A New or Improved Method of Preventing Excessive Speed of Steam and other Motive-power Engines, also for Stopping same,. and in Apparatus connected therewith.
Year: 1891

page_text: COMPLETE SPECIFICATION.
A New or Improved Method of Preventing Excessive Speed of
Steam and other Motive-power Engines, also for Stopping same,.
and in Apparatus connected therewith.
I, WALTER MARTIN MUSGRAVE, of Globe Iron Works, Bolton, in the County
of Lancaster, Mechanical Engineer, do hereby declare the nature of my said
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 relates to a new or improved method of preventing excessive
speed of steam and other motive-power engines, also for stopping same, and in
apparatus connected therewith, and is designed to operate on the valve-gear to
shut off steam by the intervention of the governor, also to stop the said engines in
case the governing medium becomes deranged from any cause.
Fig. 1, Sheet 1, is a side elevation of one modification of my invention, and Fig. 2
is an end view of same.
The spindle A is supported in bearings (not shown) on the cylinder or valve-box
of the engine, and is connected by suitable means to the valve-gear to be actuated.
On the spindle A are mounted the levers B, C, and N. The levers B and N are
firmly secured on the spindle A in any convenient manner.
The lever C is mounted
loosely on the spindle A, and is provided with the catch piece E, which engages
with the outer part of the lever B as shown. The catch piece E is held in position
on the lever B by the spring F. Secured to the catch piece E and pivoted on the
same centre or fulcrum are the arms G and G. The lever C is actuated by the
rod D coupled to the governor in the usual manner.
In case the speed of the engine should be increased so as to cause the governor
to rise to its highest position the arm G¹ will be brought in contact-by the move-
ment of the rod D-with the end of the screw H¹, by which action the catch
piece E will be disengaged from the lever B, after which the weight N₁ on the
lever N will, by the falling action of the said weight, pull or rotate the spindle A
round sufficiently to shut off steam from the engine, thus bringing the latter to a
standstill. The lever N is firmly secured to the spindle A. Before the engine
can be re-started the catch piece É must be re-engaged with the lever B as shown
in Fig. 1.
In case an accident should happen to the gearing driving the governor, causing
it to reach its lowest position the arm G-by the movement of the rod Dwill be
brought in contact with the projection H on the lever J carrying the balance
weight J and the arm K, by which the catch piece K will be disengaged from the
lever B as before described.
To prevent the apparatus acting when the engine is being stopped in the
ordinary manner, the attendant places the lever J and its adjuncts in the position
shown in dotted lines in Fig. 1, which action removes the projection H out of line
with the arm G. On re-starting the engine the notched rod L, which is attached
to the governor rod D at M, engages with the arm K and returns the lever J to its
original position shown in full lines in Fig. 1.
Fig. 3, Sheet 2, is a side elevation of another modification of my invention, and
Fig. 4 is an end view of same.
.
The lever B is secured to the spindle A. and is actuated by the governor rod D
as long as the latter is engaged by the catch E pivoted to the sleeve C. Should
the governor reach its lowest position from any cause the catch piece E is dis-
engaged from the governor rod D by coming in contact with the nuts H¹ on the
arm or spindle H. To the latter is attached the lever J with the balance weight J'
and notch K. The nuts H' can be removed out of line with the catch piece E by

page_text: When the engine is being
re-started the lever J is returned to its original position by the notched rod L
pivoted to the sleeve C on the governor rod D.
pulling over the lever J as previously described.
"Fig. 5, Sheet 3, is a side elevation of another modification of my said invention,
and Fig. 6 is an end view of same.
The spindle A in this modification is also supported in bearings (not shown), on
the cylinder or valve-box of the engine, and is connected by suitable means to the
valve-gear to be actuated. The lever B, as before described, is secured to the
spindle A, and is actuated by the governor rod D as long as the latter is engaged
by the catch E pivoted to the sleeve C. The lever B as shown in the drawings is
in its central position. Should the governor reach its lowest position from any
cause the catch-piece E, pivoted to the sleeve C, is disengaged from the governor
rod D by coming in contact with the cam H on the centre P secured to the lever B.
To the cam H or to the centre P is attached the catch K and lever J carrying the
balance weight J. When the governor reaches its highest position through. an
increased speed of the engine the catch-piece E pivoted to the sleeve C is brought
in contact with the stud H on the lever B by the movement of the rod D. To
prevent the apparatus acting when the engine is being stopped in the ordinary
manner the attendant places the lever J and its adjuncts in the position shown in
Fig. 7, which removes the cam H out of action with the catch E. On re-starting
the engine the notched rod L engages with the catch K, as shown in Fig. 7, and
returns the cam H, catch K. lever J, and balance weight J, by the movement of
the lever B when operating in the direction indicated by the arrow, to their original
working position shown in Fig. 5. In this arrangement the rod L is pivoted at the
point M, which is stationary.
Fig. 7, Sheet 3, shows the lever B in its extreme position with the rod L
engaging the catch K.
Figs. 8 and 9, Sheet 3, show a modified arrangement wherein the spring S is
substituted for the lever J and balance weight J'. This device may also be adopted
in the other forms of the apparatus before described.
Having thus stated the nature of my invention and described the modes of
performing the same, I would have it understood that I do not confine myself to
the precise details or configuration of the parts I have shown and described, which
are obviously capable of considerable variation without departing from the principle
of my invention, but what I claim is :-
1. The method of preventing excessive speed of steam and other motive-power
engines and for stopping same, consisting essentially in releasing a catch or its
equivalent from a lever on a spindle connected to the valve-gear by means of arms
or levers or their equivalents attached to the said catch coming in contact with
fixed or other stops through the extreme rising and falling actions of the governor
together with means for automatically operating the lever and spindle connected
to the valve-gear when released from the aforesaid catch, substantially as described
2. For carrying out the before described method of preventing excessive speed
of steam and other motive-power engines and for stopping same through the
and
extreme rising and falling actions of the governor, the arrangement, use,
construction of the various modifications of my improved apparatus, substantially
as described and illustrated by the drawings.
Dated the 12th day of February 1891.
EDMUND CHADWICK,
Agent.