Abstract: A laser tracking device includes an adjustment device, a telescope, and a drive device. The adjustment device modifies the emission direction of first light wave. The telescope emits the first light wave in the emission direction modified by the adjustment device. The drive device rotates the telescope based on a predicted path of a moving body. The adjustment device provides more precision in modifying the emission direction of the first light wave than in the drive device rotating the telescope. Further, the adjustment device modifies the emission direction to offset the modification of the emission direction caused by the rotation of the telescope from a time when a tracking start condition is satisfied until the moving body is detected.

Abstract: A dual-purpose door system includes a door to be snugly received within an aperture of a vehicle body. The door has the lower end pivotally connected to a slide unit which is mounted upon the body and movable in an outward/inward direction and a sideward direction together with the door for thereby opening and closing the door in an ordinary mode of the system, and the upper end detachably received and guided by a guide unit mounted upon the body. The system further includes an extension board pivotally supported at its one end to the top end of the door and outwardly swingable about the one end subsequent to an outward pivotal movement of the door so as to provide an extended stepping board or path for the passengers in an emergency mode of the system. There is provided a buffer for absorbing objectionable pulses or shock loads which may be impressed upon the door and the board when they are opened in accordance with the latter mode.

Abstract: A window stay for the support of a window glass for use in vehicles, with a window frame and a glass retainer firmly secured to the window frame with the peripheral edge portion of the window glass sandwiched fluid-tight between the window frame and the glass retainer. An elastic cushioning strip encircles the peripheral edge portion of the window glass and is held in position between the window frame and the glass retainer during assembly of the peripheral edge portion of the window glass in the sandwich. To avoid relative displacement of the glass retainer, a rim projection is integrally formed with the window frame, thereby permitting the glass retainer to resist the reactive force exerted by the compressed elastic cushioning strip.