JPH045791Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a length adjustment mechanism for a gas spring used as an open stay or the like.

(Prior Art) Gas springs, such as those described in Japanese Patent Publication No. 19613/1982, are used as springs for holding automobile back doors, bonnets, copy machine covers, sliding roofs, etc. in open or closed states. Are known.

In this gas spring, a cylinder filled with gas is divided into two gas chambers by a piston fixed to a piston rod, and these gas chambers are communicated through a small hole formed in the piston. Gas flows through the holes to provide resistance to the expansion and compression of the gas spring.

(Problem to be solved by the invention) In the conventional gas spring described above, since the fully extended length is fixed, for example, when used in a back door, the upward opening degree of the back door is also fixed. Put it away. Therefore, the length of the gas spring is set to an average value, taking into account conditions such as the loading and unloading of luggage and the height of people.

Therefore, if the person opening and closing the back door is short, he or she may not be able to reach the back door when closing it, and if the person is tall, he or she may hit his or her head on the open back door, so they are forced to take an awkward posture. You won't get any more.

(Means for solving the problem) In order to solve the above problem, the present invention forms a plurality of groove-like steps on the outer peripheral surface of one end of the cylinder,
An atup joint having a bulge that can be engaged with this groove-like step and has an expansion habit is installed, and a holder with a groove that can be engaged with the bulge is installed on the outside of the atup joint in the axial direction of the cylinder. mounted so that it can be moved.

(Function) When the bulge part of the atupage joint is not engaged with the groove of the holder, the bulge part of the atupage joint is pressed against the groove-like step of the cylinder on the inner peripheral surface of the holder and fixed, and the holder is moved. By bringing the swollen portion of the attenuation joint into a state where it engages with the groove of the holder, the attenuation joint becomes free, so the attenuation joint can be moved and the overall length of the gas spring can be adjusted.

(Example) An example of the present invention will be described below based on the accompanying drawings.

Fig. 1 is an explanatory diagram showing an example of the gas spring according to the present invention being used as an open stay for a back door, Fig. 2 is an exploded perspective view of the gas spring, and Fig. 3 is a sectional view showing the adjustment process of the gas spring. It is.

A gas spring 1 is interposed between an automobile body 2 and a back door 3. This gas spring 1 has a piston rod 6 inserted into a cylinder 5 filled with gas, and a piston (not shown) that slides into the cylinder 5 attached to the tip of the piston rod 6, so that the inside of the cylinder 5 is divided into two gas chambers. A small hole is formed in the piston to communicate the two gas chambers.

Further, a collar 7 is fitted to the upper end of the cylinder 5, a plurality of groove-shaped steps 8 are formed on the outer circumferential surface of the collar 7, and an attachment joint 9 is formed in the collar 7.
is fitted. This attachment joint 9 has a bulge 10 at its lower end that can engage with the groove-like step 8 of the collar 7, and a plurality of slots 11 around the periphery to give the bulge 10 an expansion habit. ing.

A holder 12 is fitted onto the outer periphery of the uppipe joint 9 so as to be movable in the axial direction of the cylinder 5. At the upper end of the inner peripheral surface of this holder 9, there is a groove 13 in which a bulge 10 of the upper joint 9 can engage.
, and the inner diameter is the groove-like step 8 of the collar 7.
It has a diameter sufficient to press the bulging portion 10 of the uppage joint 9 therein. Further, a spring 14 is interposed between the holder 12 and the collar 7 to urge the holder 12 toward the upper joint 9.

The gas spring length adjustment mechanism configured as above will be explained.

First, as shown in FIG. 3A, when the bulging portion 10 of the uppage joint 9 is engaged with the groove-shaped step 8 at the innermost end of the collar 7 and not engaged with the groove 13 of the holder 12, The inner circumferential surface of the holder 12 presses and locks the bulge 10 of the upper joint 9 against the groove-like step at the innermost end of the collar 7, thereby fixing the upper joint 9 and the collar 7, that is, the cylinder 5. At this time, the total length of the gas spring 1 is the shortest, and when the back door 3 is opened, it is at the position shown by the imaginary line in FIG.

In order to increase the total length of the gas spring 1 from this state, as shown in FIG.
By moving the groove 13 of No. 2 to the position corresponding to the bulging portion 10 of the uppipe joint 9, the bulge portion 10 of the atpex joint 9 fits into the groove 13 of the holder 12 since it has been given an expansion habit. The upper joint 9 is unlocked by the holder 12 and becomes movable in the axial direction of the cylinder 5.

Therefore, after moving the attachment joint 9 and aligning it with an arbitrary groove-like step 8 on the collar 7, for example, the groove-like step 8 at the frontmost position as shown in FIG. By restoring the state, the bulging portion 10 of the atupation joint 9 comes out of the groove 13 of the holder 12, and the bulge 10 of the atupation joint 9 is pressed against the groove-like step 8 of the collar 7 on the inner peripheral surface of the holder 12. and the output joint 9 and collar 7, i.e. cylinder 5.
is fixed. In the state shown in FIG. 1C, the entire length of the gas spring 1 is the longest, and when the back door 3 is opened, it is in the position shown by the solid line in FIG.

(Effects of the invention) As explained above, according to the invention, a mechanism for locking and unlocking the cylinder and the attachment fitted to the cylinder is provided.
The length of the gas spring can be adjusted by releasing the lock, moving the atpuzzle joint in the axial direction of the cylinder, and locking it again. The opening degree can be adjusted.

[Brief explanation of the drawing]

Fig. 1 is an explanatory view showing an example of the gas spring according to the present invention being used as an open stay for a back door, Fig. 2 is an exploded perspective view of the gas spring, and Fig. 3 is a sectional view showing the adjustment process of the gas spring. It is. In the drawings, 1 is a gas spring, 2 is a body, 3 is a back door, 5 is a cylinder, 6 is a piston rod, 7 is a collar, 8 is a groove-shaped step, 9 is an upper joint, 10 is a bulge, and 12 is a holder. ,
13 is a groove, and 14 is a spring.

Claims (1)

[Scope of utility model registration request] In a gas spring in which a piston rod is inserted into a cylinder and a piston is attached to the piston rod to define two gas chambers within the cylinder, a plurality of groove-like steps are formed on the outer peripheral surface of one end of the cylinder, Attached to the outer periphery of this cylinder is an atupage joint having a bulge that can be engaged with the groove-like step and has an expansion habit, and furthermore, on the outside of this atupage joint is a groove in which the bulge of the atupage joint can engage. A length adjustment mechanism for a gas spring, characterized in that a holder formed with a holder is fitted so as to be movable in the axial direction of a cylinder.