Effort-saving ratchet belt tensioner

Abstract

A power-saving ratchet strap tensioner comprising a base (1), a base plate (11) at the front region of the base, an operating handle (2), an operating plate (21) at the front region of the operating handle, and a ratchet (6), wherein the ratchet consists of a ratchet shaft (61) and ratchet discs (62) fastened coaxially to two ends of the ratchet shaft, and further comprises a fixing strap connected to the base (1) and a tensioning strap, one end of which is wrapped around the ratchet shaft (61) and the other end of which is a free binding end; wherein the operating handle (2) is actuated and rotatably connected to the base plate (11) of the base (1) by means of a hinge connection via the operating plate (21); wherein the ratchet (6) is rotatably mounted via the ratchet shaft (61) coaxially to the axis of rotation of the operating plate (21);wherein a locking member (7) is provided in the base (1), which engages with or disengages from the ratchet disc (62), wherein a spiral spring (41) is provided on the outside of the base (1); wherein a stop (5) is provided in the actuating handle (2), which engages with or disengages from the ratchet disc (62), characterized in that; wherein a brake shoe (8) is additionally provided in the base (1), which elastically presses against the outer circumference of the ratchet disc (62) and thus generates a braking force; wherein the bottom of the actuating plate (21) is provided with a curved edge (213); wherein, when the stop (5) and the locking member (7) both disengage from the ratchet disc (62), the free binding end is pulled outwards, whereby the ratchet (6) performs a reverse rotation against the braking force and thus quickly releases the tensioning belt, the spiral spring (41) being compressed by this reverse rotation of the ratchet (6) and storing potential energy;wherein the operating handle (2) is operated towards the base (1) and thereby pushes the curved edge (213) slidingly against the brake shoe (8) and thus regulates the braking force, wherein, when the braking force is greater than the potential energy, the brake shoe (8) limits the automatic forward rotation of the ratchet (6) under the drive by the coil spring (41), whereas, when the braking force is less than the potential energy, the coil spring (41) releases the stored energy and drives the ratchet (6) to automatic forward rotation, whereby the tensioning belt is quickly wound onto the ratchet shaft (61);

Description

FIELD OF UTILITY MODELThe utility model relates to a ratchet belt tensioner, specifically to a power-saving ratchet belt tensioner.PRIOR ARTCurrently, ratchet strap tensioners are generally used for cargo lashing. Its construction primarily comprises a base, a base plate at the front region of the base, an actuating handle, an actuating plate at the front region of the actuating handle, and a ratchet. In addition, the tensioner includes a fixing belt fixed to the base and a tensioning belt having one end wound around a ratchet shaft and the other end serving as a free binding end. A catch member and a coil spring are provided in the base for automatically winding a belt while the operating handle includes a stopper. The actuating handle is actuatable and rotatably connected to the base plate of the base by means of a hinged connection via the actuating plate, wherein the ratchet is rotatably arranged coaxially to the axis of rotation of the actuating plate. Upon simultaneous engagement of the stop and the latch member with the ratchet, reciprocating actuation of the actuating handle relative to the base by alternately engaging both components drives the ratchet to unidirectional intermittent rotation, thereby winding the tension strap; when the stop and the latch member both disengage from the ratchet, the ratchet rotates freely, thereby achieving either rapid release of the tension strap or automatic rewinding of the released tension strap on the ratchet by the coil spring for rapid winding function. At the same time, in order to avoid safety risks due to excessively rapid rolling up of the helical spring, a brake shoe is typically provided in the base. This brake shoe is resiliently pressed against the wound-up clamping belt and generates a braking force by friction between the brake shoe and the clamping belt. The strength of this braking force, however, varies with the thickness of the belt winding: the thinner the belt winding, the lower the braking force, the thicker the belt winding, the stronger the braking action. Consequently, the braking force cannot remain constant during the unrolling or reeling-up operation. In practical application, for example, a small belt winding thickness leads to a significantly reduced braking force of the brake shoe on the tensioning belt, while the potential energy stored in the spiral spring simultaneously reaches its maximum. In this state, the potential energy of the spiral spring exceeds the braking force acting on the tensioning belt, as a result of which the tensioning belt can hardly be reliably locked by the brake shoe at the maximum extension length of the tensioning belt when it is fully pulled out of the ratchet, since the potential energy of the spiral spring is greater than the braking force. In addition, driving the brake shoe to release the tightening strap typically requires a push button or an actuation button additionally provided on the base, which in practice requires that one hand move the actuation handle towards the base while the other hand is simultaneously to operate the brake shoe. This operation is cumbersome and force-intensive and the additional components such as push button or actuation button also significantly increase the complexity of the entire structure.DISCLOSURE OF UTILITY MODELThe present invention aims to overcome the technical deficiencies of existing systems by providing a force-saving ratchet strap tensioner that is characterized by structural simplification, user-friendly operability with minimal effort and ensuring a permanently stable braking force.According to the present invention, the object is achieved by the following configuration:A power saving ratchet strap tensioner comprising a base, a base plate at the front portion of the base, an operating handle, an operating plate at the front portion of the operating handle, and a ratchet, the ratchet consisting of a ratchet shaft and ratchet disks coaxially attached to two ends of the ratchet shaft, further comprising a fixing strap connected to the base and a tightening strap having one end wound around the ratchet shaft and the other end being a free binding band; wherein the operating handle is operable and rotatably connected to the base plate of the base via the operating plate via a hinge connection; wherein the ratchet is rotatably mounted via the ratchet shaft coaxially to the rotational axis of the operating plate; wherein the base has a detent member provided therein which engages or disengages the ratchet disc, wherein a coil spring is provided externally on the base; wherein the operating handle has a stopper provided therein which engages or disengages the ratchet disc, characterized in that the base has additionally provided therein a brake shoe which elastically presses against the outer periphery of the ratchet disc and thus generates a braking force; wherein the bottom of the operating plate is provided with a curved edge; wherein when the stopper and the detent member both disengage from the ratchet disc, the free binding band is pulled outwards, whereby the ratchet performs a reverse rotation against the braking force and thus releases the tensioning belt quickly, wherein the coil spring is compressed by this reverse rotation of the ratchet and stores potential energy; wherein the operating handle is operated toward the base thereby slidably pressing the bent edge against the shoe and thus regulating the braking force, wherein when the braking force is greater than the potential energy, the shoe limits the automatic forward rotation of the ratchet under the driving of the coil spring, while when the braking force is less than the potential energy, the coil spring releases the stored energy and drives the ratchet to an automatic forward rotation, thereby rapidly winding the tension belt onto the ratchet shaft.The stop and the catch both engage the ratchet disc, the actuating handle being actuated reciprocally relative to the base, thereby driving the ratchet to overcome the braking force and perform a unidirectional, intermittent forward rotation, thereby pulling and winding the tension strap onto the ratchet shaft.The front portion of the operating plate is provided with a abutting protrusion, the operating handle is operated toward the base and drives the abutting protrusion to push and disengage the ratchet member from the ratchet disk.The stopper is pivotally mounted in the operating handle and forms a rocker-like rotating structure, wherein the rear end of the stopper is elastically pushed up and thus the front end of the stopper is lowered, or wherein the rear end of the stopper is depressed and thus the front end of the stopper is raised.The base plate is provided at its upper surface with a winding arc groove whose curved groove bottom is higher than the outer periphery of the ratchet disc; the stopper is provided with a positioning plate installed in the winding arc groove and causing the stopper to disengage from the ratchet disc.The base plate is provided at its upper surface with a working arc groove which is located in front of the belt winding arc groove and whose curved groove bottom is lower than the outer periphery of the ratchet disc; the positioning plate is installed in the working arc groove and causes the stopper to engage with the ratchet disc; the operating handle is reciprocally operated relative to the base, thereby reciprocally sliding the positioning plate, thereby providing an operating path in the working arc groove.The actuating plate is provided on its upper side with a positioning groove, the groove base of which is lower than the outer periphery of the ratchet disc; the positioning plate being installed in the positioning groove.A locking protrusion is provided between the working arc groove and the belt winding arc groove; the stopper disengages from the ratchet disc and the operating handle is operated toward the base, whereby the positioning plate is moved from the working arc groove into the belt winding arc groove overcoming the locking protrusion.The lower end of the brake shoe is pivoted in the base, while the upper end of the brake shoe is provided with a braking protrusion which is elastically pressed against the outer periphery of the ratchet disc and thus generates a braking force.The stopper is composed of a stopper plate and a push button fixed to the rear side of the stopper plate, the positioning plate is disposed on both sides of the front portion of the stopper plate, respectively; both sides of the rear portion of the stopper plate are provided with a support plate, respectively; and the stopper is rotatably mounted in the operation handle by the support plate.In comparison with the prior art, in the present invention, a brake shoe is provided in the base, which resiliently presses against the ratchet disc of the ratchet to generate a braking force, and a bent edge is provided at the bottom of the operation plate. Upon simultaneous disengagement of the stop and the detent from the ratchet disc, the extension of the free binding end allows for a reverse rotation of the ratchet against the braking force, thereby quickly releasing the tension strap, while at the same time compressing the coil spring by this reverse rotation and storing potential energy. Since the brake shoe elastically presses the outer periphery of the ratchet disk to generate the braking force and the outer diameter of the ratchet disk remains unchanged during the rotation, this ensures a constant and stable braking force even when the tension belt is fully pulled out from the ratchet to the maximum extension length and the coil spring thereby stores its maximum potential energy. By operating the operating handle toward the base, the bent edge is slidably pushed against the brake shoe, thereby precisely regulating the braking force: when the set braking force exceeds the potential energy, the brake shoe limits the automatic forward rotation of the ratchet under the driving of the coil spring; when the braking force is reduced below the spring energy by the bent edge, the coil spring releases its stored energy and drives the ratchet for automatic forward rotation, thus rapidly winding the tension belt on the ratchet shaft. Obviously, this brake shoe control structure does not require any additional pushbuttons or operating buttons, thus greatly simplifying the overall construction. In particular, the one-handed operation by actuating the actuating handle in the direction of the base enables synchronous regulation of the braking force via the sliding of the bent edge against the brake shoe, which is simple and energy-saving.Illustration of the Utility ModelShown therein are FIG. 1 is a front view of the present invention; FIG. 2 is a rear view of FIG. 1 ; FIG. 3 is a plan view of FIG. 1; FIG. 4 shows a three-dimensional representation of FIG. 1 ; FIG. 5 is an exploded three-dimensional view of FIG. 4; FIG. 6 is a schematic structural view of a base; FIG. 7 shows a three-dimensional representation of FIG. 6 ; FIG. 8 is a schematic structural view of an operation handle; FIG. 9 shows a three-dimensional representation of FIG. 8 ; FIG. 10 is a schematic structural view of a stopper; FIG. 11 is a three-dimensional view of FIG. 10; FIG. 12 is a schematic structural view of a brake shoe; FIG. 13 is a schematic structural view of a ratchet; FIG. 14 is a schematic structural view of a core shaft; FIG. 15 is a schematic structural view of a protective case.CONCRETE EMBODIMENTSThe embodiment of the invention will be described in more detail with reference to the above drawings.As shown in FIGS. 1 to 15: 1stbase, 10th fixing rod, 11thbase plate, 111. Working arc groove, 112. Belt winding arc groove, 113. Locking protrusion, 114. Sliding groove, 2. actuation handle, 21. actuation plate, 211. calf-cup-shaped bore, 212. Abutting projection, 213. bent edge, 214. Positioning groove, 22nd grip guard, 3rd protective cover, 31st belt passage, 4th side cover, 41st coil spring, 42th guard ring, 5th stopper, 50th stopper spring, 51th stopper plate, 511. Positioning plate 512. Support plate, 52th Druckknopf, 6thRat, 61th Ratschen shaft, 62th Ratschen disk, 7th Rast member, 71th Spring, 72th Plate, 721. Guide bore, 8th brake shoe, 80th brake axle, 81th brake projection, 82th brake spring, 9th pin, 91th detent groove.A power saving ratchet strap tensioner as shown in Figs. 1-5 serves primarily to assist in the attachment and lashing of cargo. It comprises: a base 1, a base plate 11 at the front portion of the base, an operation handle 2, an operation plate 21 at the front portion of the operation handle, and a ratchet 6 consisting of a ratchet shaft 61 and ratchet disks 62 coaxially fixed to both ends of the ratchet shaft. Further, the tensioner includes a fixing belt (not shown in the drawings) fixed to the base 1, and a tensioning belt (not shown) having one end wound around the ratchet shaft 61 and the other end serving as a free binding end. In this embodiment, as shown in FIG. 1, the left side view corresponds to the front side of the ratchet tensioner, while the right side view is referred to as a rear portion or a rear side.The base 1, as shown in FIGS. 6 and 7, is a member having a U-shaped cross section and is composed of a base plate and two side plates bent vertically upward on both sides of the base plate. At the front ends of both side plates, a base plate 11 is arranged in each case, that is to say the base plates are structurally located in the front region of the base. Each base plate has a bearing bore in its center, the bearing bores of both base plates 11 lying exactly on a common horizontal axis line.The front portion of the base is provided with a plastics-made protective sheath 3 which serves to protect the base plate 11. The protective sheath has a strap passage 31, through which the free binding of the tensioning strap can be guided.The front portion of the base is additionally provided with a T-shaped latch member 7 which is specifically positioned inside the base 1 and is located in front of the ratchet 6. The two ends of the T-shaped latch member 7 are respectively mounted in the slide grooves 114 of the base plates 11 on two sides, while the T end of the latch member 7 is provided with an elastically urging latch spring 71. Specifically, both ends of the detent spring are slidably mounted on the detent member 7 and a detent plate 72 located inside the protective shell 3. In the normal state, the elastic pushing of the detent spring 71 causes the detent member 7 to constantly engage with the ratchet disk 62; only by an external force that pushes the detent member 7 along the slide grooves 114 against the elastic pushing force of the detent spring 71 can it be released from the ratchet disk 62. Thus, the state of movement of the detent member 7 depends on the actual operating requirements, whether it engages or disengages the ratchet disc 62. The latching plate 72 additionally has a guide bore 721 which ensures a stable movement sequence of the latching member 7.The rear portion of the base 1 is provided with a fixing rod 10 for connection to the fixing belt. In front of the fixing rod 10 there is provided a brake shoe 8, the lower end of which is mounted in the base 1 in an articulated manner via a brake axle 80, as a result of which the upper end of the brake shoe 8 is rotatable about the brake axle 80 and can thus approach the ratchet 6 or move away therefrom. The upper end of the brake shoe has a brake projection 81 which is elastically pressed against the outer periphery of the ratchet disc 62 by a brake spring 82 attached to the brake axle 80 and thus generates the braking force.The operating handle 2, as shown in FIGS. 8 and 9, is a member having an inverted U-shaped cross section and is composed of a top plate and two side plates. At the front ends of both side plates, an actuating plate 21 is arranged, whereby the actuating plates are located in the front region of the actuating handle. Each actuating plate 21 has a bearing bore in its center, the bores of both actuating plates being aligned exactly on a common horizontal axis line.In this way, the actuating handle 2 can be connected via the actuating plate 21 by means of the bearing bores in an articulated manner to the base plate 11 of the base 1, as a result of which an actuatable rotary connection of the actuating handle 2 relative to the base 1 is produced.The rear region of the actuating handle 2 is equipped with a plastic-manufactured handle guard 22, which enables a comfortable operation for the user. In the interior of the operating handle 2 is rotatably mounted a stop 5 which forms a rocker-like rotary structure and consists of a stop plate 51 and a push button 52 fastened to the rear side thereof.The stop plate 51 has a positioning plate 511 on each side on its front region and a support plate 512 on each side on its rear region. The positioning plates 511 and the supporting plates 512 together form an H-shaped structure of the entire stopper plate 51. The stop 5 is rotatably mounted in the operating handle 2 by means of the support plates 512, wherein the support plates 512 are mounted on two sides in each case in a calf-shaped bore 211 of the corresponding side of the operating handle 2. This forms a rocker-like structure that can pivot forward and rearward.In the normal state, the rear end of the stopper 5 is elastically pushed up by the stopper spring 50 installed in the operation handle 2, thereby lowering the front end of the stopper and typically engaging the lowered front end of the stopper with the ratchet disk 62. Alternatively, manual pressure on the push button 52 can overcome the spring force, resulting in lowering of the rear end and simultaneous raising of the front end. Now, the front end usually disengages from the ratchet disc 62, and thus the state of movement of the stopper 5 conforms to operational requirements by engaging or disengaging the ratchet disc 62. The push button 52 is also provided with an anti-slip pattern and an operation arrow, making the operation comfortable for the user.The ratchet 6 shown in FIG. 13 has a connecting groove on the ratchet shaft 61 that allows one end of the tension belt to be inserted and wound. The outer peripheries of the ratchet disks 62 at both ends are provided with ratchet teeth inclined in one and the same circumferential direction, and according to the orientation shown in FIG. 1, they are all inclined clockwise.The ratchet 6 is rotatably supported via the ratchet shaft 61 coaxially with the rotational axis of the operating plate 21. Specifically, the ratchet shaft 61 is formed as a hollow shaft having a double-D bore, and a mandrel 9, which is a solid double-D shaft matched to the double-D bore, is guided through the ratchet shaft. This allows the mandrel 9 and the ratchet 6 to rotate synchronously. The both ends of the mandrel 9 are inserted into the bearing holes of the base plate 11 and the operating plate 21, respectively, and are both rotatably supported and fixed by guard rings 42. Thus, the ratchet 6 rotates over the mandrel 9, its axis of rotation exactly coinciding with the axis of rotation of the operating handle 2.The base 1 is provided on both sides with side covers 4 which are fastened by snapping on and which close two ends of the mandrel 9 and thus ensure an optically appealing overall image. In this case, a spiral spring 41 is to be provided in one of the side covers 4, the inner end of which coil spring latches into a latching groove 91 of one end of the pin 9 and thus produces a connection. The outer end of the coil spring 41 is biased against the side cover 4. As a result, the rotation of the mandrel 9 under the drive of the ratchet 6 simultaneously causes a synchronous compression of the helical spring 41 for storing potential energy. Alternatively, the coil spring 41 can release potential energy and drive the mandrel 9 to rotate, as a result of which the ratchet 6 is rotated synchronously.In addition, the top surface of the base plate 11 has a working arc groove 111 and a belt winding arc groove 112, the working arc groove being positioned in front of the belt winding arc groove. Between the working arc groove 111 and the belt winding arc groove 112, a locking protrusion 113 is provided. The arcuate groove bottom of the working arc groove 111 is positioned below the outer periphery of the ratchet disc 62, while the arcuate groove bottom of the belt winding arc groove 112 is positioned above the outer periphery of the ratchet disc 62. As shown in FIG. 7, both base plates 11 have on their upper sides a working arc groove 111, a belt winding arc groove 112 and a locking projection 113, respectively. These structural elements are arranged in a positionally accurate symmetrical manner on both base plates 11 and have completely identical dimensions.The actuating plate 21 has a positioning groove 214 on its upper side, the groove base of which lies below the outer periphery of the ratchet disk 62. The positioning plate 511 of the stopper 5 can be installed in this positioning groove 214. A bent edge 213 is provided on the lower surface of the operation plate 21, while a cam-like abutting projection 212 is provided on the front portion of the operation plate 21. According to FIG. 9, these structural elements are designed mirror-symmetrically on both actuating plates 21 with identical dimensions.Thus, the described construction results in the ratchet belt tensioner having three operating states:The first operating state is the normal operating state: the rear end of the stopper in the operating handle 2 is elastically pushed up by the stopper spring 50, thereby lowering the front end of the stopper. This lowered front end of the stopper is simultaneously mounted in the positioning groove 214 and the working arc groove 111. Since the groove bases of the positioning groove 214 and the working arc groove 111 are located below the outer periphery of the ratchet disc 62, the front end of the stopper simultaneously engages with the teeth of the ratchet disc 62. Now, the detent member 7 is pushed by the detent spring 71 and engages with the teeth of the ratchet disc 62, while the brake protrusion 81 at the upper end of the brake shoe 8 is elastically pressed against the outer periphery of the ratchet disc 62 by the brake spring 80. Since both the stop 5 and the latching member 7 thus engage in the ratchet disc 62, a reciprocal actuation of the actuating handle 2 relative to the base 1 is sufficient to set the ratchet 6 against the braking force into a unidirectional, intermittent forward rotation (corresponding to the counterclockwise rotation shown in FIG. 1 ) via alternating engagement of the stop 5 and the latching member 7 in the ratchet disc 62. This process causes the tension belt to be wound layer by layer on the ratchet shaft 61 and thus enables the cargo to be tied up.In addition, the reciprocating operation of the operation handle 2 relative to the base 1 causes the positioning plate 511 to slide reciprocally within the work arc groove 111, thereby defining the operation path of the operation handle 2. Specifically, this means that the maximum forward and rearward operation angle of the operation handle 2 is limited by the path.The second working state is the quick-rolling state: by pressing the push button 52 at the rear end of the stopper, the spring force is overcome and the rear end is lowered, whereby the front end is raised to disengage from the positioning groove 214, the working arc groove 111 and the teeth of the ratchet disc 62. When the operation handle 2 is now operated toward the base 1, the positioning plate 511 moves from the working arc groove 111 beyond the locking protrusion 113 into the belt winding arc groove 112. Since the groove bottom of the belt winding arc groove is located above the outer periphery of the ratchet disc 62, the front end of the stopper remains disengaged from the ratchet disc 62 even after releasing the push button 52 by installing the positioning plate 511 in the belt winding arc groove 112. At the same time, the abutting projection 212 moved by the rotation of the operating plate 21 pushes and disengages the ratchet member 7 synchronously from the ratchet disc 62, and thus, since both the stopper 5 and the ratchet member 7 are disengaged from the ratchet disc 62 and the ratchet 6 is not limited, simply pulling out the free binding band causes the ratchet 6 to rotate backward against the braking force according to the clockwise rotation shown in FIG. 1, thereby quickly releasing the tightening strap. This reverse rotation of the ratchet synchronously compresses the coil spring and stores potential energy.The third working state is the quick-winding state: When the ratchet 6 has released the tightening strap and the operating handle 2 is further operated toward the base 1, the bent edge 212 slidably presses against the brake shoe 8 and thus regulates the braking force. When the braking force exceeds the potential energy, the brake shoe 8 continues to restrict the automatic forward rotation of the ratchet 6 under the driving of the coil spring 41. Only when the braking force is reduced below the potential energy, the coil spring 41 releases its stored energy and drives the ratchet 6 to automatically rotate forward, thereby rapidly winding the tension belt onto the ratchet shaft 61.Obviously, in the invention, the braking force is generated by the brake shoe 8 which presses elastically against the outer periphery of the ratchet disc 62. Since the circumferential dimension of the ratchet disk remains unchanged during the entire rotational movement, this ensures a permanently stable braking force even if the tension belt is completely unwound from the ratchet 6 up to the maximum extension length and the spiral spring 41 stores its maximum potential energy in the process.It should be emphasized in particular that this operating structure of the brake shoe 8 does not require additional buttons or buttons, which substantially simplifies the overall structure. By merely operating the operating handle 2 with one hand toward the base 1, the braking force is synchronously regulated by the sliding of the brake shoe 8 over the bent edge 212. This ensures a very comfortable and force-saving operating operation.The basic principle and the main features of the utility model have been described so far. It will be understood by those skilled in the art that the present invention is by no means limited by the above embodiments. Without departing from the spirit and scope of the invention, various modifications and improvements are conceivable to the invention, which should fall below the scope of the invention as claimed. The claimed scope of the invention is defined by the appended claims and their equivalents.

Claims

A power saving ratchet belt tensioner comprising a base (1), a base plate (11) at the front portion of the base, an operation handle (2), an operation plate (21) at the front portion of the operation handle, and a ratchet (6), the ratchet consisting of a ratchet shaft (61) and ratchet disks (62) coaxially fixed to two ends of the ratchet shaft, further comprising a fixing belt connected to the base (1), and a tightening belt having one end wound around the ratchet shaft (61) and the other end being a free binding; wherein the operation handle (2) is operable and rotatably connected to the base plate (11) of the base (1) via the operation plate (21) by means of a hinge connection; wherein the ratchet (6) is rotatably mounted via the ratchet shaft (61) coaxially with the rotational axis of the operating plate (21); wherein a catch member (7) is provided in the base (1) which engages with or disengages from the ratchet disc (62), wherein a coil spring (41) is provided on the outside of the base (1); wherein a stop (5) is provided in the operating handle (2) which engages with or disengages from the ratchet disc (62), characterized in that a brake shoe (8) is additionally provided in the base (1) which presses elastically against the outer periphery of the ratchet disc (62) and thus generates a braking force; wherein the bottom of the operating plate (21) is provided with a curved edge (213); wherein, when the stopper (5) and the ratchet member (7) both disengage from the ratchet disk (62), the free binding is pulled outward, whereby the ratchet (6) performs a reverse rotation against the braking force and thus releases the tension belt quickly, the helical spring (41) being compressed by this reverse rotation of the ratchet (6) and storing potential energy; wherein the operating handle (2) is operated toward the base (1) thereby slidably pressing the bent edge (213) against the brake shoe (8) and thus regulating the braking force, wherein when the braking force is larger than the potential energy, the brake shoe (8) limits the automatic forward rotation of the ratchet (6) under the driving of the coil spring (41), while when the braking force is smaller than the potential energy, the coil spring (41) releases the stored energy and drives the ratchet (6) to an automatic forward rotation, whereby the tension belt is rapidly wound on the ratchet shaft (61).A power saving ratchet belt tensioner according to claim 1, characterized in that the stopper (5) and the catch member (7) both engage the ratchet disk (62), the operating handle (2) being reciprocally operated relative to the base (1) and thereby driving the ratchet (6) to overcome the braking force and perform a unidirectional intermittent forward rotation, thereby pulling and winding the clamping belt on the ratchet shaft (61).The power saving ratchet belt tensioner according to claim 1, characterized in that the front portion of the operating plate (21) is provided with a abutting protrusion (212), the operating handle (2) is operated toward the base (1) and drives the abutting protrusion (212) to push and disengage the ratchet member (7) from the ratchet disk (62).A power saving ratchet strap tensioner according to claim 1, characterized in that the stop (5) is pivotally mounted in the operating handle (2) and forms a rocker-like pivot structure, wherein the rear end of the stop is elastically pushed up and thus the front end of the stop is lowered, or wherein the rear end of the stop is depressed and thus the front end of the stop is raised.The power saving ratchet tensioner according to claim 1, characterized in that the base plate (11) is provided at its top with a belt winding arc groove (112) whose curved groove bottom is higher than the outer periphery of the ratchet disk (62); wherein the stopper (5) is provided with a positioning plate (511) installed in the belt winding arc groove (112) and causing the stopper (5) to disengage from the ratchet disk (62).The power saving ratchet tensioner according to claim 5, characterized in that the base plate (11) is provided at its top with a working arc groove (111) located in front of the belt winding arc groove (112) and having its curved groove bottom lower than the outer periphery of the ratchet disk (62); the positioning plate (511) is installed in the working arc groove (111) and causes the stopper (5) to engage with the ratchet disk (62); the operation handle (2) is reciprocally operated relative to the base (1) thereby reciprocally sliding the positioning plate (511), thereby providing an operation path in the working arc groove (111).The power saving ratchet belt tensioner according to claim 5, characterized in that the actuating plate (21) is provided on its upper surface with a positioning groove (214) whose groove bottom is lower than the outer periphery of the ratchet disk (62); wherein the positioning plate (511) is installed in the positioning groove (214).The power saving ratchet strap tensioner according to claim 6, characterized in that a locking protrusion (113) is provided between the working arc groove (111) and the strap winding arc groove (112); wherein the stopper (5) disengages from the ratchet disk (62) and the operating handle (2) is operated toward the base (1), whereby the positioning plate (511) is moved from the working arc groove (111) into the strap winding arc groove (112) overcoming the locking protrusion (113).A power saving ratchet belt tensioner according to claim 1, characterized in that the lower end of the brake shoe (8) is hinged in the base (1), while the upper end of the brake shoe is provided with a brake protrusion (81) which is elastically pressed against the outer periphery of the ratchet disc (62) and thus generates a braking force.The power saving ratchet belt tensioner according to claim 9, characterized in that the stopper (5) is composed of a stopper plate (51) and a push button (52) fixed to the back side of the stopper plate, the positioning plate (511) is disposed on both sides of the front portion of the stopper plate (51), respectively; the both sides of the back portion of the stopper plate (51) are provided with a support plate (512), respectively; and the stopper (5) is rotatably mounted in the operation handle (2) by the support plate (512).

Images