Abstract: A flameless heater for operator's cab having automatic heat control. A hydraulic pump provides pressurized fluid which flows through a fluid restrictive orifice to produce thermal energy and raise fluid temperature as a result of a drop in hydraulic pressure. The heated fluid flows through a heat exchanger where a fan blows air over the exchanger to provide hot air for the operator's cab. A spool valve connected in parallel with the orifice bypasses fluid around the orifice to limit the rise in fluid temperature. A temperature sensor selectively opens and closes the spool valve to keep fluid temperature within a high temperature limit and a low temperature limit.

Abstract: An aerial platform attachment for a crane having an extensible boom including a basket pivotally suspended from the boom tip. A loop on the bucket is engaged by a projection secured to the boom when the bucket is pivoted adjacent the boom and the boom is then fully retracted. A brake which is applied by a hand lever movable in either direction from a central release position locks the bucket relative to the boom when in a working position.

Abstract: This invention relates to aerial platforms capable of accommodating two occupants, and more particularly, to such devices which are especially suited for use with a hydraulic crane.