Abstract: The spool comprises, on the one hand, a working part presenting, projecting on a side element, a winding sleeve and a drive hub joined together by an annular part sectioned in S form and contractable, on the other hand, a transparent part presenting, projecting on a side element, annular elements joined together by a part sectioned as a square and likewise contractable; welds are provided between these parts and made in order not to disturb the geometry of the spool.

Abstract: The reel includes two flanges and a hub. The hub has flexible latching blades extending tangentially inside housings, with alternate blades extending in opposite directions. The hub also includes locking bars in the housings for co-operating with hooks on the flanges. The locking bars are directed in two opposite directions with the bars extending in one direction co-operating with the hooks on one of the flanges, and the bars extending in the opposite direction co-operating with the oppositely-directed hooks on the other flange.

Abstract: This invention relates to a case for containing and immobilizing a computer tape reel, wherein the cover is locked on the body of the case by a single spring catch mounted to slide in a housing in the cover and provided with a locking means cooperating with a means of the body mating therewith under the action of an elastic member, said spring catch being rendered captive by a flexible stop with inclined ramp capable of contacting a lug of the cover likewise with inclined ramp.

Abstract: The reel comprises a winding hub with a flange which presents, on the outside, a toothed ring for drive in rotation and, inside, a toothed track for immobilization, and which is provided with an overmoulded metal washer, the free edge of the hub further being centered and fixed on a second flange and the inner cavity of the hub containing a neutralizable brake normally maintained in engagement with the track and capable of being spaced apart therefrom by a pusher. The second flange comprises a coronal extension extending towards the center and imprisoning the brake in the cavity of the hub thus partially closed, brake whose axial neutralizing stroke is limited.

Abstract: The viewer is constituted by a monolithic housing in plastic material, presenting a window with side guides and an external slot for inserting the slides, said window separating a chamber closed by a lens, from a receptacle containing a source of light and its supply means.According to the invention, the supply and lighting means are re-grouped inside a removable unit, which can be extracted from the receptacle housing it and in which it is connected; said receptacle comprising opposite the lens, a reflecting surface inclined to form an angle of about 45.degree. with the optical axis.

Abstract: The invention relates to an improved platform for a camera or cine camera stand, wherein a dog gear wheel fast with the deck element cooperates with the corresponding gear wheel of the dog which is fast with a split sleeve which is mounted to slide on a shaft, fast with said deck element and free in the turret, is repelled, for mesh of the teeth of these gear wheels, by a spring abutting on a shouldered part of said shaft and is adapted to be clamped thereon by a control handle screwed in said split sleeve.

Abstract: The invention relates to a device for gripping a magnetic disk cartridge which comprises a pivot piece resting freely and selectively on the lid by one of its faces and by its rounded edge forming sliding pivot; each rod fast with the extractor plate presents in lateral projection a spindle located in a housing which is made in the pivot piece, opening in a slot and comprises an open end bearing for the spindle of the rod in question, the distance "D" being greater than the distance "d"; springs maintain the rod spindles elastically in said bearings .

Abstract: The present invention relates to a platform which comprises a turret mounted to rotate about a vertical axis with respect to foldable legs and supporting a plate fast with a shaft mounted to rotate about a horizontal axis with respect to this turret, wherein the hand lever for controlling the swivelling of the plate is foldable against the folded legs and connected to its bearing element on the platform by means of a swivelling device with built-in locking system for at least two positions of this lever.

Abstract: The present invention relates to an improved case for packing a tape cassette or the like, wherein the case comprises, on the one hand, a transparent element presenting a bottom, a rear wall and two side walls extending over the whole of its width and, on the other hand an opaque element presenting a top, a front edge portion and side walls, this opaque element comprising two portions and side walls, this opaque element comprising two portions connected together by a hinge integral with and extending in the top parallel to the front edge portion, continuing through the side walls by separating slits so that the rear opaque portion and the transparent element cooperate to form a rigid body when their side walls are connected together, while the front portion forms a cover whose side walls cooperate with those of the transparent element by elastic locking means.

Abstract: The present invention relates to a drawer unit for storing cases normally containing magnetic tape cassettes, wherein the drawer unit comprises separator partitions fast with the bottom and with the side walls thereof, and inclined downwardly to the rear and upwardly to the front, in order to define compartments in which the cases may be stored in inclined position.

Abstract: The present invention relates to a tripod with adjustable support surface for supporting various objects, wherein the stand comprises a central support provided with pivot pins for telescopic legs adapted to pivot in radial planes. According to the invention, a selection ring is mounted to rotate about the vertical axis of the support, immobilised in axial translation and limited in amplitude of rotation in order to be able to occupy at least two angular positions and this ring bears at least two sets of three stop members cooperating with end stops of the legs, these sets being offset angularly in register with the positions of the ring and defining respectively at least two different inclinations of these legs. This tripod may be used for supporting photographic, cinematographic, or video shot taking apparatus, projection apparatus, geodesic measuring instruments, antennas for emitting or receiving radioelectric waves or the like.

Abstract: The present invention relates to a process for the simplified packing of a magnetic tape for computer and to a winding core for carrying out this process, wherein the core comprises a peripheral ring and a central hub connected by a web and fast with radial ribs, then a cover of stepped section also fast with radial ribs interposed between the preceding ones, the cover being welded by ultrasounds at certain spots in the inner cavity of the unit; side elements are added and fixed on the core when the latter is filled with magnetic tape. The invention is more particularly applicable to the packing of magnetic tape for computer during manufacture and use thereof.

Abstract: A minicassette for recording tape which is constituted by a body, a cover and a tape guide all molded independently of plastic. The tape guide is positioned in the body by the cover and is of low friction anti-abrasive material molded in a mold having an interface parallel to sliding surfaces for the tape provided in the guide.