GB190908039A - Improvements in the Manufacture of Spiral Springs and in Machines and Appliances Employed therein. - Google Patents

Abstract

8039. Cowen, G. H. April 3. Coiling.-In making coiled spiral springs for buffers, gun recoils, &c., the end of the spring which is distorted in the coiling operation by attaching it by a key &c. to the coiling- mandrel, is forced into position concentric with the body of the spring by an auxiliary machine, which, if desired, may be adapted to the coiling-machine. The use of this machine may dispense with reheating of the spring. The other end of the spring may also be finished in this machine or may be finished by rollers, levers, tongs, &c. in the coiling-machine. The spring f is clamped by a plate-dog, bolt, &c. g, carried by a chuck c on the driving-spindle of a single, double or triple-geared headstock b, to a slightly tapered mandrel d, and the end f<1> of the spring is finished by a roller m carried on a plate l, which is adjustably mounted on an adjustable socket o in a back headstock p. The mandrel is rotated, and the back headstock p is traversed by a rack and pinion, the pinion being held in position by a pawl on the shaft v. The mandrel passes through holes in interchangeable plates n on the plate l, and the spring f is compressed to remove kinks, while the end is being finished. A thrustblock may be inserted behind the chuck to take pressure off the headstock. For bending powerful springs, the socket o may be movable in the back headstock by a screw or piston operated by steam, water, &c., and the chuck c may carry a spring compressed during the operation, for the purpose of removing the spring l from the mandrel. For heavy springs, the mandrel d may be geared to recede into the hollow lathe spindle, and the spring may be removed by mechanical means.