JPH1088899A - Door turning damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide surely a desired performance without being affected by climate or condition of finishing. SOLUTION: This door turning damper comprises a shaft 2, which is unmovably housed in a main body case 1 in the axial direction, a slider 3 which is unturnably housed in the main body case 1, a coil spring 4 which is housed between the bottom 1a of the main body case 1 and the slider 3 and a ball which is supported in a groove 3a in the diameter direction of the slider 3 and fitted in a spiral groove 2a on the peripheral surface of the shaft 2. Due to this construction, when the shaft 2 is turned by opening and or closing the door, the slider 3 moves linearly toward the bottom 1a of the main body case 1 by the ball moving along the spiral groove 2a so that the coil spring 4 may be compressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary damper used for a door of a vehicle luggage storage case.

[0002]

2. Description of the Related Art A conventional rotary damper uses a viscous resistance, a rotation ratio, and a frictional resistance of oil, gears, fur, and the like to provide rotational resistance to a rotation axis of a door, thereby reducing a speed when the door is closed. ing.

However, in the above type,
Since the performance varies depending on the state of temperature and the state of completion at that time, the opening / closing speed of the door cannot be reliably controlled.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a rotary damper for a door that can reliably achieve required performance without being affected by the temperature or the finished condition.

[0005]

The rotary damper according to the present invention will be described below with reference to the reference numerals in the accompanying drawings. Between the slider 3 and the bottom part 1 a of the main body case 1, which is housed in the main body case 1 and the slider 3, which is rotatably inserted into the main body case 1 and is rotatably fitted in the main body case 1. And a ball 6 carried in a diametrical groove 3a of the slider 3 and fitted in a spiral groove 2a on the peripheral surface of the shaft 2.

When the door is rotated in the opening direction, the shaft 2 rotates in conjunction with the rotation axis 8 of the door, and the ball 6 moves along the spiral groove 2a of the shaft 2, whereby the slider 3 The case 1 is linearly moved toward the bottom 1a. Therefore, the coil spring 4 is compressed between the slider 3 and the bottom 1 a of the main body case 1. During the initial movement in which the amount of compression of the coil spring 4 is small, the opening rotation of the door is lightened without receiving a large resistance. When the opening of the door reaches the final stage, the amount of compression of the coil spring 4 is maximized, so that the opening rotation of the door receives a large resistance.

When the hand is released from the door after the door is opened, the coil spring 4 is elastically restored in the extension direction, so that the slider 3 moves linearly away from the bottom 1a of the main body case 1, and the door automatically moves in the closing direction. Rotated. The speed of the closing rotation of the shaft 2 is high at the time of initial movement, and as the door is closed, the rotation speed of the shaft 2 becomes slow and the door is gradually closed.

[0008]

In the illustrated embodiment, the slider 3 has a hexagonal outer shape, and is accommodated in a hollow portion 1d of a hexagonal cross section of the main body case 1 so as not to rotate. Slider 3
A stop plug 7 is fitted and fixed to the outer end of the groove 3a so that the ball 6 contained therein does not fall out of the groove 2a.
A stopper flange 2b is provided at the base end of the shaft 2, and is engaged with the step 1b at the base end of the main body case 1. The tip of the shaft 2 is fitted into the shaft hole 1c of the bottom 1a of the main body case 1, and the shaft stopper plate 5 is fitted and fixed in the annular groove 2c at the tip of the shaft 2. The main body case 1 is accommodated in the door in a non-rotatable manner.

[0009]

As described above, according to the present invention, the shaft 2
The slider 3 is linearly moved by the ball 6 moving along the spiral groove 2a, and the resilience of the coil spring 4 compressed by the slider 3 is used for the rotation resistance. The required damper function can be reliably obtained without being affected by the above.

[Brief description of the drawings]

FIG. 1 is a front view of a rotary damper for a door according to an embodiment of the present invention.

FIG. 2 is a right side view of the rotary damper.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a sectional view taken along line AA when only the main body case and the coil spring are cut.

FIG. 5 is a sectional view taken along line BB of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body case 2 Shaft 3 Slider 4 Coil spring 5 Shaft stopper plate 6 Ball 7 Stopcock

Claims (1)

[Claims] 1. A shaft 2 which is accommodated in a main body case 1 so as to be immovable in an axial direction and rotates in conjunction with a rotation shaft 8 of a door;
A slider 3 housed in the main body case 1 so as to be non-rotatably and rotatably fitted with the shaft 2; and a coil spring 4 housed in the main body case 1 and compressed between the slider 3 and the bottom 1a of the main body case 1. And a ball 6 carried in a diametrical groove 3a of the slider 3 and fitted in the helical groove 2a on the peripheral surface of the shaft 2. When the shaft 2 rotates by opening and closing the door, the ball 6 moves along the helical groove 2a. The door 3 is a rotary damper in which the slider 3 is linearly moved toward the bottom 1a of the main body case 1 by the moving ball 6, and the coil spring 4 is compressed.