JPH0356925Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention is a tape cartridge that has a front lid on the front of the main body case, and uses the reaction force of a spring member to bias the front lid to rotate when closed. Measures have been taken to prevent the lid side wall from deforming.

[Conventional technology]

FIG. 6 shows a tape cartridge for video use, which is a typical example of the tape cartridge to which the present invention is directed. In such a tape cartridge, conventionally, as shown in FIGS. 7 and 8, pivot holes 9 are provided in the left and right side walls 8 of the main body case 1, which is formed by butting and joining the upper and lower plastic cases 1a and 1b. A pivot shaft 3 is provided protruding from each inner surface of the left and right side walls 2a of the front cover 2 made of plastic, which opens and closes the front surface of the main body case 1, and the pivot shaft 3 can be freely rotated into the pivot hole 9. It is inlaid and pivotally supported. A pivot shaft 2 facing inward from at least one of the left and right side walls 8 of the main body case 1
The front cover 2 is always biased to rotate in the closing direction by a spring member 4 hung over the tip of the tape 5 and the inner surface of the main body case 1, and the front cover 2 covers and protects the front outside of the tape 5. When this tape cartridge is loaded onto a deck, the front lid 2 rotates upward against the spring member 4 as shown by the imaginary line in FIG.
The tape 5 is drawn out forward from the front of the case.

This type of spring member 4 is composed of a torsion coil spring, and includes a coil portion 4a, a hook portion 4b provided at one end of the coil portion 4a, and an arm bent at a right angle to the hook 4b at the other end of the coil portion 4a. It has a portion 4c. As shown in FIGS. 7 and 8, the spring member 4 has a coil portion 4a loosely fitted near the tip of the pivot shaft 3 facing inward from the side wall 8 of the main body case 1, and a hook portion 4b. The coil part 4a on the pivot shaft 3 is hooked onto a spring hanging rib 6 protruding toward the outside of the case, and the arm part 4c at the other end is inserted into the spring hanging groove 7 provided on the inner surface of the main case 1 to attach it. are doing.

[Problem that the invention attempts to solve]

However, in this structure, when the front cover 2 is rotated to open upward, the spring member 4 is rotated around the axis of the coil portion 4a as shown in FIGS. 8 and 9 (view from arrow B in FIG. 8). When a torsional moment is applied to the coil part 4a, the coil part 4a contracts and tilts in the C ₁ and C ₂ directions by the gap between it and the pivot shaft 3. In this way, the arm part 4c acts as a spring, so that the arm part 4c is held in the spring groove 7. It is pulled toward the inside direction D of the case and exerts a tensioning action, and this reaction force is transmitted from the hook portion 4b to the spring hanging rib 6.
As a result, the pivot shaft 3 is pushed out toward the outer side of the case E, resulting in a drawback that the side wall 2a of the front lid 2 is warped and deformed toward the outer side of the case as shown in FIG. Naturally, the amount of deformation G of the front lid side wall 2a increases as the spring force increases.

As the front cover 2 is rotated upwardly, the side wall 2a deforms to protrude outside the main case 1, and when the amount of protrusion H is large, the side wall 2a deforms when the front cover 2 is opened and rotated. There is a risk that the tape cartridge may come into contact with a member on the deck side and interfere with it, making it impossible to remove the tape cartridge.
During continued use, the front lid side wall 2a tends to be constantly deformed and protruding outside the case. Particularly, when the front cover 2 is placed under high temperature with the top open (for example, when placed in a video deck for a long time), this deformation becomes plastic deformation and tends to remain even after the front cover 2 is closed. It was hot. Furthermore, the front lid side wall 2
Due to the deformation of the front cover 2, the opening and closing rotation of the front cover 2 may not be performed smoothly, and the side wall 2a and the main body case 1 may
When there is a locking member (not shown) installed between the front cover and the front cover (a member that prevents the front cover from rotating when not in use), there is a problem that this also has an adverse effect and the locking function is impaired.

The purpose of this invention is to effectively and reliably prevent the side wall 2a of the front cover 2 from protruding outward from the case by improving the shape of the pivot shaft 3 mentioned above. do.

[Means for solving problems]

In order to achieve the above object, in the present invention, as illustrated in FIG. A pivot shaft 3 is provided in a protruding manner, and a pivot hole 9 into which the pivot shaft 3 is rotatably fitted and supported is provided in the side wall 8 of the main body case 1 which is closely opposed to the inside of the lid side wall 2a. Pivot hole 9 of support shaft 3
The present invention assumes that a tape cartridge is provided with a spring member 4 that constantly biases the front cover 2 in the closing direction between the end closer to the tip facing inward of the case and the inner surface of the main case 1. do. In addition, a collar 10 having a larger diameter than the pivot hole 9 is provided on the circumferential surface of the pivot shaft 3 between the side wall 8 and the spring member 4.

[Effect]

In such a case, when the pivot shaft 3 receives a force that pushes the case outward due to the reaction force of the spring member 4, the collar 10 comes into contact with the inner surface of the side wall 8 of the main case 1, so that the case of the pivot shaft 3 This will prevent outward movement.

[Effect of idea]

According to the present invention as described above, even when the front cover 2 is opened and rotated, the spring member 4 is applied to the side wall 2a of the front cover 2.
will no longer protrude and deform toward the outside of the case.
Therefore, it does not interfere with the operation of attaching and detaching the front cover to the deck, ensures smooth opening and closing rotation of the front cover 2, and does not adversely affect the means for locking the front cover 2 in the closed position. disappears.

[Embodiment 1] FIGS. 1 and 2 show a first embodiment of the present invention, and the spring member 4 in this case has a coil portion 4a and a hook portion 4 at one end of the coil portion 4a, as in the conventional case.
b, and an arm portion 4c at the other end, and has a coil portion 4a.
is loosely fitted onto the pivot shaft 3, the hook portion 4b is hooked onto the spring hooking rib 6 on the pivot shaft 3, and the arm portion 4 is
c is inserted into a spring hook groove 7 recessed in the inner surface of the main body case 1 side. A circular collar 10 having a diameter larger than the diameter of the pivot hole 9 is integrally formed over the circumferential surface of the pivot shaft 3 between the side wall 8 of the main body case 1 and the spring member 4. Incidentally, when fitting the pivot shaft 3 having the flange 10 into the pivot hole 9, as shown in FIG. The pivot hole 9 is formed by matching the notch 9b provided in the side wall 8 of the upper case 1b, and the pivot shaft 3 is inserted into the notch 9a on the upper case 1a side before the upper and lower cases 1a and 1b are brought together. However, after this, an assembly method may be adopted in which the upper and lower cases 1a and 1b are butted and joined.

In such a case, when the front cover 2 is rotated to open upward, the spring member 4 receives a torsional moment around the axis of the coil portion 4a, and the coil portion 4a contracts by the gap with the pivot shaft 3, causing an inclination. The arm portion 4c is brought closer to the inside direction D of the case in the spring hook 7, and the pivot shaft 3 receives a force that pushes the pivot shaft 3 toward the outside of the case due to the reaction force of the spring member 4. It comes into contact with the inner surface of the rigid side wall 8 and sufficiently resists the extrusion force.

[Embodiment 2] Fig. 3 shows a second embodiment of the present invention, in which a tapered surface 11 is provided at the open end of the pivot hole 9 in the side wall 8 of the main body case 1 on the inside of the case, and the pivot Axis 3
A tapered surface 12 is also provided on the outer end surface of the case of the collar 10, and the tapered surfaces 12, 1 of the collar 10 and the side wall 8 are
An attempt was made to achieve a similar effect by having the two parts touch each other.

[Embodiment 3] Fig. 4 shows a third embodiment of the present invention, in which the frictional contact area of the collar 10 with the side wall 8 due to the rotation of the pivot shaft 3 is reduced to reduce the rotation. In order to level it out smoothly, a tapered surface 13 is provided only on the collar 10 side.

[Embodiment 4] FIG. 5 shows a fourth embodiment of the present invention, in which the flange 10 is provided in a segmented manner in the circumferential direction on the circumferential surface of the pivot shaft 3. Also in this example, the frictional contact between the collar 10 and the side wall 8 due to the rotation of the pivot shaft 3 can be minimized as much as possible.

The entire details of the illustrated embodiment are as described above.
The present invention is not limited to this. For example, the spring member 4
The collar 10 may be provided not only on one side of the left and right pivot shafts 3, 3 of the front lid 2, but also on both of them. Also,
The collar 10 may be constructed separately from the pivot shaft 3, and may be inserted into the pivot shaft 3 from the tip thereof in the axial direction and fixed therein. Furthermore, it goes without saying that the present invention is not limited to the tape cartridge of the form shown in FIG. 6, but can be widely applied to various tape cartridges having a front cover 2 on the front surface of the main body case 1.

[Brief explanation of the drawing]

1 and 2 show a first embodiment of the present invention, with FIG. 1 being a plan view of the main part as seen from the bottom side, and FIG. 2 being a longitudinal sectional side view of the main part. FIG. 3 is a plan view of the main parts of the second embodiment of the present invention, viewed from the bottom side. FIG. 4 is a plan view of the main parts of the third embodiment of the present invention, viewed from the bottom side. FIG. 5 is a sectional view of a pivot shaft showing a fourth embodiment of the present invention. FIG. 6 is a perspective view illustrating a tape cartridge to which the present invention is directed. Figures 7 to 1
Fig. 0 shows a conventional example, Fig. 7 is a sectional view taken along the line A-A in Fig. 6, Fig. 8 is a plan view of the main part seen from the bottom side, and Fig. 9 is a cross-sectional view taken along the arrow B in Fig. 8. visual view,
FIG. 10 is a plan view illustrating an abnormally deformed state of the side wall of the front lid. DESCRIPTION OF SYMBOLS 1... Main body case, 2... Front lid, 2a... Lid side wall, 3... Pivot shaft, 4... Spring member, 4a... Coil part of spring member, 4b... Hook part of spring member, 4c ...Arm portion of spring member, 6...Spring hanging rib, 7...Spring hanging groove, 8... Side wall of main body case, 9... Pivot hole.

Claims (1)

[Scope of utility model registration request] A front lid 2 that closes the front surface of the main body case 1 has a pivot shaft 3 that serves as an opening/closing fulcrum protruding from the inner surface of at least one of the left and right lid side walls 2a.
A pivot hole 9 into which the pivot shaft 3 is rotatably fitted and supported is provided in the side wall 8 of the main body case 1 facing the inside of the main body case 1, and the tip of the pivot shaft 3 facing inward of the case from the pivot hole 9 is provided. The side wall 8 on the pivot shaft 3 is attached to the tape cartridge in which a spring member 4 is hung between the end on the near side and the inner surface of the main body case 1 to always bias the front cover 2 in the closing direction. A tape cartridge characterized in that a collar 10 having a larger diameter than the pivot hole 9 is provided on the circumferential surface of the shaft between the spring member 4 and the shaft member 4.