Improvements in Means for Revolving Shafts or Spindles at Varying Speeds.
Year: 1891

page_text: Date of Application, 11th Feb., 1891
Complete Specification Left, 11th Nov., 1891-Accepted, 12th Dec., 1891
PROVISIONAL SPECIFICATION.
Improvements in Means for Revolving Shafts or Spindles at
Varying Speeds.
I THOMAS JOHNSON of 39 Freehold Terrace Burslem in the County of
Stafford Engineer do hereby declare the nature of this invention to be as
follows:-
My present invention relates to means for revolving shafts or spindles at varying
speeds for which purpose I arrange on each shaft a spindle which is required to be
revolved two discs each of which is in cross section somewhat of the shape of an
ordinary saucer. Each said disc is formed with a boss through which passes the
spindle and where said shaft or spindle is circular in cross section a suitable
key may be either secured to the shaft or to the boss of each disc.
shaft or
The said discs are arranged on the shaft or spindle so that their faces press one
towards the other and for this purpose I place a spiral or other suitable spring
between a fixed collar and the boss of each said disc.
Where the shaft or spindle works vertically one disc may be fixed to the shaft or
spindle and the opposite disc may be free to slide on a key or arranged with a fixed
key to slide in a key way and may be suitably weighted or pressed down towards
the other disc by means of a spring.
A suitable rope or band which is driven by a pulley or pullies in any ordinary
manner is arranged so that as it runs it may be pressed between the faces of the
two saucer shaped discs thus revolving the shaft or spindle and in order to vary the
speed thereof it will be obvious that the said rope may be forced between the faces
and as it is forced nearer the centre the speed will increase and as it is withdrawn
to near the outer peripheries of the discs the speed will decrease. As the rope or
band is pressed between the discs the springs or weights allow the disc or discs to
give and the rope or band is thus gripped between the faces thereof.
The said rope or band may be pressed between the faces of said discs by means of
suitable guide pullies or runners operated by a hand or foot lever or a hand or foot
wheel and screw.
D
... 01 JC 1901
H. F. BOUGHTON, M.I. Mech. E.,
London, Sheffield, and Barnsley, Agent.
COMPLETE SPECIFICATION.
Improvements in Means for Revolving Shafts or Spindles at
Varying Speeds.
I THOMAS JOHNSON of 39 Freehold Terrace Burslem in the County of Stafford
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 present invention relates to means for revolving shafts or spindles at varying
speeds for which purpose I arrange the mechanical means substantially as set forth
in the accompanying sheet of drawings in which
Fig. 1 is an elevation and Fig. 2 a plan of my said improvements.
Fig. 3 is a plan illustrating a modified arrangement for conducting the driving
rope or band and
Figs. 4 and 5 are elevations of modifications of my improvements aforesaid.
Like letters of reference denote corresponding parts in each view.

page_text: In order to revolve the shaft or spindle A. I arrange thereon two discs B each of
which is in cross section somewhat after the shape of an ordinary domestic saucer.
Each disc B is formed with a boss b¹ through which passes the shaft or spindle A
having a suitable key C which may be either secured to the shaft A or a keyway
may be formed in the shaft A and a key fixed to each boss of the discs B.
The discs B are arranged on the shaft or spindle A so that their faces a¹ press
one towards the other and for this purpose I place a spiral or other like spring D
between the fixed collars E and the boss b' of each disc B.
Where the shaft or spindle A works in a vertical position as shown at Figs. 4
and 5 the lower disc B may be fixed to the shaft or spindle A and the upper disc B
is free to slide on a key fixed to the spindle A or a keyway may be arranged on
the shaft A and a key to work thereon fixed to the boss b¹ of upper disc B. The
upper disc B may either be weighted as shown at Fig. 5 or be pressed down to the
under disc by means of a spring D as shown at Fig. 4.
A suitable rope or band G which is driven by a pulley or pulleys in any ordinary
manner is arranged so that as it runs it may be pressed between the faces a¹ of the
two saucer shaped discs B thus revolving the shaft or spindle A and in order to vary
the speed thereof it will be obvious that the said rope G may be forced between the
discs B and as it gets nearer the centre of the discs the speed of the shaft increases
and the farther it moves away from the centre of the discs the slower is the
revolving speed of the shaft A where of course the travelling speed of the rope or
band is constant.
As the rope or baud G is pressed between the discs B the spring or weight allow
the discs or disc to give and the rope or band G is gripped between the faces a¹ of
the discs B thus driving the same by friction.
The rope or band G may be pressed between the faces a¹ of said discs B by means
of suitable guide pulleys or runners H which are moved in one direction or the
other by either hand or foot lever J or a hand wheel K and screw L as will be well
understood.
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-
1. In means for revolving a shaft or spindle at varying speed the use of two
discs B pressed together by a spring or springs or weight and revolved by the
friction of a travelling or running rope or band which is pressed between the faces
of said discs by means of pulleys or rollers operated by hand or foot lever or hand
wheel and screw substantially as described and illustrated.
Dated this 9th day of November 1891.
H. F. BOUGHTON, M.I. Mech. E.,
Sheffield and Barnsley, Agent.