Film core with restrainer

#The present invention is generally directed to an improved core for holding web material and in particular to a core for holding film within a film cartridge.

#Cores for holding web material are well known in the art with such devices finding considerable application in film cartridges for microfilm readers.

#In the use of film spools, for example, it is customary to wind film upon the spool by positioning one end of the film through a slot formed in the hub so that the film end may be at least momentarily held while the first few strands of film are wound.

#The features of the present invention which are believed to be novel are set forth with particularity in the appended claims. The invention, together with further objects and advantages thereof, may best be understood by reference to the following description taken in conjunction with the accompanying drawings, and in the several figures of which like reference numerals identify like elements, and in which:

#FIG. 1 is a top view of a core for holding web material embodying the present invention; and

#FIG. 2 is a cross section of view taken along lines 2--2 of FIG. 1.

#In the drawings, a film-holding reel 10 of known construction, rotatably about an axis 15, contains a core which comprises a cylinder 20, a rectangular collar 22, an annular floor 24, between the cylinder and rectangular collar, tapered rib members 28, 30, 32, and 34, post 26 and channelled wall member 36.

#The cylinder 20, is adapted to be received into film-holding reel 10, so as to confine the novel core as it rotates about its axis of rotation 15. In conventional manner, the core of FIGS. 1 and 2 is adapted to be driven by a keyed spindle and accordingly, rectangular collar 22, includes a keyed recessed portion 38, on its inner surface to engage the driven spindle.

#The cylinder 20, includes an axial slot, 40 of sufficient width for receiving the web material, 42.