Metal deforming – With means to drive tool – Including pneumatic- or fluid-actuated tool support
Reexamination Certificate
2007-04-03
2007-04-03
Larson, Lowell A. (Department: 3725)
Metal deforming
With means to drive tool
Including pneumatic- or fluid-actuated tool support
C072S350000
Reexamination Certificate
active
10801552
ABSTRACT:
In a die cushion apparatus, a pressurizing force acting on a die cushion pad is applied to a first piston of a hydraulic cylinder unit by the operation of a slide, the first piston slides inside a first cylinder and pressure oil in a first hydraulic chamber is pressurized. The first hydraulic chamber is linked to a second hydraulic chamber of a booster cylinder unit via a second check valve, so that the pressure oil of the first hydraulic chamber is pushed out into the second hydraulic chamber. When the pressure of the first hydraulic chamber is applied to a second piston, the second piston slides inside the second cylinder and gas of a gas pressure chamber is compressed, whereby a surge pressure is reduced.
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Bonk Teresa M.
Komatsu Ltd.
Larson Lowell A.
Wenderoth , Lind & Ponack, L.L.P.
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