A guide rail fixing device that can increase frictional force against a guide rail without increasing the number of brackets installed on an inner wall of a hoistway. The guide rail fixing device includes: a rail bracket in contact with a bottom face of a base of a guide rail placed in the lowest portion out of multiple guide rails arranged in line in an elevator hoistway; a rail clip to clamp the base of the guide rail in cooperation with the rail bracket; and a friction plate which is in contact both with the bottom face of the base of the guide rail placed in the lowest portion and in contact with an upper end of the rail bracket, to clamp, in cooperation with a rail clip, the base of the guide rail placed in the lowest portion.

Guide rail fixing device

PURPOSE:To prepare nitrogen-containing compounds such as gamma-collidine, easily, by reacting 2,2,6,6-tetramethyl-4-hydroxytetrahydropyran etc. which are by-products in the preparation of methyl isobutyl ketone from acetone, with NH3. CONSTITUTION:2,2,6,6-Tetramethyl-4-hydroxytetrahydropyran (TTPH) or 2,2,6, 6-tetramethyl-4-oxotetrahydropyran (TTPK), is made to react with NH3 in the presence of a catalyst, such as I or VIII group metals in the periodic table, their compounds or Lewis acid nonmetallic compounds, at 300-400 deg.C when a raw material is TTPH, or at 230-450 deg.C when that is TTPK, to give gamma-collidine. When the reaction temperature is 200-360 deg.C, 2,2,6,6-tetramethyl-4-piperidone is obtained.

Yasuda Masaaki

Papers

Preparation of nitrogenncontaining compound