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Патент USA US2117575

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May 17, 1938.
L sAlvEs
2,117,575
POWER HAMMER FOR STAMPING WITH COUNTER-TUE’
Filed Sept. 9, 1936
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Patented May 17, 1938
2,117,575
UNITED STATES PATENT OFFICE
2,117,575
POWER- HAMMER FOR STAIWPING WITH
COUNTER-TU?
Leon Saives, Billancourt, France, assignor to
Louis Renault, Billancourt, France
Application September 9, 1936, Serial No. 100,051
In France April 17, 1936
1 Claim.
This invention relates to improvements in power
hammers with counter-tup which are distin
guished from ordinary power hammers and
stamping tups by the elimination of the anvil
block and. of the considerable foundation which
supports it, the inertia of the anvil block being
replaced by the live energy of a mass which moves
at the same time as the hammer in the opposite
direction and strikes against that hammer in its
10 movement. The movements of the hammer and
of the movable mass are made dependent upon
each other either by a mechanical connection
(cables, metal bands) or by a common drive, for
example a pneumatic drive (air or steam) acting
15 on pistons secured respectively to the hammer
and to the mass. The stamping dies interposed
between the hammer and the mass are projected
against each other by the simultaneous move
ments of these two parts in opposite directions.
In the known power hammers having counter
20
tup, the upper die is carried by the hammer while
the lower die rests on the movable mass moving
in the opposite direction. It follows that this
‘lower die is not ?xed as in ordinary power ham
mers where it rests on the anvil block. It there
fore becomes very di?icult to place, hold and work
the piece on the die and all these operations im
pose an additional fatigue on the workman.
The object of the present invention is to obviate
30 this disadvantage by constructing a power ham
mer with counter-tup in which the lower die is no
longer carried by the movable lower mass, the
live energy of which is utilized, but by an inter
mediate block, which is interposed between the
hammer and the movable mass and which is not
subjected to any considerable movements. The
workman can then easily place and hold on the
lower die the piece to be forged without additional
fatigue.
40
The intermediate block is maintained at a
height determined after adjustment according to
the dimensions of the dies employed. The mov
able lower mass approaches this intermediate
block, to which it transmits its own velocity at
the end of the stroke, and the impact is produced
between the two dies, the movement of this in
‘ termediate block being reduced to the minimum.
The adjustment of the position of the interme
diate block even makes it possible to obtain si
50 multaneous impacts of the hammer and of the
(Cl. 78-13)
lower mass without appreciable movement of this
intermediate block andof the lower die. After
the impact, the intermediate block and the lower
die remain in position for the succeeding impact,
while the hammer and the lower mass, con
nected together in their simultaneous movements,
move apart for a fresh impact.
It is evident that the invention is applicable
irrespective of the form of connection between
the hammer and the movable mass.
10
A form of construction of a power hammer
with counter-tup according to the invention has
been shown by way of example in the accom
panying drawing.
In the example shown, the hammer I and the 15
lower movable mass 2 are ?xed through the me
dium of shock-absorbers 3 and 4 to the rods 5
and 6 of the pistons 'l and 8 actuated by the
same ?uid under pressure. The rods 6 slide in
the interior of the rods 5 which are hollow.
The upper die 9 is carried by the hammer,
while the lower die In is carried by an interme
diate block Ii ?xed at a predetermined height
to the guide columns l2 through the medium of
shock-absorbers [3.
25
As explained hereinbefore, the hammer l and
the mass 2 approach the intermediate block simu1~
taneously and strike it from both sides without
this block, which carries the lower die, undergo
ing any appreciable movement.
The hammer l
and the mass 2 then move apart for a fresh im
pact.
I claim:
A power hammer for stamping with counter
tup comprising in combination, a hammer carry 35
ing an upper die adapted to be moved vertically
downward, a movable mass positioned below said
hammer adapted to be moved vertically upward,
an intermediate block carrying a lower die inter
posed between the hammer and the mass, said
intermediate block having a substantially hori
zontal upper face for receiving a work-piece,
means for simultaneously moving said hammer
and said mass towards each other, so that the
intermediate block receives the blow of the ham
mer at one side and the blow of the mass simul
taneously at the other Without undergoing ap
preciable movement.
LEON SAIVES.
50
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