| 摘要 |
PURPOSE:To prevent the loss of exciting force, by placing an endless track on the circumferential surface of a cylindrical roller, which is provided to the upper end of the piston of an exciting cylinder through a spherical bearing so as to be supported in a freely swingable and rotatable manner, to prevent said endless track from receiving excessive force. CONSTITUTION:Roller supports 11, spherical bearings 14 and needle bearings 15 are provided to the support shafts 13 fixed to the upper ends of the pistons 2 of a plurality of exciting cylinders 1 to support rollers 12 in a freely swingable and rotatable manner. In the next step, a plurality of exciting cylinders 1 are arranged at predetermined intervals and an endless track 6 is placed on the circumferential surfaces of the rollers. When an exciting signal is applied to the exciting cylinders 1, the pistons 2 are reciprocally moved to transmit exciting force to the roller supports 11, the support shafts 13, the needle bearings 15 and the spherical bearings 14, and wheels 4 and a chassis 10 are moved up and down through the endless track 6. In this case, the endless track 6 is supported by the rollers 12 so as to be tangentially contacted with the circumferential surfaces thereof and is subjected to no excessive force. |
