Improvements relating to Drop Stamps or Hammers.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements relating to Drop Stamps or Hammers.
I, DANIEL SMITH, of the Firm of Daniel Smith and Company, of Raglan Street,
Wolverhampton, in the County of Stafford, Engineer, do hereby declare the nature
of this invention to be as follows:-
My invention has for its object the construction of compact, durable, and readily
controlled drop stamps or hammers, and the arrangement of the same in such a
manner as to permit of convenient and economical working.
In the construction and arrangement of a steam drop stamp or hammer in
accordance with my invention I preferably mount the cylinder above the hammer,
the latter being suitably formed for sliding vertically between the ordinary guides
or standards. The piston rod projecting through the lower end of the cylinder
is provided with a racked extension which gears with a pinion mounted on a shaft
arranged at a suitable distance below the cylinder and above the hammer or drop
weight. On the same shaft I secure a pulley or drum upon which coils the steel
or other band connected with the hammer or drop weight.
On the ascent of the piston under the action of the steam admitted to the
cylinder the pinion and drum shaft is revolved in the required direction for
raising the hammer, and on opening the valve to exhaust the hammer falls and
the piston descends within the cylinder. As the piston and cylinder are so ar-
ranged that the former can descend by its own weight, there is little or no retard-
ing of the fall of the hammer.
By providing the necessary ratio between the diameters of the pinion and the
barrel pulley or drum the stroke of the piston, and consequently the length of the
cylinder, can be limited to the required fractional part of the distance through
which the hammer or drop weight is to be raised, to make a compact and con-
venient machine.
The slide or other steam controlling valve is arranged to be worked by foot or
hand operated levers and linkage in any ordinary manner, and I also employ a
tappet device for automatically closing the inlet to prevent too great an ascent
of the piston within the cylinder or closing the exhaust to reduce the effect of the
blow. The admission and exhaust ports between the steam chest and the cylinder
are so arranged as to provide for a steam cushion between the piston and the
cylinder ends.
Instead of mounting the steam or motor cylinder above the hammer or drop
weight as hereinbefore described, I sometimes dispose it diagonally in suitable
standards or framing, or I arrange it in such other position as is most suitable to
meet the requirements of any particular service or place.
In the construction and arrangement of a drop stamp or hammer to be worked
by a rotating shaft, I employ a steam or like controlling gear as hereinafter de-
scribed. On the driving shaft is fixed the drum or pulley on which the steel or
other flexible band connected with the weight is wound. The said band is not
attached to the drum but simply embraces about one-half of its circumference,

page_text: and from thence passes under the intermediate or controlling pulley and over a
guide pulley or pulleys to a weight by which the band is kept sufficiently taut.
The controlling pulley is mounted on the outer end of a piston rod projecting
from a cylinder carried upon a pair of side bars connecting bearings on either side
of the main drum or pulley with the bearings of the guide pulley. On the ad-
mission of steam to one side of the piston within the said cylinder the movement
of the controlling pulley causes the flexible band to grip upon the rim of the
winding drum and to rotate with the same thereby raising the hammer or drop
weight. On reversing the admission of steam the grip of the band is released
and the hammer falls.
The valve for regulating the admission of steam to the cylinder is worked by
a hand or foot lever and linkage, but I employ a tappet device as hereinbefore
referred to for automatically operating the valve when the hammer has been raised
to its maximum height.
MARKS & CLERK,
18, Southampton Buildings, London, W.C.,
13, Temple Street, Birmingham, & 25, Cross Street, Manchester.
Improvements relating to Drop Stamps or Hammers.
I, DANIEL SMITII, of the Firm of Daniel Smith and Company, of Raglan Street,
Wolverhampton, in the County of Stafford, Engineer, do hereby declare the nature
of this invention and in what manner the same is to be performed, to be particu-
larly described and ascertained in and by the following statement:-
My invention has for its object the construction of compact, durable, and readily
controlled drop stamps or hammers, and the arrangement of the same in such a
manner as to permit of convenient and economical working.
On the five accompanying sheets of explanatory drawings to be hereinafter
referred to.
Figure 1 (Sheet 1) is a side elevation and Figure 2 an end elevation of my
improved steam drop stamp or hammer. Figure 3 (Sheet 2) is a sectional eleva-
tion and Figure 4 a sectional plan showing, to a larger scale, the construction of
the motor cylinder and controlling valve.
Figure 5 (Sheet 3) is an elevation, and Figure 6 (Sheet 4) a plan of my drop
stamp or hammer as arranged to be driven from a power shaft. Figure 7 (Sheet
5) is a sectional elevation and Figure 8 a sectional plan showing, to a larger scale,
the steam controlling gear for the power hammer.
The same reference letters in the different views indicate the same parts.
In the construction and arrangement of a steam drop stamp or hammer as illus
trated by Figures 1 to 4 inclusive, I preferably mount the motor cylinder A at
one side of the hammer B, the latter being suitably formed for sliding vertically
between the ordinary guides or standards as C C¹. The piston rod projecting
through the cylinder is provided with a racked extension 1) which gears with a
pinion E mounted on a shaft F arranged at a suitable height above the cylinder A
and above the hammer or drop weight B. On the same shaft I secure a pulley
or drum Gupon which coils the steel or other band connected with the hammer
or drop weight.
On the ascent of the piston H under the action of the steam admitted to the
cylinder A the pinion E and drum shaft F are revolved in the required direction
for raising the hammer B, and on opening the exhaust port the hammer falls
and the piston descends within the cylinder. As the piston and cylinder are so

page_text: arranged that the former can descend by its own weight, there is little or no
retarding of the fall of the hammer.
By providing the necessary ratio between the diameters of the pinion and the
barrel pulley or drum G, the stroke of the piston H, and consequently the length
of the cylinder A, can be limited to the required fractional part of the distance
through which the hammer or drop weight B is to be raised, to make a compact
and convenient machine.
The piston type steam controlling valve J is arranged to be worked by foot or
hand operated levers and linkage in the usual manner, and I also employ an
ordinary tappet device in combination with the weight B for automatically
moving the valve J to close the steam inlet to prevent too great an ascent of the
piston H within the cylinder, or to close the exhaust to reduce the effect of the
blow. The admission and exhaust ports between the steam chest and the
cylinder are so arranged as to provide for a steam cushion between the piston and
the cylinder end.
At Figure 3 a represents the steam port and a¹ the exhaust port. Steam is
admitted to the chest or valve box A¹ through the pipe a². The exhaust steam
passes to the annular space J, formed at the central portion of the valve J, and
from thence to the outlet a³. At Figure 3 the valve J is shown in position for
the admission of steam beneath the piston H.
Instead of mounting the steam or motor cylinder in a vertical position, at one
side of the hammer or drop weight as hereinbefore described, I sometimes dispose
it diagonally in suitable standards or framing, or I arrange it in such other
position as is most suitable to meet the requirements of any particular service
or place.
In the construction and arrangement of a drop stamp or hammer as shown at
Figures 5 and 6 to be worked by a rotating shaft, I employ a steam or like con-
trolling gear as hereinafter described. On the driving shaft F¹ is fixed the drum
or pulley G¹ over which the steel or other flexible band K connected with the
weight is passed. The said band K is not attached to the drum G¹ but simply
embraces about one-half of its circumference, and from thence passes under the
intermediate or controlling pulley L and over a guide pulley M to a weight by
which the band is kept sufficiently taut.
The controlling pulley L is mounted on the outer end of a piston rod projecting
from a cylinder N carried upon a pair of side bars 0 0¹ connecting bearings on
either side of the main drum or pulley G¹ with the cross abutment bracket P.
On the admission of steam to the top side of the piston within the said cylinder N,
the movement thereby imparted to the controlling pulley L causes the flexible
band K to grip upon the rim of the winding drum G¹ and to rotate with the same
thereby raising the hammer or drop weight. On reversing the admission of steam
the grip of the band is released and the hammer falls.
The valve (Figures 7 and 8) for regulating the admission of steam to the
cylinder N is worked by a hand or foot lever and linkage. To automatically
release the grip of the band K when the hammer or weight has been raised to the
maximum height, the abutment block R for the ends of the links S S¹ is lowered
on the operation of the lever T by the ascending weight or hammer. The lower-
ing of the abutment block R permits of such a movement of the links S S¹ (under
the compressive stress imposed upon them) as to release the grip on the band
between the pulley L and winding drum G¹.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what I
claim is:-
1. In drop stamps or hammers, the combination with the winding drum of a
short motor cylinder containing a piston connected by rack and pinion gear with
the drum shaft, substantially as and for the purposes described and as illustrated.
2. In drop stamps or hammers, the combination with a flexible band and a

page_text: winding drum fixed upon and rotating with a driving shaft, of a steam or like
controlling gear, substantially as and for the purposes described and as illustrated.
3. In drop stamps or hammers, the arrangement between a flexible band wind-
ing drum as G¹ and a guide pulley M, of a pulley L so adjustable in position as
to cause the flexible band to be tightened upon or released from the winding
drum, substantially as and for the purposes described and as illustrated.
4. Improved drop stamps or hammers constructed and arranged substantially
as and for the purposes described and as illustrated.
Jated this 15th day of December 1899.
MARKS & CLERK,
18, Southampton Buildings, London, W.C.,
25, Cross Street, Manchester, & 13, Temple Street, Birmingham,
Agents for the Applicant.