IMPROVEMENTS IN STAMPS FOR FORGING AND SHAPING METALS
Year: 1882

page_text: PROVISIONAL SPECIFICATION left by Arthur Winkler Wills at the Office
of the Commissioners of Patents on the 8th December 1882.
ARTHUR WINKLER WILLS of Birmingham in the County of Warwick Manu-
facturer IMPROVEMENTS IN STAMPS FOR FORGING AND SHAPING METALS
13
My invention consists in constructing and arranging the parts of the said stamps
in the following manner.
On the main shaft of the stamp I place three discs the circumference of which is
greater than the height to which the stamp head or hammer of the stamp has to be
raised. One of these discs is fixed to the shaft and another is connected to the
shaft by a key which permits it to slide on the shaft while partaking of its rotary
motion. Between these fixed and sliding discs the third disc is situated. This
third disc turns loosely on the shaft and only rotates when it is gripped between
the fixed and sliding discs. To this the loose dise the upper end of the strap or
band by which the hammer of the stamp is raised is attached. The inner edges of
the fixed and sliding discs are inclined and on both edges of the loose disc counter
inclines are made against which when the sliding disc is pressed towards the fixed
disc the inclines on the fixed and sliding discs bear with a wedging action.
When by the action of the mechanism hereinafter described the sliding disc is
pressed towards the fixed disc the loose disc is gripped between them and by the
When the
rotation of the driving shaft the hammer of the stamp is raised.
pressure on the sliding disc is removed the gripping action ceases and the hammer
of the stamp falls.
The gripping and liberating of the loose disc is effected at the required times in
the following manner. The outer face of the sliding disc has a conical boss and
opposite to this boss is a similar conical boss fixed either on the main shaft or to the
framing of the machine Between these conical bosses is a wedge having anti
friction rollers on its inclined acting faces. This wedge is carried by a lever by the
elevation and depression of which the wedge can be pressed upon the two conical
bosses and raised from off them. When the said wedge is pressed upon the bosses
it effects their separation the sliding disc being pressed towards the fixed one and
the loose disc being gripped between them. When the hammer of the stamp has
been raised to the required height the lever carrying the wedge is raised when the

page_text: loose disc being no longer gripped the hammer of the stamp falls. The lowering
and raising at the proper times of the lever carrying the wedge is effected
automatically in the following manner. The said lever when at liberty to move is
pressed down with the required force by means of a weight or spring. To raise it
and fix it in its raised position a short lever is stationed underneath it and crossing
it. The free end of this short lever terminates near the edge of the loose disc.
On the edge of the loose disc a tappet or projection is fixed in such a position that
when by the turning of the said disc the hammer of the stamp has been raised to
the required height the said tappet comes under the end of the short lever
and lifts it and through it the lever carrying the wedge. The lifting of the wedge
liberates the loose disc and the hammer of the stamp falls.
But it is necessary to keep the wedge in its raised position till the hammer of
the stamp has nearly completed its descent. To effect this the vertical arm of a
spring bell crank lever snaps underneath the short lever described and supports it.
When however the hammer of the stamp has nearly completed its descent a tappet
or projection on the side of the loose disc opposite to that carrying the before
mentioned tappet strikes the horizontal arm of the bell crank lever and thereby
withdraws the vertical arm from under the short lever and the wedge descending
the hammer of the stamp is again raised.
In this way the alternate raising and liberating of the hammer of the stamp is
effected. But it is necessary that the workman should have the power of stopping
and starting the stamp at pleasure. For this purpose a pedal or foot lever is
provided. This foot lever is pressed upwards by a spring and when in its raised
position it supports the wedge lever in its raised position and at the same time
tightens a band brake on the loose disc. The loose disc and consequently the
haminer of the stamp are thereby fixed in the positions to which they have been
brought. When however the workman presses down the pedal or foot lever the
brake on the loose disc is slackened, the wedge lever is no longer fixed in its raised
position and the automatic action described sets in. Immediately the workman
ceases to press upon the pedal the machine is brought to rest and the hammer of
the stamp suspended in any required position.
•
In order to give still further control over the stamp another lever is provided by
lifting which the wedge lever is supported in its raised position. The last described
mechanism is useful when fixing and changing the tools of the stamp and also
affords the means of throwing the whole mechanism out of gear with the driving
shaft should the breakage or failure of any part render it desirable to do so.