JP6763145B2 - Workbench - Google Patents

Description

The present invention relates to a workbench that can be used when inspecting a switchboard or the like installed in a high place with a measuring instrument.

Optical pulse testers (OTDRs) are used in optical communication systems such as public optical communication systems and LANs (Local Area Networks) for measurement work that is regularly performed to monitor the deterioration of optical fibers. Has been. The OTDR receives an optical pulse from one end of an optical fiber, reflects it at each point in the longitudinal direction of the optical fiber, and analyzes the distance distribution of the optical power that returns to the incident end to the loss of the optical fiber and the connection point. It is a measuring instrument that measures the distance, connection loss, reflection amount generated at the connection point, and the distance to the break point when the fiber breaks.

In the building where the optical communication system is introduced, the main optical fiber cable laid by the telecommunications company is wired in the premises via the optical switchboard. Several to dozens of optical switchboards are retractably stored in the switchboard rack. The optical switchboard is provided with dozens to hundreds of connectors to which the tip terminals of the optical fiber can be connected. In the optical fiber measurement work, the optical fibers are pulled out one by one from the optical switchboard and connected to the OTDR measurement connector for measurement. Therefore, when 10 optical switchboards provided with 100 connectors are stored in one switchboard rack, the above-mentioned measurement work must be repeated 1000 times, so that the efficiency of the measurement work is desired. There is.

The optical switchboard of the switchboard rack may have a height of 2 m or more at the top, and a stepladder is used when measuring the optical fiber with the optical switchboard at such a high altitude. In general stepladders for aerial work, the size of the top plate is relatively small to prevent the danger of work being carried out on the top plate, so it is not possible to place the OTDR on the top plate of the stepladder. .. Therefore, in the conventional measurement work, the OTDR is installed on the floor, the measurer pulls out the optical fiber from the optical switchboard pulled out by climbing the stepladder, and the pulled out optical fiber is connected to the measurement cord of the OTDR or the measurement connector of the OTDR main body. , OTDR is operated to perform measurement. Therefore, in the conventional measurement work, it is necessary to move up and down the stepladder many times in order to measure one optical fiber, which not only deteriorates the work efficiency but also puts a physical burden on the measurer. There was a problem of getting bigger.

There is a step ladder as a workbench that can be used for aerial work like a stepladder and that an operator can ride on a top plate to perform work (see, for example, Patent Document 1). The platform is provided with a safety bar that can be grasped by the operator on the top plate. There is also known a stepladder with a workbench that can be folded along the outside of the stepladder when not in use and can form a workbench with a large area on the same surface as the top plate when in use (for example, patent). Reference 2). With these stepladders and stepladders with workbenches, the OTDR can be placed on the top plate.

Japanese Unexamined Patent Publication No. 2011-09206 Japanese Unexamined Patent Publication No. 07-102757

However, in the stepping stone described in Patent Document 1, the safety bar arranged above the top plate may interfere and the OTDR may not be placed. In addition, the safety bar may interfere with the pull-out operation of the optical switchboard, or the measurement cord or optical fiber must be routed so as to avoid the safety bar, which may reduce work efficiency.

Further, in the stepladder with a workbench described in Patent Document 2, a top plate having a sufficiently large area can be obtained, and since there are no obstacles on the top plate, an OTDR can be placed. However, since the premises space where the switchboard rack is installed may be small, even if a general stepladder can be installed, a large stepladder such as a stepladder with a workbench in Patent Document 2 may not be installed. is there.

An object of the present invention is to provide a workbench on which a measuring instrument can be placed on a top plate while having an installation space equivalent to that of a conventional general stepladder in order to solve the above problems. To do.

In order to solve the above problems, the invention according to claim 1 is a workbench provided with a stepladder and a work plate. The stepper has first and second legs including a pair of legs, a plurality of treads arranged between the pair of legs, and a top plate arranged at the uppermost part between the pair of legs. The upper end portions of the first leg body and the second leg body are openably and closably connected to each other. The first and second work plates are provided on the pair of legs of the first and second legs , respectively, and are stored between the open positions arranged on the same surface as the top plate and the legs. It is individually movable between the storage position and the storage position, and one end is rotatably provided between the pair of legs so that the legs can rotate between the opening position and the storage position. At the storage position, the legs are stored between the pair of legs and between the uppermost tread plate of the plurality of tread plates and the top plate .

According to the first aspect of the present invention, the first and second legs are opened to erect the stepladder, and the space between the pair of legs depends on the size of the measuring instrument or the like placed on the top plate. The work plate stored in is moved to an opening position arranged on the same surface as the top plate.

The invention according to claim 2 is a slide mechanism capable of sliding the work plate on the workbench according to claim 1 so that there is no gap between the work plate and the top plate when the work plate is moved from the storage position to the opening position. To be equipped.

According to a third aspect of the present invention, in the workbench according to the first or second aspect , both ends are connected to a leg and a work plate, and a support for supporting the work plate when the work plate is moved to an open position. Equipped with stays.

The invention according to claim 4 is the workbench according to any one of claims 1 to 3 , wherein the work plate is provided with a power strip.

According to the first aspect of the invention, the work plate housed between the pair of legs is arranged on the same surface as the top plate according to the size of the measuring instrument or the like placed on the top plate. Since it can be moved to the open position, even a relatively large measuring instrument can be placed on the top plate and the work plate. Therefore, unlike the conventional measurement work, a large number of optical fiber measurement work can be performed without raising and lowering the stepladder many times, so that the efficiency of the measurement work at a high place is improved and the body of the measurer is improved. Burden is also reduced. Further, since the stepladder can be made to have the same size as a conventional general stepladder, it is possible to perform measurement work at a high place even in a narrow space. Further, since the work plate can be stored between the pair of legs when not in use, it can also be used as a normal stepladder.

According to the invention of claim 1 , since the work plate is further provided on each of the first leg body and the second leg body, a wider space for mounting the measuring instrument can be provided. .. Further, the amount of protrusion of the work plate from the stepladder can be reduced by separately providing the first and second work plates as compared with the case where a large work plate is provided on one side of the leg body. This makes it easier to handle the workbench. Further, since the first and second work plates can be opened and closed individually, it is possible to obtain a highly convenient workbench.

According to the invention of claim 2 , since the work plate can be slid by the slide mechanism so that there is no gap between the work plate and the top plate, the legs of the measuring instrument are placed between the top plate and the work plate. It is possible to prevent depression and the components of the measuring instrument from falling. In addition, if the measuring instrument has no risk of the legs and components of the measuring instrument falling, it can be used with a gap between the top plate and the work plate, so work so that there is no gap. A wider installation space can be obtained than when the board is slid.

According to the third aspect of the present invention, since the support stay that supports the work plate when the work plate is moved to the open position is provided, even a heavy measuring instrument can be stably placed. it can.

According to the invention of claim 4 , since the work plate is provided with the power tap, the power supply of the measuring instrument mounted on the work plate can be taken from a close position. Therefore, power can be supplied to the measuring instrument on the workbench even when there is no outlet nearby and there is no extension cord.

It is a perspective view which shows the open state and the stored state of the work board of the workbench which carried out this invention. It is a side view which shows the structure of a workbench. It is a top view which shows the structure of a workbench. It is explanatory drawing which shows the state which performs the measurement work on the workbench. It is a side view which shows the workbench of the 2nd Embodiment of this invention.

(Embodiment 1)
Hereinafter, the present invention will be described based on the illustrated embodiment.

As shown in FIGS. 1 to 3, the workbench 1 has a stepladder portion 3 having a first leg body 2A and a second leg body 2B, and a first work plate 4A and a second work plate 4B. Be prepared. The first leg body 2A and the second leg body 2B include a pair of leg portions 21A and 21B, a plurality of tread plates 22A and 22B disposed between the pair of leg portions 21A and 21B, respectively, and a pair of legs. The top plates 23A and 23B are provided at the uppermost portions between the portions 21A and 21B, respectively. The upper ends of the first leg 2A and the second leg 2B are openably and closably connected to each other.

A stay 24 is provided between the first leg body 2A and the second leg body 2B to support the stepladder portion 3 in an open state in which the stepladder portion 3 can be erected by the first leg body 2A and the second leg body 2B. Has been done. The stepladder 3 is made of a lightweight metal such as aluminum.

One end of the first work plate 4A and the second work plate 4B is rotatably provided between a pair of leg portions 21A and 21B of the first leg body 2A and the second leg body 2B, respectively. .. As shown in FIG. 1 (A), the first work plate 4A and the second work plate 4B are housed between the pair of legs 21A and 21B, respectively, and are shown in FIG. As described above, the top plates 23A and 23B are rotatable between the opening positions arranged on the same surface. The first working plate 4A and the second working plate 4B are made of a lightweight metal such as aluminum, like the stepladder 3.

As shown in FIG. 2, the first work plate 4A and the second work plate 4B can be slidable so that there is no gap between the top plates 23A and 23B when moving from the storage position to the opening position. The slide mechanisms 41A and 41B are provided. The slide mechanisms 41A and 41B include a pair of pins 411A and 411B provided inside the pair of legs 21A and 21B, and a pair of arms provided on the first work plate 4A and the second work plate 4B, respectively. It is composed of elongated holes 413A and 413B of 412A and 412B. The pair of pins 411A and 411B are inserted into the elongated holes 413A and 413B. Therefore, in the first work plate 4A and the second work plate 4B, the pins 411A and 411B are slidable along the elongated holes 413A and 413B.

As shown in FIGS. 3A and 3B, between the first leg body 2A and the second leg body 2B and the first working plate 4A and the second working plate 4B, respectively. Support stays 414A and 414B having both ends connected are provided. The support stays 414A and 414B are foldable at the center and have a locking mechanism that locks when extended straight. The support stays 414A and 414B have a strength capable of stably supporting even when a heavy measuring instrument is placed on the first working plate 4A and the second working plate 4B.

On the back side of the second work plate 4B, a power tap 5 to which the measuring instruments mounted on the first work plate 4A and the second work plate 4B can be connected, and a cord 51 connected to the power tap 5 are provided. A winding pin 52 for winding and storing is provided. When connecting the plug 53 of the cord 51 to the outlet at the measurement location, the cord 51 is unwound from the winding pin 52, placed along the inside of the leg 21B, and fixed to the fixing member 211 provided inside the leg 21B. To do. As a result, the cord 51 can be connected to the outlet so as not to get in the way.

Next, a case where the optical fiber is measured using the workbench 1 will be described with reference to FIG. Reference numeral 6 is an OTDR used for measuring an optical fiber. Further, reference numeral 7 is a switchboard rack in which a plurality of optical switchboards 71 are retractably housed, and is installed in the communication premises of a building in which an optical fiber cable is laid by a telecommunications company. The optical switchboard 71 is provided with about several tens to hundreds of connectors to which the tip terminals of the optical fiber can be connected. In the optical fiber measurement work, optical fibers are pulled out one by one from the optical switchboard 71 and connected to the OTDR measurement connector for measurement.

The optical switchboard 71 of the switchboard rack 7 may have a height of 2 m or more at the top. The workbench 1 of the present embodiment is used when the optical fiber is measured by the optical switchboard 71 at such a high place. The measurer S raises the workbench 1 in front of the switchboard rack 7 and rotates the first workbench 4A or the second workbench 4B to the open position according to the size of the OTDR 6 to be placed.

Further, the measurer S slides the first work plate 4A and the second work plate 4B by the slide mechanisms 41A and 41B, and the first work plate 4A and the second work plate 4B and the top plates 23A and 23B are operated. Adjust so that there is no gap between the and. A general OTDR has an installation area of A4 to A3 size, a height of 20 cm, and a weight of about 10 kg. In this embodiment, an OTDR having a size that can be mounted by opening the first working plate 4A is described as an example.

The measurer S places the OTDR 6 on the first work plate 4A and the top plate 23A, climbs the first or second step plate 21B of the stepladder portion 3, and pulls out the upper optical switchboard 71. Next, the measurer S pulls out the optical fiber from the optical switchboard 71, connects the pulled out optical fiber to the measurement cord of the OTDR6 or the measurement connector of the main body of the OTDR6, and operates the OTDR6 to perform the measurement.

According to the workbench 1 of the present embodiment, the first workbench 4A or the second workbench housed between the pair of legs 21A, 21B depends on the size of the OTDR6 placed on the top plates 23A, 23B. Since the work plate 4B of No. 1 can be moved to an opening position arranged on the same surface as the top plates 23A and 23B, even a relatively large size OTDR 6 can be placed. Therefore, unlike the conventional measurement work, a large number of optical fiber measurement work can be performed without raising and lowering the stepladder many times, so that the efficiency of the measurement work at a high place is improved and the body of the measurer is improved. Burden is also reduced. Further, since the stepladder 3 has the same size as a conventional general stepladder, it is possible to perform measurement work at a high place even in a narrow space. Further, since the first work plate 4A or the second work plate 4B can be stored between the pair of leg portions 21A and 21B when not in use, it can also be used as a normal stepladder.

Further, since the first work plate 4A or the second work plate 4B is provided on each of the leg portions 21A and 21B of the first leg body 2A and the second leg body 2B, a space for mounting the OTDR 6 is provided. Can be provided wider. Further, rather than providing a large-sized work plate on one side of the leg body, the work plate protrudes from the stepladder 3 by being provided separately in the first work plate 4A or the second work plate 4B. Since the amount is small, the workbench 1 can be easily handled. Further, since the first workbench 4A or the second workbench 4B can be opened and closed individually, it is possible to obtain a workbench 1 having high usability.

Further, since the first work plate 4A or the second work plate 4B can be slid by the slide mechanisms 41A and 41B so as to eliminate the gap between the top plates 23A and 23B, the first work plate 4A or the second work plate 4B can be slid with the top plates 23A and 23B. It is possible to prevent the legs of the OTDR 6 from falling between the first work plate 4A or the second work plate 4B and the OTDR6 components from falling. Further, if the OTDR 6 has no risk of the legs and components of the OTDR 6 falling, it is used in a state where a gap is provided between the top plates 23A and 23B and the first work plate 4A or the second work plate 4B. Therefore, it is possible to obtain a wider mounting space than when the first work plate 4A or the second work plate 4B is slid so that no gap is generated.

Further, when the first work plate 4A or the second work plate 4B is moved to the open position, the support stays 414A and 414B for supporting the first work plate 4A or the second work plate 4B are provided. Even a heavy OTDR 6 can be placed stably.

Further, since the power tap 5 is provided in the second work 4B, the power supply of the OTDR 6 mounted on the first work plate 4A and the second work plate 4B can be taken from a close position. Therefore, power can be supplied to the OTDR 6 on the first work plate 4A and the second work plate 4B even when there is no outlet nearby and there is no extension cord.

(Embodiment 2)
Next, a second embodiment of the present invention will be described. Regarding the same configuration as that of the first embodiment, the same reference numerals are used and detailed description thereof will be omitted. The workbench 10 shown in FIG. 5 includes fixed belts 11A and 11B whose one ends are locked to the first work plate 4A and the second work plate 4B, respectively. Plastic locking tools 111A and 111B are provided at the tips of the fixing belts 11A and 11B. The fixing belts 11A and 11B are extended on the OTDR 6 placed on the first working plate 4A and the second working plate 4B, and the locking tools 111A and 111B are locked to each other. As a result, the OTDR 6 can be fixed to the workbench 1, so that it is possible to prevent the OTDR 6 from falling due to vibration or the like when the measuring staff S moves up and down the workbench 1. Instead of the plastic locking tool, the fixing belt may be locked with a hook-and-loop fastener or a magnet.

Although the embodiment of the present invention has been described in detail above, the specific configuration is not limited to this embodiment, and even if there is a design change or the like within a range that does not deviate from the gist of the present invention. Included in the invention. For example, an example of measuring an optical fiber using an OTDR has been described, but it can be used for measurement work at various high places such as output measurement of a radio device and measurement of an optical end station device.

1, 10 Workbench 2A 1st leg 2B 2nd leg 3 Stepladder 4A 1st work plate 4B 2nd work plate 5 Power strip 6 Optical pulse tester (OTDR)
7 Switchboard rack 11A, 11B Fixed belt 21A, 21B Pair of legs 22A, 22B Step plate 23A, 23B Top plate 41A, 41B Slide mechanism 71 Optical switchboard 414A, 414B Support stay

Claims (4)

A first and second leg having a pair of legs, a plurality of treads arranged between the pair of legs, and a top plate arranged at the uppermost portion between the pair of legs. A stepped portion having a body and connecting the upper end portions of the first leg body and the second leg body so as to be openable and closable.
Between the opening position provided on each of the pair of legs of the first and second legs and arranged on the same surface as the top plate and the storage position stored between the legs. The first and second work plates that can be moved individually with
With
One end of the first and second work plates is rotatably provided between the pair of legs and rotates between the opening position and the storage position, and the pair at the storage position. It is stored between the legs of the above and between the uppermost tread plate of the plurality of tread plates and the top plate .
A workbench characterized by that. The work plate includes a slide mechanism that can slide so that there is no gap between the work plate and the top plate when the work plate is moved from the storage position to the opening position.
The workbench according to claim 1 , wherein the workbench is characterized in that. Both ends are connected to the leg portion and the work plate, and a support stay for supporting the work plate moved to the opening position is provided.
The workbench according to claim 1 or 2 . The work plate is provided with a power strip.
The workbench according to any one of claims 1 to 3 , characterized in that.

Images