Improvements in Stopping Mechanism for Motive Machinery.
Year: 1890

page_text: Date of Application, 21st Nov., 1890
Complete Specification Left, 13th July, 1891-Accepted, 29th Aug., 1891
PROVISIONAL SPECIFICATION.
Improvements in Stopping Mechanism for Motive Machinery.
We FREDERICK HARDWICK DODSON, of 13 Charlotte Street, Rugby, Mechanic,.
and JAMES LINDSAY SYMINGTON of Spring Street, Rugby, Manufacturer, both
n the County of Warwick do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in the construction and arrangement of
mechanism for the speedy stopping of machinery.
It frequently happens that in factories or other shops where lengths of shafting
are driven, or in the case of engines themselves, that in case of an accident or for
other urgent reasons it is desirable that the said machinery or engine should be
stopped immediately. It is with a view to meet this requirement that we have
made this our invention.
As applied for instance to the stopping of a line or lines of shafting, the
machinery would be constructed and arranged somewhat as follows:-
To the lever or slide, which throws the driving clutch or driving pulley into or
out of gear, is suitably connected the one end of a weighted (or spring operated)
lever, the gravitating tendency of which is to always throw the clutch or pulley
out of driving gear. The weighted end of the lever is now connected to the short
end of a further catch lever, having its fulcrum carried upon a suitable base plate
independent of the lever aforesaid. The longer end of this lever is made to just
catch or latch into a hinged bar or plate or lever to the outer end of which, (or
other suitable part) is connected the one end of a wire, rod, cord, chain, or other
equivalent, the other end of which is carried to any desired part, where convenient
for an operator to manipulate. At this said part the end of the cord, wire, &c. is
connected to an operating lever.
Thus, by operating the said lever the hinged catch bar or plate is lifted from off
the catch lever, and the end of the weighted lever allowed to drop, which thus
communicates with the lever or slide (which throws the driving clutch or pulley into
or out of gear) and thereby stops the machinery immediately.
By again hanging the end of the weighted lever upon the catch lever, the
machinery is again put in motion.
By modifying the mechanism in detail as to its application, it will be readily
seen, that it may be used advantageously for stopping motor engines or other
moving parts.
In applying it to the stopping of engines, the weighted lever aforesaid may be
connected direct to the steam supply valve, but generally we prefer to provide
upon the exhaust side of the engine, an equilibrium or other suitable valve to
which the said weighted lever is connected, by which means the engine is stopped
very much quicker.
The details of this our invention may be somewhat varied without departing from
its nature.
Dated this 20th day of November 1890.
CHARLES T. POWELL,
Applicants' Agent.

page_text: Improvements in Stopping Mechanism for Motive Machinery.
We FREDERICK HARDWICK DODSON, of 13 Charlotte Street, Rugby, Mechanic,
and JAMES LINDSAY SYMINGTON, of Spring Street, Rugby, Manufacturer, both
in the County of Warwick, 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 relates to improvements in the construction and arrangement of
mechanism for the speedy stopping of machinery.
It frequently happens that in factories or other shops where lengths of shafting are
driven, or in the case of engines themselves, that in case of an accident or for other
urgent reasons it is desirable that the said machinery or engine should be stopped
immediately.
It is with a view to meet this requirement that we have made this our invention.
As applied for instance to the stopping of a line or lines of shafting the mechanism
would be constructed and arranged somewhat as follows:-
To the lever, or slide, which throws the driving clutch, or driving pulley into or
out of gear, is suitably connected the one end of a weighted (or spring operated)
lever, gravitating tendency of which is to always throw the clutch or pulley out of
driving gear. The weighted end of the lever is now connected to the short end of
a further catch lever, having its fulcrum carried upon a suitable base plate'
independent of the lever aforesaid. The longer end of this lever is made to just
catch or latch into a hinged bar or plate or lever to the outer end of which, (or
other suitable part) is connected the one end of a wire, rod, cord, chain, or their
equivalent, the other end of which is carried to any desired part, where convenient
for an operator to manipulate. At the said part the end of the cord, wire, &c. is
connected to an operating lever.
Thus, by operating the said lever the hinged catch bar or plate is lifted from off
the catch lever, and the end of the weighted lever allowed to drop, which thus com-
municates with tlie lever or slide (which throws the driving clutch or pulley into
or out of gear) and thereby stops the machinery immediately.
By again hanging the end of the weighted lever upon the catch lever the
machinery, is again put in motion.
By modifying the mechanism in detail as to its application, it will be readily
seen, that. it may be used advantageously for stopping motor engines or other
moving parts.
In applying it to the stopping of engines, the weighted lever aforesaid may be
connected direct to the steam supply valve, but generally we prefer to provide upon
the exhaust side of the engine, an equilibrium or other suitable valve to which the
said weighted lever is connected, by which means the engine is stopped very much
quicker.
The details of this our invention may be somewhat varied without departing from
its nature.
In order to more fully explain this our invention and the manner in which the
same is to be performed, we have appended hereunto an illustrative sheet of
drawings upon which are figures and numbers of reference, similar numbers
referring throughout the several views to the same thing or part.
Fig. 1 shows this our invention as applied to the rapid stoppage of a line or
lines of shafting through the medium of a fast and loose pulley.
Fig. 2, is a side view and Fig. 3, a plan view of the catch part of Fig. 1.
Fig. 4, shows its application to the sudden stoppage of machinery when applied
to a brake upon a pulley or fly wheel.

page_text: Fig. 5 shows its application in a similar manner to the closing of a steam valve
whereby the supply of steam may be suddenly cut off from the engine.
Figs. 6 & 7, are detached views in detail of the supporting catch lever and the
releasing catch.
In Figs. 1, 2, 3, 6 & 7, the shaft 1, is driven by the fast pulley 2, by the side of
which is the loose pulley 3. 4, is the belt fork slide, connected by the link 5, to
the hand lever 6. By means of this lever 6, the belt may be thrown on to, or off,
the fast pulley without interfering with the other part of the mechanism, its motion
being permissible by reason of the flexible or yielding chain or link 7. A slotted
link may be used instead of the chain 7, but we find that the flexible chain answers
best and therefore we have illustrated it.
The other end of the chain 7, is connected to the short arm of the lever 8, which
is fulcrumed at 9. Upon this lever is carried the weight 10.
11, is a bracket fixed to the wall upon which is formed the joint 12, carrying the
supporting catch lever 13. Upon this bracket is also provided the joint 14, carrying
the releasing catch 15, to the front end of which is attached the cord, or chain 16.
In the catch 15, is forined the slot hole 17, which passes over the upper end of the
lever 13, and prevents its forward motion. At the lower end of the lever 13, is
formed the short arm 18, upon which hangs the link 19, to which latter is attached
the end of the lever S. The chain or cord 8, may be carried to any convenient
position by means of pulleys 20, or other similar means, and terminates with a handle
pull 21. Any number of these handles may be arranged about the premises, all
being connected up to the releasing catch 15.
or
The action of the arrangement will now be readily understood:-When it is
desired to suddenly stop the machinery, the handle 21, is pulled downwards, by
which the releasing catch 15, is drawn from off the lever 13, which latter immediately
allows the lever 8, to fall and in so doing pulls the belt fork on to the loose pulley
and the machinery is at once stopped.
In Fig. 4, we have shown how this our invention may be applied to the sudden
breaking of a pulley or a fly wheel. This may if desired be carried out in combi-
nation and simultaneously with the previously described arrangement of throwing
the driving belt on to the loose pulley, or it may be independent. The mechanism
is practically the same:-22 is the pulley or Hy wheel, 23 is the brake, 8" is the
weighted lever, 19" is the link, 13" is the supporting lever, 15 is the releasing
catch, and 16" is the communicating cord.
Thus, as shown, the cord 16" is connected to the cord 16, at 24 so that with the
one pulling of the handle 21, simultaneously the belt is thrown on to the loose
pulley 3, and the brake applied to the pulley 22.
In a similar manner in Fig. 5, we have shown how it may be applied to the
stopping of a steam engine by being connected up to the steam stop valve 25; in
this case also 8" is the weighted lever, 19" is the link, 13" is the supporting lever,
15 is the releasing catch, 16" is the communicating cord. In this case also if
desired it can be used as an independent arrangement or it may be used in conjunc-
tion with an arrangement similar to that illustrated in Figs. 1 & 2, or as shown in
Fig. 4, or with both. In some cases it may be more convenient to use a spring
instead of a weight upon the levers 3, 8", or 8", but preferably where possible, the
weight is used.
Having now particularly described and ascertained the nature of this my said
invention, and in what manner the same is to be performed, we declare that what
we claim is :-
1. The combination with the belt shifting gear of a line or lines of shafting
of the weighted lever 8, flexible or yielding connection 7, link 19, releasing lever 13,
catch 15 and cord 16, constructed and operating substantially as set forth and
illustrated upon the drawings in Figs. 1 & 2, and for the purposes specified.
2. The modified combination of the weighted lever 8º, link 19ª, releasing lever 13ª,

page_text: catch 15, and cord 16", with the brake 23, constructed and operating substantially
as described and illustrated in Fig. 4, and for the purposes specified.
3. The modified combination of the weighted lever 8", link 19", releasing lever 13,
catch 15, and cord 16", with a steam supply valve 25, or its equivalent constructed
and operating substantially as described and illustrated in Fig. 5, and for the
purposes specified.
4. The combination of any or all of the parts herein described and illustrated
constituting these our improved method of suddenly stopping machinery in motion
substantially as set forth.
Dated this 11th day of July 1891.
CHARLES T. POWELL,
12, Cherry Street, Birmingham, Applicants' Agent.