Improvements in the Actuating Device of Drop Hammers Operated by Band Friction.
Year: 1897

page_text: COMPLETE SPECIFICATION.
Improvements in the Actuating Device of Drop Hammers Operated
by Band Friction.
I, FRITZ THEILE, Schwerte in the Province of Westfalia in the German Empire,
Manufacturer, 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:-
The present application relates to improvements in the actuating device for drop
hammers operated by band friction, and its object is to effect a more governable
contact between the driving belt and the drum than has hitherto been attained.
The improvement illustrated in Figures 1 and 2 has reference to the actuating
of a drop hammer not driven by a machine.
A special drum c to which is secured a strap or bande at k which is connected
at one end to a rod a and at the other end to the hammer m, is provided for each
drop hammer. This drum is provided with projections d, d
arranged at
suitable intervals in such a way that the strap or band e bears on them even when
in a position of rest.
These projections across the surface of the drum are fastened to it preferably
by means of screw bolts f. The strap or bande is fastened to the hammer by
means of cramps g in such a manner that it stands somewhat apart from the
hammer.
The distance between the band and the drop hammer may be varied as desired
by means of, for instance, guides h. The rod a is in connection with the foot-
lever preferably as shown. A projection is provided at the lower part of
the drum c. When operating the foot-lever, the band rests closely upon the
projections d, d, which, acting as lever arms, cause rotation of the drum about
its axle until it reaches the position illustrated in Figure 2, it lifts the drop
hammer until the projection comes into contact with the inside of the belt
and then causes a quick turning in a backward direction of the drum by virtue
of the recoil caused in releasing the foot-lever , so that a free drop of the hammer
will take place. It may be advantageous in some cases to vary the height of tho
projections d, d, or to make them adjustable according to the amount of weight
or the desired height of the drop of the hammer. It is obvious that any number
of drums and drop hammers may be arranged on the shaft b.
A modification is illustrated in Figures and 4 of the accompanying drawings
in which it is intended to either considerably increase the drop of the hammer or
to use heavier hammers. In this case the drum rotates continually in the direction
indicated by the arrow. A lever-arm carrying a roller g² is moveably mounted
upon the support arm i which latter is fastened in any suitable manner to the
main frame. This lever arm is supported by the rod d which is fastened to the
roda just beneath its point of connection to the band. In pressing down the rod
arrangement by actuating the foot lever 1, the roller g presses the band tightly
against the rotating drum, and the hammer m is lifted to any desired height more
easily than heretofore on releasing the foot lever, the roller g² becomes disengaged

page_text: from the band, and thus a better, and also more powerful drop of the hammer is
attained.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:
-
1. In drop hammers of the type referred to, providing the strap drum with
projections to act as levers and a further one (₫) to effect a better drop of the
hammer through the recoil substantially in the manner herein described and set
forth.
5
2. In drop hammers of the type referred to, providing a friction roller outside 1
the drum at the end of a lever rod connected to the strap, to regulate the height of
the drop substantially in the manner herein described and set forth.
Dated this 19th day of August. 1897.
PHILLIPS & LEIGH,
No. 22 Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicant.