Improvements in Packing for Stuffing Boxes.
Year: 1892

page_text: Date of Application, 15th Nov., 1892
Complete Specification Left, 24th June, 1893-Accepted, 2nd Sept., 1893
Improvements in Packing for Stuffing Boxes.
A communication from HUGO HERZENSKRON, of Hanover, in the Empire of
Germany.
I. ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
M.I. Mech. E., and Chartered Patent Agent, do hereby declare the nature of this
invention to be as follows:-
A generally known disadvantage with packings for stuffing boxes is their rather
quick wearing, so that they only answer their purpose a very short time, the reason
whereof is chiefly the want of sufficient elasticity in most of the cordlike packings
heretofore, brought out, the inlaid india rubber kernel, fast wound up, being unable
to work, as the tucks, once hardened, lose the little elasticity which they originally
possessed.
A good packing keeping its elasticity for a long period will be of great value,
especially with portable steam-engines, marine engines &c., where slight distortions
of the rods of pistons and slide-valves in consequence of the working of the engines,
and leakages of stuffing boxes, caused thereby, are unavoidable.
The new packing attains an extremely high degree of elasticity by the arrange-
ment of a number of elastic sheets or rings preferably indiarubber pipes enclosing
material capable of absorbing grease, and forming an elastic cushion between any
two rubber layers.
It is assumed that the grease can be absorbed by the loosely wrought filling
material, and that burning and hardening cannot occur, as it does with cotton filling
and tallow.
The packings forming a ring, the ends of which are laid flat against each other,
and are thus put into the boxes, a strict closing of the ends will be seldom attained,
and the grease enters by the joints into the interior of the cushions extending itself
all over the bearing surface and making a tight joint.
Where less elastic packings are applied, distortions of the piston-rods &c. cause
an immediate "blowing" of the packing-boxes; the steam will escape at the
suddenly eased parts of the stuffing; whereas the new packing will, by its great
elasticity, fill up the space left, and firmly surround the rod, thus preventing the
joint from blowing.
At the pressed parts of the packing, the grease will be partly pressed out of the
filling material, only to be, at the next counter-distortion, absorbed again.
The screwing up of the joint or gland whereby the exterior form of the packing
may be altered, is of no influence on the elasticity of the kernel, the latter not
being subjected to serious alterations of its shape.
The said kernel is, in accordance with the purpose of the packing surrounded
with any suitable kind of material or any number of layers, and may be also
provided with a seamless tissue covering.
1000
W. P. THOMPSON & BOULT,
Of London, Liverpool, Manchester, and Nottingham,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Packing for Stuffing Boxes.
A communication from HUGO HERZENSKRON, of Hanover, in the Empire of
Germany.
"
1, ALFRED JULIUS BOULT, of 323 High Holborn, in the County of Middlesex,
Chartered Patent Agent, 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 :-
A generally known disadvantage with packings for stuffing boxes is their rather
quick wearing so that they only answer their purpose a very short time, the reason
whereof is chiefly the want of sufficient elasticity in most of the cord-like packings
heretofore brought out, the inlaid indiarubber kernel fast wound up, being unable
to work, as the tucks once hardened, lose the little elasticity which they originally
possessed.
A good packing, keeping its elasticity for a long period, will be of great value,
especially with portable steam engines marine engines &c., where slight distortions
of the rods of pistons and slide-valves in consequence of the working of the engines,
and leakages of stuffing boxes, caused thereby, are unavoidable.
The new packing, as shown in the accompanying drawings, attains an extremely
high degree of elasticity by the arrangement of a number of elastic sheets or rings
preferably indiarubber pipes a enclosing material capable of absorbing grease and
forming an elastic cushion between any two rubber layers.
It is assumed that the grease can be absorbed by the loosely wrought filling
material, and that burning and hardening cannot occur, as it does with cotton
filling and tallow.
The packings forming a ring the ends of which are laid flat against each other
and are thus put into the boxes a strict closing of the ends will be seldom attained
and the grease enters by the joints into the interior of the cushions, extending itself
all over the bearing surface and making a tight joint.
وو
Where less elastic packings are applied, distortions of the piston-rods &c. cause
an immediate "blowing of the packing-boxes; the steam will escape at the
suddenly eased parts of the stuffing; whereas the new packing will by its great
elasticity, fill up the space left, and firmly surround the rod, thus preventing the
joint from blowing.
At the pressed parts of the packing, the grease will be partly pressed out of the
filling material, only to be at the next counter-distortion absorbed again.
The screwing up of the joint or gland whereby the exterior form of the packing
may be altered, is of no influence on the elasticity of the kernel, the latter not
being subjected to serious alterations of its shape.
The said kernel is, in accordance with the purpose of the packing surrounded
with any suitable kind of material, or any number of layers, and may be also
provided with a seamless tissue covering.
Having now particularly described and ascertained the nature of the said inven-
tion, as communicated to me by my foreign correspondent, and in what manner
the same is to be performed, I declare that what I claim is :-
A packing for stuffing boxes consisting of concentric indiarubber pipes or sheets
with intermediate cotton or other material capable of absorbing grease substantially
as described and illustrated in the accompanying drawings.
Dated this 24th day of June 1893.
W. P. THOMPSON & BOULT,
Agents for the Applicant.