JPS632677Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a gas damper that is applied to, for example, a back door stay structure of an automobile, and particularly to a gas damper whose displacement can be adjusted.

Conventionally, for example, in the back door of a lift bag type automobile, a gas spring is used to bias the door in the direction of relative extension of the cylinder and piston rod in order to bias the door in the normally open direction.

However, since conventional gas springs are always energized to the maximum extension state, if this is used as a direct means of opening the back door, the opening height when the door is opened will be constant, and the height will vary depending on the worker's height, etc. If it is too high or too low, there are problems such as poor workability.

In view of the above circumstances, the present invention provides a gas damper that can adjust the maximum relative extension of the cylinder and piston rod, thereby making it possible to adjust the opening of applicable doors, etc., and contributing to improving the workability of various equipment. The purpose is to

In the gas damper according to the present invention, the tension member attached to the piston rod is arranged to be slidable to the cylinder, and the tension member is provided with an adjustment member so as to be adjustable and movable in the longitudinal direction of the piston rod, and the tension member is engaged with the adjustment member. providing the cylinder with possible engagement means;
Relative extension is stopped at a position where the adjusting member and the engaging means engage. Thereby, the amount of extension can be adjusted by relative movement between the adjustment member and the tensile body.

Embodiments of the present invention will be described below with reference to the drawings.

In the gas spring according to this embodiment, the cylinder 10 and piston rod 12 shown in FIG. 1 are biased in the direction of relative expansion by the action of sealed gas.

An example of the structure inside the cylinder 10 will be explained with reference to FIG. A piston 14 is fixed to the end of the piston rod 12 inside the cylinder 10 and is movable in the longitudinal direction of the cylinder 10 while maintaining airtightness.

The deepest part 10 of this piston 14 and cylinder 10
A free piston 16 for gas blockage is fitted between the piston A and the piston A, and like the piston 14, it is movable in the longitudinal direction of the cylinder 10 while maintaining airtightness. Further, a fixing ring 18 is attached to the inlet of the cylinder 10 to secure the piston rod 12.
The piston rod 12 is inserted therethrough and is airtightly fitted to the piston rod 12.

Here, between the deepest part 10A of the cylinder 10 and the free piston 16 is a gas chamber 20 filled with high pressure gas, and the free piston 16 and the piston 14
and between the piston 14 and the fixing ring 18, a rear liquid chamber 22 and a front liquid chamber 2 are filled with oil, respectively.
It is said to be 4. The rear liquid chamber 22 and the front liquid chamber 24 communicate with each other via a through hole 26 formed in the piston 14.

Therefore, the oil in the liquid chambers 22, 24 receives the pressure of the gas chamber 20 via the free piston 16, and is always at a predetermined pressure. However, the pressure exerted by the oil in the front liquid chamber 24 on the sliding body 14 is less than the pressure by the oil in the rear liquid chamber 22 by the cross-sectional area of the piston rod 12.

Therefore, the piston 14 is always subjected to a relative extensional force in the direction in which it is pushed out from the cylinder 10, and the ring 10B provided at the end of the cylinder 10 and the ring 12A at the tip of the piston rod are urged in the direction of separating from each other. will be done.

If the rings 10B and 12A are attached to the vehicle body 28 and the flip-up hinge type back door 30, respectively, as shown in FIGS. 3 and 4, the back door 30 will always receive an urging force in the direction of opening.

An end surface 36A of the outer cylinder 36 is located between the collar 32 protruding near the ring 12A of the piston rod 12 and the nut 34 screwed onto the piston rod 12.
is being held. Therefore, the outer cylinder 36 is fixed to the piston rod 12 and is adapted to move together with the piston rod 12.

An outer cylinder 36 fixed to the piston rod 12 is slidably fitted into the cylinder 10, and the cylinder 10 moves along the inner surface of the outer cylinder 36 in the axial direction (up and down). A key groove 38 is formed in the outer cylinder 36 along the axial direction by boring through the peripheral wall of the cylinder 1.
The key 40 protruding from the outer peripheral surface of the
It is slidably inserted into the inside. In addition, keyway 3
8 has a length sufficient to allow movement of the cylinder 10.

Further, a thread groove 42 is carved on the outer peripheral surface of the outer cylinder 36 over a predetermined axial length depending on the adjustment range, and when the key 40 comes into contact with the thread groove 42, the cylinder 10 A nut 44 serving as a stopper for regulating the movement of the cylinder 10 is located on the extension side of the cylinder 10 (closer to the ring 10B) and is screwed into the key 40. Note that this nut 44 may be a double nut.

According to the gas spring having such a configuration, the extension range of the cylinder 10 is limited to the extent that the key 40 is connected to the nut 44.
For example, when the nut 44 is placed in the position shown in FIG. 1, the extension range is expanded, and the back door 30 opens to a high position as shown by a in FIG. 3. Further, when the nut 44 is placed in the position shown in FIG. 1, the extension range is reduced, and the back door 30 opens and stops at a low position, for example, as shown by b in FIG. 4.

Therefore, the operator can adjust the position of the nut 44 according to his or her height and set the opening height of the back door 30. Furthermore, the adjustment operation is extremely easy since it is only necessary to rotate the nut 44.

In the above embodiment, an example of application to a back door of an automobile has been described, but it goes without saying that the invention can be applied to various other devices. Further, although an example of use has been shown in which the cylinder side is fixed to the vehicle body, it goes without saying that the piston rod side can also be used with the piston rod side fixed.

Further, in the above embodiment, a combination of the outer cylinder 36, the nut 44, and the key 40 is used to regulate the amount of relative expansion, but instead of the outer cylinder 36, a tensile member having a tensile member that can sufficiently withstand the pressure of the cylinder is used. using nut 44
Instead, an adjusting member movable relative to the tensile member may be attached, and instead of the combination of the key 40 and the nut 44, an engaging means capable of engaging with the adjusting member may be provided. Furthermore, it goes without saying that the structure for generating the relative stretching force is not limited to the structure shown in FIG.

As described above, in the gas damper according to the present invention, the amount of relative expansion is limited by the tensile member attached to the piston rod, the adjustment member provided on the tension member, and the engagement means that can engage with the adjustment member. It is possible to adjust the relative extension range of the cylinder and the piston rod, and the opening degree of the applicable door can be adjusted, thereby providing an excellent effect of contributing to improving the workability of various devices.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a front view partially showing the structure of the gas damper, and Fig. 2 is a sectional view showing the internal structure of the cylinder.
3 and 4 are side views showing the state in which the present invention is applied to a back door of an automobile. 10...Cylinder, 12...Piston rod,
36...outer cylinder, 40...key, 44...nut.

Claims (1)

[Scope of utility model registration request] In a gas damper in which a cylinder and a piston rod are biased in a direction of relative extension by the action of a filled gas, a tension member attached to the piston rod is slidably disposed in the cylinder, and an adjustment member is attached to the tension member. The cylinder is provided with an engaging means capable of engaging with the adjusting member, and the relative extension is stopped at a position where the adjusting member and the engaging means are engaged. gas damper.