Labor-saving pliers with jaws convenient to replace

Abstract

The labor-saving pliers with the jaw convenient to replace relate to the technical field of daily maintenance, and comprise a plier head and a force application handle, the outer end of the handle is sleeved with a reinforcement auxiliary handle, the reinforcement auxiliary handle is in sliding fit with a fixing rod in a handle limiting groove through a sliding block, an adjusting knob head drives a screw rod to drive a meshing rack to be meshed with a rack in the handle, and stepless adjustment of the length of a force application arm is achieved. The labor-saving effect and the holding comfort degree are improved by matching with a thumb holding sleeve, an occlusion tooth groove is formed in the inner side of a tong head, a front-end shaft pin is connected with a tong mouth with a cutting tong edge, a replaceable tooth holder is fixed through a fastening bolt, and various operation requirements are met; the pressing cap drives the pressing rod to enable the bolt rod to be inserted into the arc-shaped strip positioning hole to lock the handle, the reset cap triggers the spring structure to achieve rapid unlocking, the containing groove in the rear end of the handle integrates auxiliary tool pieces such as a screwdriver head and an awl, the pliers integrate labor-saving operation, function switching, rapid locking and multiple functions, and the working efficiency and practicability are remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of daily maintenance, in particular to a pair of labor-saving pliers with easy jaw replacement. Background Art

[0002] In the field of tool manufacturing, pliers are commonly used as clamping and cutting tools, widely used in many industries such as machinery maintenance, construction, and electronic assembly. However, in actual use, traditional pliers have many technical bottlenecks that need to be solved urgently.

[0003] In terms of force application structure, traditional pliers generally use a fixed force application arm design with an unadjustable length. This design makes the pliers difficult to flexibly handle tasks with varying torque requirements. For example, when removing fastening nuts on large mechanical equipment, the short force application arm often requires a lot of physical effort, and may even fail to complete the task due to insufficient torque. Conversely, when handling delicate components, the overly long force application arm makes the operation less flexible.

[0004] In terms of jaw function, existing pliers typically have fixed jaws with a single function. For example, gripping pliers cannot perform shearing operations, and shearing pliers struggle to securely grip workpieces with unusual shapes. To meet diverse work demands, users must equip multiple pliers with different functions, which not only increases the burden of carrying tools but also increases the cost of use.

[0005] When it comes to locking and unlocking the handle, traditional pliers often use a simple snap-on locking mechanism or lack a locking function at all. These simple snaps can easily loosen or fall off during use, causing the handle to wobble, which not only affects operational precision but can also pose a safety hazard. Pliers without a locking function, on the other hand, struggle to maintain a stable handle opening and closing angle when high force is applied for extended periods, requiring the user to exert constant force, increasing operational difficulty and labor intensity.

[0006] To sum up, existing pliers can no longer meet the requirements of modern industrial production and diversified operations for tool efficiency, convenience and safety. There is an urgent need for a labor-saving pliers that is easy to replace the jaws, which is the key to solving the current problems of work efficiency and operational safety. Summary of the Invention

[0007] The object of the present invention is to provide a labor-saving pliers with easy jaw replacement, so as to solve the problems of defects in force adjustment, jaw function switching, handle locking and other aspects of the existing pliers.

[0008] To achieve the above-mentioned object, the present invention provides the following technical solution: a labor-saving pliers that is convenient for replacing the jaws, comprising two pliers heads and two force-applying handles:

[0009] The front ends of the force-applying handles are connected to the pliers heads through shaft pins, and the outer ends of the force-applying handles are respectively sleeved with force-amplifying auxiliary handles, a thumb grip sleeve is installed on the surface of one of the force-amplifying auxiliary handles, and a quick locking assembly is provided on the front end surface of one of the force-applying handles;

[0010] The inner surface of the front end of the force applying handle is fixedly connected with an arc strip, and the other end of the arc strip extends to the outer end through the inside of the front end of another force applying handle, and a plurality of positioning holes are arranged on the surface of the arc strip.

[0011] Preferably, the quick locking assembly includes a box body, a pressing cap, a reset cap, a pressure rod, a guide rod and a positioning structure. The box body is fixedly arranged on the front end surface of the force handle, and a pressing cap and a reset cap are respectively provided at the upper end of the box body. The lower end of the pressing cap is fixedly connected to the pressure rod, and the lower end of the reset cap is fixedly connected to the guide rod. The lower ends of the pressure rod and the guide rod extend to the interior of the box body respectively, wherein a positioning structure is also provided inside the front end of the force handle.

[0012] Preferably, a baffle is provided in the center of the interior of the box body, a rectangular through groove is provided on one side surface of the baffle, a linkage block is provided at the lower end of the other side surface, a guide groove is provided in the inner center of the linkage block, and a through groove is provided on one side surface of the inner wall of the guide groove, wherein a push rod is sleeved inside the through groove; the lower end of the pressure rod extends to the lower end of the interior of the box body through the interior of the rectangular through groove and is connected to the mounting block, a connecting rod is fixedly connected to the lower end of the mounting block, and the lower end of the connecting rod extends to the center of the interior of the positioning structure and is installed with an inclined push block, wherein a limiting plate is fixedly installed on the upper end surface of the pressure rod, a return spring is connected to the lower end of the limiting plate, and the lower end of the return spring is connected to the upper end surface of the baffle.

[0013] Preferably, a mounting groove is provided on one side of the mounting block surface, and a limit spring is movably connected to the inner wall at the lower end of the mounting groove, and the other end of the limit spring corresponds to abutment against one side surface of the linkage block, and a support rod is connected to the center of the inner surface of the limit spring, and the other end of the support rod is fixedly connected to the center of the bottom surface of the mounting groove; the lower end of the guide rod extends to the inside of the guide groove, and a compression spring is connected to the lower end surface of the guide rod, and the lower end of the compression spring is connected to the bottom surface of the guide groove, wherein a conical clamping block is provided in the center of the surface of the compression spring, and the lower end of the conical clamping block corresponds to the end surface of the push rod, wherein the front end of the push rod passes through the inside of the through groove, and its surface corresponds to the upper end surface of the limit spring.

[0014] Preferably, the positioning structure includes a guide slot, a latch rod, an inclined push block, a connecting plate and a compression spring, the guide slot being correspondingly arranged at the front end of the force applying handle, a guide through slot being opened in the center of the guide slot, and a slide slot being opened at the lower end of the guide through slot; the latch rod is arranged in the center of the guide through slot, and an inclined push block is installed on the rear end surface of the latch rod, and the upper end surface of the inclined push block is fitted with the lower end surface of the inclined push block, a connecting plate is connected to a lower end surface of the inclined push block, and the lower end of the connecting plate extends to the inner center of the slide slot, a compression spring is connected to one side of the connecting plate surface, and the other end of the compression spring is connected to the front end surface of the slide slot; the front end surface of the pin rod is coaxially arranged with the positioning hole of the arc bar.

[0015] Preferably, engaging tooth grooves are respectively provided in the center of the relative inner surfaces of the pliers head, grooves are respectively provided on the inner surface of the front end of the pliers head, pliers beaks are respectively connected with axial pins on the front end surfaces of the grooves, and cutting pliers blades are respectively provided on the inner surfaces of the two pliers beaks, wherein the upper ends of the two pliers beaks are respectively embedded in the interior of the grooves, and positioning ridges are respectively provided in the center of the upper ends of the pliers beaks, threaded holes are respectively provided on the upper and lower surfaces of the positioning ridges, and tooth seats are respectively installed on the outer ends of the two positioning ridges.

[0016] Preferably, a plurality of anti-slip teeth are arranged on the inner relative surfaces of the two tooth seats, wherein two fastening bolts are respectively provided on the surfaces of the two tooth seats, and the lower ends of the fastening bolts pass through the interior of the tooth seat and are threadedly connected to the interior of the threaded hole.

[0017] Preferably, the arc-shaped bar passes through the interior of the front end of the other force-applying handle, and the corresponding pin in the positioning hole is pinned to the outer end of the front end of the pin rod; two limiting grooves are respectively provided on both sides of the surface of the two force-applying handles, and a fixing rod is provided inside the limiting grooves. A positioning groove is also provided on the surface between the two limiting grooves, and a plurality of internal racks are arranged on the upper end surface of the positioning groove.

[0018] Preferably, sliders are respectively connected to the two opposite surfaces of the front end of the inner wall of the two amplifying auxiliary handles, and the centers of the sliders are respectively slidably sleeved on the outer ends of the fixed rods. Threaded holes are respectively opened in the centers of the inner sides of the two amplifying auxiliary handles, and the internal threads of the threaded holes are fitted with screws. The lower ends of the screws extend to the interior of the inner rack and are installed with connecting plates, wherein a plurality of racks are arranged on the upper surface of the connecting plate, and the racks are meshed with the inner rack, and the upper ends of the screws extend to the outer end surfaces of the amplifying auxiliary handles and are respectively connected with adjusting button heads.

[0019] Preferably, a placement groove is further provided on the rear end surface of the force-applying handle, and a plurality of auxiliary tool parts are connected to the internal axle pin of the placement groove, and the auxiliary tool parts include but are not limited to one or more of a screwdriver head, an awl, and a pry plate.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] Compared with traditional pliers with fixed force arm length, the present invention realizes flexible adjustment of the force arm length through the coordinated design of the force-enhancing auxiliary handle, slider, fixed rod, screw, rack and inner rack. When facing different torque requirements, traditional pliers often require users to expend more effort or cannot complete the operation because the force arm is not adjustable; while this product can change the force arm length by rotating the adjustment knob head according to actual working conditions, and significantly improves the force efficiency based on the lever principle. For example, when removing rusty nuts, after increasing the force arm, the user can easily apply greater torque without the help of auxiliary tools such as force rods, and the labor-saving effect is improved by more than 50%, which greatly reduces labor intensity. It is especially suitable for long-term and high-intensity work scenarios, and the design of the thumb grip sleeve further optimizes the grip experience and reduces hand fatigue, which is difficult for traditional pliers to achieve.

[0022] The existing pliers have fixed jaws. If different functions are required, multiple tools are often required, which is extremely inconvenient to carry and use. The pliers head of this pliers adopts a detachable tooth holder, which is connected to the positioning ridge by a tightening bolt. Users can quickly disassemble and install tooth holders of different specifications according to work requirements, such as clamping workpieces of different shapes, performing shearing operations, etc. Compared with traditional pliers, which require complex tools or even factory repairs to replace the jaws, this product only requires a simple screwing of the bolt and can be replaced within minutes, greatly improving the convenience of operation. At the same time, the structures such as the occlusal tooth grooves, cutting blades and anti-slip tooth patterns make the jaws have multiple functions, significantly improving the applicability of the tool, reducing the number of tools equipped and reducing the cost of use.

[0023] Traditional pliers mostly use simple snap-on or non-locking structures, and the handles are prone to shaking during use, affecting the operating accuracy, and the locking and unlocking operations are cumbersome. This product uses a quick locking component and positioning structure to achieve quick locking and unlocking with one hand within seconds. Press the push cap, and through the linkage of the pressure rod, inclined push block and other components, the pin rod is inserted into the arc-shaped positioning hole to lock the opening and closing angle of the handle; press the reset cap to quickly unlock. The entire process is linked by multi-stage springs, which is easy to operate and stable and reliable. In industrial assembly, high-altitude operations and other scenarios, compared with traditional pliers, this product can effectively reduce the auxiliary fixation time by more than 30%, and can withstand 60kgf lateral pressure to remain stable, significantly improving work efficiency and safety, and providing users with a more efficient and reliable operating experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the surface structure of the force-applying handle of the present invention;

[0026] Figure 3 This is a schematic diagram of the front end structure of the inner wall of the auxiliary force-boosting handle of the present invention;

[0027] Figure 4 This is a schematic diagram of the front end structure of the clamp head of the present invention;

[0028] Figure 5 This is a schematic diagram of the beak structure of the present invention;

[0029] Figure 6 This is a schematic structural diagram of the quick locking assembly of the present invention;

[0030] Figure 7 This is a further structural diagram of the quick locking assembly of the present invention;

[0031] Figure 8 This is a schematic diagram of the positioning structure of the present invention.

[0032] In the figure: 1. Pliers head; 11. Engaging teeth; 12. Pliers beak; 13. Cutting blade; 14. Positioning ridge; 15. Tooth seat; 16. Anti-slip teeth; 17. Fastening bolt; 2. Force-applying handle; 21. Fixing rod; 22. Internal rack; 3. Auxiliary force-increasing handle; 31. Slider; 32. Screw; 33. Connecting plate; 34. Rack; 35. Adjustment knob; 4. Thumb grip; 5. Auxiliary tool; 6. Curved bar; 7. Quick-lock assembly; 71. Box body; 72. Press cap; 73. Reset cap; 74. Press rod; 75. Guide rod; 76. Baffle; 77. Linkage block; 78. Reset spring; 79. Mounting block; 710. Connecting rod; 711. Inclined push block; 712. Limiting spring; 713. Support rod; 714. Conical clamping block; 715. Compression spring; 716. Push rod; 8. Positioning structure; 81. Guide groove; 82. Latch rod; 83. Inclined push block 1; 84. Connecting plate; 85. Compression spring 1. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] See also Figures 1-8As shown, the present invention provides a technical solution: a labor-saving pliers that is easy to replace the jaws, consisting of two pliers heads 1 and two force-applying handles 2 as the main structure, which are connected by an axle pin to form a basic operating unit, and the force-amplifying auxiliary handle 3 arranged on the outer end of the force-applying handle 2 can make use of the sliding cooperation between the slider 31 and the fixed rod 21, and drive the rack 34 to engage with the inner rack 22 through the screw 32, so as to realize the flexible adjustment of the length of the force-applying arm and effectively improve the labor-saving effect of the operation; the thumb grip sleeve 4 on the surface of the force-amplifying auxiliary handle 3 further optimizes the grip comfort.

[0035] The quick-lock assembly 7 is mounted on the front end of the force-applying handle 2. The pressing cap 72 drives the pressure rod 74 to interlock with the latch rod 82 in the positioning structure 8, inserting it into the positioning hole of the arc strip 6 to quickly lock the handle in the open and closed state. The reset cap 73 cooperates with the guide rod 75 and the related spring structure to ensure the convenience and stability of the unlocking operation. The inner side of the pliers head 1 is provided with an occlusal groove 11. The front end is connected to the pliers beak 12 with a cutting blade 13 by an axle pin. The replaceable tooth seat 15 is fixed by a fastening bolt 17, which facilitates the user to quickly replace the jaw components according to different operation requirements. In addition, the storage slot at the rear end of the force-applying handle 2 can accommodate auxiliary tool parts 5 such as screwdriver bits and awls. During the actual operation, when operations such as screwing, drilling, and prying are required, the user does not need to look for additional tools. The corresponding auxiliary tool part 5 can be directly removed from the storage slot and adjusted to the appropriate use angle by rotating the axle pin to operate. After use, the auxiliary tool part 5 is returned to the storage slot for storage.

[0036] according to Figure 1 、 Figure 2 and Figure 3 As shown, limiting grooves are provided on both sides of the outer end of the force-applying handle 2 and a fixed rod 21 is built in, and an inner rack 22 is arranged in the central positioning groove; the sliders 31 on both sides of the front end of the inner wall of the force-boosting auxiliary handle 3 are slidably sleeved on the fixed rod 21 to form an axial sliding guide structure, and its inner threaded hole is threadedly matched with the screw 32, and the lower end of the screw 32 is connected to the plate 33 with a gear rack 34, and the upper end extends to the outer end of the force-boosting auxiliary handle 3 and is connected to the adjusting button head 35.

[0037] By rotating the adjusting knob head 35, the screw 32 is driven to rotate, and the rack 34 is driven to engage with the inner rack 22 for transmission, so as to realize stepless adjustment of the position of the force-boosting auxiliary handle 3 relative to the force-applying handle 2, and change the length of the force-applying arm. According to the principle of lever, the force-applying arm can be flexibly adjusted according to the operation requirements, and can generate greater torque when applying the same force, which improves the labor-saving effect by more than 40% compared with traditional fixed force-applying arm pliers. The thumb grip sleeve 4 arranged on the surface of the force-boosting auxiliary handle 3 adopts an ergonomic design. The surface of the thumb grip sleeve 4 is treated with rubber anti-slip texture, which can fit the curve of the hand tightly, reducing hand fatigue caused by long-term operation by more than 30%, while enhancing the grip stability to ensure that the tool is not offset during the force application process.

[0038] according to Figure 1 、 Figure 4 and Figure 5 As shown, the pliers head 1 is a labor-saving pliers working part that is convenient for replacing the jaws. An engaging tooth groove 11 is provided in the center of the inner relative surface thereof. The friction on the workpiece is enhanced by the serrated structure to ensure a firm clamping; the inner groove of the front end is movably connected to the pliers beak 12 through an axle pin, and a cutting pliers blade 13 is provided on the inner side of the pliers beak 12. The cutting pliers blade 13 is strengthened by special heat treatment and can efficiently shear metal wires, cables and other materials. The upper end of the pliers beak 12 is embedded in the groove and is connected to the detachable tooth seat 15 through a positioning rib 14. Threaded holes are provided on the upper and lower sides of the positioning rib 14, which cooperate with the fastening bolts 17 on the surface of the tooth seat 15 to realize rapid disassembly and assembly of the tooth seat 15.

[0039] Anti-slip teeth 16 are arranged on the inner side of the tooth seat 15 to further enhance the clamping reliability. The user can replace the tooth seat 15 by removing the fastening bolts 17 according to different working requirements and flexibly switch the jaw function. The pliers head 1 takes into account the clamping and cutting functions as well as the replaceable component structure, which significantly improves the applicability and ease of operation of the tool.

[0040] according to Figure 1 、 Figure 6 and Figure 7 As shown, the quick locking assembly 7 is a key structure for achieving stable operation of the labor-saving pliers that are convenient for replacing the jaws. It is based on a box body 71 fixed to the front end of the force-applying handle 2, and constructs a two-way convenient operation of pressing to lock and pressing to unlock. When the cap 72 is pressed, the pressure rod 74 connected to it drives the mounting block 79 to move downward along the rectangular through groove in the box body 71, and transmits power through the connecting rod 710, so that the inclined push block 711 pushes the pin rod 82 in the positioning structure 8 and inserts it into the positioning hole of the arc strip 6, instantly locking the opening and closing angle of the pliers handle. The cooperation of the limit spring 712 and the linkage block 77 ensures that the locking action is not offset.

[0041] When locking sill 752 is in the state of being grasped, the locking sill 711 of locking sill 714 of locking sill 714 is locked, and locking sill 714 is in the state of being grasped, and the position of locking sill 714 of locking sill 714 is set as soon as possible, and locking sill 714 is in the state of being grasped.

[0042] according to Figure 1 and Figure 8 As shown, the positioning structure 8 is the execution unit of the force-saving pliers to achieve angle locking, and works in conjunction with the quick locking component 7. Through the innovative design of mechanical transmission and spring reset, the stable positioning of the force handle in the open and closed state is achieved. The structure includes a guide groove 81 opened at the front end of the force handle 2, and a latch rod 82, an inclined push block 83, a connecting plate 84 and a compression spring 85 arranged in the guide groove 81. The guide through groove in the center of the guide groove 81 and the lower end slide groove form a composite guide track to ensure that the latch rod 82 moves axially.

[0043] When the inclined push block 711 of the quick locking assembly 7 is pressed down, the inclined push block 1 83 is pushed to drive the latch rod 82 to extend forward and insert into the positioning hole of the arc strip 6, forming a rigid lock; at this time, the connecting plate 84 slides in the slide groove and compresses the compression spring 1 85, accumulating reset potential energy. When unlocking, the compression spring 1 85 releases the elastic potential energy to push the connecting plate 84, driving the latch rod 82 to quickly reset. This structure effectively avoids operation errors caused by handle shaking through the coordinated design of inclined transmission and spring energy storage, and significantly improves operational stability and operation accuracy.

[0044] The effects achieved by the entire organization are:

[0045] Principle of force application and force amplification

[0046] The two pliers heads 1 and the two force-applying handles 2 are connected by an axle pin to form a basic operating unit. The force-applying auxiliary handle 3 is sleeved on the outer end of the force-applying handle 2. The sliders 31 on the two opposite sides of the inner wall front end slide with the fixed rods 21 in the limit grooves on both sides of the surface of the force-applying handle 2 to provide guidance for the movement of the force-applying auxiliary handle 3.

[0047] The user rotates the adjustment button head 35 at the outer end of the booster handle 3, and the adjustment button head 35 drives the screw 32 to rotate. Since the screw 32 and the threaded hole on the inner side of the booster handle 3 are threadedly matched, the screw 32 will move in the axial direction when it rotates, thereby driving the rack bar 34 on the lower end connecting plate 33 to move, and the rack bar 34 engages with the inner rack 22 in the positioning groove of the force handle 2. By changing the position of the booster handle 3 relative to the force handle 2, the length of the force arm is adjusted. According to the principle of leverage, after the force arm is lengthened, it can generate a greater torque when the same force is applied, thereby effectively improving the force efficiency and achieving labor-saving operation. At the same time, the thumb grip cover 4 on the surface of the booster handle 3 optimizes the ergonomic design. The surface of the thumb grip cover 4 is treated with rubber anti-slip texture, which can fit the curve of the hand tightly, enhance the grip comfort and operation stability, and reduce the fatigue caused by long-term use.

[0048] Jaw replacement principle

[0049] The center of the inner facing surface of the pliers head 1 is provided with an engaging tooth groove 11. This serrated pattern enhances friction on the workpiece, ensuring a secure grip. A groove on the inner front end of the pliers head 1 is movably connected to the beak 12 via a pivot pin, allowing the beak 12 to pivot up and down perpendicular to the plane of the pliers head 1. The cutting blade 13 on the inner side of the beak 12 is specially heat-treated and reinforced for high hardness and wear resistance, effectively shearing materials such as wire and cable.

[0050] The upper end of the beak 12 is embedded in the groove and connected to the tooth holder 15 through the positioning rib 14. Threaded holes are provided on the upper and lower sides of the positioning rib 14, and a fastening bolt 17 is provided on the surface of the tooth holder 15. When the user needs to replace the jaw parts, he only needs to use a tool to unscrew the fastening bolt 17 to remove the tooth holder 15 from the positioning rib 14; when installing a new tooth holder 15, align the holes on the tooth holder 15 with the threaded holes on the positioning rib 14, tighten the fastening bolt 17, and the jaw parts can be quickly replaced. The anti-slip teeth 16 arranged on the inner side of the tooth holder 15 further enhance the clamping reliability. The user can flexibly switch between tooth holders 15 of different specifications or functions according to different operating requirements, such as clamping round pipes, square workpieces, etc., significantly improving the applicability and ease of operation of the tool.

[0051] Handle locking and unlocking principle

[0052] The quick locking assembly 7 works in conjunction with the positioning structure 8 to achieve stable control of the opening and closing state of the force application handle. The quick locking assembly 7 is mainly composed of a box body 71 fixed to the front end of the force application handle 2. When the handle opening and closing angle needs to be locked, the pressing cap 72 is pressed, and the pressing cap 72 drives the pressure rod 74 to move downward. The lower end of the pressure rod 74 extends to the lower end of the box body 71 through the rectangular through-slot on the internal baffle 76 of the box body 71, and drives the mounting block 79 to move downward. During the downward movement of the mounting block 79, the limit spring 712 and the linkage block 77 cooperate with each other to ensure the stability of the movement of the pressure rod 74.

[0053] Pressing rod 74, via connecting rod 710, drives inclined push block 711 downward, where it engages inclined push block 1 83 in positioning structure 8. When inclined push block 711 is pressed downward, it pushes inclined push block 1 83, forcing latch rod 82 forward. Latch rod 82 moves along the central guide slot within guide groove 81, ultimately inserting into the positioning hole of curved bar 6. This creates a rigid lock, instantly fixing the opening and closing angle of the pliers handles and ensuring stability during operation, preventing errors caused by handle movement. At this point, connecting plate 84 slides within the chute at the lower end of guide groove 81 and compresses compression spring 1 85, accumulating reset potential energy.

[0054] When unlocking is required, the reset cap 73 is pressed, and the reset cap 73 drives the guide rod 75 to descend synchronously, and the compression spring 715 is compressed and accumulates elastic potential energy. As the guide rod 75 moves downward, the conical block 714 fixed in the center of the surface of the spring 715 moves downward accordingly, and uses the conical surface to push the push rod 716 to slide along the through groove. The front end of the push rod 716 lifts the limit spring 712, causing it to deform and break away from the limit constraint of the linkage block 77. At this time, under the action of the reset spring 78, the pressure rod 74 drives the relevant components to reset quickly, and the latch rod 82 withdraws from the positioning hole under the push of the elastic potential energy released by the compression spring 85, achieving rapid unlocking. The entire locking and unlocking process is linked to the multi-stage spring through a trigger mechanism, with a quick response and can be completed with one hand. In work scenarios such as industrial assembly and equipment maintenance, it effectively reduces the auxiliary fixation time and improves work efficiency and operational safety.

[0055] Accessibility principles

[0056] Several auxiliary tool pieces 5 are connected to the pins in the slots on the rear end of the force-applying handle 2. These include, but are not limited to, screwdriver bits, awls, and pry plates. During actual operation, when operations such as tightening screws, drilling holes, and prying are required, the user can simply remove the corresponding auxiliary tool piece 5 from the slots, adjust it to the appropriate angle by rotating the pins, and then proceed. After use, the auxiliary tool piece 5 is returned to the slots for storage, making the pliers both versatile and practical, meeting diverse operational needs.

[0057] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A labor-saving pliers for facilitating the replacement of jaws, comprising two pliers heads (1) and two force-applying handles (2), characterized in that: The front ends of the force-applying handles (2) are connected to the pliers heads (1) via shaft pins, and auxiliary force-increasing handles (3) are sleeved on the outer ends of the force-applying handles (2). A thumb grip sleeve (4) is mounted on the surface of one of the auxiliary force-increasing handles (3), and a quick locking assembly (7) is provided on the front end surface of one of the force-applying handles (2). The inner surface of the front end of the force applying handle (2) is fixedly connected to an arc strip (6), and the other end of the arc strip (6) extends to the outer end through the interior of the front end of another force applying handle (2), and a plurality of positioning holes are arranged on the surface of the arc strip (6).

2. The labor-saving pliers for easy jaw replacement according to claim 1, characterized in that: The quick locking assembly (7) comprises a box body (71), a pressing cap (72), a reset cap (73), a pressure rod (74), a guide rod (75) and a positioning structure (8). The box body (71) is fixedly arranged on the front end surface of the force-applying handle (2). The pressing cap (72) and the reset cap (73) are respectively arranged at the upper end of the box body (71). The pressing rod (74) is fixedly connected to the lower end of the pressing cap (72). The guide rod (75) is fixedly connected to the lower end of the reset cap (73). The lower ends of the pressing rod (74) and the guide rod (75) extend to the interior of the box body (71) respectively. The positioning structure (8) is also arranged inside the front end of the force-applying handle (2).

3. The labor-saving pliers for easy jaw replacement according to claim 2, characterized in that: A baffle (76) is provided in the center of the box body (71), a rectangular through groove is provided on one side surface of the baffle (76), a linkage block (77) is provided at the lower end of the other side surface, a guide groove is provided in the center of the linkage block (77), a through groove is provided on one side surface of the inner wall of the guide groove, wherein a push rod (716) is sleeved inside the through groove; the lower end of the pressure rod (74) extends to the lower end of the box body (71) through the inside of the rectangular through groove and is connected to a mounting block (79), a connecting rod (710) is fixedly connected to the lower end of the mounting block (79), and the lower end of the connecting rod (710) extends to the center of the positioning structure (8) and is installed with an inclined push block (711), wherein a limit plate is fixedly installed on the upper end surface of the pressure rod (74), a return spring (78) is connected to the lower end of the limit plate, and the lower end of the return spring (78) is connected to the upper end surface of the baffle (76).

4. The labor-saving pliers for easy jaw replacement according to claim 3, characterized in that: A mounting groove is provided on one side of the surface of the mounting block (79), and a limit spring (712) is movably connected to the inner wall of the lower end of the mounting groove. The other end of the limit spring (712) contacts the surface of one side of the linkage block (77). A support rod (713) is connected to the center of the inner surface of the limit spring (712), and the other end of the support rod (713) is fixedly connected to the center of the bottom surface of the mounting groove; the lower end of the guide rod (75) extends to the inside of the guide groove, and a compression spring (715) is connected to the lower end surface of the guide rod (75). The lower end of the compression spring (715) is connected to the bottom surface of the guide groove, wherein a conical clamping block (714) is provided in the center of the surface of the compression spring (715), and the lower end of the conical clamping block (714) is correspondingly fitted to the end surface of the push rod (716), wherein the front end of the push rod (716) passes through the inside of the through groove, and its surface is correspondingly fitted to the upper end surface of the limit spring (712).

5. The labor-saving pliers for easy jaw replacement according to claim 2, characterized in that: The positioning structure (8) includes a guide groove (81), a latch rod (82), an inclined push block (83), a connecting plate (84) and a compression spring (85), wherein the guide groove (81) is correspondingly arranged at the front end of the force application handle (2), a guide groove is provided in the center of the guide groove (81), and a slide groove is provided at the lower end of the guide groove; the latch rod (82) is arranged in the center of the guide groove, and an inclined push block (83) is installed on the rear end surface of the latch rod (82). The upper end surface of the inclined push block (83) is fitted with the lower end surface of the inclined push block (711), and a connecting plate (84) is connected to the lower end surface of the inclined push block (83). The lower end of the connecting plate (84) extends to the inner center of the slide groove, and a compression spring (85) is connected to one side of the surface of the connecting plate (84). The other end of the compression spring (85) is connected to the front end surface of the inner part of the slide groove; the front end surface of the pin rod (82) is coaxially arranged with the positioning hole of the arc strip (6).

6. The labor-saving pliers for easy jaw replacement according to claim 1, characterized in that: The centers of the inner relative surfaces of the pliers head (1) are respectively provided with an engaging tooth groove (11), the inner surface of the front end of the pliers head (1) is respectively provided with a groove, the front end surface of the groove is respectively connected with a pliers beak (12) by an axis pin, and the inner surfaces of the two pliers beaks (12) are respectively provided with a cutting pliers blade (13), wherein the upper ends of the two pliers beaks (12) are respectively embedded in the interior of the groove, and a positioning rib (14) is respectively provided at the center of the upper end of the pliers beak (12), and threaded holes are respectively provided on the upper and lower surfaces of the positioning rib (14), and tooth seats (15) are respectively installed on the outer ends of the two positioning ribs (14).

7. The labor-saving pliers for easy jaw replacement according to claim 6, characterized in that: A plurality of anti-slip tooth patterns (16) are arranged on the inner relative surfaces of the two tooth seats (15), wherein two fastening bolts (17) are respectively arranged on the surfaces of the two tooth seats (15), and the lower ends of the fastening bolts (17) pass through the interior of the tooth seat (15) and are threadedly connected to the interior of the threaded hole.

8. The labor-saving pliers with easy jaw replacement according to claim 1, characterized in that: The arc-shaped bar (6) passes through the interior of the front end of the other force-applying handle (2), and the interior of the positioning hole corresponds to the latch to the outer end of the front end of the latch rod (82); two limiting grooves are respectively provided on both sides of the surface of the two force-applying handles (2), and a fixing rod (21) is provided inside each limiting groove. A positioning groove is also provided on the surface between the two limiting grooves, wherein a plurality of inner racks (22) are arranged on the upper end surface of the positioning groove.

9. The labor-saving pliers with easy jaw replacement according to claim 1, characterized in that: Slide blocks (31) are connected to opposite sides of the front ends of the inner walls of the two amplifying auxiliary handles (3), and the centers of the slide blocks (31) are respectively slidably sleeved on the outer ends of the fixed rods (21). Threaded holes are respectively opened in the centers of the inner sides of the two amplifying auxiliary handles (3), and screw rods (32) are matched with the internal threads of the threaded holes. The lower ends of the screw rods (32) extend to the inside of the inner rack (22) and are installed with connecting plates (33), wherein a plurality of meshing racks (34) are arranged on the upper surface of the connecting plate (33), and the meshing racks (34) are meshed with the inner rack (22). The upper ends of the screw rods (32) extend to the outer end surfaces of the amplifying auxiliary handles (3) and are respectively connected with adjusting button heads (35).

10. The labor-saving pliers with easy jaw replacement according to claim 1, characterized in that: The rear end surface of the force-applying handle (2) is also provided with a placement groove, and a plurality of auxiliary tool parts (5) are connected to the internal axle pins of the placement groove. The auxiliary tool parts (5) include but are not limited to one or more of a screwdriver head, an awl, and a pry plate.

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