JPH054154Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a cassette lid opening/closing device for a tape recorder.

(b) Prior Art Conventionally, for example, in a portable headphone stereo type tape recorder, the cassette lid opening/closing device has been constructed as shown in FIGS. 5 and 6. The formed cassette mounting recess 3 is rotatably pivoted toward the cabinet 2 to open and close the cassette mounting recess 1.
The torsion spring 5 has one end 5a inserted into the insertion hole 6 on the side of the cabinet 2 and the other end 5b inserted into the insertion hole 7 of the leg piece 3a of the cassette lid 3. If the other end 5b side is below the line segment with the line segment connecting the rotating shaft 4 of the cassette lid 3 as the border, a force in the closing direction is continued to be applied to the cassette lid 3,
If the other end 5b side is above the line segment, a force in the opening direction will continue to be applied to the cassette lid 3. That is, when the other end 5b of the torsion spring 5 is below the line segment as shown in FIG. The other end 5b of the torsion spring 5 acts in the closing direction of the cassette lid 3.
If it is above the line segment, the component force F'y will act in the direction of opening the cassette lid 3. Note that P ₁ indicates the closed position of the cassette lid 3, P ₂ indicates the open position of the cassette lid 3, and P ₃ indicates the position where the direction of the component force Fy directly involved in opening and closing the cassette lid 3 changes. ing. Therefore, in the cassette lid opening/closing device having such a structure, the cassette lid 3 can be rotated between the closed position and the open position using a single torsion spring 5 as shown in FIG. (See Publication No. 102E2).

(c) Problems to be solved by the invention However, in the case of the conventional cassette lid opening/closing device, if the opening angle of the cassette lid is small,
That is, when the angle θ shown in FIG. 6 is small, the amount of rotational displacement of the torsion spring is also small, and both the component forces Fy and F'y involved in the opening and closing action of the cassette lid become small, and the cassette lid is moved to the closed position and the open position. A problem has arisen in which the cassette lid opens and closes easily because the force to maintain it in position is weakened. In particular, when such a cassette lid is provided with a holder portion in which the cassette is housed, a stronger force is required to maintain the cassette lid in the closed position. Therefore, it is possible to make the force of the torsion spring stronger, but if the force is made stronger, the component forces Fx and F'x that are not involved in the opening/closing action of the cassette cover will also increase, and the rotation of the cassette cover will be increased. A large load is applied to the center, and there is a risk that the cassette lid and the cabinet may become uncoupled or misaligned, or that the cassette lid or the cabinet body may become deformed over time, causing damage.

(d) Means for Solving the Problems In order to solve the above-mentioned problems, the present invention has a cassette mounting recess formed in the cabinet, and a cassette mounting recess that can be freely rotated toward the cabinet to open and close the cassette mounting recess. The cassette lid is inserted into the insertion hole on the cabinet side at one end and through the insertion hole on the cassette lid side at the other end so as to rotate the cassette lid to the open position and the closed position. In a cassette lid opening/closing device comprising a torsion spring that rotates between two positions as the lid opens and closes, the cassette lid is adjusted between an open position and a closed position so that the amount of rotational displacement of the torsion spring is increased. One end (or the other end) of the torsion spring is configured to abut different positions on the inner edge of the insertion hole on the cabinet (or cassette lid) side.

(E) Function In the cassette lid opening/closing device of the present invention having the above-mentioned configuration, the amount of rotational displacement of the torsion spring can be increased, so the cassette lid can be opened and closed without increasing the opening/closing angle or the urging force of the torsion spring. The force for maintaining the cassette lid in the closed position and the open position can be strengthened to provide a sufficient sense of moderation in opening and closing.

(F) Embodiment An embodiment of the present invention will be described below with reference to the drawings. Note that parts that are the same as those in the prior art will be given the same drawing numbers and their explanations will be omitted.

That is, in the present invention, the torsion spring 5 is rotated between the open position and the closed position of the cassette lid 3 so that the amount of rotational displacement of the torsion spring 5 becomes large.
The other end 5b side is the insertion hole 7' of the cassette lid 3 side.
The structure is such that the positions of contact with the inner edge are different. Specifically, the insertion hole 7' on the side of the cassette lid 3 is formed in the shape as shown in FIG. It is possible to move from the solid line position to the dotted line position or from the dotted line position to the solid line position in FIG.

Therefore, in the cassette lid opening/closing device of the present invention having such a configuration, the amount of rotational displacement of the torsion spring 5 (indicated by the solid line in FIG. 2) accompanying the opening/closing operation of the cassette lid 3 is
can be made larger than the conventional rotational displacement (indicated by the dotted line in Figure 2), so that the component forces fy, f'y in the opening/closing direction at the closing and opening positions of the cassette lid 3
Increase fy > Fy, f′y > F′y, and horizontal component force
fx and f′x can be made small as fx<Fx, f′x<F′x. In addition, at the _P3 position where the direction of the component force involved in opening and closing the cassette lid 3 changes, the torsion spring 5
The other end 5b fits into the recess of the insertion hole 7',
When the cassette lid 3 rotates in the opening direction from this _P3 position, an upward component force f'y is generated, and the other end 5b of the torsion spring 5 moves along the inner edge of the insertion hole 7' in the direction of the dotted line position in Figure 1. From this P ₃ position, open the cassette lid 3.
When it rotates in the closing direction, a downward component force fy is generated, and the other end 5b of the torsion spring 5 moves along the inner edge of the insertion hole 7' in the direction of the solid line in FIG.

Next, FIG. 3 shows another embodiment of the present invention, in which one end 5a of the torsion spring 5 is adjusted between the open position and the closed position of the cassette lid 3 so that the amount of rotational displacement of the torsion spring 5 is increased. It is constructed so that the positions at which the two sides abut against the inner edge of the insertion hole 6' on the side of the cabinet 2 are different. Specifically, the insertion hole 6' on the side of the cabinet 2 is inserted into the third hole.
It is formed into a semicircular shape as shown in the figure, and one end 5a side of the torsion spring 5 moves the inner edge of the insertion hole 6' from the solid line position to the dotted line position in FIG. 3 or from the dotted line position to the solid line position in FIG. It was designed so that it could be moved to.

Therefore, even in the cassette lid opening/closing device having such a configuration, the amount of rotational displacement of the torsion spring 5 (indicated by the solid line in FIG. 4) accompanying the closing operation of the cassette lid 3 is
can be made larger than the conventional rotational variable position (shown by the dotted line in Figure 4). Therefore, for example, the component force fy in the closing direction at the closing position of the cassette lid 3 can be made fy>
It is possible to increase Fy and decrease the horizontal component force fx to fx<Fx. The same applies to the opening operation of the cassette lid 3.

(g) Effects of the invention As described above, according to the invention, a cassette mounting recess formed in the cabinet, a cassette lid rotatably provided on the cabinet side to open and close the cassette mounting recess, One end is inserted into the insertion hole on the cabinet side, and the other end is inserted into the insertion hole on the cassette lid side, so that the cassette lid is rotated to the open and closed positions as the cassette lid is opened and closed. In a cassette lid opening/closing device consisting of a torsion spring that rotates between two positions, the amount of rotational displacement of the torsion spring can be large, so even if the opening/closing angle of the cassette lid is small,
By increasing the force for maintaining the cassette lid in the closed position and the open position, it is possible to provide a sufficient sense of moderation when opening and closing the cassette lid. In addition, unlike in the past, the force of the torsion spring is not increased more than necessary, so there is no risk of applying a large load to the center of rotation of the cassette lid, and there is no risk of the cassette lid and the cabinet coming uncoupled or becoming misaligned. There is no risk of deformation of the cassette lid or cabinet over time.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment of the present invention, FIG. 2 is a diagram schematically showing the rotational displacement of the torsion spring, FIG. 3 is a diagram showing another embodiment of the present invention, and FIG. 4 is a diagram showing another embodiment of the present invention.
5 is a perspective view of a tape recorder used to explain a conventional example, FIG. 6 is a diagram showing the opening and closing operation of the cassette lid, and FIG. FIG. 7 is a diagram schematically showing the rotational displacement of the torsion spring. 1... Cassette mounting recess, 2... Cabinet, 3... Cassette lid, 5... Torsion spring,
6', 7'...Insertion hole.

Claims (1)

[Scope of utility model claims] A cassette mounting recess formed in the cabinet, a cassette lid rotatably provided on the cabinet side to open and close the cassette mounting recess, one end of which is connected to the insertion hole on the cabinet side, and the other end of which is connected to the cassette lid side. A cassette lid opening/closing device comprising a torsion spring which is inserted into each of the insertion holes of the cassette lid and rotates between two positions as the cassette lid is opened and closed in order to rotationally urge the cassette lid to its open position and closed position. In the apparatus, in order to increase the amount of rotational displacement of the torsion spring, the inner edge of the insertion hole on the side of one end (or the other end) of the torsion spring on the side of the cabinet (or the cassette lid) is different between the open position and the closed position of the cassette lid. A cassette lid opening/closing device characterized by being configured so as to come into contact with a position.