Vernier feeler gauge with fixed reading

Abstract

The invention provides a vernier feeler gauge with fixed reading, and relates to the technical field of measuring tools, the vernier feeler gauge comprises a grab handle, a right-angle plate is fixed at the front end of the grab handle, the right-angle side of the bottom of the right-angle plate is flush with the bottom of the grab handle, a sliding piece is slidably mounted on the inclined surface of the right-angle plate, and measuring rulers are arranged on the two sides of the inclined surface of the right-angle plate. A moving cavity is formed in the grab handle, a cavity is formed in the right-angle plate, the moving cavity is communicated with the cavity, a pushing assembly is installed in the moving cavity, the pushing assembly comprises a sliding rail, and compared with the prior art, the sliding part can be pushed to move along the right-angle plate through the pushing assembly, and the needed length can be measured; after the sliding piece is in extrusion contact with a measured object, the rotating button is rotated, the connecting rod and the arc plate are staggered, the push plate is attached to the outer side of the grab handle, the lantern ring is in contact with the inner wall of the vertical frame, friction limiting of the push plate and limiting of the lantern ring are achieved, stability of the sliding piece in the horizontal direction and the vertical direction is kept, and later reading is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of measuring tools, in particular to a vernier feeler gauge with a fixed reading. Background Art

[0002] Vernier wedge feeler gauges, as a high-precision measuring tool, are mainly used to measure the gap, depth, height and other dimensional parameters between objects. Whether in the fields of machinery manufacturing, equipment installation, or quality inspection, vernier wedge feeler gauges play an indispensable role. Usually, when measuring the flatness of a wall, a straightedge (a tool used in conjunction with a vernier feeler gauge) is placed on the wall first, and then the vernier feeler gauge is used to measure the distance between the straightedge and the wall. After the measurement, the scale of the feeler gauge cannot be automatically retracted, and the vernier feeler gauge must be pushed back to 0 by hand, which is very inconvenient.

[0003] After measuring, the existing vernier feeler gauge is easily offset due to collision or extrusion, resulting in changes in the measured value, affecting the accuracy of the measurement, and it is not convenient to lock the position of the measuring ruler immediately after the measurement to facilitate subsequent readings. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a vernier feeler gauge with a fixed reading to solve the problems raised in the above-mentioned background technology. The present invention has a novel structure. The pushing component can push the sliding part to move along the right-angle plate and measure the required length. After the sliding part is in squeeze contact with the object to be measured, the knob is turned to stagger the position of the connecting rod and the arc plate, so that the push plate is attached to the outside of the handle and the ring is in contact with the inner wall of the vertical frame, thereby achieving friction limiting of the push plate and limiting of the ring, maintaining the stability of the sliding part in the horizontal and vertical directions, and facilitating later readings.

[0005] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions: a vernier feeler gauge with a fixed reading, comprising a handle, a right-angle plate is fixed to the front end of the handle, and the right-angle side of the bottom of the right-angle plate is flush with the bottom of the handle, a sliding member is slidably installed on the inclined surface of the right-angle plate, and measuring rulers are arranged on both sides of the inclined surface of the right-angle plate, a moving cavity is arranged inside the handle, and a cavity is arranged inside the right-angle plate, the moving cavity is connected to the cavity, a pushing component is installed in the moving cavity, and the pushing component includes a slide rail, and the top and bottom of the moving cavity are connected to the sliding rail. A slide rail is fixed on the inner wall, and a slide is slidably installed in the slide rail, vertical plates are provided on both sides of the slide, and extension plates are fixed on both sides of the vertical plates passing through the handle, and push plates are fixed to the outer ends of the extension plates, and a connecting plate is installed on the surface of the slide, and the other end of the connecting plate is rotatably connected to the bottom surface of the sliding part through a rotating shaft, a protective component is provided inside the front end of the right-angle plate, and the protective component includes a blocking cloth, and a blocking cloth is rotatably rolled up inside the front end of the right-angle plate through a winding shaft and a torsion spring, and the movable end of the blocking cloth passes through the right-angle plate and is transmission-connected to the slide.

[0006] Furthermore, the pushing assembly also includes a storage plate, and the storage plate is slidably installed at the position of the top of the handle corresponding to the two groups of push plates, and the two ends of the storage plate are slidably plugged with extension plates, and the extension plates are fixedly connected to the push plates.

[0007] Furthermore, an arc plate is fixed on the top of the push plate, and the arc plates on both sides of the handle are symmetrically arranged about the center of the circle, a knob is rotatably installed on the top of the storage plate through a bearing, and connecting rods are fixed on both sides of the knob, a sliding frame is rotatably installed on one end of the connecting rod toward the arc plate through a rotating shaft, and the sliding frame is slidably sleeved on the surface of the arc plate.

[0008] Furthermore, a sliding rod is fixed in the middle of the sliding rack, a sliding sleeve is slidably sleeved on the surface of the sliding rod, and the sliding sleeve is fixedly connected to the other end of the connecting plate.

[0009] Furthermore, the top and bottom of the slide frame are provided with slide grooves on the surfaces on both sides of the slide rod, the top and bottom of the vertical plate are slidably installed inside the slide grooves, and a second spring is fixed between the inner wall of the slide groove and the vertical plate.

[0010] Furthermore, a vertical frame is fixed on the inner surface of the vertical board, and a toothed groove is arranged on the inner surface of the vertical frame. Toothed plates are fixed on both sides of the sliding sleeve, and the toothed plates slide along the inside of the vertical frame.

[0011] Furthermore, a friction plate is fixed on the inner surface of the push plate, a friction groove is provided on the outer wall of the handle, and the friction plate is in sliding friction contact with the friction groove.

[0012] Furthermore, a first spring is fixed on the inner wall of the movable cavity at one end away from the right-angle plate, and the other end of the first spring is fixedly connected to the back side of the slide.

[0013] Furthermore, the protective component also includes a wire threading groove, and a wire threading groove is provided on the middle surface of the right-angle plate and the handle. A connecting rope is arranged inside the wire threading groove, and one end of the connecting rope is fixed on the baffle cloth, and a ring is fixed on the other end of the connecting rope, and the ring is connected to the knob.

[0014] Furthermore, the right-angle plate is provided with an outlet corresponding to the position where the blocking cloth passes through, and the blocking cloth passes through the outlet, and moving notches are provided on both sides of the handle corresponding to the position where the extension plate moves.

[0015] Beneficial effects of the present invention:

[0016] 1. The present invention sleeves the ring at one end of the pull rope onto the knob. As the push assembly is pulled backward, the blocking cloth is sent out from the outlet and covers the inclined surface of the right-angle plate to protect the measuring ruler on the inclined surface of the right-angle plate to avoid unclear scales due to wear. When using the device, the ring is first separated from the knob. Under the action of the reel and the torsion spring, the blocking cloth is retracted into the front end of the right-angle plate to avoid the length being measured.

[0017] 2. In the present invention, when the connecting rod rotates with the knob to be perpendicular to the push plate, the sliding frame is located on the arc plate close to the push plate. At this time, the push plate is farthest from the handle, and the toothed plates on both sides of the sliding sleeve are also separated from the vertical frame, which can facilitate the movement of the push assembly. After being released, under the action of the elastic force of the first spring, the push will pull the sliding member backward and return to the zero position, which is convenient for next use.

[0018] 3. The present invention can adjust the position of the push plate and the outer wall of the handle by moving the sliding frame along the arc plate, and maintains the connection between the push plate and the knob by extending the plate and the storage plate. When the sliding frame moves to the farthest end of the arc plate, the connecting rod is inclined, the push plate is attached to the outer wall of the handle, the friction plate is in contact with the friction groove, and at the same time the vertical plate slides along the sliding groove through the second spring, and the tooth plate is inserted into the interior of the vertical frame. The tooth plate is in contact with the tooth groove in the vertical frame to limit the position of the sliding sleeve. At this time, the sliding sleeve cannot move along the sliding rod, and the push plate cannot move in the horizontal direction, thereby limiting the horizontal and vertical movement of the sliding member connected to the connecting plate, maintaining the position of the sliding member on the inclined surface of the right-angle plate, making it convenient to take out the reading after measurement, and no position deviation will occur.

[0019] 4. In the present invention, the sliding sleeve slides along the sliding rod and the push plate moves along the moving notch. The lateral and vertical displacements can make the sliding member slide along the inclined surface of the right-angle plate, thereby completing the movement measurement of the sliding member.

[0020] 5. Compared with the prior art, the present invention can push the sliding member to move along the right-angle plate through the pushing assembly and measure the required length. After the sliding member is squeezed and contacted with the object to be measured, the knob is turned to stagger the position of the connecting rod and the arc plate, so that the push plate is attached to the outside of the handle and the collar is in contact with the inner wall of the vertical frame, thereby achieving friction limitation of the push plate and limitation of the collar, maintaining the stability of the sliding member in the horizontal and vertical directions, and facilitating later readings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of a fixed reading vernier feeler gauge of the present invention;

[0022] Figure 2 A schematic diagram of the internal structure of a handle and a right-angle plate of a fixed reading vernier feeler gauge of the present invention;

[0023] Figure 3It is a schematic diagram of the connection between the push assembly and the handle of a fixed reading vernier feeler gauge of the present invention;

[0024] Figure 4 This is a schematic diagram of the connection between a connecting rod and two push plates of a fixed reading vernier feeler gauge of the present invention;

[0025] Figure 5 A schematic diagram of the internal structure of a slide frame of a fixed reading vernier feeler gauge of the present invention;

[0026] Figure 6 It is a schematic diagram of the cooperation between the tooth plate and the vertical frame of a vernier feeler gauge with a fixed reading according to the present invention;

[0027] Figure 7 It is a schematic diagram of the structure of a driving component of a fixed reading vernier feeler gauge of the present invention;

[0028] Figure 8 The present invention is a schematic diagram of a fixed reading vernier feeler gauge having a cloth stopper passing out.

[0029] In the figure: 1. handle; 11. moving cavity; 12. first spring; 2. right-angle plate; 21. sliding member; 22. measuring ruler; 23. cavity; 3. pushing assembly; 31. slide rail; 32. slide frame; 33. connecting plate; 34. vertical plate; 35. slide rod; 36. sliding sleeve; 37. moving notch; 38. extension plate; 39. push plate; 310. storage plate; 311. extension plate; 312. arc plate; 313. slide frame; 314. knob; 315. connecting rod; 316. slide groove; 317. second spring; 318. vertical frame; 319. toothed groove; 320. toothed plate; 321. friction plate; 322. friction groove; 4. protection assembly; 41. rope threading groove; 42. connecting rope; 43. ring; 44. outlet; 45. cloth stop. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0031] See also Figures 1 to 8The present invention provides a technical solution: a vernier feeler gauge with a fixed reading, comprising a handle 1, a right-angle plate 2 is fixed to the front end of the handle 1, and the right-angle side of the bottom of the right-angle plate 2 is flush with the bottom of the handle 1, a sliding member 21 is slidably installed on the inclined surface of the right-angle plate 2, and measuring rulers 22 are arranged on both sides of the inclined surface of the right-angle plate 2, a moving cavity 11 is arranged inside the handle 1, and a cavity 23 is arranged inside the right-angle plate 2, the moving cavity 11 is communicated with the cavity 23, a pushing component 3 is installed in the moving cavity 11, and the pushing component 3 includes a slide rail 31, the slide rail 31 is fixed on the top and bottom inner walls of the moving cavity 11, and a slide 32 is slidably installed in the slide rail 31, vertical plates 34 are arranged on both sides of the slide 32, and extension plates 38 are fixed on both sides of the vertical plates 34 passing through the handle 1, and push plates 39 are fixed on the outer ends of the extension plates 38, and push plates 39 are arranged on the surface of the slide 32 A connecting plate 33 is installed, and the other end of the connecting plate 33 is rotatably connected to the bottom surface of the sliding member 21 through a rotating shaft. A protective component 4 is provided inside the front end of the right-angle plate 2, and the protective component 4 includes a blocking cloth 45. The blocking cloth 45 is rotatably rolled up inside the front end of the right-angle plate 2 through a winding shaft and a torsion spring. The movable end of the blocking cloth 45 passes through the right-angle plate 2 and is transmission-connected to the slide 32. When the device is used, the sliding member 21 and the pushing component 3 are respectively located at the highest point of the inclined surface of the right-angle plate 2 and the rear end of the handle 1. The tip of the right-angle plate 2 is inserted into the measuring position, and the pushing component 3 drives the sliding member 21 to slide along the inclined surface of the right-angle plate 2 until it is squeezed and contacted with the object to be measured. Then the pushing component 3 is released to lock the position of the sliding member 21 on the inclined surface of the right-angle plate 2. After the device is taken out, its position is read. When not in use, the blocking cloth 45 of the protective component 4 is unfolded to protect the inclined surface of the right-angle plate 2.

[0032] In this embodiment, a sliding rod 35 is fixed in the middle of the sliding frame 32, and a sliding sleeve 36 is slidably sleeved on the surface of the sliding rod 35, and the sliding sleeve 36 is fixedly connected to the other end of the connecting plate 33. The sliding sleeve 36 slides along the sliding rod 35 and the push plate 39 moves along the moving notch 37. The lateral and vertical displacements can allow the sliding member 21 to slide along the inclined surface of the right-angle plate 2, thereby completing the movement measurement of the sliding member 21.

[0033] In this embodiment, the pushing assembly 3 also includes a storage plate 310, and the storage plate 310 is slidably installed at the position of the two groups of push plates 39 on the top of the handle 1, and the two ends of the storage plate 310 are slidably plugged with extension plates 311, and the extension plates 311 are fixedly connected to the push plates 39, and the top of the push plates 39 is fixed with an arc plate 312, and the arc plates 312 on both sides of the handle 1 are symmetrically arranged with the center of the circle, and the top of the storage plate 310 is rotatably installed with a knob 314 through a bearing, and connecting rods 315 are fixed on both sides of the knob 314, and the connecting rod 315 is connected to one end of the arc plate 312 through The rotating shaft is rotatably mounted with a sliding frame 313, and the sliding frame 313 is slidably sleeved on the surface of the arc plate 312. The top and bottom of the sliding frame 32 are provided with sliding grooves 316 on the surfaces on both sides of the sliding rod 35. The top and bottom of the vertical plate 34 are slidably mounted inside the sliding grooves 316. A second spring 317 is fixed between the inner wall of the sliding groove 316 and the vertical plate 34. A vertical frame 318 is fixed on the inner side surface of the vertical plate 34, and a tooth groove 319 is provided on the inner side surface of the vertical frame 318. Tooth plates 320 are fixed on both sides of the sliding sleeve 36. The tooth plates 320 are moved along the vertical frame 31 8 slides inside, a friction plate 321 is fixed to the inner surface of the push plate 39, a friction groove 322 is opened on the outer wall of the handle 1, and the friction plate 321 and the friction groove 322 are in sliding and friction contact. When the knob 314 is turned, the rotating rod will rotate together, and the position of the push plate 39 and the outer wall of the handle 1 can be adjusted by moving the sliding frame 313 along the arc plate 312. The connection between the push plate 39 and the knob 314 is maintained by the extension plate 311 and the storage plate 310. When the sliding frame 313 moves to the farthest end of the arc plate 312, the connecting rod 315 is inclined, and the push plate 39 is attached to the outer wall of the handle 1. The wiping plate 321 contacts with the friction groove 322, and at the same time, the vertical plate 34 slides along the slide groove 316 through the second spring 317, and the tooth plate 320 is inserted into the vertical frame 318. The tooth plate 320 contacts with the tooth groove 319 in the vertical frame 318 to limit the position of the sliding sleeve 36. At this time, the sliding sleeve 36 cannot move along the sliding rod 35, and the push plate 39 cannot move in the horizontal direction, thereby limiting the horizontal and vertical movement of the sliding member 21 connected to the connecting plate 33, and maintaining the position of the sliding member 21 on the inclined surface of the right-angle plate 2, which is convenient for taking out the reading after measurement and will not cause position deviation.

[0034] In this embodiment, a first spring 12 is fixed on the inner wall of the movable cavity 11 away from one end of the right-angle plate 2, and the other end of the first spring 12 is fixedly connected to the back of the slide 32. When the connecting rod 315 rotates with the knob 314 to be perpendicular to the push plate 39, the slide frame 313 is located on the arc plate 312 close to the push plate 39. At this time, the push plate 39 is farthest from the handle 1, and the tooth plates 320 on both sides of the slide sleeve 36 will also be separated from the vertical frame 318, which can facilitate the movement of the push component 3. After releasing, the push will be pulled backward by the elastic force of the first spring 12 to return to the zero position for the next use.

[0035] In this embodiment, the protective component 4 also includes a threading groove, a threading groove 41 is provided on the middle surface of the right-angle plate 2 and the handle 1, a connecting rope 42 is arranged inside the threading groove 41, and one end of the connecting rope 42 is fixed on the blocking cloth 45, and the other end of the connecting rope 42 is fixed with a ring 43, and the ring 43 is sleeved on the knob 314, the right-angle plate 2 is provided with a through-hole 44 corresponding to the position where the blocking cloth 45 passes through, and the blocking cloth 45 passes through the through-hole 44, and the two sides of the handle 1 are provided with moving notches 37 corresponding to the position where the extension plate 38 moves, and the front end of the right-angle plate 2 is provided with a through-hole 44 corresponding to the position where the extension plate 38 moves. A winding shaft is installed inside, which is not shown in the figure. It is a common winding structure. The cloth 45 is wound up. After the measurement is completed, the ring 43 at one end of the pull rope is sleeved on the knob 314. As the pushing component 3 is pulled backward, the cloth 45 will be sent out from the through-hole 44 and cover the inclined surface of the right-angle plate 2 to protect the measuring ruler 22 on the inclined surface of the right-angle plate 2 to avoid unclear scales caused by wear. When using the device, first separate the ring 43 from the knob 314. Under the action of the winding shaft and the torsion spring, the cloth 45 is retracted into the front end of the right-angle plate 2 to avoid the length being measured.

[0036] When the device is in use, the sliding member 21 and the pushing assembly 3 are respectively located at the highest point of the inclined surface of the right-angled plate 2 and the rear end of the handle 1. The tip of the right-angled plate 2 is inserted into the measuring position, and the pushing assembly 3 drives the sliding member 21 to slide along the inclined surface of the right-angled plate 2 until it is squeezed and contacted with the object to be measured. Then, the pushing assembly 3 is released to lock the position of the sliding member 21 on the inclined surface of the right-angled plate 2. After the device is taken out, its position is read. When the knob 314 is turned, the rotating rod will rotate together. The position of the push plate 39 and the outer wall of the handle 1 can be adjusted by moving the sliding frame 313 along the arc plate 312. The connection between the push plate 39 and the knob 314 is maintained by the extending plate 311 and the storage plate 310. When the sliding frame 313 moves to the farthest end of the arc plate 312, the connecting rod 315 is inclined, the push plate 39 is attached to the outer wall of the handle 1, and the friction plate 321 contacts the friction groove 322. At the same time, the vertical plate 34 slides along the sliding groove 316 through the second spring 317 to move the tooth plate 320 When the locking cam 314 is in the locked state, the locking cam 316 is in a locked state, and the locking cam 316 is in a locked state.

[0037] The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention.

[0038] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A fixed reading vernier feeler gauge, comprising a handle (1), characterized in that: A right-angle plate (2) is fixed to the front end of the handle (1), and the right-angled side of the bottom of the right-angle plate (2) is flush with the bottom of the handle (1); a sliding member (21) is slidably mounted on the inclined surface of the right-angle plate (2), and measuring rulers (22) are arranged on both sides of the inclined surface of the right-angle plate (2); a moving cavity (11) is provided inside the handle (1), and a cavity (23) is provided inside the right-angle plate (2); the moving cavity (11) is communicated with the cavity (23); a pushing component (3) is installed in the moving cavity (11), and the pushing component (3) includes a slide rail (31); the slide rail (31) is fixed on the inner wall of the top and bottom of the moving cavity (11), and a slide frame (32) is slidably mounted in the slide rail (31); ), vertical plates (34) are provided on both sides of the slide (32), and extension plates (38) are fixed on both sides of the vertical plates (34) passing through the handle (1), and push plates (39) are fixed on the outer ends of the extension plates (38), and a connecting plate (33) is installed on the surface of the slide (32), and the other end of the connecting plate (33) is rotatably connected to the bottom surface of the sliding member (21) through a rotating shaft, and a protective component (4) is provided inside the front end of the right-angle plate (2), and the protective component (4) includes a blocking cloth (45), and a blocking cloth (45) is rotatably wound inside the front end of the right-angle plate (2) through a winding shaft and a torsion spring, and the movable end of the blocking cloth (45) passes through the right-angle plate (2) and is transmission-connected to the slide (32).

2. A fixed reading vernier feeler gauge according to claim 1, characterized in that: The pushing assembly (3) further comprises a receiving plate (310), the receiving plate (310) being slidably mounted at a position on the top of the handle (1) corresponding to the two groups of pushing plates (39), and extending plates (311) being slidably plugged at both ends of the receiving plate (310), the extending plates (311) being fixedly connected to the pushing plates (39).

3. A fixed reading vernier feeler gauge according to claim 2, characterized in that: An arc plate (312) is fixed on the top of the push plate (39), and the arc plates (312) on both sides of the handle (1) are symmetrically arranged about the center of a circle. A rotating knob (314) is rotatably mounted on the top of the storage plate (310) via a bearing, and connecting rods (315) are fixed on both sides of the rotating knob (314). A sliding frame (313) is rotatably mounted on one end of the connecting rod (315) facing the arc plate (312) via a rotating shaft, and the sliding frame (313) is slidably sleeved on the surface of the arc plate (312).

4. A fixed reading vernier feeler gauge according to claim 3, characterized in that: A sliding rod (35) is fixed in the middle of the sliding rack (32), a sliding sleeve (36) is slidably sleeved on the surface of the sliding rod (35), and the sliding sleeve (36) is fixedly connected to the other end of the connecting plate (33).

5. A fixed reading vernier feeler gauge according to claim 4, characterized in that: The top and bottom of the slide frame (32) are provided with slide grooves (316) on the surfaces on both sides of the slide rod (35), the top and bottom of the vertical plate (34) are slidably installed inside the slide grooves (316), and a second spring (317) is fixed between the inner wall of the slide groove (316) and the vertical plate (34).

6. A fixed reading vernier feeler gauge according to claim 5, characterized in that: A vertical frame (318) is fixed on the inner surface of the vertical plate (34), and a tooth groove (319) is arranged on the inner surface of the vertical frame (318). Tooth plates (320) are fixed on both sides of the sliding sleeve (36), and the tooth plates (320) slide along the inside of the vertical frame (318).

7. A fixed reading vernier feeler gauge according to claim 6, characterized in that: A friction plate (321) is fixed on the inner surface of the push plate (39), a friction groove (322) is provided on the outer wall of the handle (1), and the friction plate (321) is in sliding friction contact with the friction groove (322).

8. A fixed reading vernier feeler gauge according to claim 7, characterized in that: A first spring (12) is fixed on the inner wall of the movable cavity (11) at one end away from the right-angle plate (2), and the other end of the first spring (12) is fixedly connected to the back side of the slide bracket (32).

9. A fixed reading vernier feeler gauge according to claim 3, characterized in that: The protective component (4) also includes a wire threading groove, wherein a wire threading groove (41) is provided on the middle surface of the right-angle plate (2) and the handle (1), a connecting rope (42) is arranged inside the wire threading groove (41), and one end of the connecting rope (42) is fixed on the blocking cloth (45), and a ring (43) is fixed on the other end of the connecting rope (42), and the ring (43) is sleeved on the knob (314).

10. A fixed reading vernier feeler gauge according to claim 9, characterized in that: The right-angle plate (2) is provided with a through-hole (44) at a position corresponding to the position where the blocking cloth (45) passes through, and the blocking cloth (45) passes through the through-hole (44). The two sides of the handle (1) are provided with moving notches (37) at positions corresponding to the movement of the extension plate (38).

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