JPS6325591Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape cassette having a locking mechanism for opening and closing the lid.

Generally, video tape cassettes are usually provided with a lid to cover the magnetic tape when not in use, due to the severe requirements, and a mechanism is provided to lock the lid when it is closed. Conventionally, tape cassettes in this field having a rotating opening/closing lid for protecting the tape include those shown in FIGS. 1 to 5. That is, the upper half 1 and the lower half 2 are combined facing each other to form a housing, and can be rotated in the direction of arrow A around rotational shafts provided on both sides of the opening/closing lid 3. It is configured. As shown in FIG. 2, a coil spring 4 is fitted to a rotation shaft 3a provided on one side of the opening/closing lid 3, and one end of this coil spring 4 is attached to a rotating shaft 3a provided on one side of the opening/closing lid 3. The other end is pressed against the protrusion 3b, and the other end supports the end face of the lid lock lever 5, which is rotatably supported in the thickness direction of the tape cassette body when the upper half 1 and the lower half 2 are assembled facing each other. By pressing, the opening/closing lid 3 is always urged to rotate in the closing direction. Also, the lid rod lever 5
is a locking protrusion 3 provided on the side of the opening/closing lid 3.
c and locks the opening/closing lid 3. Also, by pushing up the end face of the lid lock lever 5 in the direction of arrow B, the lid lock lever 5
The lock is released and the opening/closing lid 3 can be rotated in the direction of arrow A. When the lid 3 is opened by further rotation in the direction of arrow A, the coil spring 4 moves in the direction of arrow D and is pressed against the contact portion of the lid lock lever 5.

In the above configuration, as shown in FIGS. 3 and 4, the upper half 1, the lower half 2 and the lid lock lever 5 are
In order to prevent the generation of resin powder due to contact wear of the lid lock lever 5 and to improve ease of assembly, a slight clearance is provided when the lid lock lever 5 is moved in the direction of arrow E or arrow F. When the lid is moved in this direction, the coil spring 4 slips out of the abutting area of the lid and lock lever 5 into the gap between the side of the case and the lid and lock lever 5, causing malfunction of the opening/closing lid 3 and the lid and lock lever 5. occurs. In order to solve this problem, increasing the wall thickness of the lid lock lever 5 is conceivable, but this poses problems such as the need for component dimension control after molding and poor assembly performance.

The present invention eliminates the above-mentioned drawbacks, and examples thereof will be described below with reference to FIGS. 6 to 9.

6 and 7 show a first embodiment of the present invention, 6 is a lid lock lever,
A V-groove 6a is provided in the thickness direction of this end, and the upper half 1 and lower half 2 rotatably support the fulcrum shafts 6b, 6c of the lid lock lever 6. This V-groove 6a is deep enough to prevent the coil spring 4 from coming off when the coil spring 4 is brought into contact with the inside thereof, and makes it possible to position the coil spring 4 and prevent it from coming off. This V-groove 6a eliminates the work of removing the coil spring 4 after assembly and reassembling it twice.

8 and 9 show another embodiment of the present invention, in which a recess 7a with a width and depth slightly larger than the wire diameter of the coil spring 4 is formed at the end of the lid lock lever 7. This is a configuration in which the coil spring 4 is provided in the same direction as possible to position the coil spring 4 and prevent it from coming off. In addition, protrusions 8a and 8b are provided at opposing positions on the end of the lid lock lever 8, and the gap t formed by the protrusions 8a and 8b is made slightly larger than the wire diameter of the coil spring 4. Enables positioning and prevention of dislodgement.

As described above, the present invention solves the conventional malfunction by providing a spring groove in the coil spring contact part of the lid lock lever, which improves the reliability of the product. It has a big effect.

[Brief explanation of drawings]

Figure 1 is a perspective view of a conventional tape cassette; Figure 2 is a perspective view of a conventional tape cassette;
3 is a sectional view of the same essential parts, FIG. 4 is a perspective view of the conventional lid lock lever, FIG. 5 is a sectional view of the essential parts of the same lid lock after assembly, and FIG. 6 is a sectional view of the same essential parts. FIG. 7 is a sectional view of the main part of the lid lock after assembly; FIG. 8 is a perspective view of the lid lock in another embodiment of the invention; FIG. 9 is a perspective view of the lid lock lever in one embodiment of the invention; FIG. 7 is a perspective view of yet another embodiment. 1... Upper half, 2... Lower half, 3... Opening/closing lid, 4... Coil spring, 5... Lid lock lever, 6... Lid lock lever, 7... Lid lock lever, 8... …Ritudrotsu lever.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An upper half that constitutes an upper case, a lower half that pairs with this upper half to constitute a housing and is capable of storing a reel wound with tape, and a reel. It protects the tape pulled out from the reel, has a rotating shaft for opening and closing, a spring protrusion provided near the rotating shaft, and a protruding part for locking the opening and closing. The opening/closing lid to be protected, the lid lock lever which is rotatable about one point and is provided to lock or release the opening/closing lid by contacting the protrusion, and the lid lock lever and the spring-loading protrusion. A tape cassette comprising a spring that abuts and urges the opening/closing lid in a direction to close it, and the lid lock lever has a groove portion into which the spring can be fitted. (2) The tape cassette according to claim 1, wherein the groove portion is V-shaped.