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1894 Article-G. A. Crosby & Co., Crosby Power Press |
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Iron Age, V54, 06 Dec 1894, pg. 1003 |
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3/1/2017 1:15:55 PM |
THE CROSBY POWER PRESS
A new back geared, straight lined power press adapted for cutting out large articles in tin, brass, copper, sheet iron, steel, &c., has been brought out by G. A. Crosby & Co. of Chicago. The shaft is made of steel and has journals each side of the crank to prevent springing. The gears are all cut and have broad and large teeth. The cross head runs in V bearings, which are made adjustable for wear. The pitmans are made with broad bearing surfaces and are adjusted by means of a cross shaft, which is provided with a gear and pinion at each end that are closely fitted, so there is no back lash. This permits of adjusting both pitmans exactly alike. The press is provided with an automatic brake designed to prevent the sudden reverse motion, which would otherwise be communicated to the cross head when operating dies which are constructed with powerful steel or rubber springs under the lower die. Unless overcome or balanced in some manner, the cross head, after being released from the pressure of the downward stroke, would be driven up so forcibly as to oftentimes break or derange the mechanism of the clutch, or, carrying it past the highest point before the clutch had caught on, allow it to descend again by its own weight, making accidents much more liable to occur. This brake acts only at the time required to prevent a sudden acceleration in the motion of the cross head that is, from the time the punch and cross head start upward until the punch leaves the drawing ring, which is usually about one-quarter of a revolution of the shaft, thus leaving about three quarters of the revolution of the shaft open or free from friction or use of power. The press is so arranged that it may be taken apart to facilitate transportation, handling and setting up. The main dimensions of the press, which is built by G. A. Crosby 8:. Co. of Chicago, are: Opening in bed (varied as desired), 20 x 43 inches; distance between uprights, 63 inches; distance from bed to bottom of slide, when latter is up, 9½ inches; motion of slide (as desired), 3 inches; adjustment of slide. 4 inches; weight complete, about 18,500 pounds. |
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1894 G. A. Crosby & Co., Crosby Power Press
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