Importance

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Abstract

An aerial apparatus swingable outwardly of a fire truck chassis is stabilized by outriggers on opposite sides of the chassis with the aerial apparatus being swingable to one side or the other only if an extendible section of an outrigger for that side has been moved relative to its base section from a storage position to a fully extended outrigging position on that side. The swinging of the apparatus to a side of the chassis is enabled by withdrawing stop means which is spring urged into the path of rotation of the apparatus to that side. The withdrawal of the stop means is actuated mechanically by means on the extendible section engaging and moving an actuating rod carried by the base section for the extendible section to effect operation of a linkage to withdraw the stop means against its spring bias. On retraction of the extendible section from its fully extended position, the spring urged stop means resets as the extendible section leaves the fully extended position. The base and extendible section are moved vertically about a pivot by hydraulic means having a stroke such that the outrigger may also be used as a jack which engages the ground close to the chassis.

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First Claim