Patent Description:
Outdoor equipment, such as the <NUM> Customer Premise Equipment (CPE), needs to be fixed on an outdoor installation foundation (e.g., a wall or a utility pole). At present, fixing devices for fixing outdoor equipment mainly include holding poles, expansion screws, sticking back adhesive, and the like. Once the fixing device fails, the outdoor equipment will fall from the installation foundation, leading to a risk of injuring people.

<CIT> provides a tension guide wheel assembly for used in a unwinding stage of a stranding machine, which includes a damping spool unwinding seat, with a spool thereon for releasing to-be-used steel wire.

The present disclosure relates to a damping device and a CPE assembly including the damping device.

The features of the damping device and the CPE assembly according to embodiments of the present disclosure are set out in the appended set of claims.

In order to make those having ordinary skills in the art to better understand the technical schemes of the present disclosure, a damping device and a CPE assembly including the damping device according to the present disclosure will be described in detail below in conjunction with the accompanying drawings.

Embodiments of the present disclosure will be more fully described hereinafter with reference to the accompanying drawings, but the embodiments may be embodied in different forms, and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to make the present disclosure thorough and complete, and enable those having ordinary skills in the art to fully understand the scope of the present disclosure.

The various embodiments in the present disclosure and the various features in the embodiments can be combined to derive other embodiments not explicitly described.

As used herein, the term "and/or" includes any and all combinations of one or more related enumerated items.

The terms used herein are only used to describe specific embodiments, and are not intended to limit the present disclosure. As used herein, singular forms "a" and "the" are also intended to include plural forms, unless otherwise indicated clearly in the context. It should be also understood that when used in the present description, the terms "include" and "made of" specify the presence of said features, integers, steps, operations, elements and/or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof.

Unless otherwise defined, all the terms (including technical and scientific terms) used herein have the same meanings as commonly understood by those having ordinary skills in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in the backgrounds of the related art and the present disclosure, and will not be interpreted as having idealized or over-formal meanings, unless so defined explicitly herein.

According to an aspect of the present disclosure, a damping device is provided. As shown in <FIG>, the damping device includes a housing <NUM>, a guide roller <NUM>, a friction cylinder <NUM>, and a buffer shaft (see reference numeral <NUM> in <FIG>). As shown in <FIG>, the buffer shaft <NUM> includes a shaft body <NUM> and a buffer <NUM>.

A mounting portion of the buffer <NUM> is fixedly arranged in the housing <NUM> relative to the friction cylinder <NUM>, and one end of the shaft body <NUM> is connected with the buffer <NUM>.

The other end of the shaft body <NUM> is arranged on a bottom plate of the housing <NUM>, and the guide roller <NUM> is rotatably arranged on the shaft body <NUM>.

The friction cylinder <NUM> is sleeved on the guide roller <NUM> and separated from the housing <NUM>. The guide roller <NUM> has an outer diameter less than an inner size of the friction cylinder <NUM>, so that there exists a gap between an inner surface of the friction cylinder <NUM> and an outer surface of the guide roller <NUM>.

The housing <NUM> is provided with a first wire inlet hole 112a and a first wire outlet hole 112b in a sidewall <NUM>. The friction cylinder <NUM> is provided with a second wire inlet hole 130a and a second wire outlet hole 130b. When the first wire inlet hole 112a is aligned with the second wire inlet hole 130a, the first wire outlet hole 112b can be aligned with the second wire outlet hole 130b.

The damping device according to the present disclosure is used cooperatively with outdoor equipment (e.g., CPE), with the outdoor equipment arranged outdoors and the damping device according to the present disclosure arranged indoors. During mounting, one end of a wire <NUM> of the outdoor equipment is passed through the first wire inlet hole 112a of the housing <NUM> to enter the housing <NUM>, and then passed through the second wire inlet hole 130a of the friction cylinder <NUM> to enter the gap between the friction cylinder <NUM> and the guide roller <NUM>. The wire goes around the guide roller <NUM> in the gap between the friction cylinder <NUM> and the guide roller <NUM> and is passed through the second wire outlet hole 130b in the friction cylinder <NUM>. Finally, the wire is passed through the first wire outlet hole 112b in the sidewall <NUM> of the housing <NUM> to get out of the damping device, and is connected to indoor electronic equipment, so that the friction cylinder <NUM> is suspended in the housing <NUM> by the wire <NUM> under an initial state.

When the outdoor equipment is fixed on a corresponding installation foundation, as shown in <FIG>, in the damping device, the friction cylinder <NUM> is suspended in the housing <NUM> of the damping device under the action of the wire <NUM>, and the guide roller <NUM> is not in contact with the friction cylinder <NUM>. When the wire <NUM> is pulled at a low speed, the guide roller <NUM> can rotate around the shaft body, to complete the assembly of the damping device with the wire of outdoor equipment.

In the damping device, the guide roller <NUM> is arranged in the housing by means of the buffer shaft. When the buffer <NUM> is subjected to an external force, the buffer <NUM> is elastically deformed, and thus can move within a certain range. Therefore, when the wire <NUM> is subjected to an external force, the force is transferred to the friction cylinder <NUM>, and the mounting portion of the buffer <NUM> can move within a certain range under the drive of the friction cylinder <NUM>. Since there exists the gap between the guide roller <NUM> and the friction cylinder <NUM>, when the friction cylinder <NUM> moves to a position where the inner surface of the friction cylinder <NUM> is in contact with the outer surface of the guide roller <NUM>, if the wire continues to move and drive the guide roller <NUM> to rotate, a friction force will be generated between the guide roller <NUM> and the friction cylinder <NUM> to prevent further rotation of the guide roller <NUM>.

If the fixing device of the outdoor equipment fails and the outdoor equipment comes off from the installation foundation and drops down, the wire will be driven to move down. As shown in <FIG>, under the downward force brought by the outdoor equipment, the wire tends to change from a curved state into a straight state, to lift the friction cylinder <NUM>, and the friction cylinder <NUM> drives the buffer <NUM> to move up, resulting that the guide roller <NUM> generates an acting force on the buffer <NUM> to compress the buffer <NUM>. Consequently, the buffer <NUM> is elastically deformed to an extent that the friction cylinder <NUM> comes into contact with the guide roller <NUM>. After the guide roller <NUM> comes into contact with the friction cylinder <NUM>, the guide roller <NUM> is stuck under the action of the friction force and cannot further rotate around the shaft body <NUM>. During the dropping of the outdoor equipment, the wire is always closely bonded to the guide roller <NUM>, so there also exists a friction force between the surface of the wire and the surface of the guide roller <NUM>. When the guide roller <NUM> is stuck to stop rotating, the wire cannot quickly slide over the guide roller <NUM> as well, resulting in that the moving speed of the wire is decreased or even the wire stops moving. After the moving speed of the wire is decreased, the dropping speed of the outdoor equipment connected with the wire is decreased as well. After the wire stops moving, the outdoor equipment stops dropping as well. Thus, the risk of the outdoor equipment coming off from the installation foundation to injure people can be decreased.

It should also be noted that since the buffer <NUM> can be elastically deformed under the effect of an external force, when the outdoor equipment drops, due to a buffering effect of the buffer <NUM>, the wire moves for a short period of time rather than stops immediately. Therefore, the damping device according to the present disclosure can also prevent the wire from being broken due to a sudden stop, thereby preventing the outdoor equipment from stopping operation due to dropping and preventing the dropping of the outdoor equipment from affecting the use of the outdoor equipment by users. For example, when the outdoor equipment is CPE, the provision of the damping device on the wire of the CPE can prevent communication interruption.

When the buffer <NUM> is in a deformed state, there exists elastic potential energy, which generates a restoring force after being released. After the force applied on the wire by the outdoor equipment due to dropping is released (for example, after the outdoor equipment is fixedly remounted), the elastic potential energy is released. Under the effect of the restoring force of the buffer <NUM>, the friction cylinder <NUM> can return to an initial position (i.e., a position where the friction cylinder <NUM> is located when the buffer <NUM> is in an initial state). When the wire is gently pulled, the guide roller <NUM> will rotate and allow the wire to pass through the damping device, and the remounting of the outdoor equipment and corresponding components can be completed.

In the present disclosure, the specific structure of the buffer <NUM> is not particularly limited. For example, the buffer <NUM> may be a spring, an elastic sheet or other elastic structures. The buffer <NUM> may also be an electromagnet. When the guide roller <NUM> drops into contact with the friction cylinder, the electromagnet can be energized and attracts a magnetically conductive part arranged on the guide roller <NUM> or the friction cylinder <NUM>, such that the guide roller <NUM> comes into contact with the friction cylinder <NUM> and generates a friction force.

In the present disclosure, there is no particular requirement for the surface state of the friction cylinder <NUM>, as long as the friction force generated when the inner surface of the friction cylinder <NUM> is in contact with the outer surface of the guide roller <NUM> can prevent the guide roller <NUM> from continuing to rotate.

In the present disclosure, there is no particular limitation on the materials of the friction cylinder <NUM> and the guide roller <NUM>. For example, the friction cylinder <NUM> and the guide roller <NUM> may be made of plastic, respectively.

In the present disclosure, the specific structure of the housing <NUM> is not particularly limited as well. For example, as shown in <FIG>, the housing <NUM> may include a bottom plate <NUM>, a sidewall <NUM> arranged around the bottom plate <NUM>, and a top plate <NUM> arranged opposite to the bottom plate <NUM>. It should be noted that although the housing <NUM> shown in <FIG> is of a rectangular octahedral structure, the present disclosure is not limited thereto, and the housing <NUM> may also be of other structures such as a cylindrical structure or a prismatic structure.

In the present disclosure, there is no particular limitation on how to fix the friction cylinder <NUM> relative to the mounting portion of the buffer <NUM>. For example, the buffer <NUM> may be directly arranged on the wall of the friction cylinder by utilizing an adhesive, or a fastener.

In the present disclosure, in order to facilitate arrangement, the damping device may further include a mounting plate <NUM>. The mounting plate <NUM> is fixedly arranged at one end of the friction cylinder <NUM> facing away from the bottom plate <NUM> and is arranged opposite to the bottom plate <NUM>. The mounting plate <NUM> extends toward the interior of the friction cylinder <NUM> such that at least a part of an orthographic projection of the mounting plate <NUM> on the bottom plate <NUM> falls within an area defined by an orthographic projection of the friction cylinder <NUM> on the bottom plate <NUM>. The mounting portion of the buffer <NUM> is fixedly arranged on a part of the mounting plate <NUM> corresponding to an internal space of the friction cylinder <NUM>.

By provision of the mounting plate <NUM>, the shaft body <NUM> can be located inside the friction cylinder <NUM>, and the guide roller <NUM> can be conveniently mounted, to allow a gap to exist between the outer surface of the guide roller <NUM> and the inner surface of the friction cylinder <NUM>.

As an implementation, if there is no external force after the damping device is assembled, the outer surface of the guide roller <NUM> is evenly spaced from the inner surface of the friction cylinder <NUM>. Accordingly, after the damping device is assembled and the wire <NUM> is passed through the damping device, since the friction cylinder <NUM> is a cylinder, the axis of the shaft body <NUM> coincides with the axis of the friction cylinder <NUM> in case of no external force. When the friction cylinder <NUM> is a cylinder, the outer diameter of the guide roller <NUM> is less than an inner diameter of the friction cylinder <NUM>.

In order to limit the moving range of the friction cylinder <NUM>, as an implementation, as shown in <FIG>, the mounting plate <NUM> is provided with a mounting hole <NUM>. The buffer <NUM> is arranged in the mounting hole <NUM>, and one end of the shaft body <NUM> is inserted into the mounting hole <NUM>.

Because the mounting hole <NUM> has a limited size, the one end of the shaft body <NUM> can only move in a space defined by the mounting hole <NUM>, thus ensuring that the friction cylinder <NUM> can inevitably move to a position where the friction cylinder <NUM> is in contact with the guide roller <NUM>. Moreover, once the friction cylinder <NUM> moves to the position where it is in contact with the guide roller <NUM>, the friction cylinder <NUM> will not make a large movement, ensuring that the friction force between the guide roller <NUM> and the friction cylinder <NUM> can lock the guide roller.

In the present disclosure, the mounting hole <NUM> may or may not run through the mounting plate <NUM> in a thickness direction, as long as one opening of the mounting hole faces the bottom plate of the housing.

As an implementation, the mounting hole is rectangular, and when the damping device and the outdoor equipment are mounted in place, a length direction of the mounting hole is a vertical direction. Thus, the end of the shaft body <NUM> facing away from the bottom plate of the housing can reciprocate in the vertical direction under the restriction of the mounting hole <NUM>.

As described above, the housing <NUM> includes the bottom plate <NUM>, and one end of the shaft body <NUM> faces the bottom plate <NUM>. In the present disclosure, there is no particular limitation on how the shaft body <NUM> is mounted on the bottom plate <NUM> of the housing <NUM>. For example, the shaft body <NUM> may be adhered to the bottom plate <NUM> by an adhesive, or the bottom plate <NUM> may be provided with a mounting hole into which the shaft body <NUM> is inserted.

In the embodiment shown in <FIG>, the bottom plate <NUM> is provided with an arc-shaped guide slot <NUM>, and the other end of the shaft body <NUM> is inserted into the arc-shaped guide slot <NUM>. Thus, after the buffer <NUM> is compressed and brings the guide roller <NUM> into contact with the friction cylinder <NUM>, under the further action of the wire, one end of the shaft body <NUM> can still swing under the guidance of the guide slot <NUM>, increasing the duration of an impact from the wire on the damping device, and thus the impact of the damping device can be reduced (correspondingly, a counter-acting force applied on the wire by the damping device can be reduced). That is, the guide roller <NUM> will not stop rotating suddenly, preventing the wire from being broken due to a sudden stop of the guide roller <NUM>. As an implementation, when the force received by the buffer <NUM> is greater than twice an initial elastic force of the buffer <NUM>, the shaft body <NUM> swings under the guidance of the guide slot <NUM>.

<FIG> is a schematic diagram of the damping device viewed from the side of the top plate. The circular dotted line in <FIG> shows an outline of an end face of the friction cylinder <NUM> facing the bottom plate of the housing, and the arc-shaped dotted line in <FIG> shows a moving trajectory of one end of the shaft body <NUM> located in the guide slot <NUM>.

<FIG> is a schematic diagram of the damping device viewed from the side of the bottom plate. The circular dotted line in <FIG> shows an outline of an end face of the friction cylinder <NUM> facing away from the bottom plate of the housing. Moreover, <FIG> also shows that the shaft body <NUM> can slide under the guidance of the guide slot <NUM>.

In order to facilitate the restoration of the friction cylinder <NUM>, as an implementation, the housing is further provided with an auxiliary restoring mechanism on the bottom plate. The auxiliary restoring mechanism is arranged at one end of the guide slot and can provide the shaft body with a thrust for moving away from the auxiliary restoring mechanism when the shaft body is in contact with the auxiliary restoring mechanism.

In the present disclosure, the specific structure of the auxiliary restoring mechanism is not particularly limited. For example, the auxiliary restoring mechanism may be a spring or an elastic sheet arranged at a tail end of the guide slot. When the shaft body moves to the tail end of the guide slot, the shaft body compresses the auxiliary restoring mechanism, and a restoring force generated by the auxiliary restoring mechanism helps the shaft body drive the friction cylinder to return to the initial position.

As an implementation, as shown in <FIG>, the housing is further provided with an accommodating cavity <NUM> communicating with the arc-shaped guide slot <NUM> on the bottom plate. One end of the shaft body <NUM> facing the bottom plate of the housing is inserted into the guide slot <NUM> to come into sealed contact with a sidewall of the guide slot <NUM>. The damping device may further include a retractable cover, which is arranged on the bottom plate of the housing and covers the accommodating cavity. The retractable cover is in sealed contact with the shaft body and can extend and retract with the movement of the shaft body, such that a sealed chamber is defined by the accommodating cavity, the guide slot, the retractable cover and the shaft body.

When the damping device in use, hydraulic oil may be arranged in the accommodating cavity. Since the guide slot communicates with the accommodating cavity, when the shaft body is at the initial position, the hydraulic oil is distributed in the guide slot and the accommodating cavity. After the shaft body swings to completely press the hydraulic oil into the accommodating cavity, the hydraulic oil will generate a pressure to push the shaft body, helping restoring the shaft body.

In the present disclosure, the hydraulic oil may not be injected into the accommodating cavity <NUM> of the damping device first. Only when the damping device needs to be assembled with the outdoor equipment, is the hydraulic oil injected into the accommodating cavity <NUM>.

In order to facilitate operation, the hydraulic oil may be arranged in advance into the sealed chamber formed by the accommodating cavity <NUM>, the guide slot <NUM> and the retractable cover.

Of course, gas pressure generated by compressed gas can also be used to help restore the shaft body instead of arranging the hydraulic oil in the accommodating cavity.

As described above, the wire <NUM> goes around the guide roller <NUM> in the gap between the guide roller <NUM> and the friction cylinder <NUM>. In order to facilitate the wire <NUM> to drive the guide roller <NUM> to rotate and to realize self-locking after the guide roller <NUM> comes into contact with the friction cylinder <NUM>, the wire <NUM> may go around the guide roller <NUM> by half a circle.

The friction cylinder <NUM> and the housing <NUM> are arranged such that when the wire <NUM> is passed through the first wire inlet hole, the second wire inlet hole, the second wire outlet hole and the first wire outlet hole in sequence and the buffer <NUM> is in the initial state, the first wire inlet hole, the second wire inlet hole, the second wire outlet hole and the first wire outlet hole are arranged on the same straight line, so that the wire goes around the guide roller by at least half a circle. That is, when the friction cylinder <NUM> is in the initial state, the first wire inlet hole 112a, the second wire inlet hole 130a, the second wire outlet hole 130b and the first wire outlet hole 112b are sequentially arranged on the same straight line, so that the wire goes around the guide roller by at least half a circle.

As an implementation of the present disclosure, as shown in <FIG>, the friction cylinder <NUM> and the housing <NUM> are arranged such that when the wire <NUM> is passed through the first wire inlet hole, the second wire inlet hole, the second wire outlet hole and the first wire outlet hole in sequence and the buffer <NUM> is in the initial state, the first wire inlet hole 112a, the second wire inlet hole 130a, the second wire outlet hole 130b and the first wire outlet hole 112b are sequentially arranged on a straight line where the diameter of the guide roller <NUM> is located, so that the wire <NUM> can go around the guide roller <NUM> by half a circle. That is, when the friction cylinder <NUM> is in the initial state, the first wire inlet hole 112a, the second wire inlet hole 130a, the second wire outlet hole 130b and the first wire outlet hole 112b are sequentially arranged on the straight line where the diameter of the guide roller <NUM> is located, so that the wire <NUM> can go around the guide roller <NUM> by half a circle.

In another aspect of the present disclosure, a CPE assembly is provided, which includes a CPE. The CPE assembly further includes the damping device described above according to the embodiments of the present disclosure. A wire of the CPE is passed through the first wire inlet hole and the second wire inlet hole respectively to enter the gap between the friction cylinder and the guide roller, and the wire goes around the guide roller and is passed through the second wire outlet hole and the first wire outlet hole to get out of the damping device.

During use, the CPE is arranged outdoors, and the damping device according to the present disclosure is arranged indoors. During mounting, one end of the wire <NUM> of the CPE is passed through the first wire inlet hole 112a of the housing <NUM> to enter the housing <NUM>, and the end of the wire <NUM> is then passed through the second wire inlet hole 130a of the friction cylinder <NUM> to enter the gap between the friction cylinder <NUM> and the guide roller <NUM>. The wire goes around the guide roller <NUM> in the gap between the friction cylinder <NUM> and the guide roller <NUM> and is passed through the second wire outlet hole 130b in the friction cylinder <NUM>. Finally, the wire is passed through the first wire outlet hole 112b in the sidewall <NUM> of the housing <NUM> to get out of the damping device, and is connected to indoor electronic equipment. Thus, the friction cylinder <NUM> is suspended in the housing <NUM> by the wire <NUM> in an initial state.

When the CPE is fixed on a corresponding installation foundation, as shown in <FIG>, in the damping device, the friction cylinder <NUM> is suspended in the housing <NUM> of the damping device under the action of the wire <NUM>, and the guide roller <NUM> is not in contact with the friction cylinder <NUM>. When the wire <NUM> is pulled at a low speed, the guide roller <NUM> can rotate around the shaft body, to complete the assembly of the damping device with the wire of outdoor equipment.

In the damping device, the guide roller <NUM> is arranged in the housing by means of the buffer shaft. When the buffer <NUM> is subjected to an external force, the buffer <NUM> is elastically deformed, and thus can move within a certain range. Therefore, when the wire <NUM> is subjected to an external force, the force is transferred to the shaft body <NUM>, and the buffer <NUM> can move within a certain range under the drive of the shaft body <NUM>, so that the friction cylinder <NUM> can also move within a certain range. Since there exists the gap between the guide roller <NUM> and the friction cylinder <NUM>, when the friction cylinder <NUM> moves to a position where the inner surface of the friction cylinder <NUM> is in contact with the outer surface of the guide roller <NUM>, if the wire continues to move and drive the guide roller <NUM> to rotate, a friction force will be generated between the guide roller <NUM> and the friction cylinder <NUM> to prevent further rotation of the guide roller <NUM>.

If the fixing device of the CPE fails and the CPE comes off from the installation foundation and drops down, the wire will be driven to move down. As shown in <FIG>, the wire is subjected to a downward force brought by the outdoor equipment, and the guide roller <NUM> drives the shaft body <NUM> to press the buffer <NUM>, so that the buffer <NUM> is elastically deformed to an extent that the friction cylinder <NUM> comes into contact with the guide roller <NUM>. After the guide roller <NUM> comes into contact with the friction cylinder <NUM>, the guide roller <NUM> is stuck under the effect of the friction force and cannot further rotate around the shaft body <NUM>. During the dropping of the CPE, the wire is always tightly closely bonded to the guide roller <NUM>, so there also exists a friction force between the surface of the wire and the surface of the guide roller <NUM>. When the guide roller <NUM> is stuck to stop rotating, the wire cannot quickly slide over the guide roller <NUM> as well, resulting in that the moving speed of the wire is decreased or even the wire stops moving. After the moving speed of the wire is decreased, the dropping speed of the CPE connected with the wire is decreased as well. After the wire stops moving, the CPE stops dropping as well. Thus, the risk of the CPE coming off from the installation foundation to injure people can be decreased.

It should also be noted that since the buffer <NUM> can be elastically deformed under the effect of an external force, when the CPE drops, due to a buffering effect of the buffer <NUM>, the wire moves for a short period of time rather than stops moving immediately. Therefore, the damping device according to the present disclosure can also prevent the wire from being broken due to a sudden stop, thereby preventing the CPE from stopping operation due to dropping and preventing communication interruption.

When the buffer <NUM> is in a deformed state, a restoring force can be generated. After the force applied on the wire by the CPE due to dropping is released (for example, after the CPE is fixedly remounted), the elastic potential energy is released. Under the effect of the restoring force of the buffer <NUM>, the friction cylinder <NUM> can return to an initial position. When the wire is gently pulled, the guide roller <NUM> will rotate and allow the wire to pass through the damping device, and the remounting of the CPE and corresponding components can be completed.

For the CPE, the wire <NUM> is a data cable.

Claim 1:
A damping device, characterized in that it comprises: a housing (<NUM>), a guide roller (<NUM>), a friction cylinder (<NUM>), and a buffer shaft (<NUM>), the buffer shaft (<NUM>) comprising a shaft body (<NUM>) and a buffer (<NUM>), wherein:
a mounting portion of the buffer (<NUM>) is fixedly arranged in the housing (<NUM>) relative to the friction cylinder (<NUM>), and one end of the shaft body (<NUM>) is connected with the buffer (<NUM>);
the other end of the shaft body (<NUM>) is arranged on a bottom plate (<NUM>) of the housing (<NUM>), and the guide roller (<NUM>) is rotatably arranged on the shaft body (<NUM>);
the friction cylinder (<NUM>) is sleeved on the guide roller (<NUM>) and separated from the housing (<NUM>), and the guide roller (<NUM>) has an outer diameter less than an inner size of the friction cylinder (<NUM>), so that there exists a gap between an inner diameter of the friction cylinder (<NUM>) and an outer diameter of the guide roller (<NUM>); and
the housing (<NUM>) is provided with a first wire inlet hole (112a) and a first wire outlet hole (112b) in a sidewall (<NUM>), the friction cylinder (<NUM>) is provided with a second wire inlet hole (130a) and a second wire outlet hole (130b), and the first wire outlet hole (112b) is arranged to be aligned with the second wire outlet hole (130b) when the first wire inlet hole (112a) is aligned with the second wire inlet hole (130a).