Abstract: A magnetic clamping device is provided with a magnetic force generating mechanism at which a housing cover body comprising soft magnetic material is arranged centrally at a hollow housing portion, a nonmagnetic metal frame body comprising a nonmagnetic body is made to engage with the outside circumference thereof, a plurality of arcuate nonreversible permanent magnets are arranged in annular fashion within an annular magnet housing space at the back of this nonmagnetic metal frame body, a reversible permanent magnet and a magnetic polarity switching coil disposed peripherally with respect thereto are provided at the back of the housing cover body, and a base cover body that blocks a back opening of the hollow housing portion is provided, the magnetic clamping device being characterized in that the metal frame body is joined in integral fashion to the housing cover body and the baseplate.

Abstract: A magnetic clamping device is provided with a magnetic force generating mechanism at which a housing cover body comprising soft magnetic material is arranged centrally at a hollow housing portion, a nonmagnetic metal frame body comprising a nonmagnetic body is made to engage with the outside circumference thereof, a plurality of arcuate nonreversible permanent magnets are arranged in annular fashion within an annular magnet housing space at the back of this nonmagnetic metal frame body, a reversible permanent magnet and a magnetic polarity switching coil disposed peripherally with respect thereto are provided at the back of the housing cover body, and a base cover body that blocks a back opening of the hollow housing portion is provided, the magnetic clamping device being characterized in that the metal frame body is joined in integral fashion to the housing cover body and the baseplate.

Abstract: A connecting member 1 for achieving electric conduction is composed of a contacting and surrounding portion 2 for surrounding a battery terminal B, right and left holding portions 3 confronting each other, and elastic force applying portion 5 having end surfaces to be abutted against each other. A connecting bolt 6 to be inserted into the holding portions 3 is split into two portions connected to each other, i.e. half-split members 6A and 6B and recessed inserting grooves 7 for holding a cable C and engaging means 8 to be meshed each other are defined on the surfaces of the half-split members 6A and 6B. The connecting bolt 6 is inserted into the inserting grooves 4 from the one side of the holding portions and a hut 10 is tightened to the male portion of the connecting bolt 6 projecting from the other side thereof and the cable C is fixed to an outside of the holding portions 3.