Year: 1886

page_text: Date of Application, 25th Oct., 1886.
Complete Left, 25th July, 1887.
Complete Accepted, 13th Sept., 1887.
1, JOHN GOOCH ROCKHILL of Bury Street, in the City of London, Engineer, do
hereby declare the nature of this invention to be as follows:-
My invention relates to guards chiefly designed for the fly-wheels of gas-engines,
and comprises various improvements hereinafter set forth.
One feature of my said invention is the construction and arrangement of a fly-
wheel guard in such a manner that it will afford very efficient protection to persons
standing or passing in proximity to the fly-wheel, but access to the said wheel can be
very readily obtained, for starting the engine or for other purposes, without the
removal or detachment of the said guard from the engine.
For this purpose I so construct the said guard that it only partially surrounds the
fly-wheel and is capable of rotation upon or about the axis of the engine shaft.
Another feature of my said invention consists in making the guard with an extension_
which encloses the projecting end of the shaft.
In carrying my said invention into practice, I provide a ring or annular piece
which is fitted with a capability of rotation upon the outer end of one or the other of
the journal-bearings of the engine-shaft, or upon a boss formed on or secured to, the
bed plate or frame of the engine and concentric with the said shaft. The rim of the
guard is firmly connected with this ring or annular piece by means of metal rods or
in any other convenient manner. The outer side of the guard consists of a metal
frame which is preferably covered with wire netting; this frame is made with a
central extension which encloses the projecting end of the shaft.
having its end pointed is passed through a screw-threaded hole in the centre of this
extension in such a manner that the point of this bolt will enter the centre hole in
the end of the shaft. The said bolt thus forms a support for the outer side of the
guard, whilst permitting the said guard to rotate freely upon, or about, the axis of
the said shaft. The aforesaid ring or annular piece is preferably made in two parts
united by bolts or otherwise, so that it can be fitted and secured in place without
removing the fly-wheel from the shaft,
A screw-bolt

page_text: The guard is so made that it encloses say about three-fourths of the wheel, leaving
a portion of the said wheel uncovered to permit ready access thereto for starting the
engine. After the engine has been started the guard is to be partially rotated until
the opening in the same is next the floor or platform upon which the engine is
supported. It will then afford efficient protection to persons standing or passing in
proximity to the fly wheel. I usually provide one or more stops for limiting the
rotary movement of the guard.
The rim of the guard may consist of a plate of steel or other metal. I prefer to
secure it to the frame by means of screws and to bend it to the desired shape or
configuration while it is being secured to the frame, so that its elasticity will tend to
straighten it, and it will, therefore, exert tension upon the parts of the frame and
thus stiffen the said frame. The said frame may be further stiffened by screwing up
the bolt in the end of the aforesaid extension of the guard and thus expanding the
said frame laterally.
In some instances, I provide each of the fly-wheels of a gas-engine (when two are
employed) with a guard such as that above described, and connect the said guard by
one or more rods or other suitable means so as to form a guard for the crank of the
engine. The two fly-wheel guards can then be rotated together upon or about the axis
of the shaft.
My improved guard covers both sides of the wheel. Moreover it has the great
advantage that it can be applied to an engine without drilling holes in any part
thereof, or otherwise disfiguring the said engine.
The said guard may, if desired, be supported in any other suitable manner to
permit its rotation upon or about the axis of the engine shaft.
Dated this 25th day of October 1886.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London,
Agents for the Applicant.
I, JOHN GOOCH ROCKHILL, of Bury Street, in the City of London, 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 relates to guards chiefly designed for the fly-wheels of gas-engines,
and comprises various improvements hereinafter set forth.
One feature of my said invention is the construction and arrangement of a fly-

page_text: wheel guard in such a manner that, whilst it affords very efficient protection to
persons standing or passing in proximity to the fly-wheel, it can be readily adjusted
to obtain access to the said wheel for starting the engine or for cleaning or other
purposes, without its removal or detachment from the engine.
For this purpose, I so construct the said guard that it only partially surrounds the
fly-wheel and is capable of rotation upon or about the axis of the engine-shaft.
Another feature of my said invention consists in making the guard with an
extension which encloses the projecting end of the shaft.
In the accompanying drawing, I have shown how my said invention may be con-
veniently and advantageously carried into practice.
Figure 1 is a side elevation of part of an engine provided with one of my improved
fly-wheel guards, the said guard being shown in the position which it should occupy
while the engine is at work.
Figure 2 is an edge view of the same, and
Figure 3 is a section on the line x, x, Figure 2, showing the said guard in the
position to which it is to be adjusted to permit the starting of the engine.
Figure 4 is a transverse section of a part of the said guard and fly-wheel, drawn
to an enlarged scale.
Like letters indicate corresponding parts throughout the drawing.
A is the bed-plate of the engine. Bis the main shaft thereof. C is the fly-wheel.
a is a ring or annular piece of steel, iron or other suitable metal, which is fitted with
a capability of rotation upon a projecting part a¹ of the journal-bearing a² of the
engine-shaft; or it may be fitted, if desired, upon a boss either formed on or secured
to the bed-plate or frame of the engine and concentric with the said shaft. bis the rim
of the guard, which is firmly connected with the ring or annular piece a by means of
metal rods c fastened to the ring a and rim b by screws or rivets or in any other
convenient manner. The outer side of the guard consists of a metal frame d, which
is preferably covered with wire-netting d'; this frame is made, when required, with
a central extension d² which encloses the projecting end of the shaft. A screw-bolt
or set-screw e having its end pointed is passed through a nut or a screw-threaded hole
in a plate suitably secured in the centre of the frame or of the extension d² in such a
manner that the point of the said bolt or set-screw will enter the centre hole in the
end of the shaft. The bolt or set-screw can be tightened as desired and thus forms a
support for the outer side of the guard, at the same time permitting the rotation or
partial rotation of the guard upon or about the axis of the shaft B. The ring or
annular piece a is preferably made in two parts united by bolts for otherwise, so
that it can be easily fitted and secured in place without removing the fly-wheel C from
the shaft B.
The guard is so made that it encloses say about three-fourths or more of the wheel,
as shown, for example, in the drawing, leaving a portion of the said wheel uncovered
so that, when the guard is in the position shown in Figure 3, ready access may be
had to the fly-wheel for the purpose of starting the engine. After the engine has
been started, the guard is to be partially rotated until the opening in the same is in
the position shown in Figures 1 and 2, that is to say, until the said opening is next the
floor or platform upon which the engine is supported. It will then afford efficient
protection to persons standing or passing in proximity to the fly-wheel. I usually
provide one or more stops for limiting the rotary movement of the guard. These
stops may be affixed to the rim b of the guard, or to the frame or bed of the engine
as may be most convenient. In Figure 2, a stop g is shown attached to the bed-
plate A.
The rim b of the guard may consist of a plate of steel or other suitable metal. I
prefer to secure it to the frame by means of screws and to bend it to the desired shape
or configuration while it is being secured to the frame, so that its elasticity will tend
to straighten it, and it will, therefore, exert tension upon the various parts of the
frame and thus stiffen the said frame. The said frame may be further stiffened by
screwing up the bolt e in the end of the extension d² of the guard d and thus
expanding the said frame laterally.

page_text: In some instances, I provide each of the fly-wheels of a gas-engine (when two are
employed) with a guard such as that above described, and connect the said guards by
one or more rods or other suitable means so as to form a guard. for the crank of the
engine. The two fly-wheel guards can then be partially rotated together upon or
about the axis of the shaft, for the purposes above specified.
My improved guard is preferably made to cover both sides of the wheel. It has
the great advantage that it can be applied to an engine without drilling holes in any
part thereof, or otherwise disfiguring or weakening the said engine.
It is evident that the said guard may, if desired, be supported by other suitable
means so as to permit of its being rotated upon or about the axis of the engine-shaft.
When the fly-wheel is used as a driving wheel, I make my guard in such a manner
that it extends from the shaft to or beyond the rim of the fly-wheel, but does not
enclose the said rim, that is to say, the fly-wheel guard is made without a rim such
as that shown at 6 in the drawing.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed I wish it understood that I claim:-
First. A fly-wheel guard which is capable of rotation or partial rotation upon or
about the axis of the engine-shaft and which is so constructed that, whilst it affords
efficient protection to persons standing or passing in proximity to the fly-wheel, it
can be readily adjusted to obtain access to the said wheel, as, and for the purposes,
specified.
Second. A fly-wheel guard provided with an extension for enclosing the projecting
end of the engine-shaft, with or without the set-screw, all substantially as, and for the
purposes, set forth.
Third. The above described method of applying the rim of a fly-wheel guard to the
frame thereof, consisting in taking a flat metal bar or plate, bending the same around
the said frame and securing it thereto by rivets or otherwise, substantially as, and for
the purpose, set forth.
Fourth. The combination of two of my improved fly-wheel guards and means for
connecting them and at the same time forming a guard for the crank, substantially
as set forth.
Fifth. The improved fly-wheel guard constructed and arranged substantially as
described with reference to the accompanying drawing for the purposes specified.
11
ndll
T1
1007
Dated
this 20th day of July 1887.
J. G. ROCKHILL.
Haseltine, Lake & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.