KR101587590B1

KR101587590B1 - Cable tray

Info

Publication number: KR101587590B1
Application number: KR1020150122542A
Authority: KR
Inventors: 정윤석
Original assignee: 정윤석; (주)광명이엔지
Priority date: 2015-08-31
Filing date: 2015-08-31
Publication date: 2016-01-26

Abstract

A plurality of grid links (11) of connectors (20) protruding through a plurality of grid holes (11) of two side rails (10) with a plurality of blades (31) The fastening box 41 located at both ends of the rung 40 is attached to the inner surface of the two side rails 10 which are opposed to each other, Each bolt 50 is tightly coupled to the nut hole 410 of the outer side wall 412 of the fastening box 41 and the nut hole 410 of the inner side wall 413, 413 are deformed to be bent toward the outer wall 412 so that the nut holes 410 of the bolts 50 and the inner wall 413 are more strongly pressed and engaged with each other, Trail's path The coupling force of the lateral coupling side of the cable tray having a weaker coupling force can be greatly improved as compared with the bidirectional coupling.

Description

Cable tray {Cable tray}

More particularly, to a cable tray manufactured by dividing a unitary member having a predetermined size and connecting the unit members as necessary according to the length or path of the cable.

Various types of cable trays are used to protect and support flexible elongated objects such as electrical cables, power cables, communication cables, hydraulic tubes, pneumatic tubes, etc., on the ceiling or wall of a building. Since the length and route of the cable installed in the building are not constant, the cable tray is produced by dividing the unit members of a certain size into units and connecting the unit members as necessary according to the length or route of the cable. Cable trays must be constructed to have a rigidity that can withstand the load of cables above all. If the entire cable tray is made in the form of a flat plate, a large amount of material is consumed in making the cable tray, So that it is not preferable. Accordingly, the floor is generally implemented as a rung arranged at regular intervals in order to reduce the weight of the cable tray.

Due to the shape of the cable tray, the longitudinal coupling of the cable tray can be coupled through a large area contact, but the lateral coupling of the cable tray is coupled through the narrow area contact, There is a problem in that the lateral coupling between the two is weak. This causes the cable tray to be slightly heavier, or if the operator climbs up to the cable tray for cable extension or repair, the upper edge of the cable tray tilts to the inside of the cable tray and eventually the cable breaks down An accident such as a broken wire or a short circuit may occur, and a safety accident such as a worker fall has frequently occurred.

In order to solve such a problem of the conventional cable tray, Korean Patent Registration No. 10-0816295 discloses a cable tray to which a rung is coupled using an engagement shape of a rung itself. However, when the cable tray is manufactured, if the manufacturing error occurs in the engagement shape, the engagement is not tightened and the rung can be more easily separated than the conventional cable tray. The cable tray is often installed on the ceiling of a building where electrical equipment such as a generator is installed, so that the cable tray often vibrates. When a runway of a cable tray is coupled using a bolt connection, the bolt may be loosened due to such vibration. When the rung is engaged using the engagement shape of the rung itself, the vibration of the cable tray The cable tray may be damaged, and the life of the cable may be shortened due to damage of the cable covering due to the vibration.

It is possible to greatly improve the coupling force of the lateral coupling side of the cable tray having a weaker coupling force than the longitudinal coupling of the cable tray due to the difference in coupling surface area of the cable tray, And to provide a cable tray having high performance. The present invention is not limited to the above-described technical problems, and another technical problem may be derived from the following description.

A cable tray according to the present invention includes: a plurality of side rails each formed in a rectangular plate shape having a plurality of grid holes per side at both side ends in the longitudinal direction and arranged side by side in two rows; Each of which is formed in a rectangular plate shape having a plurality of grid links protruded on the outer surface thereof, and which are arranged in parallel to each other in such a manner that the plurality of grid links protrude through a plurality of grid holes of the two side rails, A plurality of connectors simultaneously adhering to the inner surface; A plurality of locking bars formed in the form of a fork having a plurality of blades, each of the blades successively being press-fitted into two grid links arranged in an up-and-down direction among the plurality of protruding grid links; A plurality of rungs whose both ends are coupled to the inner surfaces of the two side rails opposite to each other by including two fastening boxes each of which is attached to and joined to the inner surface of two side rails opposed to each other; And a plurality of bolts each coupling the plurality of rungs to the plurality of side rails by engaging the respective fastening boxes with the respective side rails.

A nut hole is formed in each of the outer side wall exposed on one side of both ends of the rung and the inner side wall positioned on the inner side of the rung opposite to the outer side wall of the four side walls of the fastening box, And the inner side wall is deformed into a shape bent toward the outer side wall around the nut hole, so that the inner side wall is deformed into the nut hole of the inner side wall, Are more strongly pressed and engaged than the nut holes of the bolts and the outer wall.

The screw hole of the inner side wall is deformed into a shape closer to the outer side wall side toward the longitudinal center line side of the rung by the tightening engagement so that the engaging force between the bolts and the inner side wall The component in the direction opposite to the direction of departure of each bolt can be improved as compared with other components. A restoring force is generated in the inner side wall to restore the inner side wall in a direction opposite to the direction in which the inner side wall is bent by the elasticity of the inner side wall and a deformation force generated in the inner side wall by the tightening engagement, The vibrations of the bolts and the vibration of the inner wall due to the lateral vibration of the cable tray can be reduced.

Wherein each of the rungs comprises a first fastening box attached to the inner surface of each side rail of the first row of the two rows, a second fastening box attached to the inner surface of each side rail of the second row of the two rows, Wherein the first fastening box and the second fastening box are inserted and coupled to the opening, and wherein the first fastening box and the second fastening box are inserted and coupled to both side openings of the C-shaped steel, The direction in which the inner wall of the fastening box is bent toward the outer wall of the first fastening box and the direction in which the inner wall of the second fastening box is bent toward the outer wall of the second fastening box are opposite to each other on the straight line corresponding to the lateral direction of the cable tray You can head.

Wherein each fastening box comprises a rectangular plate-shaped middle plate portion, an upper plate portion extending upward from the middle plate portion, a lower plate portion extending downward from the middle plate portion, a left plate portion extending leftward from the middle plate portion, And the flexibility of the bending portion of each fastening box generated by integrally forming the fastening boxes is determined by the vibration of each bolt and the vibration of the inner wall The vibration of each bolt reduced by the deformation force and the restoring force and the vibration of the inner wall can be further reduced.

Each of the lock bars is formed in the form of a fork having a rectangular plate bent so as to be able to be seated on the upper or lower edge of each side rail having the shape of a cross section and a plurality of blades projecting from one side of the bent square plate And the rectangular plate portion of each of the lock bars is bent toward the outer side of each of the side rails so that the longitudinal direction of the cross section of the rectangular plate portion and the longitudinal direction of the cross section of the plurality of blades fall within a range of 3 degrees to 12 degrees Wherein each of the blades is press-fitted into two grid links sequentially arranged in the upper and lower rows so that when the respective lock bars are seated on the upper or lower edges of the two side rails opposed to each other, As the folded rectangular plate portion is spread by the outer surface of the rail, The lock bar may be pressed against the outer surface of the two side rails to each other in the butt.

Wherein a plurality of latching holes are formed on upper and lower sides of a plurality of grid holes on both side ends of the side rails, and a plurality of upper latching holes of the two side rails opposed to each other are formed on inner surfaces of the square plate portions of the respective lock bars, Or a plurality of locking protrusions corresponding to the plurality of lower locking holes are projected and when the respective blades are downwardly press-fitted into the two grid links arranged in the upper and lower rows and the locking bars are seated on the upper edge of the respective side rails The plurality of locking projections are engaged with a plurality of upper locking holes of the two side rails opposed to each other by the compression of the lock bars and the blades are upwardly press-fitted into the two grid links arranged in the upper and lower rows, When each lock bar is seated on the lower edge of each side rail, Of the can by crimping be engaged group of the plurality of obstacle to a plurality of lower engaging hole of the two side rails to each other in the butt.

Wherein the inner side of the rectangular plate portion of each of the lock bars is provided with a copper plate of a size capable of simultaneously contacting the outer surfaces of the two side rails opposed to each other at the same time, When the lock bars are press-fitted and the lock bars are seated on the upper or lower edges of the two side rails opposed to each other, as the bent square plate portions are expanded by the outer surfaces of the two side rails opposed to each other, A copper plate attached to the inner surface of the plate portion can be pressed onto the outer surfaces of the two side rails opposed to each other.

Wherein a plurality of protrusions protruding from the center of each bolt are formed on the lower surface of the head of each of the bolts so that the bolts are fastened to the fastening boxes so that the lower surface of the head of each bolt is engaged with the respective side rails The plurality of flat protrusions and the plurality of flat grooves may be engaged with each other as the plurality of flat grooves are formed on the outer surface of each of the side rails by the plurality of flat protrusions.

A plurality of blades of each lock bar are press-fitted into a plurality of grid links of a connector protruding through a plurality of grid holes of two side rails which are in contact with each other so that a longitudinal directional coupling of the cable tray is performed and a fastening box Each of the bolts is tightly coupled to the nut hole of the outer wall of the fastening box and the nut hole of the inner wall in the cable tray in which the cable tray is laterally coupled by being attached to the inner surface of the two side rails facing each other, The nut balls of each bolt and the inner wall are more strongly pressed and engaged than the nut balls of the respective bolts and the outer wall so that the coupling force is weaker than the longitudinal coupling of the cable tray due to the difference in coupling area in the shape of the cable tray On the lateral coupling side of the cable tray The coupling force can be greatly improved, and the cable tray can be easily assembled by using only the minimum bolt coupling.

Accordingly, the vertical stress of the cable tray can be greatly improved, so that the stacking ability of the cable tray can be improved, and the safety accident caused by the widening between the side rails and the rungs can be prevented. In addition, since the combination of the side rail and the rung is based on a method in which each bolt is tightly coupled to the nut hole of the outer side wall of the fastening box and the nut hole of the inner side wall in sequence, even if a manufacturing error occurs during the manufacture of the side rail and the rung The manufacturing error has little effect on the normal stress of the cable tray.

In particular, when the cable tray vibrates due to an earthquake occurring at a place where a cable tray is installed and driving of a power device therearound, the bolt is double-engaged with the nut hole of the outer wall of the tightening box and the nut hole of the inner wall A bolt loosening phenomenon is hardly caused, so that a safety accident caused by bolt loosening can be prevented. In addition, the combination of the side rails and the rungs allows the bolts to be screwed into the nut holes of the outer wall of the fastening box and the nut holes of the inner wall It is possible to prevent breakage of the cable tray due to the vibration amplification due to such clearance and also to prolong the life of the cable .

Further, due to the tight coupling between the bolt and the inner wall of the inner wall, the threaded surface of the nut hole of the inner wall is deformed to be closer to the outer wall side toward the longitudinal center line side of the rung, As the component of the coupling force in the direction opposite to the direction of departure of each bolt is improved as compared with the component in the other direction, the bolt loosening is completely prevented even if the respective bolts are vibrated in the direction of departing due to the lateral vibration of the cable tray .

In addition, restoring force for restoring the inner wall in a direction opposite to the direction in which the inner wall is bent by the elasticity of the inner wall is generated in the inner wall, and the deformation force generated in the inner wall by the tightening of the bolt and the elasticity of the inner wall The restoring forces generated on the inner side walls are balanced with each other, and the vibration of each bolt and the vibration of the inner wall due to the lateral vibration of the cable tray are balanced, so that the fatigue accumulation of the bolt and the inner wall due to vibration of the cable tray can be mitigated So that the breakage of the bolt and the inner wall due to the vibration of the cable tray can be prevented.

Further, since the first fastening box and the second fastening box are inserted and coupled to the openings at both sides of the C-shaped steel of each rung, the inner wall of the first fastening box is bent in the direction toward the outer wall of the first fastening box, The direction of deflection of the second fastening box toward the outer wall side is opposite to that on the straight line corresponding to the lateral direction of the cable tray, so that the vibration in the lateral direction of the cable tray, the deformation and restoring force generated in the inner wall of the first fastening box, The deformation force and the restoring force generated on the inner side wall of the second fastening box and the restoring force generated on the inner side wall of the first fastening box are formed on the lateral side of the cable tray Vibration in a direction can be shared and reduced.

Each fastening box has a rectangular plate-shaped middle plate portion, an upper plate portion extending upward from the middle plate portion, a lower plate portion extending downward from the middle plate portion, a left plate portion extending leftward from the middle plate portion, And the flexibility of the bending portion of each fastening box absorbs the vibration of each bolt and the vibration of the inner side wall of each fastening box to absorb the deformation force and the restoring force generated on the inner wall The vibration of each bolt and the vibration of the inner wall can be further reduced, so that the vibration of the cable tray is hardly caused by the vibration of the bolt and the inner wall, leading to vibration reduction of the entire fastening box. The breakage of the fastening box due to this can be prevented.

The square plate portion of each lock bar is bent toward the outer surface side of each side rail so that the longitudinal direction of the cross section of the rectangular plate portion and the longitudinal direction of the cross section of the plurality of blades fall within a range of 3 to 12 degrees, When the blades are in turn pressed into the two grid links and the respective lock bars are seated on the upper or lower edge of the two side rails which are in contact with each other, the area of the rectangular plate bent by the outer surfaces of the two side rails opposed to each other is unfolded As the rock bars are pressed against the outer surfaces of the two side rails which are in contact with each other, the longitudinal coupling of the cable trays can be kept strong even when the cable trays are vibrated without the influence of manufacturing errors. Accidents can be prevented.

In addition, when the rectangular plate portions of the respective lock bars are bent and the lock bars are seated on the upper or lower edge of the two side rails which are in contact with each other, when the lock bars are pressed against the outer surfaces of the two side rails opposed to each other, Even when a plurality of locking projections are engaged with the plurality of locking projections from the inner surface of each lock bar or a plurality of locking projections are engaged with the plurality of lower locking projections by a plurality of upper locking holes of the two side rails which face each other, Engagement of the plurality of engagement holes of the side rails and the plurality of engagement recess periods of the respective lock bars can be maintained and separation of the side rails due to disengagement of the lock bars can be prevented.

A copper plate of a size capable of simultaneously contacting the outer surfaces of the two side rails which are in contact with each other is attached to the inner surface of the rectangular plate portion of each of the lock bars. The respective blades are pressed into the two grid links one after another, The rectangular plates bent by the outer surfaces of the two side rails opposed to each other when they are seated on the upper edge or the lower edge of the two side rails on the two side rails are unfolded so that the copper plates attached to the inner surface of the rectangular plate Even when the cable tray is vibrated by being pressed onto the outer surfaces of the four side rails, the two side rails which are in contact with each other can always be connected with excellent electrical conductivity.

A plurality of protrusions are formed on the lower surface of the head of each bolt so as to be radiated from the center of each bolt so that the bolts are fastened to the fastening boxes and the lower surface of each bolt is pressed on the outer surface of each side rail A plurality of linear grooves are formed on the outer surface of each side rail by a plurality of linear protrusions on the bottom surface of the bolt so that the plurality of linear protrusions on the lower surface of the head of the bolt are engaged with the plurality of linear grooves, It is possible to make each bolt have a strong coupling force against the vibration of the cable tray by only the shape of the bottom surface of each bolt without machining.

1 is a perspective view of a cable tray according to an embodiment of the present invention.
2 is a perspective view of the side rail 10 shown in Fig.
3 is a perspective view of the connector 20 shown in Fig.
4 is a view showing a process of fitting the connector 20 shown in Fig. 3 to the side rail 10 shown in Fig.
5 is a perspective view and a side view of the lock bar 30 shown in Fig.
Fig. 6 is a view showing another embodiment of the lock bar 30 shown in Fig.
7 is a view illustrating a process in which the blades 31 of the lock bar 30 shown in FIG. 5 are pressed downward.
8 is a perspective view of the rung 40 shown in Fig.
FIG. 9 is a view showing a state in which the rung 40 shown in FIG. 8 is coupled to the side rail 10 shown in FIG.
10 is an exploded view and a perspective view of the fastening box 41 shown in Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following embodiments will be described in order to protect and support a flexible elongated object such as an electric cable such as a power cable, a communication cable, a hydraulic tube, a pneumatic tube, or the like, To a cable tray used. Various cables as described above are loaded inside the cable tray according to the following embodiments. Hereinafter, referring to the drawings, the vertical, left and right directions of the respective members constituting the cable tray are determined based on the position of the cable tray installed so that the cable can be loaded, and the cable tray is configured based on the inside and the outside of the cable tray The inside and the outside of each member to be determined.

1 is a perspective view of a cable tray according to an embodiment of the present invention. 1, a cable tray according to the present embodiment includes a plurality of side rails 10, a plurality of connectors 20, a plurality of lock bars 30, a plurality of rungs 40, And a plurality of bolts (50). Most parts such as a plurality of side rails 10, a plurality of connectors 20, a plurality of lock bars 30 and a plurality of rungs 40 can be made of a hot-dip galvanized steel sheet and a plurality of bolts 50 Some parts may be made of stainless steel. In the high humidity environment inside the building, the corrosion resistance of the cut surfaces of the parts should be very good. To this end, the above-mentioned components are made of zinc (Zn), magnesium (Mg) It can be made of an alloy gold-plated steel sheet.

Since the length and the route of the cables installed inside the building are not constant, the cable tray is produced by being divided into unit members of a predetermined size such as a plurality of side rails 10 and the like, Respectively. Cable trays must be constructed to have a rigidity that can withstand the load of cables above all. If the entire cable tray is made in the form of a flat plate, a large amount of material is consumed in making the cable tray, So that it is not preferable. Accordingly, in the present embodiment, both side walls of the cable tray are realized by a plurality of side rails 10 in the form of a rectangular plate, and the bottom is realized as a rung 40 disposed at regular intervals, whereby the rigidity Can be lightly manufactured using a minimum amount of material.

2 is a perspective view of the side rail 10 shown in Fig. Referring to FIG. 2, each of the plurality of side rails 10 has a plurality of grid holes 11, at least one fixing hole 12, and a plurality of locking holes 13 at both side ends in the longitudinal direction thereof, And has a rectangular plate shape in which a plurality of wings 14 are perforated at regular intervals at a lower end thereof. As shown in Fig. 2, each side rail 10 is a rectangular plate having a cross-sectional shape "] "", in which four rectangular lattice holes 11 are formed in a grid pattern in the middle of each side end in the longitudinal direction . One rectangular fixing hole 12 is formed on the lower side of the four rectangular grid holes 11 at both side ends of each side rail 10. Two square-shaped locking holes 13 are formed on the upper and lower sides of the four rectangular grating holes 11 at both side ends of the side rails 10, respectively. In addition, two circular protrusions 14 are formed at a lower end portion of each side rail 10 at regular intervals corresponding to one-third of the longitudinal length of the side rails 10.

As shown in FIG. 1, the plurality of side rails 10 are arranged side by side in two rows in a cable tray installation space such as a space below a ceiling of a building or the like to form both side walls of the cable tray. One of two rows is completed by arranging the half of the plurality of side rails 10 in such a manner that the two side rails 10 are arranged to be opposed to each other in the longitudinal direction and the plurality of side rails 10 ), The remaining one of the two columns is completed. Two adjacent side rails 10 may be adjacent to each other in the longitudinal direction of each side rail 10 and may be adjacent to each other in the lateral direction. The two side rails 10 adjacent to each other in the longitudinal direction are represented by two side rails 10 facing each other and the two side rails 10 adjacent to each other in the transverse direction are represented by two side rails 10, (10).

Each of the upper and lower edges of each side rail 10 is formed in a shape extending inwardly of the cable tray in a cross-sectional "L" shape. The side rails 10 belonging to any one row and the side rails 10 belonging to the other row are arranged so that the extending portions of the upper and lower corners thereof are symmetrically protruded from each other in the inner direction of the cable tray. As shown in Figs. 1-2, each of the side rails 10 in the left-hand column has a cross-section of "[" and each side rail 10 in the right-hand column has a cross- (10) and the respective side rails (10) in the right column are disposed symmetrically with respect to each other.

3 is a perspective view of the connector 20 shown in Fig. Referring to FIG. 3, each of the plurality of connectors 20 is formed in a rectangular plate shape having a plurality of grid links 21 and a plurality of fixing protrusions 22 protruded on the outer surface thereof. Each lattice link 21 of the connector 20 is formed in a half-pipe shape and protrudes on the outer surface of the connector 20, and each of the fixing protrusions 22 of the connector 20 has a cross- ] "Shape, and protrudes on the outer surface of the connector 20. As shown in Figure 3, each connector 20 is a rectangular plate having a "]" shape in cross section, with four lattices of the side rails 10 on either side of the two side rails 10, Four half-pipe shaped links 21 corresponding to the holes 11 and four half-pipe shaped links 21 corresponding to the four grid holes 11 of the other side rail 10, Respectively. A rectangular plate shape corresponding to the fixing holes 12 of the side rails 10 of any one of the two side rails 10 which are in contact with each other is formed below the eight grid links 21 on the outer surface of each connector 20 Shaped fixing projections 22 corresponding to the fixing holes 12 of the one side rail 10 and the fixing projections 22 of the other side rail 10 are formed.

Each connector 20 has a plurality of grid links 11 of respective two side rails 10 opposed to each other and a plurality of grid links 21 of each connector 20 are protruded and connected to two side rails 10 Are simultaneously brought into close contact with the inner surfaces of the two side rails (10) which are in contact with each other so that the plurality of fixing projections (22) of each connector (20) protrude through at least one fixing hole (12) As described above, one square fixing hole 12 is formed on the lower side of the four rectangular grid holes 11 of each side rail 10, and the connector 20 One rectangular fixing hole 12 may be further formed on the upper side of the four rectangular grid holes 11 of the respective side rails 10 so as to be in close contact with the inner surfaces of the two side rails 10 opposed to each other have. As shown in Fig. 1, each connector 20 has a total of eight side rails 10, which are in close contact with two side rails 10, which are in contact with each other, of the plurality of side rails 10, Eight grid links 21 of each connector 20 protrude through the grid holes 11 and through the total of two fixing holes 12 of the two side rails 10 opposed to each other, Two fixing protrusions 22 are projected.

4 is a view showing a process of fitting the connector 20 shown in Fig. 3 to the side rail 10 shown in Fig. 4 (a), after the operator crosses the two side rails 10 in the longitudinal direction, the four left side grid links 21 of the connector 20 and one left side fixing projection 22 And the four grid holes 11 of the left side rail 10 are aligned with the one fixing hole 12 and the four right grid links 21 and one right fixing projection 22 of the connector 20 are aligned with each other. And the connector 20 is brought close to the inner surface of the two side rails 10 which are in contact with each other in a state in which the positions of the four grid holes 11 of the left side rail 10 and the one fixing hole 12 are aligned with each other . 4 (b), the operator inserts the connector 20 between the upper and lower edges of the two side rails 10 and then pushes the outer surface of the connector 20 to the two side rails 10 The eight grid links 21 of the connector 20 are protruded through a total of eight grid holes 11 of the two side rails 10 which are in contact with each other.

5 is a perspective view and a side view of the lock bar 30 shown in Fig. 5 (a) is an outer perspective view of the lock bar 30 shown in Fig. 1, Fig. 5 (b) is an inner perspective view of the lock bar 30 shown in Fig. 1, 1 is a side view of the lock bar 30 shown in Fig. 5 (a), each of the plurality of lock bars 30 is formed in the form of a fork having a plurality of blades 31, so that each of the blades 31 has a plurality of side rails 10 Are sequentially press-fitted into the two grid links 21 arranged in the upper and lower rows among a plurality of grid links 21 protruding from the grid holes 11. As a result, the two side rails 10 opposed to each other are engaged. Particularly, the lock bar 30 serves to lock the coupling between the two side rails 10 which are in contact with each other until the lock bar 30 is separated from the grid link 21 by the operator. When the two side rails 10 are coupled with each other only by press-fitting the lock bar 30 and the grid link 21, the two side rails 10 may be warped due to an external impact have. The engagement between the fixing hole 12 and the fixing protrusion 22 as described above serves to fix the linear coupling type between the two side rails 10 by preventing the warping of the coupling between the two side rails 10 .

1 shows a state in which each of the blades 31 of each lock bar 30 is press-fitted into two grid links 21 arranged in a row at the top and bottom of each connector 20, The blade 31 may be press-fitted upward into the two grid links 21 arranged in series in the upper and lower portions of the respective connectors 20. [ In order to push down the respective blades 31 of the respective lock bars 30 downward, the lock bars 30 must be hammered downward in the upper space of the lock bars 30. When the cable tray is installed very close to the ceiling of the building, it is not easy to press down the respective blades 31 of the lock bars 30 downward because there is not enough space for hitting the lock bars 30 downward. Mainly, in this case, each blade 31 of the lock bar 30 is upwardly press-fitted into the two grid links 21 arranged in the upper and lower rows of the respective connectors 20. Thus, each lock bar 30 may be downwardly pushed in until it is seated in the upper edge of the side rail 10 having a cross-sectional shape "] ", or until it is seated in the lower edge of the side rail 10 .

5 (a), each lock bar 30 has an upper edge or a lower edge of the side rail 10 so as to be seated on the upper or lower edge of the side rail 10 having a cross-sectional shape " And is formed in the form of a fork having a rectangular plate bent in an "L" shape corresponding to the "L" shape of the lower edge and a plurality of blades 31 protruding from one side of the square plate. 5 (b), when the lock bars 30 are seated on the upper or lower edge of two side rails 10 which are in contact with each other, the two side rails 10 abut against each other on the outer surface side of the two side rails 10 The rectangular plate portions of the respective rocker bars 30 to be positioned are arranged in such a manner that the longitudinal direction of the cross section of the square plate portion and the longitudinal direction of the cross sections of the plurality of blades 31 are in a range of 3 to 12 degrees, The side rails 10 are bent toward the outer surface side. Each of the blades 31 of the respective lock bars 30 is successively pressed into two grid links 21 arranged in the upper and lower rows of the respective connectors 20 so that the two side rails 10, The folded square plate portions of the respective lock bars 30 are expanded by the outer surfaces of the two side rails 10 which are in contact with each other when the upper and lower sides of the lock bars 30 are seated on the upper or lower edge of the lock bar 30, The side rails 10 are pressed against the outer surface of the side rails 10.

Manufacturing errors are almost always generated when a steel sheet is processed by various methods such as shearing, bending, casting and extruding of the steel sheet. For example, the upper and lower edges of the side rails 10 may not be folded at exactly right angles and their surfaces may be somewhat rugged. The lock bars 30 are formed such that the inner surfaces of the respective lock bars 30 have the same shape as the outer surfaces of the side rails 10, 20 may be loose or may not be smooth. The inadequate coupling between the side rails 10, the lock bars 30 and the connector 20 is caused by the occurrence of an earthquake at the place where the cable tray is installed, the driving of a power device (for example, a generator) A longitudinal coupling between the side rails 10, that is, a coupling between the two side rails 10 opposed to each other may be separated.

A conventional cable tray such as a cable tray disclosed in Korean Patent No. 10-0993138 has a structure in which the coupling between the side rails 10 can be separated by the vibration of the cable tray due to such a manufacturing error. According to the present embodiment, the rectangular plate portion of each of the lock bars 30 is formed so as to form a predetermined angle in the longitudinal direction of the transverse section of the rectangular plate portion and the longitudinal direction of the cross section of the plurality of blades 31 within the range of 3 to 12 degrees. The plurality of blades 31 of the respective lock bars 30 can be prevented from being damaged even when a manufacturing error occurs during manufacture of the side rails 10, the lock bars 30 and the connectors 20 because the side rails 10 are bent toward the outer side of the side rails 10. [ Is pressed onto the outer surface of the side rail (10). Accordingly, the longitudinal coupling of the cable tray, that is, the coupling between the side rails 10, the lock bars 30, and the connector 20 can be always kept strong even when the cable tray is vibrated without the influence of manufacturing errors, The separation of the side rails 10 due to manufacturing errors can be prevented.

If the rectangular plate portion of each of the lock bars 30 is bent so that the longitudinal direction of the cross section of the square plate portion and the longitudinal direction of the cross section of the plurality of blades 31 form an angle of less than 3 degrees, The force with which the blades 31 of the side rails 10 are pressed against the outer surface of the side rails 10 is weakened so that the separation accidents due to manufacturing errors of the side rails 10, the lock bars 30, and the connectors 20 can not be completely prevented It is not preferable. If the rectangular plate portion of each of the lock bars 30 is bent so that the longitudinal direction of the cross section of the rectangular plate portion and the longitudinal direction of the cross sections of the plurality of blades 31 form an angle of more than 12 degrees, 30 may be difficult to press the plurality of blades 31 of the connector 20 into the plurality of grid links 21 of each connector 20. The optimum angle between the longitudinal direction of the cross section of the rectangular plate portion of each lock bar 30 and the longitudinal direction of the cross section of the plurality of blades 31 varies depending on the thickness and material of the lock bars 30. [ In the case where each of the lock bars 30 is made of a steel material having a thickness of 1 mm, the rectangular plate portion of each of the lock bars 30 is positioned at a position corresponding to the longitudinal direction of the cross- The coupling force of the side rails 10, the lock bars 30, and the connector 20 and the ease of press-in of the plurality of blades 31 of the respective lock bars 30 are optimal when the longitudinal direction is bent to form an angle of 5 degrees Could know.

5 (b) and 5 (c), on the inner surface of the rectangular plate portion of each of the lock bars 30, two upper latching holes 13 or two lower latching portions 13 of two side rails 10, A copper plate 34 having a size such that two engaging projections 33 corresponding to the holes 13 protrude and can simultaneously contact the outer surfaces of the two side rails 10 opposed to each other. Two holes are formed in the copper plate 34 attached to the inner surface of the rectangular plate portion of each of the lock bars 30 so that the two locking protrusions 33 can be protruded. Each of the blades 31 of the respective lock bars 30 is downwardly press-fitted into two grid links 21 arranged in the upper and lower rows of the respective connectors 20 so that the two side rails 10, The two locking projections 33 are engaged with the two upper locking holes 13 of the two side rails 10 which are in contact with each other by the compression of the lock bars 30 as described above do.

The respective blades 31 of the respective lock bars 30 are upwardly pressed into the two grid links 21 arranged in the upper and lower rows of the respective connectors 20 so that the two lock rails 30 are engaged with the two side rails Two locking projections 33 are formed on the two lower locking holes 13 of the two side rails 10 which are opposed to each other by the compression of the lock bars 30 as described above Lt; / RTI > As a result, the engaging force between the two locking holes 13 of the two side rails 10 opposed to each other and the two locking projections 33 of the respective locking bars 30 is strengthened by the compression of the lock bars 30 Even when the cable tray is vibrated, engagement between the two locking holes 13 of the two side rails 10 which are in contact with each other and the two locking projections 33 of the respective locking bars 30 can be maintained, 30 can be prevented from being separated from the side rails 10 due to removal of the side rails 10.

Each of the blades 31 of the respective lock bars 30 is successively pressed into two grid links 21 arranged in the upper and lower rows of the respective connectors 20 so that the two side rails 10, The rectangular plate portions of the lock bars 30 are extended by the outer surfaces of the two side rails 10 which are in contact with each other when the upper and lower edges of the lock bars 30 are seated on the upper or lower edge of the rectangular plate. So that the copper plate 34 can be pressed against the outer surfaces of the two side rails 10 facing each other. The cable tray is designed to be grounded to the earth to prevent electric accidents such as electric shock. The two side rails 10 opposed to each other can be electrically connected by the copper plate 34 attached to the inner surface of the rectangular plate portion of each of the lock bars 30 so that the entire cable tray can be grounded.

According to this embodiment, the electrical connection between the two side rails 10 opposed to each other is made by the surface of the copper plate 34 attached to the inner surface of the rectangular plate portion of each lock bar 30 and the surface of each side rail 10 The electrical conductivities between the two side rails 10 opposed to each other are set so that the surface of the copper plate 34 attached to the inner surface of the rectangular plate portion of each of the lock bars 30 and the surface of each side rail 10 And the more strongly it is adhered, the better. That is, the restoring force of the rectangular plate portion of each of the lock bars 30, which is generated as the folded square plate portions of the respective lock bars 30 are expanded by the outer surfaces of the respective side rails 10, The surface of the copper plate 34 attached to the inner surface of the side rail 10 and the surface of each of the side rails 10 are pressed against each other strongly so that the two side rails 10, Can always be connected with an excellent electrical conductivity.

In a conventional cable tray such as a cable tray disclosed in Korean Patent No. 10-0993138, when the cable tray vibrates due to the occurrence of an earthquake at a place where a cable tray is installed, driving of a power device around the cable tray, There is a problem that it can be damaged. On the other hand, the cable tray may be coated with an insulating material to prevent short circuit with the electric cable, corrosion prevention, and the like. In this case, the copper plate 34 attached to the inner surface of the rectangular plate portion of each of the lock bars 30 and the outer surface portions of the side rails 10 to be pressed are not coated with insulating material for energization with the copper plate 34, And the copper plate 34 attached to the inner surface of the rectangular plate portion of each lock bar 30 is pressed against the metal surface thus exposed. Two observation holes 32 are formed in the rectangular plate portion of each of the lock bars 30 and the copper plate 34 so that the operator can check the degree of squeezing of the side rail 10 and the copper plate 34 through the observation holes 32 By observing, the electrical connection between the two side rails 10 can be confirmed.

Fig. 6 is a view showing another embodiment of the lock bar 30 shown in Fig. 6 (a) is a perspective view of the lock bar 300, which is another embodiment of the lock bar 30, and FIG. 6 (b) is a cross sectional view of the lock bar 300. FIG. 6 is compared with the lock bar 300 shown in Fig. 6 in that the lock bar 300 shown in Fig. 6 is provided on the outer surface of each blade 31 of the lock bar 30 shown in Fig. A reinforcing projection 301 having an outer peripheral surface shape identical to the inner peripheral surface shape of each lattice link 21 of the connector 20 is bonded. 3, a semi-cylindrical reinforcing projection 301 is formed on the outer surface of each blade 31 of the lock bar 30 corresponding to the half pipe shape of each lattice link 21 of the connector 20, Respectively.

When the blades 31 of the lock bars 30 are pressed into the two grid links 21 of the connector 20 by the reinforcing protrusions 301, the outer peripheral surfaces of the blades 31 of the lock bars 30 and the outer peripheral surfaces of the connectors The inner circumferential surfaces of the two grid links 21 of the side rails 10, 20 and 20 can be tightly contacted with each other, so that the bonding force of the side rails 10, the lock bars 30, and the connector 20 can be further improved. The plurality of blades 31 of the lock bars 30 are pressed against the outer surface of the side rail 10 so that the angle of the lock bars 30 A very large force may be required to press-fit the blade 31. In order to solve such a problem and to allow the side rails 10, the lock bars 30 and the connectors 20 to have a strong coupling force against the vibration of the cable tray, the reinforcing protrusions 301 of the respective blades 31 are made of an elastic material .

7 is a view showing a process in which the blades 31 of the lock bar 30 shown in FIG. 5 are pressed downward into the grid links 21 of the connector 20 shown in FIG. 7A, the worker inserts two grid holes 11 arranged in a line up and down in each of two side rails 10 which are in contact with the longitudinal direction of each blade 31 of the lock bar 30, The four blades 31 of the lock bar 30 are brought close to the eight grid links 21 of the connector 20 in a state in which the opening directions of the two grid links 21 protruded from the two grid links 21 are aligned. 7B, the operator presses the upper surface of the lock bar 30 to press the four blades 31 of the lock bar 30 into the eight grid links 21 of the connector 20. Referring to FIG. 7C, the operator presses the upper surface of the lock bar 30 continuously to seat the lock bar 30 on the upper edge of the two side rails 10 which are in contact with each other. When the lock bars 30 are seated on the upper corners of the two side rails 10 facing each other, the longitudinal coupling between the side rails 10, that is, the coupling between the two side rails facing each other is completed. The process of pushing the blades 31 of the lock bar 30 shown in FIG. 5 upward into the grid links 21 of the connector 20 shown in FIG. 3 is also the same as the downward pushing process as described above, Description thereof will be omitted.

8 is a perspective view of the rung 40 shown in Fig. Referring to FIG. 8, each of the plurality of rungs 40 has two side rails 10 opposed to each other such that the longitudinal direction thereof is perpendicular to the inner surface of the two side rails 10 opposed to each other among the plurality of side rails 10 10 and attached to the inner surfaces of the two side rails 10 whose both ends are opposed to each other to form the bottom of the cable tray. Each rung 40 includes a left fastening box 41 attached to the inner surface of each side rail 10 of the left column among the two rows of side rails 10 shown in Fig. 1, A right fastening box 41 which is attached to the inner surface and a C-shaped steel 42 to which the left fastening box 41 and the right fastening box 41 are inserted and coupled at both side openings. 8, both side lips of the open face of the C-shaped steel 42 are engaged with the engagement grooves "(") of the upper wall of the left side wall 414 and the right side wall 415 of the fastening box 41 4100 so that the left fastening box 41 and the right fastening box 41 can be inserted and engaged at both side openings of the C-shaped steel 42. [ As described above, each of the plurality of rungs 40 includes two fastening boxes 41 attached to the inner surfaces of the two side rails 10 facing each other among the plurality of side rails 10, To the inner surface of the two side rails (10).

FIG. 9 is a view showing a state in which the rung 40 shown in FIG. 8 is coupled to the side rail 10 shown in FIG. Each of the plurality of bolts 50 engages the plurality of side rails 10 with the plurality of rungs 40 by connecting the respective fastening boxes 41 to the side rails 10. As shown in FIG. 9, two bolts 50 arranged in the lateral direction of the cable tray among the plurality of bolts 50 are connected to two side rails 10 opposed to each other, And joins the plurality of side rails 10 with the plurality of rungs 40 by engaging the box 41. More specifically, two bolts (50) arranged in the lateral direction of the cable tray among the plurality of bolts (50) include a plurality of bolts (50) formed at regular intervals on the lower ends of the two side rails (10) (40) through a plurality of side rails (10) by being fastened to two fastening boxes (41) of a rung (40) through a plurality of side rails (14).

9, a plurality of protrusions are formed on the lower surface of the head of each bolt 50 so as to radiate from the center of each bolt 50. As shown in Fig. Each bolt 50 is fastened to each fastening box 41 and the lower surface of each bolt 50 is pressed against the outer surface of each side rail 10, A plurality of linear grooves are formed on the outer surface of each side rail 10 so that the plurality of linear protrusions on the lower surface of the head of each bolt 50 and the plurality of linear grooves on the outer surface of each side rail 10 are engaged with each other do. By such engaging, each of the bolts 50 is not loosened even when the cable tray is vibrated due to the above-described causes. In particular, without any machining of the outer surface of each side rail 10, each bolt 50 can have a strong coupling force against the vibration of the cable tray only by the shape of the bottom surface of each bolt 50.

10 is an exploded view and a perspective view of the fastening box 41 shown in Fig. 10 (a) is an exploded view of the fastening box 41 shown in Fig. 8, and Fig. 10 (b) is a perspective view of the fastening box 41 shown in Fig. 10 (a) shows a rectangular plate-shaped middle plate portion, an upper plate portion extending upward from the middle plate portion, a lower plate portion extending downward from the middle plate portion, a left plate portion extending leftward from the middle plate portion, A cross-shaped steel plate having a right-side plate portion is shown. Circular holes are formed at the centers of the upper plate portion and the lower plate portion of the cross-shaped steel plate, and coupling grooves 4100 of a "]" shape are formed on the end surfaces of the left plate portion and the right plate portion, respectively. Each fastening box 41 is formed by upwardly bending the upper plate portion, the lower plate portion, the left plate portion, and the right plate portion of the cross-shaped steel sheet shown in FIG. 10 (a) at right angles to be vertical to the middle plate portion.

The middle plate portion of the cross-shaped steel plate serves as a bottom wall 411 contacting the inner bottom surface of the C-shaped steel 42. The top plate portion is an outer side wall 412 exposed to the outside of one end of the C- And the left plate portion is a left side wall 414 contacting the inner left side surface of the C-shaped steel 42 and the right plate portion is an inner side wall 413 located on the inner side of both ends of the C- 42, which is in contact with the inner right side surface of the right side wall 415. An outer wall 412 exposed at one side of both ends of the rung 40 of the four side walls of each fastening box 41 and an inner wall 413 located inside the rung 40 opposite to the outer side wall 412 A nut hole 410 is formed in the center of each of the end walls 415 and 416 of the C-shaped steel 42 and the left side wall 414 contacting the inner left side surface of the C- shaped steel 42 and the right side wall 415 contacting the inner right side surface of the C- Quot;] "-shaped engagement groove 4100 is formed.

A circular hole having a size smaller than the nut hole 410 is drilled in each of the upper plate portion and the lower plate portion of the cross-shaped steel plate, and the upper plate portion, the lower plate portion, the left plate portion, and the right plate portion of the cross- A nut hole 410 may be formed in each of the outer wall 412 and the inner wall 413 of each fastening box 41 by forming a thread on the inner circumferential surface of the circular hole of each of the lower plate portions. Even if a slight difference in height occurs between the circular holes of the outer side wall 412 and the inner side wall 413 in the process of upwardly bending the upper plate portion, the lower plate portion, the left plate portion and the right plate portion of the cross-shaped steel plate, A double nut hole 410 of an outer wall 412 and an inner wall 413 which can be smoothly coupled can be formed.

The bolts 50 pass through the through holes 14 of the respective side rails 10 and are inserted into the nut holes 410 of the outer side wall 412 of the fastening box 41 and the nut holes 410 of the inner side wall 413 The inner side wall 413 is deformed to be bent toward the outer side wall 412 with the nut hole 410 as the center. The nut holes 410 of the bolts 50 and the inner wall 413 are pressed more strongly than the nut holes 410 of the bolts 50 and the outer wall 412. The threaded surface of the nut hole 410 of the inner wall 413 is twisted due to the deformation of the threaded surface of the nut hole 410 of the inner wall 413 as described above, The bolt 50 is more strongly engaged with the nut hole 410 of the inner wall 413 than the normal coupling between the bolt 50 and the nut hole 410 of the inner wall 413. Since the outer side wall 412 of each fastening box 41 is in contact with the inner surface of each side rail 10, each bolt 50 is inserted into the nut hole 410 of the outer side wall 412 of each fastening box 41, The deformation of the outer wall 412 hardly occurs. The nut holes 410 of the bolts 50 and the inner wall 413 are pressed more strongly than the nut holes 410 of the bolts 50 and the outer wall 412.

Conventional cable trays are generally manufactured by joining both ends of a rung to a side rail using only a combination of a bolt and a nut. Therefore, when a cable tray is vertically applied with an external force, a cable tray The vertical stress of the bolt was dependent only on the combination of one bolt and nut. In addition, since the cable tray must be lightly manufactured due to the premise that it can be installed on the ceiling of the building, thick steel sheets can not be applied to the side rails and rungs, and the increase of the vertical stress is limited. As a result, the vertical stress of the conventional cable tray was very weak.

Particularly, the two side rails 10 opposed to each other in the shape of the cable tray can be coupled with each other in a large area, but the two side rails 10 opposed to each other are brought into contact with each other in a narrow area, The lateral coupling of the cable tray has a weak coupling force. As a result, when a heavy cable is inserted into the cable tray or when the operator climbs up the cable tray for the extension or repair of the cable, the side rails and the rungs are easily widened so that the upper edge of the cable tray is inclined to the inside of the cable tray, There have been many reports of safety accidents.

In order to solve the problem of the conventional cable tray, Korean Patent Registration No. 10-0816295 discloses a cable tray in which a rung is coupled to a side rail using a shape of engagement of a side rail and a rung itself without using a bolt . However, when the side rail and the rung are manufactured, if the manufacturing error occurs in such an engagement shape, the engagement is not tightly performed. As a result, the vertical stress is weakened rather than the conventional cable tray which relies only on the combination of the bolt and the nut . Particularly, the above-described manufacturing error necessarily occurs at the time of manufacturing the side rail and the rung, so that a cable tray in which a rung is coupled to the side rail using the shape of engagement of the side rail and the rung itself has not been widely commercialized to be.

According to the present embodiment, the double-tight coupling between the nut hole 410 of the outer side wall 412 and the nut hole 410 of the inner side wall 413 with respect to the bolt 50 allows the coupling force The coupling force between the side rails 10 and the rungs 40 can be basically improved in addition to the coupling force of the lateral coupling side of the weak cable tray, 40 can be greatly improved. In addition, since only the minimum bolt connection is used, the cable tray can be easily assembled, so that it is possible to provide a cable tray having an excellent appearance because the external wall 412 is not deformed. As a result, the vertical stress of the cable tray can be greatly improved, so that the load capacity of the cable tray can be improved. In addition, when the operator climbs up the cable tray to expand or repair the cable, Can be prevented.

Particularly, the engagement of the side rail 10 and the rung 40 is basically the same as that of the bolt 50, except that the bolt 50 is inserted into the nut hole 410 of the outer side wall 412 of the fastening box 41 and the nut hole 410, even if a manufacturing error occurs at the time of manufacturing the side rails 10 and the rungs 40, such a manufacturing error does not substantially affect the vertical stress of the cable tray. For example, even if the joining portions of the side rails 10 and the rungs 40 are made slightly thinner or thicker than the design thickness, the bolts 50 are formed in the same way as the bolt holes 42 of the nut holes 410 and the inner walls 413 of the outer side wall 412 The vertical stress of the cable tray is not lowered due to the thickness error of the joining portion of the side rail 10 and the rung 40 because the nut can be further tightened or less tightened to the hole 410. [

In the direction of inclining the upper end of the side rail 10 to the inside of the cable tray by the load of the cable even when the cable having the weight that meets the allowable load range considered in the designing process of the cable tray is loaded in the cable tray A force for opening the side rails 10 and the rungs 40 is continuously applied. When the cable tray vibrates due to the above-described cause in a state in which the force for opening the side rails 10 and the rung 40 is continuously applied, the engagement of the both ends of the rung 40 with one bolt In the case of a conventional cable tray that relies solely on the coupling of the nut, the engagement of the bolt and the nut gradually loosens. Further, when the rung is coupled to the side rail by using the engagement shape of the side rail and the rung itself, the clearance of the engagement due to the manufacturing error further amplifies the vibration. As a result, The accumulation of the cable tray may be rapidly increased and the cable tray may be damaged, and the life of the cable may be shortened due to the damage of the cable covering due to the vibration.

According to the present embodiment, since the bolt 50 is double-engaged with the nut hole 410 of the outer side wall 412 and the nut hole 410 of the inner side wall 413, The bolt 50 is prevented from being loosened and the safety accident caused by the loosening of the bolt can be prevented. The longitudinal vibration of the cable tray has little effect on the bolt loosening but the lateral vibration of the cable tray has a decisive influence on the bolt loosening since the bolt 50 is shaken in a direction in which each bolt 50 can be disengaged. 8, the threaded surface of the nut hole 410 of the inner side wall 413 is engaged with the nut hole 410 of the inner side wall 413 by the tightening engagement between the bolt 50 and the inner side wall 413, Of the components of the engaging force of the bolts 50 and the inner wall 413 as they are deformed closer to the side of the longitudinal center line of the bolt 50 toward the side of the outer wall 412, The component in the direction opposite to the component in the other direction is improved as compared with the component in the other direction.

Accordingly, bolt loosening can be prevented completely even if the cable tray vibrates in the direction in which each bolt 50 is disengaged due to lateral vibration of the cable tray. In addition, the engagement of the side rail 10 and the rung 40 is basically the same as that in which the bolts 50 are inserted into the nut holes 410 of the outer side wall 412 of the fastening box 41 and the nut holes 414 of the inner side wall 413 The side rails 10 and the rungs 40 can not be spaced apart from each other due to a manufacturing error, so that there is little accumulation of fatigue due to vibration amplification due to such clearances. As a result, breakage of the cable tray due to vibration amplification due to clearances due to manufacturing errors between the side rails 10 and the rungs 40 can be prevented, and the service life of the cable can be extended.

8, since the fastening box 41 is generally made of steel, when the inner wall 413 is bent toward the outer wall 412 by the fastening of the bolt 50, The restoring force of the inner wall 413 to be restored in the direction opposite to the direction in which the inner wall 413 is bent is generated in the inner wall 413 due to the elasticity of the inner wall 413. The restoring force generated in the inner wall 413 by the elastic force of the inner wall 413 and the deformation force generated in the inner wall 413 by the tightening of the bolt 50 are balanced with each other, The vibration of each bolt 50 and the inner wall 413 due to the vibration of the bolt 50 can be reduced. Even if the bolt 50 is not released due to the vibration of the cable tray, the bolts 50 and the inner wall 413 continue to resist the vibration of the cable tray, so that the fatigue of the bolts 50 and the inner wall 413 accumulates The bolt 50 and the inner wall 413 may be broken. According to the present embodiment, the vibration of the bolt 50 and the inner wall 413 is reduced by the compliance of the bolt 50 and the inner wall 413 to the vibration of the cable tray, 50 and the inner side wall 413 can be relieved and the breakage of the bolt 50 and the inner side wall 413 due to the vibration of the cable tray can be prevented.

On the other hand, the left fastening box 41 and the right fastening box 41 are inserted into the openings at both sides of the C-shaped steel pipe 42 and thereby the inner side wall 413 of the left fastening box 41 is inserted into the outer side wall 41 of the right fastening box 41 And the direction in which the inner wall 413 of the left fastening box 41 is bent toward the outer wall 412 side of the right fastening box are opposite to each other on a straight line corresponding to the lateral direction of the cable tray. Accordingly, since the lateral vibration of the cable tray, the deformation force and the restoring force generated in the left inner side wall 413, and the restoring force and the restoring force generated in the right inner side wall 413 act in a straight line, And the restoring force and the restoring force generated in the right inner side wall 413 can be reduced by sharing the vibration in the lateral direction of the cable tray. As a result, the vibration of each bolt 50 and the vibration of the inner wall 413 can be further reduced.

As described above, the fastening boxes 41 are integrally formed by bending the cross-shaped steel sheet. As described above, since the fastening boxes 41 are integrally formed, the bent portions of the fastening boxes 41 are flexible. The flexibility of the bending portion of each fastening box 41 generated by integrally forming the fastening boxes 41 is absorbed by the vibration of the bolts 50 and the vibration of the inner wall 413, The vibration of each bolt 50 and the vibration of the inner wall 413 reduced by the deformation force and the restoring force generated in the inner wall 413 by the coupling can be further reduced. Accordingly, fatigue of the bolt 50 and the inner wall 413 due to vibration of the cable tray is hardly generated, so that the breakage of the bolt 50 and the inner wall 413 due to the vibration of the cable tray can be completely prevented have.

In particular, the reduction in the vibration of the bolt 50 and the inner wall 413 due to the flexibility of the bending portion of each fastening box 41 leads to the reduction of the vibration of the entire fastening box 41, Can be relieved and the breakage of the fastening box 41 due to the vibration of the cable tray can be prevented. The vibration resistance of the cable tray is basically determined by a method in which the bolts 50 are sequentially tightened to the nut holes 410 of the outer side wall 412 of the fastening box 41 and the nut holes 410 of the inner side wall 413 Therefore, even if a manufacturing error occurs at the time of manufacturing the side rail and the rung, such a manufacturing error has little effect on the seismic performance of the cable tray.

A plurality of connectors 20 protruding through a plurality of grid holes 11 of two side rails 10 with a plurality of blades 31 of the respective lock bars 30 abutting against each other And the fastening boxes 41 located at both ends of the rung 40 are attached and coupled to the inner surfaces of the two side rails 10 which are opposed to each other, Each bolt 50 is tightly coupled to the nut hole 410 of the outer side wall 412 of the fastening box 41 and the nut hole 410 of the inner side wall 413 in the cable tray in which the tray is transversely engaged The inner side wall 413 is deformed to be bent toward the outer side wall 412 so that the nut holes 410 of the bolts 50 and the inner side wall 413 are inserted into the nut holes 410 of the bolts 50 and the outer side wall 412, So that the shape of the shape of the cable tray The coupling force of the lateral coupling side of the cable tray having a weaker coupling force can be greatly improved as compared with the longitudinal coupling of the cable tray due to the difference in the sum surface area.

Particularly, when a cable tray vibrates due to an earthquake occurring at a place where a cable tray is installed and driving of a power device around the cable tray, the rectangular plate portion of each lock bar 30 is bent, It is possible to prevent the longitudinal coupling between the plurality of side rails 10 from being separated due to the longitudinal vibration of the tray and to prevent the longitudinal coupling between the outer side wall 412 and the inner side wall 413 of the fastening box 41 of each bolt 50 It is possible to prevent the bolts 50 from being loosened and broken and the breakage of the fastening box 41 due to the lateral vibration of the cable tray without being affected by the manufacturing error of the cable tray, It is possible to prevent the transverse coupling between the first and second plates from being separated. That is, in the above-described embodiment, the bolt 50 is tightly coupled to the nut hole 410 of the outer side wall 412 of the fastening box 41 and the nut hole 410 of the inner side wall 413 It is possible to provide a cable tray having an excellent seismic performance that is not affected by the manufacturing error of the cable tray.

The present invention has been described with reference to the preferred embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

10: Side rail
11: Grid ball 12: Fixed ball
13: hanging ball 14: poking
20: Connector
21: Grid link 22: Fixing projection
30, 300:
31: Blade 32: observation ball
33: stopper 34: copper plate
301: reinforcing projection
40: Rung
41: fastening box 42: C-shaped steel
410: Nut ball 4100: Coupling groove
411: bottom wall
412: outer side wall 413: inner side wall
414: left wall 415: right wall
50: Bolt

Claims

A plurality of side rails (10) formed in a rectangular plate shape in which a plurality of grid holes (11) are perforated on both side ends in the longitudinal direction, and are arranged side by side in two rows;
Each of which is formed in the shape of a rectangular plate having a plurality of grid links 21 protruding on the outer surface thereof and is connected to the plurality of grid links 21 through a plurality of grid holes 11 of two side rails 10, A plurality of connectors 20 which are simultaneously brought into close contact with the inner surfaces of the two side rails 10 which are opposed to each other so as to protrude;
Each of which is formed in the form of a fork having a plurality of blades 31 so that each of the blades 31 is press-fitted in turn into two grid links 21 arranged vertically among the plurality of protruding grid links 21 A lock bar 30;
And two fastening boxes 41 attached to the inner surfaces of the two side rails 10, which are opposed to each other, so that a plurality of rungs (not shown) coupled to the inner surfaces of the two side rails 10, 40); And
And a plurality of bolts (50) coupling the plurality of rungs (40) to the plurality of side rails (10) by engaging the respective fastening boxes (41) with the respective side rails (10)
An outer side wall 412 exposed at one side of both ends of the rung 40 among the four side walls of the fastening boxes 41 and an inner side wall 412 facing the outer side wall 412, A nut hole 410 is formed in each of the side walls 413,
The bolts 50 are inserted into the nut holes 410 of the outer side wall 412 and the nut holes 410 of the inner side wall 413 through the through holes 14 of the respective side rails 10, The inner side wall 413 is deformed to be bent toward the outer side wall 412 about the nut hole 410 so that the nut hole 410 of the bolt 50 and the inner side wall 413 is bent, (410) of the outer side wall (50) and the outer side wall (412).

The method according to claim 1,
The threaded surface of the nut hole 410 of the inner side wall 413 is deformed to be closer to the side of the outer side wall 412 toward the longitudinal center line side of the rung 40, Wherein a component of a component of an engaging force of the bolt (50) and the inner wall (413) in a direction opposite to the direction of departure of the bolt (50) is improved as compared with other components.

The method according to claim 1,
A restoring force for restoring the inner wall 413 in a direction opposite to the direction in which the inner wall 413 is bent is generated in the inner wall 413 by the elasticity of the inner wall 413, The restoring force generated in the inner side wall 413 due to the deformation force generated in the inner side wall 413 by the inner side wall 413 and the elasticity of the inner side wall 413 are balanced with each other, 50) and the vibration of the inner wall (413).

The method of claim 3,
Each of the rungs 40 includes a first fastening box 41 attached to the inner surface of each side rail 10 of the first row of the two rows, And a C-shaped steel pipe (42) having a first fastening box (41) and a second fastening box (41) inserted and coupled to both sides of the second fastening box (41)
The first fastening box and the second fastening box are inserted into the openings at both sides of the C-shaped steel pipe 42 so that the inner wall 413 of the first fastening box 41 is connected to the outer wall 412 of the first fastening box And the direction in which the inner wall 413 of the second fastening box 41 is bent toward the outer wall 412 of the second fastening box are opposite to each other on a straight line corresponding to the lateral direction of the cable tray Cable tray.

5. The method of claim 4,
Each fastening box 41 has a rectangular plate-shaped middle plate portion, an upper plate portion extending upward from the middle plate portion, a lower plate portion extending downward from the middle plate portion, a left plate portion extending leftward from the middle plate portion, Shaped steel plate having a right-side plate portion extended from the right side to the right side,
Flexibility of the bending portion of each fastening box 41 generated by integrally forming the fastening boxes 41 absorbs the vibration of the bolts 50 and the vibration of the inner wall 413, The vibration of each of the bolts (50) reduced by the restoring force and the vibration of the inner wall (413) are further reduced.

The method according to claim 1,
Each of the lock bars 30 has a rectangular plate bent so as to be able to be seated on the upper or lower edge of each side rail 10 having a cross-sectional shape "]", and a plurality of blades 30 protruding from one side of the bent square plate (31), wherein the fork-
The rectangular plate portion of each of the lock bars (30) is formed so as to form a predetermined angle in the longitudinal direction of the cross section of the square plate portion and the longitudinal direction of the cross section of the plurality of blades (31) And is bent toward the outer surface side of the housing 10,
The respective blades 31 are pressed into the two grid links 21 arranged in the upper and lower rows in order so that the respective lock bars 30 are seated on the upper or lower edges of the two side rails 31 which are in contact with each other The respective folded rectangular plates are stretched by the outer surfaces of the two side rails 10 which are in contact with each other, so that the respective lock bars 30 are pressed onto the outer surface of the side rail 10. [ cable tray.

The method according to claim 6,
A plurality of locking holes 13 are formed on the upper and lower sides of the plurality of grid holes 11 at both side ends of the side rails 10 and on the inner surfaces of the rectangular plate portions of the respective locking bars 30, A plurality of locking projections 33 corresponding to a plurality of upper locking holes 13 or a plurality of lower locking holes 13 of the two side rails 10 which are in contact with each other are protruded,
When the respective blades 31 are downwardly press-fitted into the two grid links 21 arranged in the upper and lower rows so that the respective lock bars 30 are seated on the upper corners of the respective side rails 10, , The plurality of locking projections (33) are engaged with a plurality of upper locking holes (13) of the two side rails (10) opposed to each other,
When the respective blades 31 are upwardly pressed into the two grid links 21 arranged in the upper and lower rows so that the respective lock bars 30 are seated on the lower corners of the respective side rails 10, Wherein the plurality of locking projections (33) are engaged with the plurality of lower locking holes (13) of the two side rails (10) which are opposed to each other by the compression of the locking projections (33).

The method according to claim 6,
A copper plate 34 having a size capable of simultaneously contacting the outer surfaces of the two side rails 10 facing each other is attached to the inner surface of the rectangular plate portion of each of the lock bars 30,
The respective blades 31 are pressed into the two grid links 21 arranged in the upper and lower rows in order so that the respective lock bars 30 are seated on the upper or lower edges of the two side rails 10 facing each other The bent rectangular plate portion is expanded by the outer surfaces of the two side rails 10 opposed to each other, the copper plate 34 attached to the inner surface of the extended rectangular plate portion is pressed against the two side plates Is pressed onto the outer surface of the rail (10).

The method according to claim 1,
A plurality of protrusions are formed on the lower surface of the head of each of the bolts 50 so as to radiate from the center of the bolts 50. The bolts 50 are fastened to the fastening boxes 41 As the lower surface of the head of each bolt 50 is pressed on the outer surface of each side rail 10, a plurality of flat grooves are formed on the outer surface of each of the side rails 10 by the plurality of flat projections And the plurality of straight protrusions and the plurality of straight grooves engage with each other.