Drop Stamp
Year: 1897

page_text: PROVISIONAL SPECIFICATION,
Steam Drop Stamp.
CHARLES HENRY WYNN, Steel Toy Manufacturer, Commercial Street, Birmingham,
do hereby declare the nature of this invention to be as follows:-
A drop stamp in which the hammer is raised by means of a steam cylinder &
piston. The piston rod is attached by a band to a small pulley on a countershaft
which is placed above the stamp in the same position as in an ordinary drop stamp.
A band from the stamp hammer is also attached to a larger pulley on the same
shaft. The two bands mentioned are wound on the two pullies in opposite
directions so that when the band on the smaller pulley is being unwound the band
on the larger pulley is being wound up. By this means I am able to raise the
stamp hammer a greater distance than the stroke of the piston & at a greater speed
than the piston is driven, & so save wear & tear on the cylinder & piston.
One of the pullies can be made eccentric in order to use up the expansion of the
steam.
Steam Drop Stamp.
I, CILARLES HENRY WYNN, Steel Toy Manufacturer, of Commercial Street,
Birmingham, 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: -
This invention comprises an improved steam drop stamp which I so construct
and arrange as to enable the hammer or weight to be moved a greater distance and
at greater speed than the motor piston, resulting in a saving in the wear and tear
of the motor, and the production of a compact efficient and economical machine.
In order that my invention may be the more readily understood I append here-
unto a sheet of explanatory drawings to be hereinafter referred to.
Figure 1 is a front elevation and Figure 2 a side elevation representing my
improved steam drop stamp.
The motor portion of my stamp comprising the cylinder A with its piston and
piston rod, and the overhead pulleys B and C on the counter-shaft D, are mounted
above the hammer on a suitable framing carried by the girders as E E¹ or other
supports. The piston rod is connected by a flexible band F with a small pulley B,
whilst the hammer or weight G is connected with the large pulley C by the band H.

page_text: The bands F and H are wound on their pulleys in opposite directions so that when
the band F on the small pulley B is being unwound by the movement of the piston
in the direction indicated by the arrow at Figure 2, the band H will be wound on
to the large pulley C, and thus the hammer G will be raised through a distance
greater than the stroke of the piston in the cylinder in the proportion of the
difference between the diameters of the two pulleys.
The return stroke of the piston in the motor cylinder A is effected by the descent
of the hammer G on the opening of the steam release or exhaust valve by the
operation of the handle J, producing an unwinding movement of the band H from
the pulley C simultaneously with a winding movement of the band F on to the
pulley B.
I make such modifications in the parts forming my improved steam drop stamp
and in the combination of the same as may be necessary for its best adaption to
any particular service, but in all cases I arrange for the differential movements of
the motor piston and the hammer or weight as hereinbefore described.
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 steam drop stamps, means whereby the hammer or weight is moved a
greater distance and at a greater speed than the piston in the motor cylinder, sub-
stantially as and for the purposes described.
2. A steam drop stamp constructed and arranged substantially as and for the
purposes described and as illustrated.
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents for the Applicant.