Abstract: A push-button type mechanical pencil consisting of a barrel which is composed of a clip-carrying upper barrel member and a metal tip-carrying lower barrel member, which barrel members are engaged with each other at a substantially intermediate portion of the barrel and joined to each other by a rotary unit structure so that the barrel members can be turned with respect to each other, a movable cylinder provided in the unit structure and adapted to be moved forward and backward in the axial direction owing to a screw pair, and a lead-extruding structure provided in the barrel and capable of projecting a lead in a stepped member by a very small length at a time by pressing the upper end of a push-down tube, which lead-extruding structure includes a push-button member projecting from the rear end of the barrel, a protective pipe provided in a bore at the free end of a metal tip provided at the lower portion of the lead-extending structure, and an outer tube fixed to the movable cylinder in the unit structure to

Abstract: A cleaning method for steel plates is disclosed for removing rolling oil and metal powders by spraying highly pressurized cleaning solution on both surfaces of strip steel plates immediately before and/or after the final step in the cold-rolling process of the strip steel plates. The cleaning may be performed with efficiency by mixing abrasive grains, a rust inhibitor, a surface active agent or the like in the cleaning solution.

Abstract: One side surface of a continuous metal strip is continuously brought into contacted with a surface of a molten metal bath. The surface of the molten metal bath is flowed to the directions departing from both edges of the strip by a linear induction motor dipped in the bath. A one side surface metal coated product having no deposition of a molten metal on the reverse surface is obtained by the method of the present invention.

Abstract: A fastener set comprising a bolt body, a nut and a washer which are fitted onto the bolt body. Said bolt body has a notched portion which can be broken by a predetermined torsional force. Said nut is coated by a composition containing a ester obtained by only partial esterification of a polyol having not more than twelve carbon atoms and a fatty acid or an oxy-acid. The reaction force resulted from a fastening torque applied to the nut is transmitted to the bolt body so as to break off from the bolt body a surplus portion extending above the notched portion.

Abstract: One side surface of a strip of metal is contacted with a surface of a molten metal bath which is locally raised under ultrasonic vibration whereby a continuous coating is attained on one side only.A tool for imparting the ultrasonic vibration to a bath is immersed near the bath surface and the ultrasonic vibrator connected to the tool is contained in hollow holding means dipped in the bath.In accordance with the apparatus of the present invention, the worn tool can be exchanged for a short time and the molten metallic coating on one side only of the strip of metal can be attained for a long time.

Abstract: A process of annealing for preventing temper colors on a steel sheet in a box annealing furnace, which comprises placing an oxidizable iron-base material at a position of low temperature in a circulating path of a furnace gas.

Abstract: Rust-proof lubricant compositions for coating metals comprising mono, di- or tri-partial esters synthesized from pentaerythritol and fatty acids having more than 6 carbon atoms including the corresponding isomers, or a mixutre thereof as chief constituents.