IMPROVEMENTS IN HYDRAULIC MACHINERY FOR PULLING HEAVY WEIGHTS, AND STRAIGHTENING METAL SHAFTS, BARS, BEAMS RAILS, AND TUBES
Year: 1868

page_text: PROVISIONAL SPECIFICATION left by Joseph Tangye and John
Nainby Kitching at the Office of the Commissioners of Patents,
with their Petition, on the 26th September 1868.
We, JOSEPH TANGYE, of Birmingham, in the County of Warwick,
Engineer, and JOHN NAINBY KITCHING, of the City and County of
Dublin, Engineer, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN HYDRAULIC MACHINERY FOR PULLING HEAVY WEIGHTS,
AND STRAIGHTENING METAL SHAFTS, BARS, BEAMS, RAILS, AND TUBES," to be as
follows:-
This Invention consists, firstly, of a tube or cylinder made of steel, iron,
or other metal having a cistern fitted to it, which cistern contains a
force pump (the plunger of which is actuated by an internal cam
operated by an external lever similar to those used in the hydraulic
punching and shearing machines, for which Letters Patent was granted
to Joseph Tangye, under date 14th March 1863, No. 694). Attached to
the bottom of the pump is a tube working through a stuffing box screwed
into a piston; to the other side of the piston a steel tube (which forms
the piston rod) is screwed or fastened, inside of which the smaller
working tube is enclosed. At the opposite end of the outer tube to

page_text: which the cistern is attached a cap is fitted having a stuffing box con-
taining a leather cup or packing as generally used in hydraulic apparatus.
The tube attached to the piston forms the rod which suspends the
apparatus or jack and carries the load. At the upper end of the said tube
a hook or eye or other holder is screwed or otherwise fastened. At the
bottom end of the cistern a plug is secured by means of a screw or
other method of fastening, the inside of which is bored and acts as a guide
for the plunger of the force pump, and on the outside a hook and link
or swivel is attached to receive the sling or other means of suspending
the load; a stop valve is also provided to permit and regulate the ascent
or descent of the weight at pleasure.
To charge the above-described implement with water or other liquid,
the bottom plug is taken out and the whole interior filled; the said plug
being then replaced the operation of pulling up the load or weight will
be performed in the following manner, namely:-Assuming the piston
to be at the bottom of the cylinder with the stop valve closed, the stop
valve must be opened to allow the cylinder with the cistern to slide
down the tubular piston rod till it reaches the weight to be lifted, then
close the valve and actuate the force pump by means of the hand lever;
the water or other fluid will then be forced up through the small tube
within the tubular piston rod, and will also be forced through some
small holes in the said piston rod close to the upper side of the piston.
The pressure of the fluid will thus be exerted between the upper side
of the piston and the cap at the upper end of the cylinder, by which
means the weight will be raised to the height determined and will remain
suspended when the operation of pumping is stopped. To lower the jack
or load the stop valve is unscrewed, the water or other fluid will then
pass from the upper to the lower side of the piston and into the cistern
at the bottom.
This Invention consists, secondly, of an hydraulic cylinder made of
steel, iron, or other metal provided with strong projecting arms; the
cylinder has also a projecting boss, on to which is fitted a cistern, and
into the end of which is secured a force pump, the plunger of which
is actuated by the cam and lever as before described. A ram is fitted
loosely into the cylinder, and is made sound by a leather packing in
the usual manner. The projecting arms of the cylinder are furnished
with links which slip loosely on to them and on to the shaft to be
straightened or bent; these links have loops at the top through which

page_text: a bar is passed for slinging the cylinder during the operation of bending
the shaft. When used for the purpose of straightening a shaft for
turning the shaft is placed between the centres of a lathe or other
machine, the links being previously slipped on to it; the cylinder is
placed under the shaft on the lathe bed, the projecting arms being in
the links, the stop being closed, and by actuating the cam and lever
the water or other fluid is forced into the cylinder, causing the ram to
rise and bend the shaft in any required place. Between the top of
ram and the shaft to be straightened is placed a lever, and after the
required pressure has been given the ram is lowered by opening the stop
valve and pressing on the lever when the water or other fluid returns
from the cylinder to the cistern.