AN IM- PROVED TILT HAMMER
Year: 1866

page_text: PROVISIONAL SPECIFICATION left by William Edward Gedge at the
Office of the Commissioners of Patents, with his Pétition, on the 8th
October 1866.-A communication from abroad by Philippe Tisserand,
of 39, Faubourg St. Martin, Paris, France.
I, WILLIAM EDWARD GEDGE, of the Firm of John Gedge, and Son,
of No. 11, Wellington Street, Strand, in the County of Middlesex, Patent
Agent, do hereby declare the nature of the said Invention for "AN IM-
PROVED TILT HAMMER," a communication to me from abroad by Philippe
Tisserand, of 39, Faubourg St. Martin, Paris, France, to be as follows:-
The tilt hammer, the subject of this Invention, differs from other tilt
hammers in several points, firstly, in the invariable weight of the hammer;
secondly, in the variation of speed by means of a single pulley; thirdly, in an
absorption of motive power one half less; fourthly, in that its dimensions are
more restricted, and its cost price less.
The machine is composed of a cast-iron framing provided with two brackets
or pedestals cast with it, and also with. two slots or slides. This framing is
fixed at its lower part on a wooden frame resting on a layer of concrete
("béton"), the thickness of which will be regulated by the nature of the
ground. Between these two pedestals works a cam shaft moved by a pulley

page_text: which itself receives its movement from any sort of motor; a fly is also fixed
on this shaft. The hammer is a piece of iron hollowed out in the middle in
part of its length so as to give passage to the cam, and furnished on each side
with slide bars intended to work between the slots of the framing. In a cast-
iron cylinder fixed at its upper part and placed above the hammer is inserted
a wooden plug intended to receive the shock of the hammer in its ascending
movement; above this plug are arranged four india-rubber washers, between
which copper discs are inserted to prevent the washers adhering together; the
discs carry in their middle and on their horizontal surface a circular rib which
takes into the washers to keep them concentric to the cylinder; these discs
are adjusted so as to play in a rod fixed at its lower part to the plug, and at
its upper part in a hole pierced following the axis of a screw which serves as
guide to it. A nut placed at the upper part of the cylinder is held to it by
means of a washer taking into a groove made in this nut. A toothed wheel
is fixed on this same nut, and is set in motion by a pinion fixed to the rod of
a crank.
In order to permit variation of the tension of the driving belt a lever
is used terminated at its upper part by a roller which comes pressing
against the belt, and thus gives it the desired tension; a catch comes butting
against a ratchet fixed to the framing, and thus keeps the lever, and
consequently the tension of the belt, in an invariable position when once
fixed.
The machine works as follows:-The order of the working being settled,
the workman stretches the belt by means of the lever above described, and
thus gives it a tension more or less great, according to the speed which it is
desired to obtain.
It will be understood that the maximum of speed answers to the maximum
of tension. The pulley set in motion by the belt moves in its turn the cam
shaft on which it is fixed, the cam then lifts the hammer, which arriving
against the wooden plug compresses the india-rubber washers up to the
time when the cam letting go the hammer this latter falls and strikes the
piece to be forged with all the more violence the more forcible has been the
compression.
From the combination of the arrangements described it results that by
acting upon the crank in any direction the piston attached to the screw
is made to rise or lower, and consequently to more or less compress the india-
rubber washers; when the hammer strikes against the plug the intensity of
the blow upon the piece to be forged is proportioned to the compression of

page_text: the washers. Any description of spring capable of fulfilling the object in view
may be used in lieu of the spring arrangement above described, whether
carriage, spiral, or other spring. A break acting upon the fly moderates its
action and stops it completely if necessity arise.