JPS621133B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a mechanism for holding a stay damper at its maximum extension, which is employed, for example, in an opening/closing mechanism for a rear window of a station wagon type vehicle or a rear door of a van type vehicle.

In the conventional stay damper, as shown in FIG. 1, gas and oil are mixed and sealed in a cylinder 1 or are separated and sealed to generate a reaction force corresponding to the insertion volume of the piston rod 2. However, since the gas reaction force changes significantly with changes in temperature (due to Boyle-Shall's law), when it is attached to the rear window 3a of a car 3, the rear window 3a will strongly jump up at high temperatures, as shown in Figure 2. There were drawbacks such as the pressing force being strong when closing or closing the window, and the rear window 3a falling automatically when the temperature was low.

Therefore, in order to prevent this, some systems have mechanically incorporated a locking device into the stay damper 4 at the time of maximum extension, but with such a structure, locking (retention) cannot be confirmed visually from the outside, so again, It is necessary to check by pushing the rear window 3a hard, and if you accidentally push the rear window 3a too hard, the lock mechanism built into the small diameter cylinder 1 has a compact design, so it is not strong enough. It has the disadvantages that it is weak and easy to break, and the locking mechanism is complicated and expensive.

On the other hand, as shown in Japanese Patent Publication No. 53-16873, there are some devices in which the lock can be confirmed visually from the outside, but in such a structure, when the arm part of the latching member is pressed inward to lower the tubular member, It was easy for fingers to get caught between the tubular member and the cylinder body, and there was a risk of injury.

An object of the present invention is to provide a mechanism for holding a stay damper at its maximum extension, which has a completely new structure and does not have the above-mentioned drawbacks. Hereinafter, details of the present invention will be explained using examples shown in the drawings.

FIG. 3 is a perspective view showing an embodiment of a stay damper having a maximum extension holding mechanism according to the present invention. In the same figure, the reference numeral 5 indicates a cylinder filled with gas and oil; A piston rod is fixed to a piston (not shown) that is slidably inserted into the cylinder 5 and has the other end protruding outside the cylinder 5. A substantially tubular cover 7 is fixed thereto, which acts as a shield. The cover 7 is made of an elastic material, and has an inner diameter larger than the outer diameter of the cylinder 5 so that it can slide up and down with respect to the cylinder 5.
A portion of the lower part 7a of the piston rod 6 is cut off.
When the cylinder 5 is extended to its maximum extent, it is biased by a coil spring 9 (described below) so that the upper edge 7c of the cutout 7b comes into contact with a bearing 8 located at the upper end of the cylinder 5.

On the other hand, a coil spring 9 is interposed between the lower part 7a of the cover 7 and the upper end of the cylinder 5. This coil spring 9 is attached to a spring holder 10 fixed to the upper end of the cylinder 5.
and a slider 11 which slides elastically against the inner wall surface of the cover 7, and is loaded and held between the cover 7 and a slider 11, which constantly applies an urging force to the cover 7 in the opposite direction to the cylinder 5. The above-described coil spring 9, spring holder 10, and slider 11 constitute a biasing means.

The stay damper 12 configured as described above is
It is particularly suitable for supporting upwardly opening rear windows of automobiles in the open position, and suitable examples include upwardly opening rear windows of station wagons or rear doors of van-type automobiles. In addition, mounting part 1
3 and 14 are connected to the vehicle body and the rear window (rear door), respectively.

By the way, FIG. 3 shows a state in which the piston rod 6 is protruded to the maximum extent outside the cylinder 5, that is, the stay damper 12 is in the most extended state. In this state, the lower part 7a of the cover 7 is held by the coil spring 9. At the same time, the upper edge 7 of the cutout 7b is biased in the opposite direction to the cylinder 5.
Bearing 8 where c is located at the upper end of cylinder 5
Therefore, even if the cover 7 is pressed downward, the upper edge 7 of the cutout portion 7b
Due to the engagement relationship between c and the bearing 8, the cover 7
is prevented from moving downward, and the stay damper is held in its fully extended state. In other words, the rear window (rear door) is supported in the open position.

On the other hand, when compressing the stay damper 12, that is, when closing the rear window (rear door), the cover 7
By pushing the portion corresponding to the slider 11 toward the cylinder 5 against the elasticity of the coil spring 9, it becomes possible to slide the cover 7 in the downward direction relative to the cylinder 5. can easily be compressed.

In the above embodiment, the coil spring 9 is arranged between the cylinder 5 and the cover 7 via the spring holder 10 and the cylinder 11, but as shown in FIG. A plate spring 15 having a substantially U-shaped cross section is spot-welded to the upper end of the cylinder 5,
It may be used instead of the biasing means consisting of the coil spring 9, spring holder 10, and slider 11 described above. Of course, even with such a structure, effects equivalent to those of the first embodiment described above can be obtained.

In addition, as shown in FIG. 5, the cover 7 is mounted eccentrically with respect to the piston rod 6, and the material of the cover 7 is made slightly soft, so that the cover 7 is placed on the bearing 8 located at the upper end of the cylinder 5 when it is fully extended. The structure may be such that a biasing means is provided so that the lower end surface 7d of the holder is automatically placed on the holder. In this case, if it is desired to increase the compressive strength, the cover cap 7e may be made soft.

Note that if only one stay damper is installed on the vehicle body, the mechanism of the present invention may be applied to that one stay damper, and if two stay dampers are installed to the vehicle body, the mechanism of the present invention may be applied to one of the stay dampers. All you have to do is adopt it. In other words, if both were used, it would be difficult to close the door.

As explained above, according to the present invention, a cover formed to surround the piston rod is fixed to a piston rod whose one end is fixed to a piston inside the cylinder and whose other end projects outside the cylinder. When the stay damper is fully extended, it is automatically biased by the biasing means and engaged with the upper end of the cylinder, which prevents the rear window etc. from jumping up strongly when the temperature is high or the rear window when the temperature is low. Not only does it reliably prevent accidents such as objects falling automatically, but the structure is simple and can be manufactured at low cost.Furthermore, the structure allows the lock to be confirmed visually from the outside at all times, improving safety. In addition, when lowering the cover (i.e., closing the rear window, etc.), all you have to do is press lightly on the outer surface of the cover, so you don't get injured if your fingers get caught between the cover and the cylinder. It has an extremely excellent effect of not having to do anything.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional stay damper, FIG. 2 is a rear perspective view of an automobile showing an example of the stay damper of FIG. FIG. 4 is a sectional view of a main part showing another embodiment of the stay damper having the mechanism of the present invention, and FIG. 5 is still another embodiment of the stay damper having the mechanism of the present invention. FIG. 5-Cylinder, 6-Piston rod, 7-Cover, 7d-Lower end surface, 9-Coil spring, 1
0~Spring holder, 11~Slider, 1
5 ~ Leaf spring.

Claims (1)

[Claims] 1. A cover formed to surround the piston rod is fixed to a piston rod whose one end is fixed to a piston inside the cylinder and whose other end projects outside the cylinder. What is claimed is: 1. A mechanism for holding a stay damper at its maximum extension, wherein the stay damper is automatically biased by a biasing means and engaged with the upper end of a cylinder. 2. The biasing means includes a coil spring interposed between the cylinder and the cover, a spring holder fixed to the cylinder and holding one end of the coil spring, and a wall surface of the cover disposed on the other end side of the coil spring. and a slider in elastic contact with the first claim.
The mechanism for holding the stay damper at its maximum extension as described in section 2. 3. The stay damper retaining mechanism at maximum extension according to claim 1, wherein the biasing means is constituted by a leaf spring interposed between the cylinder and the cover and having one end fixed to the cylinder side. 4 The biasing means is installed with the cover eccentric to the piston rod, and the material of the cover is made slightly soft, so that when the stay damper is fully extended, the lower end surface of the cover automatically biases into engagement with the upper end of the cylinder. A mechanism for holding a stay damper at its maximum extension according to claim 1, constructed as follows.