An Improved Governor, especially applicable to Gas Engines and the like.
Year: 1896

page_text: Date of Application, 6th Nov., 1896-Accepted, 23rd Jan., 1897
COMPLETE SPECIFICATION.
An Improved Governor, especially applicable to Gas Engines and
the like.
I, ROBERT CALDWELL, of Wellesley Street, Auckland, in the Colony of New
Zealand, Mechanic, 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 :-
The object of my invention is to provide a governor which shall overcome the
difficulties and inconveniences experienced by the governors at present in use,
more particularly upon gas engines and the like, and one which shall be more
regular and certain in its action in governing the engine.
I carry out the object of my invention by a governor of simple construction,
consisting in one form of a disc provided with an arm, which arm at slow speeds, or
when the engine is at rest, is held in position by a spring, but at speeds greater than
required the resistance of the spring is overcome by centrifugal force and the arm
projects beyond the periphery of the disc. When in the latter position the arm
will touch the spindle of the valve at each revolution keeping it closed for a longer
or shorter length of time according to the distance the arm is advanced by the speed
of the engine.
In slow speeds, or when the engine is at rest, the valve is kept open by a spring
and the regulation of the admission of explosive mixture to the cylinder is effected
by closing or partially closing the same as just mentioned.
In order that my invention may be most easily understood I will now describe
the same in detail, and in doing so shall refer to the accompanying drawings,
whereon similar letters and figures of reference indicate similar parts throughout
the views.
Figure 1 is a front view of my governor and valve adapted to the mixing
chamber of an ordinary gas engine and showing the arm closed and the valve
open.
Figure 2 is a side view of the same, the chamber being omitted.
Figure 3 is a front view of the same, showing the arm projecting and the valve
closed.
Figure 4 is a front view of a governor provided with two arms.
Figure 5 is a front view of another form of governor with two arms.
Figure 6 is a front view of another form of governor with the arm on the side of
the disc and the valve open.
Figure 7 is a side view of the same, the chamber being omitted.
Figure 8 is a front view of the same, showing the arm projecting, and the valve
closed.
Referring to the drawings, (a) is the disc mounted upon the shaft (b) which is
geared or otherwise connected to the crank shaft of the engine and by which it is
revolved. An arm (c) is pivotted to the disc (a) at (al) and is held at slow
speeds in the position shown in Figure 1 and by spring (d). The tension of this
spring (d) may be regulated by nut (d 1) and screwed stud (d2). At high speeds
arm (c) will assume a posicion varying more or less from that shown in Figure 1,
to that shown in Figure 3, in which latter case it has been thrown outwards by
centrifugal force until it has touched and depressed spindle (e) of valve (f) until
the latter is closed upon its seat (1). Immediately the speed is decreased and

page_text: the arm (c) recedes the valve (f) is again opened by spring (9) which will raise the
valve to admit a fresh supply of explosive mixture to the cylinder. The tension of
spring (9) may be regulated as required by nuts (91).
In cases where it is desired to keep the valve closed for a greater length of time
during each revolution of the governor I provide two arms arranged as shewn in
Figure 4, and in Figure 5 I have shewn another form where the disc is replaced
by a central piece (h).
It will thus be seen that my governor operates by allowing the admission valve
to remain open during slow speeds, or when the engine is at rest, but at higher
speeds the spindle (e) and valve (f) are continually depressed to a greater or less
distance to regulate the admission of explosive mixture to orifice (j) and the
cylinder of the engine.
It will be obvious that my invention admits of modifications by a skilled person,
as for example, spring (d) may be dispensed with and the arm (c) made in the form
of a spring fixed upon the periphery of the disc: (a) instead of pivotted as at (a1),
and in other ways my invention may be modified without departing from the spirit
of the same.
It will be evident that as the normal position of the admission valve admits of a
free passage for the gas or other motive fluid, a stop valve.must be provided to
shut off the same when the engine is at rest.
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 a governor for gas engines and the like, in combination, an arm pivotted
upon a disc and provided with a tension spring and a valve and spindle, provided
with a spring to keep the valve open at slow speeds and when the engine is at rest,
substantially as and for the purposes set forth.
2. In a governor for gas engines and the like, in combination, arms pirotted
upon a disc and provided with tension springs and a valve and spindle provided
with a spring to keep the valve open at slow speeds, and when the engine is at rest,
substantially as and for the purposes set forth.
. 3. In a governor for gas engines and the like, in combination, arme pivotted
upon a central piece and provided with tension springs, and a valve and spindle
provided with a spring to keep the valve open at slow speeds, and when the engine
is at rest, substantially as and for the purposes set forth.
4. A governor especially applicable for gas engines and the like, constructed,
arranged and operating, substantially as and for the purposes set forth herein aud
illustrated on the accompanying drawing.
Dated this 6th day of November 1896.
NEWNHAM BROWNE,
Agent for the Applicant.