Improvements in Appliances for Extracting or Inserting Studs of Driving Chains.

摘要

17,825. Carter, A. E., and Renold, Ltd., H. July 28. [Cognate Application, 21,652/14.] Rivet &c. extractors.-In tools for extracting and inserting the studs of driving and mortising chains, forked arms are provided for holding up the chain by engaging beneath the link-plates on one side thereof so that the breadth of the chain hangs downwards from the arms while the studs are being forced out. The forked arms b may be pivoted at j, Fig. 4, to the cramp c so that they can be swung out to receive the chain and then replaced beneath the screw d by which they are removed. According to modifications, the fork may be integral with the cramp c and project therefrom, or a number of forks b, b1, b11, Fig. 5, of different sizes may be rotatable about a stud l so as to be interchangeable. The ends of the forks are supported by a shoulder o of the cramp when in use, the forkcarrier k having to be slid back on the pin l before it can be rotated. When studs are to be inserted, the links are placed on a table a, Fig. 4, having a groove n which allows the ends of the studs to project through the link; or they are placed upon parts of the forks b, b1, b11, Fig. 5, of suitable dimensions. In operating upon mortising-chains the two studs of a link must be removed simultaneously to avoid bending the link-plates, and a slide carrying two stud-extracting prongs is mounted upon the cramp and is depressible by a screw or other device, and the chain-supporting fork is shaped to accommodate the tooth on the outer link. An additional support for mortising-chains comprises a ledge on the cramp adapted to support the projecting back portion of the link. The stud-extracting stem may be forced down by means other than a screw, for example a lever-operated cam, and the interchangeable supports may be movably arranged in other manners. According to a further modification, the cramp is formed like a pair of pliers, having two jaws, s, t, Fig. 6, so connected to the operating-levers as always to remain parallel. Fork-slots b, b1, &c. are formed in the jaw s, and corresponding thrustpins d, d', &c. are fixed in the jaw t.