Patent Description:
A typical elevator has a configuration where a riding car and a counterweight are coupled with a main rope, and a hoisting machine is interposed in the middle of the main rope to move up and down the riding car. For example, in <FIG>, in a hoistway <NUM> of an elevator, a riding car <NUM> that moves up and down inside the hoistway <NUM> is disposed, and further, a counterweight <NUM> that moves up and down in a direction opposite to the riding car <NUM> inside the hoistway <NUM> is disposed. The riding car <NUM> and the counterweight <NUM> are coupled with a main rope <NUM> suspended in a well bucket manner. The main rope <NUM> is partially wound around a drive pulley <NUM> of a hoisting device <NUM> and a warp pulley <NUM>. The main rope <NUM> moves in conjunction with a turn of the drive pulley <NUM>, and thus the riding car <NUM> and the counterweight <NUM> move up and down inside the hoistway <NUM> corresponding to a movement direction of the main rope <NUM>.

The main rope <NUM> of the elevator is typically made of a wire rope, and thus cannot be directly coupled to the riding car <NUM> or the counterweight <NUM>. In view of this, for example, in a <NUM>:<NUM> roping system elevator as illustrated in <FIG>, an end of the main rope <NUM> is coupled to a rope socket <NUM> having a predetermined shape, and the main rope <NUM> is coupled to the riding car <NUM> and the counterweight <NUM> via this rope socket <NUM>.

<FIG> illustrates a state of fastening a rope socket <NUM> and an end of a main rope <NUM>. The rope socket <NUM> is typically referred to as a wedge type rope socket and includes, for example, a wedge <NUM> and a socket main body <NUM>. The wedge <NUM> includes a rope engaging member having a wedge shape, and the socket main body <NUM> includes a housing portion <NUM> for housing the wedge <NUM>. In a part of an internal surface that forms the housing portion <NUM> of the socket main body <NUM>, a wedge receiving surface <NUM> matching with an inclined surface of the wedge <NUM> is disposed.

In order to fasten the end of the main rope <NUM> to the rope socket <NUM>, first, the end of the main rope <NUM> is inserted into the housing portion <NUM> from an opening <NUM> formed on a distal end side of the socket main body <NUM>, and the end of the main rope <NUM> is extracted from a larger opening <NUM> on an opposite side. Next, the main rope <NUM> extracted from the opening <NUM> is wound around an outer periphery part of the wedge <NUM>, and the main rope <NUM> is folded back. While this state is kept, the wedge <NUM> is inserted from its distal end into the housing portion <NUM>. Then, the end of the main rope <NUM> is extracted from the opening <NUM> and pulled, so as to appropriately dispose the wedge <NUM> inside the housing portion <NUM> of the socket main body <NUM>. Finally, an end process where the main rope <NUM> and its end are brought together such that the main rope <NUM> abut on its end and this part is bound with an anchoring bracket <NUM> to be fixed is performed.

Then, when the end of the main rope <NUM> is fastened to the rope socket <NUM>, an operation of drawing the wedge <NUM> around which the main rope <NUM> is wound into the socket main body <NUM> has been performed by a human force of an operator. When the main rope <NUM> has a surface on which oil is attached to easily slip and the main rope <NUM> has a thick diameter, it becomes difficult to perform an operation of winding the main rope <NUM> corresponding to a curvature of the wedge <NUM> and an operation of drawing the wedge <NUM> into the socket main body <NUM> themselves by a human force.

As a method to solve such a problem, for example, <CIT> (PTL <NUM>) discloses a technique in which gripping members that grip a main rope exposed from a rope socket and its end and a receiving member that engages with a socket main body such that the receiving member is opposed to it are mounted, and a separation distance between the gripping member and the receiving member is increased with separation bolts disposed in the gripping member to draw a wedge into a housing portion of the socket main body.

<FIG> illustrates a rope end fastening device disclosed in PTL <NUM>. This rope end fastening device includes: a gripping member <NUM> that fixes a load side 13A of a main rope <NUM> and its end side 13B that extend outside a socket from an opening of a socket main body <NUM> such that the load side 13A and the end side 13B are sandwiched; a receiving member <NUM> disposed between the gripping member <NUM> and one end portion of the socket main body <NUM> that forms an opening <NUM> in a state where the main rope <NUM> penetrates a housing portion <NUM> to regulate a displacement to the socket main body <NUM> side on the one end portion of the socket main body <NUM>; and separation bolts <NUM> disposed in the gripping member <NUM> to separate the gripping member <NUM> in a direction separating from the receiving member <NUM>. Then, the wedge <NUM> around which the main rope <NUM> is wound can be easily drawn up to an appropriate position in the housing portion <NUM> inside the socket main body <NUM> by separating the gripping member <NUM> and the receiving member <NUM> with the separation bolts <NUM> when an end of the main rope <NUM> is fastened to a rope socket <NUM>.

<CIT> discloses a rope socketing device for an elevator that has a rope holding body for holding a rope and has a holding body displacement device for displacing the rope holding body in the direction moving away from a socket. The holding body displacement device has a screw rod screwed to the rope holding body. The screw rod is configured to be displaced relative to the rope holding body when the screw rod is turned. When the screw rod displaced relative to the rope holding body is received by the socket, the rope holding body is displaced in the direction moving away from the socket. An end of the rope is pulled into a rope insertion hole in the socket by the displacement of the rope holding body in the direction moving away from the socket.

<CIT> discloses a rope end treatment device for elevators, buildings, and the like. The device has a rope clamping device immersed at one end of the base and a socket tensioning device at the other end which can be adjusted.

<CIT> discloses a rope socket that has a substantially triangular stopper end that fits into a loop formed at the end of a wire rope, and is inserted in an internal structure with which it engages in a unidirectional manner.

<CIT> relates to thimbles for fastening conveyor ropes to an intermediate harness of conveyor cages and the like.

Incidentally, the fastening device disclosed in PTL <NUM> does not include a guide function member that guides the gripping member <NUM> and the receiving member <NUM>, and therefore the receiving member <NUM> is sometimes displaced in a direction perpendicular to an extending direction of the main rope <NUM> with respect to the rope socket <NUM> and/or the gripping member <NUM> when the separation bolts <NUM> are screwed to draw the wedge <NUM> into the housing portion <NUM> of the socket main body <NUM>. When the receiving member <NUM> is displaced, a corner portion of the receiving member <NUM> possibly and locally damages a contact part of the main rope <NUM> and the receiving member <NUM>. This causes a problem of damaging a quality of the main rope.

An object of the present invention is to provide a rope end fastening device that suppresses the damage of the main rope to ensure the quality of the main rope, and a rope end fastening method.

The present invention is defined by the appended claims <NUM>-<NUM>.

According to a first aspect of the present invention there is provided a rope end fastening device as specified in claim <NUM>.

According to a second aspect of the present invention there is provided a rope end fastening method as specified in claim <NUM>.

With the present invention, since the socket main body and the movement regulating member are not displaced with respect to the main rope when the wedge is drawn into the housing portion of the socket main body, the damage of the main rope can be suppressed to ensure the quality of the main rope.

While the following describes an embodiment of the present invention in detail using the drawings, the present invention is not limited to the following embodiment, and its scope includes various modifications and application examples in a technical concept of the present invention.

A configuration of a rope end fastening device that becomes the embodiment of the present invention is described in detail based on <FIG>. <FIG> omits illustration of a main rope, and <FIG> illustrates the main rope.

As illustrated in <FIG> and <FIG>, a flat plate shaped base member <NUM> having a predetermined thickness is prepared, and a movement regulating member <NUM> including regulating surfaces <NUM> that regulate a movement of a socket main body <NUM> of a rope socket <NUM> in a direction perpendicular to an extending direction of a main rope <NUM> (see <FIG>) is mounted to the base member <NUM>. On the base member <NUM>, a holding member <NUM> fixed to a load side 33A and an end side 33B (see <FIG>) of the main rope <NUM> is movably placed with respect to the base member <NUM>. Between the holding member <NUM> and the movement regulating member <NUM>, separation members <NUM> such as jack bolts are disposed to increase and decrease a distance between the holding member <NUM> and the movement regulating member <NUM>. The following descriptions of the jack bolts <NUM> will be given as the representative separation members <NUM>.

While <FIG> and <FIG> illustrate a wedge shaped wedge <NUM> housed in a housing portion <NUM> in the socket main body <NUM> for convenience, as illustrated in <FIG>, the main rope <NUM> is wound around this wedge <NUM>, and the wedge <NUM> is housed in the housing portion <NUM> in the socket main body <NUM> to constitute the rope socket <NUM>. The rope socket <NUM> with this wedge <NUM> is to be coupled to a riding car <NUM> and a counterweight <NUM>.

The base member <NUM> is made of a metal plate having a predetermined thickness, and its shape has a rectangular shape. In this embodiment, on the base member <NUM>, the movement regulating member <NUM> is fixedly placed, the holding member <NUM> is movably placed, and thus the base member <NUM> is formed to have a rectangular shape. As described later, the movement regulating member <NUM> is detachably/attachably fixed such that the base member <NUM> is sandwiched with fixing bolts and nuts.

The movement regulating member <NUM> includes a pair of unit movement regulating members 35A and is detachably/attachably mounted to the base member <NUM> with fixing bolts 40A such that the pair of unit movement regulating members 35A are mutually opposed at a predetermined interval in a short side direction of the base member <NUM>. This causes the socket main body <NUM> to be disposed between the unit movement regulating members 35A.

In the unit movement regulating member 35A, the regulating surfaces <NUM> that abut on a pair of inclined surfaces <NUM> formed on side surfaces of the socket main body <NUM> are formed. Since the socket main body <NUM> enters between the unit movement regulating members 35A in a direction identical to an axis line of a longitudinal direction of the base member <NUM> and is disposed, the inclined surfaces <NUM> of the socket main body <NUM> have a shape expanding toward a direction opposite to the entering direction. The regulating surfaces <NUM>, which abut on these inclined surfaces <NUM> and are formed on the unit movement regulating members 35A, also have the shape expanding toward the direction opposite to the entering direction of the socket main body <NUM>.

Accordingly, since disposing the socket main body <NUM> between the unit movement regulating members 35A causes the regulating surfaces <NUM> of the unit movement regulating members 35A to abut on the inclined surfaces <NUM> formed on the side surfaces of the socket main body <NUM>, the movement of the socket main body <NUM> in the entering direction (the longitudinal direction of the base member <NUM>) of the socket main body <NUM> is regulated, and additionally a movement in a direction perpendicular to the extending direction (the short side direction of the base member <NUM>) of the main rope <NUM> is regulated. Here, an angle of the regulating surface <NUM> of the unit movement regulating member 35A is set to match an angle of the pair of inclined surfaces <NUM> of the socket main body <NUM>.

As illustrated in <FIG>, since the unit movement regulating member 35A is configured to be fixed to the base member <NUM> with the fixing bolts 40A and the nuts 40B, when a length between the pair of unit movement regulating members 35A is changed, the unit movement regulating members 35A can be configured to be selectively fixed by forming a plurality of fixing screw holes in the short side direction of the base member <NUM> or can be configured to be fixed by forming oblong holes extending in the short side direction to sandwich and fix the unit movement regulating members 35A and the base member <NUM> with nuts and bolts. With this, when an interval length between the pair of unit movement regulating members 35A is changed corresponding to a body size (shape) of the socket main body <NUM>, the unit movement regulating members 35A can correspond to rope sockets <NUM> having various sizes.

The holding member <NUM> is formed to have a square shape, and respective two arc-shaped rope fixing grooves <NUM> are formed along the axis line of the longitudinal direction and an axis line of the short side direction of the base member <NUM>. As illustrated in <FIG>, a pair of rope fixing grooves 41A that houses and fixes the load side 33A and the end side 33B of the main rope <NUM> along the axis line of the longitudinal direction of the base member <NUM>, and a pair of rope fixing grooves 41B that houses and fixes the load side 33A and the end side 33B of the main rope <NUM> along the axis line of the short side direction of the base member <NUM> are formed. The rope fixing groove <NUM> has a cross-sectional shape having a cross-sectional surface orthogonal to a direction in which the rope fixing groove <NUM> extends, and the cross-sectional surface is formed to have an arc shape.

Accordingly, the pair of rope fixing grooves 41A and the pair of rope fixing grooves 41B are formed to orthogonally intersect. The arc-shaped rope fixing grooves 41A and the rope fixing grooves 41B have different radii, and one of the rope fixing groove 41A and the rope fixing groove 41B is selected corresponding to a diameter of the main rope <NUM>.

The holding member <NUM> includes a pair of unit holding members 36A. Housing the load side 33A and the end side 33B of the main rope <NUM> in the rope fixing grooves <NUM> formed on each of the pair of unit holding members 36A and strongly sandwiching to fix the pair of unit holding members 36A with fixing bolts 42A and nuts 42B (see <FIG>) ensure the integrally fixed holding member <NUM> and main rope <NUM>.

<FIG> illustrate a specific shape of the holding member <NUM>. As illustrated in <FIG> and <FIG>, on one surface of the unit holding members 36A, the respective pairs of rope fixing grooves 41A and 41B having arc shapes orthogonally intersect to form cross shapes. Also on the other surface of the unit holding member 36A, the respective pairs of rope fixing grooves 41A and 41B having arc shapes orthogonally intersect to form cross shapes.

Respective diameters of the rope fixing grooves <NUM> formed on the one surface and the other surface of the unit holding members 36A are configured to have different diameters. Thus, the one surfaces of the unit holding members 36A can correspond to two main ropes <NUM> having different diameters, and the other surfaces of the unit holding members 36A can similarly correspond to two main ropes <NUM> having further different diameters, which can correspond to the four main ropes <NUM> having different diameters in total.

<FIG> is a view of the holding member <NUM> illustrated in <FIG> and <FIG> viewed from a side, and the holding member <NUM> includes the two unit holding members 36A illustrated in <FIG> where the pair of rope fixing grooves <NUM> having an identical small diameter and arc shapes are butted to be fastened and fixed with the fixing bolts 42A and the nuts 42B as fasteners. While not illustrated in the drawing, in practice, the load side 33A and the end side 33B of the main rope <NUM> are housed to be fixed.

Similarly, <FIG> is a view of the holding member <NUM> illustrated in <FIG> and <FIG> viewed from a side, and the holding member <NUM> includes the two unit holding members 36A illustrated in <FIG> where the pair of rope fixing grooves <NUM> having an identical large diameter and arc shapes are butted to be fastened and fixed with the fixing bolts 42A and the nuts 42B as fasteners. While this is not also illustrated in the drawing, in practice, the load side 33A and the end side 33B of the main rope <NUM> are housed to be fixed.

While the unit holding member 36A has both surfaces on which the pair of rope fixing grooves <NUM> having a cross shape is formed, the unit holding member 36A may have the one surface on which the pair of rope fixing grooves <NUM> is formed, and the pairs of rope fixing grooves <NUM> may be each formed to have a cross shape. Further, while the rope fixing groove <NUM> has a cross-sectional surface formed to have an arc shape, the cross-sectional surface may be formed to have a rectangular shape and preferably have a square shape.

Here, as illustrated in <FIG> and <FIG>, the holding member <NUM> is configured to move along an arrow ARW. In view of this, when the holding member <NUM> is placed on the base member <NUM>, the nuts 42B interfere with a surface of the base member <NUM>.

To avoid this, as illustrated in <FIG>, on the base member <NUM>, oblong holes (guide grooves) <NUM> that movably guide the nuts 42B are formed. While this oblong hole <NUM> is formed along the axis line of the longitudinal direction of the base member <NUM> and has any length, the length is configured to be equal to or more than at least a length separated with the jack bolts <NUM>. It is only necessary that the oblong hole <NUM> has a width having a length to house the nut 42B, and further, is configured to have a width to guide the nut 42B.

Besides this, on the surface of the base member <NUM>, guide protrusions may be disposed to guide the movement of the holding member <NUM>. These guide protrusions can be integrally disposed with the base member <NUM> along side surfaces of the holding member <NUM>, which moves on the base member <NUM>, such that the guide protrusions are across the holding member <NUM>. This ensures the stabilized tension operation of the main rope <NUM>.

Thus, the holding member <NUM> moves while being guided by the oblong holes <NUM> or the guide protrusions with respect to the base member <NUM>, and this ensures the reduced possibility of damaging the main rope <NUM> when the wedge <NUM> is retracted.

Returning to <FIG> and <FIG>, the jack bolts <NUM> are disposed between the unit movement regulating members 35A and the unit holding members 36A. The jack bolt <NUM> has a function to increase and reduce the distance between the unit movement regulating member 35A and the unit holding member 36A. When the distance between the unit movement regulating member 35A and the unit holding member 36A is increased with the jack bolt <NUM>, the holding member <NUM> is separated from the movement regulating member <NUM>, and the movement of the holding member <NUM> is transmitted to the main rope <NUM>.

Therefore, when the wedge <NUM> enters an inside of the housing portion <NUM> of the socket main body <NUM> to reach up to an appropriate position together with the main rope <NUM>, the increase movement with the jack bolts <NUM> is terminated at the position. Afterwards, when screwing the holding member <NUM> with the fixing bolts 42A and the nuts 42B is released, the holding member <NUM> is separated into the unit holding members 36A and the holding member <NUM> can be removed from the main rope <NUM>. Further, when the rope socket <NUM> is removed from the movement regulating member <NUM>, finally, the main rope <NUM> and the rope socket <NUM> are strongly fastened.

Next, the jack bolt <NUM> will be described. As illustrated in <FIG>, <FIG>, the unit movement regulating member 35A has an end surface 35B on the holding member <NUM> side, and a nut plate <NUM> is fixed on each of the end surfaces 35B. A threaded jack bolt screw hole <NUM> as a separation member screw hole is formed near an approximate center of the nut plate <NUM>, and the nut plate <NUM> is fixed to the end surface 35B of the unit movement regulating member 35A on the holding member <NUM> side with fixing bolts <NUM> so as to be across this jack bolt screw hole <NUM>. Inside the unit movement regulating member 35A, a jack bolt housing hole <NUM> is formed from the jack bolt screw hole <NUM> to the unit movement regulating member 35A.

Accordingly, as illustrated in <FIG>, the threaded jack bolt <NUM> is screwed with the jack bolt screw hole <NUM> in the nut plate <NUM> to be housed in the jack bolt housing hole <NUM>. When the jack bolt <NUM> is rotated to be moved in the holding member <NUM> direction in this state, the distance between the unit movement regulating member 35A and the unit holding member 36A can be increased. The jack bolt screw hole <NUM> can be directly formed at a part of the jack bolt housing hole <NUM> without using the nut plate <NUM>.

When the distance between the unit movement regulating member 35A and the unit holding member 36A is increased, the holding member <NUM> is separated from the movement regulating member <NUM>, and the movement of the holding member <NUM> is transmitted to the main rope <NUM>. Therefore, when the wedge <NUM> enters the inside of the housing portion <NUM> of the socket main body <NUM> to reach up to the appropriate position together with the main rope <NUM>, the increase movement with the jack bolts <NUM> is terminated at the position.

In this embodiment, since the movement regulating member <NUM> is configured to be fixed to the base member <NUM> with the fixing bolts 40A and the nuts 40B, and further, the holding member <NUM> is configured to be guided and moved along the base member <NUM>, the holding member <NUM> and the movement regulating member <NUM> are not displaced in the direction perpendicular to the extending direction of the main rope <NUM>, and further, the jack bolts <NUM> are constantly pressed onto predetermined positions on the holding member <NUM>, thus ensuring the operation in the stable state.

Further, if, for example, the screw portion in the jack bolt screw hole <NUM> in the nut plate <NUM> with which the jack bolt <NUM> is screwed is damaged because of aged deteriorations and thus does not function, it is only necessary to replace the nut plate <NUM>. This brings down the repair cost. Further, the nut plate <NUM> can be easily replaced using the fixing bolts <NUM>.

While with the above-described embodiment the jack bolts <NUM> are mounted to the unit movement regulating member <NUM> via the nut plates <NUM>, the jack bolts <NUM> can also be mounted to the surface of the unit holding member 36A opposed to the unit movement regulating member 35A via the nut plates <NUM>.

Next, a procedure of a fastening operation of the main rope <NUM> and the rope socket <NUM> using the rope end fastening device according to the above-described embodiment will be described using <FIG>.

It is assumed that the fastening operation of the main rope <NUM> and the rope socket <NUM> is performed on site, and thus it is considered that the fastening operation is performed while the base member <NUM> to which the movement regulating member <NUM> is mounted is placed on a floor surface, or is performed while the base member <NUM> in a standing state is mounted to a working board WP standing upright from the floor surface. In this embodiment, the fastening operation is performed in the state illustrated in <FIG> where the base member <NUM> in the standing state is mounted to the working board WP standing upright from the floor surface.

In order to fasten the main rope <NUM> to the rope socket <NUM>, first, the socket main body <NUM> is disposed between the pair of unit movement regulating members 35A to cause the regulating surfaces <NUM> of the unit movement regulating members 35A to abut on the inclined surfaces <NUM> of the socket main body <NUM>, so as to regulate the movement of the socket main body <NUM> to the holding member <NUM> side. At this time, the jack bolt <NUM> is in a state where the jack bolt <NUM> is screwed with the nut plate <NUM> to be housed in the jack bolt housing hole <NUM> of the unit movement regulating member 35A by a predetermined amount.

Next, one end of the main rope <NUM> is inserted into the housing portion <NUM> from an opening 32A (see <FIG>) formed on a distal end portion of the socket main body <NUM>, and the main rope <NUM> is extracts from a larger opening 32B (see <FIG>) on its opposite side.

Next, the main rope <NUM> extracted from the opening 32B of the socket main body <NUM> is folded back. While this state is kept, the wedge <NUM> is inserted into and disposed inside the housing portion <NUM> of the socket main body <NUM> such that the main rope <NUM> is wound.

Next, the load side 33A and the end side 33B of the main rope <NUM> that extend to an outside (the axis line direction side of the base member <NUM>) of the socket main body <NUM> from the opening 32A of the socket main body <NUM> are sandwiched with the unit holding members 36A to mutually fix the main rope <NUM> and the holding member <NUM>. In this case, the pair of unit holding members 36A, which has the rope fixing grooves <NUM> corresponding to a rope diameter of the main rope <NUM>, sandwiches the load side 33A and the end side 33B of the main rope <NUM>, the main rope <NUM> is strongly fixed with the fixing bolts 42A and the nuts 42B, and further, the nuts 42B are housed in the oblong holes <NUM> of the base member <NUM> to be movably engaged.

Next, the jack bolts <NUM> are rotated to move toward the holding member <NUM> direction with, for example, a wrench, so as to increase the distance between the unit movement regulating members 35A and the unit holding member 36A. Increasing the distance between the unit movement regulating members 35A and the unit holding members 36A separates the holding member <NUM> from the movement regulating member <NUM> to transmit the movement of the holding member <NUM> to the main rope <NUM>. Therefore, when the wedge <NUM> enters the inside of the housing portion <NUM> of the socket main body <NUM> to reach up to the appropriate position together with the main rope <NUM>, increasing the distance between the unit movement regulating members 35A and the unit holding members 36A with the jack bolts <NUM> is terminated at the position. The jack bolts <NUM> are pressed onto the predetermined positions on the holding member <NUM>, and this ensures drawing the wedge <NUM> up to the appropriate position inside the housing portion <NUM> of the socket main body <NUM> in the stable state.

Thus, since the holding member <NUM> moves while being guided by the base member <NUM>, when the wedge <NUM> is drawn into the housing portion <NUM> of the socket main body <NUM>, the holding member <NUM> is not displaced in the direction perpendicular to the extending direction of the main rope <NUM> with respect to the socket main body <NUM>, thus suppressing the possibility of damaging the main rope <NUM> to ensure the quality of the rope.

As described above, the rope end fastening device of the present invention includes: the base member having a predetermined length; the movement regulating member that is fixedly disposed on the base member and includes the regulating surfaces that regulate the movement of the socket main body to the rope side and regulate the movement of the socket main body in the direction perpendicular to the extending direction of the rope; the holding member that is fixed to the load side and the end side of the rope extracted from the socket main body and is movably disposed with respect to the base member; and the separation member that is disposed between the holding member and the movement regulating member and changes the distance between the holding member and the movement regulating member.

With this, the socket main body and the movement regulating member are not displaced with respect to the main rope when the wedge is drawn into the housing portion of the socket main body, and this suppresses damaging the main rope to ensure the quality of the main rope.

Claim 1:
A rope end fastening device comprising a rope end fastening mechanism that fastens a socket main body (<NUM>) and a rope (<NUM>) by drawing a wedge (<NUM>), around which the rope (<NUM>) is wound, up to a predetermined position in a housing portion (<NUM>) formed in the socket main body (<NUM>) of a rope socket (<NUM>),
wherein the rope end fastening mechanism includes:
a base member (<NUM>) having a predetermined length and a rectangular shape;
a movement regulating member (<NUM>) that includes a pair of unit movement regulating members (35A) across the socket main body (<NUM>) including regulating surfaces (<NUM>), the regulating surfaces (<NUM>) regulating a movement of the socket main body (<NUM>) in a longitudinal direction of the base member (<NUM>) in which the socket main body (<NUM>) enters between the unit movement regulating members (35A), and regulating a movement of the socket main body (<NUM>) in a short side direction of the base member (<NUM>), the unit movement regulating members (35A) being fixed to the base member (<NUM>) to ensure adjusting a mutual interval length;
a holding member (<NUM>) that is fixed to a load side (33A) and an end side (33B) of the rope (<NUM>) extracted from the socket main body (<NUM>) and is movably disposed with respect to the base member (<NUM>); and
a separation member (<NUM>) that is disposed between the holding member (<NUM>) and the movement regulating member (<NUM>) and changes a distance between the holding member (<NUM>) and the movement regulating member (<NUM>) .