Abstract: A combination of an engine block heater and electrical coupling includes the conventional cylindrical insert which slides into a sleeve on the mounting member for the block heater. An additional spring clip member is provided to hold the electrical coupling in place. The spring clip member has a collar surrounding a rib on the connector body and a pair of spring arms extending at right angles to the collar along a sleeve of the coupling to snap behind a rib on the sleeve. The spring clip arms are connected to the collar at an outer edge thereof with a pair of lobes of increased diameter between the spring clip arms for pushing of the collar longitudinally. A central opening of the collar engages over the connector body with a pair of inwardly projecting portions which slide along slots to a groove at the rib on the connector body.
Abstract: A heating element for an air flow comprises a channel shaped bracket including a base and side walls at right angles thereto within which is mounted a pair of mica sheets arranged parallel to the base and at right angles to the sides and connected to the sides by ribs longitudinally of the sides with transverse slots within which the sheets slide. Each sheet is wrapped with a heating wire formed into helical coils so that each side of the sheet carries a plurality of parallel helical coil portions with connecting portions wrapped over the edges of the sheet. The sheets are symmetrical and one is inverted relative to the other. Each sheet carries at ends thereof a male and a female connector of the blade and receptacle type so that the blade of one sheet engages into the receptacle of the other sheet.