JPS6226866Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an opening/closing device for a lid body which is pivotally supported at its lower end in a main body so as to be openable and closable and is opened by its own weight.

As a device equipped with such a lid opening/closing device, the applicant of the present application filed Utility Model Registration Application No. 55653 on April 22, 1980, entitled "Record Mounting Mechanism for Record Player," etc. We proposed a dust cover that can be opened and closed. This device has a structure in which a record is mounted vertically on the player body, and when the dust cover is closed, either side of the record is selectively played using a pick-up mechanism provided on the player body side or the dust cover side. ing.

However, with such existing proposals, because the weight of the dust cover itself greatly affects its opening and closing due to its structure, questions arise particularly regarding the opening and closing operations. In other words, when the dust cover is rotated to open by its own weight, the moment in the opening direction increases as the dust cover is opened, and when the opening is completed, a considerable impact is applied to the member that regulates the opening position and the player body. In the worst case, the device may fall over.

This invention uses a damper mechanism to slow down the opening/closing speed of the dust cover as a lid body, and uses a spring to bias it in the opening direction only near the closed position where the moment due to the dust cover's own weight cannot overcome the resistance of the damper mechanism. After that, the dust cover's own weight is effectively used to open the dust cover, and a smooth opening operation that does not impair the quality of the product is achieved with a simpler mechanism. be.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an external perspective view of the device according to the present invention. In the figure, the dust cover 1 is attached at its lower end to the player body A by a support shaft 1a, and is shown in an open state. Although not shown, the inner surface of the dust cover 1 is provided with a pickup mechanism and a pressure bonding member for pressure-holding the record on the turntable 2. As shown in FIG. 2, the dust cover 1 is also connected to the base plate 5 of the player body by two pairs of links 3, 4 and 3', 4'. As shown in FIG. 5, a damper device D having a well-known structure is interposed at the connecting portion of each link 3, 4. To explain this in detail, the link 3 whose one end is pivotally supported by the substrate 5
A disc 6 is attached to the link 4, and a case 7 is attached to the link 4, which is pivotally supported at one end to the dust cover 1.
are fixed, and a highly viscous liquid 8 such as grease is interposed between the two links, so that when the two links rotate relative to each other, resistance is exerted and the movement is performed smoothly. Further, as clearly shown in FIG. 4, the one end of the link 3 on the side of the player body is pivotally supported on the bent portion 5a of the base plate 5 by a support shaft 9. As shown in FIG. A dragonfly spring 10 is supported on the support shaft 9, one end 10a of which corresponds to the link 3, and the other end engaged with the base plate 5. In the closed state shown in FIGS. 2 and 6, one end thereof is brought into contact with the link 3 and biased in the opening direction. Further, the dust cover 1 is locked in the closed state by a locking mechanism (not shown), but the spring 10
Vibrations and rattles that adversely affect the player are prevented by this energization.

The present invention is constructed as described above, and its opening operation will now be explained. Now, when the lock is released from the closed state shown in Fig. 2, the dust cover 1 will be
When energized, it begins to rotate counterclockwise, that is, in the opening direction. When the dust cover 1 begins to open and rotate,
The moment in the opening direction due to the dust cover's own weight gradually increases, but at the same time, the biasing force of the spring 10 gradually decreases, and the moment due to the dust cover's own weight overcomes the resistance of the damper D, as shown in Fig. 3. When the size of the spring 10 is large enough to open the dust cover 1, the spring 10 almost returns to its original state and loses its biasing force, and its operating end 10a is regulated by the bent portion 5a of the base plate 5 to prevent it from wobbling unnecessarily. Ru. Thereafter, the dust cover 1 further rotates to open due to its own weight, and the opening operation is completed when the locking protrusion 3a of the link 3 comes into contact with the side end of the link 4, as shown in FIG. During the above opening operation, damper D is always
The resistance acts to make the movement smoother.

When closing the dust cover, the operation is completely opposite to the above. Since the present invention is constructed as described above, the opening force is applied to the opening/closing mechanism using the damper only in the initial stage, and the damping effect of the applied force is applied as it is, so that the lid body can be opened. Since the moment in the direction is always kept almost constant, the opening and closing operations of the lid body can be performed smoothly.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing the dust cover of a record player equipped with an embodiment of the opening/closing device according to the present invention, and FIGS. 2 to 4 show the operation of the record player when the dust cover is opened. Explanatory drawings showing the state over time, FIGS. 5 and 6 are a sectional view and a perspective view of essential parts of the record player. A: Player body, 1: Dust cover.

Claims (1)

[Scope of utility model registration request] In a device that opens and closes a lid which opens and closes the front of the main body by its own weight, the lid is pivotally supported at its lower end on the front surface of the main body, and a connecting means for connecting the main body and the lid is provided with a lid that is supported by the dead weight of the lid. A method for opening and closing a lid body, characterized in that a damper mechanism is provided to resist the movement, and biasing means is provided between the main body and the lid body to apply a biasing force in the opening direction to the lid body when the lid body is closed. Device.