Improvements in and pertaining to Knuckle Joints for Safety Valve and other Levers.
Year: 1894

page_text: Date of Application, 18th Apr., 1894
Complete Specification Left. 4th May, 1894-Accepted, 30th June, 1894
TRUVIDIONAL DIECIFICATION,
Improvements in and pertaining to Knuckle Joints for Safety Valve
and other Levers.
I, JAMES BALDWIN, of Devonshire Brass Works, Keighley, in the County of
York, Brassfounder, do hereby declare the nature of this invention to be as
follows:-
This invention relates to knuckle joints for safety valve and other levers, and to
apparatus or appliances pertaining thereto.
The object of my invention is to construct a knuckle jointed lever that shall be
free from liability to bind at the joint and from preventing or retarding the
movement of the safety valve or other part to which it may be attached.
In carrying my invention into effect when constructing a knuckle joint for the
lever of a boiler safety valve, I forge or construct the lever from wrought iron
or other suitable material, in the ordinary manner. I form holes or eyes within
the lever for the reception of the fulcrum pin, and for the connecting pin of the
valve rod or stem, and provide for the usual adjustable weight or spring at the
free end of the lever.
.
I employ a forked or slotted stud bracket or bearer, for supporting the fulcrum
pin, and for forming the jaw of the knuckle joint. The width of the jaw is con-
siderably greater than the thickness of the lever which it embraces in order that
the latter may have free play or movement at the joint. To keep the lever
central in the jaw, and prevent its contact with the sides of the same I mount
anti-friction rollers upon the fulcrum bracket or bearer, on each side of the jaw,
and in such a manner that the periphery of the rollers shall be near to, or slightly
in contact with, the sides of the lever. The sides of the lever can thus only come
into contact with the peripheries of the anti-friction rollers, which, offering but
very slight resistance, enables the lever to be moved freely and easily about its
fulcrum.
To protect my improved knuckle joint from injury, and from the accumulation
of dirt, or ashes, I preferably encase it within a cover of cast iron or other
material. The cover or casing is provided with a suitable base, and has a slot
formed within one end to allow the casing to be passed over the lever and placed
in position. I also employ my improved cover or casing for enclosing a lever
knuckle joint of the ordinary construction.
I do not limit the application of my invention to any one type of lever, or to any
particular form of knuckle joint, or fulcrum bracket or bearer, but modify the
form and arrangement of such parts to suit the requirements of varying services,
without departing from the essential features of my invention.
Dated this 17th day of Anril 1801
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents for the Applicant.

page_text: Improvements in and pertaining to Knuckle Joints for Safety Valve
and other Levers.
I, JAMES BALDWIN, of Devonshire Brass Works, Keighley, in the County of
York, Brassfounder, 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 knuckle joints for safety valve and other levers, and to
apparatus or appliances pertaining thereto. The object of my invention, is to
construct a knuckle jointed lever that shall be free from liability to bind at the
joint, and from preventing or retarding the movement of the safety valve, or other
part, to which it may be attached.
In carrying my invention into effect, when constructing a knuckle joint for the
lever of a boiler safety valve, I forge or construct the lever from wrought iron, or
other suitable material, in the ordinary manner, I form holes or eyes within the
lever for the reception of the fulcrum pin, and for the connecting pin of the valve
red or stem, and provide for the usual adjustable weight or spring at the free end
of the lever. I employ a forked or slotted stud, bracket, or bearer, for supporting
the fulcrum pin, and for forming the jaw of the knuckle joint. The width of the
jaw is considerably greater than the thickness of the lever which it embraces, in
order that the latter may have free play or movement at the joint. To keep
the lever central in the jaw, and prevent its contact with the sides of the same,
I mount anti-friction rollers upon the fulcrum bracket or bearer on each side of the
jaw, and in such a manner that the periphery of the rollers shall be near to, or
slightly in contact with the sides of the lever. The sides of the lever can thus only
come into contact with the peripheries of the anti-friction rollers, which, offering
but very slight resistance, enables the lever to be moved freely and easily about its
fulcrum.
To protect my improved knuckle joint from injury, and from the accumulation
of dirt or asbes, I preferably encase it within a cover of cast iron or other material.
The cover or casing is provided with a suitable base, and has a slot formed within
one end, to allow the casing to be passed over the lever and placed in position.
I also employ my improved cover or casing for enclosing a lever knuckle joint
of the ordinary construction.
I do not limit the application of my invention to any one type of lever, or to any
particular form of knuckle joint, or fulcrum bracket or bearer, but modify the
form and arrangement of such parts to suit the requirements of varying services,
without departing from the essential features of my invention.
In place of the anti-friction rollers I can make use of balls for obtaining the
same result.
In the accompanying drawings,
Fig. 1. shows a sectional view of my improved joint, a. ie the bracket or bearer,
B. is the fulcrum pin, C is the valve rod, and D. is the lever which carries the
adjustable weight or spring. Fig. 2. shows an end view of the bearer a. with the
fulcrum pin B. giving a space between the lever D. and the jawe E. E.
Fig. 1
shows the anti-friction rollers F. F. and Fig. 2 shows an end view of same
at F. F. F. F., these rollers being slightly in contact with the sides of the lever D.
Figs. 1 and 2.
The cover for protecting the joint from injury and dirt is shown at G. in Fig. 1
with a slot H.
Fig. 3. shows a plan of Fig. 1.
Fig. 4. shows an end view of the cover G. with the slot H.
Fig. 5. shows a plan of same

page_text: Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The improved joint for safety valve and other levers substantially as
> described and shown in drawings.
2. In a safety valve or other lever the use, in the knuckle or fulcrum joint, of
anti-friction rollers.
3. In a safety valve or other lever the use, in the knuckle or fulcrum joint, of
anti-friction balls.
4. The use of a casing for protecting the knuckle or fulcrum joint, in safety
valve or other levers, from damage or dirt, substantially as described and shown in
drawings.
1004
JAMES BALDWIN.