Superposed tape cassette storage racks with pusher unit facilitating tape withdrawal

Claim 1

The combination of a tape cassette storage rack and a tape cassette stored therein, said tape cassette having opposite sides, a rear end, a front end, and a bottom extending between said ends and said sides, and defining first grooves in said opposite sides and a second groove in said bottom thereof, said tape being accommodated in said tape cassette storage rack in a predetermined inserted position in which a clearance is established between the rear end of said tape cassette and said tape cassette storage rack, and said tape cassette storage rack having a main body including opposite side walls, a bottom plate extending between said side walls and having a protrusion extending therefrom into said second groove so as to engage said tape cassette, and an open portion at which the front end of said tape cassette is exposed and through which said tape cassette is insertable into and withdrawable from the tape cassette storage rack, retractable engaging means mounted on at least one of the side walls of said main body and engaging a respective one of said first grooves with said tape cassette in said inserted position for releasably retaining said tape cassette in said inserted position within said tape cassette storage rack, and pushing means mounted to said main body and contacting said tape cassette for exerting a biasing force on said tape cassette that acts in direction toward the open portion of said main body and which biasing force is insufficient to move said tape cassette from said inserted position and out of engagement with said engaging means, said tape cassette being slidable, with the bottom thereof being guided by said projection and at least one of the sides thereof being guided by said at least one of the side walls of said main body, further into said tape cassette storage rack from said inserted position against, the biasing force exerted by said pushing means, whereby when a plurality of said tape cassette storage racks having respective said tape cassettes accommodated therein in said inserted positions are superposed and a desired one of the tape cassettes is withdrawn from its respective said tape cassette storage rack through the open portion of the main body thereof, any said tape cassette adjacent to said desired one can be slid further into the respective said tape cassette storage rack in which it is accommodated thereby allowing said desired one of the tape cassettes to be readily grasped and withdrawn whereupon said any said tape cassette will be restored to its inserted position under the biasing force exerted by the pushing means of the tape cassette storage rack in which it is accommodated.