JPH05582Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a stay damper whose extended state can be maintained by simple operation.

[Conventional technology]

Examples of stay dampers that can maintain an extended state include Utility Model Publication Nos. 40916/1986 and 60-
No. 40916 and No. 60-40916 have been proposed, but in both of these proposals, the piston rod holds an elastic cover, while the cylinder has an annular lock having an outer diameter larger than the inner diameter of the elastic cover. The pieces are arranged.

Within the normal stroke range, the stay damper expands and contracts with the inner circumference of the elastic cover remaining in sliding contact with the outer circumference of the annular locking piece, but when the stay damper is extended, the annular locking piece protrudes outward from within the elastic cover, releasing the sliding contact, and the open end of the elastic cover or its vicinity comes into contact with the end face of the annular locking piece, thereby maintaining the stay damper in its extended state.

[The problem that the idea aims to solve]

However, the above-mentioned conventional proposals have disadvantages such as lack of operability and difficulty in providing durability of the elastic cover.

That is, in the above-mentioned conventional proposal, since the inner circumference of the elastic cover is in sliding contact with the outer circumference of the annular locking piece, an unpleasant sliding contact sound is generated when the stay damper is extended or contracted, and the stay damper is In order for the stay damper to reach an extended state, it is necessary that the stay damper itself is formed to exert a considerably large extension force, but if the extension force is excessive, the extended state may be developed more than necessary. There is a problem with this.

In order to make the stay damper in the fully extended state expandable and retractable, it is necessary to insert the annular locking piece into the elastic cover while deforming the elastic cover, thereby reproducing the above-mentioned sliding contact state. First, when deforming the elastic cover, a considerable amount of operating force is required, making it difficult for people with limited strength to use it.

In addition, the elastic cover described above is formed of a highly elastic material such as a thin steel plate or plastic plate, but when it is formed of such a thin steel plate or plastic plate, the This has the disadvantage that it can easily break due to repeated deformation.

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, it is an object of the present invention to provide a new stay damper that does not lack in operability and has improved durability of its elastic cover.

[Means to solve the problem]

In order to achieve the above object, the structure of the stay damper according to the present invention is such that a cylindrical elastic cover is held on the protruding end of a piston rod that is inserted into a cylinder so as to be freely retractable. The elastic cover is so formed that it can be slid in the radial direction so that the opening end of the elastic cover comes into contact with a locking portion formed at the protruding and retracting end of the cylinder, thereby maintaining the extended state. This is what happened.

[Effect]

Therefore, it is possible to prevent the inner periphery of the elastic cover from slidingly contacting the outer periphery of the locking part when the stay damper is extended or contracted. The extension/cutting operation can be easily performed without requiring a large operating force.

Furthermore, since the inner periphery of the elastic cover does not come into sliding contact with the outer periphery of the locking portion when the stay damper expands and contracts, permanent deformation of the elastic cover is not repeated, and fatigue failure thereof can be prevented over a long period of time.

Furthermore, when the stay damper is extended or extended, the elastic cover is slid in its radial direction to bring its open end into contact with a locking portion formed at the protruding and retracting end of the cylinder to maintain the desired extended state. When the extension is released, the contact between the opening end of the elastic cover and the locking part is released by a so-called return sliding operation to the elastic cover, and the stay damper can be extended and retracted. can easily return to.

〔Example〕

Hereinafter, the present invention will be explained based on a preferred embodiment shown in the drawings.

As shown in FIG. 1a, the stay damper according to the present invention is formed by holding a cylindrical elastic cover 1 on the protruding end R1 of a piston rod R that is inserted into a cylinder C so as to be freely protrusive and retractable. The protruding and retracting end C1 has a locking portion 2 against which the opening end 1a of the elastic cover 1 comes into contact when the piston rod R is extended and extended.

The elastic cover 1 includes a cover portion 10 and a fishing rod 11.

In principle, the cover part 10 is formed so that its inner diameter is larger than the outer diameter of the protruding and retracting end C1 of the cylinder C. The opening end 1a of the elastic cover 1, which is the lower end of the cover part 10, is formed to have a diameter such that it comes into contact with the lower locking part 2 when sliding.

Further, the cover portion 10 has a length sufficient to shield the piston rod R, the protruding and retracting end C1 of the cylinder C, and the vicinity thereof from the outside during the normal expansion and contraction operation of the stay damper, and In some cases, the cylinder C is formed to have a length that makes the protruding and retracting end C1 of the cylinder C appear on the outside.

As shown in FIG. 1b, the fishing branch 11 is formed into a disc shape that matches the cross-sectional shape of the cover part 10, that is, a circular cross-section, and has a long hole bored from the center to the vicinity thereof. The protruding end R1 of the piston rod R is inserted into the perforation 11a.

A corrugated leaf spring 1 is placed inside the perforation 11a.
2 is housed therein, and the outer periphery of the protruding end R1 of the piston rod R is adjacent to the leaf spring 12.

That is, the leaf spring 12 has a spring portion 12a in the center.
It also has two wavy concave surfaces 12b and 12c that are connected to each other so as to sandwich the spring portion 12a, and the outer periphery of the protruding end R1 of the piston rod R is adjacent to one of the wavy concave surfaces 12b and 12c. I'm starting to let them do it.

Therefore, as shown in the figure, when the outer periphery of the protruding end R1 of the piston rod R is moved from being adjacent to one waveform surface 12b to being adjacent to the other waveform surface 12c, for,
The so-called protruding end R1 passes over the spring portion 12a of the leaf spring 12, and therefore the leaf spring 12 functions as a so-called detent mechanism.

In addition, the elastic cover 1 is attached to the lower piston rod R.
The fishing support 11 is held under pressure between the stepped portion R2 and the upper bracket B.
Ring seats 13 and 14 are interposed on the upper and lower surfaces of the spring 1, respectively, to prevent the leaf spring 12 from falling off to the outside.

In this embodiment, the locking portion 2 is an end surface C2 of the protruding and retracting end C1 of the cylinder C.

In this embodiment, the end face C2 is not specially structured to have a contact surface member, but may be provided with an appropriate contact surface member such as a rubber plate.

Since the stay damper according to the present invention is formed as described above, when the piston rod R comes out from inside the cylinder C with a large stroke and the stay damper is in the fully extended state, the protruding and retracting end C1 of the cylinder C comes out from inside the elastic cover 1. appears, and at this time,
The situation is such that the open end 1a of the elastic cover 1 can face the end surface C2 of the protruding and retracting end C1 of the cylinder C.

Under this situation, when the elastic cover 1 is slid in its radial direction so as to move the protruding end R1 of the piston rod R within the perforation 11a consisting of the elongated hole, as shown in FIGS. 2a and 2b, Then, the elastic cover 1 moves eccentrically with respect to the piston rod R, so that the open end 1a of the elastic cover 1 faces and comes into contact with the end surface C2 of the protruding and retracting end C1 of the cylinder C. You will be in a situation where you will be

Thereafter, even if the stay damper is compressed, the open end 1a of the elastic cover 1 and the end surface C2 of the protruding and retracting end C1 of the cylinder C become a so-called stopper structure to prevent the stay damper from being extended or extended. maintain.

To release the maintenance of the fully extended state, the elastic cover 1 is slid in the radial direction in the return direction, and the protruding end R1 of the piston rod R is
moves in the perforation 11a consisting of the elongated hole, and therefore the elastic cover 1 is returned to the state in which the piston rod R is inserted through its center, and the opening end 1a of the elastic cover 1 and the cylinder C move in and out. End C
1 is released from opposing the end surface C2 of the stay damper, and the stay damper can be compressed.

When the elastic cover 1 is slid, the leaf spring 12 in the perforation 11a functions as a so-called detent mechanism, and each sliding state can be easily maintained.

[Effect of idea]

As described above, according to the present invention, it is possible to prevent the inner periphery of the elastic cover from sliding against the outer periphery of the locking part when the stay damper is extended or contracted, and the generation of sliding contact noise that accompanies the extension or contraction operation of the stay damper can be prevented. Along with
There is an advantage that the stay damper can be extended and cut easily and comfortably without requiring a large operating force.

In addition, according to the present invention, since the inner circumference of the elastic cover does not slide against the outer circumference of the engagement portion when the stay damper is extended or contracted, the elastic cover is not subjected to repeated constant deformation. As a result, fatigue failure of the elastic cover can be prevented in the long term, which has the advantage of improving the durability of the stay damper.

Furthermore, according to the present invention, when the stay damper is extended, it is of course possible to easily maintain the desired extended state by sliding the elastic cover and bringing the open end into contact with the locking part. , When releasing the extension, by sliding the elastic cover back,
There is an advantage that the contact between the open end side of the elastic cover and the locking part can be released and the stay damper can be easily returned to the expandable and retractable state, and furthermore, in the present invention, the cylinder end surface can be used as it is as the locking part. Therefore, there is no need to separately provide a locking part, and there is an advantage that the number of parts can be reduced and the weight can be reduced.

[Brief explanation of the drawing]

FIG. 1a is a partially cutaway front view of a stay damper according to an embodiment of the present invention, FIG. 1b is a cross-sectional view taken along line bb in FIG. 1a, and FIG. 2 is a partial front view showing the operating state in the same manner as FIG. 1a, and FIG. 2b is a cross-sectional view taken along line bb in FIG. 2a. Explanation of symbols: 1...Elastic cover, 1a...Opening end, 2...Locking portion, C...Cylinder, C1...Protruding and retracting end, R...Piston rod, R1...Protruding end.

Claims (1)

[Scope of utility model registration request] A cylindrical elastic cover is held on the protruding end of the piston rod that is inserted into the cylinder so as to be freely retractable.
During the extension stroke of the piston rod, the cover is slid in the radial direction so that the open end of the elastic cover comes into contact with a locking portion formed at the protruding and retracting end of the cylinder, thereby maintaining the extended state. A stay damper characterized by being formed as follows.