Also orioki 折置. Method of assembly in a building's structural frame. A method of fixing a transverse beam *jōyabari 上屋梁, and a longitudinal plate or purlin *jōyageta 上屋桁, to the top of a pillar. The purlin is placed onto the the transverse beam at right angles and secured by a cogged joint *watariago 渡腮. A long, stepped tenon called *jūhozo 重ほぞ, protrudes from the top of the pillar, passes through the transverse beam and locks into the underside of the purlin. This tenon begins as a broad rectangle but is narrowed to about a third its original width as it continues through the mortise into the purlin. The top of the purlin is beveled to receive the rafters. This system is commonly used in farmhouses and merchants' dwellings *minka 民家. It was in use from the ancient period, but in the Edo period was gradually superseded by the kyōro system *kyōro gumi 京呂組, in which the position of the purlin and the beam are reversed.
