Patent ID: 6263721
Filing Date: 2001-07-24
Classification: B21D

Abstract:
An upper tool holder apparatus in a press brake, comprising:a holder main body to be mounted detachably to an upper table in a press brake, the holder main body having an upper tool supporting section for supporting an upper tool, a lower portion of the holder main body, the holder main body further having a mounting plate which is pressed and fixed to an upper table at an upper front surface of the holder main body;an upper tool clamp supported by the holder main body, the upper tool clamp having an engagement projection at a bottom tool clamp, the engagement projection being engaged with a drop-prevention groove provided in the upper tool;a pressing section is provided on a lower portion of the upper tool clamp, the pressing section pressing the upper tool against the upper tool supporting section;clamping force applying means for applying a clamping force which clamps the upper tool by pressing an upper portion of the upper tool clamp, the clamping force applying means being provided on the holder main body;clamp operating means for transmitting the clamping force from the clamping force applying means to the upper tool clamp and for releasing the clamping force; anda wedge piece, which is engaged with the drop-prevention groove provided in the upper tool, provided on an upper portion of the engagement projection provided on the lower portion of the upper tool clamp, a force being applied to the wedge piece in a direction where it moves into engagement and out of engagement with the drop-prevention groove,wherein a groove is forced on a lower portion of the mounting plate; andwherein a pivoting prevention member which is engaged with the groove is provided on an upper portion of the upper tool clamp.