Labor-saving ratchet bandage tensioner

Abstract

The labor-saving ratchet bandage tensioner comprises a base, a base plate, a pulling handle, a pulling piece, a ratchet, a clamping piece, a blocking piece, a coil spring and the like, and is mainly characterized in that a brake pad is arranged in the base, the brake pad elastically presses a ratchet disc of the ratchet to form braking force, and an arc edge is arranged at the bottom of a pulling plate; therefore, when the blocking piece and the clamping piece are both separated from the ratchet disc, the ratchet wheel can overcome the braking force to form reverse rotation so as to quickly release and tension the bandage, and the reverse rotation of the ratchet wheel also synchronously drives the coil spring to compress and accumulate potential energy; then, the pulling handle is pulled close to the base, the arc edge can be driven to slide and push the brake pad to adjust the braking force, when the braking force is larger than potential energy, the brake pad limits the coil spring to drive the ratchet wheel to automatically rotate forwards, when the braking force is smaller than the potential energy, the coil spring can release the potential energy and drive the ratchet wheel to automatically rotate forwards, and then the tensioning bandage is rapidly wound on the ratchet wheel shaft. Therefore, the improved structure has the advantages of being simple in structure, convenient and labor-saving to operate, capable of guaranteeing continuous and stable braking force and the like.

Description

Technical Field

[0001] This utility model relates to a ratchet strap tensioner, specifically a labor-saving ratchet strap tensioner. Background Technology

[0002] Currently, ratchet strap tensioners are used for cargo bundling. The structure mainly consists of a base, a base plate at the front of the base, an actuating handle, an actuating plate at the front of the actuating handle, and a ratchet. It also includes a fixed strap connected to the base, and a tensioning strap with one end wound around the ratchet shaft and the other end being the free end for bundling. At the same time, the base is equipped with a locking device and a coil spring for automatic strap retraction. The actuating handle is equipped with a stop, and the actuating handle is hinged to the base plate of the base to form a rotatable connection. The ratchet is coaxially mounted with the actuating axis. In this way, when both the stop and the locking mechanism are engaged with the ratchet, simply moving the lever back and forth relative to the base will drive the ratchet to rotate intermittently in one direction to wind and tighten the strap through the alternating engagement of the stop and the locking mechanism. Alternatively, when both the stop and the locking mechanism are disengaged from the ratchet, the ratchet is in a free-rotating state, which can quickly release the tightened strap or automatically rewind the released tightened strap onto the ratchet via a coil spring for rapid strap rewinding. At the same time, to prevent the coil spring from winding too quickly and causing safety hazards, a brake pad is often designed inside the base. This brake pad is usually elastically pressed against the winding mechanism. The braking force is generated on the tension strap by the contact friction between the brake pads and the tension strap. However, the magnitude of this braking force is often affected by the thickness of the tape; the thinner the tape, the smaller the braking force, and the thicker the tape, the larger the braking force. In other words, the braking force of the brake pads cannot remain stable continuously during tape unwinding or winding. For example, in actual use, when the tape is very thin, the braking force exerted by the brake pads on the tape is very small, while the potential energy accumulated by the compressed spring is at its maximum. Therefore, the braking force on the tension strap under this condition is relatively small. The force will be less than the potential energy of the coil spring. When the tension strap is fully pulled out of the ratchet, because the potential energy of the coil spring is greater than the braking force, it is difficult for the brake pad to lock the longest usable position of the tension strap. In addition, the braking force is released by the brake pad disengaging from the coil strap mainly through buttons or switches designed on the base. In actual use, the user needs to use one hand to move the lever closer to the base and the other hand to operate the brake pad, which makes the whole operation process more troublesome and laborious. In addition, the addition of these buttons or switches also increases the complexity of the overall structure. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a labor-saving ratchet strap tensioner that is simple in structure, easy to operate and labor-saving, and can ensure a continuous and stable braking force.

[0004] The technical problem of this utility model is solved by the following technical solution:

[0005] A labor-saving ratchet strap tensioner includes a base, a base plate at the front of the base, an actuating handle, an actuating plate at the front of the actuating handle, and a ratchet. The ratchet consists of a ratchet shaft and ratchet discs coaxially fixed to both ends of the ratchet shaft. It also includes a fixing strap connected to the base, and a tensioning strap with one end wound around and connected to the ratchet shaft and the other end being a free end for binding. The actuating handle is hinged to the base plate via the actuating plate to form a rotatable connection. The ratchet is coaxially mounted with the actuating axis of the actuating plate via the ratchet shaft. The base has a locking mechanism for engaging or disengaging the ratchet discs, and a coil spring is provided outside the base. The actuating handle has a stop mechanism for engaging or disengaging the ratchet discs. The base is also equipped with a brake pad, which elastically presses against the outer circumference of the ratchet disc to form a braking force. The bottom of the lever plate is provided with an arc edge. When the stop and the locking piece are disengaged from the ratchet disc, the free end of the binding is pulled outward, which drives the ratchet to overcome the braking force and reverse, thus quickly releasing the tension strap. The ratchet's reversal also synchronously drives the coil spring to compress and accumulate potential energy. The lever handle is brought closer to the base and drives the arc edge to slide and push the brake pad, thereby adjusting the braking force. When the braking force is greater than the potential energy, the brake pad restricts the coil spring from driving the ratchet to rotate automatically forward. When the braking force is less than the potential energy, the coil spring releases the potential energy and drives the ratchet to rotate automatically forward, thereby quickly winding the tension strap onto the ratchet shaft.

[0006] Both the stop and the locking piece engage with the ratchet disc. The lever reciprocates relative to the base and drives the ratchet to overcome the braking force and form a one-way intermittent forward rotation, thereby pulling the tensioning strap to wind around the ratchet shaft.

[0007] The front of the lever plate is provided with a push protrusion. The lever handle is brought closer to the base and drives the push protrusion to push the locking piece away from the ratchet disc.

[0008] The stop is pivotally installed in the lever handle and forms a rocker-type rotating structure. The rear end of the stop is elastically pushed upward, causing the front end of the stop to descend, or the rear end of the stop is pressed down, causing the front end of the stop to rise.

[0009] The substrate has a tape winding arc groove on its top, and the bottom of the arc groove is higher than the outer circumference of the ratchet disk; the stop has a positioning plate, which is fitted into the tape winding arc groove and disengages the stop from the ratchet disk.

[0010] The base plate is provided with a working arc groove on the top. The working arc groove is located in front of the tape winding arc groove, and the bottom of the arc groove is lower than the outer circumference of the ratchet disk. The positioning plate is fitted in the working arc groove and makes the stop engage the ratchet disk. The lever moves back and forth relative to the base and drives the positioning plate to slide back and forth in the working arc groove to form a lever stroke.

[0011] The top of the lever plate is provided with a positioning groove, the bottom of which is lower than the outer circumference of the ratchet disc; the positioning plate is fitted into the positioning groove.

[0012] A stop is provided between the working arc groove and the winding arc groove; the stop disengages from the ratchet disc, the lever closes relative to the base, and drives the positioning plate from the working arc groove over the stop to enter the winding arc groove.

[0013] The lower end of the brake pad is hinged to the base, and the upper end of the brake pad is provided with a braking protrusion. The braking protrusion is elastically pushed against the outer circumference of the ratchet disc to form a braking force.

[0014] The stop is composed of a baffle and a button fixed to the rear side of the baffle. The positioning plates are respectively arranged on the front two sides of the baffle, and the rear two sides of the baffle are respectively provided with support plates. The stop is pivotally installed in the lever handle through the support plates.

[0015] Compared with existing technologies, this utility model mainly features a brake pad within the base. This brake pad elastically presses against the ratchet disc of the ratchet wheel to create a braking force. An arc edge is also provided at the bottom of the lever plate. Thus, when the stop and locking components disengage from the ratchet disc, the free end of the strap is pulled outwards, causing the ratchet to overcome the braking force and reverse direction, quickly releasing the tension of the strap. Simultaneously, the ratchet's reversal also compresses the coil spring, accumulating potential energy. Furthermore, since the brake pad elastically presses against the outer circumference of the ratchet disc to create the braking force, and the outer circumference of the ratchet disc remains constant with rotation... Ultimately, the tightening force remains constant. Therefore, even when the coil spring's potential energy is at its maximum due to being fully pulled out of the ratchet, the braking force remains consistently stable. Then, by bringing the lever closer to the base, the curved edge slides and pushes against the brake pad, adjusting the braking force. Typically, when the braking force is greater than the potential energy, the brake pad restricts the coil spring from automatically rotating the ratchet. When the adjusted braking force is less than the potential energy, the coil spring releases its potential energy and drives the ratchet to rotate automatically, quickly winding the tightening strap onto the ratchet shaft. Clearly, this brake pad operation structure eliminates the need for additional buttons or switches, simplifying the overall design. In particular, the braking force can be adjusted simultaneously by sliding the brake pad against the base with the curved edge using only one hand, making the operation quite convenient and effortless. Attached Figure Description

[0016] Figure 1 This is the front view of the present invention.

[0017] Figure 2 for Figure 1 Rear view.

[0018] Figure 3 for Figure 1 Top view.

[0019] Figure 4 for Figure 1 A three-dimensional image.

[0020] Figure 5 for Figure 4 A three-dimensional exploded view.

[0021] Figure 6 This is a schematic diagram of the base structure.

[0022] Figure 7 for Figure 6 A three-dimensional image.

[0023] Figure 8 This is a schematic diagram of the lever mechanism.

[0024] Figure 9 for Figure 8 A three-dimensional image.

[0025] Figure 10 This is a schematic diagram of the stop component.

[0026] Figure 11 for Figure 10 A three-dimensional image.

[0027] Figure 12 This is a schematic diagram of the brake pad structure.

[0028] Figure 13 This is a schematic diagram of a ratchet.

[0029] Figure 14 This is a schematic diagram of the mandrel structure.

[0030] Figure 15 This is a schematic diagram of the sheath structure. Detailed Implementation

[0031] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0032] like Figures 1-15 As shown, 1. Base, 10. Fixing rod, 11. Base plate, 111. Working arc groove, 112. Belt winding arc groove, 113. Stop, 114. Slide groove, 2. Actuating handle, 21. Actuating plate, 211. Hoist hole, 212. Push protrusion, 213. Arc edge, 214. Positioning groove, 22. Protective handle, 3. Protective sleeve, 31. Belt threading hole, 4. Side cover, 41. Coil spring, 42. 5. Protective ring, 50. Stopper, 51. Stopper torsion spring, 51. Baffle, 511. Positioning plate, 512. Support plate, 52. Button, 6. Ratchet, 61. Ratchet shaft, 62. Ratchet disc, 7. Clamping piece, 71. Clamping piece spring, 72. Clamping piece plate, 721. Guide hole, 8. Brake pad, 80. Brake pad shaft, 81. Brake tightening protrusion, 82. Brake pad torsion spring, 9. Spindle, 91. Slot.

[0033] A labor-saving ratchet strap tensioner, such as Figures 1-5 As shown, this device is mainly used to assist in securing and binding goods. Its structure includes a base 1, a base plate 11 at the front of the base, a lever 2, a lever plate 21 at the front of the lever, and a ratchet 6. The ratchet consists of a ratchet shaft 61 and ratchet discs 62 coaxially fixed to both ends of the ratchet shaft. It also includes a fixing strap (not shown) connected to the base 1, and a tensioning strap (not shown) with one end wound around and connected to the ratchet shaft 61 and the other end being the free end for binding. This embodiment uses... Figure 1 The left side of the view shown represents the front or front side of the ratchet strap tensioner, and the right side represents the rear or rear side of the ratchet strap tensioner.

[0034] The base 1 as described Figure 6 , Figure 7 As shown, it is a structural component with a "U" shaped cross-section, consisting of a base plate and two side plates located on both sides of the base plate and bent vertically upwards. The front end of each of the two side plates is provided with a base plate 11, that is, the base plate is located at the front of the base. Each base plate has a shaft hole in the center, and the shaft holes of the two base plates 11 are exactly on the same horizontal axis.

[0035] The base is provided with a plastic protective sleeve 3 at the front, which can protect the base plate 11. The protective sleeve is provided with a strap hole 31, through which the free end of the binding strap can be passed.

[0036] The base is also provided with a "T"-shaped locking member 7. Specifically, the locking member is set inside the base 1 and located in front of the ratchet 6. The two ends of the "T" shape of the locking member 7 are respectively fitted into the sliding grooves 114 of the two side base plates 11. The tail of the "T" shape of the locking member 7 is provided with an elastic pushing locking spring 71. That is, the two ends of the locking spring are respectively pushed and installed on the locking member 7 and the locking plate 72 located in the protective sleeve 3. Therefore, under normal conditions, the elastic pushing of the locking spring 71 keeps the locking member 7 engaged with the ratchet disc 62. Only when the external force drives the locking member 7 to overcome the elastic pushing force of the locking spring 71 and slide along the sliding groove 114 can it disengage from the ratchet disc 62. Therefore, the action state of the locking member 7 needs to be engaged or disengaged from the ratchet disc 62 according to the actual working conditions. The locking plate 72 is also provided with a guide hole 721, which can be used to ensure the smooth operation of the locking member 7.

[0037] The base 1 is provided with a fixing rod 10 at the rear, which can be used to connect the fixing strap. A brake pad 8 is provided on the front side of the fixing rod 10. The lower end of the brake pad is hinged to the base 1 through a brake pad shaft 80. Therefore, the upper end of the brake pad 8 can rotate around the brake pad shaft 80, thereby approaching or moving away from the ratchet 6. The upper end of the brake pad is provided with a braking protrusion 81. The braking protrusion is elastically pushed by a brake pad torsion spring 82 installed on the brake pad shaft 80, thereby pressing against the outer circumference of the ratchet disc 62 to form a braking force.

[0038] The lever 2 mentioned above is as follows Figure 8 , Figure 9 As shown, it is a structural component with an inverted "U" shape in cross-section, consisting of a top plate and two side plates located on both sides of the top plate and bent vertically downwards. The front end of each of the two side plates is provided with a lever plate 21, that is, the lever plate is located in front of the lever handle. Each lever plate 21 is also provided with a shaft hole in the center, and the shaft holes of the two lever plates are exactly on the same horizontal axis.

[0039] In this way, the lever 2 can be hinged to the base plate 11 of the base 1 through the shaft hole via the lever plate 21, thus forming a lever 2 rotatable connection structure relative to the base 1.

[0040] The lever 2 has a plastic guard 22 at the rear, which allows the user to hold and operate it comfortably; the lever 2 has a stop 5 that is pivotally mounted and forms a rocker-type rotating structure. The stop is composed of a baffle 51 and a button 52 fixed to the rear side of the baffle.

[0041] The front two sides of the baffle 51 are respectively provided with positioning plates 511, and the rear two sides of the baffle are respectively provided with support plates 512. Therefore, the combination of positioning plates 511 and support plates 512 makes the entire baffle 51 form an "H" shaped component. The stop 5 is pivotally installed in the lever handle 2 via the support plates 512. Specifically, the support plates 512 on both sides are respectively fitted into the gourd holes 211 on both sides of the lever handle 2, thereby forming a rocker-type structure that can swing back and forth.

[0042] Meanwhile, under normal conditions, the rear end of the stop 5 is elastically pushed upward by the stop torsion spring 50 installed in the lever 2, which causes the front end of the stop to descend. At this time, the descending front end of the stop usually engages with the ratchet disc 62, or the torsion spring force can be overcome by pressing the button 52 with external force, which can cause the rear end of the stop to descend and drive the front end of the stop to rise. At this time, the rising front end of the stop usually disengages from the ratchet disc 62. Therefore, the action state of the stop 5 also needs to engage or disengage from the ratchet disc 62 according to the actual working conditions. The button 52 is usually designed with anti-slip texture and pressing indicator arrows to facilitate easy operation by the user.

[0043] The ratchet 6 as described Figure 13 As shown, it has a connecting groove on the ratchet shaft 61 for one end of the tension strap to pass through and be wound. The outer circumference of the ratchet discs 62 at both ends is provided with ratchet teeth inclined in the same circumferential direction. Figure 1 As shown in the example, they are all tilted in a clockwise direction.

[0044] The ratchet 6 is coaxially mounted with the lever plate 21 via the ratchet shaft 61. Specifically, the ratchet shaft 61 is a hollow flat hole shaft with a mandrel 9 passing through it. The mandrel is a solid flat shaft fitted with a flat hole, so the mandrel 9 and the ratchet 6 can rotate synchronously. The two ends of the mandrel 9 are respectively inserted into the shaft holes of the base plate 11 and the lever plate 21, and are supported and locked in position by the retaining ring 42. Therefore, the ratchet 6 rotates through the mandrel 9, and its rotation axis coincides with the lever axis of the lever 2.

[0045] The base 1 has side covers 4 that are fastened and fixed on both sides to close the two ends of the spindle 9, thus improving the overall appearance. At the same time, a coil spring 41 is provided inside one of the side covers 4. The inner end of the coil spring is engaged in the slot 91 at the end of the spindle 9 to form a connection. The outer end of the coil spring 41 is tightly installed inside the side cover 4. Therefore, the rotation of the spindle 9 driven by the ratchet 6 will also cause the coil spring 41 to be compressed synchronously to accumulate potential energy, or the potential energy can be released by the coil spring 41 to drive the spindle 9 to rotate, thereby driving the ratchet 6 to rotate synchronously.

[0046] Additionally, the top of the substrate 11 is provided with a working arc groove 111 and a winding arc groove 112. The working arc groove is located in front of the winding arc groove, and a stop 113 is provided between the working arc groove 111 and the winding arc groove 112. The arc-shaped bottom of the working arc groove 111 is lower than the outer circumference of the ratchet disk 62, and the arc-shaped bottom of the winding arc groove 112 is higher than the outer circumference of the ratchet disk 62. Moreover, according to... Figure 7 As shown, the top of the substrates 11 on both sides are provided with working arc grooves 111, tape winding arc grooves 112 and baffles 113, and it is also necessary to ensure that these design structures on the substrates 11 on both sides are symmetrical in position and have the same size.

[0047] The top of the lever plate 21 is provided with a positioning groove 214, the bottom of which is lower than the outer circumference of the ratchet disc 62, and the positioning plate 511 of the stop 5 can be fitted into the positioning groove 214. The bottom of the lever plate 21 is provided with an arc edge 213, and the front of the lever plate 21 is provided with a cam-like pushing protrusion 212. Figure 9 As shown, the structures designed on the two lever plates 21 are all symmetrically positioned and have the same dimensions.

[0048] Thus, based on the above structure, the ratchet strap tensioner will have three working states:

[0049] The first state is the normal operating state, specifically: the rear end of the stop in the lever 2 is pushed upward by the stop spring 50, causing the front end of the stop to descend. This descending front end of the stop will simultaneously fit into the positioning groove 214 and the working arc groove 111. Since the bottom of both the positioning groove 214 and the working arc groove 111 is lower than the outer circumference of the ratchet disc 62, the front end of the stop also engages the ratchet teeth on the ratchet disc 62. At this time, the locking piece 7 is also pushed and engaged by the locking spring 71, and the brake protrusion 81 at the upper end of the brake pad 8 is also elastically pressed against the outer circumference of the ratchet disc 62 by the brake pad torsion spring 80. Therefore, since both the stop 5 and the locking piece 7 engage the ratchet disc 62, it is only necessary to reciprocate the lever 2 relative to the base 1 to drive the stop 5 and the locking piece 7 to alternately engage the ratchet disc 62, thereby driving the ratchet 6 to overcome the brake force and form a unidirectional intermittent forward rotation, that is... Figure 1 The counterclockwise rotation shown pulls the tightening straps, which are wound layer by layer onto the ratchet shaft 61, thereby securing the goods.

[0050] Moreover, the reciprocating motion of the lever 2 relative to the base 1 causes the positioning plate 511 to slide back and forth in the working arc groove 111, thereby forming the lever 2's stroke, that is, the forward and backward angle of the lever 2 can be limited by the stroke.

[0051] The second mode is the rapid tape ejection mode, specifically: pressing button 52 at the rear end of the stop component overcomes the decrease in torsion spring force, which causes the front end of the stop component to tilt upwards to disengage from the positioning groove 214, the working arc groove 111, and the ratchet of the ratchet disc 62. At this time, moving the lever 2 closer to the base 1 will cause the positioning plate 511 to move from the working arc groove 111 over the stop 113 and into the tape winding arc groove 112. Since the bottom of the tape winding arc groove is higher than the outer circumference of the ratchet disc 62, the positioning plate 511 is fitted with... Within the tape groove 112, the pressure applied to button 52 is ensured to disappear, preventing the front end of the stop from re-engaging the ratchet disc 62. At this time, the push protrusion 212 is also driven by the rotation of the lever 21, pushing the locking piece 7 and causing it to simultaneously disengage from the ratchet disc 62. Therefore, since both the stop 5 and the locking piece 7 are disengaged from the ratchet disc 62, the ratchet 6 is in an unrestrained state. Simply pulling the free end of the binding outward will cause the ratchet 6 to overcome the braking force and reverse direction. Figure 1 The clockwise rotation of the belt, as shown, quickly releases the tension strap, and the reverse rotation of the ratchet also simultaneously compresses the coil spring to accumulate potential energy.

[0052] The third state is the rapid winding state, which is as follows: When the ratchet 6 is in the state of releasing the tension strap, continue to move the lever 2 closer to the base 1, which will drive the arc edge 212 to slide and push the brake pad 8, thereby adjusting the braking force. When the braking force is greater than the potential energy, the brake pad 8 will still restrict the coil spring 41 from driving the ratchet 6 to rotate automatically. Only when the braking force is adjusted to be less than the potential energy will the coil spring 41 release the potential energy and drive the ratchet 6 to rotate automatically, thereby quickly winding the tension strap onto the ratchet shaft 61.

[0053] Obviously, the brake pad 8 of this utility model forms a braking force by elastically pressing the outer circumference of the ratchet disc 62. The outer circumference of the ratchet disc remains constant as it rotates. Therefore, even when the strap is fully pulled out of the ratchet 6 to its longest working position, the braking force can always be kept stable, even when the potential energy stored in the coil spring 41 is at its maximum.

[0054] In particular, the operation structure of the brake pad 8 described above does not require additional buttons or levers, making the overall structure simpler. By simply moving the lever 2 closer to the base 1 with one hand, the braking force can be adjusted synchronously by sliding the arc edge 212 to push the brake pad 8. Therefore, the operation process is quite convenient and effortless.

[0055] The basic principles and main features of this utility model have been described above. Those skilled in the art should understand that this utility model is not limited to the above embodiments. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the utility model as claimed. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A labor-saving ratchet strap tensioner, comprising a base (1), a base plate (11) at the front of the base, a lever (2), a lever plate (21) at the front of the lever, and a ratchet (6). The ratchet is composed of a ratchet shaft (61) and ratchet discs (62) coaxially fixed at both ends of the ratchet shaft. It also includes a fixing strap connected to the base (1) and a tensioning strap with one end wound around and connected to the ratchet shaft (61) and the other end being a free end for binding. The lever (2) is used to tighten the ratchet strap. The movable plate (21) and the base plate (11) of the base (1) are hinged to form a rotatable connection; the ratchet (6) is coaxially mounted with the actuation axis of the movable plate (21) via the ratchet shaft (61); the base (1) is provided with a locking member (7) for engaging or disengaging the ratchet disc (62), and a coil spring (41) is provided on the outside of the base (1); the actuation handle (2) is provided with a stop member (5) for engaging or disengaging the ratchet disc (62), characterized in that, The base (1) is also provided with a brake pad (8), which elastically presses against the outer circumference of the ratchet disc (62) to form a braking force; the bottom of the lever plate (21) is provided with an arc edge (213). When both the stop (5) and the latch (7) disengage from the ratchet disc (62), the free end of the binding is pulled outward, and the ratchet (6) overcomes the braking force to form a reverse rotation and quickly releases the tension strap. The reverse rotation of the ratchet (6) also synchronously drives the coil spring (41) to compress and accumulate potential energy. The lever (2) is closed and close to the base (1), and drives the arc edge (213) to slide and push the brake pad (8), thereby adjusting the braking force. When the braking force is greater than the potential energy, the brake pad (8) restricts the coil spring (41) from driving the ratchet (6) to rotate automatically. When the braking force is less than the potential energy, the coil spring (41) releases the potential energy and drives the ratchet (6) to rotate automatically, thereby quickly winding the tension strap onto the ratchet shaft (61).

2. The labor-saving ratchet strap tensioner according to claim 1, characterized in that... The stop (5) and the locking piece (7) both engage with the ratchet disc (62). The lever (2) reciprocates relative to the base (1) and drives the ratchet (6) to overcome the braking force and form a one-way intermittent forward rotation, thereby pulling the tensioning strap to be wound around the ratchet shaft (61).

3. The labor-saving ratchet strap tensioner according to claim 1, characterized in that... The front of the lever plate (21) is provided with a push protrusion (212). The lever handle (2) is engaged and close to the base (1), and drives the push protrusion (212) to push the locking piece (7) out of the ratchet disc (62).

4. The labor-saving ratchet strap tensioner according to claim 1, characterized in that... The stop (5) is pivotally installed in the lever (2) and forms a rocker-type rotating structure. The rear end of the stop is elastically pushed up and causes the front end of the stop to fall down, or the rear end of the stop is pressed down and causes the front end of the stop to rise up.

5. The labor-saving ratchet strap tensioner according to claim 1, characterized in that... The substrate (11) is provided with a tape winding arc groove (112) at the top, and the bottom of the arc groove is higher than the outer circumference of the ratchet disk (62); the stop (5) is provided with a positioning plate (511), which is fitted in the tape winding arc groove (112) and makes the stop (5) disengage from the ratchet disk (62).

6. A labor-saving ratchet strap tensioner according to claim 5, characterized in that... The base plate (11) is provided with a working arc groove (111) on the top. The working arc groove is located in front of the tape winding arc groove (112), and the bottom of the arc groove (111) is lower than the outer circumference of the ratchet disk (62). The positioning plate (511) is fitted in the working arc groove (111) and makes the stop (5) engage the ratchet disk (62). The lever (2) moves back and forth relative to the base (1) and drives the positioning plate (511) to slide back and forth in the working arc groove (111) to form a lever stroke.

7. A labor-saving ratchet strap tensioner according to claim 5, characterized in that... The top of the lever plate (21) is provided with a positioning groove (214), the bottom of which is lower than the outer circumference of the ratchet disc (62); the positioning plate (511) is fitted into the positioning groove (214).

8. A labor-saving ratchet strap tensioner according to claim 6, characterized in that... A stop (113) is provided between the working arc groove (111) and the winding arc groove (112); the stop (5) disengages from the ratchet disc (62), the lever (2) is engaged and close to the base (1), and drives the positioning plate (511) to pass over the stop (113) from the working arc groove (111) and enter the winding arc groove (112).

9. A labor-saving ratchet strap tensioner according to claim 1, characterized in that... The lower end of the brake pad (8) is hinged to the base (1), and the upper end of the brake pad is provided with a braking protrusion (81). The braking protrusion is elastically pushed against the outer circumference of the ratchet disc (62) to form a braking force.

10. A labor-saving ratchet strap tensioner according to claim 5, characterized in that... The stop (5) consists of a baffle (51) and a button (52) fixed on the back side of the baffle. The positioning plates (511) are respectively arranged on the front sides of the baffle (51). The rear sides of the baffle (51) are respectively provided with support plates (512), and the stop (5) is pivotally installed in the lever handle (2) via the support plates (512).

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