. Amerikanischer Ingenieur und Eisenbahn-Zeitschrift. D durch die brakeshoes zur Drehung der Räder wird das gleiche nach jedem Paar Räder sein. Sind die Bremsenbügel jedoch ausreichend zur Tangente in der Mitte des Bremssockers geneigt, so wird der Reibungswiderstand der Bremsenbügel zur Rotation des vorderen Radpaares erhöht, während die Widerstände zur Rotation der Hinterräder nur nominal sind. Es wird beobachtet, dass, wenn, in Abb. 4, die Räder drehen in die entgegengesetzte Richtung, durch Bewegung des Autos in der entgegengesetzten Richtung, was als das Heck
1742 x 1435 px | 29,5 x 24,3 cm | 11,6 x 9,6 inches | 150dpi
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. American engineer and railroad journal . d by the brakeshoes to the rotation of the wheels willbe the same upon each pair of wheels. If, however, the brakehangers be sufficiently inclined to the tangent at the center of thebrakeshoe, the frictional resistance of the brakeshoes to the rota-tion of the forward pair of wheels will be increased, while the re-sistance to the rotation of the rear wheels will be merely nominal. It will be observed that, if, in Fig. 4, the wheels rotate in theopposite direction, through motion of the car in the opposite di-rection, what has been considered the rear pair of wheels will nowbecome the forward pair. At the same time, also, the effect of theinclined bangers upon the two pairs of wheels has been reversed, so that it is still, under the changed conditions, the leading pairof wheels which is subjected to the greatest breakshoe pressure, and^the rear pair of wheels which is stbjected the reduced pressure.Here, then, is a method of utmost simplicity which fulfills the re-quirements of the case.. A most important feature of this method will, doubtless, nothave escaped observation. This feature consists of the fact thatthe conditions prevailing in Fig. 4 are those for brakes which arehung between the wheels. As a foremost consideration it is neces-sary, in order to realize the advantage of the principle of inclinedbrake bangers, that the brakes shall be inside hung. It has beenthe practically universal custom to suspend the brakebeams ofpassenger trucks outside of the wheels. This is radically wrong ifproper efficiencv of the brakes is desired. The most important ad-vantage [of inside hanging] is that the brakeshoe pressure uponthe different pairs of wheels may be so proportioned that in anemergency application of the brakes trains may be stopped in from10 to 15 per cent, shorter distance without any increased liabilityof injurious wheel sliding. This advantage is, of itself, so im-portant as to overshadow all objections. Another impor
