Abstract: A lamp including a glass envelope having a base fitted at each end portion thereof. Each lamp base includes a metallic base shell having an annular flange. The annular flange is heated prior to fitting over the end portion of the envelope so as to increase the inner flange diameter. Cooling of the annular flange after fitting reduces the flange diameter thereby providing an interference fit with the end portion. The lamp base is retained on the end portion without the need for basing cement. In order to accommodate variations in the diameter of the lamp seals, an annular rib is formed on the inner surface of the flange. After cooling, the annular rib forms an interference fit with the lamp end portion.

Abstract: A method for manufacturing a lamp including a glass envelope having a base fitted at each end portion thereof. Each lamp base includes a metallic base shell having an annular flange. The annular flange is heated prior to fitting over the end portion of the envelope so as to increase the inner flange diameter. Cooling of the annular flange after fitting reduces the flange diameter thereby providing an interference fit with the end portion. The lamp base is retained on the end portion without the need for basing cement. In order to accommodate variations in the diameter of the lamp seals, an annular rib is formed on the inner surface of the flange. After cooling, the annular rib forms an interference fit with the lamp end portion.