Improvements in Governors for Steam and other Engines and the like.
Year: 1891

page_text: Date of Application, 15th Jan., 1891
Complete Specification Left, 25th Aug., 1891-Accepted, 19th Dec., 1891
PROVISIONAL SPECIFICATION.
Improvements in Governors for Steam and other Engines and
the like.
I, JOHN JAMESON, of Akenside Hill, Newcastle-on-Tyne do hereby declare the
nature of this invention a communication to me from Charles Tuckfield, Albany,
Western Australia, to be as follows:-
I construct a screwed shaft on which a nut is placed loosely fitting to the
thread of the screw. On the nut I place a series of vanes so that they may be
set more or less directly at right angles to the plane of revolution when the nut is
turned on the axis of the screw. I cause the screwed shaft I have described to
revolve at a definite ratio of speed proportioned to the rate at which the engine.
travels. By this means according to the position of the vanes on the nut, is the
pressure produced tending to move the nut on the screw in one direction or the
other, and variation of speed produces great variation of pressure. I employ
the movement so produced by variation of speed to operate on the valves of a
steam engine or on a brake on the shaft of which it is required to regulate the
speed. may also employ this device as an automatic electrical commutator.
Dated this Fourteenth day of January 1891
COMPLETE SPECIFICATION.
Improvements in Governors for Steam and other Engines and
the like.
A communication from CHARLES TUCKFIELD, of Albany, Western Australia.
I, JOHN JAMESON of Akenside Hill, Newcastle-on-Tyne in the County of
Northumberland, 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 :-
This invention which is applicable to steam and other engines windmills turbines
and other motive power engines will be best understood by reference to the accom-
panying drawings in which
Figure 1 is an elevation partly in section of a governor constructed according to
this invention and
Figure 2 is an end elevation of the shaft and arm for taking off the motion to
the governor.
Figure 3 is a detail showing application of governor to electrical purposes.
A is the shaft screwed for a sufficient portion of its length A² and carrying
the nut B into which are screwed the vanes C by their spindles C₁ which may
be locked in any required position by the lock nut C. Upon the shaft A is the
pulley D preferably having a key-way cut in it for the passage of the feather A'
by which arrangement the pulley will carry the shaft round with it, but the shaft
can reciprocate longitudinally through the pulley. This pulley D may be driven
in any convenient manner from or by the motor which the governor is to control
or other suitable means may be employed for giving motion to the shaft A, the
important feature being that the speed of A must vary with that of the motor to
be controlled. The nut is prevented from travelling along the worm A² by
the tubes E secured to the framing F which carries the whole movable part of the
apparatus.
The end of the shaft A remote from the pulley D is reduced and carries a
sleeve G which is prevented from escaping from the shaft by the fixed collar H
secured upon the end of the shaft. The sleeve G carries the trunnions G¹ which
Price 6d |

page_text: pass through slots I in the jaws. of the arm J which may be carried upon the
shaft K and the motion from that taken direct to the throttle valve lever, or utilized
in any other convenient manner. Guides L are secured upon the framing and have
slots L' in which the trunnions G₁ travel as the shaft reciprocates longitudinally.
Any other suitable means may be employed for taking off the motion of the
shaft A.
The operation of this apparatus is as follows:-
The shaft A is revolved by the pulley D and carries with it the nut B and
vane C, all these parts revolving together as a whole. When however the
resistance of the vanes C, due to the speed at which they are travelling, overcomes
the friction between the nut and the shaft the latter travels faster than the nut
and by the action of its screw thread in the nut is projected forward longitudinally,
imparting its movement to the throttle valve or otherwise as already explained.
This movement closes the throttle valve or otherwise reduces the speed of the
motor to which the governor is applied, in consequence of which the shaft A revolves
at a slower speed and the vanes overtaking the shaft return it to its normal position,
or beyond, in which case the speed of the motor will be increased beyond the
normal and the shaft will again overtake the vanes and the same operations will
be repeated again and again.
It will be seen that in this apparatus there is no connection between the screw
and the nut other than that due to the friction between the two, whereas in
previous apparatus of this description a spring connection has been established
between these two parts such spring representing the whole power available in the
apparatus for use in controlling the motor. In the present apparatus therefore
the power is only limited by the capacity of the vanes C and their friction with the
atmosphere or other medium in which they work.
In employing this device as an electrical governor the movement of the shaft A
may be so arranged as to make and break electrical circuits, the current being
employed in any convenient manner as by electro-magnets to effect the necessary
operation. In Fig. 3 M represents an electro-magnet, the ends of the exciting
coil being connected to two conducting strips N N insulated from each other by
the block n. As the shaft A moves endwise the free end of the strip N will be
forced against the strip N¹ and an electrical circuit will be completed and the
electro-magnet energized and caused to attract an arm or equivalent for inserting
or withdrawing the necessary resistances or otherwise operating to secure the
desired result.
Having now particularly described and ascertained the nature of the said
invention, as communicated to me by my foreign correspondent, and in what manner
the same is to be performed, I wish it to be understood that I am aware that
governors embracing vanes, nut and screw have before now been employed and
that I make no general claim to such apparatus, but what I claim is :-
1. In a governor of the nature described a shaft such as A to which longitudinal
movement is imparted solely by the action of the resisting medium upon the vanes
and without the intervention of a spring substantially as described.
2. In a governor of the nature described a shaft such as A to which longitudinal
movement is imparted in both directions solely by the action of the resisting
medium upon the vanes and without the intervention of a spring substantially as
described.
3. The combination with a governor such as described of electrical apparatus
whereby the movement of the shaft A operating as described is employed to control
one or more electrical circuits for the purpose of regulating the motor to which
the governor appertains substantially as described.
Dated this 30th day of September 1891.
W. P. THOMPSON & BOULT,
Agents for the Applicant.