SELF ADJUSTING PULLEYS AND WHEELS
Year: 1884

page_text: I JOHN TENWICK Loam Moulder Spittlegate Grantham Lincolnshire do hereby
declare the nature of my Invention for SELF ADJUSTING PULLEYS AND WHEELS
to be as follows:-
I make my pulleys and wheels in preference of any description of metal or
material suitable to the work they have to perform and the boss of pulley or wheel
is the receptacle of a ball or sphere through which I make in preference a square
hole or any other form of hole that will keep the ball in its proper position for the
pulley or wheel to revolve on when required in performing its work. The boss or
nave of the pulleys or wheels are made in several parts and bolted or otherwise
secured to body of wheel or pulley. The pulley or wheel works loose on the ball
and is held in proper position by suitable springs as shewn in accompanying
drawing. These springs work loose on axle or shaft and are regulated by two
screwed nuts on axle or shaft in accordance to the resistance they have to sustain.
The object I attain by my Invention is to lessen friction with tram wheels in
working around and on short curves And with pulleys it prevents the grinding of
the wire rope and flange of pulley as the springs allow the wheels to adjust
themselves to curves and the pulleys to the angle from which the strain comes.
Dated this 19th day of February 1884

page_text: .
I JOHN TENWICK of Spittlegate Grantham in the county of Lincoln, Loam
Moulder do hereby declare the nature of my invention for IMPROVEMENTS IN
SELF ADJUSTING PULLEYS AND WHEELS and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement :-
I construct my pulleys and wheels in preferance of metal. Figure 1 shows
elevation of wheel to be used on tram or railroads, is made in several parts Parts
as shown in figures 3. 4. 5. the boss or nave of pulley and wheel is the receipticle
of a ball or bush with with spherical ends which allows the pulley or wheel to bave
the same play as when the ball is used such bush being required when the boss or 1
nave is longer than ordanary, or when wheels are very large in diameter, as it
steadys the wheel when at work as shown at letter K and figures 3 4 5 in the
annexed sheet of drawings. Which clearly define the nature of my invention and
how the same is to be carried out. On ball and bush with spherical ends I make a
flange P as shown at figures 3. 4. 5. and on each side of flange I place a flexable 1
packing of india rubber or gutta percha or other suitable materiael as shown at
letter O in figures 3. 4. 5. figure 6 and letter R represent plan of cap which forms
part of boss or nave of wheel figure 2. And letter K. Plan of ball figure 3. section
of bush figure 4 and letters M K represent Section of wheel and ball letter N Steel
pin for securing ball to axle or Shaft letter S screw bolts for securing cap R to 2
body of wheel In making my pulleys and wheels as herein described I greatly
reduce the friction when the wheel is run on a curve as the flexable packing gives
sufficient play to the wheel to prevent the grinding of flange of Wheel and rail and
in my pulley it prevents the grinding of rope or chain and flange of pulley as it
readily adjusts itself to the possition from which the strain comes at figures 7. 8. 2
9. 10. I show how the same results can be obtained without the flange on ball.
figure 7 elevation of pulley figure 8 Section C D figure 9. elevation of Shaft.
figure 10 section of ball. letters L body of pulley letter H Part of boss. letter G
moveable Part of boss. letter E hollow screwed nut and receipticle of spiral
Spring F letters K I ball and Shaft: letter K. ball.
:
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a
Having now described the nature of my said invention and in what manner the
same is to be performed I declare that I claim. (In the mounting of Pulleys and
wheels, a Sphere or bush with Hemisphericle Ends fixed rigidly on the Shaft or
axle, upon which the Pulley or Wheel revolves the latter being kept in possition by
stops, which however allow a slight latteral inclination substantcially as and for the 3
purposes hereinbefore Specified.
Dated this 10th 1
1004