Rope gripping device

Abstract

The present invention aims to provide a rope holding device that enables tightening work from one direction without requiring work from both sides of a holding portion. A rope holding device (8) of the present invention holds a rope (1) by a first clamping member (14B, 12) and a second clamping member (14A, 13). The rope holding device (8) has a tightening plate (15) whose relative position to the first clamping member (14B, 12) is fixed and which is formed with a first threaded hole (23), and the second clamping member (14A, 13) is movably arranged between the first clamping member (14B, 12) and the tightening plate (15). A pressing bolt (18) is screwed into the first threaded hole (23) from the opposite side of the tightening plate (15) on which the second clamping member (14A, 13) is arranged, and the second clamping member (14A, 13) is pressed toward the first clamping member (14B, 12) by the pressing bolt (18).

Description

Technical Field

[0001] This invention relates to a rope gripping device. Background Technology

[0002] Patent document 1 describes a wire rope gripper that uses a pair of slotted clamping plates to clamp and hold a wire rope (see paragraph 0016). The wire rope gripper uses bolts and nuts to fasten the pair of clamping plates and clamp the wire rope, thereby gripping the wire rope.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2014-52046 Summary of the Invention

[0006] The technical problem that the invention aims to solve

[0007] The wire rope gripper described in Patent Document 1 requires the tool to contact both the bolt and nut for tightening. Therefore, sufficient working space must be ensured on both sides of the gripping portion of the wire rope.

[0008] The purpose of this invention is to provide a rope gripping device that can perform fastening operations from one direction, without requiring operations from both sides of the gripping part.

[0009] Technical means for solving technical problems

[0010] To achieve the above objectives, the rope holding device of the present invention holds a rope using a first clamping member and a second clamping member. The rope holding device includes: a fastening plate whose relative position to the first clamping member is fixed, the fastening plate having a first threaded hole; a second clamping member movably disposed between the first clamping member and the fastening plate; and a pressing bolt screwed into the first threaded hole from the side of the fastening plate opposite to the side where the second clamping member is disposed, pressing the second clamping member against the first clamping member.

[0011] Invention Effects

[0012] The rope gripping device of the present invention can tighten bolts and nuts from one direction, enabling space-saving operation.

[0013] Other technical issues, structures, and effects not mentioned above will be further clarified through the following description of the implementation methods. Attached Figure Description

[0014] Figure 1This is a schematic diagram illustrating the use of a rope holding device according to an embodiment of the present invention as part of the main rope fixing device for a construction elevator.

[0015] Figure 2 It is shown Figure 1 The diagram showing the overall structure of the rope gripping device is a side view of the device viewed from a horizontal direction.

[0016] Figure 3 Viewed from above Figure 2 A diagram (top view) of the rope gripping device shown.

[0017] Figure 4 It is shown Figure 2 A diagram (side view) showing the rope gripping state of the rope gripping device.

[0018] Figure 5 Viewed from above Figure 4 A diagram (top view) of the rope gripping device shown.

[0019] Figure 6 From Figure 2 A cross-sectional view of the fastener plate as seen in the direction illustrated. Detailed Implementation

[0020] The following describes one embodiment of the present invention with reference to the accompanying drawings.

[0021] use Figure 1 The elevator used in construction is described. Figure 1 This is a schematic diagram of a rope holding device 8 according to an embodiment of the present invention being used as part of the main rope fixing device 7 of a construction elevator.

[0022] The construction elevator includes a main rope 1, a temporary machine room 6, a car 3, a counterweight 5, and a crane 11. The temporary machine room 6 has a car side rope end 2, a traction machine 4, a main rope fixing device 7, a steering pulley 9, and a main rope drum 10. The rope holding device 8 is installed on the main rope fixing device 7.

[0023] During construction and operation, the main rope 1 starts from the car-side rope end 2, passes through the car 3, traction machine 4, and counterweight 5, and is fixed by the main rope fixing device 7 installed in the temporary machine room 6. The remaining length of the main rope 1 passes through the steering pulley 9 and is wound onto the main rope drum 10. At this time, the rope holding device 8, which is part of the main rope fixing device 7, acts as the rope end on the counterweight 5 side, thus requiring the fixed main rope 1 to be held to prevent it from slipping.

[0024] During the lifting process of the temporary machine room 6, the temporary machine room 6 is moved upward by the crane 11, extending the lifting stroke of the construction elevator. Therefore, the rope holding device 8 needs to appropriately release the grip on the main rope 1 and send the main rope 1 wound on the main rope drum 10 downward. At this time, the rope holding device 8 needs to hold the main rope 1 by a pair of clamping plates 14A, 14B (refer to...) Figure 2 Ensure an appropriate clearance between the main rope 1 and the temporary machine room 6 to allow for smooth delivery of the main rope 1. Furthermore, since the rope gripping device 8 is installed in the temporary machine room 6, the working space for gripping or releasing the main rope 1 is limited.

[0025] Clamping plates 14A and 14B are components that clamp and press the main rope 1 to hold it in place. Because clamping plates 14A and 14B have the function of clamping and holding the main rope 1, they are called "main rope clamping plates" or simply "clamping plates".

[0026] use Figure 2 and Figure 3 Description of rope gripping device 8. Figure 2 It is shown Figure 1 The diagram showing the overall structure of the rope gripping device 8 is a side view of the rope gripping device 8 viewed from a horizontal direction. Figure 3 Viewed from above Figure 2 The diagram (top view) shows the rope gripping device 8. Figure 2 and Figure 3 The diagram illustrates the rope holding device 8 during the lifting process of the temporary machine room, showing the state where the main rope 1 has been released from its grip, i.e., the released state of the main rope 1. Figure 2 In the illustration, the main rope 1 is shown in a semi-transparent manner.

[0027] More precisely, the rope holding device 8 has the function of holding the main rope 1 by clamping a pair of opposing components. Specifically, it includes a fixed plate 12, a movable plate 13, clamping plates 14A and 14B, a fastening plate 15, a guide (guide member) 16, a fastening bolt 17, a pressing bolt 18, a nut 19, and a release bolt 26. The release bolt 26 is the component used during release, and will be discussed later. Figure 4 Please provide an explanation.

[0028] The fixing plate 12 has threaded holes 20 and is fixed to the temporary machine room 6 using bolts (not shown). The rope holding device 8 is installed in the temporary machine room 6 by fixing the fixing plate 12 to the temporary machine room 6.

[0029] The movable plate 13 has a guide insertion hole 21, and a guide 16 is provided to insert into the guide insertion hole 21, thereby allowing it to move along the guide 16. Specifically, the movable plate 13, without the main rope 1, can move from... Figure 2The movable plate 13 moves along the axial direction (guide direction) 16x of the guide 16 between the fixed plate 12 and the fastening plate 15 from the state where the opposing surfaces 13b and 15a of the movable plate 13 and the fastening plate 15 are in contact until the opposing surfaces 14Aa and 14Ba of the pair of clamping plates 14A and 14B abut. The movable plate 13 also has a threaded hole (second threaded hole) 22 for engaging the release bolt 26. This threaded hole 22 is used when the movable plate 13 is pulled up by the release bolt 26 when the main rope 1 is released.

[0030] The clamping plate (second clamping plate) 14A is secured to the movable plate 13 by tightening bolts 32 into threaded holes 31 formed in the movable plate 13. The clamping plate (first clamping plate) 14B is secured to the fixed plate 12 by tightening bolts 34 into threaded holes 33 formed in the fixed plate 12. The clamping plate 14A is installed on the side of the movable plate 13 opposite to the end face 13b of the fastening plate 15 side (main rope 1 side). The clamping plate 14B is installed on the end face 12a side of the fixed plate 12 on both the fastening plate 15 and the movable plate 13 side.

[0031] The clamping plate 14A is integrally assembled onto the movable plate 13, and the clamping plate 14B is integrally assembled onto the fixed plate 12. Therefore, the clamping plate (first clamping plate) 14B and the fixed plate 12 are considered as a single component and are referred to as the "first clamping component". The clamping plate (second clamping plate) 14A and the movable plate 13 are considered as a single component and are referred to as the "second clamping component".

[0032] The first clamping members 14B and 12 include: a fixing plate 12, which is fixed to a fixing plate 15 by fastening bolts 17; and a first clamping plate 14B, which is fixed to the fixing plate 12. The second clamping members 14A and 13 include a movable plate 13 having a guide insertion hole 21 and a second clamping plate 14A fixed to the movable plate 13. The first clamping plate 14B and the second clamping plate 14A have grooves 25A and 25B that contact and clamp the main rope 1.

[0033] The second clamping members 14A and 13 are movably disposed between the first clamping members 14B and 12 and the fastening plate 15 described later.

[0034] Clamping plates 14A and 14B have grooves 25A and 25B for gripping ropes. Groove 25A is formed on the end face 14Aa of clamping plate 14A on the side opposite to the movable plate 13. Groove 25A has a deepest part 25Aa with a V-shaped cross-section and the deepest groove, and side parts 25Ab formed on both sides of the deepest part 25Aa at an inclination relative to the groove depth direction. Groove 25B is formed on the end face 14Ba of clamping plate 14B on the side opposite to the fixed plate 12. Groove 25B has a deepest part 25Ba with a V-shaped cross-section and the deepest groove, and side parts 25Bb formed on both sides of the deepest part 25Ba at an inclination relative to the groove depth direction. When the main rope 1 is clamped in the grooves 25 of the clamping plates 14A and 14B, the main rope 1 contacts the side portion 25Ab of the groove 25A and the side portion 25Bb of the groove 25B, and receives clamping force from the side portions 25Ab and 25Bb.

[0035] The fastening plate 15 is fastened to the fixing plate 12 by fastening bolts 17 via the guide member 16. The distance L0 between the fastening plate 15 and the fixing plate 12 is determined by the length of the guide member 16, and the relative position of the fastening plate 15 with respect to the first clamping members 14B and 12 is fixed. By changing the length of the guide member 16, the distance L0 between the fastening plate 15 and the fixing plate 12 can be adjusted. The guide member 16 constitutes a positioning mechanism for positioning the fastening plate 15 relative to the first clamping members 14B and 12.

[0036] To allow the fastening bolt 17 to pass through, a fastening bolt through hole 30 is provided on the fastening plate 15. When the fastening plate 15 is fastened to the fixing plate 12 by the fastening bolt 17, the position of the fastening plate 15 is fixed, so that the distance L0 between it and the fixing plate 12 is kept at a constant size by the guide 16.

[0037] The fastening plate 15 has a threaded hole (first threaded hole) 23 for pressing bolts, and the pressing bolt 18 can be tightened or screwed in by screwing the pressing bolt 18 into the threaded hole 23. The fastening plate 15 is configured to have a release bolt through hole 24, and a release bolt 26 is inserted through it.

[0038] In the state of not holding the main rope 1 (released state), as Figure 2As shown, the front end 18a of the pressing bolt 18 does not protrude from the end face 15a of the movable plate 13 side of the fastening plate 15 to the movable plate 13 side. That is, the front end 18a of the pressing bolt 18 does not abut against the end face 13b of the movable plate 13. This is so that by pushing the clamping plate 14A to the clamping plate 14B side, the clamping plates 14A and 14B do not grip or press the main rope 1 when releasing the main rope 1. However, if it is possible to maintain the state of not gripping or pressing the main rope 1, the front end 18a of the pressing bolt 18 can protrude from the end face 15a of the fastening plate 15 to the movable plate 13 side and abut against the end face 13b of the movable plate 13.

[0039] In the released state of main rope 1, such as Figure 2 As shown, preferably, the movable plate 13 is pulled into the fastening plate 15 side by releasing the bolt 26, so that the front end 18a of the pressing bolt 18 does not abut against the end face 13b of the movable plate 13, and the end face 13b of the movable plate 13 abuts against the end face 15a of the fastening plate 15. In this case, the gap L2 between the end face 13b of the movable plate 13 and the end face 15a of the fastening plate 15 is zero (L2 = 0). Thus, it is possible to reliably prevent the main rope 1 from slipping against the clamping plate 14A when the main rope 1 is in the released state.

[0040] Figure 2 and Figure 3 The diagram shows the released state of the main rope 1, where the gap between the pair of clamping plates 14A and 14B, i.e., the gap L1 between the end face 14Aa of clamping plate 14A and the end face 14Ba of clamping plate 14B, expands to La (L1 = La). In this state, the space between the two slots 25A and 25B expands, the main rope 1 is released from the clamping of the pair of clamping plates 14A and 14B, and the grip of the clamping plates 14A and 14B is in a released state.

[0041] To prevent the main rope 1 from detaching from the grooves 25A and 25B of the clamping plates 14A and 14B, La can be smaller than the diameter φ1 of the main rope 1 (La < φ1).

[0042] use Figure 4 and Figure 5 Explain the gripping state of the main rope 1. Figure 4 It is shown Figure 2 A diagram (side view) showing the rope holding state of the rope holding device 8. Figure 5 Observed from above Figure 4 A diagram (top view) showing the rope gripping device 8. Figure 4 In the diagram, the main rope 1 is shown to be semi-transparent.

[0043] The fastening plate 15 is fixed to a certain position L0 from the fixed plate 12 by fastening bolts 17 and guide members 16, and the movable plate 13 moves along the guide members 16 by tightening the pressing bolts 18. In this embodiment, guide members (guide members) 16 are provided to guide the movement of the second clamping members 14A and 13. The second clamping members 14A and 13 have guide member insertion holes 21, and the guide members 16 are provided so as to pass through the guide member insertion holes 21, thereby allowing the second clamping members 14A and 13 to move along the guide members 16.

[0044] When the main rope 1 is in the release state ( Figure 2 and Figure 3 When the main rope 1 is in the state of being pressed, the front end 18a of the pressing bolt 18 presses against the movable plate 13 by screwing the pressing bolt 18 into the pressing bolt threaded hole 23 of the fastening plate 15. That is, in this embodiment, the pressing bolt 18 is screwed into the pressing bolt threaded hole (first threaded hole) 23 from the side of the fastening plate 15 opposite to the side where the second clamping members 14A, 13 are arranged, and the second clamping members 14A, 13 are pressed against the first clamping members 14B, 12. As a result, the axial force of the pressing bolt 18 is transmitted to the clamping plate 14A via the movable plate 13, and the clamping plate 14A is pressed towards the clamping plate 14B. As a result, the main rope 1 is subjected to pressing force from the clamping plates 14A and 14B and is held by the clamping plates 14A and 14B.

[0045] Figure 4 and Figure 5 The diagram shows the gripping state of the main rope 1. In this gripping state, the interval between the pair of clamping plates 14A and 14B, i.e., the interval L1 between the end face 14Aa of clamping plate 14A and the end face 14Ba of clamping plate 14B, is Lb (L1 = Lb). This interval Lb is smaller than the interval La (Lb < La) in the released state of the main rope 1. Furthermore, the interval L2 between the end face 13b of movable plate 13 and the end face 15a of fastening plate 15 is greater than zero and becomes δ (L2 = δ, δ > 0).

[0046] After the main rope 1 is gripped by pressing the pressing bolt 18, it is secured with a nut 19 to prevent the pressing bolt 18 from loosening. That is, the nut 19, which is separated from the end face 15a of the fastening plate 15, is tightened so that the nut 19 contacts the end face 15a. In this embodiment, the pressing method is as follows: the clamping plate 14A is pressed onto the main rope 1 using the pressing bolt 18, and the main rope 1 is gripped together with the clamping plate 14B.

[0047] In this embodiment, the nut 19 and the pressing bolt 18, as well as the threaded hole (first threaded hole) 23 for fastening the pressing bolt 18, are arranged on the same side relative to the second clamping members 14A, 13 and the first clamping members 14B, 12. Furthermore, when tightening the pressing bolt 18, it is not necessary to prevent the fastening plate 15 with the threaded hole 23 for the pressing bolt from rotating simultaneously.

[0048] In this case, the pressing bolt 18 has a nut 19 on the opposite side of the fastening plate 15 relative to the side where the second clamping members 14A, 13 are provided, to prevent the pressing bolt 18 from loosening.

[0049] Therefore, while holding the main rope 1, the pressing bolt 18 and the nut 19 used to prevent loosening can be operated from one direction. In this case, the pressing bolt 18 and the nut 19 are operated from one end face 15b of the fastening plate 15.

[0050] Reference Figures 2 to 5 The gripping state of the main rope 1 ( Figure 4 and Figure 5 The state shown returns to the released state. Figure 2 and Figure 3 The operation (release operation) when the state shown is described.

[0051] During the release operation, it is necessary to release the anti-loosening operation of the pressing bolt 18 and pull up the pressing bolt 18. The anti-loosening operation of the pressing bolt 18 is performed by loosening the nut 19. The operation of pulling up the pressing bolt 18 involves pulling the pressing bolt 18 from the end face 15a of the fastening plate 15 into the end face 15b side, so that the front end 18a of the pressing bolt 18 separates from the end face 13b of the movable plate 13.

[0052] Next, the release bolt 26 is passed through the release bolt through hole 24 formed in the fastening plate 15 (see reference). Figure 2 The release bolt 26 is screwed into the release bolt threaded hole (second threaded hole) 22 formed on the movable plate 13. The release bolt 26 is used to separate the second clamping members 14A and 13, which are holding the main rope 1 together with the first clamping members 14B and 12, from the first clamping members 14B and 12. The movable plate 13 can be pulled up to the fastening plate 15 when the release bolt 26 is screwed into the release bolt threaded hole 22. That is, by screwing the release bolt 26 into the release bolt threaded hole (second threaded hole) 22, the second clamping members 14A and 13 move away from the first clamping members 14B and 12.

[0053] When the movable plate 13 is pulled to its maximum extent, such as Figure 2 and Figure 3As shown, the gap L2 between the end face 13b of the movable plate 13 and the end face 15a of the fastening plate 15 is zero (L2=0). At this time, since the movable plate 13 has moved δ from the gripping state of the main rope 1, the size Lb of the gap L1 between the pair of clamping plates 14A and 14B in the released state of the main rope 1 is the size after subtracting δ from La (Lb=La-δ).

[0054] The movable plate 13 has a guide insertion hole 21 for the guide 16 to be inserted (see reference). Figure 2 and Figure 4 The movable plate 13 can move along the guide 16, thus allowing it to move parallel to the main rope 1. Therefore, when the movable plate 13 is pulled up, a certain distance La is provided from top to bottom between the opposing pair of clamping plates 14A and 14B. Thus, the rope holding device 8, with the guide 16 and release bolt 26, ensures an appropriate gap between the pair of clamping plates 14A and 14B for the main rope 1 to pass through during the lifting process in the temporary machine room 6, thereby enabling the smooth delivery of the main rope 1.

[0055] The operation of returning the main rope 1 from the gripped state to the released state includes operating the nut 19 and the pressing bolt 18, as well as the releasing bolt 26. These operations can be performed from one direction. That is, these operations can be performed from one end face 15b of the fastening plate 15.

[0056] In this embodiment, the nut 19, the pressing bolt 18, the threaded hole (first threaded hole) 23 for the pressing bolt 18, and the release bolt 26 are arranged on the same side relative to the second clamping members 14A, 13 and the first clamping members 14B, 12. Furthermore, when the pressing bolt 18 is released, it is not necessary to prevent the fastening plate 15 with the threaded hole 23 for the pressing bolt from rotating simultaneously.

[0057] use Figure 6 The fastening plate 15 will be explained. Figure 6 From Figure 2 A cross-sectional view of the fastener 15 when viewed in the indicated direction.

[0058] The fastening plate 15 has a threaded hole 23 for pressing bolts on the end face 15b side and a bolt escape hole 28 on the end face 15a (movable plate 13) side. The diameter C of the bolt escape hole 28 is larger than the diameter B of the threaded hole for pressing bolts. That is, a bolt escape hole (escape hole) 28 is formed on the fastening plate 15 on the side of the second clamping members 14A, 13, relative to the threaded hole (first threaded hole) 23 for pressing bolts, through which the pressing bolt 18 is inserted. The diameter C of the bolt escape hole 28 is larger than the diameter B of the threaded hole (first threaded hole) 23 for pressing bolts.

[0059] By pressing down on the movable plate 13, the front end 18a of the pressing bolt 18 may sometimes undergo slight deformation. By providing a bolt escape hole 28 on the fastening plate 15, when the pressing bolt 18 is pulled into the fastening plate 15, the front end 18a of the pressing bolt 18 will not be stuck at the end face 15a of the fastening plate 15. This allows for repeated gripping and releasing of the main rope 1. If the diameter C of the bolt escape hole 28 is at least 2 mm larger than the diameter B of the threaded hole 23 for the pressing bolt, it is possible to suppress or prevent the slight deformation of the front end 18a of the pressing bolt 18 from getting stuck at the end face 15a of the fastening plate 15.

[0060] The above embodiments describe a rope holding device used in a construction elevator, but it is not limited to elevators and can also be used as a rope holding device for holding ropes in other devices.

[0061] This invention is not limited to the embodiments described above, and includes various modifications. For example, the embodiments described above are detailed descriptions for ease of understanding of the invention and are not limited to having all structures. Furthermore, some structures in the embodiments may be added to, deleted from, or substituted for other structures.

[0062] Label Explanation

[0063] 1…Main rope (rope), 8…Rope gripping device, 13…Modible plate, 12…Fixed plate, 14A…Second clamping plate, 14A, 13…Second clamping member, 14B…First clamping plate, 14B, 12…First clamping member, 15…Fastening plate, 16…Guide (guide member), 17…Fastening bolt, 18…Pressing bolt, 19…Nut, 21…Guide through hole, 22…Threaded hole for release bolt (second threaded hole), 23…Threaded hole for pressing bolt (first threaded hole), 24…Through hole for release bolt, 25A, 25B…Slot, 26…Release bolt, 28…Bolt escape hole (escape hole).

Claims

1. A rope gripping device, characterized in that it comprises: A first clamping member having a fixing plate and a first clamping plate fixed to the fixing plate; A fastening plate, the relative position of which is fixed to the first clamping member is secured by fastening bolts fastened to the fixing plate, the fastening plate having a first threaded hole and a release bolt through hole; A second clamping member is movably disposed between the first clamping member and the fastening plate, and a second threaded hole is formed thereon; as well as The pressing bolt presses the second clamping member against the first clamping member, thereby gripping the rope using both the first and second clamping members. A positioning mechanism that positions the fastening plate relative to the first clamping member, such that the gap between the fastening plate and the fixing plate of the first clamping member is maintained at a certain size; as well as The release bolt separates the second clamping member, which is holding the rope together with the first clamping member, from the first clamping member. The positioning mechanism sets the interval between the fastening plate and the fixing plate of the first clamping member, such that when the rope is held, a greater than zero interval is created between the fastening plate and the second clamping member. The pressing bolt is configured to be screwed into the first threaded hole from the side of the fastening plate opposite to the side where the second clamping member is located. The front end of the pressing bolt, which is inserted into the first threaded hole, presses the second clamping member toward the side of the first clamping member. The release bolt is configured to be screwed into the second threaded hole of the second clamping member through the release bolt through hole of the fastening plate, thereby moving the second clamping member away from the first clamping member.

2. The rope gripping device as described in claim 1, characterized in that, It includes a guide member that guides the movement of the second clamping member. The second clamping member has a guide insertion hole through which the guide member is inserted, and moves along the guide member.

3. The rope gripping device as described in claim 1, characterized in that, include: A guiding member that guides the movement of the second clamping member. The guiding component constitutes the positioning mechanism.

4. The rope gripping device as described in claim 1, characterized in that, The fastening plate has an escape hole, which is located on the side of the second clamping member relative to the first threaded hole, for the pressing bolt to pass through. The diameter of the escape hole is larger than the diameter of the first threaded hole.

5. The rope gripping device as described in claim 1, characterized in that, The pressing bolt has a nut on the opposite side of the fastening plate relative to the side where the second clamping member is disposed, to prevent the pressing bolt from loosening.

6. The rope gripping device as described in claim 1, characterized in that, The second clamping member includes: a movable plate having a guide insertion hole for the guide member to pass through; and a second clamping plate fixed to the movable plate. The first clamping plate and the second clamping plate have grooves that contact the rope to clamp the rope.

7. The rope gripping device as described in claim 1, characterized in that, The pressing bolt and the first threaded hole are positioned on the same side relative to the second clamping member.

8. The rope gripping device as claimed in claim 1, characterized in that, include: A guiding member that guides the movement of the second clamping member; as well as An escape hole is formed in the fastening plate on one side of the second clamping member relative to the first threaded hole, for the insertion of the pressing bolt. The second clamping member includes: a movable plate having a guide insertion hole for the guide member to pass through; and a second clamping plate fixed to the movable plate. The first clamping plate and the second clamping plate have grooves that contact the rope to clamp it. The guiding component constitutes the positioning mechanism. The diameter of the escape hole is larger than the diameter of the first threaded hole. The pressing bolt has a nut on the opposite side of the fastening plate relative to the side where the second clamping member is disposed, to prevent the pressing bolt from loosening.

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