Improvements in Drop Hammers for Forging and Stamping Metals with or without Dies.
Year: 1899

page_text: Date of Application, 23rd May, 1899
Complete Specification Left, 23rd Feb., 1900-Accepted, 7th Apr., 1900
PROVISIONAL SPECIFICATION.
Improvements in Drop Hammers for Forging and Stamping Metals
with or without Dies.
I, ALEXANDER ROBERTSON, of 6, Dawson Terrace, Carron, Stirlingshire,
Engineer, do hereby declare the nature of this invention to be as follows:
My invention has for its object to improve the lifting mechanism of drop
hammers to simplifying the construction and to reduce the shock to a minimum.
In carrying out my invention I erect on a suitable base or anvil block a
pair of upright housings or cheeks. The housings are provided with adjustable
vee pieces or guides to take the head or tup or movable die block. Interposed
between the housings and the guides cushions of cork or other elastic material
are placed for the purpose of minimising the shock. On the housing an ordi-
nary vertical steam hammer cylinder and accompanying mechanism is fitted
and having the upper end of its piston rod forked to take a loose pulley running
on a short transverse stud. The housings are provided with slots in which
the ends of the stud on the upper end of the forked piston rod works thereby
preventing the piston from turning. Over this loose pulley which
grooved or otherwise is passed a rope or ropes, chains or bands one end or ends
may be
of which is or are made fast to any convenient part of the cylinder or housings.
The other end or ends being attached to the tup or die block in such a manner so
that when the piston carrying the pulley is moved in an upward direction the
tup or die block is raised double the distance of the travel of the piston and when
the piston is reversed the tup or die block is free to drop by gravitation on to
the work.
In another modification additional guide pulleys may be provided to permit
of the piston being worked downwards or in any other direction relative to
the tup which may be considered most suitable.
In another modification instead of the piston rod being forked to take the
pulley an ordinary crosshead may be used and arranged to carry an equal
number of pulleys on each side of the piston rod so as to ensure the strain
being equally distributed.
Dated this 22nd day of May 1899.
•
Improvements in Drop Hammers for Forging and Stamping Metals
with or without Dies.
I, ALEXANDER ROBERTSON, of 6, Dawson Terrace, Carron, Stirlingshire,
Engineer, 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 improve the lifting mechanism of drop
hammers, to simplify the construction and to reduce the shock to a minimum.
The invention is illustrated by the accompanying drawings, Fig. 1 being a

page_text: vertical section on the line y-y, Fig. 3, of my improved drop hammer, Fig. 2
a section at right angles to Fig. 1, and Fig. 3 a part plan and part horizontal
section taken on the line -, Fig. 2.
*...
In carrying out my invention I erect on a suitable base A or anvil block a
pair of upright housings or cheeks B. These housings B are provided with
adjustable vee-pieces or guides C. to take, the head or tup or movable die block D.
Interposed between the housings B and the guides C cushions E of cork or other
elastic material are placed, for the purpose of minimising the shock. On the
housing B an ordinary vertical steam hammer cylinder F and accompanying
mechanism is fitted and having the upper, or as shewn, the lower, end of its
piston rod F forked to take a loose pulley running on a short transverse stud;
or instead of the piston Fr being forked to take the pulley, an ordinary cross-
head H may be used, and arranged to carry on studs I formed on said crosshead
an equal number of pulleys G on each side of the piston rod F so as to ensure
the strain being equally distributed. The housings B are provided with slots
in which the ends of the stud on the upper end of the forked piston rod works,
or with guide strips J against which rollers K, also carried on the studs I, bear,
thereby preventing the piston F from turning. Over these loose pulleys G
which may be grooved or otherwise, is passed a rope L or ropes; chains or bands,
one end or ends of which is or are made fast to any convenient part of-the
cylinder or housings, such as at M. The other end or ends of the rope, chain
or band is or are attached to the tup or die block D by being passed under a
pulley N or stud carried therein so that when the piston F carrying the pulleys G
is moved in an upward direction the tup or die block D is raised double, treble
or any other higher ratio of the distance of the travel of the piston F, and
when the piston is reversed the tup or die block is free to drop by gravitation
on to the work.
In another modification additional guide pulleys may be provided to permit
of the piston being worked upwards, horizontal, or in any other direction rela-
tive to the tup, which may be considered most suitable.
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. The improved drop hammer for forging and stamping metals, the parts of
which are constructed, combined and arranged to operate, substantially as
described.
2. In drop hammers for forging and stamping metals, having the ordinary
steam hammer cylinder and piston, and a piston rod provided with a forked end
or crosshead, the combination of a loose pulley or pulleys carried on the cross-
head or forked end, a pulley or stud centred upon the movable tup head or die
block, and a rope or ropes, chains or bands, attached to a stationary part of the
framing and passing over these pulleys in order that the tup may be raised
double, treble, or other higher ratio of the travel of the piston, substantially as
described.
3. In drop hammers for forging and stamping metals, the combination' with
the movable tup, head, or die block, of vee-pieces or guides entering like shaped
recesses in the die block and bearing against cushions of cork or other elastic
material interposed between their opposite faces and the framing, substantially
as and for the purpose set forth.
Dated this 22nd day of February 1900.