. Electric railway journal . rake rigging, the method generallypreferred is to make the layout with the brakes inrelease position, the positions assumed by the partsconcerned, when the brake is applied both with new andworn-out shoes and also when the piston travel has itsmaximum possible value (which is usually 12 in.), be-ing carefully laid off, to make certain that no obstruc- point R has traveled the required 5 in., as shown, thelever assuming the position EQF. The distance h,which locates the release position of the lever EF, isfo und by aid of the rule for lever motion as follows: 16 & =
. Electric railway journal . rake rigging, the method generallypreferred is to make the layout with the brakes inrelease position, the positions assumed by the partsconcerned, when the brake is applied both with new andworn-out shoes and also when the piston travel has itsmaximum possible value (which is usually 12 in.), be-ing carefully laid off, to make certain that no obstruc- point R has traveled the required 5 in., as shown, thelever assuming the position EQF. The distance h,which locates the release position of the lever EF, isfo und by aid of the rule for lever motion as follows: 16 & = g- X 5 in. = 10 in. and as the rod SN has assumed the position FH, thelever GNP has swung into the position GHK, the dis-tance c being approximately equal to h; that is, c = 6 = 10 in. Consequently the distance d, which locates the releaseposition of the lever GK, is found as follows: 25 25d = X c = X 10 in. ^ 16 ;i in. Moreover, the proper length of the rod FH or SNshould be just 37 in., as may be seen by an inspection. tions to the proper motion of these parts will be order to accomplish this, and also to determine therelease positions which the various parts should have(as well as the lengths of tie rods, etc.), so that themain levers may stand at right angles when the brakeis set and the piston travel has its standard value, it ismerely necessary to apply the rule previously given forthe motion of levers, etc. The following examples willillustrate the general methods employed for this pur-pose : Let it be required to find the release positions of thetwo hand-brake multiplying levers applied to an electriccar on which the piston travel is to be 5 in., if theselevers are to stand at right angles to the center line ofthe car when the hand brake is fully applied. Thedimensions and general location of these levers areshown in Fig. 7. The points E and G are fixed. The first step is to dravv the lines ES and MPthrough the points, E and G, so that they are per-pendicular to
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