Apparatus fixture device and an installation method for fixing an apparatus

An apparatus fixture device for fixing an apparatus to an apparatus installation opening of a space in a ceiling portion of a vehicle, the fixture device comprising:

• at least one pair of rails, for being installed near the apparatus installation opening of the space in the ceiling portion, for carrying a load at when the apparatus is installed, each rail having an internal space therein and also having an opening groove being open outward front said internal space and a pair of rack portions, one rack portion formed on each side of the opening groove,
• a block of said fixture device, having loose-fitting holes in a vertical direction and having an upper width suited so that the upper portion is inserted into said opening groove,
• bolts loosely fitted into said loose-fitting holes of the block of said fixture device,
• a loose-fitting cylinder having a predetermined length, loosely fitted between the external circumference of said bolt and said loose-fitting hole,
• nut plates having a nut hole to be screwed with said bolt, and the nut plates having a length longer than the width of said opening groove and having a width smaller than the width thereof, when the bolt is turned by substantially 90° around an axis of the bolt while said bolt is pushed upward after insertion by lift into the space in the rail through said opening groove, both end portions extend across said opening groove are placed on said pair of rack portions, and pulled downward by a tightening force owing to the rotation of said bolt screwed into said nut hole, thereby firmly making contact with said rack portions of the rail and fixed thereto,
• a fixing member for engaging the apparatus to the block of said fixture device, and
• indication means for indicating an improper fixing by causing a rattle, the indication means having a predetermined dimension in the axial direction of the bolt when the bolt is tightened at an improper position wherein said nut plate does not properly make contact with said rack portions of said rail in said ceiling portion of the vehicle,
• wherein the length of the bolt and the dimension of the block are selected so that a clearance Z for providing a predetermined rattle occurs between the integration of said bolt passing through a predetermined washer, a spring washer and a cylinder having a predetermined length, said nut plate and a nut fastened to the bolt in advance and the lower predetermined portion of the block of said fixture device.