JP4189434B2 - Power supply system - Google Patents

Description

  The present invention relates to a cable for supplying power to a refrigerated container or the like, and in particular, the cable is not damaged even if an excessive force is applied to the cable during power supply. The present invention relates to a power supply cable (power supply system) having a lifting structure.

FIG. 8 shows an example of a power supply cable (power supply system) for supplying power to the refrigerated container.
The power supply cable 30 branches from the trunk line 1 fixed to the ceiling hanging bracket 2 by the binding band 3 and uses a curl cord 33 spirally wound around a support body 32. A hook connector 13 for power feeding is attached to the cable (refer to Patent Document 1 for a curled cord).

  The power supply cable 30 can be vertically expanded and contracted by a curl cord 33, and when the refrigeration container 24 is supplied with power, the hook connector 13 at the tip of the power supply cable 30 is pulled and inserted into the power supply unit 25 of the refrigeration container 24.

After the power feeding, when the hook connector 13 at the tip of the power feeding cable 30 is removed from the power feeding section 25, the curl cord 33 contracts and lifts to the ceiling side, so that the work is not disturbed.
JP 2001-358472 A

However, after feeding with feeding cable 30 shown in FIG. 8, when thus moving the forget refrigerated containers 24 and remove the hook connector 13 erroneously takes an excessive tension to the feed cable 30, tension on the power supply cable 30 In such a state, it may come into contact with the corner of the refrigeration container 24 and be rubbed and damaged. Furthermore, there is a possibility that it may lead to a serious accident such as disconnection of the cable or dropping of the cable from the ceiling.

  In addition, a similar accident may occur when it comes into contact with another adjacent refrigeration container during power feeding.

  Furthermore, as a result of such an accident, when the power supply is not originally used (not used), the power supply cable 30 is tangled or the curl cord 33 is stretched despite the structure that does not hinder the ceiling and interfere with it. In some cases, it did not lift up to the ceiling side and could not perform its original function and could interfere.

  Therefore, the object of the present invention is to prevent the cable from being damaged even if an excessive force is applied to the cable due to contact between adjacent refrigeration containers during power feeding, and to reliably lift the cable to the ceiling so that it does not get in the way when power is not fed. It is to provide a feeding cable having a structure.

In order to solve the above problems, a power feeding system according to the present invention includes a branch line and an intermediate cable having a hook connector attached to an apparatus at one end, and the branch line and the intermediate cable are attached to a tip of the branch line. A flat blade connector and a flat blade plug attached to the other end of the intermediate cable to form an intermediate joint portion, and the intermediate joint portion is disposed above the upper corner of the device ; The flat blade connector and the flat blade of the intermediate joint portion are connected when the flat blade connector is connected to a wire provided in a retractable manner from the take-up reel and the intermediate cable is subjected to a force greater than the separation force of the intermediate joint portion. the power supply cable and plug are configured to separate disposed at a plurality of locations, the separating force is greater than the feeding tension of the take-up reel, and said intermediate cable The flat blade connector and the flat blade plug being less than the tension damage.

  It is preferable to form a band spring for a protector on the outer periphery of the intermediate cable.

  It is preferable to form a wire drawing length from the take-up reel shorter than a cable length of the branch line including the flat blade connector.

  The branch line is branched from a trunk line, and the trunk line is fixed to a ceiling hanging bracket, a take-up reel is attached to the ceiling suspension fitting, the take-up reel is connected to a drop-off prevention fitting, and a reel is attached. It is preferable to connect to the ceiling hanging bracket via a bracket.

  According to the power supply system of the present invention, the cable is not damaged even if an excessive force is applied to the cable during power supply to the refrigeration container, and when the power is not supplied, the cable is reliably hung from the ceiling. It will rise.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
(Overall structure of power supply cable (power supply system))
In FIG. 1, the structure of the electric power feeding cable (electric power feeding system) of this embodiment is shown.
This power supply cable (power supply system) has a branch line 5 branched from a main line 1 fixed to a ceiling hanging bracket 2 by a binding band 3 and an intermediate cable 12 having a hook connector 13 attached to a refrigeration container at one end. is doing. The branch line 5 and the intermediate cable 12 are fitted with a flat blade connector 6 attached to the tip of the branch line 5 and a flat blade plug 11 attached to the other end of the intermediate cable 12 to form an intermediate joint portion 15. ing.

Further, the flat blade connector 6 is connected to a wire 10 which is provided so as to be extendable and retractable from a take-up reel 7 attached to the ceiling suspension fitting 2 by a reel attachment fitting 8. The take-up reel 7 is also connected to a drop-off prevention chain 9 for preventing the drop-off, and is connected to the ceiling hanging bracket 2 via a reel mounting bracket 8.
A band spring 14 for a protector is formed on the surface of the intermediate cable 12.

(Intermediate joint part)
In FIG. 2, the structure centering on the intermediate joint part 15 in a power feeding cable (power feeding system) is further shown.
The intermediate joint portion 15 has a structure in which the flat blade plug 11 is separated and dropped from the flat blade connector 6 as shown in FIG. 2 when an excessive force is applied to the intermediate cable 12.

  The separation force of the intermediate joint portion 15 is larger than the pulling force of the take-up reel 7 and smaller than the tension that damages the intermediate cable 12, the flat blade connector 6, and the flat blade plug 11. Specifically, it is desirable to set it to 10 kgf or less from the viewpoint of usability.

(Winding reel)
FIG. 3 shows an enlarged view of the take-up reel 7.
A reel mounting bracket 8 is attached to the take-up reel 7 via a drop-off prevention bracket 17 so that connection to the ceiling suspension bracket 2 shown in FIG. Further, if necessary, a drop-off prevention chain 9 is connected to the drop-off prevention metal fitting 17 (see FIG. 1) so that the drop-off can be prevented even when an excessive tension is applied.

The take-up reel 7 is provided with a wire 10 having a predetermined take-up force, and the wire 10 is pulled out when a tension exceeding the take-up force is applied. The wire 10 is provided with a stopper 19 to prevent excessive shrinkage during winding.
Here, the predetermined winding force exceeds the total weight of the flat blade connector 6 connected to the wire 10, the intermediate cable 12, the hook connector 13, and the band spring 14 for the protector.

  Further, the length of the wire 10 drawn from the take-up reel 7 is shorter than the cable length of the branch line 5 (including the flat blade connector 6). For this reason, when tension is applied to the cable with the wire 10 of the take-up reel 7 fully extended, the connection of the intermediate joint portion 15 (flat blade connector 6 and flat blade plug 11) is disconnected and separated. .

(How to use the power supply cable (power supply system))
With reference to FIG. 4, the usage method of the electric power feeding cable (electric power feeding system) of this embodiment is demonstrated.
First, a plurality of power supply cables 20 having the structure shown in FIG. 1 are set by being attached to an outlet by a hook plug 22 of the trunk 1 terminal, and power is supplied from the outlet.

  In order to supply electric power to the refrigeration container 24 having the compressor 26, the power supply cable 20 positioned above the refrigeration container 24 is pulled, the wire 10 is pulled out from the take-up reel 7, and the hook connector at the tip of the power supply cable 20 is pulled. 13 is set in the power feeding unit 25 of the refrigeration container 24.

  After the power supply is completed, the hook connector 13 is removed from the power supply unit 25 of the refrigerated container 24. Then, the wire 10 is taken up by the take-up force of the take-up reel 7, and the cable is lifted and reliably lifted to the ceiling side to a position where it does not interfere with the refrigeration container 24.

  When an excessive force is applied to the cable during power feeding, tension is applied to the cable with the wire 10 of the take-up reel 7 fully extended. For this reason, the connection of the intermediate joint portion 15 (the flat blade connector 6 and the flat blade plug 11) is disconnected and separated. Therefore, it is possible to prevent a major accident such as cable damage, disconnection, or cable dropping from the ceiling. Further, the power feeding cable 20 is not entangled and cannot be lifted to the ceiling side, and the function of reliably lifting to the ceiling side can be sufficiently exhibited.

Further, it is desirable that the intermediate joint portion 15 be positioned above the corner of the refrigeration container 24 in order to make the pulling force that the intermediate joint portion 15 separates constant.
Furthermore, it is desirable that the hanging position of the flat blade connector 6 at the tip of the branch line 5 after the intermediate joint portion 15 is separated is a position that can be reached by the operator and that is not caught when the door of the refrigeration container 24 is opened and closed.

(Mounting method of feeding cable (feeding system))
With reference to FIG.5 and FIG.6, the attachment method of this electric power feeding cable (electric power feeding system) is demonstrated.
First, the ceiling hanger 2 is attached to a predetermined location on the ceiling (FIG. 5A).
Next, a cable having a flat blade connector 6 attached in advance to the tip of the branch line 5 branched from the main line 1 is fixed to a predetermined binding position of the ceiling hanging bracket 2 with a binding band 3 (FIG. 5B).
Next, the take-up reel 7 is attached to the ceiling hanger 2, and the tip of the wire 10 of the take-up reel 7 is hooked on the flat blade connector 6. The take-up reel 7 is connected to the reel mounting bracket 8 via the drop-off prevention chain 9 or directly, and is mounted to the ceiling hanging bracket 2 by the reel mounting bracket 8 (FIG. 5C).

Next, it fixes to the wire 10 with the binding band 31 in the state in which the branch line 5 was wound (FIG. 6 (a)). The fixing with the binding band 31 is not always necessary and may not be fixed.
Further, the flat blade plug 11 of the intermediate cable 12 having a hook connector 13 connected to the refrigerated container is connected to the flat blade connector 6 (FIG. 6B), and the power supply cable is completed (FIG. 6C). .

(Effects of this power supply cable (power supply system))
(1) Even if an excessive tension is applied to the cable, it is safe because it is separated by the intermediate joint portion 15.
(2) The cable will not be damaged even if an excessive force is applied to the cable due to contact between adjacent refrigerated containers during power feeding.
(3) After the power supply is completed, the power supply cable does not get entangled or stretched as in the prior art. For this reason, when it does not supply electric power, it can be reliably lifted to the ceiling side so as not to get in the way.
(4) The take-up reel 7 and the ceiling hanger 2 can be connected with one touch, and it is easy to include a drop-off prevention measure.
(5) Since the pull-out length of the wire 10 from the take-up reel 7 is shorter than the cable length of the branch line 5 (including the flat blade connector 6), even if an excessive tensile force is applied, the tensile force All are not directly on the branch line 5 and are safe.
(6) Since the belt spring 14 for the protector is formed on the intermediate cable 12, it is not damaged even if an external force is applied to the cable.

(Other embodiments)
In the present embodiment, the hook connector 13 is L-shaped because the cable hangs from the ceiling, but it may be straight.
Further, in this embodiment, a structure using a take-up reel is used, but a structure using a tension spring or the like may be used as long as it has a similar function.
In this embodiment, the cable is suspended from the ceiling. However, the cable may be pulled out from the wall surface or the like according to the installation environment.

As shown in FIG. 7, the intermediate joint portion 15 is disposed at an upper (a) or lower (b) position with respect to the upper corner portion of the refrigeration container 24, and the angle θ is changed in the range of 0 to 90 ° for each. In this case, an experiment was conducted on how the pulling forces F ₁ and F ₂ of the intermediate joint portion 15 change. The results are shown in Table 1.

From the results of Table 1, when the intermediate joint 15 is above the upper corner of the refrigeration container 24 (FIG. 7A) , the pulling force F ₁ does not change even if the angle θ changes, but the intermediate joint When the portion 15 is on the lower side (FIG. 7B) , the pulling force F ₂ increases as the angle θ increases. From this, it became clear that it is preferable to arrange the intermediate joint portion 15 above the upper corner portion of the refrigeration container 24.

It is a front view which shows the structure of the electric power feeding cable (electric power feeding system) of one Embodiment of this invention. It is a front view which shows the structure centering on the intermediate joint part of FIG. It is a block diagram of the take-up reel of FIG. 1, (a) is a front view, (b) is a side view. It is explanatory drawing of the electric power feeding cable (electric power feeding system) of this embodiment. It is explanatory drawing of the attachment method of the electric power feeding cable (electric power feeding system) of this embodiment. It is explanatory drawing of the attachment method of the electric power feeding cable (electric power feeding system) of this embodiment. It is explanatory drawing of the test method of an Example. It is a front view which shows the structure of the conventional electric power feeding cable (electric power feeding system).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Trunk line 2 Ceiling suspension metal fitting 3 Binding band 4 Branch cable 5 Branch line 6 Flat blade connector 7 Take-up reel 8 Reel mounting bracket 9 Drop prevention chain 10 Wire 11 Flat blade plug 12 Intermediate cable 13 Hook connector 14 Protector spring 15 Intermediate joint Part 17 Drop-off prevention bracket 19 Stopper 20 Power supply cable (power supply system)
24 Refrigeration container 26 Compressor 30 Power supply cable (power supply system)
31 Binding band 32 Support 33 Curl cord

Claims (4)

A flat blade connector having a branch line and an intermediate cable provided at one end with a hook connector attached to the device, the branch line and the intermediate cable being attached to the tip of the branch line, and being attached to the other end of the intermediate cable Fitted with a flat blade plug formed to form an intermediate joint, and the intermediate joint is disposed above the upper corner of the device ;
The flat blade connector and the flat blade of the intermediate joint portion are connected when the flat blade connector is connected to a wire provided in a retractable manner from the take-up reel and the intermediate cable is subjected to a force greater than the separation force of the intermediate joint portion. The power supply cable configured to separate from the plug is disposed at a plurality of locations, and the separation force is larger than the drawing tension of the take-up reel, and the intermediate cable, the flat blade connector, and the flat blade plug Power supply system characterized in that the tension is smaller than the damaging tension .   The power feeding system according to claim 1, wherein a band spring for a protector is formed on an outer periphery of the intermediate cable. The draw length of wire from the winding reel, the feed system of claim 1, wherein said formed shorter than the cable length of the branch line including the flat blade connector. The branch line is branched from a trunk line, the trunk line is fixed to a ceiling hanging bracket, a winding reel is attached to the ceiling hanging bracket, and the winding reel is connected to a drop prevention bracket, and The power feeding system according to claim 1 , wherein the power feeding system is connected to the ceiling hanging bracket via a reel mounting bracket.

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