Abstract: A glow plug having a heat range indicated by a colored insulating ring. The insulating ring, along with first and second washers, insulates a central electrode from a glow plug body. Electrical insulation is provided by anodizing the insulating ring. A colored anodizing is used on the insulating ring which is visible from the top of the glow plug, which colored anodizing is indicative of the heat range of the glow plug.

Abstract: A glow plug having an outer body with an inner cavity having tapered sidewalls. An insulating ring having outer tapered walls is held within the body and has an inner opening also having tapered walls. A central electrode, having a tapered wall section, fits tightly in the inner opening of the insulating ring. The insulating ring and central electrode are forced under pressure in the cavity of the glow plug to provide a glow plug capable of withstanding high temperature and pressure applications without leaking.

Abstract: A glow plug has an outer body with an inner cavity having tapered, sidewalls. An insulating ring having outer tapered walls is held within the body and has an inner opening also having tapered walls. A central electrode, having a tapered wall section, fits tightly in the inner opening of the insulating ring. The insulating ring and central electrode are forced under pressure in the cavity of the glow plug to provide a glow plug capable of withstanding high temperature and pressure applications without leaking.

Abstract: A glow plug construction for use in internal combustion engines has an annular washer seated at an open upper end of an outer shell having a crimp portion extending to an upper rim. The annular washer has a ridge-like upper surface, with a preferably curved configuration. And the crimp portion of the outer shell is contouredly bent around the ridge-like upper surface with the upper rim extending past and below an apex of the annular washer. In this manner, the crimp portion exerts a substantial crimp pressure along the annular washer. Furthermore, a crimping method produces the crimped glow plug construction by gradually moving a crimping die against the crimp portion. The crimping die has a concave annular die such that, upon exertion of the preferably hydraulic crimping force, the crimp portion is plastically bent around the annular washer and the upper rim extends past and below the apex of the annular washer.

Abstract: A glow plug assembly method and construction providing a partially assembled glow plug construction having a core body positioned in a hollow plug body with insulating support elements preventing contact between the core body and the plug body. Furthermore, a bolt fastener having a head portion and a threaded shank portion is threadedly secured into the open upper end of the hollow plug body such that a flange portion of the rod-like stud, as well as the insulating support members, are clamped together in a sealing manner.

Abstract: A cargo roller for use in a roller assembly useful in aircraft or other applications where a high strength to weight ratio is important. The cargo roller includes an outer roller surface and an inner surface which includes at least one stiffening ring formed circumferencially in an inner cavity of the roller. A bearing cavity is formed at each end and preferably the entire assembly is formed from a single piece of aluminum or other appropriate material.