JPS5935903Y2 - magnetic tape cartridge - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a magnetic tape cartridge that uses a plate spring as a spring member that applies a spring force to a lock plate that engages and disengages from a front cover.

Conventionally, the front cover, which is pivotally supported on the front side of a magnetic tape cartridge consisting of an upper case and a lower case, as in the bidi saairiki set, is attached to the pink plate 20 as shown in Fig. 6. The protrusion 21 is locked by being locked in a recess 24 formed on the inner surface of the front cover 23 by the spring force of the spring 22, and the front cover 2
3. Maintain the closed state.

Further, when a magnetic tape cartridge is inserted into a video deck, the pressing protrusion 25 provided on the lock plate 20 is pressed in the direction of arrow B, and the lock plate 20 is pressed against the spring force of the spring 22. is rotated as shown in Fig. 7 to release the above-mentioned locked state and open the front cover.

By the way, the spring 22 includes a base portion 22a made of a linear spring material curved into a coil shape, and spring-loaded portions 22b and 22 extending linearly from both ends of the base portion 22a.
c, the base 22a is fitted to the support shaft 20a of the lock plate 20, and one spring-loaded piece 22b is attached to the locking piece 20b of the lock plate 20, and the other spring-loaded piece 22c is attached to the locking piece 20b of the lock plate 20. Since it is assembled so as to be in contact with the vertical wall 28 of the lock plate storage section 27 provided in the lower case 26, the assembly work is troublesome and it is not suitable for automation, so there is a drawback that the workability is poor.

The object of this invention is to provide a magnetic tape cartridge using a spring that can solve the above-mentioned drawbacks, simplify assembly, enable automation, and improve workability.

Embodiments of this invention will be described below with reference to the drawings.

In FIG. 1, a magnetic tape cartridge 1 is formed by combining an upper case 2 and a lower case 3, and a front cover 4 is rotatably supported on the upper case 2. The front surfaces of the case 2 and the lower case 3 are closed.

The lower case 3 has a tape reel 5 as shown in FIG.
, 6 are rotatably housed.

Reference numeral 7 denotes a lock plate storage section, and this lock plate storage section 7 is provided on one side of the front surface of the lower case 3, and is connected to an upper surface opening 8.
is formed.

9 is a lock plate, which is rotatably suspended from the front standing wall 10 and the rear standing wall 11 of the lock plate storage section 7;
A locking protrusion 12 and a pressing protrusion 13 are provided protrudingly on the - side,
These surface protrusions 12, 13+t penetrate the side wall 14 of the lock plate storage portion 7 so as to be freely protrusive and retractable.

Further, a regulating rib 9a is provided on the other side.

Reference numeral 15 has a U-shaped bent plate and is inserted between the other side surface 9a of the lock plate 9 and a vertical wall 16 provided opposite to the side wall 14, and is attached to the lock plate 9. On the other hand, a spring force is applied toward the locking protrusion 12 side.

The plate-shaped spring 15 is formed of a metal thin plate made of bronze or stainless steel, for example, and has a rectangular shape as shown in FIG. This forms relief pieces 1sb and 15b.

Therefore, by positioning the plate spring 15 above the upper surface opening 8 of the lock plate housing 7 as shown in FIG. 4 and pushing down the recess 15a in the direction of arrow A, , both side surfaces are in contact with the other side surface 9b of the lock plate 9 and the standing wall 16, and the front side is in contact with the front standing wall 1.
A recess formed on the inner surface of the front cover 4 is inserted in a state in which the rear side is regulated by the regulating rib 9a and the regulating rib 16b formed on the vertical wall 16, and the locking protrusion 12 is formed on the inner surface of the front cover 4 by spring force. 17 to lock the front cover 4.0 When the magnetic tape cartridge 1 is inserted into the video deck, the pressing protrusion 13 is pressed as in the conventional case, and the lock plate 9 is pressed against the spring of the plate spring 15. Arrow C against force
direction to release the above lock and close the front cover 4.
will be released.

As explained above, the plate spring 15 can be easily assembled by pressing down from above the upper surface opening 8 of the lock plate housing 7, so that assembly can be automated and workability can be greatly improved.

Furthermore, since the plate-shaped spring 15 has a recess 15a in its center, a pressing member (not shown) of the automatic assembly device can be fitted into this recess 15a to prevent misalignment during assembly. can do.

Furthermore, since relief pieces 15b are formed at both ends, the corners of both ends of the plate spring 15 do not come into contact with the other side surface 9a of the lock plate 9 and the vertical wall 16, so there is no catching and smooth operation is possible. There are advantages such as becoming

Further, even after inserting the plate spring 15 into the lock plate storage part 7, the plate spring 15 is inserted into the front side of the restriction rib 9a of the lock plate and the restriction rib 16a formed on the vertical wall 16 of the lock plate storage part 7. As a result, the plate spring can always be maintained at a predetermined position even if it is pinched from the outside, thereby preventing the problem of deterioration of the locking mechanism due to displacement of the plate spring in the lock plate housing.

[Brief explanation of the drawing]

Figure 1 is an overall perspective view of a magnetic tape cartridge to which this invention is applied, Figure 2 is a partial plan view of the lower case, and Figure 3 is a partial perspective view of a magnetic tape cartridge to which this invention is applied.
The figure is an enlarged perspective view of the plate spring according to this invention, Figure 4 is an explanatory diagram when the plate spring is assembled, Figure 5 is a longitudinal sectional front view showing the plate spring installed, Figure 6 and FIG. 7 is an explanatory sectional view of a conventional example. 1...Magnetic tape cartridge, 2...
・Upper case, 3...Lower case, 4...
Front cover, 7...Lock plate storage section, 8
...Top opening, 9...Lock plate, 9b...Other side, 9a...
Regulating rib, 12... Locking protrusion, 15...
・Plate spring, 16... Standing wall, 16a...
・Regulation rib.

Claims (1)

[Scope of utility model registration request] A locking protrusion 12 is provided on one side of the upper case 2 to engage with and disengage from the front cover 4 which is pivotally supported on the front surface of the upper case 2 so as to be openable and closable. A regulating rib 9a formed near the front of the other side surface 9b of the lock plate 9, which is rotatably suspended in the lock plate accommodating section 7 formed with a A regulating rib 16a formed on the vertical wall 16 of
A magnetic tape cartridge characterized in that a plate spring 15 is inserted from the upper surface opening 8 into the front side of the cartridge to apply a spring force toward the locking protrusion 12 side.