Automatic Frictional Governor for Marine and Stationary Engines.
Year: 1888

page_text: Date of Application, 29th Nov., 1888
Complete Specification Left, 27th Sept., 1889-Accepted, 2nd Nov., 1889
PROVISIONAL SPECIFICATION.
Automatic Frictional Governor for Marine and Stationary
Engines.
THOMAS GEORGE STEVENS Esther Villas Swanscombe in the County of Kent*
Engineer do hereby declare the nature of this invention to be as follows:-
:-
It is designed to prevent raceing in heavy weather, which takes place during the
non-immersion of the Propellor or Paddle Wheels.
To effect this I fix a Disc or Wheel to the Propellor Shaft, around this disc,
I apply a Friction Band, each end of the Band has a nut pivoted to it, one with a
right handed screw thread cut in it, and the other with a left handed screw thread.
Corresponding screw threads cut on a spindle are made to screw into the two Nuts, so
that, by a partial turn of the Spindle, the Band may be tightened up around the Disc,
and so steady the Propellor Shaft, during heavy raceing.
The two screw threads on the Spindle, I make of different diameter, so that the
one of smaller diameter, may be passed end wise freely through the nut, for the larger
screw thread. This allows of the screw spindle being unscrewed, and readily
separated, from both nuts, whenever the apparatus may have to be taken to pieces.
In order also, that the whole strain for retaining the Friction Band, from turning,
may not be taken upon the screw spindle, I form the band with a radial pin, or pro-
jection, projecting outwards from it, to fit into a corresponding radial recess, in the
fixed standard which carries the bearings for the screw spindle.
The pin or projection, I provide with a Coil Spring, to take off vibration of
Friction Band.
At one end of the screw spindle I fit a cogged wheel, which is worked by a cogged
rack, or other suitable appliances, automatically, by means of an ordinary governor,
driven from the propellor shaft, so that when the Engines run above full speed, the
action of the Governor, will cause a valve to throttle the steam pipe, and at the same
time, will cause the friction gear to come in action, & so steady the propellor
Shaft.
The Rack which turns the screw spindle, is worked by various mechanical
contrivances
COMPLETE SPECIFICATION.
Automatic Frictional Governor for Marine and Stationary
Engines.
THOMAS GEORGE STEVENS Esther Villa Swanscombe, in the County of Kent
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 is an apparatus designed to prevent the "racing" which takes place
in heavy weather during the non-immersion of the propellor or paddle wheels.
To effect this I affix a disc or wheel (D) to the propellor shaft; around this disc
1 apply a friction band (B) each end of the band has a nut (N) pivotted to it, one with
a right handed screw thread cut in it, and the other with a left handed screw thread.
Corresponding screw threads cut on a spindle (S) are made to screw into the two
nuts so that by a partial turn of the spindle the band may be tightened up around the
disc, and so steady the propellor shaft during heavy "racing."

page_text: The two screw threads on the spindle I make of different diameter, so that the one
of smaller diameter may be passed end wise freely through the nut for the larger screw
thread. This allows of the screw spindle being unscrewed and readily separated from
both nuts whenever the apparatus may have to be taken to pieces.
In order also that the whole strain of retaining the friction band from turning may
not be taken upon the screw spindle, I form the band with a radial pin or pro-
jection (P) projecting outwards from it to fit into a corresponding radial recess in the
fixed standard which carries the bearings for the screw spindle.
The pin or projection I provide with a coil spring (C) to take off vibration of
friction band.
At one end of the screw spindle I fit a cogged wheel (W) which is worked by a
cogged rack (R) or other suitable appliances, automatically, by means of an ordinary
governor driven from the propellor shaft, so that when the engines run above full
speed, the action of the governor will cause a valve to throttle the steam pipe, and
at the same time will cause the friction gear to come into action and so steady the
propellor shaft.
1
The rack which turns the screw spindle is worked by various mechanical
contrivances.
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. The combination of apparatus as above described for the automatic controlling or
governing of the propeller shaft.
2. In apparatus for the purposes above described the method of tightening the
friction brake by a screw shaft; such screw shaft having two screw threads of
different diameter, allowing the shaft to be unscrewed and readily separated from both
ends whenever the apparatus may have to be taken to pieces.
3. In apparatus such as is above described the use of pivot or swivel nuts on
the friction band, through which nuts the screw shaft passes in corresponding
screw threads.
4. In apparatus such as is above described the use of a radial pin or projection on
the friction band, the said pin or projection being fitted with a coil spring to take up
the vibration of the friction band.
5. The automatic controlling of propeller shafts by various mechanical
contrivances.
Dated this 27th day of Sentember 1889
THOMAS GEORGE STEVENS.