Safety device for mechanical eccentric cam presses
OwnerRenzo Ciprianiinventor
Life of this patent
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Abstract
A safety device for a mechanical cam press having a ram attached to a vertically extending shaft arranged for reciprocating movement and utilizing a brake and clutch for controlling the reciprocating strokes of the cam, the shaft including a stepped edge engageable by a pair of retractable slides arrange for horizontally reciprocating movement to retain the shaft and therefore the ram in the top, dead center position against downward movement toward with switch means actuated by a tripping device responsive to an inadvertent downward movement of the shaft from the top, dead center position to thereby engage the brake and disengage the clutch for avoiding injury to the operator.
Claims9
A safety device for a mechanical cam press including a frame and a ram having dies arranged for vertically reciprocating strokes comprising, in combination, a vertically extending shaft, a double acting hydraulic cylinder having a piston rod connected at its upper end to the lower end of said shaft and at its lower end to the ram of the press whereby said shaft, said cylinder, and piston rod and said ram move together reciprocally as a unit, said shaft having a portion of reduced diameter forming a stepped edge, a pair of opposed, independent, horizontally moveable slides arranged for reciprocating movement between an advanced position and a retracted position, a pair of pneumatic cylinders operated by control means, means for connecting each of said pneumatic cylinders to one of said slides for moving the said slides reciprocally in opposite directions, said slides in said advanced position having a portion in underlying relationship with said shaft stepped edge with a clearance of a few millimeters in the top, dead center position of said shaft to thereby prevent the inadvertent downward movement of said shaft and therefore said ram by engagement between said stepped edge for said portions of said slides;
- and an interlock means, releasably engageable with said shaft fo retaining said shaft in an initial position to permit vertical adjustment of said ram.
A safety device for a mechanical cam press including a frame and a ram arranged for vertically reciprocating strokes comprising, in combination, a vertically extending shaft, a coupling mounted on the lower end of said shaft, a connecting shaft having an upper end portion readily engageable within said coupling, an intermediate splined portion and a lower end portion of enlarged diameter, a strip fixed on said ram, the portions of said connecting shaft extending out of said coupling being disposed within said strap, a motor on said strap, means for driveably connecting said motor to said splined portion of said connecting shaft for rotation in one direction to disengage said connecting shaft from said coupling and permit said strap to freely follow the adjusting travel of said ram and for rotation in the other direction to threadedly connect said connecting shaft to said coupling and limit switch means for terminating the rotation of said connecting shaft in said other direction when said connecting shaft lower end portion of enlarged diameter reaches a predetermined position in said strap, said vertically extending shaft having a portion of reduced diameter forming a stepped edge, a pair of opposed, independent, horizontally movable slides arranged for reciprocating movement between an advanced position and a retracted position, a pair of pneumatic cylinders operated by control means, means for connecting each of said pneumatic cylinders to one of said slides for moving the said slides reciprocally in opposite directions, said slides in said advanced position having a portion in underlying relationship with said vertically extending shaft stepped edge with a clearance of a few millimeters in the top, dead center position of said vertically extending shaft to thereby prevent the inadvertent downward movement of said vertically extending shaft and therefore said ram by engagement between said stepped edge for said portions of said slides, an interlock means, releaseably engageable with said vertically extending shaft for retaining said vertically extending shaft in an initial position to permit vertical adjustment of said ram.
Dependencies are inferred from the claim text.