Patent ID: 7360390
Filing Date: 2008-04-22
Classification: B21D,B25B,Y10T

Abstract:
1. A method for securing a corner connector within a transverse duct flange of a rectangular duct section, said method comprising: placing first and second legs of the corner connector within first and second adjacent flange portions of the rectangular duct section, each of the flange portions including a transverse portion and an upstanding lip, the transverse portion extending transversely between a wall of the rectangular duct section and the lip; providing a crimping tool of a type having a head defining a generally rectangular jaw opening sized to receive the transverse duct flange, the head having an inner jaw member, an outer jaw member in spaced-apart, facing relation to the inner jaw member, and an intermediate jaw member extending between the inner and outer jaw members, said inner and outer jaw members spaced apart by a distance which is approximately equal to a transverse extent of the transverse portion of the transverse duct flange, a first handle extending from the head, a second handle pivotally attached to the head and movable between a first, open position and a second, closed position, a plunger slidably received within a plunger orifice formed within the inner jaw member and mechanically coupled to the second handle wherein pivoting movement of the second handle from the open position to the closed position causes sliding movement of the plunger from the inner jaw member toward the outer jaw member, the plunger completely received within the plunger orifice when the second handle is in the open position providing a clearance for the transverse duct flange to enter the jaw opening until the transverse portion of the transverse duct flange is fully seated within the generally rectangular jaw opening, the plunger and plunger orifice positioned within the inner jaw member so as to be adjacent the lip portion of the transverse duct flange when the transverse portion of the transverse duct flange is fully seated within the generally rectangular jaw opening, and the plunger and plunger orifice further positioned so that movement of said second handle from the open position to the closed position will cause the plunger to exit the plunger orifice and slidingly move to act on the upstanding lip without acting on the corner connector when the transverse duct flange is fully seated within the jaw opening; and for each corner connector leg, seating the transverse duct flange into the jaw opening and moving the second handle to the closed position relative to the first handle so as to cause sliding movement of the plunger member transversely toward the outer jaw member, thereby bending a portion of the upstanding lip over an aligned portion of the corner connector leg.