JP2001078345A - Method for dividing elongation/contraction of multiple string telescopic absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To distribute telescopic absorption ratio of each string freely by providing an action point for dividing elongation/contraction at a middle point of the arm of a pantograph for dividing elongation/contraction. SOLUTION: A pantograph 5 is provided through rods 3, 4 between the fixed side (cable supporting base 1) and the movable side (bridge side: cable supporting base 2) and an action point for dividing elongation/contraction is provided at a middle point of the arm of the pantograph 5. The action point is arranged to insert a protrusion 51 on the arm of the pantograph 5 slidably into an elongated hole 61 made in a cable supporting member 6 intersecting the arm of the pantograph 5. According to the structure, elongation/contraction can be absorbed little at a limited space in a bridge and absorbed much at an unlimited space and thereby elongation/contraction being transmitted can be divided freely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the field of cable expansion and contraction technology attached to a bridge or the like, and is installed for the purpose of absorbing expansion and contraction of a bridge or the like by deformation of a cable.
The present invention relates to an expansion / contraction splitting method for a pantograph type multiple expansion / contraction absorber.

[0002]

2. Description of the Related Art FIGS. 3 (concrete configuration) and FIG. 4 (operational situation by skeleton) show a conventional multiple expansion / contraction absorber.
In this device, a small pantograph is arranged between a fixed side and a movable side, and the small pantograph is linked to the fixed side and the movable side.

Such a multiple-type telescopic absorber absorbs cables on a fixed side (support base), a movable side (support base), and a pantograph (central hinge portion) in the middle thereof (see FIG. 4). The structure is such that the expansion and contraction of a bridge or the like is equally divided and absorbed at each link between the cable support points. 3 and 4 show dimensions before and after expansion and contraction. As shown in FIG. 3, the expansion and contraction of 250 mm is equally divided and absorbed by 125 mm.

[0004]

In the case of the above-mentioned conventional multiple-type expansion / contraction absorber, expansion / contraction can only be absorbed equally in each series. For this reason, there is a disadvantage that the design of the entire apparatus is strongly defined to the minimum dimension of a bridge or the like.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an expansion / contraction splitting method for a multiple-type expansion / contraction device, which makes it possible to freely allocate the expansion / contraction ratio of each series in a multiple-type expansion / contraction mechanism. It is in.

[0006]

According to the present invention, there is provided a telescopic splitting method for a multiple telescopic absorption device, comprising the steps of: Are provided, and the expansion and contraction absorption ratio of each series is freely set to m: n.

The point of action is preferably formed by a combination of a projection provided on the arm of the pantograph and a long hole formed in the cable support member.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 show a preferred embodiment of a multiple expansion / contraction absorber according to the present invention. FIG. 1 shows a specific example, and FIG. 2 shows an operation state using a skeleton. .

In the apparatus of this embodiment, a pantograph 5 is provided between a fixed side (cable support 1) and a movable side (bridge side; cable support 2) via rods 3 and 4. Action point for splitting expansion and contraction in the middle of the arm (Fig. 2
M) is provided.

As shown in FIG. 2, the structure of the action point M is such that the cable support member 6 is provided so as to cross the arm of the pantograph 5 and the projection 51 provided on the arm of the pantograph 5 is formed by piercing the cable support member 6. The projection 51 is slidably inserted into the hole 61, and the projection 51 is attached to the elongated hole 6 in accordance with the expansion and contraction of the pantograph.
1, the cable support member 6 moves in the direction of expansion and contraction accompanying the change in the inclination of the arm of the pantograph 5.

The cable is fixedly supported by the fixed-side cable support 1, the movable-side cable support 2, and the intermediate cable support member 6 as indicated by reference numeral 7 in FIG. Movable side: absorbs expansion and contraction of bridges.

FIGS. 1 and 2 show dimensions between cable support points and dimensions before and after expansion and contraction. As shown in FIG. 1, an action point on the pantograph 5;
If it is provided at a position that is 1 / 4L (3 / 4L) with respect to the distance L between both ends, the expansion and contraction is divided into 1 / 4L: 3 / 4L = 1: 3. Therefore, when the expansion / contraction is divided into m: n, m: n
(Where m + n = L). In this way, the amount of expansion and contraction can be reduced in a portion where the space in the bridge is tight, and a large amount of expansion and contraction can be absorbed in a portion where there is sufficient space, and the transmitted expansion and contraction amount can be freely divided. .

FIGS. 1 and 2 show changes in dimensions before (upper) and after (lower) expansion and contraction when the expansion and contraction are divided into 1: 3. In the case of FIG.
mm: 187.5 mm. In the case of FIG.
125 mm: Divided into 375 mm.

It is necessary to divide the amount of expansion and contraction within a range that does not adversely affect cable deformation due to expansion and contraction (bending radius, fatigue, etc. of the cable). Further, in the above-described embodiment, the two expansion / contraction absorbing devices are shown, but the method of the present invention can be applied to three or more devices.

[0015]

As described above, according to the present invention, an expansion / contraction splitting method for a multiple-type expansion / contraction device capable of freely distributing the expansion / contraction ratio of each series in a multiple-type expansion / contraction absorption mechanism. To achieve the intended purpose of providing, providing more design freedom compared to the traditional equal split method,
An effect is obtained that the expansion-contraction absorber can be installed even in a narrow space.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing an embodiment of an expansion / contraction split method of a multiple-type expansion / contraction absorber according to the present invention by a specific mechanism.

FIG. 2 is an operation explanatory diagram showing a state of expansion and contraction division in the apparatus of FIG. 1;

FIG. 3 is an explanatory view showing a conventional multiple expansion / contraction absorber.

FIG. 4 is an operation explanatory view showing a state of expansion and contraction division in the apparatus of FIG. 3;

[Description of Signs] M Application point 1 Cable support (fixed side) 2 Cable support (movable side) 3, 4 Rod 5 Pantograph 6 Cable support member 7 Cable 51 Projection 61 Slot

Claims (2)

[Claims] An expansion / contraction device for a multiple pneumatic expansion / absorption device, wherein an operation point for dividing the expansion / contraction is provided in the middle of a pantograph arm for dividing the expansion / contraction. . 2. The method according to claim 1, wherein the formation of the action point comprises a combination of a projection provided on the arm of the pantograph and an elongated hole formed in the cable support member.