Abstract: An explosion-proof type electro-displacement converter device comprising a cylindrical first yoke attached through a permanent magnet which is at the center of the bottom of a bowl-shaped second yoke, an exciter coil winding supported elastically by springs and arranged in the magnetic path formed between the yokes, the opening of the bowl-shaped yoke is sealed by a sealing means, and an output stem linked with the exciter coil winding and projecting, leaving an explosion-proof gap, through an opening which penetrates through the bowl-shaped yoke or the sealing means.

Abstract: In a three force balanced mechanism comprising a floating pivot, an input force transmitting member, a feedback force transmitting member, one end of the input force transmitting member and one end of the feedback force transmitting member pivot in different directions, a flexible span setting member inclined with respect to the input force transmitting member, one end of the flexible span setting member being wound about or unwound from the floating pivot, there are provided detecting means for detecting the input force, restoring means responsive to the output of the detecting means for applying a restoring force to the feedback force transmitting member, and spring means for varying a force acting upon the input force transmitting member or the feedback force transmitting member in accordance with the movement of the free end of the span setting member.

Abstract: In a three force balanced mechanism of the type comprising a floating pivot, an input force transmitting member, a feedback force transmitting member, one end of these members being connected to the floating pivot and a flexible span setting member with one end secured to the floating pivot, the span setting member being inclined with respect to the input force transmitting member, the floating pivot has a cylindrical surface intersecting the two force transmitting members and one end of the span setting member is wound about or unwound from the cylindrical surface. In one embodiment the cylindrical floating pivot is formed a notch having side surfaces orthogonal to each other and the two force transmitting members are secured to respective side surfaces.