Ground wire group direct current resistance tester with wire clamp structure

Abstract

The utility model discloses a ground wire group direct current resistance tester with a wire clamp structure, which comprises a shell, the top end of the inner wall of the shell is fixedly connected with a first hollow plate, the corners of the opposite surfaces of the first hollow plate and a second hollow plate are fixedly connected with cushion blocks, and the opposite surfaces of the upper and lower groups of cushion blocks are fixedly connected with tester bodies. The top center of the tester body is fixedly connected with a display, one end of the top of the tester body is fixedly connected with a plurality of groups of twisting covers, and the other end of the top of the tester body is fixedly connected with a plurality of groups of wires; the grounding wire group direct current resistance tester is provided with the wire clamp mechanism, when the tester is used for power-off maintenance of high-voltage equipment, the wire clamp mechanism is installed at a designated position in advance, the human body cannot be harmed when the equipment is suddenly powered on and induced voltage generated by adjacent high-voltage electrified equipment, the use efficiency of the tester is improved, and the test cost is reduced. And meanwhile, the working difficulty of testers is also reduced.

Description

Technical Field

[0001] This utility model relates to the field of power testing equipment technology, and in particular to a DC resistance tester for a group of grounding wires with a clamp structure. Background Technology

[0002] The grounding wire group DC resistance tester is a specialized testing device used to measure the DC resistance value between each grounding wire in a grounding wire group. It can accurately detect the resistance value of each grounding wire in the grounding wire group, ensuring the safety and reliability of the grounding system. When using it, it should be operated in accordance with the instruction manual to ensure the accuracy of the test results and the safe use of the equipment.

[0003] Existing testing instruments cannot print out the test data of the grounding wire group DC resistance tester in real time, thus hindering the intuitive collection and analysis of the test results and affecting the instrument's usability. To address these issues, Chinese patent CN221100901U discloses a grounding wire group DC resistance tester with a built-in printer. By incorporating the tester body, printer, input tube, and output tube, the paper to be printed can be manually fed from the input tube into the printer. The printer connects to the tester body, facilitating the collection and analysis of test results and their transmission to the printer. The printed results are then conveniently output from the output tube, allowing for easy and intuitive viewing of the grounding wire group DC resistance tester's test data.

[0004] This grounding wire group DC resistance tester does not have a clamp structure. Therefore, when using this instrument to perform power outage maintenance on high-voltage equipment, the sudden power restoration of the equipment and the induced voltage generated by nearby high-voltage live equipment can easily cause harm to the human body. This not only affects the efficiency of the tester but also brings many inconveniences to the work of the testers. Utility Model Content

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A grounding wire group DC resistance tester with a wire clamp structure includes a housing. A first hollow plate is fixedly connected to the top of the inner wall of the housing, and a second hollow plate is fixedly connected to the bottom of the inner wall of the housing. Pads are fixedly connected to the corners of the opposite surfaces of the first and second hollow plates. The tester body is fixedly connected to the opposite surfaces of the upper and lower pads. A display is fixedly connected to the top center of the tester body. Multiple sets of twist caps are fixedly connected to one top end of the tester body, and multiple sets of wires are fixedly connected to the other top end of the tester body. Test rods are fixedly connected to the top ends of the wires. Multiple sets of placement mechanisms are installed on both outer walls of the housing. Each placement mechanism contains a wire clamp mechanism. The wire clamp mechanism includes a U-shaped frame, a first clamping block, and a second clamping block. The top of the concave surface of the U-shaped frame is fixedly connected to the first clamping block, and a second clamping block that can slide up and down is installed directly below the first clamping block.

[0008] As a further description of the above technical solution:

[0009] Multiple sets of sleeves pass through one side of the inner wall of the first hollow plate. One end of the outer wall of the test rod is sleeved with the inner wall of the sleeve. Threaded rings pass through the bottom corners of the second hollow plate. Support feet are threadedly connected to the inner walls of the threaded rings. Dustproof ventilation mesh passes through the front and rear ends of the outer shell.

[0010] As a further description of the above technical solution:

[0011] The placement mechanism includes a placement box, a sponge box, a slot, a frame, a top cover, a hollow cover plate, a slide groove, a hollow ring, a first slide rod, a first return spring, a locking block, a pinching piece, a sponge pad, a wire conduit, an insulated wire, and a cover. Multiple sets of placement boxes are fixedly connected to both outer walls of the outer shell. A sponge box is fixedly connected to the bottom of the inner wall of each placement box. Slots are provided at the top of both sides of the inner wall of each placement box. A frame is fixedly connected to the top of each placement box. A top cover is fitted onto the outer wall of each frame.

[0012] As a further description of the above technical solution:

[0013] Hollow cover plates are fitted onto the top of the inner wall of the placement box. A sliding groove is opened at the center of the top of each hollow cover plate. Hollow rings are fixedly connected to both ends of the inner wall of each hollow cover plate. A first sliding rod is slidably connected to the inner wall of each hollow ring. A first return spring is fitted onto one end of the outer wall of each first sliding rod. A locking block is fixedly connected to the opposite sides of each of the two sets of first sliding rods. One end of the outer wall of each locking block is engaged with the inner wall of the locking groove.

[0014] As a further description of the above technical solution:

[0015] Both sets of the first sliding rods have pinch plates fixedly connected to their opposite faces. The outer walls of the pinch plates are slidably connected to both ends of the inner wall of the sliding groove. The bottom of the hollow cover plate is fixedly connected to a sponge pad. The bottom of the placement box is fixedly connected to a conduit. One end of the inner wall of the conduit is fitted with an insulated wire, and the other end of the inner wall of the conduit is threaded with a cover.

[0016] As a further description of the above technical solution:

[0017] The clamping mechanism further includes a U-shaped guide rod, a hollow block, a threaded rod, a first rotating shaft, a shaft body, a second rotating shaft, a U-shaped limiting rod, a hollow tube, an insert block, a second sliding rod, a second return spring, and a pull rod. The top of the inner wall of the sponge box is sleeved with the outer wall of the U-shaped frame. The bottom two ends of the U-shaped frame are fixedly connected to the U-shaped guide rod. A hollow block passes through the center of the bottom of the U-shaped frame. A threaded rod passes vertically through the center of the top of each hollow block. The top of each threaded rod is rotatably connected to the first rotating shaft. The top of the first rotating shaft is fixedly connected to the center of the bottom of the second clamping block. The bottom of each threaded rod is fixedly connected to the shaft body. The bottom of each shaft body is rotatably connected to the second rotating shaft. The bottom of each second rotating shaft is fixedly connected to the U-shaped limiting rod. Gear grooves are provided on both sides of the front end of the U-shaped limiting rod.

[0018] As a further description of the above technical solution:

[0019] Hollow tubes penetrate both sides of the front end of the U-shaped frame. Insert blocks are slidably connected to the bottom of the inner wall of each hollow tube. The bottom of the outer wall of each insert block engages with the inner wall of the toothed groove at the front end of the U-shaped limiting rod. A second sliding rod is fixedly connected to the top of each insert block. A second return spring is sleeved on the bottom of the outer wall of each second sliding rod. A pull rod is fixedly connected to the top of the second sliding rod.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] (1) The grounding wire group DC resistance tester has a clamp mechanism. When using this instrument to shut down and repair high-voltage equipment, the clamp mechanism can be installed in the designated position in advance. The sudden power supply to the equipment and the induced voltage generated by the nearby high-voltage equipment will not cause harm to the human body. This not only improves the efficiency of the tester, but also reduces the difficulty of the tester's work.

[0022] (2) When the threaded rod rotates, the threaded rod can move up and down on the inner wall of the threaded hole inside the hollow block. When the threaded rod moves upward, the distance between the second clamping block and the first clamping block will gradually approach. When the threaded rod moves downward, the distance between the second clamping block and the first clamping block will gradually move away. It not only clamps the cable, but also meets the clamping requirements of cables of various diameters. By setting the connection structure between the plug and the U-shaped limit rod, the position of the second clamping block can be fixed. By setting the placement mechanism, the wire clamp mechanism can be stored. At the same time, the sponge box and sponge pad in the placement mechanism protect the entire wire clamp mechanism. Attached Figure Description

[0023] Figure 1 This is one of the structural schematic diagrams of this utility model;

[0024] Figure 2 This is the second structural schematic diagram of the present invention;

[0025] Figure 3 This is a front view of the present invention;

[0026] Figure 4 This is a front sectional view of the present invention;

[0027] Figure 5 This is a front sectional view of the placement mechanism in this utility model;

[0028] Figure 6 This is a front view of the center clamp mechanism of this utility model;

[0029] Figure 7 This is a top sectional view of the hollow tube and tie rod connection structure in the wire clamp mechanism of this utility model.

[0030] The correspondence between the labels and component names in the attached figures is as follows:

[0031] 1. Outer shell; 2. First hollow plate; 3. Second hollow plate; 4. Pad; 5. Tester body; 6. Display; 7. Twisted cap; 8. Wire; 9. Test rod; 10. Sleeve; 11. Threaded ring; 12. Support foot; 13. Dustproof ventilation mesh; 14. Placement mechanism; 141. Placement box; 142. Sponge box; 143. Slot; 144. Frame; 145. Top cover; 146. Hollow cover plate; 147. Slide groove; 148. Hollow ring; 149. First slide rod; 1410. First return spring; 1411. Pad; 14 12. Pinch plate; 1413. Sponge pad; 1414. Conductor tube; 1415. Insulated conductor; 1416. Cover; 15. Wire clamp mechanism; 151. U-shaped frame; 152. U-shaped guide rod; 153. First clamping block; 154. Hollow block; 155. Threaded rod; 156. First rotating shaft; 157. Second clamping block; 158. Shaft body; 159. Second rotating shaft; 1510. U-shaped limiting rod; 1511. Hollow tube; 1512. Insert block; 1513. Second sliding rod; 1514. Second return spring; 1515. Pull rod. Detailed Implementation

[0032] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0033] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0034] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments. The present invention provides the following embodiments.

[0035] Reference Figure 1-7This utility model provides an embodiment of a DC resistance tester for grounding wires with a clamp structure, comprising a housing 1. The housing 1 has openings at both its top and bottom. A first hollow plate 2 is fixedly connected to the top of the inner wall of the housing 1, and a second hollow plate 3 is fixedly connected to the bottom of the inner wall of the housing 1. The first hollow plate 2 and the second hollow plate 3 are the same size, and both have a through square hole. Pads 4 are fixedly connected to the corners of the opposite sides of the first hollow plate 2 and the second hollow plate 3. The tester body 5 is fixedly connected to the opposite sides of the two sets of pads 4. By setting the pads 4, the tester body 5 can be fixed in the housing 1, while also creating gaps between the tester body 5 and the housing 1, the first hollow plate 2, and the second hollow plate 3, which helps the tester body 5 to dissipate heat normally. A display 6 is fixedly connected to the center of the top of the tester body 5. One end is fixedly connected to multiple sets of twist caps 7, which allow operation of the tester body 5. The other end of the top of the tester body 5 is fixedly connected to multiple sets of wires 8, and the top of each wire 8 is fixedly connected to a test rod 9. Multiple sets of sleeves 10 pass through one side of the inner wall of the first hollow plate 2, and one end of the outer wall of each test rod 9 is sleeved with the inner wall of the sleeve 10. By setting the test rod 9, it can test electrical equipment. Threaded rings 11 pass through the bottom corners of the second hollow plate 3, and support feet 12 are threadedly connected to the inner wall of each threaded ring 11. By setting the support feet 12, the entire tester can be supported and placed stably. When the support feet 12 are damaged, they can be disassembled and replaced. Dustproof ventilation nets 13 pass through the front and rear ends of the outer shell 1. By setting the dustproof ventilation nets 13, the air circulation inside and outside the outer shell 1 can be smoother, which helps to quickly dissipate the heat generated by the tester body 5 inside the outer shell 1.

[0036] Multiple sets of storage boxes 141 are fixedly connected to both outer walls of the outer casing 1. Each storage box 141 has an opening on its top surface. A sponge box 142 is fixedly connected to the bottom of the inner wall of each storage box 141. Slots 143 are provided at the top of both sides of the inner wall of each storage box 141. A frame 144 is fixedly connected to the top of each storage box 141. A top cover 145 is fitted onto the outer wall of each frame 144. The top cover 145 improves the security of items stored inside the storage box 141. A hollow cover plate 146 is fitted onto the top of the inner wall of each storage box 141. A square cavity penetrating both outer walls is formed in the hollow cover plate 146. A sliding groove 147 is provided at the center of the top of each hollow cover plate 146. The internal space of 147 communicates with the internal space of the square cavity in the hollow cover plate 146. Hollow rings 148 are fixedly connected to both ends of the inner wall of the hollow cover plate 146. The hollow rings 148 are installed in the square cavity. First slide rods 149 are slidably connected to the inner walls of the hollow rings 148. First return springs 1410 are sleeved on one end of the outer wall of each first slide rod 149. The first return springs 1410 are located on opposite sides of the two sets of hollow rings 148. Locking blocks 1411 are fixedly connected to the opposite sides of the two sets of first slide rods 149. The outer wall of the locking block 1411 can slide or extend from both ends of the inner wall of the square cavity in the hollow cover plate 146. The end of the locking block 1411 extending out of the square cavity is connected to a locking groove. The hollow cover plate 146 can be fixed in the placement box 141 by setting a connection structure between the locking block 1411 and the locking groove 143. Pinch pieces 1412 are fixedly connected to the opposite faces of the two sets of first sliding rods 149. The outer walls of the pinch pieces 1412 are slidably connected to both ends of the inner wall of the sliding groove 147. When the two sets of pinch pieces 1412 are slid in opposite directions simultaneously, the locking block 1411 will disengage from the locking groove 143, and the hollow cover plate 146 can then be disassembled. When the operator's fingers are removed from the two sets of pinch pieces 1412, the first return spring 1410 will push the locking block 1411 out of the square cavity inside the hollow cover plate 146. A sponge pad 1413 is fixedly connected to the bottom of each of the 146 boxes. A wire conduit 1414 is fixedly connected to the bottom of the placement box 141. An insulated wire 1415 is sleeved on one end of the inner wall of the wire conduit 1414. A cover 1416 is threaded to the other end of the inner wall of the wire conduit 1414. By setting up the placement box 141, sponge box 142, slot 143, frame 144, top cover 145, hollow cover plate 146, slide groove 147, hollow ring 148, first slide rod 149, first return spring 1410, locking block 1411, pinch piece 1412, sponge pad 1413, wire conduit 1414, insulated wire 1415 and cover 1416, the placement mechanism 14 can be formed.

[0037] A U-shaped frame 151 is fitted onto the top of the inner wall of the sponge box 142. U-shaped guide rods 152 are fixedly connected to both ends of the bottom of the U-shaped frame 151. First clamping blocks 153 are fixedly connected to the top of the concave surface of the U-shaped frame 151. A hollow block 154 passes through the center of the bottom of the U-shaped frame 151. A threaded hole is formed at the center of the top of the hollow block 154. Square through holes are formed at both ends of the top of the hollow block 154. A threaded rod 155 is vertically inserted through the center of the top of each hollow block 154. The outer wall of the threaded rod 155 is installed in the threaded hole inside the hollow block 154, and the outer wall of the threaded rod 155 is threadedly connected to the inner wall of the threaded hole inside the hollow block 154. When the threaded rod 155 rotates, it can move up and down along the inner wall of the threaded hole inside the hollow block 154. A first rotating shaft 156 is rotatably connected to the top of each threaded rod 155. The top of the first rotating shaft 156 is fixedly connected to a second clamping block 157. The first clamping block 153 is located directly above the second clamping block 157. When the threaded rod 155 moves upward, the distance between the second clamping block 157 and the first clamping block 153 will gradually approach. When the threaded rod 155 moves downward, the distance between the second clamping block 157 and the first clamping block 153 will gradually move away. This not only clamps the cable but also meets the clamping requirements for cables of various diameters. The bottom of the threaded rod 155 is fixedly connected to a shaft 158. The bottom of the shaft 158 ​​is rotatably connected to a second rotating shaft 159. The bottom of the second rotating shaft 159 is fixedly connected to a U-shaped limiting rod 1510. The two ends of the outer wall of the U-shaped limiting rod 1510 are fitted into the square through holes inside the hollow block 154. The front ends of the U-shaped limiting rod 1510 are provided with toothed grooves on both sides.

[0038] Hollow tubes 1511 penetrate both sides of the front end of the U-shaped frame 151. The internal space of the hollow tubes 1511 communicates with the internal space of the square through holes inside the hollow block 154. Insert blocks 1512 are slidably connected to the bottom of the inner wall of the hollow tubes 1511. The bottom of the outer wall of one side of the insert block 1512 is set as a slope. The bottom of the outer wall of the insert block 1512 engages with the inner wall of the toothed groove at the front end of the U-shaped limiting rod 1510. By setting the connection structure between the insert block 1512 and the U-shaped limiting rod 1510, the position of the second clamping block 157 can be fixed. The top of the insert block 1512 is fixedly connected to the second slide rod 1513. The bottom of the outer wall of the second slide rod 1513 is sleeved with a second return spring 1. 514, A pull rod 1515 is fixedly connected to the top of the second slide rod 1513. By setting up a U-shaped frame 151, a U-shaped guide rod 152, a first clamping block 153, a hollow block 154, a threaded rod 155, a first rotating shaft 156, a second clamping block 157, a shaft 158, a second rotating shaft 159, a U-shaped limiting rod 1510, a hollow tube 1511, an insert block 1512, a second slide rod 1513, a second return spring 1514, and a pull rod 1515, a wire clamp mechanism 15 can be formed. By setting up a placement mechanism 14, the wire clamp mechanism 15 can be stored. At the same time, the sponge box 142 and the sponge pad 1413 in the placement mechanism 14 play a protective role for the entire wire clamp mechanism 15.

[0039] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present utility model. It should not be construed that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted by the present utility model.

Claims

1. A DC resistance tester for a group of grounding wires with a clamp structure, comprising a housing (1), characterized in that: A first hollow plate (2) is fixedly connected to the top of the inner wall of the outer shell (1), and a second hollow plate (3) is fixedly connected to the bottom of the inner wall of the outer shell (1). Pads (4) are fixedly connected to the corners of the opposite sides of the first hollow plate (2) and the second hollow plate (3). A tester body (5) is fixedly connected to the opposite sides of the upper and lower sets of pads (4). A display (6) is fixedly connected to the center of the top of the tester body (5). Multiple sets of twist caps (7) are fixedly connected to one end of the top of the tester body (5), and a display (6) is fixedly connected to the other end of the top of the tester body (5). Multiple sets of wires (8) are provided, and test rods (9) are fixedly connected to the top of each wire (8). Multiple sets of placement mechanisms (14) are installed on both sides of the outer wall of the outer casing (1). Each placement mechanism (14) contains a wire clamp mechanism (15). The wire clamp mechanism (15) includes a U-shaped frame (151), a first clamping block (153), and a second clamping block (157). The top of the concave surface of the U-shaped frame (151) is fixedly connected to the first clamping block (153). A second clamping block (157) that can slide up and down is installed directly below the first clamping block (153).

2. The DC resistance tester for grounding wire groups with a clamp structure according to claim 1, characterized in that: Multiple sets of sleeves (10) are passed through one side of the inner wall of the first hollow plate (2). One end of the outer wall of the test rod (9) is sleeved with the inner wall of the sleeve (10). Threaded rings (11) are passed through the bottom corners of the second hollow plate (3). Support feet (12) are threadedly connected to the inner wall of the threaded rings (11). Dustproof ventilation nets (13) are passed through the front and rear ends of the outer shell (1).

3. The DC resistance tester for grounding wire groups with a clamp structure according to claim 1, characterized in that: The placement mechanism (14) includes a placement box (141), a sponge box (142), a slot (143), a frame (144), a top cover (145), a hollow cover plate (146), a slide groove (147), a hollow ring (148), a first slide rod (149), a first return spring (1410), a locking block (1411), a pinch piece (1412), a sponge pad (1413), a wire tube (1414), an insulated wire (1415), and a cover (1416). Multiple sets of placement boxes (141) are fixedly connected to the outer walls on both sides of the outer shell (1). A sponge box (142) is fixedly connected to the bottom of the inner wall of the placement box (141). A slot (143) is opened at the top of both sides of the inner wall of the placement box (141). A frame (144) is fixedly connected to the top of the placement box (141). A top cover (145) is sleeved on the outer wall of the frame (144).

4. A DC resistance tester for grounding wire groups with a clamp structure according to claim 3, characterized in that: Hollow cover plates (146) are fitted onto the top of the inner wall of the placement box (141). A sliding groove (147) is provided at the center of the top of each hollow cover plate (146). Hollow rings (148) are fixedly connected to both ends of the inner wall of each hollow cover plate (146). A first sliding rod (149) is slidably connected to the inner wall of each hollow ring (148). A first return spring (1410) is fitted onto one end of the outer wall of each first sliding rod (149). A locking block (1411) is fixedly connected to the opposite sides of each of the two sets of first sliding rods (149). One end of the outer wall of each locking block (1411) is engaged with the inner wall of the locking groove (143).

5. A DC resistance tester for a group of grounding wires with a clamp structure according to claim 3, characterized in that: Both sets of the first sliding rods (149) have pinch pieces (1412) fixedly connected to their opposite sides. The outer walls of the pinch pieces (1412) are slidably connected to both ends of the inner wall of the sliding groove (147). The bottom of the hollow cover plate (146) is fixedly connected to a sponge pad (1413). The bottom of the placement box (141) is fixedly connected to a wire tube (1414). One end of the inner wall of the wire tube (1414) is fitted with an insulated wire (1415). The other end of the inner wall of the wire tube (1414) is threaded with a cover (1416).

6. A DC resistance tester for a group of grounding wires with a clamp structure according to claim 3, characterized in that: The wire clamp mechanism (15) further includes a U-shaped guide rod (152), a hollow block (154), a threaded rod (155), a first rotating shaft (156), a shaft body (158), a second rotating shaft (159), a U-shaped limiting rod (1510), a hollow tube (1511), an insert block (1512), a second sliding rod (1513), a second return spring (1514), and a pull rod (1515). The top of the inner wall of the sponge box (142) is sleeved with the outer wall of the U-shaped frame (151). The bottom two ends of the U-shaped frame (151) are fixedly connected to the U-shaped guide rod (152). A hollow tube is penetrating through the center of the bottom of the U-shaped frame (151). The hollow block (154) has a threaded rod (155) vertically penetrating its top center. The top of the threaded rod (155) is rotatably connected to a first rotating shaft (156). The top of the first rotating shaft (156) is fixedly connected to the bottom center of the second clamping block (157). The bottom of the threaded rod (155) is fixedly connected to a shaft body (158). The bottom of the shaft body (158) is rotatably connected to a second rotating shaft (159). The bottom of the second rotating shaft (159) is fixedly connected to a U-shaped limiting rod (1510). The front ends of the U-shaped limiting rod (1510) are provided with toothed grooves on both sides.

7. A DC resistance tester for a group of grounding wires with a clamp structure according to claim 6, characterized in that: Hollow tubes (1511) are inserted through both sides of the front end of the U-shaped frame (151). Insert blocks (1512) are slidably connected to the bottom of the inner wall of the hollow tubes (1511). The bottom of the outer wall of the insert blocks (1512) engages with the inner wall of the front tooth groove of the U-shaped limiting rod (1510). A second slide rod (1513) is fixedly connected to the top of each insert block (1512). A second return spring (1514) is sleeved on the bottom of the outer wall of each second slide rod (1513). A pull rod (1515) is fixedly connected to the top of the second slide rod (1513).

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