B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
153/42
B21D 5/04 (2006.01)
Patent
CA 1062136
A B S T R A C T To bend sheet material through a wide angle into an acute angle, this bending brake has a foundation carrying a stationary workpiece-clamping structure including multiple J- shaped stationary workpiece-clamping jaw supports disposed in spaced parallel relationship and carrying an elongated stat- ionary workpiece-clamping jaw. The upper portion of each such support terminates in a U-shaped cam thrust abutment engaged by an accentric movable-jaw-operating cam operatively secured to a common composite cam shaft journaled in multiple movable workpiece-clamping jaw arms with downwardly-curved rearward end portions pivotally mounted at their rearward ends upon pivot bolts carried by the upwardly-curved rearward end por- tions of the stationary supports. Secured to and extending between the forward ends of these arms is a movable workpiece- clamping jaw of wedge shaped cross-section and having a forward bending edge disposed immediately above the stationary work- piece-clamping jaw and also immediately above a so-called piano hinge which pivotally supports an elongated workpiece-bending structure movable upward and downward by one or more handles. operatively connected to the composite cam shaft adjacent the stationary supports are the inner ends of handle arms dis- posed in spaced parallel relationship and connected at their outer ends to a common cam-operating handle bar which, when swung forward and rearward, rotates the cams against their res- pective thrust abutments to move the clamping arms upward and downward so as to move the movable clamping jaw toward and away from the stationary workpiece-clamping jaw.
293480
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