Abstract: An open/close control system for an inspection lid adapted not to open while a vehicle travels. The open/close control system has emergency release means which disables power transmission of drive means for opening and closing a side entrance/exit door of a railway vehicle. The emergency release means is installed in a space inside a wall surface inside the vehicle, and the space can be opened and closed by the inspection lid. The emergency release means has locking devices provided in the space inside the wall surface in order to restrict rotation of the inspection lid, and also has an open/close controller for detecting traveling of the railway vehicle to actuate the locking device.

Abstract: A pile driver includes a leader rotation/holding mechanism that can firmly hold a leader in a rotatable state and also reliably rotate the leader using a general-purpose, inexpensive hydraulic motor by keeping the hydraulic motor from action of a bending moment from the leader. The pile driver has a leader revolver 15 that includes a mechanism for rotating a leader 17. The leader revolver 15 includes a fixed-side outer tube 31 and a rotation-side inner tube 32 that is concentrically arranged inside the fixed-side outer tube 31 via a pair of tapered roller bearings 35, 36 provided at two upper and lower positions. A lower part of the leader 17 is connected, in an integrally rotatable state, to an upper part of the rotation-side inner tube 32 protruding upward from an upper end opening of the fixed-side outer tube 31. A hydraulic motor 33 is placed in a lower part of the leader revolver 15.

Abstract: A corridor apparatus of an articulating section for use in articulated cars comprises: a pair of rectangular outer corridors respectively provided to end surfaces of car bodies to be articulated, in such a manner as to project therefrom and surround corridor entrances of the car bodies; a pair of rectangular inner corridors each adapted to partially fit with each of the outer corridors in a connected manner; and a pair of gate-shaped inner frames each connected to the other end of each of the inner corridors, the inner frames being fitted with each other such as to be swingable in the direction of the articulating section's corridor with lower ends thereof as a supporting point, wherein the rectangular outer corridors, the inner corridors, and the inner frames constitute peripheral walls of the articulating section's corridor, fitting portions of the outer corridors and the inner corridors are arranged to be rotatable around a center point of the articulating section's corridor, coupling portions of each of t