. The Street railway journal . can well be understood. The apparatus is being manufactured and put on the marketby the Standard Automatic Lubricator Company, of Philadel-phia, Pa. The ** Servis Nut-Lock Of all the devices used in electric railway construction, perhapsnone has given so much trouble as an inefficient nut-lock. Withthe intention of making a lock that would fulfil the requirementsfound upon all kinds of track work, David Scrvis, the inventor ofthe Servis tie-plate, has perfected the device shown in the ac- 204 STREET RAILWAY JOURNAL. [Vol. XIX. No. 7. companying engraving. This nu
. The Street railway journal . can well be understood. The apparatus is being manufactured and put on the marketby the Standard Automatic Lubricator Company, of Philadel-phia, Pa. The ** Servis Nut-Lock Of all the devices used in electric railway construction, perhapsnone has given so much trouble as an inefficient nut-lock. Withthe intention of making a lock that would fulfil the requirementsfound upon all kinds of track work, David Scrvis, the inventor ofthe Servis tie-plate, has perfected the device shown in the ac- 204 STREET RAILWAY JOURNAL. [Vol. XIX. No. 7. companying engraving. This nut-lock has already proved itselfmost satisfactory on the many roads where it has been installed,and claims of absolute positiveness and permanency are made forit by the manufacturers. The nut-lock is placed over the bolt before screwing on thenut, the edges, which are turned over, being placed next to thefish-plate. The nut is then screwed down to position upon thelock, compressing its outer surface. When once screwed down in. IMPROVED NUT LOCK this manner, no further tightening will be required, as all straintending to loosen the nut through leverage of nut is met and re-sisted as by a spring buffer. The spring sections take off the vi-brations that would otherwise be directly on the nut, and also takeup any slack resulting from the possible wear of the parts. Thecorners of the nut, in rotating over the spring face of the lock ineither direction, must always travel from a lower to a higherplane, which prevents the loosening of the bolt. The turned-overlips of the lock, which act as spring fulcrums, and are placed out-side the path of travel- of the corners of the nut, are so related tothe spring sections under the nut converging toward the bolt thatthe spring tension of the lock can never be entirely destroyed bypressure of the nut. On the other hand, the inner path of travelof the nut enables it to be unscrewed by a wrench when desired. Thedevice is manufactured by the Eyeles
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
