Improvements in Hydraulic Press Cylinders.
Year: 1892

page_text: Date of Application, 24th Dec., 1892
Complete Specification Left, 24th Oct., 1893-Accepted, 25th Nov., 1893
PROVISIONAL SPECIFICATION.
Improvements in Hydraulic Press Cylinders.
I, FREDERICK NUNNS of Shaw Syke Halifax, in the County of York,
Mechanical Engineer do hereby declare the nature of this invention to be as
follows:-
My invention consists in substituting for the ordinary cast iron or cast steel
cylinder of hydraulic presses, a number of small steel or iron tubes, the combined
area of which is equal to the area of the ordinary cylinder for which they are a
substitute.
The said tubes are fixed into the underside of the head of cast iron steel, or
wrought iron, with the ordinary recesses upon the top side of the head for leather
or other packing rings or glands for facilitating the releathering of the same.
By this construction of hydraulic press cylinder there are the following
advantages.
They are made at considerably less cost, they are only about half the weight of
the ordinary cylinder, which greatly facilitates their removal, and should any
damage be done through overpressure by carelessness of attendants, not more than
one tube will burst and that will be the weakest, which can be readily replaced at
little cost.
There is less liability to damage the table, the pressure being distributed over a
large area, and should the table be a little out of level, through the press being
unevenly packed, the number of rams will follow up to the table, and make the
pressure equal on all parts they come in contact with.
Each tube is provided with a ram.
Dated this Twenty-third day of December 1899
JOHN E. WALSH,
Crossley Street, Halifax, Patent Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Hydraulic Press Cylinders.
I, FREDERICK NUNNS of Shaw Syke Halifax in the County of York,
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 following statement:-
My invention consists in substituting for the ordinary cast iron or cast steel
cylinder of hydraulic presses, a number of small steel or iron tubes, the combined
area of which is equal to the area of the ordinary cylinder, for which they are a
substitute.

page_text: there packed by means of indiarubber rings E, half of which are within recesses in
the end of the tubes, and half in the recesses in the casting or head B.
The ends of the tubes at their bottom ends A' are welded up.
Each tube is provided with a ram H.
By this construction of hydraulic press cylinder there are the following
advantages.
They are only about half the weight of the ordinary cylinder, which greatly
facilitates their removal, and should any damage be done through overpressure by
carelessness of attendants, not more than one tube will burst, and that will be the
weakest, which can be readily replaced at little cost.
There is less liability to damage the table, the pressure being distributed over a
larger area, and should the table be a little out of level, through the press being
unevenly packed, the number of rams H, will follow up to the table, and make the
pressure equal on all parts they come in contact with.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
The construction of hydraulic press cylinders consisting of a number of steel, or
iron tubes, with corresponding rams, the tubes being inserted into the head, all
operating as and for the purposes substantially as shown and described.
Dated this Twenty-third day of October 1893.
JOHN E. WALSH,
Crossley Street, Halifax, Patent Agent for the Applicant.