A hand tool

Abstract

A hand tool. The present invention discloses a labor-saving pliers, comprising a first handle, a second handle, a first working part, a second working part and a working part connecting mechanism. The first handle and the first working part are fixedly connected, the second handle and the second working part are pivotally connected, the second working part is connected to the first working part through the working part connecting mechanism, the second working part has a first position and a second position, when the second handle moves from away from the first handle to close to the first handle, the working part connecting mechanism moves the second working part from the first position to the second position. The first position is the position of the second working part when it is away from the first working part, when the second working part is in the second position, compared with the first position, the second working part rotates and translates relative to the first working part. Compared with the existing locking pliers, the labor-saving pliers provided by the present invention can provide a greater clamping force, thereby playing a role of further saving labor.

Description

Technical Field

[0001] The invention relates to a manual tool, in particular to a labor-saving pliers. Background Art

[0002] Ordinary pliers generally include a fixed pliers head, a movable pliers head and a handle. The force acting on the handle is converted into a larger force on the pliers head through the lever principle. However, once the force acting on the handle disappears, the jaws will naturally loosen and can no longer clamp the workpiece. Since the force-saving pliers use the lever principle twice, the force acting on the handle is converted through the lever principle twice, and finally a clamping force several times the applied force can be formed at the jaws, thus achieving the purpose of saving effort.

[0003] In the existing locking pliers, the movable jaws and the fixed jaws are pivotally connected via a single fixed axis. Since the pivot axis is far away from the jaws, if one wishes to further achieve the purpose of labor saving, one can set the pivot axis closer to the jaws. However, the consequence of this approach is that the opening angle of the jaws will be reduced. Summary of the invention

[0004] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a labor-saving pliers which is more labor-saving and has a larger jaw.

[0005] To achieve the above object, the present invention provides a hand tool, comprising:

[0006] A first handle and a first working portion fixedly connected to the first handle;

[0007] a second handle and a second working portion pivotally connected to the second handle; the second working portion having a first position and a second position; and

[0008] a working part connecting mechanism, wherein the second working part is connected to the first working part through the working part connecting mechanism, and the working part connecting mechanism is configured such that when the second handle moves from being away from the first handle to being close to the first handle, the working part connecting mechanism causes the second working part to move from the first position to the second position;

[0009] The first position is the position of the second working part when it is away from the first working part. When the second working part is in the second position, compared with the first position, the second working part rotates and translates relative to the first working part.

[0010] Furthermore, the working part connecting mechanism includes a hole arranged on the first working part, a groove arranged on the second working part, and an axis passing through the hole on the first working part and the groove on the second working part; the axis can move and rotate in the groove, so that the second working part can rotate and translate relative to the first working part.

[0011] Optionally, the working part connecting mechanism includes a hole arranged on the second working part, a groove arranged on the first working part, and an axis passing through the hole on the second working part and the groove on the first working part; the axis can move and rotate in the groove, so that the second working part can rotate and translate relative to the first working part.

[0012] Furthermore, the groove is a horizontal groove, an oblique groove or an arc groove.

[0013] Preferably, the working part connection mechanism comprises:

[0014] A first hole disposed on the first working part, a first groove disposed on the second working part, and a first shaft passing through the first hole and the first groove;

[0015] a second hole disposed on the second working portion, a second groove disposed on the first working portion, and a second shaft passing through the second hole and the second groove;

[0016] The first shaft can move and rotate in the first slot, and the second shaft can move and rotate in the second slot, so that the second working part can rotate and translate relative to the first working part.

[0017] Optionally, the working part connection mechanism includes:

[0018] a first hole disposed on the second working portion, a first groove disposed on the first working portion, and a first shaft passing through the first hole and the first groove;

[0019] A second hole disposed on the first working portion, a second groove disposed on the second working portion, and a second shaft passing through the second hole and the second groove;

[0020] The first shaft can move and rotate in the first slot, and the second shaft can move and rotate in the second slot, so that the second working part can rotate and translate relative to the first working part.

[0021] Further, a fitting clearance between the first shaft and the first hole and the first groove is smaller than a fitting clearance between the second shaft and the second hole and the second groove.

[0022] Optionally, the fitting clearance between the first shaft and the first hole and the first groove is equal to the fitting clearance between the second shaft and the second hole and the second groove.

[0023] Optionally, the fitting clearance between the first shaft and the first hole and the first groove is greater than the fitting clearance between the second shaft and the second hole and the second groove.

[0024] Furthermore, the first groove is an arc groove or a square groove.

[0025] Furthermore, the second groove is an arc groove or a square groove.

[0026] In a preferred embodiment of the present invention, a hand tool is provided, comprising:

[0027] A first handle and a first working portion fixedly connected to the first handle;

[0028] a second handle and a second working portion pivotally connected to the second handle; the second working portion having a first position and a second position;

[0029] a working part connecting mechanism, through which the second working part is connected to the first working part, and the working part connecting mechanism is configured such that when the second handle moves from being away from the first handle to being close to the first handle, the working part connecting mechanism causes the second working part to move from the first position to the second position; and

[0030] a rod-shaped member, the rod-shaped member being arranged between the second handle and the first handle;

[0031] The first position is the position of the second working part when it is away from the first working part. When the second working part is in the second position, compared with the first position, the second working part rotates and translates relative to the first working part.

[0032] Furthermore, the working part connecting mechanism includes a hole arranged on the first working part, a groove arranged on the second working part, and an axis passing through the hole on the first working part and the groove on the second working part; the axis can move and rotate in the groove, so that the second working part can rotate and translate relative to the first working part.

[0033] Optionally, the working part connecting mechanism includes a hole arranged on the second working part, a groove arranged on the first working part, and an axis passing through the hole on the second working part and the groove on the first working part; the axis can move and rotate in the groove, so that the second working part can rotate and translate relative to the first working part.

[0034] Furthermore, the groove is a horizontal groove, an oblique groove or an arc groove.

[0035] Preferably, the working part connection mechanism comprises:

[0036] A first hole disposed on the first working part, a first groove disposed on the second working part, and a first shaft passing through the first hole and the first groove;

[0037] a second hole disposed on the second working portion, a second groove disposed on the first working portion, and a second shaft passing through the second hole and the second groove;

[0038] The first shaft can move and rotate in the first slot, and the second shaft can move and rotate in the second slot, so that the second working part can rotate and translate relative to the first working part.

[0039] Optionally, the working part connection mechanism includes:

[0040] a first hole disposed on the second working portion, a first groove disposed on the first working portion, and a first shaft passing through the first hole and the first groove;

[0041] A second hole disposed on the first working portion, a second groove disposed on the second working portion, and a second shaft passing through the second hole and the second groove;

[0042] The first shaft can move and rotate in the first slot, and the second shaft can move and rotate in the second slot, so that the second working part can rotate and translate relative to the first working part.

[0043] Further, a fitting clearance between the first shaft and the first hole and the first groove is smaller than a fitting clearance between the second shaft and the second hole and the second groove.

[0044] Optionally, the fitting clearance between the first shaft and the first hole and the first groove is equal to the fitting clearance between the second shaft and the second hole and the second groove.

[0045] Optionally, the fitting clearance between the first shaft and the first hole and the first groove is greater than the fitting clearance between the second shaft and the second hole and the second groove.

[0046] Furthermore, the first groove is an arc groove or a square groove.

[0047] Furthermore, the second groove is an arc groove or a square groove.

[0048] Furthermore, the manual tool also includes an elastic member arranged between the second working part and the first handle.

[0049] Furthermore, a hanging hole is provided on the second working part, a hook is provided on the first handle, one end of the elastic member is restricted in the hanging hole, and the other end is connected to the hook.

[0050] Furthermore, the manual tool also includes an adjusting screw, and the adjusting screw is connected to the tail of the first handle through a thread.

[0051] Further, the rod-shaped member has a first end and a second end, the first end of the rod-shaped member is pivotally connected to the second handle, and the second end of the rod-shaped member is pivotally connected to the first handle and abuts against the adjusting screw.

[0052] Further, when the adjusting screw moves relative to the first handle, the adjusting screw causes the second end of the rod-shaped member to move relative to the first handle.

[0053] Furthermore, a groove is provided in the first handle, and an opening of the groove faces the second handle.

[0054] Further, a portion of the adjusting screw extends in the groove of the first handle, and another portion is disposed outside the first handle.

[0055] Furthermore, a groove is provided in the second handle, and an opening of the groove faces the first handle.

[0056] Furthermore, a third handle is pivotally connected to the groove of the second handle.

[0057] Furthermore, the length of the third handle is shorter than the length of the second handle.

[0058] Further, the third handle has an elongated end, and when the third handle pivots relative to the second handle, the elongated end can abut against the second handle to prevent the third handle from continuing to pivot relative to the second handle.

[0059] Furthermore, the rod-shaped member has a protrusion, and when the protrusion enters the groove of the second handle, the manual tool is locked; by rotating the third handle in the direction of the second handle, the slender end can push the protrusion out of the groove of the second handle, so that the manual tool is unlocked.

[0060] Further, a portion where the third handle is connected to the second handle is separated from a portion where the rod-shaped member is connected to the second handle, and is further away from the second working portion than a portion where the rod-shaped member is connected to the second handle.

[0061] Furthermore, a portion where the rod-shaped member is connected to the second handle and a portion where the second working portion is connected to the second handle are separated.

[0062] In another preferred embodiment of the present invention, there is provided a hand tool, comprising:

[0063] A first handle and a first working portion fixedly connected to the first handle;

[0064] a second handle and a second working portion pivotally connected to the second handle; the second working portion having a first position and a second position;

[0065] a working part connecting mechanism, wherein the second working part is connected to the first working part through the working part connecting mechanism, and the working part connecting mechanism is configured such that when the second handle moves from being away from the first handle to being close to the first handle, the working part connecting mechanism causes the second working part to move from the first position to the second position;

[0066] a rod-shaped member disposed between the second handle and the first handle; and

[0067] a limiting mechanism, the limiting mechanism being used to limit the displacement of the rod-shaped member relative to the second handle;

[0068] The first position is the position of the second working part when it is away from the first working part. When the second working part is in the second position, compared with the first position, the second working part rotates and translates relative to the first working part.

[0069] Furthermore, the working part connecting mechanism includes a hole arranged on the first working part, a groove arranged on the second working part, and an axis passing through the hole on the first working part and the groove on the second working part; the axis can move and rotate in the groove, so that the second working part can rotate and translate relative to the first working part.

[0070] Optionally, the working part connecting mechanism includes a hole arranged on the second working part, a groove arranged on the first working part, and an axis passing through the hole on the second working part and the groove on the first working part; the axis can move and rotate in the groove, so that the second working part can rotate and translate relative to the first working part.

[0071] Furthermore, the groove is a horizontal groove, an oblique groove or an arc groove.

[0072] Preferably, the working part connection mechanism comprises:

[0073] A first hole disposed on the first working part, a first groove disposed on the second working part, and a first shaft passing through the first hole and the first groove;

[0074] a second hole disposed on the second working portion, a second groove disposed on the first working portion, and a second shaft passing through the second hole and the second groove;

[0075] The first shaft can move and rotate in the first slot, and the second shaft can move and rotate in the second slot, so that the second working part can rotate and translate relative to the first working part.

[0076] Optionally, the working part connection mechanism includes:

[0077] a first hole disposed on the second working portion, a first groove disposed on the first working portion, and a first shaft passing through the first hole and the first groove;

[0078] A second hole disposed on the first working portion, a second groove disposed on the second working portion, and a second shaft passing through the second hole and the second groove;

[0079] The first shaft can move and rotate in the first slot, and the second shaft can move and rotate in the second slot, so that the second working part can rotate and translate relative to the first working part.

[0080] Further, a fitting clearance between the first shaft and the first hole and the first groove is smaller than a fitting clearance between the second shaft and the second hole and the second groove.

[0081] Optionally, the fitting clearance between the first shaft and the first hole and the first groove is equal to the fitting clearance between the second shaft and the second hole and the second groove.

[0082] Optionally, the fitting clearance between the first shaft and the first hole and the first groove is greater than the fitting clearance between the second shaft and the second hole and the second groove.

[0083] Furthermore, the first groove is an arc groove or a square groove.

[0084] Furthermore, the second groove is an arc groove or a square groove.

[0085] Further, the limiting mechanism includes a waist-shaped hole arranged on the second working part and a limiting shaft arranged in the waist-shaped hole, the rod-shaped member is pivotally connected to the second handle through the limiting shaft, and the limiting shaft cooperates with the waist-shaped hole to form the limiting mechanism.

[0086] Further, when the limiting shaft is in the waist-shaped hole facing the first handle, the first working part and the second working part are in a loose state; when the limiting shaft is in the waist-shaped hole away from the first handle, the first working part and the second working part are in a clamped state.

[0087] Furthermore, a groove is provided in the second handle, and an opening of the groove faces the first handle.

[0088] Furthermore, a third handle is provided in the groove of the second handle, the third handle is connected to the second handle, and the third handle is connected to the rod-shaped member through the limiting shaft.

[0089] Furthermore, a portion where the third handle is connected to the second handle is separated from a portion where the second handle is connected to the second working portion, and a portion where the third handle is connected to the second handle is separated from a portion where the third handle is connected to the rod-shaped member.

[0090] Furthermore, the length of the second handle is greater than the length of the third handle.

[0091] Furthermore, during the rotation of the second handle, the connection point between the rod-shaped member and the third handle will cross the line formed by the connection point between the third handle and the second handle and the connection point between the second handle and the second working part. When the second handle approaches the first handle and crosses the line, the first working part and the second working part are clamped; when the second handle moves away from the first handle and crosses the line, the first working part and the second working part are released.

[0092] Furthermore, the manual tool also includes an elastic member arranged between the second working part and the first handle.

[0093] Furthermore, a hanging hole is provided on the second working part, a hook is provided on the first handle, one end of the elastic member is restricted in the hanging hole, and the other end is connected to the hook.

[0094] Furthermore, the manual tool also includes an adjusting screw, and the adjusting screw is connected to the tail of the first handle through a thread.

[0095] Further, the rod-shaped member has a first end and a second end, the first end of the rod-shaped member is pivotally connected to the second handle, and the second end of the rod-shaped member is pivotally connected to the first handle and abuts against the adjusting screw.

[0096] Further, when the adjusting screw moves relative to the first handle, the adjusting screw causes the second end of the rod-shaped member to move relative to the first handle.

[0097] Furthermore, a groove is provided in the first handle, and an opening of the groove faces the second handle.

[0098] Further, a portion of the adjusting screw extends in the groove of the first handle, and another portion is disposed outside the first handle.

[0099] In another preferred embodiment of the present invention, there is provided a hand tool, comprising:

[0100] A first handle and a first working portion fixedly connected to the first handle;

[0101] a second handle and a second working portion pivotally connected to the second handle; the second working portion having a first position and a second position;

[0102] a working part connecting mechanism, wherein the second working part is connected to the first working part through the working part connecting mechanism, and the working part connecting mechanism is configured such that when the second handle moves from being away from the first handle to being close to the first handle, the working part connecting mechanism causes the second working part to move from the first position to the second position;

[0103] a sliding mechanism, the sliding mechanism being slidably mounted on the first handle;

[0104] a rod-shaped member, one end of which is pivotally connected to the second handle and the other end of which is pivotally mounted on the sliding mechanism;

[0105] The first position is the position of the second working part when it is away from the first working part. When the second working part is in the second position, compared with the first position, the second working part rotates and translates relative to the first working part.

[0106] Furthermore, the working part connecting mechanism includes a hole arranged on the first working part, a groove arranged on the second working part, and an axis passing through the hole on the first working part and the groove on the second working part; the axis can move and rotate in the groove, so that the second working part can rotate and translate relative to the first working part.

[0107] Optionally, the working part connecting mechanism includes a hole arranged on the second working part, a groove arranged on the first working part, and an axis passing through the hole on the second working part and the groove on the first working part; the axis can move and rotate in the groove, so that the second working part can rotate and translate relative to the first working part.

[0108] Furthermore, the groove is a horizontal groove, an oblique groove or an arc groove.

[0109] Preferably, the working part connection mechanism comprises:

[0110] A first hole disposed on the first working part, a first groove disposed on the second working part, and a first shaft passing through the first hole and the first groove;

[0111] a second hole disposed on the second working portion, a second groove disposed on the first working portion, and a second shaft passing through the second hole and the second groove;

[0112] The first shaft can move and rotate in the first slot, and the second shaft can move and rotate in the second slot, so that the second working part can rotate and translate relative to the first working part.

[0113] Optionally, the working part connection mechanism includes:

[0114] a first hole disposed on the second working portion, a first groove disposed on the first working portion, and a first shaft passing through the first hole and the first groove;

[0115] A second hole disposed on the first working portion, a second groove disposed on the second working portion, and a second shaft passing through the second hole and the second groove;

[0116] The first shaft can move and rotate in the first slot, and the second shaft can move and rotate in the second slot, so that the second working part can rotate and translate relative to the first working part.

[0117] Further, a fitting clearance between the first shaft and the first hole and the first groove is smaller than a fitting clearance between the second shaft and the second hole and the second groove.

[0118] Optionally, the fitting clearance between the first shaft and the first hole and the first groove is equal to the fitting clearance between the second shaft and the second hole and the second groove.

[0119] Optionally, the fitting clearance between the first shaft and the first hole and the first groove is greater than the fitting clearance between the second shaft and the second hole and the second groove.

[0120] Furthermore, the first groove is an arc groove or a square groove.

[0121] Furthermore, the second groove is an arc groove or a square groove.

[0122] Furthermore, one end of the rod-shaped member connected to the sliding mechanism is composed of a curved segment, and the curvature of the curved segment close to the first handle is greater than the curvature of the curved segment far from the first handle.

[0123] Furthermore, the manual tool also includes a locking mechanism, which is slidably mounted on the first handle and is located on the distal end side of the sliding mechanism close to the first handle.

[0124] Furthermore, the locking mechanism includes a guide rod and a locking plate, and the guide rod is mounted on the first handle and penetrates the locking plate.

[0125] Furthermore, the locking sheet is composed of multiple pieces, and the multiple locking pieces fit together.

[0126] Furthermore, the cross section of the guide rod is a rounded trapezoid, the middle of the locking plate has a hole for the guide rod to pass through, the hole is configured to have a rounded trapezoid with the same cross-sectional shape as the guide rod, and the guide rod and the locking plate are clearance-fitted.

[0127] Furthermore, the adjusting mechanism is installed on the guide rod and is located between the sliding mechanism and the locking mechanism, and the adjusting mechanism is configured to be displaceable in the length direction of the guide rod.

[0128] Further, the adjustment mechanism is configured so that when the adjustment mechanism reaches a maximum displacement toward either end of the guide rod, when the manual tool is locked, one end of the rod-shaped member connected to the sliding mechanism can contact the adjustment mechanism.

[0129] Furthermore, the adjustment mechanism comprises an adjustment screw and a carrier, wherein the carrier is mounted on the guide rod, and the adjustment screw is mounted on the carrier and can be displaced along the direction of the guide rod relative to the carrier.

[0130] Furthermore, the cross section of the carrier is the same as that of the locking plate, and a hole having the same shape and size as that of the locking plate is provided at the same position as that of the locking plate, and the guide rod passes through the hole on the carrier.

[0131] Furthermore, a groove is provided in the second handle, the opening of the groove faces the first handle, and a third handle is pivotally connected to the groove of the second handle.

[0132] Further, the third handle has an elongated end, and when the third handle pivots relative to the second handle, the elongated end can abut against the second handle to prevent the third handle from continuing to pivot relative to the second handle.

[0133] Furthermore, the rod-shaped member has a protrusion, and when the protrusion enters the second handle, the manual tool is locked; by rotating the third handle in the direction of the second handle, the slender end can push the protrusion out of the groove of the second handle, so that the manual tool is unlocked.

[0134] The hand tool provided by the present invention can be a labor-saving pliers, a water pump pliers, etc., wherein the first working part and the second working part are connected by a working part connecting mechanism. Regardless of whether the working part connecting mechanism adopts a single-axis or double-axis setting, the second working part is closer to the jaws than the existing pliers relative to the rotation axis of the first working part, and thus can save more effort than the existing pliers. In addition, since the shaft is arranged in the groove, that is, when the second working part moves relative to the first working part, the shaft moves and rotates in the groove, or the groove moves relative to the shaft, thereby ensuring that a larger jaw can be obtained. On the other hand, when clamping an object, since the shaft can move relative to the groove, the second working part not only rotates relative to the first working part, but also translates, thereby increasing the contact area (i.e., the gripping area) between the second working part and the first working part and the clamped object, making it more effective to grip the object.

[0135] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0136] Figure 1 is a schematic diagram of a hand tool of a preferred embodiment of the present invention, showing the shape of the horizontal groove when the first working part and the second working part are connected by a single shaft;

[0137] Figure 2 is a schematic diagram of a hand tool of a preferred embodiment of the present invention, showing the shape of the inclined groove when the first working part and the second working part are connected by a single shaft;

[0138] Figure 3 is a schematic diagram of a manual tool of a preferred embodiment of the present invention, showing the shape of the arc groove when the first working part and the second working part are connected by a single shaft;

[0139] Figure 4 is a schematic diagram of a manual tool of a preferred embodiment of the present invention, showing the shape of the arc groove when the first working part and the second working part are connected by a double shaft

[0140] Figure 5 is a schematic diagram of a force-saving pliers according to a specific embodiment of the present invention, wherein the jaws are in a closed state;

[0141] Figure 6 is a schematic diagram of a force-saving pliers according to a specific embodiment of the present invention, wherein the jaws are in an open state;

[0142] Figure 7 is a schematic diagram of a force-saving pliers according to a specific embodiment of the present invention, wherein the jaws are in a state of clamping an object;

[0143] Figure 8 It is a schematic diagram of a water pump pliers for preventing the handle from opening too much in a specific embodiment of the present invention;

[0144] Fig. 9 It is a schematic diagram of a self-adjusting water pump pliers in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0145] like Figure 1-4 As shown, a preferred embodiment of the present invention provides a hand tool, including a first handle 2, a first working part 1, a second handle 4, a second working part 3 and a working part connecting mechanism. The first handle 2 is fixedly connected to the second handle 4. In an alternative embodiment, the first handle 2 and the second handle 4 can be integrated. The second handle 4 is pivotally connected to the second working part 3, and the second working part 3 has a first position and a second position. The first position of the second working part 3 here refers to the position of the second working part 3 when it is away from the first working part 1. When the second working part 3 is in the second position, compared with the first position, the second working part 3 rotates and translates relative to the first working part 1. In an embodiment of the present invention, the first working part 1 and the second working part 3 cooperate to form a jaw for clamping an object or a shear cut for shearing an object. Whether a jaw or a shear cut is formed depends on the shape of the matching part of the first working part 1 and the second working part 3.

[0146] The second working part 3 is connected to the first working part 1 through a working part connecting mechanism 100, and the working part connecting mechanism 100 is configured such that when the second handle 4 moves from away from the first handle 2 to close to the first handle 2, the working part connecting mechanism 100 moves the second working part 3 from the first position to the second position.

[0147] Specifically, if Figure 1-3 As shown, the working part connecting mechanism 100 includes a hole provided on the first working part 1, a slot 6 provided on the second working part 3, and a shaft 5 penetrating the hole on the first working part 1 and the slot 6 on the second working part 3; the shaft 5 can move and rotate in the slot 6, so that the second working part 3 can rotate and translate relative to the first working part 1. However, it is not limited thereto, in an alternative embodiment, the hole is provided on the second working part 3, the slot 6 is provided on the first working part 1, and the shaft 5 penetrating the hole on the second working part 3 and the slot 6 on the first working part 1; the shaft 5 can move and rotate in the slot 6, so that the second working part 3 can rotate and translate relative to the first working part 1.

[0148] In order to prevent the first working part 1 and the second working part 3 from being misaligned when they cooperate, the groove 6 set on the first working part 1 or the second working part 3 can be designed as a horizontal groove, an oblique groove or an arc groove. In this way, when an external force is applied to the first handle 2 and the second handle 4 to rotate the second handle 4 relative to the first handle 2, the second working part 3 rotates around the axis 5. At the same time, since the groove 6 moves relative to the axis 5, it is equivalent to the axis 5 moving relative to the groove 6 along the shape of the groove 6 in the groove 6, so that the second working part 3 also moves relative to the first working part 1. The advantage of the second working part 3 moving relative to the first working part 1 is that when the hand tool is used to clamp an object, the angles of the first working part 1, the second working part 3 and the clamped object can be automatically adjusted according to the shape and thickness of the clamped object to achieve the best contact method. If the first working part 1 and the second working part 3, the clamped object can only be clamped in a scissor-like manner. In addition, the contact area between the first working part 1 and the second working part 3 and the clamped object can be increased, that is, the gripping area is increased, so that the gripping of the object is more reliable and effective. Here, the horizontal groove is defined as: when the jaws or shearing cut formed by the first working part 1 and the second working part 3 are closed, the groove on the vertical line of the line connecting the closing point of the first working part 1 and the second working part 3 to the clamping axis of the shaft 5 is a horizontal groove, that is, the slotting direction of the groove 6 is on the vertical line of the line connecting the closing point of the first working part 1 and the second working part 3 to the clamping axis of the shaft 5. If the groove 6 or the slotting direction of the groove 6 is not on the vertical line of the line connecting the closing point of the first working part 1 and the second working part 3 to the clamping axis of the shaft 5 (that is, the groove 6 is not perpendicular to the line), it is an oblique groove. The arc groove is a special case of the oblique groove, and the arc groove makes the movement trajectory of the shaft 5 in the groove 6 relative to the groove 6 an arc.

[0149] As another preferred embodiment, Figure 4As shown, the working part connection mechanism 100 includes: a first hole provided on the first working part 1, a first slot 8 provided on the second working part 3, and a first shaft 7 penetrating the first hole and the first slot 8; a second hole provided on the second working part 3, a second slot 10 provided on the first working part 1, and a second shaft 9 penetrating the second hole and the second slot 10. However, it is not limited thereto. In an alternative embodiment, the first hole is provided on the second working part 3, the first slot 8 is provided on the first working part 1, and the first shaft 9 penetrating the first hole on the second working part 3 and the first slot 8 on the first working part 1; the second hole is provided on the first working part 1, the second slot 10 is provided on the second working part 3, and the second shaft 9 penetrating the second hole on the first working part 1 and the second slot 10 on the second working part 3. The first shaft 7 can move and rotate in the first slot 8 (or the first slot 8 can move and rotate relative to the first shaft 7), and the second shaft 9 can move and rotate in the second slot 10, so that the second working part 3 can rotate and translate relative to the first working part 1. The first axis 7 is closer to the clamping or shearing area formed by the first working part 1 and the second working part 3 than the second axis 9. The first groove 7 may be a circular arc groove or a square groove, and the second groove 9 may be a circular arc groove or a square groove.

[0150] In a preferred embodiment of the present invention, the clearance between the first shaft 7 and the first hole and the first slot 8 is generally set to be smaller than the clearance between the second shaft 9 and the second hole and the second slot 10. In this way, when the first handle 2 and the second handle 4 are subjected to external force to cause the first working part 1 and the second working part 3 to clamp or shear an object, since the clearance between the first shaft 7 and the first hole and the first slot 8 is smaller, compared with the second shaft 9, the first shaft 7 is first subjected to the force of the first slot 8, until the first shaft 7 cannot continue to move relative to the first slot 8 under the force, or the first slot 8 cannot continue to move relative to the first shaft 7, the second shaft 9 begins to be subjected to the force of the second slot 10. Therefore, in this case, the first shaft 7 plays the role of the main force, and the second shaft 9 plays the role of assisting the first shaft 7 in bearing the external force.

[0151] In other embodiments of the present invention, the clearance between the first shaft 7 and the first hole and the first slot 8 is set to be equal to the clearance between the second shaft 9 and the second hole and the second slot 10. In this case, when the first handle 2 and the second handle 4 are subjected to external force to cause the first working part 1 and the second working part 3 to clamp or shear an object, since the clearance between the first shaft 7 and the first hole and the first slot 8 is equal to the clearance between the second shaft 9 and the second hole and the second slot 10, the first shaft 7 is subjected to the force of the first slot 8 while the second shaft 9 is also subjected to the force of the second slot 10, that is, the first shaft 7 and the second shaft 9 are similar to sharing the external force equally.

[0152] In other embodiments of the present invention, if the fitting clearance between the first shaft 7 and the first hole and the first groove 8 is set to be larger than the fitting clearance between the second shaft 9 and the second hole and the second groove 10, the second shaft 9 plays the main role in bearing the external force, and the first shaft 7 assists the second shaft 9 in bearing the external force.

[0153] The purpose of setting two axes (first axis 7 and second axis 9) in this embodiment is to allow the two axes to bear the external force together (whether one axis is mainly subjected to the force and the other axis is auxiliary to bear the force, or the two axes share the force equally). Compared with the case where only one axis is provided, the loss of the axis and the deformation of the hand tool caused by it can be reduced. On the other hand, the purpose of setting two axes is that the size of the jaws or shears formed by the rotation of the second working part 3 around the first axis 7 relative to the first working part 1 can be limited by the second axis 9, so as to prevent the jaws or shears from being too large and affecting the actual use, and to make the jaws or shears of appropriate size. At the same time, it also limits the distance between the first handle 2 and the second handle 4 from being too large, so that the user can easily achieve one-handed operation.

[0154] Figure 5-7 A specific embodiment of the present invention is shown, which provides a manual tool, more specifically, a labor-saving pliers, including a first handle 13, a second handle 14, a first working part 11, a second working part 12, a working part connecting mechanism 200, a rod-shaped member 21, an elastic member 22, a third handle (not shown) and an adjusting screw 25. Among them, the first handle 13 and the first working part 11 are fixedly connected, and the two can also be formed in one piece. The second handle 14 is pivotally connected to the second working part 12. In this embodiment, the working part connecting mechanism adopts the double-axis setting as described above, that is, it includes a first hole arranged on the first working part 11, a first groove 18 arranged on the second working part 12, and a first axis 17 that passes through the first hole and the first groove 18; a second hole arranged on the second working part 12, a second groove 20 arranged on the first working part, and a second axis 19 that passes through the second hole and the second groove 20. The first axis 17 is closer to the jaws formed by the first working part 11 and the second working part 12 than the second axis 19. The first shaft 17 can move and rotate in the first groove 18, and the second shaft 19 can move and rotate in the second groove 20, so that the second working part 12 can rotate and translate relative to the first working part 11. The first groove 18 and the second groove 20 are arc grooves, and can also be square grooves. As an alternative embodiment, the working part connecting mechanism 200 can also adopt the single-axis setting as described above (not shown here), that is, the working part connecting mechanism 200 includes a hole set on the first working part 11, a groove set on the second working part 12, and an axis passing through the hole on the first working part and the groove on the second working part 12. If it is a single-axis setting, the groove can be a horizontal groove, an oblique groove or an arc groove.

[0155] In this embodiment, the second working part 12 has a first position and a second position. The second working part 12 is connected to the first working part 11 through a working part connecting mechanism 200. When the second handle 14 moves from being away from the first handle 13 to being close to the first handle 13, the working part connecting mechanism 200 moves the second working part 12 from the first position to the second position. Here, the first position of the second working part 12 refers to the position of the second working part 12 when it is away from the first working part 11. When the second working part 12 is in the second position, compared with the first position, the second working part 12 has rotated and translated relative to the first working part 11.

[0156] In this embodiment, the clearance between the first shaft 17 and the first hole and the first slot 18 is smaller than the clearance between the second shaft 19 and the second hole and the second slot 20. In an alternative embodiment of this embodiment, the clearance between the first shaft 17 and the first hole and the first slot 18 can also be set to be equal to or greater than the clearance between the second shaft 19 and the second hole and the second slot 20. As mentioned above, one function of setting two shafts is to reduce shaft wear and deformation of the force-saving pliers by having the two shafts jointly bear the external force. Another function is to limit the size of the jaws by the second shaft 19, and also to limit the first handle 13 and the second handle 14 from being too far apart, so that the user can easily achieve one-handed operation.

[0157] In the labor-saving pliers of this embodiment, a groove extending along the length direction of the first handle 13 is provided in the first handle 13, and the opening of the groove faces the second handle 14. A groove extending along the length direction of the second handle 14 is provided in the second handle 14, and the opening of the groove faces the first handle 13. A first end of a rod-shaped member 21 is provided in the groove of the second handle 14, and the first end of the rod-shaped member 21 is pivotally connected to the second handle 14. A second end of the rod-shaped member 21 and an adjusting screw 25 are provided in the groove of the first handle 13, and the second end of the rod-shaped member 21 contacts the first end of the adjusting screw 25. The adjusting screw 25 extends in the groove of the first handle 13 along the length direction of the first handle 13 so that the second end of the adjusting screw 25 passes through an annular hole provided at the tail of the first handle 13 (i.e., the end away from the jaws), until the second end of the adjusting screw 25 is located outside the first handle 13. An internal thread matching the thread on the adjusting screw 25 is arranged in the annular hole, and the diameter of the annular hole is smaller than the diameter of the second end of the adjusting screw 25, so that the second end of the adjusting screw 25 cannot enter the first handle 13 through the annular hole.

[0158] Rotating the adjusting screw 25 can change the position of the first end of the adjusting screw 25 in the groove of the first handle 13, thereby adjusting the size of the jaws formed by the first working part 11 and the second working part 12 to adapt to the clamped objects 26 of different sizes. Specifically, when the adjusting screw 25 is rotated to move the second end of the adjusting screw 25 away from the jaws, the second end of the rod-shaped member 21 moves away from the jaws along with the movement of the first end of the adjusting screw 25, and the first end of the rod-shaped member 21 pulls the second handle 14 through the connection point 28 between the rod-shaped member 21 and the second handle 14, and then the second handle 14 pulls the second working part 12 through the connection point 27 between the rod-shaped member 21 and the second working part 12. Since the second working part 12 is restricted by the first axis 17 and the second axis 19 at the same time, the second working part 12 pivots around the first axis 17 and the second axis 19 away from the first working part 11, thereby widening the jaws. When the adjusting screw 25 is rotated to move the second end of the adjusting screw 25 in the direction close to the jaws, the second end of the rod-shaped member 21 moves close to the jaws as the first end of the adjusting screw 25 moves, and the first end of the rod-shaped member 21 pushes the second handle 14 through the connection point 28 between the rod-shaped member 21 and the second handle 14, and then the second handle 14 pushes the second working part 12 through the connection point 27 between the rod-shaped member 21 and the second working part 12. Since the second working part 12 is restricted by the first axis 17 and the second axis 19 at the same time, the second working part 12 pivots around the first axis 17 and the second axis 19 close to the first working part 11, thereby reducing the jaws.

[0159] In the labor-saving pliers of this embodiment, the elastic member 22 is arranged between the second working part 12 and the first handle 13. Specifically, a hanging hole 24 is arranged on the second working part 12, a hook portion 23 is arranged in the groove of the first handle 13, one end of the elastic member 22 is restricted in the hanging hole 24, and the other end is connected to the hook portion 23. The elastic member 22 of this embodiment is a spring, specifically a tension spring.

[0160] In the labor-saving pliers of this embodiment, a third handle is pivotally connected to the groove of the second handle 14. The length of the third handle is less than that of the second handle 14. The third handle has an elongated end, and when the third handle pivots relative to the second handle 14, the elongated end can abut against the second handle 14 to prevent the third handle from continuing to pivot relative to the second handle 14. In addition, the rod-shaped member 21 has a protrusion 211, and when the protrusion 211 enters the groove of the second handle 14, the manual tool is locked; when the third handle is rotated toward the direction of the second handle 14, the elongated end of the third handle can push the protrusion 211 of the rod-shaped member 21 out of the groove of the second handle 14, so that the labor-saving pliers are unlocked.

[0161] In the labor-saving pliers of this embodiment, the portion where the third handle is connected to the second handle 14 is separated from the portion 28 where the rod-shaped member 21 is connected to the second handle 14, and is further away from the second working portion 12 than the portion 28 where the rod-shaped member 21 is connected to the second handle 14. The portion 28 where the rod-shaped member 21 is connected to the second handle is separated from the portion 27 where the second working portion 12 is connected to the second handle 14.

[0162] In the labor-saving pliers of this embodiment, when the second working part 12 moves away from or approaches the first working part 11, the first groove 18 moves and rotates away from or approaches the first working part 11 relative to the first axis 17, and at the same time, the second axis 19 moves and rotates in the second groove 20 close to or away from the first working part 11, which is actually equivalent to the second working part 12 rotating away from or close to the first working part 11 around the virtual axis. The virtual axis here is imaginary due to the first axis 17 and the second axis 19. The virtual axis is located between the first axis 17 and the second axis 19, and because the first axis 17 is movable relative to the first groove 18 and the second axis 19 is movable relative to the second groove 20, the virtual axis is also movable. However, no matter how the virtual axis moves, compared with the second axis 19 (generally the position of the connecting axis of the movable clamp head and the fixed clamp head in the existing pliers), the virtual axis is closer to the jaws, so that the distance between the virtual axis and the jaws is smaller than that of the existing pliers. If the torque input at the contact point between the first working part 11 and the clamped object is constant, that is, the torque of the corresponding jaws is constant, since the distance between the virtual axis and the jaws is smaller than that of existing pliers, the clamping force generated by the jaws is greater, thereby achieving a labor-saving effect.

[0163] Figure 8Another specific embodiment of the present invention is shown, which provides a hand tool, specifically a water pump pliers that prevents the handle from opening too much, including a first handle 33, a second handle 34, a first working part 31, a second working part 32, a working part connecting mechanism 300, a rod-shaped member 41, a limiting mechanism, an elastic member 42 and an adjusting screw 45. Among them, the first handle 33 and the first working part 31 are fixedly connected, and the two can also be formed in one piece. The second handle 34 is pivotally connected to the second working part 32. In this embodiment, the working part connecting mechanism 300 adopts the double-axis setting as described above, that is, it includes a first hole set on the first working part 31, a first groove 38 set on the second working part 32, and a first axis 37 that passes through the first hole and the first groove 38; a second hole set on the second working part 32, a second groove 40 set on the first working part 31, and a second axis 39 that passes through the second hole and the second groove 40. The first axis 37 is closer to the jaws formed by the first working part 31 and the second working part 32 than the second axis 39. The first shaft 37 can move and rotate in the first groove 38, and the second shaft 39 can move and rotate in the second groove 40, so that the second working part 32 can rotate and translate relative to the first working part 31. The first groove 37 and the second groove 39 are arc grooves, and can also be square grooves. As an alternative embodiment, the working part connecting mechanism 300 can also adopt the single-axis setting as described above (not shown here), that is, the working part connecting mechanism 300 includes a hole set on the first working part 31, a groove set on the second working part 32, and an axis passing through the hole on the first working part 31 and the groove on the second working part 32. If it is a single-axis setting, the groove can be a horizontal groove, an oblique groove or an arc groove.

[0164] In this embodiment, the second working part 32 has a first position and a second position. The second working part 32 is connected to the first working part 31 through a working part connecting mechanism 300. When the second handle 34 moves from being away from the first handle 33 to being close to the first handle 33, the working part connecting mechanism 300 causes the second working part 32 to move from the first position to the second position. Here, the first position of the second working part 32 refers to the position of the second working part 32 when it is away from the first working part 31. When the second working part 32 is in the second position, compared with the first position, the second working part 32 has rotated and translated relative to the first working part 31.

[0165] In this embodiment, the clearance between the first shaft 37 and the first hole and the first slot 38 is smaller than the clearance between the second shaft 39 and the second hole and the second slot 40. In an alternative embodiment of this embodiment, the clearance between the first shaft 37 and the first hole and the first slot 38 can also be set to be equal to or greater than the clearance between the second shaft 39 and the second hole and the second slot 40. As mentioned above, one function of setting two shafts is to reduce the wear of the shafts and the deformation of the labor-saving pliers by jointly bearing the external force through the two shafts, and another function is to limit the size of the jaws through the second shaft 39, and also limit the first handle 33 and the second handle 34 from being too large, so that the user can easily achieve one-handed operation.

[0166] In the water pump pliers of this embodiment, a groove extending along the length direction of the first handle 33 is provided in the first handle 33, and the opening of the groove faces the second handle 34. A groove extending along the length direction of the second handle 34 is provided in the second handle 34, and the opening of the groove faces the first handle 33. The first end of the rod-shaped member 41 is provided in the groove of the second handle 34, and the first end of the rod-shaped member 41 is pivotally connected to the second handle 34. The second end of the rod-shaped member 41 and the adjusting screw 45 are provided in the groove of the first handle 33, and the second end of the rod-shaped member 41 contacts the adjusting screw 45. The adjusting screw 45 is connected to the tail of the first handle 33 by a thread. A part of the adjusting screw 45 extends in the groove of the first handle 33, and the other part is placed outside the first handle 33. When the adjusting screw 45 moves relative to the first handle 33, the adjusting screw 45 causes the second end of the rod-shaped member 41 to move relative to the first handle 33.

[0167] In the water pump pliers of this embodiment, the limiting mechanism is used to limit the displacement of the rod-shaped member relative to the second handle. The limiting mechanism includes a waist-shaped hole 491 provided on the second working part and a limiting shaft 49 provided in the waist-shaped hole 491. The rod-shaped member 41 is pivotally connected to the second handle 34 through the limiting shaft 49. The limiting shaft 49 cooperates with the waist-shaped hole 491 to form the limiting mechanism. When the limiting shaft 49 is in the waist-shaped hole 491 and faces the first handle 33, the first working part 31 and the second working part 32 are in a loose state; when the limiting shaft 49 is in the waist-shaped hole 491 and is away from the first handle 33, the first working part 31 and the second working part 32 are in a clamped state.

[0168] A third handle 50 is also disposed in the groove of the second handle 34. The third handle 50 is connected to the second handle 34 and is connected to the first end of the rod-shaped member 41 through a stopper shaft 49. The portion 48 where the third handle 50 is connected to the second handle 34 is separated from the portion 47 where the second handle 34 is connected to the second working portion 32, and the portion 48 where the third handle 50 is connected to the second handle 34 is separated from the portion where the third handle 50 is connected to the rod-shaped member 41. The length of the second handle 34 is greater than the length of the third handle 50.

[0169] During the rotation of the second handle 34, the connection point between the rod-shaped member 41 and the third handle 50 will cross the line formed by the connection point 48 of the third handle 50 and the second handle 34 and the connection point 47 of the second handle 34 and the second working part 32. When the second handle 34 approaches the first handle 33 and crosses the line, the first working part 31 and the second working part 32 are clamped; when the second handle 34 moves away from the first handle 33 and crosses the line, the first working part 31 and the second working part 32 are released.

[0170] In the water pump pliers of this embodiment, the elastic member 42 is arranged between the second working part 32 and the first handle 33. Specifically, a hanging hole 44 is arranged on the second working part 32, a hook portion 43 is arranged on the first handle 33, one end of the elastic member 42 is restricted in the hanging hole 44, and the other end is connected to the hook portion 43 on the first handle 33. The elastic member 42 is a spring, specifically a tension spring.

[0171] Fig. 9 Another embodiment of the present invention is shown, which provides a hand tool, specifically a self-adjusting water pump pliers, including a first handle 53, a second handle 54, a first working part 51, a second working part 52, a working part connecting mechanism 400, a rod-shaped member 61, a sliding mechanism 64, a locking mechanism and an adjusting mechanism. The first handle 53 and the first working part 51 are fixedly connected, and the two can also be formed in one piece. The second handle 54 is pivotally connected to the second working part 52.

[0172] In this embodiment, the working part connecting mechanism 400 adopts the double-axis setting as described above, that is, it includes a first hole provided on the first working part 51, a first groove 58 provided on the second working part 52, and a first shaft 57 that passes through the first hole and the first groove 58; a second hole provided on the second working part 52, a second groove 60 provided on the first working part 51, and a second shaft 59 that passes through the second hole and the second groove 60. The first shaft 57 is closer to the jaw formed by the first working part 51 and the second working part 52 than the second shaft 59. The first shaft 57 can move and rotate in the first groove 58, and the second shaft 59 can move and rotate in the second groove 60, so that the second working part 52 can rotate and translate relative to the first working part 51. The first groove 58 and the second groove 60 are arc grooves, and can also be square grooves. As an alternative embodiment, the working part connection mechanism 400 may also adopt a single-axis setting as described above (not shown here), that is, the working part connection mechanism 400 includes a hole provided on the first working part 51, a groove provided on the second working part 52, and an axis passing through the hole on the first working part 51 and the groove on the second working part 52. If it is a single-axis setting, the groove may be a horizontal groove, an oblique groove, or an arc groove.

[0173] In this embodiment, the second working part 52 has a first position and a second position. The second working part 52 is connected to the first working part 51 through the working part connecting mechanism 400. When the second handle 54 moves from being away from the first handle 53 to being close to the first handle 53, the working part connecting mechanism 400 causes the second working part 52 to move from the first position to the second position. Here, the first position of the second working part 52 refers to the position of the second working part 52 when it is away from the first working part 51. When the second working part 52 is in the second position, compared with the first position, the second working part 52 has rotated and translated relative to the first working part 51.

[0174] In this embodiment, the clearance between the first shaft 57 and the first hole and the first slot 58 is smaller than the clearance between the second shaft 59 and the second hole and the second slot 60. In an alternative embodiment of this embodiment, the clearance between the first shaft 57 and the first hole and the first slot 58 can also be set to be equal to or greater than the clearance between the second shaft 59 and the second hole and the second slot 60. As mentioned above, one function of setting two shafts is to reduce the wear of the shafts and the deformation of the force-saving pliers by jointly bearing the external force through the two shafts, and another function is to limit the size of the jaws through the second shaft 59.

[0175] In this embodiment, the sliding mechanism 64 is slidably mounted on the first handle 53, one end of the rod-shaped member 61 is pivotally connected to the second handle, and the other end is pivotally mounted on the sliding mechanism. The end of the rod-shaped member 61 connected to the sliding mechanism 64 is composed of a curved segment, and the curvature of the curved segment close to the first handle 53 is greater than the curvature of the curved segment away from the first handle 53.

[0176] The locking mechanism can be slidably mounted on the first handle 53 and is located on the distal end side of the sliding mechanism 64 close to the first handle 53. The distal end here refers to the end away from the jaws. The locking mechanism includes a guide rod 67 and a locking plate 68. The guide rod 67 is mounted on the first handle 53 and penetrates the locking plate 68. The locking plate 68 is composed of multiple pieces, and the multiple locking plates 68 fit each other. The cross section of the guide rod 67 is a rounded trapezoid. The middle of the locking plate 68 has a hole for the guide rod 67 to pass through. The hole is set to have a rounded trapezoid with the same cross-sectional shape as the guide rod 67. The guide rod 67 and the locking plate 68 are clearance-matched.

[0177] In this embodiment, the adjustment mechanism is mounted on the guide rod 67, between the sliding mechanism and the locking mechanism, and the adjustment mechanism is configured to be displaceable in the length direction of the guide rod 67. When the adjustment mechanism reaches the maximum displacement toward either end of the guide rod 67, when the water pump pliers of this embodiment are locked, the end of the rod-shaped member 61 connected to the sliding mechanism can contact the adjustment mechanism.

[0178] Specifically, the adjustment mechanism includes an adjustment screw 66 and a carrier 65, wherein the carrier 65 is mounted on a guide rod 67, and the adjustment screw 66 is mounted on the carrier 65 and can be displaced relative to the carrier 65 along the direction of the guide rod 67. The cross section of the carrier 65 is the same as that of the locking plate 68, and a hole having the same shape and size as that of the locking plate 68 is provided at the same position as the locking plate 68, and the guide rod 67 passes through the hole on the carrier 65.

[0179] In this embodiment, a groove is provided in the second handle 54, the opening of the groove faces the first handle 53, and a third handle 69 is pivotably connected to the groove of the second handle 54. The third handle 69 has an elongated end, and when the third handle 69 pivots relative to the second handle 54, the elongated end can abut against the second handle 54 to prevent the third handle 69 from continuing to pivot relative to the second handle 54. In addition, the rod-shaped member 61 has a protrusion 511, and when the protrusion 511 on the rod-shaped member 61 enters the groove of the second handle 54, the water pump pliers are locked; when the third handle 69 is rotated toward the direction of the second handle 54, the elongated end can push the protrusion 511 out of the groove of the second handle 54, so that the water pump pliers are unlocked.

[0180] The self-adjusting water pump pliers of this embodiment further include an elastic member 62 disposed between the second working portion and the first handle. Specifically, a hanging hole 64 is disposed on the second working portion 52, a hook portion 63 is disposed in the groove of the first handle 53, one end of the elastic member 62 is restricted in the hanging hole, and the other end is connected to the hook portion 63. The elastic member 62 of this embodiment is a spring, specifically a tension spring.

[0181] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A hand tool, characterized in that: include: A first handle and a first working portion fixedly connected to the first handle; a second handle and a second working portion pivotably connected to the second handle; The second working portion has a first position and a second position; as well as a working part connecting mechanism, wherein the second working part is connected to the first working part through the working part connecting mechanism, and the working part connecting mechanism is configured such that when the second handle moves from being away from the first handle to being close to the first handle, the working part connecting mechanism causes the second working part to move from the first position to the second position; Wherein, the first position is the position of the second working part when it is away from the first working part. When the second working part is in the second position, compared with the first position, the second working part has rotated and translated relative to the first working part; The working part connecting mechanism comprises: A first hole disposed on the first working part, a first groove disposed on the second working part, and a first shaft passing through the first hole and the first groove; a second hole disposed on the second working portion, a second groove disposed on the first working portion, and a second shaft passing through the second hole and the second groove; The first axis is closer to a clamping or shearing region formed by the first working portion and the second working portion than the second axis; The first shaft can move and rotate in the first groove, and the second shaft can move and rotate in the second groove, so that the second working part can rotate and translate relative to the first working part; The second axis limits the size of a jaw or a shearing opening formed by the second working part rotating about the first axis relative to the first working part.

2. The hand tool according to claim 1, characterized in that: The groove is a horizontal groove, an oblique groove or an arc groove.

3. The hand tool according to claim 1, characterized in that: The fitting clearance between the first shaft and the first hole and the first groove is greater than, less than or equal to the fitting clearance between the second shaft and the second hole and the second groove.

4. The hand tool according to claim 1, characterized in that: The first groove is an arc groove or a square groove.

5. The hand tool according to claim 1, characterized in that: The second groove is a circular arc groove or a square groove.

6. A hand tool, characterized in that: include: A first handle and a first working portion fixedly connected to the first handle; a second handle and a second working portion pivotably connected to the second handle; The second working portion has a first position and a second position; a working part connecting mechanism, wherein the second working part is connected to the first working part through the working part connecting mechanism, and the working part connecting mechanism is configured such that when the second handle moves from being away from the first handle to being close to the first handle, the working part connecting mechanism causes the second working part to move from the first position to the second position; as well as a rod-shaped member, the rod-shaped member being arranged between the second handle and the first handle; Wherein, the first position is the position of the second working part when it is away from the first working part. When the second working part is in the second position, compared with the first position, the second working part has rotated and translated relative to the first working part; The working part connecting mechanism comprises: A first hole disposed on the first working part, a first groove disposed on the second working part, and a first shaft passing through the first hole and the first groove; a second hole disposed on the second working portion, a second groove disposed on the first working portion, and a second shaft passing through the second hole and the second groove; The first axis is closer to a clamping or shearing region formed by the first working portion and the second working portion than the second axis; The first shaft can move and rotate in the first groove, and the second shaft can move and rotate in the second groove, so that the second working part can rotate and translate relative to the first working part; The second axis limits the size of a jaw or a shearing opening formed by the second working part rotating about the first axis relative to the first working part.

7. The hand tool according to claim 6, characterized in that: The groove is a horizontal groove, an oblique groove or an arc groove.

8. The hand tool according to claim 6, characterized in that: The matching clearance between the first shaft and the first hole and the first groove is smaller than, equal to or larger than the matching clearance between the second shaft and the second hole and the second groove.

9. The hand tool according to claim 6, characterized in that: The first groove is an arc groove or a square groove.

10. The hand tool according to claim 6, wherein: The second groove is a circular arc groove or a square groove.

11. The hand tool according to claim 6, characterized in that: The manual tool further includes an elastic member disposed between the second working portion and the first handle.

12. The hand tool according to claim 11, characterized in that The second working part is provided with a hanging hole, the first handle is provided with a hook, one end of the elastic member is restricted in the hanging hole, and the other end is connected to the hook.

13. The hand tool according to claim 6, characterized in that The manual tool also includes an adjusting screw, which is threadedly connected to the tail of the first handle.

14. The hand tool according to claim 13, wherein: The rod-shaped member has a first end and a second end. The first end of the rod-shaped member is pivotally connected to the second handle, and the second end of the rod-shaped member is pivotally connected to the first handle and abuts against the adjusting screw.

15. The hand tool according to claim 14, wherein: When the adjusting screw moves relative to the first handle, the adjusting screw causes the second end of the rod-shaped member to move relative to the first handle.

16. The hand tool according to claim 13, wherein: A groove is arranged in the first handle, and the opening of the groove faces the second handle.

17. The hand tool according to claim 16, wherein: A portion of the adjusting screw extends in the slot of the first handle, and another portion is disposed outside the first handle.

18. The hand tool according to claim 6, wherein: A groove is arranged in the second handle, and the opening of the groove faces the first handle.

19. The hand tool according to claim 18, wherein: A third handle is pivotally connected in the slot of the second handle.

20. The hand tool according to claim 19, wherein: The length of the third handle is shorter than the length of the second handle.

21. The hand tool according to claim 19, wherein: The third handle has an elongated end, and when the third handle pivots relative to the second handle, the elongated end can abut against the second handle to prevent the third handle from continuing to pivot relative to the second handle.

22. The hand tool according to claim 21, characterized in that The rod-shaped member has a protrusion, and when the protrusion enters the groove of the second handle, the manual tool is locked; by rotating the third handle toward the second handle, the slender end can push the protrusion out of the groove of the second handle, so that the manual tool is unlocked.

23. The hand tool according to claim 19, wherein: The portion where the third handle is connected to the second handle is separated from the portion where the rod-shaped member is connected to the second handle, and is further away from the second working portion than the portion where the rod-shaped member is connected to the second handle.

24. The hand tool according to claim 23, wherein: The portion where the rod-shaped member is connected to the second handle and the portion where the second working portion is connected to the second handle are separated.

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