JPH0613776B2 - Extension structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a stretchable structure capable of stretching.

[Conventional technology]

For example, at least three elastic vertical beams are provided as an extension structure such as an extension mast that is mounted on a spacecraft such as an artificial satellite and used by being extended in outer space, and each vertical beam is elastically deformed into a coil shape. By being reduced by
Some of them extend into columns due to the restoration of each vertical beam.

5 to 7 show an extension structure of this type provided with three elastic longitudinal beams. FIG. 5 is an extension state, FIG. 6 is an extension state, and FIG. The reduced state is shown. To explain the structure of this extension structure, in the figure,
Reference numerals 1 and 2 denote end plates having a disc shape, and 3 denotes three elastic vertical beams having the same length and provided between the end plates 1 and 2. The elastic vertical beams 3 and 3 are made of an elastic wire material such as epoxy resin reinforced with glass fiber or carbon fiber,
The lower ends of the vertical beams 3 and 3 are pivotally attached to brackets 4 and 4 provided on the upper surface of the lower end plate 1 along the outer peripheral edge thereof at equal intervals. The upper ends are pivotally attached to brackets (not shown) provided on the lower surface of the upper end plate 2 along the outer peripheral edge thereof at equal intervals. 5 is the both end plates
It is a horizontal beam which is provided in a plurality of stages at a predetermined pitch and connects the vertical beams 3 and 3 to each other. The horizontal beams 5 and 5 are the vertical beams 3 and 3.
3 are provided at equal intervals over the entire length. The horizontal beams 5 and 5 are made of synthetic resin and are elastically deformable. The tips of the three arms radially extending from the center are fixed to the vertical beams 3 and 3, respectively. Are connected to each other. Further, 6 is an X-shape so as to connect two vertical beams (adjacent vertical beams) 3 and 3 which form a pair between the end plates 1 and 2 and the horizontal beams 5 and 5, and between the horizontal beams 5 and 5, respectively. It is a cable rope stretched over. The oblique ropes 6 and 6 are composed of fiber ropes having high tensile strength, and the oblique ropes 6 and 6 are connected in an X shape by connecting the two opposite angles for each span divided by the cross beams 5 and 5. Is stretched over. On the other hand, 7 is a pulling line for pulling one of the both end plates 1 and 2, for example, the upper end plate 2 toward the other end plate (lower end plate) 1 to reduce the extension structure. It is connected to the center of the upper end plate 2 and is drawn out below the lower substrate 1 through the cable passage holes 8 and 8 provided at the centers of the transverse beams 5 and 5 and the cable passage hole 9 provided at the center of the lower substrate 1. , Is wound around a winding drum (not shown) driven by a motor.

This extension structure is reduced by elastically deforming the elastic vertical beams 3 and 3 into a coil shape. When the pulling rope 7 is wound around the winding drum, the upper end plate 2 is pulled by the pulling rope 7. The vertical beams 3, 3 are elastically deformed from the upper end side into a coil shape as shown in FIG. 6 by the pulling force of the upper end plate 2 (at this time, the coils of the vertical beams 3, 3 are (The upper end plate 2 rotates in the direction of the solid line arrow in accordance with the shape deformation), and finally the coiled deformed vertical beams 3 and 3 are reduced to the state shown in FIG. The horizontal beams 5 and 5 are twisted and flexibly deformed as the vertical beams 3 and 3 are deformed in a coil shape. In addition, this extension structure
It is designed to be extended by reversing the winding drum and loosening the pulling line 7. When the pulling line 7 is loosened, the vertical beams 3 and 3 which are deformed into a coil shape are repulsive force of the vertical beam itself. Then, the structure extends in a columnar shape in the opposite direction to that at the time of contraction (at this time, the upper end plate 2 also restores the vertical beams 3 and 3 in the direction of the chain line arrow shown in FIG. 6). It rises while rotating) and finally extends to the state shown in FIG. Also,
When the structure is fully extended to the state shown in FIG.
A rectangular frame composed of 3 and the lateral beams 5 and 5 forms a braces. The oblique lines 6 and 6 are effective only for the tensile force, but since the oblique lines 6 and 6 are stretched in an X shape, the rectangular frame has a tensile force and a compressive force from the diagonal direction. Since it can be prevented from being deformed by the oblique ropes 6 and 6, the extended structure has rigidity similar to that of the braced rigid frame structure.

By the way, in the case of contracting the extension structure, in order to smoothly contract the structure, it is necessary to successively contract the structure from one end side thereof as shown in FIG. When the vertical beams 3 and 3 are linearly extended over the entire length in the extended state of the object as shown in FIG. 5, the vertical beams 3 and 3 are compressed by the axial force (the upper end plate 2 by the pull line 7). When it cannot withstand the pulling force), the buckling occurs for the first time and the coil is deformed from this part. Therefore, an unreasonable force is applied to the vertical beams 3 and 3. Since it is not possible to specify the buckling start position of C, that is, the position where the coil starts to be deformed into a coil shape, it becomes impossible to reduce the structure well until the longitudinal beams 3 and 3 deform into a coil shape from the vicinity of the central portion in the longitudinal direction, for example. It may happen.

For this reason, conventionally, as shown in FIG. 8, it is considered that the contraction start end side (here, the upper end side) of each of the vertical beams 3 and 3 is curved so that it is easily deformed into a coil shape during contraction. Thus, if the contraction start end sides of the vertical beams 3 and 3 are bent in advance in this way, the contraction start end sides of the respective vertical beams 3 and 3 can be quickly moved when the upper end plate 2 is pulled down by the pull line 7. Since it begins to deform into a coil, the structure can be smoothly reduced from one end side thereof.

[Problems to be solved by the invention]

However, in the extended structure shown in FIG. 8, even when the extended structure is completely extended, the contraction start end side of each of the vertical beams 3 and 3 is bent as shown in the drawing, and thus the extended structure is extended. There is a problem that the contraction start end side of No. 2 becomes twisted, which reduces the strength of this portion and the structure.

The present invention has been made in view of the above situation, and its object is to bend the reduction start end side of the vertical beam so as to be easily deformed into a coil shape as in the conventional case. It is possible to deform each vertical beam from its one end side into a coil shape and reduce the structure smoothly without difficulty, and when the structure is extended, each vertical beam is extended linearly over the entire length. It is to provide an extension structure capable of maintaining high strength.

[Means for solving problems]

According to the present invention, the end plate side rope end of one of the two oblique ropes stretched in an X shape between the one end plate and the transverse beam closest to the end plate is defined as the one end plate. Of the rope is guided by a rope guide means provided near the vertical beam pivot portion, and is folded back to the side of the transverse beam. At the folded end of this oblique rope, a rope for pulling the one end plate toward the other end plate. It is characterized by connecting the ends.

[Action]

That is, the extension structure of the present invention is
Between the end plate and the horizontal beam, the oblique line connected to the pulling line of the oblique lines stretched in an X shape between one end plate and the horizontal beam closest to this end plate is pulled by the pulling line. By shortening the length of the oblique cable, the end plate is pulled and rotated by this oblique cable, and one end side of each vertical beam whose end portion is pivotally attached to this end plate is bent and deformed. , The pulling force of the pulling line is applied to the end plate through the oblique line to reduce the vertical beam while deforming it into a coil shape. Each vertical beam can be deformed into a coil shape from one end side without curving the end side so that it can be easily deformed into a coil shape, and the structure can be smoothly reduced without difficulty. Since it is not necessary to bend the contraction start end side of the vertical beam in the vertical direction, when the structure is extended, It is possible to maintain a high intensity of linearly by stretching the structure over the entire length.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 by taking an extension structure having three vertical beams as an example. The extension structure of this embodiment is contracted from the upper end side, and the configuration other than the upper end is the same as that of the extension structure shown in FIGS. Only the configuration on the upper end side will be described.

In FIGS. 1 and 2, 2 is an upper end plate of the extension structure, 3 is three elastic vertical beams, and both ends of each vertical beam 3, 3 are lower end plates (see FIGS. 5 to 5). 7) and the upper end plate 2
Is pivotally attached to brackets 4 and 4 provided at the outer peripheral edge of the. In addition, 5a is the uppermost horizontal beam that is closest to the upper end plate 2 among the horizontal beams that connect the vertical beams 3 and 3, 6 is an oblique line, and the oblique lines 6 and 6 below the uppermost horizontal beam 5a are It is stretched like a conventional extension structure. Two vertical beams (adjacent vertical beams) paired with the upper end plate 2 and the uppermost horizontal beam 5a.
Of the two oblique ropes 6a, 6b stretched so as to connect the two opposing corners of the rectangular frame constituted by 3 and 3 and serving as the tension braces of the rectangular frame, the oblique rope of FIG. 1 ( Like the conventional extension structure, the oblique line 6a indicated by a chain line is an end plate pivotal attachment portion of one vertical beam 3 of the two vertical beams 3 and 3 of the pair and the other vertical beam 3 thereof. The second diagonal cable 6b is connected and fixed at its upper end to the uppermost horizontal beam connecting portion of the first vertical beam 3 by connecting and fixing both ends to the uppermost horizontal beam connecting portion of the first vertical beam 3. It is stretched so as to intersect the oblique cable 6a in an X shape. The other end of the second oblique cable 6b is movably inserted into a cable guide hole 10 provided in the upper end plate 2 in the vicinity of the pivotal connection portion of the other vertical beam 3 to form an upper surface of the upper end plate 2. Is guided to the rope through hole 11 provided in the central portion of the upper end plate 2 and led out below the upper end plate 2 through the rope through hole 11 to be folded back to the uppermost horizontal beam 5a side. The rope end of the pull cable 7 that pulls the upper end plate 2 toward the lower end plate is connected to the rope end of the second oblique rope 6b. Also, the second
When the structure is completely extended, the oblique rope 6b is received by the upper edge of the rope guide hole 10 as shown in FIG. 1 and is located between the upper end plate 2 and the uppermost horizontal beam 5a. 2 Upper stopper 12 that supports the upper end plate 2 so as not to loosen the oblique cable 6b
And the second oblique cable 6 which is pulled and moved by pulling down the cable 7.
As shown in FIG. 2, when b has moved to some extent, a lower stopper 13 which is received by the lower edge of the rope guide hole 10 and regulates the amount of pulling movement of the second oblique rope 6b is fixed.

This extension structure is similar to the extension structure shown in FIG. 5 to FIG.
Is contracted while deforming into a coil shape, and is stretched in a columnar shape by restoring each of the vertical beams 3 and 3 that are deformed into a coil shape by loosening the towline 7. The contraction of the structure in the expanded state Is performed as follows.

When the tow line 7 is pulled downward when the structure is contracted, first, the second oblique line 6b connected to this tow line 7 is pulled and moved by the tow line 7 toward the end plate center side, and the upper end plate 2 is correspondingly moved. The length of the second oblique rope 6b between the uppermost horizontal beam 5a and the uppermost horizontal beam 5a is shortened.
The vertical beams 3 and 3 each of which is pulled by the second oblique rope 6b between them and rotated in the direction of the arrow shown in FIG. 1, and the upper end of which is pivotally attached to the upper end plate 2 are shown in FIG. As shown in FIG. 3, the end plate 2 is bent and deformed in the rotating direction. In this case, the second oblique line 6b and X
The first oblique lines 6a intersecting each other are stretched in a direction in which the upper end plate 2 is prevented from rotating, but when the upper end plate 2 rotates, the upper end side of the structure is twisted and deformed in the circumferential direction accordingly. Therefore, the rotation of the upper end plate 2 is not hindered by the first oblique rope 6a. When the second oblique cable 6b is pulled to the center side of the substrate to some extent and the lower stopper 13 fixed to the second oblique cable 6b is received by the lower edge of the cable guide hole 10 of the upper end plate 2. , The second oblique rope 6b does not move any further, so that the pulling force of the pulling wire 7 is directly applied to the upper end plate 2 through the portion of the second oblique rope 6b on the end plate 2 and the lower stopper 13. The upper end plate 2 is pulled down by the pulling line 7, but at this time, since the upper ends of the vertical beams 3 and 3 have already been bent, the vertical beams 3 and 3 are pulled down. As the upper end plate 2 is further rotated, the upper end plate 2 is deformed into a coil shape.

Therefore, according to the above-mentioned extension structure, each vertical beam 3, 3 is coiled from its one end side without being bent so that the contraction start end side of the vertical beam is easily deformed into a coil shape as in the prior art. The structure can be deformed smoothly and smoothly, and since it is not necessary to bend the contraction start end side of the vertical beam as in the past, each vertical beam is extended when the structure is extended. The strength of the structure can be kept high by linearly stretching 3, 3 over the entire length. Further, in the above-described embodiment, when the structure is completely extended to the second oblique rope 6b, it is received by the upper edge of the rope guide hole 10 of the upper end plate 2 and the upper end plate 2 and the uppermost horizontal beam 5a are received. Second cableway 6b between
Since the upper stopper 12 for supporting the upper end plate 2 is fixed so as not to loosen, the second oblique cable 6b acts as a tensile strut when the structure is extended as shown in FIG. Become.

In addition, when the upper end plate 2 is rotated by pulling the second oblique rope 6b with the pulling rope 7 like the extension structure, the second oblique rope 6b is rotated.
As the length of is shortened, it is connected to the rectangular frame composed of the upper end plate 2, the uppermost horizontal beam 5a and the pair of two vertical beams 3 and 3 by the first oblique cable 6a shown by the chain line. Although a strain to extend in the diagonal direction is generated, since the length of the first oblique cable 6a is fixed, the uppermost horizontal beam 5a is largely deformed by the pulling force of the first oblique cable 6a. In the above-mentioned extension structure, the uppermost cross beam 5 is configured so that the first oblique rope 6a is extended when a certain tensile force is applied.
It is desirable to reduce the bending deformation of a.

In order to extend the first oblique cable 6a in this way, a spring member that allows the extension of the oblique cable 6a may be provided on the first oblique cable 6a. FIG. 3 shows an example of the spring member. The spring member 14 comprises a rod-shaped or plate-shaped spring member 15 made of an elastic wire material such as epoxy resin reinforced with glass fiber or carbon fiber or an elastic metal. The rope passing rings 15a and 15b are attached to both ends thereof. The first oblique rope 6a is separated into a rope body A connected to the end plate pivoting portion of the vertical beam 3 and a rope body B connected to the uppermost horizontal beam connecting portion of the vertical beam 3. One of the ropes A is connected to the other end of the spring member 15 through the rope passage ring 15a on one end side of the spring member 15, and the other rope B is passed through the rope passage ring 15b on the other end side of the spring member 15. It is connected to one end of the spring member 15. The spring member 15 pulls both cords A and B with a constant spring force in a direction in which they are pulled toward each other.
When the tensile force applied to the first oblique rope 6a is small, the spring member 15 is in an extended state as shown in FIG. 3 (a), and the tensile force applied to the first oblique rope 6a is applied to the uppermost horizontal beam 5a. When it becomes close to a tensile force that causes excessive flexural deformation, it elastically deforms in an arc shape as shown in FIG. 3 (b) to extend the first oblique cable 6a and absorb the excessive tensile force. Then, the bending deformation of the uppermost horizontal beam 5a is alleviated.

The spring member 14 is not limited to the one described above, but a coil spring or a constant force spring 16 as shown in FIG. 4 may be used.

In the above embodiment, the second oblique cable 6b is guided by the cable guide hole 10 provided in the upper end plate 2 in the vicinity of the vertical beam pivot portion and the cable passage hole 11 provided in the center of the upper end plate 2. Although connected to the tow line 7, the second oblique line 6b is provided with a line guide member such as a ring or a roller on the lower surface of the upper end plate 2 near the vertical beam pivot portion, and is guided by the line guide member. Alternatively, the second oblique rope 6b may be folded back, and the pulling rope 7 may be connected to the folded end of the oblique rope 6b. Further, in the above embodiment, the structure which is contracted from the upper end side has been described, but the present invention can be applied to the extended structure which is contracted from the lower end side.
It can also be applied to an extension structure having more than one vertical beam. In the case of an extension structure having a large number of vertical beams, two adjacent vertical beams may be paired and a diagonal cable may be stretched between the two adjacent vertical beams, or at least every other vertical beam. The two vertical beams may be paired and a diagonal cable may be stretched between the vertical beams.

〔The invention's effect〕

In the extension structure of the present invention, the end plate side cable end of one of the two oblique ropes stretched in an X shape between the one end plate and the transverse beam closest to the end plate is defined as above. In order to guide it by the rope guide means provided in the vicinity of the vertical beam pivot portion of one end plate and turn it back to the horizontal beam side, and to pull the one end plate to the other end plate side at the folded end of this diagonal line The rope ends of the towed rope are connected, and at the initial stage of the contraction, the towed rope to which the towed wires are connected is pulled by the tow cable to shorten the length of the oblique rope between the end plate and the transverse beam. By this, the one end plate is pulled and rotated by this oblique line to bend and deform one end side of each vertical beam whose end portion is pivotally attached to this end plate, and then the pulling force of the pull line. Is applied to the end plate through the oblique rope to reduce the vertical beam while deforming it into a coil shape. Each vertical beam can be deformed into a coil shape from one end side without being bent so that it can be easily deformed into a coil shape, and the structure can be smoothly reduced without difficulty. Since it is not necessary to bend the contraction start end side of (1), it is possible to keep the strength of the structure high by extending each vertical beam linearly over the entire length when the structure is extended.

[Brief description of drawings]

FIG. 1 and FIG. 2 are perspective views of the upper end of the extension structure in the extension state and the contraction start state showing one embodiment of the present invention, and FIG. 3 and FIG. FIG. 5, FIG. 6, FIG. 7 and FIG. 7 are perspective views of the spring member provided on the rope, showing the principle structure of the extension structure in the extended state, in the middle of expansion and contraction, and in the contracted state, and FIG. It is a perspective view of the fully extended state of the structure. 2 ... Upper end plate, 3 ... Elastic vertical beam, 5a ... Top horizontal beam, 6a ... First oblique cable, 6b ... Second oblique cable, 7 ... Pulling wire, 10 ... Cable guide hole, 11 ... Cable passage hole, 12 ... Upper stopper, 13 ... Lower stopper.

Claims (1)

[Claims] 1. At least three or more elastic vertical beams having both ends pivotally attached to a pair of upper and lower end plates, and a plurality of elastic vertical beams provided at a predetermined pitch between the both end plates to connect the vertical beams to each other. Cross beam, an oblique cable stretched in an X shape so as to connect two vertical beams forming a pair between the end plate and the horizontal beam and between each horizontal beam, and one of the both end plates to the other end. And a pulling line for pulling to the plate side.By pulling one end plate to the other end plate side by the pulling line, each vertical beam is elastically deformed into a coil shape and reduced, and In an extension structure in which each vertical beam is restored to a straight line by extending the column and extends in a columnar shape, two oblique lines stretched in an X shape between the one end plate and the horizontal beam closest to the end plate. A rope proposal in which one of the ropes and the end plate side rope end are provided near the vertical beam pivot portion of the one end plate. Is guided by means folding the lateral beam side, extended structure, characterized in that the concatenation of the cord ends of the 引索 the folded end of the Hasusaku.