Abstract: A seat belt drawing angle adjusting device provided on the upper end part of a seat back, comprising a housing, a seat belt retractor supported within the housing, a seat belt guide member rotatably supported in the housing and a lock mechanism for locking and unlocking the guide member. The guide member has, formed therein, a slit through which a seat belt passes from the retractor to the outside, and is so arranged as to be vertically movable, thereby allowing vertical displacement of the slit. Hence, the seat belt can be adjusted at lower or higher level in relation to its drawing point.

Abstract: A vertical carbonizing furnace for use in the production of carbon fibers is provided with a vertically extending conduit of hollow rectangular parallelepiped. The lower end of the conduit is immersed in water thereby making a water seal from environmental air. The conduit is also provided with a gas withdrawal outlet which communicates with the upper portion of the conduit through a gas feeding duct for reuse. The mixture of a vapor evaporated from the water seal and an inert gas is withdrawn from the gas withdrawal outlet and fed to the upper portion of the conduit as gas for sealing thereby preventing fibers and the conduit made of carbon or graphite from being deteriorated by said vapor evaporated from the water seal and providing a gas for sealing the upper end of the conduit.