Improvements in or Connected with Power Hammers.
Year: 1889

page_text: Date of Application, 9th Oct., 1889-Accepted, 9th Nov., 1889
COMPLETE SPECIFICATION.
Improvements in or Connected with Power Hammers.
I, ERNST GARTZE, Manufacturer, of Mangenberg, near Solingen, Germany, 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 has for its object to construct a power-hammer which is especially
adapted for forging or shaping iron bars of rectangular cross section, such as are used
for the manufacture of tools, forks and knives; but which may also be applied for
forging round pieces, if the latter are turned during the operation.
As shown by the accompanying drawings, of which Fig. 1 is a side elevation,
Fig. 2 a plan, and Fig. 3 a cross section, the apparatus chiefly comprises 2 tilt hammers,
one of which moves vertically, and the other horizontally. They may, however be
arranged to move in oblique planes, at a right angle to each other. Each hammer bar
is mounted on a pair of trunnions or pivots b, b, and adapted to oscillate thereon.
Motion is imparted to the hammer bars from a driving shaft w provided with
suitable driving gear.
On this shaft are fixed two cams 8, s¹ provided with teeth a, a¹,
and arranged in such a manner as to act alternately on the first and on the second
hammer; so that the piece of work is alternately struck from either side.
any
As shown by the detail views Figs. 4 and 5, the anvil is of angular shape and is
provided with a spring f (or two springs) which holds the piece of work in such a
manner, that it will not lie flat on the working face of the anvil, in which case the
latter would un-necessarily cool the hot piece of work. The spring also prevents the
piece of work from getting into the corner of the angular anvil during the process of
hammering, in such a manner that the hammer meets the piece of work with the edge,
which would soon round off the edge and render it useless.
If, in the machine shown, the horizontal hammer be set in motion, the spring lifts
the piece of work slightly up, and when the vertically movable hammer is in opera-
tion, the spring keeps the piece of work laterally away from the corner of the
angular anvil.
If two springs are employed, they cross each other, and form an angle corre-
sponding to the anvil, but at a higher level. The hammer bars are thrown against the
anvil by the springs d.
To render the lift of the hammers variable, the pivots or trunnions are adjustable
in the following manner. The conical extremities of the pivots rest in corresponding
sockets of the short screw spindles q, which pass through slots and are fixed at the
required point by means of screw nuts m. In order to place the hammers more
forward or backward, as may be desired, the base plate that carries the two main
bearings is rendered adjustable by shifting the screws e, e in their slots.
To diminish the friction between the springs d and the hammer bars, their ends are
armed with friction rollers r, which may, however, be secured to the hammer bars
(instead of being applied to the springs).
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. In power hammers, the combination of two hammer bars having pivots placed at
right angles to each other, with revolving cams adapted to lift the hammer bars, and
en angular anvil. substantially no dasaribed and for the n

page_text: 2. A power hammer constructed as specified by claim 1, and provided with springs
adapted to keep the piece of work away from the edge of the angular anvil, and to
yield in the direction of the motion of the hammer bars, substantially as described.
Dated this 9th day of October 1889
ERNST GARTZE.
By Fairfax & Wetter,
433, Strand, London, Agents.