Small-grip quick-release pliers with locking function

Abstract

Provided is a small-grip quick-clamping type hand pliers with a locking function, comprising a plier body, a tensioning and locking mechanism, a rack and pinion transmission mechanism, a pulley block mechanism, a tensioning assembly, a reversing wheel, an upper jaw, a lower jaw, and a rear tensioning handle; the tensioning and locking mechanism moves along the upper side of the plier body along a guide, the rack and pinion transmission mechanism and the pulley block mechanism are arranged on the lower side of the plier body and are connected through a guide plate, the steel wire rope in the pulley block mechanism is connected to the tensioning and locking mechanism through the tensioning assembly and the reversing wheel, and the rear tensioning handle is connected to the tensioning assembly through a pull rope. The rack and pinion transmission mechanism, the pulley block mechanism, the tensioning and locking mechanism, and the rear tensioning handle for auxiliary tensioning and strengthening are integrated on the plier body, so that small-grip input, large-clamping-force output, quick clamping, automatic locking, and convenient unlocking can be realized, the overall structure is compact, movement is stable, clamping is firm, and the pliers are suitable for narrow-space operation, and the problems of large gripping force, no locking, large size, and inconvenient operation of traditional hand pliers are solved.

Description

Technical Field

[0001] This invention belongs to the field of manual clamping tools, specifically relating to a small-grip quick-clamping pliers with a locking function. Background Technology

[0002] Pliers, as a commonly used hand clamping tool, are widely used in many fields such as mechanical repair, hardware processing, daily life, and outdoor fishing. Their core function is to convert the operator's hand gripping force into the clamping force of the jaws through structural design, so as to achieve operations such as clamping, fixing or cutting workpieces.

[0003] Existing pliers generally employ a hinged connection structure, operating on the lever principle. This structure amplifies the gripping force applied by the hand, converting it into a clamping force on the workpiece. In practical use, to further increase the amplification of gripping force to meet the demands of high clamping force, the length of the pliers' gripping portion (i.e., the handle) is typically increased to lengthen the lever arm, thereby further amplifying the force. However, this method has several drawbacks, specifically: First, lengthening the handle increases the overall length of the pliers, thus... The increased opening and closing range of the pliers' gripping parts makes clamping operations less convenient and reduces operational flexibility. Secondly, the increased overall length of the pliers reduces their spatial adaptability, making them unsuitable for confined work environments and limiting their applicability. Thirdly, when clamping large objects, the operator needs to hold the end of the pliers handle, resulting in a greater distance between the hand and the object being clamped. This requires the operator to apply greater force to achieve stable clamping, which can easily lead to fatigue and strenuous operation over time. Therefore, improvements are necessary to address these technical problems. Summary of the Invention

[0004] The technical problem solved by this invention is to provide a small-grip, quick-clamping pliers with a locking function. It employs a rack and pinion transmission mechanism integrated into the pliers body, a pulley system connected to the rack and pinion transmission mechanism, a tensioning and locking mechanism connected to the pulley system, and a rear tensioning handle for enhanced tension. This allows for the output of a large clamping force from the upper and lower jaws with only a small gripping force input. It provides rapid clamping while automatically locking and reinforcing the clamping action. This solves the problems of traditional pliers being large, requiring continuous force, and having unreliable clamping capabilities. It is flexible in operation, highly adaptable to different spaces, and saves time and effort. It is particularly suitable for long-term fixing, assembly, clamping, welding positioning, and fishing scenarios, offering a wide range of applications and higher versatility and clamping reliability.

[0005] The technical solution adopted in this invention is: a small-grip quick-clamping pliers with locking function, including a pliers body. A tensioning and locking mechanism is installed inside the pliers body and is adapted to and connected to its upper edge and moves along the length direction of the upper edge. A rack and pinion transmission mechanism and a pulley block mechanism are located on both sides below the tensioning and locking mechanism inside the pliers body. The linear motion end of the rack and pinion transmission mechanism and the moving end of the pulley block mechanism are connected to each other and guided and installed on the pliers body. The rotating end of the rack and pinion transmission mechanism is connected to the upper and lower jaws distributed on the left end of the pliers body. When the linear motion end of the rack and pinion transmission mechanism moves to the left or right, it controls the upper and lower jaws to open or clamp. The clamp body is internally guided and installed with a tensioning component that slides left and right along its length and is located on the right side of the pulley block mechanism, and a reversing wheel that is rotatably installed in the clamp body and is located on the left side of the tensioning locking mechanism. The wire rope in the pulley block mechanism is connected to the tensioning locking mechanism via the tensioning component and the reversing wheel, and the clamping control of the upper and lower jaws is achieved by pulling the tensioning locking mechanism to the right. The lower right end of the clamp body is rotatably equipped with a rear tensioning handle, and the upper end of the rear tensioning handle is connected to the tensioning component via a pull rope. The tensioning component is moved to the right by pulling the rear tensioning handle to achieve enhanced clamping of the upper and lower jaws.

[0006] The clamp body has corresponding waist-shaped elongated holes on its front and rear outer walls. The linear motion end of the rack and pinion transmission mechanism is pinned to one end of the guide plate that is slidably adapted to the waist-shaped elongated holes on both sides of the clamp body, and the moving end of the pulley block mechanism is connected to the other end of the two guide plates.

[0007] Furthermore, the rack and pinion transmission mechanism includes a rack plate, two gears distributed vertically and rotatably mounted on the left end of the clamp body, and a tension spring. The two gears, as well as the upper and lower jaws on their right ends that rotate synchronously with the two gears, are rotatably mounted on the left end of the clamp body. The left end of the rack plate is located between the two gears, and the teeth on the upper and lower plates on its left end mesh with the two gears. The left end of the tension spring is hooked into the clamp body, and the other end of the tension spring is hooked into the left side wall of the U-shaped block with its slot facing downward, which is fixed on the right bottom surface of the rack plate. When the rightward tension of the rack plate is released, the tension spring controls the rack plate to move to the left and reset. The U-shaped block on the right bottom surface of the rack plate is pinned to one end of the two guide plates by a connecting pin.

[0008] Furthermore, the pulley block mechanism includes a wire rope, a movable pulley block, and a stationary pulley block. The two ends of the rotating shaft of the movable pulley block are connected to the other end of the corresponding side guide plate. The stationary pulley block is rotatably installed inside the clamp body. One end of the wire rope is fixed to the inner wall of one side of the clamp body, and the other end of the wire rope passes through the movable pulley block, the stationary pulley block, the tensioning assembly, and the reversing wheel in sequence and is fixedly connected to the tensioning locking mechanism.

[0009] Furthermore, the tensioning locking mechanism includes a front tensioning handle, a cam handle, an arm, a second tension spring, a pawl, and a slider. The lower end of the front tensioning handle is adapted to and fixed to the protrusion in the middle of the upper end face of the slider. The right end of the arm is located in the groove in the upper end face of the protrusion. The upper end faces of the front and rear side plates of the clamp body are provided with clamp body racks, and the pawls located on the front and rear sides of the lower end of the front tensioning handle mesh with the clamp body racks on the same side. The right end of the arm and the two pawls are fixedly connected to a pin shaft 1 that is rotatably connected to the front tensioning handle and the protrusion in the upper end face of the slider. The left end of the arm is located in the connecting groove in the middle of the cam at the lower end of the cam handle, and the hanging ring at the upper end of the second tension spring is located in the connecting groove in the middle of the left end of the arm. The cam at the lower end of the cam handle and the hanging ring at the upper end of the arm and the second tension spring are rotatably connected by the second pin shaft. By pulling the handle at the upper end of the cam handle to the right, the pawls are disengaged from the clamp body racks. The inner walls of the front and rear side plates of the clamp body are provided with corresponding guide grooves, and the guide protrusions on both sides of the slider located between the front and rear side plates of the clamp body are adapted to the guide grooves on the same side. The slider is provided with a pin three, and the lower end of the tension spring two that passes through the U-shaped groove at the upper left end of the clamp body rack is hung on the pin three. When the tension of the upper handle of the cam handle is released by pushing it to the right, the cam handle is pulled to the left and reset under the action of the tension spring two, so as to realize the engagement and locking of the pawl and the clamp body rack. The other end of the steel wire rope is fixed to the slider.

[0010] Furthermore, the tensioning assembly includes a tensioning wheel and a connecting rod. The front and rear side walls of the right end of the clamp body are both provided with corresponding waist-shaped grooves. The upper half of the tensioning wheel is located in the mounting hole on the upper right end face of the clamp body, and the milled flat portions at both ends of the tensioning wheel shaft are slidably adapted to the waist-shaped grooves on the same side. The left end of the connecting rod is rotatably connected to the shaft of the tensioning wheel, and the right end of the connecting rod is connected to the left end of the pull rope.

[0011] Furthermore, the rear tensioning handle is a V-shaped structure formed by two outwardly opening arc-shaped rods. The lower right side of the clamp body is provided with a handle groove that matches the left rod of the rear tensioning handle. The rotating pin at the middle corner of the rear tensioning handle is connected to the clamp body, and the upper end of the rear tensioning handle located inside the clamp body is connected to the right end of the pull rope.

[0012] Furthermore, the upper and lower claws have an arc-shaped structure, and the left end of the upper and lower claws has several interlocking teeth.

[0013] Advantages of this invention compared to existing technologies: 1. This technical solution adopts a rack and pinion transmission mechanism formed by the meshing of a rack plate and a gear. With the connection structure in which the upper and lower jaws rotate synchronously with the corresponding gears, the left and right movement of the rack plate directly drives the synchronous opening and closing of the upper and lower jaws. The transmission structure is compact, and the jaws can be quickly clamped by pulling the front tensioning handle. It has a rapid response, accurate positioning, and improves operating efficiency. 2. This technical solution adopts a force-saving pulley mechanism consisting of a moving pulley block and a stationary pulley block, combined with a flexible transmission connection of steel wire rope. It can obtain a multiplied clamping force with a small operating pull force, greatly reducing the load on the operator's hands. Even during long-term operation, it is not easy to get tired, significantly improving the comfort of use and work efficiency. It solves the problem that the greater the clamping force of traditional hand pliers, the greater the gripping force required. 3. The tensioning and locking mechanism of this technical solution adopts a one-way meshing self-locking structure with the pawl and the toothed rack of the clamp body. It automatically locks after the upper and lower pawls clamp, and can maintain the clamping state for a long time without continuous application of gripping force. It does not spring back or loosen, which meets the long-term clamping requirements for assembly, positioning, and fixing, and overcomes the defects of traditional hand pliers that cannot self-lock and are easy to loosen. 4. This technical solution adopts a structure in which the cam handle and the arm drive the pawl to lift or fall, so that one-button unlocking can be achieved by lightly turning the cam handle. The operation is simple and there is no jamming. After the tension locking mechanism is unlocked, the rack plate automatically resets under the action of the tension spring, and the jaws open quickly. The overall action is smooth and convenient for continuous operation. 5. This technical solution, with the pulley block mechanism and tensioning component connected, further tensions the wire rope by setting a two-stage force-increasing structure formed by connecting the rear tensioning handle and the tensioning component, on the basis of self-locking clamping, thereby strengthening the clamping force at both ends and realizing a dual mode of rapid pre-clamping and strong enhanced clamping, which meets the working conditions of heavy load and large clamping force, and has a wider range of applications. 6. This technical solution has a reasonable structural design and a compact overall size, which can be used normally in confined environments such as narrow spaces, inside equipment, and in small installation positions, breaking through the limitations of traditional long-handled pliers in terms of poor space adaptability; it is easy to use and suitable for operators of different ages and strengths, making it applicable to a wider range of scenarios. Attached Figure Description

[0014] Figure 1 This is an exploded structural diagram of the present invention; Figure 2 This is a schematic diagram of the assembly structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the present invention; Figure 4 This is a cross-sectional view of the tensioning and locking mechanism of the present invention. Detailed Implementation

[0015] The following will be based on embodiments of the present invention. Figure 1-4 The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0016] It should be noted that, unless otherwise stated herein, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] In this document, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0018] Small grip quick-clamp pliers with locking function, such as Figure 1-4 As shown, the device includes a clamp body 1, which is an integral load-bearing body with a hollow cavity inside. The upper end and both sides are open for mounting various transmission and actuation mechanisms. A tensioning and locking mechanism 2 is guided and installed along the upper edge of the clamp body 1. The tensioning and locking mechanism 2 can move left and right along the length of the clamp body 1 and forms an adaptive connection with the upper edge of the clamp body 1. The tensioning and locking mechanism 2, which is adapted to and connected to the upper edge of the clamp body 1 and moves along the length of the upper edge, is guided and installed inside the clamp body 1. A rack and pinion transmission mechanism 3 and a pulley block mechanism 4 are located on both sides below the tensioning and locking mechanism 2. The linear motion end of the rack and pinion transmission mechanism 3 and the moving end of the pulley block mechanism 4 are interconnected and guided and installed on the clamp body 1 to ensure synchronous linear motion. The rotating end of the rack and pinion transmission mechanism 3 is connected to the upper jaw 7 and lower jaw 8, which are distributed vertically on the left end of the clamp body 1. When the linear motion end of the rack and pinion transmission mechanism 3 moves left or right, it controls the upper jaw 7 and lower jaw 8 to open or clamp synchronously. The clamp body 1 is internally guided and installed with a tensioning component 5 that slides left and right along its length and is located on the right side of the pulley block mechanism 4, and a reversing wheel 6 that is rotatably installed inside the clamp body 1 and located on the left side of the tension locking mechanism 2. The reversing wheel 6 is used to change the transmission direction of the wire rope 4-1, while the tensioning component 5 not only has the function of changing the transmission direction of the wire rope 4-1, but can also slide left and right, providing conditions for the enhanced clamping of the upper jaw 7 and the lower jaw 8. The wire rope 4-1 in the pulley block mechanism 4 is connected to the tension locking mechanism 2 through the tensioning component 5 and the reversing wheel 6, and the clamping control of the upper jaw 7 and the lower jaw 8 is achieved by pulling the tension locking mechanism 2 to the right. The lower right end of the clamp body 1 is rotatably mounted with a rear tensioning handle 9, and the upper end of the rear tensioning handle 9 is connected to the tensioning component 5 through a pull rope 10. The tensioning component 5 is moved to the right by pulling the rear tensioning handle 9, thereby achieving enhanced clamping of the upper jaw 7 and the lower jaw 8.

[0019] As shown in 1-3, the outer walls of the front and rear sides of the clamp body 1 are provided with corresponding waist-shaped elongated holes 12. The waist-shaped elongated holes 12 extend along the length of the clamp body 1. The linear motion end of the rack and pinion transmission mechanism 3 is pinned to one end of the guide plate 11 that is slidably adapted to the waist-shaped elongated holes 12 on both sides of the clamp body 1. The moving end of the pulley block mechanism 4 is connected to the other end of the two guide plates 11. The matching structure between the waist-shaped elongated holes 12 and the guide plates 11 provides stable linear guidance for the rack and pinion transmission mechanism 3 and the pulley block linear drive mechanism 4, restricting them to move only in the left and right directions, and avoiding shaking and deflection.

[0020] The above structure employs a rack and pinion transmission mechanism 3 integrated on the clamp body 1 and adapted to connect the upper jaw 7 and the lower jaw 8, a pulley block mechanism 4 connected to the rack and pinion transmission mechanism 3, a tensioning and locking mechanism 2 connected to the pulley block mechanism 4, and a rear tensioning handle 9 for assisting in tensioning and strengthening. This allows for the output of large clamping force from the upper jaw 7 and the lower jaw 8 with a small gripping force input. It provides rapid clamping while also having automatic locking and enhanced clamping functions. This solves the problems of traditional hand pliers being large in size and requiring continuous force, as well as unreliable clamping. It is flexible in operation, highly adaptable to space, and saves time and effort. It is particularly suitable for long-term fixing, assembly, clamping, welding positioning, and fishing scenarios. It has a wide range of applications and higher versatility and clamping reliability. The specific structure of the rack and pinion transmission mechanism 3 is as follows: The rack and pinion transmission mechanism 3 includes a rack plate 3-1, two gears 3-2 distributed vertically and rotatably mounted on the left end of the clamp body 1, and a tension spring 3-3. The two gears 3-2 and the upper jaw 7 and lower jaw 8, which rotate synchronously with the two gears 3-2 on their right ends, are rotatably mounted on the left end of the clamp body 1. The gears 3-2 are keyed to a short shaft, while the upper jaw 7 and lower jaw 8 are keyed to the corresponding short shafts on their right ends. The short shafts are rotatably connected to the clamp body 1, enabling the gears 3-2 to drive the short shafts to rotate, thereby causing the upper jaw 7 and lower jaw 8 to rotate synchronously by their corresponding rotating shafts. The left end of the rack plate 3-1 is located between the two gears 3-2, and the teeth on the upper and lower plates on its left end are connected to the two gears. 3-2 meshes to form a rack and pinion transmission pair; the left end of the tension spring 3-3 is hooked inside the clamp body 1, and the clamp body 1 is provided with a pin located below the rack plate 3-1, and the left end of the tension spring 3-3 is hooked on the pin, and the other end of the tension spring 3-3 is hooked on the left side wall of the U-shaped block with the slot facing down fixed on the right bottom surface of the rack plate 3-1. A hook is fixed on the left side wall of the U-shaped block, and the other end of the tension spring 3-3 is hooked on the hook. When the pulling force of the rack plate 3-1 is released to the right, the tension spring 3-3 controls the contraction to pull the rack plate 3-1 to the left to reset, thereby driving the upper claw 7 and the lower claw 8 to open synchronously; the U-shaped block on the right bottom surface of the rack plate 3-1 is connected to one end of the two guide plates 11 by a connecting pin to realize the linkage with the pulley block mechanism 4.

[0021] The specific structure of the pulley block mechanism 4 is as follows: The pulley block mechanism 4 includes a wire rope 4-1, a movable pulley block 4-2, and a stationary pulley block 4-3. The two ends of the rotating shaft of the movable pulley block 4-2 are connected to the other end of the corresponding side guide plate 11, and move linearly synchronously with the guide plate 11. The stationary pulley block 4-3 is rotatably installed inside the clamp body 1 and remains stationary. One end of the wire rope 4-1 is fixed to the inner wall of one side of the clamp body 1, and the other end of the wire rope 4-1 passes through the movable pulley block 4-2, the stationary pulley block 4-3, the tensioning component 5, and the reversing wheel 6 in sequence and is fixedly connected to the tensioning locking mechanism 2. The movable pulley block 4-2 and the stationary pulley block 4-3 cooperate to form a force-saving transmission system, which can greatly reduce the hand operating force and realize the large clamping force driven by small grip force.

[0022] The tensioning locking mechanism 2 has the following specific structure: The tensioning locking mechanism 2 includes a front tensioning handle 2-1, a cam handle 2-2, an arm 2-3, a tension spring 2-12, pawls 2-4, and a slider 2-5. The lower end of the front tensioning handle 2-1 is fitted to and fixed to the upper end face of the slider 2-5 with a protrusion in the middle. The right end of the arm 2-3 is located in the groove on the upper end face of the protrusion. The upper end faces of the front and rear side plates of the clamp body 1 are each provided with a clamp body rack 2-6. The pawls 2-4 located on the front and rear sides of the lower end of the front tensioning handle 2-1 mesh with the clamp body rack 2-6 on the same side, forming a one-way locking structure. The right end of the arm 2-3 and the two pawls 2-4 are rotatably connected. The upper end of the tension handle 2-1 and the upper end of the slider 2-5 are fixedly connected by a pin 2-7, so that the arm 2-3 and the two pawls 2-4 rotate synchronously with the pin 2-7 around its axis. The left end of the arm 2-3 is located in the connecting groove in the middle of the cam at the lower end of the cam handle 2-2, and the hanging ring at the upper end of the tension spring 2-12 is located in the connecting groove in the middle of the left end of the arm 2-3. The cam at the lower end of the cam handle 2-2 and the hanging ring at the upper end of the arm 2-3 and the tension spring 2-12 are connected by a pin 2-8 to form a linkage unlocking structure. By pulling the handle at the upper end of the cam handle 2-2 to the right, the cam drives the arm 2-3 and the pin 2-8 to rotate, which drives the pawl 2-4 to lift upward. The pawl 2-4 disengages from the clamp rack 2-6, thus unlocking the arm. The clamp body 1 has guide grooves 2-9 on the inner walls of its front and rear side plates, and guide protrusions 2-10 on the side walls of the slider 2-5 located between the front and rear side plates of the clamp body 1 are adapted to the guide grooves 2-9 on the same side to ensure the smooth movement of the slider 2-5. The slider 2-5 is provided with a pin 2-11, and the lower end of the tension spring 2-12, which passes through the U-shaped groove at the upper left end of the clamp body rack 2-6, is hung on the pin 2-11. When the external force of turning the cam handle 2-2 to the right is eliminated, the tension spring 2-12 retracts and pulls the cam handle 2-2 to the left to reset, driving the pawl 2-4 to reset downward and re-engage with the clamp body rack 2-6 to achieve automatic locking. The other end of the wire rope 4-1 is fixed to the slider 2-5 and moves synchronously with the slider 2-5. The slider 2-5 has a groove-shaped block structure with the groove opening facing downward. The specific structure of the tensioning assembly 5 is as follows: The tensioning assembly 5 includes a tensioning wheel 5-1 and a connecting rod 5-2. The front and rear side walls of the right end of the clamp body 1 are provided with corresponding waist-shaped grooves 5-3. The waist-shaped grooves 5-3 extend along the length of the clamp body 1. The upper part of the tensioning wheel 5-1 is located in the mounting hole on the upper right end face of the clamp body 1, and the milled flat parts at both ends of the shaft of the tensioning wheel 5-1 are slidably adapted to the waist-shaped grooves 5-3 on the same side, and can slide left and right along the waist-shaped grooves 5-3. The left end of the connecting rod 5-2 is rotatably connected to the shaft of the tensioning wheel 5-1, and the right end of the connecting rod 5-2 is connected to the left end of the pull rope 10. The rear tensioning handle 9 pulls the connecting rod 5-2 through the pull rope 10, thereby driving the tensioning wheel 5-1 to move to the right, thereby pulling the movable pulley group 4-2 to the right through the tensioned wire rope 4-1.

[0023] The specific structure of the rear tensioning handle 9 is as follows: The rear tensioning handle 9 is an integrated V-shaped structure formed by two outwardly opening arc rods. The lower right side of the clamp body 1 is provided with a handle groove 13 that is adapted to the left side rod of the rear tensioning handle 9, so that the rear tensioning handle 9 can be stored in the handle groove 13. The rotating pin at the middle corner of the rear tensioning handle 9 is connected to the clamp body 1 to form a lever fulcrum. The upper end of the rear tensioning handle 9, located inside the clamp body 1, is connected to the right end of the pull rope 10. When the rear tensioning handle 9 is clamped, the right side rod of the rear tensioning handle 9 pulls the pull rope 10 with the middle pin connection position as the fulcrum, thereby driving the tensioning component 5.

[0024] The upper jaw 7 and lower jaw 8 have an arc-shaped structure, which makes it easy to clamp round pipes and cylindrical workpieces. The left end of the upper jaw 7 and lower jaw 8 has several interlocking teeth, which can increase the clamping friction, make it easier to clamp small workpieces or ropes, prevent slippage, and improve clamping stability.

[0025] Initially, rack plate 3-1 is in its initial left position under the action of tension spring 3-3, with upper jaw 7 and lower jaw 8 in the open state. Tensioning locking mechanism 2, under the action of tension spring 2-12, engages pawl 2-4 with the clamp rack 2-6, remaining in a standby locked state. During rapid clamping, grip the front tensioning handle 2-1 and pull it to the right, simultaneously moving slider 2-5 to the right, pulling wire rope 4-1. Wire rope 4-1 drives guide plate 11 to the right via movable pulley group 4-2 and stationary pulley group 4-3, which in turn moves rack plate 3-1 to the right. The rightward movement of rack plate 3-1 drives gear 3-2 to rotate, causing upper jaw 7 and lower jaw 8 to... The workpiece is clamped synchronously. When the clamping is strengthened, if a greater clamping force is required, the tension handle 9 is clamped and pulled by the pull rope 10 to move the connecting rod 5-2 and the tension wheel 5-1 to the right, further tensioning the wire rope 4-1, increasing the transmission tension, and improving the clamping force of the jaws to achieve strong clamping. When unlocking and resetting, the cam handle 2-2 is pulled to the right, the cam drives the arm 2-3 to swing, and the pawl 2-4 swings synchronously to disengage from the jaw rack 2-6, completing the unlocking. At this time, the tension locking mechanism 2 can slide to the left. When the external force on the cam handle 2-2 is eliminated, under the action of the tension spring 3-3, the rack plate 3-1 moves to the left to reset, and the upper jaw 7 and lower jaw 8 automatically open, completing the reset.

[0026] This structure is reasonably designed and has a compact overall size, allowing it to be used normally in confined environments such as narrow spaces, inside equipment, and in small installation positions. It breaks through the limitations of traditional long-handled pliers in terms of poor space adaptability. It is easy to use and suitable for operators of different ages and strengths, making it applicable to a wider range of scenarios.

[0027] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0028] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A quick-grip pliers with locking function, characterized in that: The clamp body (1) includes a tensioning and locking mechanism (2) which is adapted to and connected to the upper edge of the clamp body (1) and moves along the length of the upper edge. The rack and pinion transmission mechanism (3) and the pulley block mechanism (4) are located on both sides below the tensioning and locking mechanism (2). The linear motion end of the rack and pinion transmission mechanism (3) and the moving end of the pulley block mechanism (4) are connected to each other and guided and installed on the clamp body (1). The rotating end of the rack and pinion transmission mechanism (3) is connected to the upper jaw (7) and the lower jaw (8) which are distributed on the left end of the clamp body (1). When the linear motion end of the rack and pinion transmission mechanism (3) moves to the left or to the right, the upper jaw (7) and the lower jaw (8) are controlled to open or clamp. The clamp body (1) is internally guided and installed with a tensioning component (5) that slides left and right along its length and is located on the right side of the pulley block mechanism (4) and a reversing wheel (6) that is rotatably installed inside the clamp body (1) and is located on the left side of the tension locking mechanism (2). The wire rope (4-1) in the pulley block mechanism (4) is connected to the tension locking mechanism (2) via the tensioning component (5) and the reversing wheel (6), and the clamping control of the upper jaw (7) and the lower jaw (8) is achieved by pulling the tension locking mechanism (2) to the right. The lower right end of the clamp body (1) is rotatably equipped with a rear tensioning handle (9), and the upper end of the rear tensioning handle (9) is connected to the tensioning component (5) through a pull rope (10). The tensioning component (5) is pulled to the right by the rear tensioning handle (9) to achieve enhanced clamping of the upper jaw (7) and the lower jaw (8).

2. The small-grip quick-clamping pliers with locking function according to claim 1, characterized in that: The clamp body (1) has waist-shaped long holes (12) on the front and rear outer walls. The linear motion end of the rack and pinion transmission mechanism (3) is pinned to one end of the guide plate (11) that is slidably adapted to the waist-shaped long holes (12) on both sides of the clamp body (1). The moving end of the pulley block mechanism (4) is connected to the other end of the two guide plates (11).

3. The small-grip quick-clamping pliers with locking function according to claim 2, characterized in that: The rack and pinion transmission mechanism (3) includes a rack plate (3-1), two gears (3-2) distributed vertically and rotatably mounted on the left end of the clamp body (1), and a tension spring (3-3). The two gears (3-2) and the upper jaw (7) and lower jaw (8) on the right end, which rotate synchronously with the two gears (3-2), are rotatably mounted on the left end of the clamp body (1). The left end of the rack plate (3-1) is located between the two gears (3-2), and the teeth on the upper and lower plates on its left end are aligned with the gears. Two gears (3-2) mesh, the left end of the tension spring (3-3) is attached to the clamp body (1), and the other end of the tension spring (3-3) is attached to the left side wall of the U-shaped block with the slot facing down fixed on the right bottom surface of the rack plate (3-1). When the rightward tension of the rack plate (3-1) is eliminated, the rack plate (3-1) is controlled to move to the left and reset by the tension spring (3-3). The U-shaped block on the right bottom surface of the rack plate (3-1) is pinned to one end of the two guide plates (11) by a connecting pin.

4. The small-grip quick-clamping pliers with locking function according to claim 3, characterized in that: The pulley block mechanism (4) includes a wire rope (4-1), a movable pulley block (4-2), and a stationary pulley block (4-3). The two ends of the rotating shaft of the movable pulley block (4-2) are connected to the other end of the corresponding side guide plate (11). The stationary pulley block (4-3) is rotatably installed inside the clamp body (1). One end of the wire rope (4-1) is fixed to the inner wall of one side of the clamp body (1), and the other end of the wire rope (4-1) passes through the movable pulley block (4-2), the stationary pulley block (4-3), the tensioning component (5), and the reversing wheel (6) in sequence and is fixedly connected to the tensioning locking mechanism (2).

5. The small-grip quick-clamping pliers with locking function according to claim 1, characterized in that: The tensioning locking mechanism (2) includes a front tensioning handle (2-1), a cam handle (2-2), an arm (2-3), a tension spring (2-12), a pawl (2-4), and a slider (2-5). The lower end of the front tensioning handle (2-1) is adapted to and fixed to the upper end of the slider (2-5) by a protrusion in the middle of the upper end face. The right end of the arm (2-3) is located in the groove on the upper end face of the protrusion. The upper end faces of the front and rear side plates of the clamp body (1) are provided with clamp body racks (2-6), and the pawls (2-4) on the front and rear sides of the lower end of the front tensioning handle (2-1) mesh with the clamp body racks (2-6) on the same side. The right end of the arm (2-3) and Two pawls (2-4) are fixedly connected to pin 1 (2-7) on the upper protrusion of the front tension handle (2-1) and the slider (2-5). The left end of the arm (2-3) is located in the connecting groove in the middle of the cam at the lower end of the cam handle (2-2), and the hanging ring at the upper end of the tension spring (2-12) is located in the connecting groove in the middle of the left end of the arm (2-3). The cam at the lower end of the cam handle (2-2) and the hanging ring at the upper end of the arm (2-3) and the tension spring (2-12) are connected by pin 2 (2-8). By pulling the handle at the upper end of the cam handle (2-2) to the right, the pawl (2-4) is disengaged from the clamp rack (2-6). The clamp body (1) has guide grooves (2-9) on the inner walls of the front and rear side plates, and guide protrusions (2-10) on the two side walls of the slider (2-5) between the front and rear side plates of the clamp body (1) are adapted to the guide grooves (2-9) on the same side. The slider (2-5) is provided with a pin shaft three (2-11), and the lower end of the tension spring two (2-12) that passes through the U-shaped groove at the upper left end of the clamp body rack (2-6) is hung on the pin shaft three (2-11). When the tension of the upper handle of the cam handle (2-2) is eliminated by pushing it to the right, the cam handle (2-2) is pulled to the left and reset under the action of the tension spring two (2-12), so as to realize the engagement and locking of the pawl (2-4) and the clamp body rack (2-6). The other end of the wire rope (4-1) is fixed on the slider (2-5).

6. The small-grip quick-clamping pliers with locking function according to claim 4, characterized in that: The tensioning assembly (5) includes a tensioning wheel (5-1) and a connecting rod (5-2). The front and rear side walls of the right end of the clamp body (1) are provided with corresponding waist-shaped grooves (5-3). The upper part of the tensioning wheel (5-1) is located in the mounting hole on the upper right end face of the clamp body (1), and the milled flat parts at both ends of the shaft of the tensioning wheel (5-1) slide to fit into the waist-shaped groove (5-3) on the same side. The left end of the connecting rod (5-2) is rotatably connected to the shaft of the tensioning wheel (5-1), and the right end of the connecting rod (5-2) is connected to the left end of the pull rope (10).

7. The small-grip quick-clamping pliers with locking function according to claim 1, characterized in that: The rear tensioning handle (9) is a V-shaped structure formed by two outwardly opening arc rods. The lower right side of the clamp body (1) is provided with a handle groove (13) that is adapted to the left side rod of the rear tensioning handle (9). The rotating pin at the middle corner of the rear tensioning handle (9) is connected to the clamp body (1), and the upper end of the rear tensioning handle (9) located inside the clamp body (1) is connected to the right end of the pull rope (10).

8. The small-grip quick-clamping pliers with locking function according to claim 1, characterized in that: The upper claw (7) and lower claw (8) are arc-shaped, and the left end of the upper claw (7) and lower claw (8) has several interlocking teeth.

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