Equipment using mounting hole of ceiling as fixing element and accessory devices

A fixture to be installed in a mounting hole in a ceiling, comprising:

• a flange to be brought into contact with a front face of said mounting hole, a tubular embedded housing having an open end provided as an integral body with an inner periphery of said flange;
• a lamp casing inserted from said open end, said lamp casing including a light source setting portion, an engagement portion formed around a lower part of an outer circumferential wall of said light source setting portion and piercing holes formed in said engagement portion;
• said housing being provided with a connection means for connection to a distribution cable, said connection means being provided between said housing and said lamp casing;
• a mechanical stopping means;
• an electric wiring means including a connector connected to said stopping means;
• and
• a plurality of housing stopping mechanisms, each of which includes a support frame, a threaded shaft rotatably attached to said support frame, and a projected piece having a first end screwed to said threaded shaft and a second free end, said projected piece so arranged as to swing and at the same time to advance or retreat along said threaded shaft together with rotation of said threaded shaft, a swinging range of said projected piece being limited by contact with said support frame when said projected piece is swung by rotation of said threaded shaft to which said projected piece is attached, said housing stopping mechanisms attached to a wall of said tubular embedded housing through said piercing holes by means of an operation tool in such a manner as to permit said threaded shafts to rotate.