JP2534847Y2 - Lid opening and closing mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid opening / closing mechanism for a cassette lid of a cassette tape recorder or a disk lid of a CD player.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional lid opening / closing mechanism.

[0003] 1 is a cabinet, 2 is a lid, 3 is a torsion spring for urging the lid 2 in the opening direction, 4 is a support shaft serving as a fulcrum for opening and closing the lid 2, 5 is an arc gear provided on the lid 2,
Reference numeral 6 denotes a gear, which forms a damper by meshing with the arc gear 5.

Next, the operation of the lid opening / closing mechanism will be described.

In the lid closed state (solid line state), a large force in the opening direction is applied to the lid 2 by the torsion spring 3.

Accordingly, when the operation of opening the lid 2 is performed, the lid 2 is opened by the urging force of the torsion spring 3 in the opening direction, and finally the lid is opened as indicated by a broken line.

At this time, the opening speed of the lid 2 is relaxed by a damper composed of an arc gear 5 and a gear 6 meshing with the arc gear 5, so that a smooth lid opening operation is performed.

[0008]

However, in the conventional lid opening / closing mechanism, for example, in the case of a cassette tape recorder, the lid starts to open, and when the cassette tape comes off from the mechanical part of the main body, a large opening force is required due to the resistance of the cassette pressing spring and the like. Similarly, CD players also required a large opening force when the magnet came off the turntable.

Accordingly, since the lid of a cassette tape recorder, a CD player, or the like requires a large opening force at the beginning of opening, the lid opening spring needs to have a large force.

[0010] On the other hand, if the spring force is increased, the opening speed of the lid becomes too high, and the quality is lowered. Therefore, in order to maintain the quality, braking by a damper having a large torque is required, and a mechanism for enabling the braking by the damper must be incorporated into the lid opening / closing mechanism. There was a costly problem.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is provided with a first and a second torsion spring portions, and a torsion spring integrally formed by a single wire is provided. At the beginning of the opening of the lid, the lid is opened by the urging force of the two torsion springs, the urging by the first torsion spring is released during the opening, and the subsequent lid opening operation is performed by the second torsion spring. It is configured to be performed only by the power.

[0012]

At the beginning of opening when a large opening force is required due to the above configuration, the lid is opened by the urging force of the two torsion springs, and then the lid is opened gradually by the urging force of one of the torsion springs. become. Therefore, the opening speed of the lid can be adjusted without using a damper having a large torque, and the number of parts, the manufacturing cost, and the assembly time can be reduced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a lid opening / closing mechanism according to the present invention will be described in detail below.

FIG. 1 is a view showing a lid opening / closing mechanism according to an embodiment of the present invention, and FIG. 2 is a view showing a torsion spring used for the lid opening / closing mechanism. In FIGS. 1 and 2, portions common to FIG. 3 are denoted by common reference numerals.

Reference numeral 7 denotes a torsion spring for urging the lid 2 in the opening direction, which has a first torsion spring portion 71 and a second torsion spring portion 72, and is formed of a steel wire such as a piano wire or a stainless wire. . The first and second torsion spring portions 71, 72 are respectively provided with lid pressing arms 71a, 72a.
And cabinet pressing arms 71b and 72b, and coil portions 71c and 72c, and are integrally formed of one steel wire by connecting the cabinet pressing arms 71b and 72b to each other. The first torsion spring portion 71 has a smaller number of turns than the second torsion spring portion 72, so that its spring pressure is set to be higher than that of the second torsion spring portion 72. Reference numeral 8 denotes a shaft provided on the lid 2, which is inserted into the coil portions 71c, 72c of the torsion spring 7 to support the spring 7. In this state, the lid pressing arm 72a directly presses the back surface of the lid 2, The cabinet pressing arms 71b and 72b are the cabinet 1
It contacts the internal rib 1a. On the other hand, the lid pressing arm 71
a abuts inside the cabinet 1 with a rib 2a projecting from the back surface of the lid 2 and projecting into the cabinet 1 when the lid 2 is closed, and biases the lid 2 in the opening direction via the rib 2a.
The lid pressing arm 71a contacts the stopper 1b of the cabinet 1 while the lid 2 is being opened, and releases the bias on the lid 2.

Next, the lid opening operation will be described.

When the lid 2 in the closed state is unlocked, the lid 2 starts to be opened by receiving the urging force in the opening direction by the first and second torsion spring portions 71 and 72.

When the lid 2 that has started to open reaches the position indicated by the dashed line, the lid pressing arm 71a hits a stopper 1b provided on the cabinet 1. Therefore, the lid pressing arm 71a stops at that position and does not press the rib 2a of the lid 2 any more.

On the other hand, the lid pressing arm 72a keeps pressing the rear surface of the lid 2.

Therefore, after the lid 2 reaches the position indicated by the one-dot chain line, the force for urging the lid 2 in the opening direction is only the pressing force from the second torsion spring portion 72, which has a weak spring force, and the opening speed of the lid 2 is increased. Reaches a position shown by a broken line in which the lid is opened.

The present invention does not refuse the use of a damper. For example, if a damper having a small torque is used together,
A smoother opening operation can be obtained. The first and second torsion spring portions 71 and 72 may have the same spring pressure.

[0022]

As described above, the lid opening / closing mechanism of the present invention opens the lid by the urging force of the two torsion springs at the beginning of opening, and then gently opens the lid by the urging force of one of the torsion springs. In particular, there is no need to provide a damper, and since the first and second torsion springs are integrated, it is possible to reduce the number of parts, thereby reducing costs and assembling time.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of a lid opening / closing mechanism of the present invention.

FIG. 2 is a perspective view of a torsion spring used in the lid opening / closing mechanism of the present invention.

FIG. 3 is an explanatory view showing an embodiment of a conventional lid opening / closing mechanism.

[Explanation of symbols]

 Reference Signs List 1 cabinet 2 lid 4 support shaft 71 first torsion spring 72 second torsion spring 8 shaft

Claims (1)

(57) [Scope of request for utility model registration] 1. A lid opening / closing mechanism for opening a lid by an urging force of a torsion spring, comprising: a first torsion spring portion, a torsion spring integrally formed by a single wire, and a lid opening start. Opens the lid by the urging force of the two torsion springs, releases the urging by the first torsion spring during the opening, and performs the subsequent lid opening operation to the second
A lid opening / closing mechanism, which is configured to be performed only by the urging force of the torsion spring section.