Abstract: An automobile roof structure includes a detachable roof section, a front roof section and a fastening device. The front roof section includes a bracket extending from the front roof section. The detachable roof section includes an aperture and is selectively mounted on the bracket. The fastening device includes a guiding member mounted on the bracket, a first engaging member and a second engaging member. The first engaging member of the fastening device is secured to the detachable roof section and is located in the vicinity of the aperture of the detachable roof section. The second engaging member is selectively inserted into both a tapered hole formed in the guiding member and the aperture of the detachable roof section. The second engaging member selectively engages with the first engaging member to position the detachable roof section properly.

Abstract: An automobile roof structure includes a detachable roof section, a front fixed roof section, a fastening device and a holding member. The fastening device includes a first engaging member and a second engaging which assist in the alignment of the detachable roof section. The first engaging member is secured to the detachable roof section and located in the vicinity of an aperture in the detachable roof section. The second engaging member is selectively inserted into the aperture of the detachable roof section and selectively engages the first engaging member. The holding member includes a first end and a second end. The first end of the holding member is secured to the front roof section, and the second end of the holding member is secured to the second engaging member. The holding member retains the second engaging member in a proper position when the second engaging member is not engaging the first engaging member.

Abstract: A vacuum interrupter includes a small-sized, light-weight, rigid coil electrode located behind a main electrode having a plurality of straight slits provided therein and extending from the periphery toward the central portion thereof, wherein magnetic field is created in a direction perpendicular to the surface of the main electrode by arc current flowing through the coil electrode, thereby causing arc produced on the surface of the main electrode to be uniformly and stably distributed, while preventing weakening of the magnetic field by arc current flowing along the surface of the main electrode and eddy current developed on the main electrode by the magnetic field.