JPH0533372U - Magnetic tape cassette - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To prevent the coil spring 12 from coming off the lock lever 15, to ensure the operation of the lever 15, and to facilitate the assembly of the air tape cassette. A lid 4 for opening and closing a front surface of the cassette shell 1 is pivotally attached to a side surface of the cassette shell 1, and one end 12b of a coil spring 12 is engaged with the lid 4 in a closing direction. A groove 18a is formed in the top portion 18 of the lock lever 15 for locking the lid 4 in the closed state.
The other end 12c of No. 2 is fitted in this groove 18a. As a result, the end 12c side of the winding spring 12 does not laterally deviate from the upper end 18 of the lock lever 15 and does not fall off, and the elastic force reliably works.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic tape cassette in which a pair of hubs containing magnetic tape are rotatably mounted in a box-shaped cassette shell, and in particular, a lid that opens and closes the front side of the cassette shell and a lid that rotates in the direction to close the lid. The present invention relates to an improvement of a magnetic tape cassette provided with a spring for moving and a lock lever for holding the closed state.

[0002]

[Prior Art]

 As this kind of magnetic tape cassette, for example, the one disclosed in Japanese Utility Model Publication No. 63-12466 is already known. As shown in the same publication, a box-shaped cassette shell is formed by stacking the upper half and the lower half on top of each other and joining them together. A pair of hubs, both ends of which are respectively wound, are rotatably supported, and the middle portion of this magnetic tape is guided to the front side of the cassette shell. The lid is rotatably attached to both sides of the cassette shell by pivot pins, and the rotation of the lid opens and closes the front surface of the cassette shell. Further, at least one side surface of the cassette shell is provided with a spring for rotating the lid in a closing direction and a lock lever for holding the closed state.

FIG. 8 is a diagram showing the side of one side surface of such a cassette shell 1 around the fulcrum of the lid 4. The lid 4 has a side plate 41, and a cylindrical shaft pin 5 is projectingly provided from an inner surface of the side plate 41. The shaft pin 5 is engaged with a bearing portion 24 formed on a side plate 20 inside the lower half 2 and is pressed by a side plate 32 inside the upper half 3 which is superposed on the bearing portion 24, so that the upper and lower half 3 It is rotatably supported on the two side surfaces. Needless to say, a similar side plate is also provided on the other side surface (not shown) of the lid 4, which is similarly rotatably attached to the upper and lower half side plates.

A spring receiving protrusion 13 and a lever engaging protrusion 14 are provided on the inner surface of the side plate 41 of the lid 4 in front of and behind the shaft pin 5, respectively. Further, shaft pins 16 projecting on both sides of the upper end of the lock lever 15 engage with bearings 22 formed on the side plates 20 and 21 on the inner and outer sides of the lower half 2, respectively. The lock lever 15 is rotatably supported by the side plates 32 and 31. The lock lever 15 is L-shaped and has a hook-shaped engaging portion 17 at its tip. The engaging portion 17 is adapted to engage with the lever engaging projection 14 of the lid 4, and the engagement locks the lid 4 in the closed state. The lock lever 15 has an operation piece 19 for rotating the lever 15 at its lower end.

The winding portion 12a of the winding spring 12 having an intermediate portion wound in a string shape is mounted so as to wind around the shaft pin 5 of the lid 4, and one end 12b side of the long extended ends is It is engaged with the spring receiving projection 13 of the lid 4, and the other end 12c side is engaged with the top portion 18 of the lock lever 15. When the winding spring 12 is mounted, an initial stress is applied in advance in a direction in which the winding portion 12a is wound, and its elastic force acts in a direction in which the lid 4 is closed via the spring receiving projection 13 and a lock lever It serves to rotate 15 in the direction in which its engaging portion 17 engages with the lever engaging projection 14.

The lock lever 15 is located between the side plates 20 and 21 on the inner side and the outer side of the lower half 2 so as to freely rotate about the shaft pin 16 as a fulcrum. There is some margin between them. On the other hand, the coil spring 12 is made of thin spring steel wire, and there is considerable play between the inner side and the outer side plates 20 and 21 of the lower half 2 and the end 12c side thereof is the top of the lock lever 15. It's just listed on page 18. Therefore, the end portion 12c of the winding spring 12 sometimes falls off from the top portion 18 of the lock lever 15, and the spring force of the spring is not exerted on the lock lever 15. This kind of trouble may occur when the magnetic tape cassette is assembled or actually used, especially when the lock lever 15 is manually rotated by placing a pin or the like on the operation piece 19 of the lock lever 15 and rotating the lock lever 15 manually. It tends to occur when unlocking.

Therefore, in the conventional technique disclosed in Japanese Utility Model Publication No. 63-12466, as shown in FIG. 8, the inside of the lower half 2 is on the rear side of the bearing portion 22 which pivotally mounts the lock lever 15. The upper surface of the partition wall formed so as to connect between the outer side plates 20 and 21 and the outer side plates 20 and 21 is formed low, and the groove portion 23 is provided between the inner surfaces 25 and 25 of the side plates 20 and 21. The end 12c of the groove is extended and inserted into the groove 23, and the upper side of the groove 23 is formed between the side plates 31 and 32 on the inner side and the outer side of the upper half 3 (not shown in FIG. 8). I'm trying to close it. This prevents the end 12c of the winding spring 12 from coming off when the magnetic tape cassette is assembled.

[Problems that the device is trying to solve]

However, as described above, since the coil spring 12 is thin, the end portion 12c of the coil spring 12 easily slips off from the top portion 18 of the lock lever 15, and the spring force of the spring is not exerted on the lock lever 15. In this case, since the fallen end 12c is received by the groove 23, the winding spring 12 is not completely disengaged, but each time the lid 4 is opened, the lock lever 15 is rotated in the same direction as the lid 4. There is a problem in that the end portion 12c of the coil spring 12 has to be reengaged with the top portion 18 of the lock lever 15 by moving the end portion 12c. In view of the problems in the conventional magnetic tape cassette, an object of the present invention is to provide a magnetic tape cassette in which the end of the winding spring does not drop from the lock lever, and thus the lid is securely locked. To do.

[0009]

[Means for Solving the Problems]

 That is, in order to achieve the above object, in the present invention, a cassette shell 1 which is formed by stacking and joining upper and lower halves 3 and 2 and housing the magnetic tapes 8 therein, and the cassette shell 1 are provided. A lid 4 that is rotatably pivoted on both sides and that opens and closes the front surface of the cassette shell 1, and a lid 4 that is rotatably pivoted on one side of the cassette shell 1 and is engaged with the lid 4 to engage the lid 4. Is mounted around the shaft pin 5 of the lid 4, and the ends 12b and 12c are engaged with the lid 4 and the lock lever 15, respectively. In a magnetic tape cassette having a winding spring 12 elastically biased in a closing direction and a direction in which the lock lever 15 engages with the lid 4, a groove 1 is formed in a top portion 18 of the lock lever 15. Forming a a, to provide a magnetic tape cassette, characterized in that fitting the end portion 12c of the coil spring 12 in the groove 18a.

[0010]

[Action]

 In the magnetic tape cassette according to the present invention, since the groove 18a is formed in the top portion 18 of the lock lever 15 and the end portion 12c of the coil spring 12 is fitted therein, the end portion 12c of the coil spring 12 is locked in the lock lever 15. It becomes difficult to shift laterally from the top 18 of 15. Therefore, the end 12c of the coil spring 12 does not fall off the top 18 of the lock lever 12.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. As an embodiment of the present invention, a state in which the upper half 3 of the magnetic tape cassette for video is removed is shown in FIG. 2, and a side view in which the upper half 3 is not removed is shown in FIG. As shown in FIG. 2, a pair of hubs 7, 7 around which both ends of the magnetic tape 8 are respectively wound are rotatably supported on both sides of the cassette shell 1, and the middle portion of the magnetic tape 8 is rotatably supported. The part is guided to the front side of the cassette shell 1. On the front surface side of the cassette shell 1, a lid 4 is rotatably pivoted by shaft pins 5 and 5 projecting inwardly from both side plates 41. The lid 4 is shown by a solid line and a two-dot chain line in FIG. The front surface of the cassette shell 1 is opened and closed by rotating as shown by. In addition, in FIG. 2, the hubs 7 and 7 have the flanges 6 and 6 having the concave and convex blades 9 and 9 on the peripheral surface, and the hubs 7 and 7 are arranged between the flanges 6 and 6 of the lower half 2. A stopper 10 is provided for engaging the blades 9, 9 to lock the hubs 7, 7. Further, as shown in FIG. 3, a lock lever 15 to be described later is incorporated at a position extending between the side plates 21 and 31 of the upper and lower halves 3 and 2 and the inside of the side plate 41 of the lid 4, and the operation piece 19 thereof is described above. It is exposed downward between the side plates 21 and 31 of the upper and lower halves 3 and 2 and the side plate 41 of the lid 4.

FIG. 1 is an exploded view showing one side surface side of the cassette shell 1 around a fulcrum of a lid 4, and FIGS. 4 to 6 are views showing a state in which this is assembled. As described above, the shaft pin 5 of the lid 4 is engaged with the bearing portion 24 formed on the side plate 20 on the inner side of the lower half 2 and the inner side of the upper half 3 superposed on the bearing portion 24. It is pressed by the side plate 32 and rotatably supported on the side surfaces of the upper and lower halves 3 and 2. A similar side plate is also provided on the other side surface (not shown) of the lid 4, which is similarly rotatably attached to the upper and lower half side plates.

A spring receiving protrusion 13 and a lever engaging protrusion 14 are provided on the inner surface of the side plate 41 of the lid 4 in front of and behind the shaft pin 5, respectively. Further, shaft pins 16 protruding to both sides on the upper end side of the lock lever 15 engage with bearing portions 22 formed on the side plates 20 and 21 on the inner side and the outer side of the lower half 2, respectively, and these are arranged on the inner and outer sides of the upper half 3. It is pressed by the side plates 32 and 31, and thereby the lock lever 15 is rotatably supported as shown by a solid line and a two-dot chain line in FIG. The lock lever 15 is L-shaped, has a hook-shaped engaging portion 17 at its tip, and has an operating piece 19 for rotating the lever 15 at its lower end. Further, a groove 18a for fitting an end portion 12c of a coil spring 12 described below is formed in the top portion 18 of the lock lever 15.

The winding portion 12a of the winding spring 12 in which the middle portion is wound in a string shape is mounted so as to wind around the shaft pin 5 of the lid 4, and one end portion 12b side is one of the long extending end sides. It is engaged with the spring receiving projection 13 of the lid 4, and the other end 12c side is fitted into the groove 18a of the top 18 of the lock lever 15. As shown in FIG. 6, the groove 18a of the top 18 of the lock lever 15 has a U-shaped cross section, and the width of the lock lever 15 on the upper surface of the top 18 is wider than the wire diameter of the end 12c of the coil spring 12. ing. Therefore, the end portion 12c of the winding spring 12 is completely held in the groove 18a and is held at the center of the top portion 18 of the lock lever 15 without being displaced laterally, that is, in the radial direction thereof. When the winding spring 12 is mounted, an initial stress is applied to the winding spring 12 in the winding direction of the winding portion 12a. Therefore, the lid 4 receives the elastic force of the winding spring 12 so as to be rotated from the position shown by the chain double-dashed line in FIG. 4 to the position shown by the solid line. At the same time, the lock lever 15 also receives the elastic force of the coil spring 12 so as to be rotated from the position shown by the chain double-dashed line in FIG. 4 to the position shown by the solid line.

As shown by the solid line in FIG. 4, when the lid 4 is closed by the elastic force of the coil spring 12, the hook-shaped engaging portion 17 at the tip of the lock lever 15 is also compressed by the elastic force of the same coil spring 12. The lid 4 is locked by engaging with the lever engaging protrusion 14 of the lid 4. From this state, for example, when a magnetic tape cassette is loaded in the cassette deck, as shown by the chain double-dashed line in FIG. 4, the lock release pin 26 provided in the cassette deck hits the operation piece 19 of the lock lever 15 and the winding spring The lock lever 15 is rotated around the shaft pin 16 in the leftward direction in FIG. As a result, the engaging portion 17 of the lock lever 15 is disengaged from the lever engaging protrusion 14 of the lid 4, and the lid 4 is unlocked, as shown by the chain double-dashed line. In this state, as shown by the chain double-dashed line in FIG. 4, the lid 4 can be rotated rightward around the shaft pin 5 against the elasticity of the coil spring 12 to open the lid 4.

As shown in FIGS. 4 and 6, the bearing portion 22 pivotally mounting the lock lever 15 is formed on the rear side thereof so as to connect between the inner side plates 20 and 21 of the lower half 2. The upper surface of the partition wall 27 is formed to be low, and the groove portion 23 is provided between the inner surfaces 25 and 25 of the side plates 20 and 21, and the end portion 12c of the coil spring 12 is elongated to form the groove portion. 23 has been inserted. Further, the upper side of the groove portion 23 is closed by a partition wall 28 formed between the inner and outer side plates 31 and 32 of the upper half 3.

FIG. 7 shows another example of the top portion 18 of the lock lever 15, (a) shows an example in which the groove 18a of the top portion 18 is a groove having a square cross section, and (b) shows An example is shown in which the groove 18a of the top portion 18 has a V-shaped cross section. In any case, the width of the surface portion of the top portion 18 is larger than the wire diameter of the winding spring 12, and the end portion 12c of the winding spring 12 is completely retained in the groove 18a.

[0018]

[Effect of the device]

 As described above, according to the present invention, since the end portion 12c of the winding spring 12 is securely held by the top portion 18 of the lock lever 15, the certainty of the operation of the locking lever 15 by the winding spring 12 is secured, and At the same time, the lid 4 can be locked, and at the same time, the end portion 12c of the winding spring 12 can be stabilized during the assembly of the magnetic tape cassette, thus providing the effect of providing a magnetic tape cassette that is easy to assemble.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of essential parts of a front side surface of a magnetic tape cassette according to an embodiment of the present invention.

FIG. 2 is a plan view showing a state in which an upper half of the magnetic tape of the embodiment is removed.

FIG. 3 is a side view of the magnetic tape cassette showing the same embodiment.

FIG. 4 is a partially cutaway enlarged side view of the front part of the magnetic tape cassette showing the embodiment.

5 is a cross-sectional view (a) taken along the line AA of FIG. 4 and an enlarged view (b) of a main part thereof.

6 is a cross-sectional view (a) taken along the line BB of FIG. 4 and an enlarged view (b) of its main part.

FIG. 7 is a perspective view of an essential part of a top sectional shape of a lock lever showing another embodiment of the present invention.

FIG. 8 is an exploded perspective view of a main part of a front side surface of a magnetic tape cassette showing a conventional example.

[Explanation of symbols]

 1 Cassette Shell 2 Lower Half 3 Upper Half 4 Lid 5 Lid Shaft Pin 8 Magnetic Tape 12 Winding Spring 12b Winding Spring End 12c Winding Spring End 15 Lock Lever 18 Lock Lever Top 18a Lock Lever Top Groove 20 Inner side wall of lower half 21 Outer side wall of lower half 31 Outer side wall of upper half 32 Inner side wall of upper half

Claims (1)

[Reference number] 0030356-01 [Claims for utility model registration] 1. A cassette shell (1) which is formed by stacking and joining upper and lower halves (3) and (2) and housing magnetic tapes (8) and (8) therein, and the cassette shell. It is rotatably pivoted on both sides of (1),
A lid (4) for opening and closing the front surface of the cassette shell (1)
And a lock lever (15) that is rotatably pivotally attached to one side surface of the cassette shell (1) and that engages with the lid (4) and holds the closed state of the lid (4).
And the end portions (12b) and (12c) are attached around the shaft pin (5) of the lid (4) and the lid (4).
And the lock lever (15) respectively, so that the spring (1) is elastically biased in a direction in which the lid (4) is closed and a direction in which the lock lever (15) is engaged with the lid (4).
2), a groove (18a) is formed in the top (18) of the lock lever (15), and the end (12c) of the coil spring (12) is formed in the groove (18a).
A magnetic tape cassette characterized by being fitted with.