Amateur Work, Vol. 3 PDF ePub eBook

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Amateur Work, Vol. 3 free pdf Excerpt from Amateur Work, Vol. 3 In Fig. 2 is shown a knife switch drawn to a slightly larger scale than Fig.1, showing the detaits more clearly. The rails are not cut for this form of switch as in the stub switch. The outside rail b, is curved straight while the inside rail is curved to form the end of the switch, and terminates in a point at the frog in the inside rail of the adjoining track. Take a piece of rail and file the end down to a long thin point and raise the flange so that it will clear the flange of the rail against which it lays. There should be no abrupt change at this point but the tapered end should lead away from the rail very gradually for at least a distance equal to the gouge. Make two such pieces for each switch and bend one to the curve of the turnout as shown in Fig. 1. These tapered rails are connected together by tie-rods shown numbered in the figure as Nos.1, 2, 3, and 4. These tie rods may be pieces of wire soldered to the rail flange and are provided to keep the rails the correct distance apart and move them simultaneously. The rails are fastened to the ties directly beyond the last tie-rod and the further away from the point that the first fastening occurs, the more flexible will the switch be. One of the tie-rods, generally No. 1, is extended to one side for attachment to a ground lever for throwing the switch. In this case the wire may be bent down slightly to allow it to pass beneath the rail. The frog will present the greatest difficulty in construction. The joints must be made smooth and nicely tapered. Fig. 2 is an illustration of a standard frog which shows the details of construction very clearly. Instead of placing a block between the tracks as here shown, solder the various pieces to a brass plate which will make a very solid and substantial frog. Lay the frog down on paper first so as to more readily measure the tapers required and then cut the rail to fit as designed. In all frogs the gap is so proportioned that when the wheel is passing over it the tread will rest on the rail beyond before it leaves the point, thus relieving this point of the great weight which would soon smash it. Do not allow more space for the flange between the tracks than necessary. In the practical use of frogs on railroads, a guard rail is provided, lying close to the outer rail but on the inside, allowing just sufficient space between the two heads for the flange to pass. The purpose of this extra rail is to prevent the wheel slipping to one side further than it should, and climbing upon the point of the frog which would, of course derail the train. The third rail should be about 1/32" higher than the track-rail, so that the shoe will not cause a short circuit as it passes over the breaks. If care is taken in fitting these third rail sections, very small gaps can be secured and the sliding-shoe will pass over them freely in either direction. Wherever a break in this rail occurs, as at points where it crosses the track-rail and comes close to the frog, taper the ends towards the flange so that the shoe may not catch. Connect the various sections of third rail together by soldering wires thereto, so that no section will be dead when the car passes over it. It is also a good plan to connect the track rails together by soldering a wire between, at least one in each section. This will be found to materially reduce the resistance of the circuit, especially if one of the rail connections should be faulty. In Fig. 4 is shown a cross-over together with the third rail and connections. The middle block, is best made of one piece, and in the event of the crossover being made in a separate section, the piece a had better be extended to the position occupied by the ties shown. This method of construction will give support to the rails and prevent distortion should the section be lifted by one end, the design shown being intended for a permanent position. The sections of third rail b must be co.

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Details Book

Author : Unknown Author
Publisher : Forgotten Books
Data Published : 27 September 2015
ISBN : 1330289064
EAN : 9781330289068
Format Book : PDF, Epub, DOCx, TXT
Number of Pages : 356 pages
Age + : 15 years
Language : English
Rating :

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    . Excerpt from Amateur Work, Vol. 3 In Fig. 2 is shown a knife switch drawn to a slightly larger scale than Fig.1, showing the detaits more clearly. The rails are not cut for this form of switch as in