Display units

A pilfer resistant display unit for displaying cassettes while permitting inspection of the faces thereof, comprising a base including a vertically extending support rod, a pillar member having a vertically directed central aperture rotatably mounted on said support rod, a plurality of angularly spaced apart sets of support arms extending radially from said pillar, each of said sets of support arms comprising an upper arm and a lower arm, said arms being vertically spaced apart in accordance with the vertical extent of said cassettes, the upper arm of each set including radially extending depending parallel flanges, and the lower arm of each set including upwardly extending parallel flanges, the upper and lower flanges of each set being disposed in coplanar alignment to define a channel having an outwardly open mouth through which said cassettes may be slidably received and removed in a radial direction, said flanges prohibiting substantial non-radial movements of a cassette mounted within a said channel, a locking frame mounted on said pillar for rotation relative thereto about a vertical axis, a plurality of vertically directed blocking arms formed on said frame, said blocking arms being shiftable between blocking and unblocking positions of said mouth portions of said channels selectively in accordance with the rotated position of said locking frame relative to said pillar member, and locking means extending between said pillar member and said locking frame for locking said blocking arms of said frame in said blocking position and releasing said arms to permit relative rotation of said locking frame and pillar respectively in the locked and unlocked positions of said locking means.