Bissel

The bissel is a carrying Essieu installed on some Locomotive S, able to be directed compared to the frame to facilitate the inscription in the curves.

Description

The axle has its own frame; it is finished by a tiller connected to the principal framework by a ball joint; part of the framework is in support swivelling of spherical type on this structure. At the time of the attack of a curve, this axle is directed radially. The device is equipped with a system of recall containing Ressort S which facilitates turning circle by modification of the forces of recall on the framework. On a rectilinear way, the device remains neutral.

This device bears the name of American engineer Bissel who conceived it in 1857.

Use

The Essieu Bissel was used like axle carrying before on the locomotive with vapor intermediate size. On the largest engines, it was replaced by a carrying Bogie.

In certain cases, the tiller of the device bissel is attached not to the framework, but to the frame of the driving axle, the framework being then resting against this tiller; the unit is called bogie-bissel (for example bissel of the type “ known Zara ” in Italy under the name “ Carello Italiano ”).

With the back of the driving axles, bissel is much more often used than a bogie, because it leaves much more place for the release of the ashtray.

External bond

Diagrams of bissel
Bogie-bissel Zara

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