An auxiliary construction equipment for the main control room of a substation with a rotating wire reel

Abstract

The present invention discloses an auxiliary construction equipment for a substation main control room in the technical field of auxiliary construction equipment for main control rooms, including a tool vehicle chassis. A universal wheel is provided at the bottom of the tool vehicle chassis. A cable winding disc is provided in the middle of the top of the tool vehicle chassis. A seating stool is provided at the rear end of the top of the tool vehicle chassis. A swing rod is provided at the front end of the top of the tool vehicle chassis. The auxiliary construction equipment for the substation main control room of the present invention can directly rotate the cable reel to further release the cable length when the socket is plugged in, without first cutting off the power to release the socket cable and then connecting the socket, making it more convenient to use; and the socket panel structure can control the power on and off of the socket by pressing, ensuring electrical safety. The swing rod of the auxiliary construction equipment for the substation main control room of the present invention can be flipped and adjusted to multiple intermittent angles and hover. In actual application, the height of the rod can be adjusted to be lower between the extended and folded states to pass through a passage with limited height.

Description

Technical Field

[0001] The present invention relates to the technical field of auxiliary construction equipment for main control rooms, and specifically to an auxiliary construction equipment for a substation main control room with a rotating wire reel. Background Technique

[0002] The technical transformation and overhaul project of a substation involves the secondary part project of the substation, the installation and replacement of relay protection devices, and the transformation of the integrated automation system. During the project process, it is necessary to remove or lay secondary cables. Secondary construction personnel need to remove the outer insulation layer, metal armor, inner plastic layer, and inner copper mesh grounding armor layer of the cable until the cores of the cable are exposed. At the same time, there may be network cable laying, communication time synchronization network cable laying, optical fiber laying, etc.

[0003] Therefore, during the electrical construction process in the above-mentioned substation main control room, a tool cart is required. The sockets used on existing tool carts generally use a simple reel to wind the cable. When in use, the rotation of the reel will drive the socket to rotate. Therefore, to avoid the electrical appliance cable from being wound around the socket when plugging in the socket, it is necessary to further release the cable length. Then, it is necessary to cut off the power first, release the socket cable, and then connect the socket, which is relatively troublesome to use.

[0004] In addition, to facilitate movement in the narrow aisle of the main control room and convenient storage, the handles of existing tool carts are generally directly designed as structures that can be switched between two states: extended and folded. When in use, it is either in the extended state or in the folded state. However, in actual application, it is necessary to lower the height of the pull rod between the extended and folded states to pass through a passage with limited height. At this time, the above-mentioned existing tool cart cannot achieve this.

[0005] Based on this, the present invention designs an auxiliary construction equipment for a substation main control room with a rotating wire reel to solve the above problems. Summary of the Invention

[0006] The purpose of the invention is to provide an auxiliary construction equipment for a substation main control room with a rotating wire reel to solve the above technical problems.

[0007] To achieve the above purpose, the invention provides the following technical solution: An auxiliary construction equipment for a substation main control room with a rotating wire reel, including a tool cart chassis. The bottom of the tool cart chassis is provided with universal wheels. In the middle of the top of the tool cart chassis is provided a cable winding reel. At the rear end of the top of the tool cart chassis is provided a seat stool. At the front end of the top of the tool cart chassis is provided a swingable pull rod.

[0008] The cable winding reel includes a reel outer cover. A circular hole is provided at the top of the reel outer cover and a socket panel is arranged. A number of sockets are installed in a circumferential array on the socket panel. A positioning cylinder is rotatably embedded in the center of the socket panel. A central stepped shaft is fixedly arranged at the center of the inner bottom of the reel outer cover. A cable reel is rotatably installed on the outer wall of the central stepped shaft through a bearing. The upper end of the central stepped shaft movably penetrates the inner cavity of the positioning cylinder. A limit retaining piece is arranged at the top end of the central stepped shaft and is fixed by a retaining piece bolt. A compression spring for supporting the floating of the positioning cylinder is sleeved on the outer wall of the central stepped shaft. A cable is wound on the cable reel. The plug end of the cable is led out from a wire hole on the side wall of the reel outer cover. Three conductor rings that are concentrically distributed and correspond to connect the live, neutral, and ground wires of the cable are arranged on the top surface of the cable reel. Conductor contact pins corresponding to the conductor rings are arranged at the bottom of the socket panel. An external bevel gear ring is arranged on the top surface of the cable reel outside the conductor rings. A gear shaft is rotatably installed on the outer wall of the reel outer cover through a bearing. A bevel gear meshing and driving with the external bevel gear ring is sleeved at the inner end of the gear shaft. A winding crank is arranged at the outer end of the gear shaft.

[0009] Preferably, a J-shaped limit groove is arranged on the upper end of the outer wall of the central stepped shaft, and a fixed sliding pin that is embedded in the J-shaped limit groove and can slide in the J-shaped limit groove is arranged on the inner cavity wall of the positioning cylinder.

[0010] Preferably, the circular hole at the top of the reel outer cover is connected to the socket panel through an annular flexible belt.

[0011] Preferably, the swing pull rod includes a U-shaped pull rod frame. Fork arms are provided at both ends of the U-shaped pull rod frame. Fixed toothed disks are rotatably installed at the bottom ends of the fork arms through fixed toothed disk shafts. A rotating toothed disk is meshed and arranged on the outer circumference above the fixed toothed disks. The rotating toothed disk is rotatably installed on the fork arms through a rotating toothed disk shaft. Installation plates are fixedly arranged inside the pipe ends of the U-shaped pull rod frame above the fork arms. Two sliding rods are movably penetrated through the installation plates. Upper limit plates and lower limit plates are respectively fixedly connected to the upper and lower ends of the two sliding rods. Compression springs are sleeved on the outer walls of the two sliding rods and between the installation plates and the lower limit plates. A limit tooth is fixedly arranged in the middle of the bottom surface of the lower limit plate. The limit tooth is embedded in one of the tooth gaps of the rotating toothed disk under the elastic pressing action of the compression spring. A U-shaped unlocking rod is fixedly connected between the upper limit plates at both ends of the U-shaped pull rod frame. The U-shaped unlocking rod is located inside the cavity of the U-shaped pull rod frame.

[0012] Preferably, the fixed toothed disk is semicircular, and the swingable angle of the U-shaped pull rod frame is 0-180°.

[0013] Preferably, the U-shaped tie rod frame is a hollow square tube. An unlocking opening is formed at the bottom of the horizontal section of the U-shaped tie rod frame, and the horizontal section of the U-shaped unlocking rod is exposed in the unlocking opening.

[0014] Compared with the prior art, the beneficial effects of the invention are as follows:

[0015] In the auxiliary construction equipment for the main control room of the substation of the present invention, a cable winding disc is arranged in the middle of the top of the tool vehicle chassis. The socket and the cable winding drum in the cable winding disc can rotate relative to each other to maintain power connection. When the socket is plugged in, the cable winding drum can be directly rotated to further release the cable length, without having to cut off the power first to release the socket cable and then connect the socket, which is more convenient to use; and the on-off control of the socket can be realized by pressing the socket panel structure, ensuring electrical safety.

[0016] The swing tie rod of the auxiliary construction equipment for the main control room of the substation of the present invention can be flipped and adjusted to multiple intermittent angles within the range of 0-180° and hover, and then the height of the top position of the swing tie rod changes accordingly. In addition to facilitating the towing cart and folding storage, when the auxiliary construction equipment for the main control room of the substation of the present invention is actually applied, the height of the tie rod can be adjusted to be between the extended state and the folded state to pass through a passage with limited height. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a schematic side view of the internal structure of the cable winding disc of the present invention;

[0020] Figure 3 It is a schematic top view of the cable winding disc structure of the present invention;

[0021] Figure 4 It is a schematic top view of the cable winding drum structure of the present invention;

[0022] Figure 5 It is a schematic diagram of the central stepped shaft structure of the present invention;

[0023] Figure 6 It is a schematic diagram of the internal structure of the positioning cylinder of the present invention;

[0024] Figure 7 It is a schematic front view of the swing tie rod of the present invention;

[0025] Figure 8 Schematic diagram of the lateral structure of the swing rod of the present invention;

[0026] Figure 9 Schematic diagram of the partial lateral structure of the swing rod of the present invention.

[0027] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0028] 1 - Tool vehicle chassis, 2 - Universal wheel, 3 - Cable winding reel, 31 - Reel outer cover, 32 - Socket panel, 33 - Socket, 34 - Positioning cylinder, 35 - Central stepped shaft, 36 - Cable reel, 37 - Limit retaining piece, 38 - Retaining piece bolt, 39 - Compression spring, 310 - Conductor ring, 311 - Conductor contact pin, 312 - Cable, 313 - Wire hole, 314 - Outer bevel gear ring, 315 - Gear shaft, 316 - Bevel gear, 317 - Winding crank, 318 - J-shaped limit groove, 319 - Fixed sliding pin, 320 - Annular flexible belt, 4 - Stool, 5 - Swing rod, 51 - U-shaped rod holder, 52 - Fork arm, 53 - Fixed tooth disc shaft, 54 - Fixed tooth disc, 55 - Rotating tooth disc, 56 - Rotating tooth disc shaft, 57 - Mounting plate, 58 - Slide bar, 59 - Upper limit plate, 510 - Lower limit plate, 511 - Compression spring, 512 - Limit tooth, 513 - U-shaped unlocking rod, 514 - Unlocking port. Detailed implementation manners

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the attached drawings in the embodiments of the invention. Obviously, the described embodiments are only a part of the embodiments of the invention, rather than all the embodiments. Based on the embodiments of the invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the invention.

[0030] Please refer to Figures 1-7 , the present invention provides a technical solution: an auxiliary construction device for the main control room of a substation with a rotating reel, including a tool vehicle chassis 1, universal wheels 2 are arranged at the bottom of the tool vehicle chassis 1, a cable winding reel 3 is arranged in the middle at the top of the tool vehicle chassis 1, the socket 33 and the cable reel 36 in the cable winding reel 3 can rotate relative to each other to keep energized, and when the socket 33 is plugged in, the cable reel 36 can be directly rotated to further release the cable length, without first powering off to release the socket cable and then connecting the socket, which is more convenient to use; and the structure of the socket panel 3 can control the on / off of the socket by pressing, ensuring electrical safety; a stool 4 is arranged at the rear end of the top of the tool vehicle chassis 1; and the height of the lifting seat board 43 of the stool 4 can be adjusted by turning the lifting crank 412 on the outer wall of the lifting transmission box 42, which more meets the actual squatting height requirements, and a swing rod 5 is arranged at the front end of the top of the tool vehicle chassis 1;

[0031] Specifically, the cable winding reel 3 includes a reel outer cover 31. A round hole is formed in the top of the reel outer cover 31 and a socket panel 32 is provided. The round hole in the top of the reel outer cover 31 is connected to the socket panel 32 through an annular flexible belt 320. A number of sockets 33 are circumferentially and arrayedly installed on the socket panel 32. A positioning cylinder 34 is rotationally embedded in the center of the socket panel 32. A central stepped shaft 35 is fixedly arranged at the center of the inner bottom of the reel outer cover 31. A cable reel 36 is rotationally installed on the outer wall of the central stepped shaft 35 through a bearing. The upper end of the central stepped shaft 34 movably penetrates the inner cavity of the positioning cylinder 34. A J-shaped limiting groove 318 is arranged on the upper end of the outer wall of the central stepped shaft 35. A fixed sliding pin 319 that is embedded in the J-shaped limiting groove 318 and can slide in the J-shaped limiting groove 318 is arranged on the inner cavity wall of the positioning cylinder 34. A limiting retaining plate 37 is arranged at the top end of the central stepped shaft 34 and is fixed by a retaining plate bolt 38. A compression spring 39 for supporting the floating of the positioning cylinder 34 is sleeved on the outer wall of the central stepped shaft 34. A cable 312 is wound on the cable reel 36. The plug end of the cable 312 is led out from a wire hole 313 on the side wall of the reel outer cover 31. Three conductor rings 310 that are concentrically distributed and correspondingly connect the live, neutral, and ground wires of the cable 312 are arranged on the top surface of the cable reel 36. Conductor contact pins 311 corresponding to the conductor rings 310 are arranged at the bottom of the socket panel 32. An external bevel gear ring 314 is arranged on the top surface of the cable reel 36 outside the conductor rings 310. A gear shaft 315 is rotationally installed on the outer wall of the reel outer cover 31 through a bearing. A bevel gear 316 that meshes and drives with the external bevel gear ring 314 is sleeved on the inner end of the gear shaft 315. A winding crank 317 is arranged at the outer end of the gear shaft 315;

[0032] The working principle of the cable reel 3 is as follows. After the tool vehicle moves to the corresponding working position, the outer end of the cable 312 with a plug is pulled, and the plug is connected to the wall socket for power supply. During the process of pulling the cable 312, the cable reel 36 can automatically rotate under the action of its bearings. After the cable 312 is pulled out and powered on, the socket panel 32 is pressed down, so that the conductor contact pin 311 at the bottom of the socket 33 contacts and conducts with the conductor ring 310 correspondingly. At this time, the socket 33 is in the powered-on state. To maintain the powered-on state of the socket 33, when the socket panel 32 is pressed down, the positioning cylinder 34 will be driven to descend together. The fixed sliding pin 319 in the positioning cylinder 34 slides down along the J-shaped limit groove 318. At this time, the positioning cylinder 34 is rotated by a certain angle, so that the fixed sliding pin 319 in the positioning cylinder 34 slides along the track of the J-shaped limit groove 318 to its end, and the rebound of the positioning cylinder 34 can be restricted, that is, the rebound of the socket panel 32 can be restricted, so as to maintain the powered-on state. When power-off is required, the socket panel 32 is pressed down again and the positioning cylinder 34 is rotated reversely, so that the fixed sliding pin 319 in the positioning cylinder 34 resets against the track of the J-shaped limit groove 318, and then the socket panel 32 can reset under the rebound action of the compression spring 39, so that the conductor contact pin 311 at the bottom of the socket 33 is separated from the conductor ring 310, realizing power-off. During the use process, since the socket panel 32 and the cable reel 36 can rotate relative to each other, even when the socket 33 is connected to an electrical appliance, the cable 312 can be directly pulled to change the length, which is convenient for the tool vehicle to move and work. After use, the cable can be wound and stored by rotating the winding crank 317 on the outer wall of the cable reel housing 31. Through the transmission of the bevel gear 316 and the external bevel gear ring 314, the cable reel 36 is driven to rotate, and the cable 312 is wound. A spare external hexagonal convex column is left at the outer end of the winding crank 317 for connecting an electric drill, and the cable 312 is wound quickly in an electric drive form.

[0033] Specifically, the swing rod 5 includes a U-shaped rod holder 51. Both ends of the U-shaped rod holder 51 are provided with fork arms 52. At the bottom end of the fork arm 52, a fixed gear disk 54 is rotatably installed through a fixed gear disk shaft 53. The fixed gear disk 54 is semicircular. The swingable angle of the U-shaped rod holder 51 is 0-180°. An outer circumference above the fixed gear disk 54 is meshed with a rotating gear disk 55. The rotating gear disk 55 is rotatably installed on the fork arm 52 through a rotating gear disk shaft 56. Above the fork arm 52, a mounting plate 57 is fixedly arranged inside the pipe end of the U-shaped rod holder 51. Two sliding rods 58 are movably inserted through the mounting plate 57. Upper limit plates 59 and lower limit plates 510 are fixedly connected to the upper and lower ends of the two sliding rods 58 respectively. A compression spring 511 is sleeved on the outer walls of the two sliding rods 58 and between the mounting plate 57 and the lower limit plate 510. In the middle of the bottom surface of the lower limit plate 510, a limit tooth 512 is fixedly arranged. Under the elastic pressing action of the compression spring 511, the limit tooth 512 is inserted into one of the tooth gaps of the rotating gear disk 55. A U-shaped unlocking rod 513 is fixedly connected between the upper limit plates 59 at both ends of the U-shaped rod holder 51. The U-shaped unlocking rod 513 is located inside the cavity of the U-shaped rod holder 51. The U-shaped rod holder 51 is a hollow square pipe. An unlocking opening 514 is opened at the bottom of the horizontal section of the U-shaped rod holder 51. The horizontal section of the U-shaped unlocking rod 513 is exposed in the unlocking opening 514.

[0034] The specific swing and hover working principle of the swing rod 5 is as follows: By squeezing and lifting the unlocking opening 514 position of the horizontal section of the U-shaped rod holder 51, the U-shaped unlocking rod 513 is lifted, so that the upper limit plate 59 is driven to lift through the force transmission of the U-shaped unlocking rod 513. Then, the lower limit plate 510 is driven to lift by the sliding rod 58 against the elastic force of the compression spring 511, so that the limit tooth 512 is lifted accordingly and disengaged from the tooth gap of the rotating gear disk 55. After the rotating gear disk 55 loses the limiting action of the limit tooth 512, the rotating gear disk 55 can be rotated relative to the fixed gear disk 54 to the required adjustment angle by swinging the U-shaped rod holder 51. Then, the U-shaped unlocking rod 513 is released, so that the limit tooth 512 quickly descends under the restoring elastic force of the compression spring 511 and is clamped into the corresponding tooth gap of the rotating gear disk 55 to lock the rotating gear disk 55, so as to achieve the function of hovering and fixing. When adjusting again, just repeat squeezing and lifting the U-shaped unlocking rod 513, and release it naturally after adjusting in place.

[0035] Working principle embodiment:

[0036] As Figure 1As shown, universal wheels 2 are provided at the bottom of the tool vehicle chassis 1, which facilitates movement. The universal wheels 2 are equipped with brake pedals, and the tool vehicle can be braked and fixed at a specified position through the brake pedals. In the middle of the top of the tool vehicle chassis 1, a cable reel 3 is provided for coiling electric wires. One end of the electric wire is a plug and the other end is a socket strip. When in use, the electric wire on the cable reel 3 can be released by a corresponding length, so that the plug at the end of the electric wire can be connected to the socket on the wall. The socket 33 and the cable reel 36 in the cable reel 3 can rotate relative to each other while remaining powered on. When the socket 33 is plugged in, the cable reel 36 can be directly rotated to further release the cable length, without having to cut off the power first, release the socket cable, and then connect the socket, making it more convenient to use. A seat 4 is provided at the rear end of the top of the tool vehicle chassis 1. The seat 4 can be used by construction workers to squat and sit when working under the cabinet, relieving the fatigue caused by maintaining a working posture for a long time. Moreover, the height of the lifting seat board 43 of the seat 4 can be adjusted by turning the lifting crank 412 on the outer wall of the lifting transmission box 42, which better meets the actual squatting height requirements. A swing rod 5 is provided at the front end of the top of the tool vehicle chassis 1. In actual application, the height of the rod can be adjusted to be between the extended and folded states by lowering it, so as to pass through a passage with limited height.

[0037] In the description of the invention, it should be understood that the orientation or positional relationship indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the invention.

[0038] In the invention, unless otherwise clearly specified and limited, the terms "installed", "set", "connected", "fixed", "swivelly connected", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. Unless otherwise clearly limited, for those of ordinary skill in the art, the specific meanings of the above terms in the invention can be understood according to specific situations.

[0039] Although the embodiments of the invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention. The scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An auxiliary construction equipment for the main control room of a substation with a rotating wire reel, characterized in that: It includes a tool cart chassis (1), universal wheels (2) are arranged at the bottom of the tool cart chassis (1), a cable winding disc (3) is arranged in the middle at the top of the tool cart chassis (1), a seat (4) is arranged at the rear end at the top of the tool cart chassis (1), and a swing rod (5) is arranged at the front end at the top of the tool cart chassis (1). The cable winding disc (3) includes a disc outer cover (31), a round hole is opened at the top of the disc outer cover (31) and a socket panel (32) is arranged, a plurality of sockets (33) are annularly and arrayedly installed on the socket panel (32), a positioning cylinder (34) is rotationally embedded in the center of the socket panel (32), a central stepped shaft (35) is fixedly arranged at the center of the inner bottom of the disc outer cover (31), a cable winding drum (36) is rotationally installed on the outer wall of the central stepped shaft (35) through a bearing, the upper end of the central stepped shaft (35) movably penetrates the inner cavity of the positioning cylinder (34), a limit retaining piece (37) is arranged at the top end of the central stepped shaft (35) and is fixed by a retaining piece bolt (38), a compression spring (39) for supporting the floating of the positioning cylinder (34) is sleeved on the outer wall of the central stepped shaft (35), a cable (in 312) is wound on the cable winding drum (36), the plug end of the cable (in 312) is led out from a wire hole (313) on the side wall of the disc outer cover (31), three conductor rings (310) which are concentrically distributed and correspondingly connect the live wire, neutral wire and ground wire of the cable (in 312) are arranged on the top surface of the cable winding drum (36), conductor contact pins (311) corresponding to the conductor rings (310) are arranged at the bottom of the socket panel (32), an outer bevel gear ring (314) is arranged on the top surface of the cable winding drum (36) outside the conductor rings (310), a gear shaft (315) is rotationally installed on the outer wall of the disc outer cover (31) through a bearing, a bevel gear (316) meshing and driving with the outer bevel gear ring (314) is sleeved at the inner end of the gear shaft (315), and a winding crank (317) is arranged at the outer end of the gear shaft (315). A J-shaped limit groove (318) is arranged on the upper end of the outer wall of the central stepped shaft (35), and a fixed sliding pin (319) which is embedded in the J-shaped limit groove (318) and can slide in the J-shaped limit groove (318) is arranged on the inner cavity wall of the positioning cylinder (34). The round hole at the top of the disc outer cover (31) is connected with the socket panel (32) through an annular flexible belt (320). The swing rod (5) includes a U-shaped rod holder (51). Both ends of the U-shaped rod holder (51) are provided with fork arms (52). A fixed gear disc (54) is rotatably installed at the bottom end of the fork arm (52) through a fixed gear disc shaft (53). An outer periphery above the fixed gear disc (54) is meshed with a rotating gear disc (55). The rotating gear disc (55) is rotatably installed on the fork arm (52) through a rotating gear disc shaft (56). Above the fork arm (52) and inside the pipe end of the U-shaped rod holder (51), a mounting plate (57) is fixedly arranged. Two slide rods (58) are movably inserted through the mounting plate (57). Upper limit plates (59) and lower limit plates (510) are respectively fixedly connected to the upper and lower ends of the two slide rods (58). A compression spring (511) is sleeved on the outer walls of the two slide rods (58) and between the mounting plate (57) and the lower limit plate (510). A limit tooth (512) is fixedly arranged in the middle of the bottom surface of the lower limit plate (510). Under the elastic pressing action of the compression spring (511), the limit tooth (512) is embedded in one of the tooth gaps of the rotating gear disc (55). A U-shaped unlocking rod (513) is fixedly connected between the upper limit plates (59) at both ends of the U-shaped rod holder (51). The U-shaped unlocking rod (513) is located inside the cavity of the U-shaped rod holder (51).

2. The auxiliary construction equipment for the main control room of a substation with a rotating wire reel according to claim 1, characterized in that: The fixed gear disc (54) is semicircular, and the swingable angle of the U-shaped rod holder (51) is 0-180°.

3. An auxiliary construction equipment for the main control room of a substation with a rotating wire reel, characterized in that: The U-shaped rod holder (51) is a hollow square pipe. An unlocking opening (514) is formed at the bottom of the horizontal section of the U-shaped rod holder (51). The horizontal section of the U-shaped unlocking rod (513) is exposed in the unlocking opening (514).

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