Patent ID: 6148985
Filing Date: 2000-11-21
Classification: B30B,F16P

Abstract:
A safety device for press machines including a machine housing, a power-generating device for imparting motion to a force member which moves along a first travel path starting at an initial position, the safety device comprising:a pressing part having a tool portion for accepting a forming tool, said pressing part being slidably mounted in said machine housing so as to be movable along a second travel path;a guide member disposed parallel said first travel path;an abutment member disposed parallel said second travel path and having a first surface portion parallel said guide member and disposed a first distance from said guide member;a lever part disposed between said guide member and said abutment member and having a first lever end and a second lever end disposed apart a second distance greater than said first distance, and an engagement surface proximate said second lever end;said lever part having a movable connection to said pressing part such that said second lever end is contactable with said first surface portion of said abutment member;said lever part having a movable connection to said force member such that said first lever end is contactable along said guide member;said lever part having said movable connections to said pressing part and said force member such that said force member and said lever part supports a weight of said pressing part when said lever part extends from said force member at a first angle so that up and down movement of said force member allows up and down movement of said pressing part, wherein downward force of said pressing part is substantially limited to the weight of said pressing part, and interruption of the downward movement of the pressing part by an object, in combination with continued downward movement of said force member, before said pressing part reaches a predetermined position, displaces said lever part from said first angle orientation relative to said force member to move said first lever end and said second lever end respectively into contact said guide member and said abutment member to jam said lever part therebetween thereby preventing further movement of said pressing part; andsaid abutment member having a second surface portion below said first surface portion and said abutment member being disposed such that, when said pressing part is move to said predetermined position, said second lever end is below said first surface portion and interruption of downward motion of the pressing part by a workpiece in combination with continued downward travel of said force member displaces into said engagement surface of said lever part into pivotal contact with said second surface portion of said abutment member to effect a pivot action whereby said lever part transmits force of said downwardly traveling force member to downwardly displace said pressing part to press said workpiece.