Abstract: An improved metal-to-metal seal of a generally U shaped configuration which utilizes an enlarged seal portion on the interior and exterior of the inner and outer seal legs to effect an initial seal. The initial interference of the seal legs is maintained by disposing a solid support ring in the annulus between the seal legs with holes in the support ring to prevent pressure lock and to balance pressure distribution within the seal. The invention is shown in a unidirectional form with a single pair of seal legs extending axially from an annular base and in a bidirectional form with a pair of seal legs extending axially in both directions from an annular base. An alternative form of the invention discloses a support member of U shaped configuration which allows greater flexibility in the seal legs while maintaining initial sealing contact. This support member also has holes to prevent pressure lock and to balance pressure distribution within the seal.

Abstract: A miniature electrical fuse has electrical lead wires (8) to permit the fuse to be connected into a circuit without use of a fuse holder. Wires (8) are resistance welded to electrically conductive end caps (4) closing off the end of a non-conductive tubular housing (3) containing a fusible element (1). Element (1) is connected to the caps (4) by solder joints (7) and caps (4) are connected to housing (3) by solder joints (6). The solder is a lead/tin alloy of high melting point. The end walls of the caps (4) are comparatively thick in relation to their side walls in the range 1.3 to 1 and 2.1 to 1.

Abstract: An improved low voltage igniter of the type having an annular spark gap between a center electrode and annular ground electrode which is arranged coaxial with the center electrode. The spark gap is shunted by an insulator surface. Semiconducting material is deposited on the insulator surface as one or more rings which are coaxial with and spaced from the electrodes. The semiconducting rings reduce the voltage required to initiate a spark across the spark gap.