Year: 1888

page_text: Date of Application, 18th June, 1888
Complete Specification Left, 27th July, 1888
Complete Specification Accepted, 26th Oct., 1888
I, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark, of 53, Chancery
Lane in the County of Middlesex, Fellow of the Institute of Patent Agents, do hereby
declare the nature of this invention (a communication to me from abroad by William
Henry Van Wart, of Stonington, State of Connecticut, and Edward Augustus
Deveau of Brooklyn, State of New York, both in the United States of America,)
to be as follows:-
This Invention relates to an improved nut lock for valves; and consists essentially
of a divided band adapted to clamp on the neck of a globe valve bonnet, and an arni
on the band to bear against the valve nut, and secure it.
A. MELVILLE CLARK.
By A. M. & Wm. Clark,
53, Chancery Lane, London,
Patent Agents.

page_text: ад шproveu
I, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark, of 53, Chancery
Lane, in the County of Middlesex, Fellow of the Institute of Patent Agents, do hereby
declare the nature of this invention (a communication to me from abroad by William
Henry Van Wart, Engineer, of Stonington, in the County of New London, and State of
Connecticut, and Edward Augustus Deveau, Gentleman, of Brooklyn, in the County
of Kings, and State of New York, both in the United States of America,) and in
what manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
As is well known in globe valves in which compressible packing is employed between
the packing nut and valve stem, the packing becomes consolidated to such an extent
as to cause, when turning the valve stem in one direction, a corresponding rotation
and unscrewing of the packing nut, especially if a large quantity of packing is
employed.
The object of the present invention is to provide a practical device which may be
readily applied to securely maintain the packing nut against unloosening or
nuscrewing under the turning of the valve stem; and the invention consists in a
novel construction and combination of parts, as hereinafter particularly described, an
essential feature of which is a clamping ring or like clamping base adapted to be
clamped to the bonnet neck or other suitable part of the valve and to bear by a
projecting arm on said ring against one of the side faces of the packing nut.
Reference is to be had to the accompanying drawings forming a part of this
specification; in which figure 1 is a side elevation of a globe valve having applied
thereto one of the improved devices for locking the nut. Figure 2, is a partial
central sectional view of figure 1. Figure 3, is a plan view of the valve nut lock
detached, and figures 4, 5, and 6, represent modified forms of the locking device, to be
hereinafter referred to, drawn to a larger scale. Similar letters of reference indicate
corresponding parts in all the figures.
Referring to figures 1, 2, and 3, the neck a of the bonnet A receives about its
exteriorly threaded end, a packing nut or gland B, between the inner side of which
nut and the valve stem C, a suitable compressible packing D is employed to form a
steam-tight joint; all of which parts may be of the standard, or any approved, form
and arrangement. Around, or upon, the bonnet neck a or other suitable part of the
valve, is disposed a divided strap, yoke, or ring E the ends of which meet, or nearly
meet, each other and are provided with lugs or ears ee through which a thumb or
set screw F passes in a manner to draw the ring to a more or less contracted circum-
ference and thereby firmly clamp it upon the valve neck against rotation. An arm e¹
projects from the ring E in a plane coincident with that of the flat faces of the
polygonal packing nut B and when the locking device is clamped in place any
tendency of the packing nut to loosen in response to the turning of the valve stem,
will be resisted by the arm e¹ of the nut lock. When it is desired to loosen or remove

page_text: the packing nut B for repacking or repairing, the clamping ring E is loosened
slightly whereupon it will turn freely with the nut; or the clamping ring may be
removed altogether.
In valves of large size where rings or straps of necessarily heavy construction
would be employed such as would not permit of a spring contraction, it is preferable
to form such straps or rings E in two members hinged as at e², figure 4, to enable a
certain and easy adjustment and attachment thereof on the valve casing; or if desired
the clamping screw F may be pivoted, as at fin figure 5, in one ear piece e of the
clamping ring so that it may be swung into an open slot, as at f¹ in the opposite ear
piece, a wing nut f2 screwing on it and bearing against the outer face of the slotted
ear for the purpose of tightening up the clamping ring.
In the construction illustrated in figure 6, the clamping ring E consists of a divided
spring band which, by its own spring tension, maintains its position on the valve. In
this construction, the nut locking arm e¹ is preferably offset, to accomodate the
packing nut. By off-setting the arm, the whole device may be struck up from very
light or thin metal at a very low cost. The spring band is sprung on to the valve
neck so that the arm e¹ will lie flat against one side of the polygonal packing nut, as
before.
As all, or very nearly all, valves of the general construction shewn in figures 1 and 2
are formed with like bonnet shanks or necks, no inconvenience will be experienced in
applying the nut lock.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. A valve nut locking device adapted to be clamped to the bonnet neck or other
part of the valve, substantially as described.
2. A valve nut lock constructed and operating substantially as shown and
described.
3. A valve nut lock consisting of a contractible strap or ring provided with an arm
or lug, substantially as, and for the purpose, specified.
4. A locking device for the packing nuts of valves, consisting of a divided strap or
ring having ears at its ends and a set screw in said ears and a locking arm, substantially
as, and for the purpose specified.
5. A valve nut lock consisting of a divided spring band or ring having an arm
extending therefrom, substantially as, and for the purpose, specified.
Dated this 27th day of July 1888
A. MELVILLE CLARK.
By A. M. & Wm. Clark,
53, Chancery Lane, London,
Patent Agents.