JPH0329802Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a damper device used in a cassette door opening mechanism of a cassette tape recorder.

[Problem that the invention attempts to solve]

As shown in Fig. 3, in recent vertical type cassette tape recorders, the cassette door 1 is attached to the lower support
It is designed to open forward with the center at the center. A cassette tape is inserted from above into a cassette door 1 in an open state (dashed line state), and by closing the cassette door 1, the cassette tape is loaded onto a reel stand (not shown). A protrusion 1a is provided on the side surface of the cassette door 1, and an arm 3a of a torsion spring 3 having one end hooked to the tape recorder main body 7 is hung on this protrusion 1a. The cassette door 1 is connected to this torsion spring 3.
is urged in the opening direction by the elastic force of. Further, the cassette door 1 is provided with a lock piece 1b, and the lock lever 4 is engaged with this lock piece 1b when the cassette door 1 is closed. This lock lever 4 rotates around a fulcrum 5, and is biased clockwise in the figure by a coil spring 6. Further, an air damper device 8 is fixed to the main body 7 between the cassette door 1 and the tape recorder main body 7 with screws.
The air damper device 8 has a through hole 9a at the bottom as shown in FIG.
Grease is applied to the inner wall of the cylinder 9 to which an adjusting screw 10 having a head 10a for engaging a screwdriver is screwed, and a piston 12 that slides on the inner wall via a packing 11 is provided and integrated with the piston 12. The hole 13a of the rod 13 is shown in FIG.
It has a structure connected to a. Cassette door 1
When the lock lever 4 is closed, when the lock lever 4 is rotated counterclockwise as shown by the chain line, the lock lever 4 is unlocked from the cassette door 1, and the cassette door 1 is opened clockwise by the elastic force of the torsion spring 3. . During this opening operation, the air damper device 8 works to allow the opening to occur slowly. The opening speed of the cassette door 1 can be adjusted by turning the adjustment screw 10 screwed onto the bottom of the cylinder 9 in the tightening direction.
This makes it difficult for air to enter between the and adjustment screw 10, which slows down the process.On the other hand, if you turn it in the direction of loosening, it becomes easier for air to enter, making it faster.

However, in such a damper device, as shown by the solid line graph A in FIG. 5, the adjustment range of the adjusting screw 10 is very narrow, making it difficult to obtain an appropriate opening speed of the cassette door.

[Means for solving problems]

The present invention provides a damper consisting of a cylinder having a through hole at the bottom and an adjusting screw screwed into the through hole, and a piston that reciprocates within the cylinder. This damper device is characterized in that the vertical line is cylindrical, and the imaginary line touching the bottom of the screw root is tapered conical, making it easy to adjust the opening speed of the cassette door.

[Example of idea]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a cross-sectional view showing a damper device of the present invention, and FIG. 2 is a cross-sectional view of an adjusting screw used in the present invention.

First, 108 in FIG. 1 is a damper device, and 1
09 is a cylinder made of plastic material and provided with a through hole 109a at the bottom. Further, a gasket 111 is provided on the inner edge of the cylinder 109, and a piston 112 is fitted in the cylinder 109 so as to be slidable left and right. Further, in the through hole 109a, the imaginary line A touching the top of the screw thread shown in FIG. An adjustment screw 100 having a head 100a with a groove that fits into a screwdriver.
is screwed on.

Next, the operation of the present invention having the above configuration will be explained. First, the operation when this damper device is attached to the cassette tape recorder shown in FIG. 3 in place of the damper device indicated by reference numeral 8 will be explained.

When the cassette door 1 is closed to the solid state against the elastic force of the torsion spring 3 and the lock piece 1b is locked by the lock lever 4, the damper device is contracted to the state shown in FIG. In this state, when the lock lever 4 is rotated to release the lock on the lock piece 1b, the cassette door 1 is opened by the elastic force of the torsion spring 3, but due to the sliding of the cylinder 109 and the piston 112. Therefore, the cassette door 1 moves smoothly without being shocked by the elastic force of the torsion spring 3. At that time, as the cylinder 109 moves, the air in the interior 113 of the cylinder 109 flows through the through hole 109a at the bottom of the cylinder 109 and the thread trough 100c of the adjusting screw 100 screwed into the through hole 109a. It is designed to flow in through a small gap between them. The air inflow speed can be adjusted by screwing in the adjusting screw 10.
By unscrewing the screw, the opening speed of the cassette door 1 shown in FIG. 3 can be increased, and by screwing it back, the opening speed of the cassette door 1 can be adjusted to be slow.

In addition, Figure 5 is a characteristic diagram according to the present invention, where the horizontal axis shows the number of rotations of the screw, the vertical axis shows the opening speed of the cassette door, and the chain line A shows the characteristics when using the conventional damper device. In the case, solid line B
shows the characteristics when using the damper device of the present invention.

[Effect of idea]

According to the present invention, in a damper device comprising a piston that reciprocates within a cylinder having a through hole at the bottom and an adjusting screw screwed into the through hole, a virtual The damper device is characterized in that the line is cylindrical and the virtual line in contact with the bottom of the thread is tapered into a cone, so the gap formed between the through hole in the bottom and the bottom of the adjustment screw is Since the gap can be reliably and easily increased or decreased by rotating the adjustment screw, the amount of air flowing into the cylinder can be reliably adjusted, and a damper device with an appropriate opening speed can be provided.

Although an embodiment using air has been described, the damper device of the present invention can produce the same effect even if a liquid such as oil is used instead of air, and the present invention is not limited to an air damper device.

[Brief explanation of drawings]

Figures 1 and 2 show an embodiment of the present invention;
The figure is an enlarged view of the main parts of the damper device, FIG. 2 is a sectional view of the adjustment screw, FIG. 3 is a side view showing the cassette door opening/closing mechanism of a cassette tape recorder, and FIG. 4 is a sectional view showing a conventional damper device FIG. 5 is a characteristic diagram. 100...Adjustment screw, 100b...Screw thread, 1
00c...screw root, 108...damper device,
109...Cylinder, 112...Piston, 10
9a...Through hole, A...Virtual line touching the top of the screw thread, B...Virtual line touching the top of the thread root.

Claims (1)

[Scope of utility model registration request] In a damper device comprising a cylinder having a through hole at the bottom and an adjusting screw screwed into the through hole, and a piston reciprocating within the cylinder, an imaginary line touching the top of the screw thread of the adjusting screw. A damper device characterized by having a cylindrical shape and a conical line touching the thread root.