Plug-in busbar

Abstract

The invention belongs to the technical field of plug busbars, particularly relates to a plug busbar, and aims to solve the problems that when a plug busbar in the prior art is externally connected with a wire, various fastening bolts need to be screwed, so that time and labor are wasted, and poor contact is easily caused by pulling, and the plug busbar comprises a busbar core plate sleeved with an insulating outer layer, a section of each wiring end of the busbar core plate is exposed, and the wiring ends of the busbar core plate are arranged to be step-shaped; wiring ends of the busbar core plate are all arranged to be zigzag-shaped warped heads, transition inclined planes are arranged between the zigzag-shaped warped heads and the busbar core plate, and U-shaped notches used for wiring are formed in the end portions of the zigzag-shaped warped heads. After an external electric wire is connected, if the external electric wire is accidentally pulled, the C-shaped clamping groove in the hinged brake bar is of a bent structure, most of pulling force can be counteracted, so that the influence on a bare wire part of a pressing part in the strip-shaped through hole is very small, and a good pulling or vibration anti-falling effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of plug-in busbars, and in particular to a plug-in busbar. Background Art

[0002] The plug-in busbar is a closed metal device composed of copper and aluminum busbar columns, which is used to distribute large power to each component of the distributed system. It has increasingly replaced wires and cables in indoor low-voltage power transmission trunk line projects; the bus duct product connector is equipped with multiple insulating plates with through holes in the middle, and a conductive sheet with a middle through hole is set on both sides of the insulating plate. The phase conductor row of each section of the bus duct product is insulated and plugged with the phase conductor row of the adjacent section of the bus duct product through the insulating plate, and then fastened with the joint bolts.

[0003] After searching, it is found that in actual operation, when external wires are connected to this type of dense plug-in busbar, bolts are usually used in combination with wire ends with metal gaskets for fixed connection, or the external wires are connected to the busbar using a soldering process. This wiring method will not only cause the bolts to loosen due to long-term low-frequency vibration and then cause poor contact, but also if the wire end is accidentally pulled, it will also cause the connection to loosen, and it is inconvenient to check and repair the line. Therefore, we propose a new wiring mechanism for the plug-in busbar that can prevent the connection from loosening due to vibration or accidental pulling. Summary of the invention

[0004] In view of the technical problem that the plug-in busbar in the prior art needs to be screwed with various fastening bolts when connecting external wires, which is time-consuming and laborious and is also prone to poor contact due to pulling, the present invention adopts the following technical solution: A plug-in busbar, comprising a busbar core plate covered with an insulating outer layer, wherein a section of the wiring terminals of the busbar core plate are exposed, and the wiring terminals of the busbar core plate are arranged in a stepped shape; and the wiring terminals of the busbar core plate are all arranged in a folded shape, a transition slope is arranged between the folded shape and the busbar core plate, and a U-shaped notch for wiring is opened at the end of the folded shape; a metal clip is slidably inserted in the U-shaped notch, and a rubber pad is fixed to the bottom of the metal clip; a vertical self-locking stud is reserved on the upper surface of the metal clip, and a shoulder-cut protrusion is reserved on the top of the self-locking stud, and a hinged gate rod is rotatably sleeved on the outer wall of the shoulder-cut protrusion, and a flat nut is screwed on the outer wall of the self-locking stud, and the flat nut is located between the upper surface of the folded shape and the hinged gate rod between; the circumferential outer wall of the self-locking stud is provided with a strip-shaped through-hole radially penetrating the self-locking stud; when wiring, the end of the external wire is peeled and inserted into the strip-shaped through-hole, and then the flat nut is screwed to tighten the external wire; an anti-slip bending hook plate is reserved at one end of the hinged gate rod close to the transition slope, and a C-shaped groove is opened in the middle of the lower surface of the anti-slip bending hook plate; a tightening spring is fixed between the lower surface of one end of the hinged gate rod away from the C-shaped groove and the rubber pad; and under the action of the tightening spring at the other end, when it is necessary to remove the external wire or check its tightness, you only need to press down the end of the hinged gate rod close to the tightening spring to lift one end of the anti-slip bending hook plate, and then loosen the flat nut to pull out the external wire.

[0005] A further configuration is that a hinge hole is opened in the middle of the upper surface of the articulated gate rod, and symmetrical ear plates are fixed on both sides of the lower surface of the articulated gate rod near the hinge hole, and horizontal axial holes on the same straight line are opened in the middle of the two ear plates, and the same articulated shaft is inserted between the two axial holes; an axis socket is opened on the side of the shoulder-cut protrusion, and the articulated shaft is rotatably connected in the axis socket, and the articulated gate rod is made of insulating material, which can avoid accidental touching of the wiring position after wiring and causing electric shock.

[0006] A further configuration is that a screw hole is provided in the middle of the clamping spring at one end of the hinged gate rod away from the C-shaped slot, and a clamping screw is screwed into the screw hole; through the provided clamping screw, after installation, the bottom end of the clamping screw can be screwed to contact the surface of the rubber pad below, at which time the external wire at the other end stuck in the C-shaped slot can be tightly pressed.

[0007] A further configuration is that the tightening screw is made of insulating material, and the thread of the tightening screw is made into a self-locking thread structure; the anti-retraction effect and tightening effect of the tightening screw can be improved.

[0008] A further configuration is that an anti-dropping plug plate is fixed to the bottom end of the metal clip, and a T-shaped slot matching the outer dimensions of the anti-dropping plug plate is opened on the upper surface of the rubber pad; the top view shape of the metal clip is engaged with the shape of the U-shaped notch, and the top end of the metal clip is lower than the plane where the upper surface of the folded head is located; after the metal clip is slidably inserted into the U-shaped notch, the whole and the rubber pad will not rotate due to the rotation of the flat nut.

[0009] A further configuration is that a spring fixing protrusion is fixed on the upper surface of the rubber pad near one end of the pressing spring, and the bottom end of the pressing spring can be sleeved and fixed on the spring fixing protrusion to prevent slipping.

[0010] A further configuration is that a spring countersunk hole is opened in the middle of one end of the clamping spring near the upper surface of the metal clamp, and a cylindrical push rod is slidably connected in the spring countersunk hole, a return spring is fixed to the bottom end of the cylindrical push rod, and an anti-slip groove is opened at the top end of the cylindrical push rod.

[0011] A further arrangement is that a T-shaped guide metal sheet with an overall horizontal T-shaped structure is inserted into the strip-shaped through hole, and two vertical guide rods are fixed to the lower surface of one end of the T-shaped guide metal sheet close to the columnar top rod, and guide holes matching the guide rods are opened on the front and rear sides of the upper surface of the metal clip close to the spring countersunk hole; the T-shaped guide metal sheet is tightly attached to the lower surface of the flat nut.

[0012] A further arrangement is that, when no external wire is inserted, the top end of the cylindrical push rod pushes the T-shaped guide metal sheet upwards until it contacts the lower surface of the flat nut, and a toggle block is reserved near the top end on the side of the cylindrical push rod away from the self-locking stud; when plugging in the external wire, the toggle block can be pressed downward first to assist in pressing down the cylindrical push rod to facilitate subsequent plugging in.

[0013] A further arrangement is that a tightening screw hole is opened at the top of the shoulder-cut protrusion, and a dust cover is sleeved on the outer wall of the top of the hinged gate rod, an anti-twist block adapted to the hinge hole is reserved in the middle of the lower surface of the dust cover, and a through hole is opened in the middle of the anti-twist block, a countersunk groove is opened at the top of the through hole at the top of the dust cover, the position and size of the through hole and the tightening screw hole are adapted, and an insulating nut is screwed in the tightening screw hole; a vertical wire hole is reserved at the end of the top of the dust cover close to the C-shaped slot.

[0014] The beneficial effects of the present invention are: 1. By setting up the anti-drop hook plate with a C-shaped slot, after the external wire is connected, if the external wire is accidentally pulled, the C-shaped slot in the hinged gate rod will offset most of the pulling force due to its bent structure, so it has little effect on the bare wire part of the compressed part in the strip perforation, so it has a good anti-drop effect due to pulling or vibration.

[0015] 2. By providing the columnar top rod and the T-shaped guide metal sheet, the exposed section of the external wire passing through the strip-shaped perforation can be tightly pressed between the anti-slip groove at the top of the columnar top rod and the lower surface of the T-shaped guide metal sheet.

[0016] 3. The dust cover can be used to prevent oil and dust from forming on the wiring part, thus ensuring the cleanliness of the wiring part and reducing corrosion damage.

[0017] 4. By providing a folding head with a certain downward inclination, the rubber pad can be tightly clamped under the U-shaped notch during use to achieve an anti-slip effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of a plug-in busbar proposed by the present invention; Figure 2 A front view of a plug-in busbar proposed by the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of a plug-in busbar proposed by the present invention with the dust cover removed; Figure 4 This is a front view of a plug-in busbar proposed by the present invention during wiring; Figure 5 This is an exploded bottom view of a dust cover in a plug-in busbar proposed by the present invention; Figure 6 A schematic diagram of the three-dimensional structure of a wiring mechanism in a plug-in busbar proposed by the present invention; Figure 7 An exploded diagram of a wiring mechanism in a plug-in busbar proposed by the present invention; Figure 8 The present invention provides an assembly diagram of a metal clamp and a columnar push rod in a plug-in busbar.

[0019] In the figure: 1, insulating outer layer; 2, external wire; 3, insulating nut; 4, dust cover; 401, sink; 402, wire hole; 403, anti-twist plug; 5, busbar core plate; 501, U-shaped notch; 502, folded head; 503, transition slope; 6, rubber pad; 601, T-shaped slot; 602, spring fixing protrusion; 7, tightening screw; 8, hinged gate rod; 801, hinged hole; 802, C-shaped card Groove; 803, hinge axis; 804, ear plate; 9, tightening spring; 10, columnar push rod; 11, metal clamp; 1101, anti-dropping plug plate; 1102, self-locking stud; 1103, strip perforation; 1104, shoulder-cut protrusion; 1105, tightening screw hole; 1106, guide hole; 1107, spring countersunk hole; 12, flat nut; 13, T-shaped guide metal sheet; 14, guide plug rod; 15, reset spring. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] In this embodiment, refer to Figure 1-8 A plug-in busbar comprises a busbar core plate 5 with an insulating outer layer 1, the wiring terminals of the busbar core plate 5 are all exposed, the wiring terminals of the busbar core plate 5 are arranged in a stepped shape, and the orthographic projection of the end of the upper busbar core plate 5 does not exceed the end of the insulating outer layer 1 sleeved on the next busbar core plate 5; and the wiring terminals of the busbar core plate 5 are all arranged in a folded head 502, a transition slope 503 is arranged between the folded head 502 and the busbar core plate 5, and a U-shaped notch 501 for wiring is opened at the end of the folded head 502; a wiring mechanism is clamped in the U-shaped notch 501, and the wiring mechanism includes a metal clamp 11 slidably inserted in the U-shaped notch 501, and a rubber pad 6 is fixed to the bottom of the metal clamp 11, the rubber pad 6 is located on the lower surface of the folded head 502 and is tightly clamped by the folded head 502 between the upper surface of the next busbar core plate 5 and the folded head 502; the metal clamp A vertical self-locking stud 1102 is reserved on the upper surface of the self-locking stud 1102, and a shoulder-cut protrusion 1104 is reserved on the top of the self-locking stud 1102. The outer wall of the shoulder-cut protrusion 1104 is rotatably sleeved with the hinged gate rod 8. The outer wall of the self-locking stud 1102 is screwed with a flat nut 12, and the flat nut 12 is located between the upper surface of the folded head 502 and the hinged gate rod 8; the circumferential outer wall of the self-locking stud 1102 is radially penetrated by the self-locking stud 1102. Strip-shaped through hole 1103; when wiring, the end of the external wire 2 is peeled and inserted into the strip-shaped through hole 1103, and then the flat nut 12 is screwed to press the external wire 2; an anti-slip hook plate is reserved at one end of the hinged gate rod 8 close to the transition slope 503, and a C-shaped slot 802 is opened in the middle of the lower surface of the anti-slip hook plate; a tightening spring 9 is fixed between the lower surface of the end of the hinged gate rod 8 away from the C-shaped slot 802 and the rubber pad 6; Specifically, by providing an anti-slip hook plate with a C-shaped slot 802, after the external wire 2 is connected, if the external wire 2 is accidentally pulled, the C-shaped slot 802 in the hinged gate rod 8 will offset most of the pulling force due to its bent structure, so it has little effect on the bare wire part of the compressed part in the strip perforation 1103, so it has a good anti-slip effect due to pulling or vibration, and with the action of the clamping spring 9 at the other end, when it is necessary to remove the external wire 2 or check its tightness, you only need to press down the end of the hinged gate rod 8 close to the clamping spring 9 to lift one end of the anti-slip hook plate, and then loosen the flat nut 12 to pull out the external wire 2.

[0022] In the present invention, a hinge hole 801 is opened in the middle of the upper surface of the articulated gate rod 8, and symmetrical ear plates 804 are fixed on both sides of the lower surface of the articulated gate rod 8 near the hinge hole 801, and horizontal axis holes on the same straight line are opened in the middle of the two ear plates 804, and the same articulated axis 803 is inserted between the two axis holes; an axis socket is opened on the side of the shoulder-cut protrusion 1104, and the articulated axis 803 is rotatably connected in the axis socket. The articulated gate rod 8 is made of insulating material, which can avoid accidental touching of the wiring position after wiring and causing electric shock.

[0023] Reference Figure 6 The end of the hinged gate rod 8 away from the C-shaped slot 802 is located in the middle of the clamping spring 9 and has a screw hole, and a clamping screw 7 is screwed into the screw hole; through the set clamping screw 7, after the installation is completed, the bottom end of the clamping screw 7 can be screwed to contact the surface of the rubber pad 6 below, and at this time, the external wire 2 with the other end stuck in the C-shaped slot 802 can be tightly pressed.

[0024] In the present invention, the abutting screw 7 is made of insulating material, and the thread of the abutting screw 7 is made into a self-locking thread structure; the anti-retraction effect and the abutting effect of the abutting screw 7 can be improved.

[0025] Reference Figure 1 and Figure 6 A anti-dropout plug plate 1101 is fixed to the bottom end of the metal clip 11, and a T-shaped slot 601 that matches the outer dimensions of the anti-dropout plug plate 1101 is opened on the upper surface of the rubber pad 6; the top view shape of the metal clip 11 is engaged with the shape of the U-shaped notch 501, and the top of the metal clip 11 is lower than the plane where the upper surface of the folded head 502 is located; after the metal clip 11 is slidably inserted into the U-shaped notch 501, the whole and the rubber pad 6 will not rotate due to the rotation of the flat nut 12.

[0026] Reference Figure 3-Figure 4 , Figure 7 A spring fixing protrusion 602 is fixed on the upper surface of the rubber pad 6 near one end of the pressing spring 9, and the end of the folded head 502 away from the transition slope 503 is inclined downward; the inserted rubber pad 6 can be pressed tightly underneath it to prevent it from slipping off, and the spring fixing protrusion 602 can be used to sleeve and fix the bottom end of the pressing spring 9 on the spring fixing protrusion 602 to prevent it from slipping off.

[0027] Reference Figure 8A spring countersunk hole 1107 is opened on the upper surface of the metal clamp 11 near the middle of one end of the clamping spring 9, and a cylindrical top rod 10 is slidably connected in the spring countersunk hole 1107, and a reset spring 15 is fixed to the bottom end of the cylindrical top rod 10, and an anti-slip groove is opened on the top of the cylindrical top rod 10; through the set cylindrical top rod 10, the exposed section of the external wire 2 passing through the strip through hole 1103 can be tightly pressed against the top of the cylindrical top rod 10 and under the flat nut 12.

[0028] Reference Figure 4 , Figure 7-Figure 8 A T-shaped guide metal sheet 13 with an overall horizontal T-shaped structure is also inserted in the strip through hole 1103, and two vertical guide rods 14 are fixed to the lower surface of one end of the T-shaped guide metal sheet 13 close to the columnar top rod 10, and guide holes 1106 matching the guide rods 14 are opened on the front and rear sides of the upper surface of the metal clip 11 close to the spring countersunk hole 1107; the T-shaped guide metal sheet 13 is tightly attached to the lower surface of the flat nut 12; the T-shaped guide metal sheet 13 can prevent the flat nut 12 from squeezing and displacing the end of the external wire 2 from the anti-slip groove when spinning.

[0029] Reference Figure 8 When the external wire 2 is not inserted, the top of the cylindrical push rod 10 pushes the T-shaped guide metal sheet 13 upward until it contacts the lower surface of the flat nut 12, and a toggle block is reserved near the top of the cylindrical push rod 10 away from the self-locking stud 1102; when plugging in the external wire 2, the toggle block can be pressed down first to assist in pressing down the cylindrical push rod 10 to facilitate later plugging.

[0030] Reference Figure 3-Figure 4 , Figure 6-Figure 8 , a tightening screw hole 1105 is provided at the top of the shoulder-cut protrusion 1104, and a dust cover 4 is sleeved on the outer wall of the top of the hinged gate rod 8, and an anti-twist plug block 403 adapted to the hinge hole 801 is reserved in the middle of the lower surface of the dust cover 4, and a through hole is provided in the middle of the anti-twist plug block 403, and a sink groove 401 is provided at the top of the through hole, and the position and size of the through hole and the tightening screw hole 1105 are adapted, and an insulating nut 3 is screwed in the tightening screw hole 1105; a vertical wire hole 402 is reserved at one end of the top of the dust cover 4 close to the C-shaped slot 802; when installing the external wire 2, first pass the end of the peeled external wire 2 through the top of the wire hole 402, and then install it in other positions through the C-shaped slot 802, so that the wiring part can be treated to prevent oil and dust, ensure the cleanliness of the wiring part, and reduce corrosion damage.

[0031] When the device is in use, first, the end of the peeled external wire 2 is passed through the top of the wire hole 402, and then the hinged gate rod 8 is pressed close to one end of the clamping spring 9. At this time, one end of the anti-slip bent hook plate is tilted, and then the exposed end of the external wire 2 bent into an L shape as a whole passes through the bottom of the C-shaped slot 802, and then inserted into the strip through-hole 1103 from the lower surface of the T-shaped guide metal sheet 13. At the same time, the toggle block is pressed downward from the other end to assist in pressing down the columnar top rod 10, and the insertion is continued until the end of the external wire 2 is inserted into the top of the anti-slip slot and the lower surface of the T-shaped guide metal sheet 13; then the flat nut 12 is screwed in reverse to tighten the inserted external wire 2; finally, the pressed hinged gate rod 8 is released, and the clamping screw 7 is screwed in to tighten; finally, the dust cover 4 is fixed in the tightening screw hole 1105 with the insulating nut 3.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A plug-in busbar, comprising a busbar core plate (5) covered with an insulating outer layer (1), wherein a portion of the connection terminals of the busbar core plate (5) are exposed, characterized in that: The connection terminals of the busbar core plate (5) are arranged in a stepped shape; and the connection terminals of the busbar core plate (5) are all arranged in a folded head (502), a transition slope (503) is arranged between the folded head (502) and the busbar core plate (5), and a U-shaped notch (501) for connection is opened at the end of the folded head (502); a metal clamp (11) is slidably inserted in the U-shaped notch (501), and a rubber pad (6) is fixed at the bottom of the metal clamp (11); a vertical self-locking stud (1102) is reserved on the upper surface of the metal clamp (11), and a cut shoulder protrusion (1104) is reserved at the top of the self-locking stud (1102), and a hinged gate rod (8) is rotatably sleeved on the outer wall of the cut shoulder protrusion (1104), and the self-locking stud (1102) is provided with a rubber pad (6) at the bottom of the metal clamp (11). ) is screwed onto the outer wall of the self-locking stud (1102), and the flat nut (12) is located between the upper surface of the folded head (502) and the hinged gate rod (8); the circumferential outer wall of the self-locking stud (1102) is provided with a strip-shaped through-hole (1103) which radially penetrates the self-locking stud (1102); when wiring, the end of the external wire (2) is peeled and inserted into the strip-shaped through-hole (1103), and then the flat nut (12) is screwed to press the external wire (2) against it; an anti-slip hook plate is reserved at one end of the hinged gate rod (8) close to the transition inclined surface (503), and a C-shaped slot (802) is provided in the middle of the lower surface of the anti-slip hook plate; a pressing spring (9) is fixed between the lower surface of the end of the hinged gate rod (8) away from the C-shaped slot (802) and the rubber pad (6).

2. A plug-in busbar according to claim 1, characterized in that: A hinge hole (801) is formed in the middle of the upper surface of the hinged gate rod (8), and symmetrical ear plates (804) are fixed to the lower surface of the hinged gate rod (8) on both sides close to the hinge hole (801), and horizontal shaft holes on the same straight line are formed in the middle of the two ear plates (804), and the same hinge shaft (803) is inserted between the two shaft holes; a shaft insertion hole is formed on the side of the shoulder-cut protrusion (1104), and the hinge shaft (803) is rotatably connected to the shaft insertion hole, and the hinged gate rod (8) is made of insulating material.

3. A plug-in busbar according to claim 1, characterized in that: One end of the hinged gate rod (8) away from the C-shaped slot (802) is provided with a screw hole in the middle of the clamping spring (9), and a clamping screw rod (7) is screwed into the screw hole.

4. A plug-in busbar according to claim 3, characterized in that: The tightening screw rod (7) is made of insulating material, and the thread of the tightening screw rod (7) is manufactured in a self-locking thread structure.

5. The plug-in busbar according to claim 1, characterized in that: The bottom end of the metal clamp (11) is fixed with an anti-dropping plug plate (1101), and the upper surface of the rubber pad (6) is provided with a T-shaped slot (601) that matches the outer dimensions of the anti-dropping plug plate (1101); the top view shape of the metal clamp (11) is engaged with the shape of the U-shaped notch (501), and the top end of the metal clamp (11) is lower than the plane where the upper surface of the folded head (502) is located.

6. A plug-in busbar according to claim 1, characterized in that: A spring fixing protrusion (602) is fixed to one end of the upper surface of the rubber pad (6) close to the pressing spring (9), and one end of the folded head (502) away from the transition slope (503) is inclined downward.

7. A plug-in busbar according to claim 1, characterized in that: A spring countersunk hole (1107) is formed on the upper surface of the metal clamp (11) near the middle of one end of the pressing spring (9), and a columnar push rod (10) is slidably connected in the spring countersunk hole (1107), a return spring (15) is fixed to the bottom end of the columnar push rod (10), and an anti-slip groove is formed on the top end of the columnar push rod (10).

8. A plug-in busbar according to claim 7, characterized in that: A T-shaped guide metal sheet (13) having an overall horizontal T-shaped structure is inserted into the strip-shaped through hole (1103), and two vertical guide rods (14) are fixed to the lower surface of one end of the T-shaped guide metal sheet (13) close to the columnar top rod (10), and guide holes (1106) matching the guide rods (14) are formed on the front and rear sides of the upper surface of the metal clamp (11) close to the spring countersunk hole (1107); the T-shaped guide metal sheet (13) is tightly attached to the lower surface of the flat nut (12).

9. A plug-in busbar according to claim 8, characterized in that: When no external wire (2) is inserted into the cylindrical push rod (10), its top end pushes the T-shaped guide metal sheet (13) upwards until it contacts the lower surface of the flat nut (12), and a toggle block is reserved near the top end on the side of the cylindrical push rod (10) away from the self-locking stud (1102).

10. A plug-in busbar according to claim 2, characterized in that: The top of the shoulder-cut protrusion (1104) is provided with a tightening screw hole (1105), and the outer wall of the top of the hinged gate rod (8) is sleeved with a dust cover (4), the middle of the lower surface of the dust cover (4) is reserved with an anti-twist plug (403) that matches the hinge hole (801), and a through hole is opened in the middle of the anti-twist plug (403), the top of the dust cover (4) is located at the top of the through hole and is provided with a recessed groove (401), the through hole and the tightening screw hole (1105) are matched in position and size, and an insulating nut (3) is screwed into the tightening screw hole (1105); a vertical wire hole (402) is reserved at one end of the top of the dust cover (4) close to the C-shaped slot (802).

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