Patent Description:
In a related-art rope on a hoisting machine, which uses reinforcement fibers, a load bearing portion is made of a polymer matrix and the reinforcement fibers. As the reinforcement fibers, carbon fibers or glass fibers are used. Further, the reinforcement fibers are evenly dispersed in the polymer matrix, and are arranged in parallel to a longitudinal direction of the rope (for example, see Patent Literature <NUM>).

The above-mentioned rope using the reinforcement fibers has higher breaking strength per weight than a wire rope formed by twisting steel wires. Accordingly, particularly in a high-rise elevator requiring a long rope, a weight of the entire rope can be reduced, and a burden of driving on the hoisting machine can be reduced. PTL <NUM> discloses a suspension body for an elevator according to the preamble of independent claim <NUM>.

However, the related-art ropes described above are poor in flexibility. Thus, it is difficult to bend a related-art rope along a driving sheave of the hoisting machine. Moreover, the bending may cause increase in internal stress of the rope, and hence there is a risk of causing breakage of the rope. In order to avoid such a breakage of the rope, it is necessary to increase a diameter of the driving sheave.

This invention has been made to solve the above-mentioned problem, and has an object to obtain an elevator capable of reducing stress generated on a load bearing layer of a suspension body when the suspension body is bent, a suspension body for the elevator, and a manufacturing method for such a suspension body.

According to the invention, the problem is solved by the suspension body outlined in independent claim <NUM>. Advantageous further developments of the invention are set forth in the dependent claims. According to the present invention, there is provided a suspension body for an elevator, including: a core including a load bearing layer formed of an impregnation resin and a plurality of high-strength fibers; and a covering layer covering at least a part of an outer periphery of the core, wherein the core is divided into a plurality of core segments arranged apart from each other, wherein the covering layer enters a region between the core segments adjacent to each other, and wherein a density of the high-strength fibers in a center portion of each of the core segments in a thickness direction of each of the core segments is higher than a density of the high-strength fibers in both end portions of each of the core segments in the thickness direction.

According to the elevator, the suspension body for an elevator, and the manufacturing method for the suspension body of this invention, there can be reduced stress generated on the load bearing layer of the suspension body when the suspension body is bent.

Now, the best mode for carrying out the present invention is described referring to the drawings.

<FIG> is a configuration view for illustrating an elevator according to a first example not covered by the claimed invention. In <FIG>, a machine room <NUM> is provided in an upper part of a hoistway <NUM>. A hoisting machine <NUM>, a deflector sheave <NUM>, and an elevator controller <NUM> are installed in the machine room <NUM>. The hoisting machine <NUM> includes a driving sheave <NUM>, a hoisting machine motor (not shown) configured to rotate the driving sheave <NUM>, and a hoisting machine brake (not shown) configured to brake rotation of the driving sheave <NUM>.

A plurality of suspension bodies <NUM> (only one suspension body is illustrated in <FIG>) are wound around the driving sheave <NUM> and the deflector sheave <NUM>. The suspension bodies <NUM> each have a first end portion 7a and a second end portion 7b. The first end portion 7a is connected to a car <NUM> serving as an ascending/descending body. The second end portion 7b is connected to a counterweight <NUM> serving as an ascending/descending body.

The car <NUM> and the counterweight <NUM> are suspended by the suspension bodies <NUM> through use of a <NUM>:<NUM> roping method. Further, the car <NUM> and the counterweight <NUM> are vertically moved in the hoistway <NUM> through rotation of the driving sheave <NUM>. The elevator controller <NUM> is configured to control the hoisting machine <NUM>, to thereby control operation of the car <NUM>.

A pair of car guide rails (not shown) and a pair of counterweight guide rails (not shown) are installed in the hoistway <NUM>. The car guide rails are configured to guide vertical movement of the car <NUM>. The counterweight guide rails are configured to guide vertical movement of the counterweight <NUM>.

The car <NUM> includes a car frame <NUM> and a cage <NUM>. The suspension bodies <NUM> are connected to the car frame <NUM>. The cage <NUM> is supported by the car frame <NUM>.

<FIG> is a sectional view for schematically illustrating a cross section of the suspension body <NUM> in <FIG> perpendicular to a length direction thereof (Z-axis direction in <FIG>). The suspension body <NUM> has such a belt-like shape that a dimension in a thickness direction of the suspension body <NUM> (Y-axis direction in <FIG>) is smaller than a dimension in a width direction of the suspension body <NUM> (X-axis direction in <FIG>). That is, the suspension body <NUM> is a so-called flat belt.

Further, the suspension body <NUM> has a sheave contact surface 7c being any one of end surfaces in the thickness direction. When the suspension body <NUM> is wound around the driving sheave <NUM>, the sheave contact surface 7c is brought into contact with an outer peripheral surface of the driving sheave <NUM>. That is, when passing over the driving sheave <NUM>, the suspension body <NUM> is bent along the outer peripheral surface of the driving sheave <NUM> so that the sheave contact surface 7c is positioned on an inner side of the suspension body <NUM>.

The suspension body <NUM> includes a core <NUM> and a covering layer <NUM>. The core <NUM> has a belt-like shape. The covering layer <NUM> covers an entire periphery of the core <NUM>.

As a material for the covering layer <NUM>, a thermoplastic resin, such as polyethylene, polypropylene, polyamide <NUM> (PA6), polyamide <NUM> (PA12), polyamide <NUM> (PA66), polycarbonate, polyether ether ketone, or polyphenylene sulfide, may be used.

In addition, as a material for the covering layer <NUM>, an olefin-based, styrene-based, vinyl chloride-based, urethane-based, polyester-based, polyamide-based, fluorine-based, or butadiene-based thermoplastic elastomer may also be used.

Further, as a material for the covering layer <NUM>, a thermosetting elastomer (rubber), such as a butadiene rubber, a styrene-butadiene rubber, a chloroprene rubber, an acrylic rubber, a urethane rubber, or a silicone rubber, may also be used.

Further, as a material for the covering layer <NUM>, a carbon fiber, a glass fiber, an aramid fiber, a PBO (poly-p-phenylene benzobisoxazole) fiber, or a basalt fiber may be used. In addition, the material may be a composite material of a fiber and a resin.

It is preferred that a material having high heat resistance and high wear resistance be employed as a material for the covering layer <NUM>. Through change of the material for the covering layer <NUM>, a coefficient of friction between the suspension body <NUM> and the driving sheave <NUM> can be adjusted.

The core <NUM> includes a load bearing layer <NUM> and a plurality of intermediate layers <NUM>. The load bearing layer <NUM> is divided into a plurality of layers in the thickness direction of the core <NUM>, namely, the thickness direction of the suspension body <NUM>. That is, the load bearing layer <NUM> is formed of a plurality of segment layers <NUM> arranged apart from each other in the thickness direction of the core <NUM>.

The intermediate layer <NUM> is made of a material different from materials for the covering layer <NUM> and the load bearing layer <NUM>. Further, the intermediate layer <NUM> is interposed between the segment layers <NUM> adjacent to each other in the thickness direction of the core <NUM>. That is, the segment layers <NUM> and the intermediate layers <NUM> are alternately laminated in the thickness direction of the core <NUM>. In this example, the load bearing layer <NUM> is divided into three segment layers <NUM>. Thus, two intermediate layers <NUM> are used.

Further, the intermediate layer <NUM> may be interposed in an entire region between the segment layers <NUM> adjacent to each other in the thickness direction of the core <NUM>, or may be interposed only in a bent region. With this configuration, the adjacent segment layers <NUM> are not held in direct contact with each other, and the covering layer <NUM> does not enter the region between the adjacent segment layers <NUM>.

The load bearing layer <NUM> is a layer configured to mainly bear a load acting on the suspension body <NUM>. Further, the load bearing layer <NUM> is formed of an impregnation resin and a high-strength fiber group provided in the impregnation resin.

The high-strength fiber group includes a plurality of high-strength fibers arranged along the length direction of the core <NUM> (Z-axis direction in <FIG>). Further, the high-strength fiber group may be a high-strength fiber fabric or a high-strength fiber braid formed of the high-strength fibers arranged along the length direction of the core <NUM>.

The high-strength fiber is a light-weight and high-strength fiber. As the high-strength fiber, for example, a carbon fiber, a glass fiber, an aramid fiber, a PBO (poly-p-phenylene benzobisoxazole) fiber, or a basalt fiber may be used. In addition, as the high-strength fiber, a composite fiber obtained by combining those fibers may be used.

As the impregnation resin of the load bearing layer <NUM>, a thermosetting resin, such as polyurethane, an epoxy, an unsaturated polyester, vinyl ester, phenol, or silicone, may be used.

In addition, as the impregnation resin, a thermoplastic resin, such as polyethylene, polypropylene, polyamide <NUM> (PA6), polyamide <NUM> (PA12), polyamide <NUM> (PA66), polycarbonate, polyether ether ketone, or polyphenylene sulfide, may be used.

Moreover, the impregnation resin may contain a lubricant such as grease or oil. Alternatively, a lubricant such as grease may be used instead of the impregnation resin.

In particular, it is preferred that the impregnation resin be a resin having good adhesiveness with respect to the high-strength fibers. When a resin having a low modulus of elasticity is used as the impregnation resin, flexural rigidity of the suspension body <NUM> can be further reduced. Meanwhile, when a resin having a high modulus of elasticity is used as the impregnation resin, the high-strength fibers are firmly integrated together, thereby being capable of reducing unevenness in strength of the suspension body <NUM>.

Shear rigidity of the intermediate layer <NUM> is lower than shear rigidity of the segment layer <NUM>. As a material for the intermediate layer <NUM>, a thermosetting resin, such as polyurethane, an epoxy, an unsaturated polyester, a vinyl ester, phenol, or silicone, may be used.

In addition, as a material for the intermediate layer <NUM>, a thermoplastic resin, such as polyethylene, polypropylene, polyamide <NUM> (PA6), polyamide <NUM> (PA12), polyamide <NUM> (PA66), polycarbonate, polyether ether ketone, or polyphenylene sulfide, may also be used.

In the suspension body <NUM> for an elevator described above, the load bearing layer <NUM> is divided in the thickness direction of the core <NUM>, and the intermediate layer <NUM> is interposed between the adjacent segment layers <NUM>. Thus, through selection of a material for the intermediate layer <NUM>, bendability of the core <NUM> can be improved. Further, it is possible to relieve stress on the segment layers <NUM>, which are respectively located at an innermost layer and an outermost layer, when the core <NUM> is bent. With this configuration, a diameter of the driving sheave <NUM> can also be reduced.

Further, the shear rigidity of the intermediate layer <NUM> is set lower than the shear rigidity of the segment layer <NUM>. Thus, when the core <NUM> is bent, the intermediate layers <NUM> are easily deformed in a shearing direction (Z-axis direction in <FIG>). With this configuration, it is possible to more reliably relieve the stress on the segment layers <NUM>, which are respectively located at the innermost layer and the outermost layer, when the core <NUM> is bent.

<FIG> is a sectional view for illustrating a bent state of a piece of the suspension body <NUM> having the sectional structure in <FIG>, and illustrating a cross section (YZ cross section) of the suspension body <NUM> taken along the length direction. Further, <FIG> is an enlarged sectional view for illustrating a portion IV in <FIG>. As illustrated in <FIG>, when the suspension body <NUM> is bent, the intermediate layers <NUM> undergo shear deformation in the length direction of the core <NUM>, thereby improving flexibility of the suspension body <NUM>.

The number of the segment layers <NUM> is not limited to three. For example, as illustrated in <FIG>, the number of the segment layers <NUM> may be four. That is, the number of the segment layers <NUM> may be any number equal to or more than two. When the number of the segment layers <NUM> is set to n, the number of the intermediate layers <NUM> is n-<NUM>.

Further, it is desired that a modulus of rigidity of the intermediate layer <NUM> be set lower than a modulus of rigidity of the covering layer <NUM>. With this configuration, the region between the segment layers <NUM> more easily undergoes shear deformation, thereby further improving the flexibility of the suspension body <NUM>. Further, stress generated on the load bearing layer <NUM> when the core <NUM> is bent can be further reduced.

Moreover, in a case in which compression stiffness of a material for the intermediate layer <NUM> is set lower than compression stiffness of a material for the load bearing layer <NUM>, when the suspension body <NUM> passes over the driving sheave <NUM>, the suspension body <NUM> receives a load in a direction of compressing the cross section, and a thickness of the portion having received the compressive load is reduced. As a result, the suspension body <NUM> is easily bent.

Further, the intermediate layer <NUM> may be formed of an elastomer material having a characteristic, that is, a lower elastic modulus than that of the dividing layer <NUM>. As the elastomer material, for example, an olefin-based, styrene-based, vinyl chloride-based, urethane-based, polyester-based, polyamide-based, fluorine-based, or butadiene-based thermoplastic elastomer may be used. In addition, as the elastomer material, a thermosetting elastomer (rubber), such as a butadiene rubber, a styrene-butadiene rubber, a chloroprene rubber, an acrylic rubber, a urethane rubber, or a silicone rubber, may be used.

Further, as a material for the intermediate layer <NUM>, there may be used a polymer gel having intermediate properties between a solid and a liquid.

Moreover, as a material for the intermediate layer <NUM>, there may be used a lubricant such as a liquid lubricant, a semi-solid lubricant, or a solid lubricant. As the liquid lubricant, for example, a lubricating oil is given. An example of the semi-solid lubricant is grease. Examples of the solid lubricant include graphite, tungsten disulfide, molybdenum disulfide, and polytetrafluoroethylene.

Further, the intermediate layer <NUM> may be formed of a low-friction sheet which is not bonded to the load bearing layer <NUM>. As the sheet, for example, an olefin-based sheet, a fluorine-based sheet, a polyester-based sheet, or a polyamide-based sheet may be used.

As a material for the olefin-based sheet, there is given, for example, polyethylene or polypropylene. As a material for the fluorine-based sheet, there is given, for example, polytetrafluoroethylene. As a material for the polyester-based sheet, there is given, for example, polyethylene terephthalate. As a material for the polyamide-based sheet, there is given, for example, polyamide <NUM>.

Further, a plurality of sheets can be arranged in layers. Moreover, the liquid lubricant, the semi-solid lubricant, and the solid lubricant can be used in combination. For example, a configuration in which the liquid lubricant is arranged on a surface of the sheet of the solid lubricant is conceivable. Through use of such a lubricant, shear resistance in the intermediate layer <NUM> can be reduced, thereby improving the flexibility of the suspension body <NUM>.

Moreover, as a material for the intermediate layer <NUM>, there may be used a material that is more flexible and richer in cushioning property in the compressing direction than the material of the segment layer <NUM>. An example of such material includes a polymer foam. Examples of the polymer foam include a polyurethane foam, a polyethylene foam, a polyethylene terephthalate foam, a polypropylene foam, an acrylic foam, a polystyrene foam, a phenol foam, a silicone foam, and an EVA foam.

Through use of the above-mentioned material that is rich in cushioning property in the compressing direction, vibration and a shock during operation of the car <NUM> can be absorbed. Further, when the suspension body <NUM> receives tension, a portion of the suspension body <NUM> held in contact with the driving sheave <NUM> is compressed in the thickness direction, and the thickness of the contact portion is reduced. As a result, the suspension body <NUM> is easily bent and deformed.

Further, the intermediate layer <NUM> may be formed of fibers (hereinafter referred to as "intermediate-layer fibers"). It is preferred that a form of the intermediate-layer fibers in this case be continuous fibers continuous in the length direction of the core <NUM>, but the form of the intermediate-layer fibers may be long fibers or short fibers. When the intermediate-layer fibers are placed in the intermediate layer <NUM>, deformation of the intermediate layer <NUM> in the compressing direction, namely, the thickness direction can be suppressed, thereby being capable of relieving stress concentration caused by bending of the segment layer <NUM> at the time of reception of the compressive load.

Moreover, when the intermediate-layer fibers are placed in the intermediate layer <NUM>, it is preferred that a fiber density or modulus of elasticity of the intermediate-layer fibers, which are arranged in the intermediate layer <NUM> along the length direction of the core <NUM>, be set lower than a fiber density or modulus of elasticity of the high-strength fibers, which are arranged in the load bearing layer <NUM> along the length direction of the core <NUM>.

With this configuration, the flexural rigidity of the intermediate layer <NUM> in the length direction of the core <NUM> can be set lower than that of the load bearing layer <NUM> while suppressing compressive deformation of the intermediate layer <NUM>, thereby improving the flexibility of the suspension body <NUM>.

As a method of reducing a fiber density, for example, there is given a method of reducing a fiber diameter or a method of reducing a content of fibers. As a method of reducing a modulus of elasticity of fibers, for example, there is given a method of using glass fibers, polyester fibers, polyarylate fibers, polyethylene fibers, or aramid fibers as the intermediate-layer fibers when the high-strength fibers in the load bearing layer <NUM> are carbon fibers.

Further, when the intermediate-layer fibers are placed in the intermediate layer <NUM>, the intermediate-layer fibers may include inclined fibers inclined with respect to the length direction of the core <NUM>, for example, inclined at <NUM> degrees. With this configuration, the rigidity against torsion can be improved while reducing the rigidity against bending in the length direction of the core <NUM>.

Moreover, when the intermediate-layer fibers are placed in the intermediate layer <NUM>, the intermediate-layer fibers may include orthogonal fibers arranged along a direction orthogonal to the length direction of the core <NUM>, that is, along the width direction of the suspension body <NUM>. With this configuration, the flexural rigidity in the width direction of the core <NUM> can be improved while reducing the rigidity against bending in the length direction of the core <NUM>.

Moreover, the load bearing layer <NUM> in the first example may be formed of the high-strength fiber group without the impregnation resin. With this configuration, the flexural rigidity can be further reduced.

Further, the covering layer <NUM> may contain the lubricant.

Moreover, a portion including the lubricant and a portion without the lubricant may be provided depending on positions in the length direction for each of the covering layer <NUM>, the load bearing layer <NUM>, and the intermediate layer <NUM>.

Next, <FIG> is a sectional view for illustrating the suspension body <NUM> for an elevator according to a second example not covered by the claimed invention. The core <NUM> in the second example is divided into a plurality of core segments <NUM> arranged apart from each other in the width direction of the suspension body <NUM>. In this example, the core <NUM> is divided into three core segments <NUM>. The covering layer <NUM> enters a region between the core segments <NUM> adjacent to each other in the width direction of the suspension body <NUM>. The other configurations are the same as those of the first example.

In the above-mentioned suspension body <NUM>, the resin of the covering layer <NUM> is interposed between the core segments <NUM>, and hence the suspension body <NUM> is easily bent also in the width direction thereof. Thus, when a surface of the driving sheave <NUM> to be brought into contact with the suspension body <NUM> is curved in the width direction of the suspension body <NUM>, the suspension body <NUM> is easily bent along the driving sheave <NUM>.

The number of segments of the core <NUM> may be any number equal to or more than two.

Further, also in the configuration in which the core <NUM> is divided, the number of the segment layers <NUM> and the configurations of the intermediate layers <NUM> can be modified in a manner similar to that in the first example.

Next, <FIG> is a sectional view for illustrating the suspension body <NUM> for an elevator according to a third example not covered by the claimed invention. The core <NUM> in the third example_does not include the intermediate layer <NUM>, and include only the load bearing layer <NUM>. The load bearing layer <NUM> includes an outermost layer <NUM>, an innermost layer <NUM>, and an intermediate bearing layer <NUM>. The outermost layer <NUM> and the innermost layer <NUM> correspond to a pair of outer bearing layers.

The outermost layer <NUM> is a layer arranged outermost in the core <NUM> in a radial direction of the driving sheave <NUM> when the suspension body <NUM> is bent along the driving sheave <NUM>. The innermost layer <NUM> is a layer arranged innermost in the core <NUM> in the radial direction of the driving sheave <NUM> when the suspension body <NUM> is bent along the driving sheave <NUM>.

The intermediate bearing layer <NUM> is evenly interposed between the outermost layer <NUM> and the innermost layer <NUM> throughout the length direction and the width direction of the core <NUM>. Similarly to the first example, each of the outermost layer <NUM>, the innermost layer <NUM>, and the intermediate bearing layer <NUM> is formed of the impregnation resin and the high-strength fiber group provided in the impregnation resin.

However, in the third example, flexural rigidity of the outermost layer <NUM> and the innermost layer <NUM> is lower than flexural rigidity of the intermediate bearing layer <NUM>. The flexural rigidity of each layer can be adjusted through change of, for example, a density of the high-strength fibers forming the high-strength fiber group, a material for the high-strength fibers, or a material for the impregnation resin.

That is, by setting the density of the high-strength fibers in each of the outermost layer <NUM> and the innermost layer <NUM> lower than the density of the high-strength fibers in the intermediate bearing layer <NUM>, the flexural rigidity of the outermost layer <NUM> and the innermost layer <NUM> can be set lower than the flexural rigidity of the intermediate bearing layer <NUM>.

In the above-mentioned suspension body <NUM>, the flexural rigidity of the outermost layer <NUM> and the innermost layer <NUM>, which are located away from a neutral plane C being a plane free from expansion and contraction when the suspension body <NUM> is bent, is lower than the flexural rigidity of the intermediate bearing layer <NUM>, and hence the flexibility in the length direction of the core <NUM> is improved. With this configuration, when the suspension body <NUM> is bent, stress generated on the load bearing layer <NUM> can be reduced.

Next, <FIG> is a sectional view for illustrating the suspension body <NUM> for an elevator according to a fourth example not covered by the claimed invention. In the fourth_ example, the same intermediate layer <NUM> as that in the first example_is interposed between the outermost layer <NUM> and the intermediate bearing layer <NUM> and between the innermost layer <NUM> and the intermediate bearing layer <NUM>. That is, the outermost layer <NUM>, the innermost layer <NUM>, and the intermediate bearing layer <NUM> can be considered as the segment layers <NUM> in the first example, respectively.

In the above-mentioned suspension body <NUM>, as described in the first example, the intermediate layers <NUM> are easily deformed in the shearing direction, thereby further improving the flexibility in the length direction of the core <NUM>. In particular, through use of the intermediate layers <NUM> made of a material having low shear rigidity, when the suspension body <NUM> is bent, stress generated on the load bearing layer <NUM> can be further relieved.

Next, <FIG> is a sectional view for illustrating the suspension body <NUM> for an elevator according to a fifth example not covered by the claimed invention. In the fifth_ example, similarly to the fourth example, the load bearing layer <NUM> is formed of a plurality of layers divided in the thickness direction of the core, that is, the outermost layer <NUM>, the innermost layer <NUM>, and the intermediate bearing layer <NUM>. However, the flexural rigidity of the outermost layer <NUM> and the flexural rigidity of the innermost layer <NUM> are different from each other.

In the fifth example, the flexural rigidity of the outermost layer <NUM> is lower than the flexural rigidity of the other layers forming the load bearing layer <NUM>, that is, the flexural rigidity of the innermost layer <NUM> and the intermediate bearing layer <NUM>. The flexural rigidity of the innermost layer <NUM> is lower than the flexural rigidity of the intermediate bearing layer <NUM>, or equal to the flexural rigidity of the intermediate bearing layer <NUM>.

As a method of making a difference in rigidity between the outermost layer <NUM> and the innermost layer <NUM>, the following method is given. For example, by setting the density of the high-strength fibers in the outermost layer <NUM> lower than the density of the high-strength fibers in each of the innermost layer <NUM> and the intermediate bearing layer <NUM>, the flexural rigidity of the outermost layer <NUM> can be set lower than the flexural rigidity of the innermost layer <NUM> and the intermediate bearing layer <NUM>.

In the above-mentioned suspension body <NUM>, when the suspension body <NUM> is wound around the driving sheave <NUM>, stress generated on the outermost layer <NUM> can be reduced. Further, there is a difference in rigidity between one side and another side of the core <NUM> in the thickness direction, and hence the suspension body <NUM> is easily bent when being wound around the driving sheave <NUM>. Moreover, when the suspension body <NUM> receives the compressive load in the length direction from, for example, the hoisting machine brake, the suspension body <NUM> can be easily bent in one direction.

Next, <FIG> is a sectional view for illustrating the suspension body <NUM> for an elevator according to a sixth example not covered by the claimed invention. In the sixth example, the core <NUM> includes only the load bearing layer <NUM>. The cross section of the load bearing layer <NUM> perpendicular to the length direction of the core <NUM> is formed by a combination of a first region 23a and a plurality of second regions 23b.

The fiber density of the high-strength fibers in each of the second regions 23b is lower than the fiber density of the high-strength fibers in the first region 23a.

The first region 23a and the second regions 23b are combined so that a value of E×W, which is a product of a modulus of elasticity E and a width W of the load bearing layer <NUM> in each end of the core <NUM> in the thickness direction, is smaller than a value of E×W, which is a product of the modulus of elasticity E and the width W of the load bearing layer <NUM> in the neutral plane C of the core <NUM>.

In <FIG>, the load bearing layer <NUM> has a rectangular cross section having constant width dimensions. In the cross section perpendicular to the length direction of the core <NUM>, a width dimension of the first region 23a decreases continuously and gradually from the neutral plane C toward both ends of the core <NUM> in the thickness direction.

With this configuration, the first region 23a becomes continuously and gradually narrower from the neutral plane C in the thickness direction of the core, and the second regions 23b become continuously and gradually wider. The other configurations are the same as those of the first example.

In the above-mentioned suspension body <NUM>, a portion of the core <NUM> on the front surface side, which is distant from the neutral plane C, has low flexural rigidity, and hence flexibility in the length direction of the core <NUM> is improved.

<FIG> is a sectional view for illustrating a first modification example of the sixth example. In the first modification example, in the cross section perpendicular to the length direction of the core <NUM>, recessed portions are formed in widthwise centers of both end surfaces of the load bearing layer <NUM> in the thickness direction of the core <NUM>. Insides of the recessed portions correspond to the second regions 23b, and the remaining portion corresponds to the first region 23a.

<FIG> is a sectional view for illustrating a second modification example of the sixth example. In the second modification example, an entire intermediate portion of the load bearing layer <NUM> in the thickness direction of the core <NUM> corresponds to the first region 23a. Both end portions of the load bearing layer <NUM> in the thickness direction of the core <NUM> correspond to the second regions 23b.

<FIG> is a sectional view for illustrating a third modification example of the sixth example. In the third modification example, the load bearing layer inside the core <NUM> corresponds to the first region 23a, and the second region 23b is formed so as to cover the first region 23a.

Further, the region 23b may have a configuration without the high-strength fibers. The region 23b may be made of, for example, a thermoplastic resin, a thermosetting resin, or an elastomeric material, or may be formed of a lubricant prevented from adhering to the first region 23a or a sheet having a low frictional property. Further, a plurality of sheets can be arranged in layers, and a liquid lubricant, a semi-solid lubricant, and a solid lubricant may be used in combination. For example, a configuration in which the liquid lubricant is arranged on a surface of the sheet of the solid lubricant is conceivable. With this configuration, the flexural rigidity of the suspension body <NUM> can be further reduced.

Even with the configurations illustrated in <FIG>, the value of E×W of the load bearing layer <NUM> at each end of the core <NUM> in the thickness direction is smaller than the value of E×W of the load bearing layer <NUM> at the neutral plane C of the core <NUM>.

In the sixth example, the fiber density of the second region 23b is set lower than the fiber density of the first region 23a, but the modulus of elasticity of the second region 23b in the length direction may be set lower than the modulus of elasticity of the first region 23a in the length direction.

Next, <FIG> is a sectional view for illustrating the suspension body <NUM> for an elevator according to a seventh example not covered by the claimed invention. In the seventh example, the core <NUM> includes only the load bearing layer <NUM>. The load bearing layer <NUM> includes the outermost layer <NUM>, the innermost layer <NUM>, and the intermediate bearing layer <NUM>.

The fiber density of the high-strength fibers in the outermost layer <NUM> is lower than the fiber density of the high-strength fibers in the innermost layer <NUM>. With this configuration, the values of E×W of the load bearing layer <NUM> at both ends of the core <NUM> in the thickness direction are different from each other.

Specifically, a value of E×B of the load bearing layer <NUM> at an end surface on a radially outer side of the driving sheave <NUM> when the suspension body <NUM> is bent along the driving sheave <NUM> is smaller than a value of E×B of the load bearing layer <NUM> at an end surface on a radially inner side thereof. Therefore, in the cross section perpendicular to the length direction of the core <NUM>, the flexural rigidity per unit thickness of the load bearing layer <NUM> at the end portion on the radially outer side of the driving sheave <NUM> is lower than the flexural rigidity per unit thickness of the load bearing layer <NUM> at the end portion on the radially inner side thereof. The other configurations are the same as those of the sixth example.

In the above-mentioned suspension body <NUM>, when the suspension body <NUM> is bent along the driving sheave <NUM>, compressive stress generated on the core <NUM> can be reduced.

Moreover, there is a difference in rigidity between one side and another side of the core <NUM> in the thickness direction. Thus, when the suspension body <NUM> receives the compressive load in the length direction from, for example, the hoisting machine brake, the suspension body <NUM> can be easily bent in one direction.

In the seventh example, the fiber density of the outermost layer <NUM> is set lower than the fiber density of the innermost layer <NUM>, but the modulus of elasticity of the outermost layer <NUM> may be set lower than the modulus of elasticity of the innermost layer <NUM>.

Next, <FIG> is a side view for illustrating a state in which the suspension body <NUM> according to an eighth example is wound around the driving sheave <NUM>. The suspension body <NUM> according to the eighth example is characterized in that an internal adhesion state differs depending on a position thereof in the length direction of the suspension body <NUM>. That is, the suspension body <NUM> includes a plurality of adhesion portions 7e and a plurality of non-adhesion portions 7f.

<FIG> is a sectional view for illustrating the non-adhesion portion 7f, and <FIG> is a sectional view for illustrating the adhesion portion 7e. In <FIG>, the non-adhesion portion 7f includes, in addition to a core 21a including three load bearing layers <NUM> and two intermediate layers 24a, a core covering layer 22c interposed between the core 21a and the covering layer <NUM>.

Particularly in this example, the intermediate layers 24a and the core covering layer 22c are each formed of the lubricant, and hence slipping easily occurs in a region between adjacent layers. The intermediate layers 24a and the core covering layer 22c may be each made of, for example, a thermoplastic resin, a thermosetting resin, or an elastomeric material, or may be formed of a lubricant prevented from adhering to the load bearing layer <NUM> or a sheet having a low frictional property. Further, a plurality of sheets can be arranged in layers, and a liquid lubricant, a semi-solid lubricant, and a solid lubricant may be used in combination. For example, a configuration in which the liquid lubricant is arranged on a surface of the sheet of the solid lubricant is conceivable.

Meanwhile, in <FIG>, the adhesion portion 7e includes, in addition to a core 21b including three load bearing layers <NUM> and two intermediate layers 24b, a core covering layer 22b interposed between the core 21b and the covering layer <NUM>.

The intermediate layers 24b and the core covering layer 22b are each made of a solid material that bonds interlayer regions. The solid material may be the same material as that for the load bearing layer <NUM> or the covering layer <NUM>, or may be a different material.

In this configuration, owing to the adhesion portions 7e, the entire suspension body <NUM> can have the hard and integrated structure, and at the same time, shifting between the load bearing layers <NUM> can be allowed at portions bent along the driving sheave <NUM>. Thus, readiness of bending can be achieved.

<FIG> is a sectional view for illustrating the non-adhesion portion 7f in a modification example of the eighth example. In this example, the core covering layers 22b are provided on both surfaces of the core 21a in the thickness direction, respectively, and the core covering layers 22c are provided on both surfaces of the core 21a in the width direction, respectively. That is, upper and lower surfaces of the core 21a are bonded, and both side surfaces of the core 21a are not bonded.

In this structure, no slipping occurs between the covering layer <NUM> and the load bearing layer <NUM>. Thus, while further maintaining an external shape, shifting between the load bearing layers <NUM> is allowed at portions bent along the driving sheave <NUM>, thereby being capable of achieving readiness of bending.

The neutral plane C, which is a plane prevented from expanding and contracting when the suspension body <NUM> is bent, is located at the center of the core <NUM> in the thickness direction as illustrated in <FIG>, <FIG>, and <FIG>. With this configuration, a behavior of the suspension body <NUM> when tension acts on the suspension body <NUM> can be stabilized.

Moreover, as described in some of the above-mentioned examples, when the difference in rigidity is set between one end and another end of the core <NUM> in the thickness direction, it is suitable to wind the suspension body <NUM> around the driving sheave <NUM> in a direction in which the suspension body <NUM> is easily bent when the suspension body <NUM> is bent along the outer peripheral surface of the driving sheave <NUM>. In this manner, workability when the suspension body <NUM> is wound around the driving sheave <NUM> can be improved.

Further, the configuration of the elevator, to which the suspension body <NUM> according to the examples described above is applied, is not limited to the configuration illustrated in <FIG>. For example, the suspension body <NUM> is applicable also to a machine room-less elevator, an elevator using a <NUM>:<NUM> roping method, a double-deck elevator, and a multi-car elevator. The multi-car elevator is an elevator using a system in which an upper car and a lower car arranged directly below the upper car are vertically moved in the common hoistway independently.

<FIG> is a schematic configuration view for illustrating a manufacturing apparatus for the suspension body <NUM> according to the ninth example, which is an apparatus configured to form the covering layer <NUM>. The manufacturing apparatus includes a sheet arranging unit <NUM> and a pressure forming device <NUM>. In the sheet arranging unit <NUM>, a plurality of thermoplastic sheets <NUM>, which form the covering layer <NUM> and are made of a thermoplastic resin, are arranged so as to surround the core <NUM>.

After that, the core <NUM> and the thermoplastic sheets <NUM> are transferred to the pressure forming device <NUM> and are subjected to pressure forming. In <FIG>, a double belt press is illustrated as the pressure forming device <NUM>, but the pressure forming device <NUM> is not limited thereto. As long as pressure required for integration of the thermoplastic sheets <NUM> and the core <NUM> can be applied continuously or intermittently, for example, an intermittent press or a laminator may be employed.

<FIG> is a sectional view for illustrating a state in which the pressure forming device <NUM> in <FIG> applies pressure to the core <NUM> and the thermoplastic sheets <NUM>, and illustrating the cross section perpendicular to the length direction of the core <NUM>. The thermoplastic sheets <NUM> are arranged on both sides of the core <NUM> in the thickness direction (up-and-down direction in <FIG>) and on both sides of the core <NUM> in the width direction (right-and-left direction in <FIG>).

The pressure forming device <NUM> includes a pair of forming dies 63a and 63b configured to sandwich the core <NUM> and the thermoplastic sheets <NUM> from the both sides of the core <NUM> in the thickness direction. The forming dies 63a and 63b apply pressure in directions indicated by the arrows in <FIG>.

<FIG> is a sectional view for illustrating the suspension body <NUM>, which has not been completed, subjected to pressure forming by the pressure forming device <NUM> in <FIG>. After the suspension body <NUM> passes through the pressure forming device <NUM>, the covering layer <NUM> protrudes to the both sides of the suspension body <NUM> in the width direction more than necessary. Thus, the unnecessary portions are trimmed along the broken lines in <FIG>. In this manner, the suspension body <NUM> is completed.

According to this manufacturing method, the suspension body <NUM>, in which the load bearing layer <NUM> is divided in the thickness direction of the core <NUM> and the intermediate layer <NUM> is interposed between the adjacent segment layers <NUM>, can be easily manufactured. With this method, bendability of the core <NUM> can be improved, thereby being capable of relieving stress concentration on the segment layers <NUM>, which are respectively located at the innermost layer and the outermost layer.

Next, <FIG> is a schematic configuration view for illustrating a part of a manufacturing apparatus for the suspension body <NUM> according to a tenth example not covered by the claimed invention. The manufacturing apparatus in <FIG> corresponds to the manufacturing apparatus in the ninth example, but is different from the manufacturing apparatus in the ninth examplein that a heating device <NUM> is arranged between the sheet arranging unit <NUM> and the pressure forming device <NUM>.

As the heating device <NUM>, there is used a device capable of achieving rapid heating within a certain period of time, such as an ultrasonic heating device, a radical heater, or a far-infrared heater.

In the manufacturing method according to the tenth example, after the thermoplastic sheets <NUM> are arranged around the core <NUM>, the thermoplastic sheets <NUM> are preheated by the heating device <NUM>, and then the core <NUM> and the thermoplastic sheets <NUM> are subjected to pressure forming. The other processes of the manufacturing method are the same as those of the ninth example.

In this manufacturing method, prior to a pressure forming step, the thermoplastic sheets <NUM> are softened, thereby being capable of improving formability.

Next, <FIG> is a sectional view for illustrating a state during manufacture of the suspension body <NUM> by the manufacturing method according to an eleventh example not covered by the claimed invention, and illustrating a cross section corresponding to the cross section in <FIG> in the ninth example. In the manufacturing method according to the eleventh example, as a material for the segment layers <NUM>, a unidirectional FRP plate <NUM> is used. As a material for the unidirectional FRP plate <NUM>, thermosetting resin and the plurality of high-strength fibers described in the first example are used.

Further, as a material for the intermediate layers <NUM>, there are used a plurality of intermediate-layer thermoplastic sheets <NUM> each made of a thermoplastic resin or thermoplastic elastomer described in the first example. Moreover, as a material for the covering layers <NUM>, there are used a plurality of covering-layer thermoplastic sheets <NUM> each made of a thermoplastic resin described in the first example.

Each unidirectional FRP plate <NUM> is manufactured through pultrusion molding. As illustrated in <FIG>, the unidirectional FRP plates <NUM> and at least one intermediate-layer thermoplastic sheet <NUM> are alternately laminated to form a laminated body <NUM>.

After that, the covering-layer thermoplastic sheets <NUM> are arranged so as to surround the laminated body <NUM>, and the laminated body <NUM> and the covering-layer thermoplastic sheets <NUM> are subjected to pressure forming. In this manner, the laminated body <NUM> is integrated to form the core <NUM>, and the covering-layer thermoplastic sheets <NUM> are integrated to form the covering layer <NUM>. Then, as illustrated in <FIG>, the unnecessary portions of the covering layer <NUM> are trimmed. In this manner, the suspension body <NUM> is completed. The other processes of the manufacturing method are the same as those of the ninth example.

Further, when the unidirectional FRP plate <NUM> is formed in advance so that a thermosetting resin is cured, shifting of the high-strength fiber layers in the segment layers <NUM> can be prevented. Moreover, through use of the intermediate-layer thermoplastic sheet <NUM> having elasticity lower than that of the low-elasticity fiber layer <NUM> in the ninth example, an effect of shear deformation of the intermediate layer <NUM> can be improved.

Next, <FIG> is a sectional view for illustrating the suspension body for an elevator according to a twelfth example not covered by the claimed invention. <FIG> is an enlarged sectional view for illustrating a portion 101a in <FIG>. <FIG> is an enlarged sectional view for illustrating a portion 101b in <FIG>. The portion 101a in <FIG> is located at the center portion of the load bearing layer <NUM> in the thickness direction. Further, the portion 101b in <FIG> is located at the end portion of the load bearing layer <NUM> in the thickness direction.

The core <NUM> in the twelfth example includes only the load bearing layer <NUM>. The load bearing layer <NUM> is formed of an impregnation resin <NUM> and a plurality of high-strength fibers <NUM>. Further, a density of the high-strength fibers <NUM> in the center portion of the load bearing layer <NUM> in the thickness direction is higher than a density of the high-strength fibers <NUM> in each end portion of the load bearing layer <NUM> in the thickness direction.

In all of the examples and embodiments, the density of the high-strength fibers <NUM> means a ratio of the high-strength fibers forming the load bearing layer <NUM>. That is, a volume content of the high-strength fibers <NUM> forming a fixed amount of the load bearing layer <NUM>, or a ratio of a sectional area of the high-strength fibers <NUM> occupying the cross section perpendicular to the length direction of the core <NUM> corresponds to the density of the high-strength fibers <NUM>.

In the twelfth example, the density of the high-strength fibers <NUM> decreases continuously from the center portion of the load bearing layer <NUM> in the thickness direction toward both end portions of the load bearing layer <NUM> in the thickness direction. Further, in the twelfth example, through variation of the number of the high-strength fibers <NUM> occupying the sectional area perpendicular to the length direction of the core <NUM>, the density of the high-strength fibers <NUM> is varied. The other configurations are the same as those of the fifth example.

Here, tensile rigidity of the high-strength fibers <NUM> in the Z-axis direction is higher than tensile rigidity of the impregnation resin <NUM> in the Z-axis direction. This is because, in the entire FRP, the high-strength fibers <NUM> mainly have a function of increasing strength and rigidity, and the impregnation resin <NUM> mainly has a function of integrating the high-strength fibers <NUM>.

The load bearing layer <NUM> in this example is characterized in that tensile rigidity in the Z-axis direction is high at the center portion in the Y-axis direction, and that the tensile rigidity decreases at a portion farther from the center portion in the Y-axis direction. Thus, when the cross section of the load bearing layer <NUM> is the same shape and a content of the high-strength fibers <NUM> is the same, a sectional secondary moment in bending with respect to the X-axis, namely, bending about the X-axis becomes lower as compared to a case in which the high-strength fibers <NUM> are evenly dispersed in the impregnation resin <NUM>.

With this configuration, the suspension body is easily bent with respect to the X-axis, and a winding start portion and a winding end portion of the suspension body wound around the driving sheave <NUM> are less liable to loosen up. Thus, the suspension body is less liable to slip off the driving sheave <NUM> when the suspension body is transferred by the driving sheave <NUM>.

Further, it is desired that, in the load bearing layer <NUM> in the twelfth example, the center portion of the load bearing layer <NUM> in the thickness direction be located close to a position on the neutral axis at which the suspension body is not subjected to compression and tension under a state in which the suspension body is wound around the driving sheave <NUM>. Thus, the tension acts on the suspension body in a state of being applied to the elevator, and hence it is desired that the center portion of the load bearing layer <NUM> be located on a side closer to a contact surface with the driving sheave <NUM> than to the center portion of the suspension body in the thickness direction.

Further, the contact surface of the suspension body with the driving sheave <NUM> can be increased, thereby being capable of increasing a transmittable drive force owing to a frictional force acting on the contact surface. Further, the suspension body is easily bent, and hence is easily handled during work such as storage, transport, installation, or replacement.

Here, the Young's modulus of the impregnation resin <NUM> affects readiness of bending of the entire load bearing layer <NUM>. That is, when the Young's modulus of the impregnation resin <NUM> is set low, the readiness of bending is improved. Ideally, it is preferred that the Young's modulus of the impregnation resin <NUM> be set equal to or lower than <NUM> GPa.

Meanwhile, when bending with respect to the X-axis is caused to act on the load bearing layer <NUM>, the high-strength fibers <NUM> are partially subjected to tension in the Z-axis direction, and are partially subjected to compression in the Z-axis direction. In contrast, when the Young's modulus of the impregnation resin <NUM> is set excessively low, the high-strength fibers <NUM> are easily moved in a direction perpendicular to the Z-axis direction in a case in which the high-strength fibers <NUM> are compressed.

Then, separation occurs between the high-strength fibers <NUM> and the impregnation resin <NUM>, with the result that a phenomenon of breakage of the load bearing layer <NUM> is liable to occur. Thus, it is desired that the Young's modulus of the impregnation resin <NUM> be set equal to or higher than <NUM> GPa.

As described above, it is preferred that the Young's modulus of the impregnation resin <NUM> be set equal to or lower than <NUM> GPa and equal to or higher than <NUM> GPa. In particular, as characteristics capable of properly balancing readiness of bending and unbreakableness, it is preferred to select the impregnation resin <NUM> having the Young's modulus of equal to or lower than <NUM> GPa, more preferably, the Young's modulus of equal to or lower than <NUM> GPa. This holds true for all other examples and embodiments relating to the suspension body using the impregnation resin <NUM>.

Further, it is preferred that, in a portion of the load bearing layer <NUM> having the highest density of the high-strength fibers <NUM>, namely, the center portion of the load bearing layer <NUM> in the thickness direction, a volume content of the high-strength fibers <NUM> be set equal to or larger than <NUM> %, more preferably, equal to or larger than <NUM> %.

Further, it is preferred that, in a portion of the load bearing layer <NUM> having the lowest density of the high-strength fibers <NUM>, namely, each end portion of the load bearing layer <NUM> in the thickness direction, the volume content of the high-strength fibers <NUM> be set equal to or lower than <NUM> %, more preferably, equal to or lower than <NUM> %.

This is because, when the density of the high-strength fibers <NUM> is excessively high, the effect of integrating the high-strength fibers <NUM> by the impregnation resin <NUM> is reduced, with the result that fatigue due to bending is liable to progress. The center portion in the thickness direction, which is subjected to low stress when the core <NUM> is bent in a longitudinal direction thereof, is formed to have a high carbon fiber density enabling impregnation in manufacture. Meanwhile, the end portion, which is subjected to a large change in stress due to bending, is formed to have a carbon fiber density capable of sufficiently attaining the integrating effect. Thus, optimization of fatigue and strength can be achieved.

<FIG> is a schematic configuration view for illustrating a manufacturing apparatus for the suspension body according to this example. <FIG> is a sectional view for illustrating a main part of <FIG>. In the apparatus in <FIG>, a first high-strength fiber group <NUM> and a plurality of second high-strength fiber groups <NUM> are paid out from corresponding bobbins, respectively. A fiber density of the first high-strength fiber group <NUM> is higher than a fiber density of the second high-strength fiber groups <NUM>.

In <FIG>, for ease of description, the two kinds of high-strength fiber groups <NUM> and <NUM> are illustrated. However, more bobbins may be arranged, and three or more kinds of high-strength fiber groups different in fiber density may be paid out. In this manner, the density of the high-strength fibers <NUM> can be continuously varied.

The high-strength fiber groups <NUM> and <NUM> paid out from the bobbins are caused to pass through a fiber positioning unit <NUM>. As illustrated in <FIG>, the fiber positioning unit <NUM> has a plurality of holes 110b configured to allow individual passage of the high-strength fiber groups <NUM> and <NUM>. A guide wall 110a configured to guide the high-strength fiber group <NUM> individually is formed around each of the holes 110b.

The high-strength fiber groups <NUM> and <NUM> are caused to pass through the fiber positioning unit <NUM>, and thus are brought close to each other while maintaining mutual relative positions. Further, the high-strength fiber groups <NUM> and <NUM> are caused to pass through an injection device <NUM> after passing through the fiber positioning unit <NUM>.

In the injection device <NUM>, the impregnation resin <NUM> is impregnated into a bundle of the high-strength fiber groups <NUM> and <NUM>. The other configurations of the manufacturing apparatus and the other processes of the manufacturing method are the same as those of the ninth example.

As described above, the manufacturing method for the suspension body according to the twelfth example includes first to fifth steps. The first step is a step of paying out the plurality of high-strength fiber groups <NUM> and <NUM> different in fiber density from the corresponding bobbins, respectively. The second step is a step of forming the bundle of the high-strength fiber groups <NUM> and <NUM> by bringing the high-strength fiber groups <NUM> and <NUM> close to each other while maintaining the mutual relative positions.

The third step is a step of impregnating the impregnation resin <NUM> into the bundle of the high-strength fiber groups <NUM> and <NUM>. The fourth step is a step of forming the core <NUM> by performing hot forming on the bundle of the high-strength fiber groups <NUM> and <NUM> impregnated with a resin. The fifth step is a step of forming the covering layer <NUM> covering at least a part of the outer periphery of the core <NUM>.

With this manufacturing method, the suspension body having the sectional structure as illustrated in <FIG> can be efficiently manufactured.

Next, <FIG> is an enlarged sectional view for illustrating the center portion of the load bearing layer <NUM> in the thickness direction according to a thirteenth example not covered by the claimed invention. <FIG> is an enlarged sectional view for illustrating the end portion of the load bearing layer <NUM> in the thickness direction according to the thirteenth example. <FIG> is an illustration of a portion corresponding to the portion 101a in <FIG>. <FIG> is an illustration of a portion corresponding to the portion 101b in <FIG>.

In the thirteenth example, a plurality of kinds of high-strength fibers <NUM> having different diameters are used. That is, as the high-strength fibers <NUM>, a plurality of first high-strength fibers 102a and a plurality of second high-strength fibers 102b are used. A diameter of the second high-strength fibers 102b is larger than a diameter of the first high-strength fibers 102a. A material for the second high-strength fibers 102b is the same as a material for the first high-strength fibers 102a.

In the center portion of the load bearing layer <NUM> in the thickness direction, the first high-strength fibers 102a are arranged among the second high-strength fibers 102b. In contrast, in each end portion of the load bearing layer <NUM> in the thickness direction, no first high-strength fibers 102a are arranged among the second high-strength fibers 102b, or the number of the first high-strength fibers 102a arranged among the second high-strength fibers 102b is reduced.

With this configuration, the density of the high-strength fibers <NUM> in the center portion of the load bearing layer <NUM> in the thickness direction is higher than the density of the high-strength fibers <NUM> in each end portion of the load bearing layer <NUM> in the thickness direction.

Further, through continuous variation of the number of the first high-strength fibers 102a along the thickness direction of the load bearing layer <NUM>, the density of the high-strength fibers <NUM> can be decreased continuously from the center portion of the load bearing layer <NUM> in the thickness direction toward each end portion of the load bearing layer <NUM> in the thickness direction. The other configurations are the same as those of the twelfth example.

Further, when the load bearing layer <NUM> in the thirteenth example is manufactured, it is only required that the density of the first high-strength fibers 102a in the high-strength fiber groups <NUM> paid out from the upper and lower bobbins in <FIG> be set low, and that the density of the first high-strength fibers 102a in the high-strength fiber group <NUM> paid out from the center bobbin be set high.

Even with this configuration, the same effects as those of the twelfth example can be attained. Further, the high-strength fibers 102a and 102b having different sizes are used, and hence gathering of the high-strength fibers 102a and 102b is less liable to occur at the time of resin impregnation. Thus, a target density distribution can be achieved with better accuracy.

Next, <FIG> is a sectional view for illustrating the suspension body for an elevator according to a fourteenth example not covered by the claimed invention. <FIG> is an enlarged sectional view for illustrating a portion 101c in <FIG>. <FIG> is an enlarged sectional view for illustrating a portion 101d in <FIG>. The portion 101c in <FIG> is located at the first end portion of the load bearing layer <NUM> in the thickness direction. Further, the portion 101d in <FIG> is located at the second end portion of the load bearing layer <NUM> in the thickness direction.

In the fourteenth example, the density of the high-strength fibers <NUM> in the first end portion of the load bearing layer <NUM> in the thickness direction is higher than the density of the high-strength fibers <NUM> in the second end portion of the load bearing layer <NUM> in the thickness direction. Further, the density of the high-strength fibers <NUM> decreases continuously from the first end portion toward the second end portion of the load bearing layer <NUM> in the thickness direction.

Further, it is preferred that, in a portion of the load bearing layer <NUM> having the highest density of the high-strength fibers <NUM>, namely, the first end portion of the load bearing layer <NUM> in the thickness direction, the volume content of the high-strength fibers <NUM> be set equal to or larger than <NUM> %, more preferably, equal to or larger than <NUM> %.

Further, it is preferred that, in a portion of the load bearing layer <NUM> having the lowest density of the high-strength fibers <NUM>, namely, the second end portion of the load bearing layer <NUM> in the thickness direction, the volume content of the high-strength fibers <NUM> be set equal to or smaller than <NUM> %, more preferably, equal to or smaller than <NUM> %. The other configurations and the other processes of the manufacturing method are the same as those of the twelfth example.

With regard to this suspension body, the neutral plane in the cross section under bending can be shifted, thereby being capable of improving readiness of bending.

In order to vary the density of the high-strength fibers <NUM> as described in the fourteenth example, the same method as that of the thirteenth example may be applied.

Next, <FIG> is a sectional view for illustrating the suspension body for an elevator according to a fifteenth example not covered by the claims. <FIG> is an enlarged sectional view for illustrating a portion 101e in <FIG>. The portion 101e in <FIG> is located at the end portion of the load bearing layer <NUM> in the thickness direction.

In the fifteenth example, the density of the high-strength fibers <NUM> in the center portion of the load bearing layer <NUM> in the thickness direction is higher than the density of the high-strength fibers <NUM> in each end portion of the load bearing layer <NUM> in the thickness direction. Further, a layer including only the impregnation resin <NUM> is formed in each end portion of the load bearing layer <NUM> in the thickness direction. The other configurations and the other processes of the manufacturing method are the same as those of the twelfth example or the thirteenth example.

Even with this configuration of the suspension body, bendability can be improved. Further, the layer including only the impregnation resin <NUM> is present on the surface of the load bearing layer <NUM>, thereby being capable of improving adhesiveness with respect to the covering layer <NUM>. With this configuration, occurrence of separation between the load bearing layer <NUM> and the covering layer <NUM> due to bending can be suppressed.

The layer including only the impregnation resin <NUM> in the fifteenth example may be formed in the second end portion in the fourteenth example.

Further, in a portion other than the layer including only the impregnation resin <NUM>, the density of the high-strength fibers <NUM> may be uniform in the thickness direction of the load bearing layer <NUM>.

Next, <FIG> is a sectional view for illustrating the suspension body for an elevator according to a sixteenth example not covered by the claimed invention. In the sixteenth example, the width dimension of the covering layer <NUM> is smaller than the width dimension of the load bearing layer <NUM>. That is, the covering layer <NUM> covers only both surfaces of the load bearing layer <NUM> in the thickness direction, but does not cover both end surfaces of the load bearing layer <NUM> in the width direction.

With this configuration, both end portions of the core <NUM> in the width direction, namely, both end portions of the load bearing layer <NUM> in the width direction protrude from the covering layer <NUM> to the outside, and are exposed from the covering layer <NUM> to the outside. The other configurations and the other processes of the manufacturing method are the same as those of the twelfth example.

With regard to this suspension body, an inspection for the load bearing layer <NUM> can be carried out directly from the both end portions of the load bearing layer <NUM> in the width direction.

The both end surfaces of the load bearing layer <NUM> in the width direction may be flush with both end surfaces of the covering layer <NUM> in the width direction, or may be retracted from the both end surfaces of the covering layer <NUM> in the width direction to the center side in the width direction.

Further, the configuration as described in the sixteenth example, in which both end portions of the core <NUM> in the width direction are exposed from the covering layer <NUM> to the outside, is applicable also to all other examples and embodiments relating to the configuration of the suspension body.

Next, <FIG> is a sectional view for illustrating the suspension body for an elevator according to a first embodiment of this invention. In the first embodiment, the core <NUM> includes only the load bearing layer <NUM>. Further, the core <NUM> is divided into the plurality of core segments <NUM>. The core segments <NUM> are arranged apart from each other in the width direction of the core <NUM>. The covering layer <NUM> enters a region between the adjacent core segments <NUM>.

A density of the high-strength fibers in a center portion of each of the core segments <NUM> in the thickness direction (Y-axis direction) is higher than a density of the high-strength fibers in each end portion of each of the core segments <NUM> in the thickness direction. Further, the density of the high-strength fibers in each of the core segments <NUM> decreases continuously from the center portion toward each end portion in the thickness direction.

Further, it is preferred that, in a portion of the load bearing layer <NUM> having the highest density of the high-strength fibers <NUM>, namely, the center portion of each of the core segments <NUM> in the thickness direction, a volume content of the high-strength fibers <NUM> be set equal to or larger than <NUM> %, more preferably, equal to or larger than <NUM> %.

Further, it is preferred that, in a portion of the load bearing layer <NUM> having the lowest density of the high-strength fibers <NUM>, namely, each end portion of each of the core segments <NUM> in the thickness direction, the volume content of the high-strength fibers <NUM> be set equal to or smaller than <NUM> %, more preferably, equal to or smaller than <NUM> %.

The sectional shape of each of the core segments <NUM> perpendicular to the length direction (Z-axis direction) is rectangular. The other configurations and the other processes of the manufacturing method are the same as those of the twelfth example or the thirteenth example. The cross section of the portion 101a in <FIG> is the same as that in <FIG> or <FIG>. The cross section of the portion 101b in <FIG> is the same as that in <FIG>, <FIG>, or <FIG>.

With regard to this suspension body, the core <NUM> is divided into the core segments <NUM>, and hence a size of equipment for manufacturing the load bearing layer <NUM> can be reduced.

Next, <FIG> is a sectional view for illustrating the suspension body for an elevator according to a second embodiment of this invention. In the second embodiment, the sectional shape of each of the core segments <NUM> is circular. The other configurations and the other processes of the manufacturing method are the same as those of the first embodiment. The cross section of the portion 101a in <FIG> is the same as that in <FIG> or <FIG>. The cross section of the portion 101b in <FIG> is the same as that in <FIG>, <FIG>, or <FIG>.

With regard to this suspension body, in addition to an effect of enabling reduction in size of equipment for manufacturing the load bearing layer <NUM>, there can be attained such an effect that stress concentration on corner portions of the cross section of each of the core segments <NUM> can be avoided. Thus, separation between the high-strength fibers can be suppressed.

Next, <FIG> is a sectional view for illustrating the suspension body for an elevator according to a third embodiment of this invention. In the third embodiment, the core <NUM> is divided not only in the width direction but also in the thickness direction. With this configuration, the core segments <NUM> are arranged apart from each other in the width direction and the thickness direction of the core <NUM>. The other configurations and the other processes of the manufacturing method are the same as those of the first embodiment. The cross section of the portion 101a in <FIG> is the same as that in <FIG> or <FIG>. The cross section of the portion 101b in <FIG> is the same as that in <FIG>, <FIG>, or <FIG>.

With regard to this suspension body, the size of equipment for manufacturing the load bearing layer <NUM> can be further reduced. Further, the suspension body is more easily bent.

Next, <FIG> is a sectional view for illustrating the suspension body for an elevator according to a fourth embodiment of this invention. The core <NUM> in the fourth embodiment includes six first core segment rows and five second core segment rows. Each of the first core segment rows includes three core segments <NUM> aligned in the thickness direction of the core <NUM> (Y-axis direction). Further, the first core segment rows are arranged apart from each other in the width direction of the core <NUM> (X-axis direction).

The second core segment row is arranged between the adjacent first core segment rows. Each of the second core segment rows includes two core segments <NUM> aligned in the thickness direction of the core <NUM>. The core segments <NUM> of the second core segment row are arranged so as to be staggered from the core segments <NUM> of the first core segment row in the thickness direction of the core <NUM>.

The sectional shape of each of the core segments <NUM> is circular. The other configurations and the other processes of the manufacturing method are the same as those of the third embodiment. The cross section of the portion 101a in <FIG> is the same as that in <FIG> or <FIG>. The cross section of the portion 101b in <FIG> is the same as that in <FIG>, <FIG>, or <FIG>.

With regard to this suspension body, a larger number of the core segments <NUM> can be arranged. Thus, when the core segments <NUM> are used to form a single suspension body having the same strength, readiness of bending can be improved.

Next, <FIG> is a sectional view for illustrating the suspension body for an elevator according to a fifth embodiment of this invention. <FIG> is a plan view for illustrating the core segment <NUM> in <FIG>.

In the fifth embodiment, the high-strength fibers in an inner portion 105a of the load bearing layer <NUM> in each of the core segments <NUM> are arranged in parallel to the length direction of the core <NUM>. The density of the high-strength fibers in the inner portion 105a varies as in any of the above-mentioned embodiments.

Further, the high-strength fibers in an outer peripheral portion 105b of the load bearing layer <NUM> in each of the core segments <NUM> are arranged in a direction crossing the length direction of the core <NUM>. In this example, the high-strength fibers in the outer peripheral portion 105b are arranged in a fabric form. That is, the high-strength fibers in the outer peripheral portion 105b are arranged obliquely to the length direction of the core <NUM>. The other configurations and the other processes of the manufacturing method are the same as those of the first embodiment.

A main function of the load bearing layer <NUM> is to bear the load in the Z-axis direction, and hence the high-strength fibers in the inner portion 105a occupying a large part of the sectional area are arranged along the Z-axis direction. Meanwhile, the high-strength fibers are arranged on the surface of the load bearing layer <NUM> in a fabric form.

Thus, according to the configuration in the fifth embodiment, strength in the oblique direction can be improved. Further, the high-strength fibers in the inner portion 105a aligned in one direction are wrapped with the high-strength fibers arranged in a fabric form, thereby being capable of performing manufacturing steps while integrating the entire high-strength fibers. In this manner, forming becomes relatively easier.

Next, <FIG> is a sectional view for illustrating the suspension body for an elevator according to a sixth embodiment of this invention. In the sixth embodiment, the sectional shape of each of the core segments <NUM> in the fifth embodiment is formed into a circular shape. The other configurations and the other processes of the manufacturing method are the same as those of the fifth embodiment.

With regard to this suspension body, stress concentration on corner portions of the cross section of each of the core segments <NUM> can be avoided. Thus, separation between the high-strength fibers can be suppressed.

The high-strength fibers in the inner portion 105a of each of the core segments <NUM> in the sixth embodiment may be arranged in a spirally twisted state.

Next, <FIG> is a sectional view for illustrating the suspension body for an elevator according to a seventh embodiment of this invention. In the seventh embodiment, a first resin layer <NUM> and a second resin layer <NUM> are interposed between the adjacent core segments <NUM>. The first resin layer <NUM> is made of the same material as that for the impregnation resin of the load bearing layer <NUM>. The second resin layer <NUM> is made of the same material as that for the covering layer <NUM>.

When the suspension body is manufactured, a first plate made of the same material as that for the impregnation resin, and a second plate made of the same material as that for the covering layer <NUM> are continuously arranged between the adjacent core segments <NUM> along the length direction of the core segments <NUM>. Then, the core segments <NUM>, the first plate, and the second plate are integrated with each other, thereby forming the first resin layer <NUM> and the second resin layer <NUM>.

The density of the high-strength fibers in each of the core segments varies as in any of the above-mentioned embodiments. The other configurations and the other processes of the manufacturing method are the same as those of the first embodiment.

With regard to this suspension body, the core segments <NUM> are integrated with each other through intermediation of the first and second resin layers <NUM> and <NUM>. Thus, the core <NUM> is easily bent in a direction of rotating about the Z-axis, and the suspension body easily comes into intimate contact with the surface of the driving sheave <NUM>.

Claim 1:
A suspension body (<NUM>) for an elevator, comprising:
a core (<NUM>) including a load bearing layer (<NUM>) formed of an impregnation resin (<NUM>) and a plurality of high-strength fibers (<NUM>,<NUM>); and
a covering layer (<NUM>) covering at least a part of an outer periphery of the core (<NUM>),
wherein the core (<NUM>) is divided into a plurality of core segments (<NUM>) arranged apart from each other,
wherein the covering layer (<NUM>) enters a region between the core segments (<NUM>) adj acent to each other, and
characterised in that:
a density of the high-strength fibers (<NUM>,<NUM>) in a center portion of each of the core segments (<NUM>) in a thickness direction of each of the core segments (<NUM>) is higher than a density of the high-strength fibers (<NUM>,<NUM>) in both end portions of each of the core segments (<NUM>) in the thickness direction.