Abstract: A magnetic tape cassette has a tape pad for pushing the magnetic tape in the path of the magnetic tape. The tape pad comprises one piece of a tape contacting part and a spring member for supporting the tape contacting part which is made of a carbon-containing polymer having elasticity.

Abstract: A fitting piece is adapted to fit in a recess for receiving an actuation pin of a recorder. The fitting piece comprises a middle portion; a pair of legs vertically extending the ends of the middle portion; and a cooperative lug formed on the leg. The fitting piece can be fitted into the recess in two different positions either permitting recording or preventing cancellation of the recorded sound.

Abstract: A case for holding a magnetic tape cassette comprises a case body and a cover pivotally joined together by a pair of pivots fitted in corresponding pivot-receiving holes, with arcuate protuberances formed respectively around the pivots and pivot holes in such a manner that, when the pivots have been fitted in the holes, the both protuberances coact to keep the opposing side walls of the case body and the cover apart from each other, the protuberances themselves being arranged so as not to overlap each other. The pivots protrude inwardly from the side walls of the case body, the pivot holes are formed in the side walls of the cover, and the arcuate protuberances are formed, one for each, on the inner faces of the side walls of the case body and on the outer faces of the side walls of the cover. The protuberances of the case body are formed to extend semicircularly through an angle of 180 degrees around the pivots, and the protuberances of the cover extend through an angle of 90 degrees around the pivot holes.

Abstract: A tapping boss formed in one piece with the upper half casing for joining the lower half casing of a magnetic tape cassette comprises a stem having a cross sectional area slightly larger than the diameter of a tapping screw to receive the screw and a plurality of ribs which project radially from the cylindrical surface of said stem and whose top portions provide contact shoulders for the boss supporter of a lower half casing.

Abstract: A tape pad for a tape cassette for continuously contacting a magnetic tape under pressure in a casing wherein the tape pad has a fitting hollow in which a supporting member non-rotatably mounted on the casing is inserted to support the tape pad.

Abstract: The tape cassette comprises a guide rib extending upward from a lower casing to form a supporting surface for the entire width of the magnetic tape and a guide rib extending downward from an upper casing along the rear surface of the guide rib of the lower casing to provide a support for the guide rib of the lower casing.

Abstract: A reel for a tape cassette comprises reinforcing ribs connected, in the radial direction, with an inner peripheral surface of a magnetic tape winding core which is coaxially placed to the rotary axis. The magnetic tape winding core is formed by an inner tubular wall which is connected with the reinforcing ribs and an outer cylindrical or tubular wall which is coaxially connected with the inner tubular wall with a gap.

Abstract: A magnetic tape cassette in which a cassette housing has half cases with aligned, confronting projections on innder surfaces thereof on which a cylindrical guide roll with an axial bore therethrough is supported, has an annular, axially projecting rib on either the guide rolls or the projections so as to prevent any burrs which may be on the guide roll around the axial bore therethrough from coming into contact with the projections, thereby preventing noise which might otherwise be caused by the burrs.

Abstract: A tape cassette comprises an upper half casing and a lower half casing and male hollow cylindrical projections having a notch mounted on either of the upper half casing or the lower half casing and female hollow recesses mounted on the other half casing at the corresponding positions. The upper and lower half casings are superposed to fit the male hollow cylindrical projects into the corresponding female hollow recesses and are fixed together by screwing self-tap bolts from the female hollow recesses into the male hollow cylindrical projections having notches to fix the projections on the inner surfaces of the female hollow recesses.

Abstract: A tape cassette including an upper half-case and a lower half-case and a tape guide wherein the tape guide is held only on one half-case and the upper and lower half-cases are fixed by screws only from one side of the half-cases through communicating holes except for a hole for the tape guide and wherein one end of a plate spring mounted on the one half-case and the other end or middle part of the plate spring is press-contacted with a lock plate to form a cover locking mechanism.

Abstract: A tape cassette braking mechanism which includes a resilient plate having a flat part and two bent parts wherein the flat part is contacted with a side wall of a half-case of the tape cassette and the two bent parts are respectively contacted with corresponding brakes such that the tape is effectively held without loosing the same in the tape cassette.

Abstract: A tape cassette comprises a locking mechanism for locking a cover for protecting a tape. The locking mechanism comprises a plate spring whose one end is fixed to a rib mounted on a half case and whose other end is pressed to a lock plate.

Abstract: A tape cassette reel comprises a special clamp which is fitted to a groove of a hub. The clamp comprises an upper rib, a pair of legs extended from the upper rib; a lower rib inserted between the legs and a projected part formed on the lower rib. The projected part is fitted to a cavity formed at the bottom of the groove of the hub. A tape is completely clamped on the hub by the clamp without failure.

Abstract: A tape cassette comprises a cover for covering a wound tape which comprises a polar member mounted on a wall of the cover and a coil spring fitted to the polar member. The polar member has a narrow width slit at the free end and a wide width slit adjacent to the narrow width slit at the side of the fixed end and one end of the coil spring is inserted in to the wide width slit through the narrow width slit and the other end of the coil spring is contacted with a case body.

Abstract: A tape cassette including a cylindrical tape guide having a slit in the axial direction and a groove at the end thereof which is fitted to a projection of a pole connected to a half of the case. The cylindrical tape guide can also be provided with a first and second notch formed therein as a substitute for the groove. Moreover, a groove can be formed at each end of the cylindrical tape guide.

Abstract: A video cassette tape reel comprises at least one flange; a ring hub having a groove in parallel to the axis of the hub; a clamp fitted to the groove; and peripheral guides formed in the hub between which the clamp is fitted, whereby a tape clamped on the ring hub is not contacted with the flange in winding the tape.

Abstract: A magnetic tape cassette in which a unitary pressure pad assembly is retained within a recess formed in a portion of a cassette which allows for free movement of the assembly toward and away from the record medium and transverse thereto thereby to allow pivotal movement of the assembly about an axis parallel to the longitudinal direction of movement of the record medium to minimize variations in recording and playback performance between opposite sides of the tape.

Abstract: A tape cassette characterized by a bias changeover slot being disposed adjacent to an accidental erasure protective slot and wherein a blocking element for covering an opening of the accidental erasure protective slot is securable on the wall thereof which is disposed opposite the bias changeover slot.

Abstract: A tape cassette characterized by a bias changeover slot located adjacent to an accidental erasure preventive slot wherein, when the accidental erasure preventive slot is kept in an inoperative state, a U-shaped snap is secured in such slot so that the base of the U-shaped snap is disposed to cover the opening of the accidental erasure preventive slot, and when the slot is to be kept in an operative state, the U-shaped snap is secured in the slot so that the base of the U-shaped snap is arranged against the wall of the slot located opposite the adjacent bias changeover slot, whereby the accidental erasure preventive slot is uncovered and the snap is secured within the cassette.

Abstract: An endless tape cartridge has upper and lower casings, and a reel contained in a room formed in the casings and consisting of a winding core and a disc, wherein an endless tape is led from the central portion of the reel to the peripheral portion thereof through the outside of the reel. The inner surface of the disc which is brought into contact with one side of the endless tape is separated into internal and external areas in a radial direction. The internal area has a layer with a friction factor smaller than that of the external area.