. Electric railway journal . ono Signal Contact Maker for Third-Rail Service a movable shoe, and a contact chamber containing themovable contact mechanism. The shoe is secured by apivot at one end, its other end being free to move whenoperated by the flange of the car wheel passing betweenit and the rail. The contact chamber has a pipe, which extends out fromthe bed plate to which it is secured. This pipe contains alever which fits rigidly a short distance into the outer endof the pipe, and is tapered from there to the contact cham-ber. The pipe lever, being carried loose in this manner,will n
. Electric railway journal . ono Signal Contact Maker for Third-Rail Service a movable shoe, and a contact chamber containing themovable contact mechanism. The shoe is secured by apivot at one end, its other end being free to move whenoperated by the flange of the car wheel passing betweenit and the rail. The contact chamber has a pipe, which extends out fromthe bed plate to which it is secured. This pipe contains alever which fits rigidly a short distance into the outer endof the pipe, and is tapered from there to the contact cham-ber. The pipe lever, being carried loose in this manner,will not bend when the surrounding tube is bent. Sincethe tube has one end attached to the stationary contactchamber and the other to the movable end of the shoe,it must bend whenever the shoe is actuated. The insidelever, however, will be deflected only at the small end inthe chamber, to which the movable contact is action will cause the movable contact to move from. Signal Contact Maker in Track its normal position, and thereby touch the stationary springcarrying the connecting wires from the signal box. The tube is sealed at the outer end by a cap and at theinner end by being screwed into the contact chamber withleaded threads, as for steam fitting. The cover for thecontact chamber is also screwed down with leaded threads,making it completely watertight. The operating wiresleading from the contact chamber are run through a gaspipe similarly threaded into the contact chamber andreaching underground to the signal box. The entire con-tact maker is protected by a cover which leaves exposedonly the narrow gap needed for the flange contact. The shoe has a cold-rolled, case-hardened steel wearing surface, which is interchangeable and inexpensive to re-place. The bracket extensions on the bed plate which se-cure the switch to the rail are adjustable to accommodatethe various heights of standard T-rail, and are bored andset to adjustment at the companys
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
