Abstract: A hot-air heater, especially for vehicles, having a burner disposed in a housing, a fuel supply means for delivering fuel to the burner and a combustion-air fan for feeding combustion-air to said burner. Combustion-air, exhaust-gas and heating-air ducts are constructed within the housing. The housing has an opening for providing access to at least one space in which adjustable and/or replaceable parts are situated, the space being closable, relative to the outside of the heater, by means of a housing cover, and being connected to at least one of the combustion-air and exhaust-gas ducts. For reasons of safety, a combustion-air exhaust opening is provided on the pressure side of the combustion-air fan, which is blocked only when a housing cover for the housing access opening is in place, and being dimensioned in such a way that, when the combustion-air exhaust opening is not blocked, sufficient combustion-air is exhausted therethrough such that operation of the heater is not possible.

Abstract: A drive arrangement for a movable panel member of a vehicle includes a rotatable driving member such as a drive pinion, which member is supported upon a shaft that is drivingly connected to a crank member so as to enable rotational movement of the crank to be transmitted to the pinion. To enable rotation of the crank to a stowage position in any panel member location, a lost motion device is provided for permitting substantially 360.degree. of relative rotation between the crank and the pinion without rotation of the pinion. According to preferred embodiments of the invention the lost motion device is formed by a free travelling member being disposed between either the crank and the shaft or between the shaft and the pinion in the form of a ball contained in a pair of grooves, one of which is helical and the other of which is straight.