Abstract: Ultrasonic leak detection apparatus which includes a cycloidal transfer mechanism for sequentially feeding a plurality of workpieces to a test station. An elevator at the test station alternately lifts workpieces in sequence to an elevated position to a test chamber and lowers workpieces from the test chamber to the transfer mechanism. An enclosure cooperates with the elevator to form the test chamber in which the workpiece is pressurized and microphones detect any leakage of air through cracks or the like. A reject station downstream of the test station includes facility for removing defective workpieces from the transfer line.

Abstract: A die lifter rail adapted to be inserted into the open end of a conventional inverted T-slot in the bolster plate of a press has a narrow support bar dimensioned to extend lengthwise within the narrower stem portion of the T-slot and a plurality of sets of vertically stacked Belleville springs spaced lengthwise of the support bar and resiliently supporting it for vertical movement. The Belleville springs have a diameter substantially greater than the width of the support bar and corresponding generally to the width of the wider base portion of the t-slot. Studs extending vertically upwardly through the Belleville springs have a sliding fit with bores in the support bar to guide its vertical movement. A plurality of longitudinally spaced rollers are journalled in the support bar and project above the upper face thereof to support a die for sliding movement on the press bolster plate.