. Electric railway journal . bymeans of two insulated bolts through the trolley trough,and supported at the opposite end by a single bolt onwhich it is free to slide. As the trolley wheel approachesthis ear the spring provides some flexibility and preventsthe recoil of the trolley wheel which results when thewheel strikes a perfectly rigid support. Some freedomof action vertically is also given by the %-in. spaceprovided between the bolt head and the fiber washernext to the trough. Screw Ear Designed for Perfect Alignment An ear which will permit of an extra one-quarter orone-half turn in orde
. Electric railway journal . bymeans of two insulated bolts through the trolley trough,and supported at the opposite end by a single bolt onwhich it is free to slide. As the trolley wheel approachesthis ear the spring provides some flexibility and preventsthe recoil of the trolley wheel which results when thewheel strikes a perfectly rigid support. Some freedomof action vertically is also given by the %-in. spaceprovided between the bolt head and the fiber washernext to the trough. Screw Ear Designed for Perfect Alignment An ear which will permit of an extra one-quarter orone-half turn in order to make it come into perfect align-ment with the trolley wire is shown in Fig. 3. In theordinary threaded ear, it is necessary to either usespring washers or frequently to leave the ear slightlyloose in its threaded connection with the hanger in orderthat it may be straight with the wire. In this new earthe extra quarter or half turn is gained by the construc-tion at the top of the shank. Two schemes are used for %01-%Tdp. fig. 3- -TWO TYPES OF TROLLEY EARS DESIGNED TO GIVE PROPERALIGNMENT WITH THE TROLLEY WIRE accomplishing this purpose. In one case the inside ofthe shank is beveled off above the thread to give a verythin sharp edge at the top. In the other case a series ofsharp teeth are cut in the face of the shank. In eithercase the uppermost edges which come in contact with thehanger first will turn over slightly as the ear is screwedtight, thus allowing the ear to be tightened into perfectalignment with the wire. Glass-Insert Section Insulator The substitution of a glass insert for the usual fibersection is the principal feature of a new design sectioninsulator shown in Fig. 4. The method of fasteningthis glass section to the hickory block by means of clipsbolted to the block is clearly shown in the glass is cast with special holes for fastening pur-poses. The approaches on this section insulator aremade of brass castings, which are also bolted to thehickory
Size: 2771px × 902px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
