A Casing for Enclosing the Working Parts of Safety Valves.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
A Casing for Enclosing the Working Parts of Safety Valves.
I, EDMUND JACKSON, 75, Fawe Park Road, Putney, S.W., Mechanical Engineer,
do hereby declare the nature of this invention to be as follows:-
A casing to enclose the working parts of direct spring loaded safety valves,
specially those constructed with a crosshead attached to the main body by dis-
tance pieces secured by nuts-this casing is of metal of cylindrical shape and in
halves longitudinally hinged on one side and secured by one or more bolts or
screws on the other. A lock can be attached thus preventing the removal of
casing and access to the spring and working parts. The ends of this casing havo
projections which engage with corresponding recesses on the crosshead and main
body so that when the casing is in position and secured by lock, the crosshead
remains attached to the main body even though the nuts on distance pieces are
unscrewed. An attachment can also be included with this casing for easing the
valve and also for rotating it on its seating
Dated 11
1
1000
A Casing for Enclosing the Working Parts of Safety Valves.
I, EDMUND JACKSON, formerly of 75, Fawe Park Road, Putney, S.W., now of
55, Amerland Road, West Hill, Wandsworth, S.W., Mechanical 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 follow-
ing statement:-
This invention has for its principal object the protection of direct spring loaded
safety valves against injury from tampering and foul usage. This object is
attained by enclosing those parts of the apparatus that affect the working of such
valves, and the valves themselves when they can be got at after the valves are
fixed and in place, in protecting casings, which protecting casings are formed and
secured in the manner hereinafter described.
Figure 1, and Figure 2, of the drawings show, partly in elevation and partly
in section, the invention applied to a safety valve suitable for portable loco-
motive and land boilers.
Figure 2 is a plan of Figure 1.
Figure 3 is a section of a marine boiler type of spring safety-valve with the
protecting casing applied thereto.

page_text: Figure 4 is a part plan of Figure 3.
Figure 5 shows, partly in section and partly in elevation, a variation in the
construction of the marine type of safety-valve with the protecting casing applied
thereto.
Figure 6 is a vertical section through the valve and
Figure 7 is a cross section of Figure 5 taken partly at the level of the top of
the valve seating, and partly just above the valve, to show the toothed rim
thereof and a pinion geared therewith for the purpose of enabling the valve to be
rotated by means of an axle having one or more projections thereon-two are
shown this axle which is headed is provided with tommy holes and may be
circular, hexagonal, or of other suitable shape; if not circular, the " tommy"
holes may be dispensed with and a spanner" used to turn it with.
a
6
(a) is the protecting casing: this is made in two pieces which are hinged
together, ((b) are the hinges) and have eyes (c) formed on them; through these
eyes a screwed eye-bolt (d) is passed, the eye furthest from the head of the eye-
bolt being screwed to match the thread of the latter, so that when the eye-bolt
1s screwed up the two parts of the casing are drawn tightly together. The eye-
bolt (d) has the bow-of a padlock put through its eye (e) and is then locked (see
Figure 4). The padlock is not shown.
The top of the casing is made to embrace a neck (f) formed on the projecting
piece (9) of the spring thrust piece (h); and the bottom of the casing embraces a
neck () on the body of the valve seating (y) in spring safety valves used for
land boilers; and in the marine type of spring safety-valves, enbraces a neck (k)
formed on the metal enclosure (1) of the valve (m¹). The object of the casings
being made to embrace the necks (f, i,) and (f, k) is to prevent any evil disposed
person from attempting to remove the spring thrust pieces (h) in order to get at
thevalves (m, m), or other of the enclosed vital parts, which it will be seen cannot
be accomplished surreptitiously when valves are constructed in' accordance with
this, specification, (n, n) are tie-bars 'which take the strain' put upon the spring
thrust piece (h) by the spring (o). The holes (p) in the casing are outlets for
any steam that may escape about the springs, for even in the case of the marine
type of spring safety-valve vapour may escape by way of the hole through which
the spring spindle (9) passes, as this hole must be of such a size as to allow of the
easy movement of the said spring spindle (9). The steam outlet holes (p) may be
in other positions than that shown On the spring spindle (q) is formed a disc (r)
upon which the spring (o) rests. The top of the spring (o) bears against a nut (s)
on the screwed projecting piece (9) of the spring thrust piece (h), and by means
of this nut (s) the compressive action of the spring can be adjusted before the
protecting casing (a) is put in place, the nut (s) being turned by means of the
tomiy holes (t) or by a spanner when the nut is of a hexagon shape; 2,3,
or more "tommy" holes being formed in each nut, three are indicated in Figures 1
and 3 these nuts are secured in place by set-screws (u), tapped holes for the
receipt of which are provided in the nuts (s): only one set-screw need be used
although three or 'more holes for it should be provided to permit of fine adjust-
ment of the 'spring. To add to the security of the fixing of the nut (s) a flat (v)
may be made upon the screwed part of (9) for the set-screw to seat itself on (see
Figure 3)...
In order that those in charge of a boiler, to which a safety-valve with the
improved casing has been applied, may ascertain if the valve is in good working
order and has not stuck, a lever (w)-is provided to enable; the valve to be lifted;
these levers (w) as shown on Sheets 1 and 2 of the drawings are forked at one
end, and the end of each prong (r) of the fork is hook shaped; these hooks (y)
pass around pins (-) secured on the valve (m) in the case of land boilers, and on
the spring spindle disc (r) in the case of marine boilers; the spindle in the latter
safety valves being attached to the valve by any suitable means such as a screwed
pin (1) and 2 lugs (2) on the valve (m¹). On the under side of the prongs of the
fork towards the stem of the lever are projections (3), which bear on the lips (4)

page_text: of the
The
and act as fulcrums for the lever (c) to rest and work on. The stem of the
lever (c) passes through a hole made in one of the sides of the protecting casing,
or the hole mav be made in the casing at the junction
sides so as to be partly in one piece and partly in the other.
valves (m and m¹) shown on Sheets 1 and 2 are capable of being
partially rotated by means of the lever (w). In lieu of the levers (1),
shown on Sheets 1 and 2 of the drawings, the levers may be made as shown on
Sheet 3, and have the screw arrangement (5, 6, 7) to work the lever, for the pur-
pose of lifting the valve; also the form of valve with pinion (8) turning on
axle (9) may be used. By revolving the axle (9) the pinion (8) is caused. to
turn and with it the valve (m²) by means of the teeth (10) that are formed on
the outer circumference of it The levers (c) may be constructed with knuckle
joints to permit of their being folded up against the casing for convenience of
passing the tiebars if valve is required to be completely rotated.
Slight variations may be made in the construction of the protecting casing (a),
and in the method of fastening it, and in the safety-valve as a whole, without
departing from this invention, for instance, in lieu of the two hinges (b) a
second pair of eves with screw and padlock, similar to (c) and (d) may take
their place: further, instead of only one set of the eves (c) and screwed eye-
bolt (7), shown for fastening the protecting casing, a second set may be used: or
three, or four eyes may be formed on the casing and a headed pin threaded
through them and secured by a padlock passed through a hole in the end of the
pin, may be substituted therefor.
Having now particularly described and ascertained the nature of my said
invention and what manner the same is to be performed, I declare that what
I claim is:
1. The use of a protecting casing made for, used with, and applied to, spring
loaded safety-valves as hereinbefore described and set forth, and as shown by
the drawings.
2. The spring loaded safety valves with protecting casing and levers as des-
cribed, and shown by the drawings