JPS6331234Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a cassette half popping-out prevention device, and more specifically, to a popping-out prevention device suitable for a vehicle-mounted cassette tape player.

Some car-mounted cassette tape players and some home tape players are equipped with an ejector to facilitate the removal of the cassette half. When ejecting a cassette half using this ejecting device, the cassette half will be ejected quite far unless some kind of restraint is applied.Especially in the case of a car-mounted cassette tape player, the ejected cassette half may fall at the driver's feet, causing trouble during operation. There were problems such as it getting in the way and having to search for the fallen cassette half when trying to play it.

Therefore, in the past, a system has been used in which spring pressure is applied to the cassette door of the player to suppress the hub protrusion of the cassette half. With this type of ejection prevention device, the cassette door is always pressed against the cassette half while it is being loaded, so the cassette half may be damaged, and the spring load of the cassette door and the spring load for returning the cassette tape during ejection may be slightly affected. It is difficult to set the load because of mutual influence.

As shown in FIG. 1 and FIG. 2, a conventional cassette half protrusion prevention device is schematically illustrated in which a trapezoidal hub projection 2 formed on both sides of a cassette half 1 is connected to a half housing portion. The cassette door 3, which is biased by a restraining spring provided at the cassette door 3, is in a restrained state from one side. In such a device, there are many problems in setting the spring pressure as described above.

Therefore, this invention attempts to solve the functional and design problems of the conventional cassette half pop-out prevention device, and for this purpose, a restraining spring biased by a spring is brought into contact with the hub protrusion of the cassette half. It is characterized by having a configuration.

Hereinafter, embodiments of this invention will be described with reference to the accompanying drawings from FIG. 3 onwards. First, in FIG. 3, reference numeral 11 denotes a half holder attached to the cassette half accommodating section, and a restraining spring 12 is attached so that it can come into contact with both inclined surfaces of the hub protrusion H of the cassette half K.
is attached to the half holder 11 by caulking its base end with a shaft 13. The tip end 12a of this restraining spring 12 is in contact with the inclined side surfaces H ₁ and H ₂ of the hub projection H.

Next, the operation of the cassette half protrusion prevention device according to this invention will be explained. First, in FIG. 5, when the cassette half K is pressed in an ejecting operation, a component force B of the extrusion force A is generated from the center O of the shaft 13 to the point P of contact with the inclined side surface _H1 of the tip 12a.
acts, and the restraining spring 12 acts with a pressing force C centered on O, and a reaction force D acts on the inclined side surface _H1 in the opposite direction to the component force B.

Furthermore, in _FIG .
If it acts on point P', then at point P', point P
A pressing force C' larger than the pressing force D is applied to the inclined side surface _H1 , and a pressing force D' larger than D is applied to the inclined side surface H1, and the direction is opposite to the component force B' of the half return force.

Here, when B'=D', the return force of the cassette half is canceled out by the force of the restraining spring, and the cassette half stops at that position. In addition, if the cassette half is stopped in a state where it protrudes further from the set position due to the inertia force, the component force on the inclined side surface acts in the opposite direction to the direction of the cassette half return force of the pressing forces A and A', and the half holder The cassette half is pushed back to a position where it balances the frictional force at the contact surface between the cassette half and the cassette half, and then stops.

Furthermore, in FIGS. 7 and 8, a boss portion is provided at the base end 12b of the restraining spring 12, and this boss portion is pivoted by a shaft 13, and the fulcrum of the restraining spring 12 is at two points of O ₁ and O ₂ . Therefore, the points of contact with the inclined side surface can be assumed to be P ₁ and P ₂ . This contact point _P1 corresponds to the tip 12a of the restraining spring 12, and the small protrusion 12c provided slightly closer to the proximal end than this tip corresponds to the contact point _P2 . 2
Can act in stages.

As is clear from the above explanation, according to the cassette half protrusion prevention device of this invention, the restraining spring is in contact with the inclined side surface of the hub protrusion of the cassette half, so that the spring load of the cassette door can be extremely reduced. The cassette half can be made smaller and the load on the cassette half caused by the door can be reduced.This makes the return of the cassette half stable when ejecting, prevents scratches on the contact surface between the cassette door and the cassette half, and reduces the burden on the cassette half when ejecting. The return position can be set arbitrarily.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional cassette half ejection prevention device, Fig. 2 is a side view of the same, Fig. 3 is a plan view of the protrusion prevention device according to this invention, and Fig. 4 is taken along the line shown in Fig. 3. An enlarged sectional view, FIGS. 5 and 6 are explanatory diagrams illustrating a state in which the cassette half is prevented from popping out, and FIGS. 7 and 8 are illustrations of other embodiments to prevent the cassette half from popping out. FIG. 11...half holder, 12...pressing spring, 1
3... Axis, H ₁ , H ₂ ... Inclined side surface.

Claims (1)

[Utility Model Claims] A cassette half ejection prevention device comprising: a half holder 11 attached to a cassette half storage section, against which a cassette half K is pressed by an ejection action; and a pressure spring 12 attached to said half holder 11, said pressure spring 12 contacting both side surfaces of a hub protrusion H provided on said cassette half K when said cassette half K is ejected, thereby preventing said cassette half K from ejecting too far.