Abstract: A combined casing and mounting assembly for a descent device to be contained by the assembly when not in use and to be suspended from the assembly when in use includes an enclosed hollow casing which has a rear panel to be fixed to a wall of a building, a side panel having one edge hinged to the rear panel, and a cover panel hinged to another edge of the side panel opposite the rear panel. The side panel and the cover panel can be turned from an enclosing storage position relative to the rear panel to an open position in which the cover panel extends through an opening in the wall. The descent device is to be suspended from the cover panel of the assembly when in use. The assembly further includes a positioning device to maintain the cover panel in the openn position and a fastening device to maintain the cover panel in the storage position.

Abstract: A device for positioning a rotary member at a desired angle relative to a fixed member includes a first shaft sleeve mounted in the rotary member, and a second shaft sleeve mounted in the fixed member adjacent to and axially aligned with the first shaft sleeve. The first and second shaft sleeves have a plurality of inward and axially extending clutch teeth notches. A shaft member has a first section slidably mounted in and extending through the first shaft sleeve, a second section slidably disposed in the second shaft sleeve, and a central section connecting the first and second sections and having a plurality of axially extending and outwardly projecting clutch teeth protrusions. The shaft member is slidable between the first and second shaft sleeves to interengage or disengage the first and second shaft sleeves.

Abstract: A knuckle joint in which a first piece with an eye enters a jaw between two corresponding projections of a second piece having a first and a second eye respectively formed therein, and is retained by a pin member, wherein the pin member comprises a pin having a first end with a button fixed thereat and a second end. The pin passes through the eye of the first piece, which then retractably protrudes the button out from the first eye of the second piece and extends the second end to a position near the second eye of the second piece. A stopper has a protrusion which is passed through the second eye of the second piece, extending into the eye of the first piece, and joined with the second end of the pin. A slide block is passed through by the pin and inserted within the eye of the first piece, retractably protruding into the first eye of the second piece.