US2117575A - Power hammer for stamping with counter-tup - Google Patents

Description

May 17, 1938. L v s 2,117,575

POWER HAMMER FOR STAMPING WITH COUNTER-TUE Filed Sept. 9, 1936 i s I i l I I 5 3 I I Patented May 17, 1938 UNITED STATES PATENT OFFICE POWER- HAMMER FOR STAIWPING WITH COUNTER-TU? 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 distinguished 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 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 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 movements of these two parts in opposite directions.

In the known power hammers having countertup, 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 fixed as in ordinary power hammers where it rests on the anvil block. It therefore becomes very difiicult to place, hold and work the piece on the die and all these operations impose an additional fatigue on the workman.

The object of the present invention is to obviate this disadvantage by constructing a power hammer 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 intermediate 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.

The intermediate block is maintained at a height determined after adjustment according to the dimensions of the dies employed. The movable 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 intermediate block being reduced to the minimum.

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, connected 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.

A form of construction of a power hammer with counter-tup according to the invention has been shown by way of example in the accompanying drawing.

In the example shown, the hammer I and the lower movable mass 2 are fixed through the medium of shock-absorbers 3 and 4 to the rods 5 and 6 of the pistons 'l and 8 actuated by the same fluid 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 intermediate block Ii fixed at a predetermined height to the guide columns l2 through the medium of shock-absorbers [3.

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, undergoing any appreciable movement. The hammer l and the mass 2 then move apart for a fresh impact.

I claim:

A power hammer for stamping with countertup comprising in combination, a hammer carrying 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 interposed between the hammer and the mass, said intermediate block having a substantially horizontal 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 hammer at one side and the blow of the mass simultaneously at the other Without undergoing appreciable movement.

LEON SAIVES.

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