actuated by hand, steam, or other power but to facilitate and simplify my description
I will describe my invention with reference to the accompanying drawing as applied
to a windlass barrel which will be ample and sufficient to enable any practical person
to understand how my invention can be applied to all kinds of lifting, and hoisting
machinery whether worked by manual or other power.
In the accompanying drawings I have shown my invention applied direct to the
winding barrel; but it will be understood that the invention is applicable to any
motion shaft other than direct; when more convenient, and when different
leverages are required ordinary wheel gear may be used in combination with my
invention.

page_text: apparatus is applied, as shown and described with reference to the accompanying
drawings.
4. The combination and application of toothed wheels as described and shown with
reference to figures 1, 2, 3, and 4 of the accompanying drawings and any mere
modifications of the same.
5. The various modifications of my invention as shown and described with reference
to figures, 5, 6, 7, and 8 of the accompanying drawings.
1000
J. HARRISON.