Abstract: A top-blowing lance nozzle is configured to freely switch an adequate expansion condition so as to control an oxygen-blowing amount and a jetting velocity independently of each other without requiring a plurality of lance nozzles or a mechanically movable part. A lance nozzle is configured to blow refining oxygen to molten iron charged in a reaction vessel while a gas is blown from a top-blowing lance to the molten iron. One or more blowing holes for blowing a working gas are on an inner wall side surface of the nozzle, at a site where the lance nozzle has a minimum cross-sectional area in a nozzle axis direction or at a neighboring site of the site.

Abstract: In a lift-up buckle device, a worm wheel is engaged with a screw drive. When a worm is rotated in a forward direction and causes the screw drive to move downward, the worm moves the worm wheel downward. On the other hand, when the worm is rotated in a reverse direction and causes the screw drive to move upward, the worm moves the worm wheel upward. Consequently, the worm wheel may be stably engaged with the screw drive, and the worm wheel and worm may be stably mated.

Abstract: In a lift-up buckle device, a worm wheel is engaged with a screw drive. When a worm is rotated in a forward direction and causes the screw drive to move downward, the worm moves the worm wheel downward. On the other hand, when the worm is rotated in a reverse direction and causes the screw drive to move upward, the worm moves the worm wheel upward. Consequently, the worm wheel may be stably engaged with the screw drive, and the worm wheel and worm may be stably mated.

Abstract: A finger mechanism includes a base portion and a plurality of finger portions supported by the base portion, wherein each of the finger portions includes a first bone member, a second bone member rotatably coupled to one end portion of the first bone member, and a pair of third bone members each being rotatably coupled to another end portion of the first bone member and the base portion, and forming a parallel link mechanism between the first bone member and the base portion.

Abstract: A finger mechanism includes a base portion and a plurality of finger portions supported by the base portion, wherein each of the finger portions includes a first bone member, a second bone member rotatably coupled to one end portion of the first bone member, and a pair of third bone members each being rotatably coupled to another end portion of the first bone member and the base portion, and forming a parallel link mechanism between the first bone member and the base portion.