Self-adaptive self-locking clamping device

Abstract

The object of the present invention is to provide a novel self-locking clamping device that can maintain engagement in a self-adaptive manner even when the structure is deformed during use, ensuring a stable locked state even when the structure is deformed in a way that conventional fixed pivot structures cannot. [Solution] The present invention includes a first arm, a second arm, a ratchet arc fixed to one of the arms, and a pawl mechanism supported on the other arm via a variable pivot. The variable pivot can move in position in response to elastic deformation of the arm when the pawl mechanism engages with the ratchet arc, achieving self-adaptive engagement. The elastic member constantly biases the pawl mechanism in the ratchet direction, but the pawl mechanism can be released by user operation. This allows for consistent locking performance regardless of structural deformation.

Description

[Technical Field]

[0001] The present invention relates to a self-adaptive, self-locking clamping device with adjustable clamping gap and clamping force and a self-adaptive, self-locking function, which can be used in applications such as lock clamps, jar openers, and oil filter wrenches. The device provides a quickly adjustable variable gap and is adaptable to a wide range of workpiece sizes, including wood, jar lids, and oil filters. The device also provides adjustable clamping force and self-locking functionality. Furthermore, the device includes a self-adaptive locking mechanism that maintains the self-locking engagement even when the clamping device body undergoes geometric and elastic deformation under stress.

[0002] (Reference to related application) This application claims the benefit of U.S. Provisional Application No. 63 / 447,333, filed February 21, 2023. [Background technology]

[0003] Many applications, such as jar openers, oil filter wrenches, and woodworking clamps, require a variable clamping gap that can be quickly adjusted to accommodate a wide range of workpiece sizes. Examples of workpiece sizes include jar lid diameters, oil filter diameters, and lumber widths. These applications also require a constant clamping force to be applied to the workpiece during operation, allowing the user to securely hold or rotate the workpiece using friction. Therefore, a clamping device with a self-locking mechanism that allows for quick adjustment of the clamping gap and clamping force and eliminates the need for the user to continuously maintain the clamping force is needed. This self-locking mechanism is particularly advantageous for individuals with weak grip strength due to illnesses such as arthritis or advanced age, or for those lacking the dexterity required for clamping operations.

[0004] In woodworking clamp applications, a scissor linkage mechanism is used, with a fulcrum located at the center of the device body, and the load and operating force are distributed to both sides of the fulcrum. Prior art and commercially available tools utilize arc-motion pawl and ratchet self-locking mechanisms similar to those of the present invention. However, these devices suffer from geometric elastic deformation due to the clamping force, which causes the arc-motion path of the self-locking components to be inconsistent, resulting in problems with the pawl or ratchet failing to engage or disengage, significantly limiting their practical use. In jar opener and oil filter wrench applications, the fulcrum is located at one end and the load and operating force are located at the other end, making the deformation problem even more pronounced, and similar self-locking mechanisms have not been adopted. Jar openers traditionally use open clamps without self-locking functions, while oil filter wrenches traditionally use strap wrenches or pliers wrenches.

[0005] Thus, the present invention addresses the need to provide a self-adapting, self-locking mechanism that allows for quick adjustment of clamp gap and clamp force and maintains the clamp gap and clamp force under stress and deformation. Summary of the Invention [Problem to be solved by the invention]

[0006] SUMMARY OF THE INVENTION A primary object of the present invention is to provide a self-adapting self-locking mechanism that provides rapid clamp gap and clamp force adjustment and self-adapting self-locking capability.

[0007] A second objective is to provide a self-adapting, self-locking mechanism with an integrated pawl and ratchet locking mechanism for applications requiring high clamping forces.

[0008] Another object is to provide a self-adapting, self-locking mechanism with separate pawl and ratchet locking mechanisms that require significantly higher clamping forces and distribute the load evenly across multiple pawls and ratchet teeth.

[0009] To the accomplishment of the foregoing and related ends, the invention is embodied in the preferred embodiments illustrated in the accompanying drawings. It should be noted, however, that the drawings are for illustrative purposes only and that other embodiments may be possible which will achieve the same objectives. Other objects, features and advantages of the present invention will be better understood when considered in conjunction with the accompanying drawings, in which: Figures relating to preferred embodiments are shown below. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view of a preferred embodiment of a self-adapting, self-locking tightening device applied as a locking clamp; FIG. [Figure 2] 2 is a perspective view of the lock clamp of FIG. 1 as seen from the opposite direction. FIG. [Figure 3] FIG. 2 is an exploded perspective view of the lock clamp of FIG. 1. [Figure 4] 2 is a combined orthogonal and cross-sectional view of the locking clamp of FIG. 1; [Figure 5] FIG. 2 is a perspective view of a first arm used in the lock clamp of FIG. 1. [Figure 6] FIG. 2 is a perspective view of a second arm used in the locking clamp of FIG. 1. [Figure 7] FIG. 2 is a perspective view of an integrated pawl trigger used in the locking clamp of FIG. 1. [Figure 8] FIG. 2 is a perspective view of a ratchet arc used in the locking clamp of FIG. 1. [Figure 9] FIG. 1 is a cross-sectional view showing the self-locking mechanism when the locking clamp is tightened onto a piece of wood in an ideal state, where no geometric deformation occurs in the locking clamp. [Figure 10] 1 is a cross-sectional view showing a self-adaptive self-locking mechanism when the locking clamp is tightened to a piece of wood in an actual use situation, where geometric deformation occurs in the locking clamp. [Figure 11] 1 is a perspective view of a preferred embodiment of a self-adapting, self-locking fastening device applied as a jar opener. FIG. [Figure 12]FIG. 12 is a perspective view of the jar opener of FIG. 11 viewed from the opposite direction. [Figure 13] FIG. 12 is an exploded perspective view of the jar opener of FIG. 11. [Figure 14] 12 is a combined orthogonal and cross-sectional view of the jar opener of FIG. 11. [Figure 15] FIG. 12 is a perspective view of a first arm used in the jar opener of FIG. 11. [Figure 16] FIG. 12 is a perspective view of a second arm used in the jar opener of FIG. 11. [Figure 17] FIG. 12 is a perspective view of an integrated pawl trigger used in the jar opener of FIG. 11. [Figure 18] FIG. 12 is a perspective view of a ratchet arc used in the jar opener of FIG. 11. [Figure 19] FIG. 12 is a perspective view showing an operating state in which the jar opener of FIG. 11 acts on a jar lid. [Figure 20] FIG. 20 is a cross-sectional view showing the self-locking mechanism of the jar opener shown in FIG. 19 acting on the jar lid in an ideal state, with no geometric deformation occurring. [Figure 21] 20 is a cross-sectional view showing the self-adaptive self-locking mechanism of the jar opener shown in FIG. 19 acting on the jar lid in actual use, where geometric deformation occurs. [Figure 22] 1 is a perspective view of a preferred embodiment of a self-adapting, self-locking tightening device applied as an oil filter wrench; FIG. [Figure 23] FIG. 23 is a perspective view of the oil filter wrench of FIG. 22, seen from the opposite direction. [Figure 24] FIG. 23 is an exploded perspective view of the oil filter wrench of FIG. 22. [Figure 25] 23 is a combination of an orthogonal projection view and a cross-sectional view of the oil filter wrench of FIG. 22. [Figure 26] FIG. 23 is a perspective view of a first arm used in the oil filter wrench of FIG. 22. [Figure 27] FIG. 23 is a perspective view of a second arm used in the oil filter wrench of FIG. 22. [Figure 28]FIG. 23 is a perspective view of a linkage trigger used in the oil filter wrench of FIG. 22. [Figure 29] FIG. 23 is a perspective view of a pawl used in the oil filter wrench of FIG. 22. [Figure 30] FIG. 23 is a perspective view of a ratchet arc used in the oil filter wrench of FIG. 22. [Figure 31] FIG. 23 is a perspective view showing the oil filter wrench of FIG. 22 being used to tighten an oil filter. [Figure 32] FIG. 23 is a perspective view showing the oil filter wrench of FIG. 22 being used to loosen the oil filter. [Figure 33] 33 is a composite projection and cross-sectional view of the oil filter wrench and oil filter of FIG. 32, showing the self-locking mechanism in an ideal state, with no geometric deformation of the oil filter wrench. [Figure 34] FIG. 33 is a composite view of a projection and a cross section of the oil filter wrench and oil filter of FIG. 32, showing the self-adaptive self-locking mechanism in actual use, with geometric deformation occurring in the oil filter wrench.

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[0044] (Intentional spaces added to align paragraph numbers with the original text) DETAILED DESCRIPTION OF THE INVENTION

[0045] Examples of embodiments of the present invention are provided below. These embodiments specifically illustrate how the present invention can be implemented. While the illustrated embodiments are described in the context of a locking clamp, a jar opener, and an oil filter wrench, the present invention is also applicable to many other applications where maintaining clamping force through a self-adapting, self-locking function is useful, such as a lemon squeezer. In the following description, preferred embodiments are disclosed in detail to illustrate the principles of the present invention. Therefore, it should be noted that these preferred embodiments are merely examples of many potential embodiments, and that the structural and functional details described herein are not intended to limit the present invention, but are merely exemplary representations and illustrative of the principles of the present invention.

[0046] In the disclosure, the same reference numerals refer to the same elements in all drawings. Terms indicating positions such as "top," "bottom," "upper," "lower," "front," and "rear" are based on the positions shown in the drawings. Terms such as "first," "second," "third," "fourth," "last," "one side," and "the other side" are used to arbitrarily distinguish positions and / or orders described or illustrated. In drawings that combine orthogonal projections, cross-sectional views, and perspective views, reference numerals may be omitted to avoid impairing the clarity of the drawings, but the correspondence of parts is clear from the other drawings.

[0047] 1 and 2 show the self-adapting, self-locking clamping device in an open state in a locking clamp according to a preferred embodiment of the present invention.

[0048] 3 and 4 further illustrate the configuration of the locking clamp, which may include a first arm 1, a second arm 2, an integral pawl trigger 3, a ratchet arc 4, a compression spring 5, a torsion spring 6, a pair of clamp heads 7, and a plurality of pins 8 and 9.

[0049] First arm 1 (FIGS. 3, 4, 5) has an elongated body resembling an elongated "S" shape, with jaw portion 1a at one end, pivot portion 1b in the middle, and handle portion 1c at the other end. Longitudinal edges 1l and 1m define the width of first arm 1. A pair of spaced hinge seats 1d and 1e are disposed at the ends of jaw portion 1a and are parallel and symmetrical about central plane AB (FIG. 4). Hinge seats 1d and 1e are penetrated by boreholes 1f perpendicular to plane AB and pivotally receive clamp head 7 via pin 9 (FIG. 3). Pivot portion 1b further has a stepped engagement surface 1g offset from longitudinal edge 1l to mate with a corresponding engagement surface on second arm 2 to form a scissors linkage. The handle portion 1c also has a "V" shaped recess 1h for receiving the torsion spring 6, and a borehole 1i passing through the recess 1h and perpendicular to the plane AB, which is pivotally connected to the torsion spring 6 via a pin 8 and is arranged coaxially with a corresponding borehole in the second arm 2 to form a spring pivot and fulcrum. The handle portion 1c may have a recess 1j for fixing and receiving the engaging end of the ratchet arc 4, and a borehole 1k passing through the recess 1j and perpendicular to the plane AB, which may fix the ratchet arc 4 via a pin 9.

[0050] The second arm 2 (FIGS. 3, 4, 6) may have a body similar in shape to the first arm 1, with a jaw portion 2a at one end, a central pivot portion 2b, and a handle portion 2c at the other end. Longitudinal edges 2p and 2q define the width of the second arm 2. A pair of spaced hinge seats 2d and 2e are disposed at the ends of the jaw portion 2a and are parallel and symmetrical to a central plane AB (FIG. 4). Boreholes 2f, perpendicular to the plane AB, penetrate the hinge seats 2d and 2e and pivotally receive the other clamp head 7 via pin 9 (FIG. 3). The pivot portion 2b has a stepped engagement surface 2g offset from the longitudinal edge 2p that mates with the engagement surface 1g of the first arm 1 to form a scissors linkage. The handle portion 2c also has a "V"-shaped recess 2h paired with recess 1h, a borehole 2i extending through recess 2h and perpendicular to plane AB, and a pin 8 pivotally connected to torsion spring 6 and positioned coaxially with borehole 1i. The handle portion 2c has a pair of hinge seats 2k and 2j protruding laterally opposite each other adjacent to pivot portion 2b. A slot 2l extending perpendicular to plane AB through hinge seats 2k and 2j receives pin 9 (fourth pin) for pivotal and sliding movement. The handle portion 2c also has a lateral passage 2m and a circular recess 2o for fixedly receiving one end of compression spring 5. Passage 2m has a bottom arc surface 2n (Fig. 4) with a radius R1 designed around axis A1, which slidably receives ratchet arc 4.

[0051] The integrated pawl trigger 3 (FIGS. 3, 4, and 7) has a curved, longitudinal body resembling a trigger shape and may include a hinge seat portion 3a, an integrated pawl portion 3b, and a lever portion 3c. Longitudinal edges 3j and 3k define the width of the integrated pawl trigger 3. The hinge seat portion 3a has a hinge seat 3d offset from both longitudinal edges 3k and 3j and a borehole 3e perpendicular to plane AB (FIG. 4), sized and shaped to fit into the gap between the pair of hinge seats 2k and 2j. The borehole 3e extends through slot 21 and connects with fourth pin 9 to form a floating pivot, allowing the integrated pawl trigger 3 to rotate about the axis of fourth pin 9. The fourth pin 9 is slidable within slot 2l. The travel limiting pin and slot mechanism allows the integrated pawl trigger 3 to move up and down and rotate, self-adapting to the movement of the ratchet arc 4 due to the geometric deformation of the first and second arms 1 and 2 caused by the compression force, thereby achieving a self-adapting, self-locking function. The integrated pawl portion 3b includes a lateral passage 3f that slidingly receives the ratchet arc 4, and has an integrated pawl tooth 3g formed on the side adjacent to the lever portion 3c and a compression edge 3h formed on the opposite side. The compression edge 3h is perpendicular to the plane AB and approximately parallel to the edge of the integrated pawl tooth 3g. The lever portion 3c includes a laterally protruding cylinder 3i that fixedly receives the other end of the compression spring 5.

[0052] In the preferred embodiment, a single pawl tooth 3g is integrated into the integral pawl trigger 3, although in other embodiments multiple pawl teeth may be integrated or attached.

[0053] Ratchet arc 4 (FIGS. 3, 4, 8) may have an elongated, arc-like body and include an engagement end 4a and a ratchet portion 4b. Longitudinal edges 4f and 4g define the width of the body. Engagement end 4a has a borehole 4c perpendicular to plane AB (FIG. 4), is fixedly fitted into recess 1j, and is coaxial with borehole 1k in first arm 1 and secured via second pin 9. Ratchet portion 4b includes, upon assembly, a side arc surface 4d of radius R2 centered on axis A1 and a side integral ratchet surface 4e of radius R1 also centered on axis A1. Ratchet portion 4b is sized and shaped to smoothly slide through slot 3f and passageway 2m (FIG. 4).

[0054] In the assembled configuration, pivot portions 1b and 2b connect with torsion spring 6 and pin 8 to form a scissors link spring pivot and fulcrum on axis A1 (FIG. 4), and jaw portions 1a and 2a form a pair of jaws with a variable gap for clamping a workpiece. Handle portions 1c and 2x form a pair of handles for applying a compression force. Torsion spring 6 generates a spring force that pushes the pair of handles apart. Integrated pawl trigger 3 is pivotally connected to slot 2l in second arm 2 and pivots at the bottom of slot 2l. Ratchet arc 4 is slidingly received by integrated pawl trigger 3 and second arm 2. Compression spring 5 is supported between second arm 2 and integrated pawl trigger 3 and applies a spring force to integrated pawl trigger 3, rotating it away from second arm 2. This causes the compression edge 3h to engage the side arc surface 4d, and the integrated pawl teeth 3g to fully engage the opposite integrated ratchet surface 4e, forming a self-locking mechanism between the pawl and the ratchet. When a user applies compression force to the pair of handles, the ratchet arc 4 rotates the integrated pawl trigger 3 toward the second arm 2, disengaging the pawl from the ratchet and sliding forward toward the slot 2m, narrowing the gap between the pair of jaws. When the compression force is released, the compression spring 5 rotates the integrated pawl trigger 3 away from the second arm 2, causing the compression edge 3h to engage the side arc surface 4d and the integrated pawl teeth 3g to fully engage the integrated ratchet surface 4e, preventing the ratchet arc 4 from sliding backward. Thus, the locking clamp is self-locked in a fixed position. When the integrated pawl trigger 3 is pulled toward the handle portion 2c, the compression edge 3h and the integrated pawl tooth 3g are lifted from the side arc surface 4d and the integrated ratchet surface 4e, the engagement between the pawl and the ratchet is released, and the torsion spring 6 further pushes the pair of handles apart until the pair of jaws reaches the maximum gap.

[0055] Figures 9 and 10 illustrate the operation of the self-adapting, self-locking mechanism, which securely clamps the locking clamp to a workpiece (e.g., a piece of wood 40) and maintains a constant clamping force even after the user releases the clamping force. Figure 9 is a cross-sectional view of the ideal state, taken along plane AB of Figure 4, showing no geometric deformation of first arm 1 and second arm 2. In the ideal state, ratchet arc 4 slides forward in a circular motion along arc surface 2n about axis A1, and integrated pawl trigger 3 rotates at the bottom pivot position of slot 2l. Figure 10 is a cross-sectional view of the actual state, showing geometric deformation of first arm 1 and second arm 2 due to elastic deformation of the material caused by stress. In this case, handle portions 1c and 2c bend inward, ratchet arc 4 tilts upward from arc surface 2n, and integrated pawl trigger 3 is pushed up from its bottom pivot position and rotates to another position within slot 2l, maintaining engagement between the pawl and the ratchet while self-adapting to the movement of ratchet arc 4. This allows most of the energy used in tightening to be stored as elastic deformation of first arm 1 and second arm 2, maintaining a strong grip on the underlying workpiece.

[0056] 11 and 12 show the self-adapting, self-locking clamping device in the open position of the jar opener according to the preferred embodiment of the present invention.

[0057] 13 and 14 further illustrate the configuration of the jar opener, which may include a first arm 11, a second arm 12, an integral pawl trigger 13, a ratchet arc 14, a compression spring 15, a pair of first clamp pads 16, a pair of second clamp pads 17, and a plurality of pins 18 and 19.

[0058] First arm 11 (FIGS. 13, 14, and 15) may have a curved, elongated body and include pivot portion 11a at one end, twin jaw portion 11b at the middle, and handle portion 11c at the other end. The width of the body is defined by longitudinal edges 11l and 11m. Pivot portion 11a may further include a pair of spaced-apart hinge seats 11d and 11e, which may be sized and shaped to couple with a corresponding pair of hinge seats on second arm 12 to form a first pivot and fulcrum. Pivot portion 11a may also include a borehole 11f oriented substantially perpendicular to plane CD shown in FIG. 14 and configured to rotatably receive pin 18 through hinge seats 11d and 11e. The twin jaw portion 11b may further include a first twin curved side surface 11g, a laterally extending twin curved reinforcing rib 11i, and a second twin curved side surface 11h, which may be stacked in parallel in the width direction. The first and second twin curved side surfaces 11g and 11h are designed to engage with corresponding twin curved side surfaces of the second arm 12, forming a pair of jaws with a variable gap that can cover most sizes of standard and non-standard jar or container lids, thereby achieving universal opening functionality with a single jar opener. The twin reinforcing rib 11i is designed to strengthen the rigidity of the first arm 11 and reduce geometric deformation during operation on a workpiece. At the same time, it also serves as a support surface for the jar or container lid, improving the frictional force and operational stability between the jar opener and the lid. The twin reinforcing rib 11i may be coated with a high-friction material, such as rubber, to further improve stability and frictional force. The handle portion 11c may further include a recess 11j for fixedly receiving the anchor end of the ratchet arc 14, and the recess 11j may be provided with a borehole 11k extending substantially perpendicular to the plane CD and configured to secure the ratchet arc 14 in place via a pin 19.

[0059] The second arm 12 (FIGS. 13, 14, 16) may have a body similar in shape to the first arm 11, including a pivot portion 12a at one end, a twin jaw portion 12b in the middle, and a handle portion 12c at the other end. Longitudinal edges 12o and 12p of the body define a width. The pivot portion 12a further includes a pair of spaced hinge seats 12d and 12e shaped and dimensioned to mate with a corresponding pair of hinge seats 11d and 11e of the first arm 11 to form a first pivot and fulcrum. Also, a borehole 12f is formed through the pair of hinge seats 12d and 12e, generally perpendicular to the plane CD (FIG. 14), and is coaxially aligned with the borehole 11f to pivotally receive the pin 18. The twin jaw portion 12b has the same structure and function as the corresponding twin jaw portion 11b, and includes a first twin curved surface 12g, a lateral twin curved reinforcing ridge 12i, and a second twin curved surface 12h, which are juxtaposed in the width direction. Handle portion 12c includes a laterally projecting hinge seat 12j adjacent to twin jaw portion 12b and offset from longitudinal edges 12o and 12p, a generally longitudinally disposed slot 12k extending through hinge seat 12j and perpendicular to plane CD (for pivotally and slidably receiving second pin 19), a lateral passage 12l adjacent hinge seat 12j (for slidably receiving ratchet arc 14), and a lateral circular recess 12n for fixedly receiving one end of compression spring 15. Passage 12l has a threshold 12m (FIG. 14) at its entrance, which is designed to prevent ratchet arc 14 from sliding rearward when positioned above the threshold.

[0060] The integral pawl trigger 13 (FIGS. 13, 14, 17) has a trigger-like curved longitudinal body and may include a hinge seat portion 13a and an integral pawl lever portion 13b. Longitudinal edges 13h and 13i of the body define a width. The hinge seat portion 13a is generally perpendicular to the plane CD (FIG. 14) and includes a pair of fork-shaped arms 13c and 13d at the end of the hinge seat portion 13a (branching from the integral pawl lever portion 13b along the longitudinal edges 13h and 13i and generally symmetrical with respect to the plane CD), and a first borehole 13e extending through the pair of fork-shaped arms 13c and 13d. Furthermore, a second borehole 13f is provided intermediate the pair of fork-shaped arms 13c and 13d and generally parallel to the first borehole 13e. The pair of fork-shaped arms 13c and 13d are coupled to the hinge seat 12j, and the borehole 13e is aligned with the slot 12k to fixedly receive a second pin 19, thereby forming a variable pivot. The integrated pawl trigger 13 rotates about the axis of the second pin 19, which slidably moves within the slot 12k. The second borehole 13f fixedly receives a third pin 19 and forms the compression end of the integrated pawl trigger 13 and the path of the ratchet arc 14. The slot and pin travel limiting mechanism allows the integrated pawl trigger 13 to move up and down and rotate, self-adapting to the movement of the ratchet arc 14 that accompanies geometric deformation of the first and second arms 11, 12 caused by compression force, thereby achieving a self-adapting, self-locking function. The integrated pawl lever portion 13b includes a pawl tooth 13g integrally formed between and adjacent to the fork-shaped arms 13c and 13d and a laterally protruding cylindrical portion 13j that fixedly receives the other end of the compression spring 15. The space surrounded by the fork-shaped arms 13c and 13d, the integrated pawl tooth 13g, and the third pin 19 forms a path that slidably receives the ratchet arc 14.

[0061] In the preferred embodiment, a single pawl tooth 13g is integrated into the integral pawl trigger 13, although in other embodiments multiple pawl teeth may be integrated into or attached to the integral pawl trigger 13.

[0062] The ratchet arc 14 (FIGS. 13, 14, 18) may have a longitudinal body similar to an arc shape and include an anchor end 14a and a ratchet portion 14b. Longitudinal edges 14g and 14h of the body define a width. The anchor end 14a has a borehole 14c generally perpendicular to plane AB (FIG. 4) that is fixedly received in a recess 11j of the first arm 11 and secured via a first pin 19 and aligned borehole 11k. When assembled, ratchet portion 14b includes a side arc 14d of radius R4 centered on axis A2, an integrally molded ratchet face 14e (FIG. 14) of radius R3 centered on coaxial axis A2, and a laterally protruding stop ridge 14f at its distal end which cooperates with threshold 12m (FIG. 14) to prevent ratchet arc 14 from sliding rearwardly out of path 12l. Ratchet portion 14b is sized and shaped to slide smoothly along the path between borehole 13f, in which integral pawl tooth 13g and third pin 19 are located, and path 12l.

[0063] The pair of first clamping pads 16 and the pair of second clamping pads 17 may be made of a high-friction and elastic material such as rubber and are bonded or fused in a suitable manner to the first and second twin curved surfaces 11g and 11h of the first arm 11 and the first and second twin curved surfaces 12g and 12h of the second arm 12. These clamping pads are used to minimize deformation of the workpiece and improve friction during the twisting operation.

[0064] In the assembled state, pivot portions 11a and 12a and pin 18 form a first pivot and fulcrum on axis A2 (FIG. 14), twin jaw portions 11b and 12b form a pair of twin jaws with multiple variable gaps to clamp a workpiece, and handle portions 11c and 12c form a pair of handles for applying a compressive force. An integral pawl trigger 13 is pivotally connected to second arm 12 and pivots at the bottom of slot 12k. Ratchet arc 14 is fixed to first arm 11 at anchor end 14a, and ratchet portion 14b is slidably received in the path between integral pawl tooth 13g, third pin 19, and path 12l, and is positioned above threshold 12m. Compression spring 15 is supported between second arm 12 and integral pawl trigger 13 and applies a rotational force to integral pawl trigger 13, rotating it away from second arm 12 so that third pin 19 grips arc surface 14d and integral pawl teeth 13g fully engage integral ratchet surface 14e, thereby forming a self-locking mechanism for the pawl and ratchet. When a user applies a compressive force to the handle pair, ratchet arc 14 rotates integral pawl trigger 13 toward second arm 12, disengaging the pawl from the ratchet, and ratchet arc 14 slides forward within path 12l, narrowing the gap between the twin jaws. When the compression force is released, the compression spring 15 rotates the integral pawl trigger 13 away from the second arm 12, fully engaging the integral pawl teeth 13g with the integral ratchet surface 14e and gripping the third pin 19 against the arc surface 14d, preventing the ratchet arc 14 from sliding backward. This self-locks the jar opener in a fixed position. When the integral pawl trigger 13 is pulled toward the second arm 12, the third pin 19 and the integral pawl teeth 13g move away from the arc surface 14d and the integral ratchet surface 14e, disengaging the pawl from the ratchet and allowing the handle pair to move in the opening direction.

[0065] FIG. 19 illustrates the operation of the jar opener to open a jar lid 50 (the jar itself is not shown). The user places the jar lid 50 between the pair of twin jaws and applies a clamping force to the pair of handles. The clamping force closes the gap between the pair of twin jaws, causing the edge of the jar lid to contact either the first clamping pad 16 or the second clamping pad 17, and the top surface of the jar lid to contact one of the reinforcing ridges 11i and 12i. As the user applies further clamping force to the pair of handles, the corresponding pair of resilient clamping pads and the first and second arms 11, 12 deform, providing a firm grip on the jar lid. The user then rotates the pair of first and second arms 11, 12 to the desired position and uses the frictional force on the jar lid to remove the jar lid without having to maintain the clamping force.

[0066] Figures 20 and 21 further illustrate the operation of the self-adapting, self-locking mechanism in the example operation of Figure 19 described above. Figure 20 is a cross-sectional view of the ideal situation of Figure 19, viewed from the same plane CD of Figure 14, in which no geometric deformation occurs in the first and second arms 11 and 12. In the ideal situation, the ratchet arc 14 moves in an arc about the axis A2, sliding along the threshold 12m, and the integrated pawl trigger 13 rotates at the bottom position of the slot 12k. Figure 21 is a cross-sectional view of the actual situation of Figure 19, viewed from the same plane CD of Figure 14, in which geometric deformation occurs in the first and second arms 11 and 12 due to elastic deformation of the material. In this state, handle portions 11c and 12c bend inward, ratchet arc 14 tilts upward from threshold 12m, and integrated pawl trigger 13 is pushed up from its bottom pivot position and pivots to another position within slot 12k, maintaining the engagement between the pawl and the ratchet while self-adapting to the movement of ratchet arc 14 due to the geometric deformation of both arms 11 and 12. Therefore, most of the clamping energy previously applied is stored as elastic deformation of first and second arms 11 and 12 and first or second clamping pad 16, 17, maintaining a strong grip on the workpiece.

[0067] 22 and 23 show the self-adapting, self-locking clamping device in the open position in a preferred embodiment as an oil filter wrench.

[0068] 24 and 25 show the structure of an oil filter wrench. The oil filter wrench may include a first arm 21, a second arm 22, a linkage trigger 23, a pawl 24, a ratchet arc 25, a compression spring 26, a pair of clamping pads 27, and a plurality of pins 28, 29, and 30.

[0069] First arm 21 (FIGS. 24, 25, 26) has a curved longitudinal body with pivot portion 21a at one end, intermediate jaw portion 21b, and handle portion 21c at the other end. Longitudinal body edges 21l and 21k define a width. Pivot portion 21a includes a pair of spaced hinge seats 21d and 21e that mate with corresponding hinge seats on second arm 22 to form a first pivot and fulcrum. A borehole 21f extends generally perpendicular to plane EF (FIG. 25) through the pair of hinge seats 21d and 21e for pivotally receiving pin 28. Jaw portion 21b has a curved surface 21g and a laterally protruding toothed arc 21h arranged widthwise. These, combined with the corresponding curved surface and toothed arc of second arm 22, form a variable elastic gap and variable hard tooth gap, covering a range of commonly used oil filter sizes. Curved surface 21g is designed to bond or fuse with high-friction elastic clamping pad 27, allowing the user to grip the oil filter with the elastic gap and twist it a quarter turn after manual tightening during the tightening operation, without damaging the oil filter body. Toothed arc 21h is designed to cut into the oil filter body and is used in conjunction with clamping pad 27 to loosen the oil filter. The handle portion 21c includes a recess 21i for fixedly receiving the anchor end of the ratchet arc 25, and a borehole 21j extending through the recess 21i and generally perpendicular to the plane EF, for securing the ratchet arc 25 via a first pin 29.

[0070] The second arm 22 (FIGS. 24, 25, 27) may have a body similar in shape to the first arm 21, with a pivot portion 22a at one end, a jaw portion 22b in the middle, and a handle portion 22c at the other end. Longitudinal edges 22o and 22p of the body define its width. The pivot portion 22a may further include a pair of spaced-apart hinge seats 22d and 22e sized and shaped to join with the pair of hinge seats 21d and 21e of the first arm 21 to form a first pivot and fulcrum. The pivot portion 22a may also include a borehole 22f extending generally perpendicular to the plane EF shown in FIG. 25 and passing through the pair of hinge seats 22d and 22e, coaxially aligned with the borehole 21f, for pivotally receiving the pin 28. Jaw portion 22b may have the same structure and function as corresponding jaw portion 21b, including a laterally extending curved surface 22g and laterally protruding curved toothed arcs 22h juxtaposed in the width direction. Handle portion 22c may further include a pair of laterally protruding hinge seats 22i and 22j spaced apart along longitudinal edges 22o and 22p and bridged on the jaw portion 22b side. Handle portion 22c may also include a borehole 22k extending generally perpendicular to plane EF shown in FIG. 25 , passing through the pair of hinge seats 22i and 22j, and pivotally receiving a second pin 29. Furthermore, handle portion 22c may include a lateral passage 22l extending across handle portion 22c, opening between the pair of hinge seats 22i and 22j, and configured to slidably receive ratchet arc 25. The handle portion 22c may also be provided with a lateral circular recess 22n that securely accommodates one end of the compression spring 26. The passage 22l is designed to have a threshold portion 22m (FIG. 25) at its entrance, and the ratchet arc 25 is positioned on this threshold portion 22m to prevent it from sliding out rearward.

[0071] Linkage trigger 23 (FIGS. 24, 25, 28) has a trigger-like, elongated body and may include hinge seat 23a and lever portion 23b. Longitudinal edges 23k and 23l define the width of linkage trigger 23. Hinge seat 23a may further include a pair of laterally branched fork-shaped arms 23c and 23d branching from lever portion 23b and offset from longitudinal edges 23k and 23l, symmetrical with respect to plane EF (FIG. 25). Bridge 23e is provided to bridge upper ends of fork-shaped arms 23c and 23d in the width direction, improving the rigidity of linkage trigger 23. A first through-hole 23f, which passes through bridge 23e and is substantially perpendicular to plane EF, is located at the end adjacent to lever portion 23b and forms a hinge seat for pivotally connecting to a pair of hinge seats 22i and 22j of second arm 22 via a second pin 29, thereby constituting a second pivot axis. A second borehole 23g, which is substantially parallel to first borehole 23f and passes through a pair of fork-shaped arms 23c and 23d, forms a pair of hinge seats for pivotally connecting to claw portion 24 via a first pin 30, thereby constituting a third pivot axis. The third borehole 23h is located at the other end of the first borehole 23f, approximately parallel to the first borehole 23f, and passes through the pair of fork-shaped arms 23c and 23d to form a pair of hinge seats for fixedly receiving the second pin 30 and limiting the rotation range. The lever portion 23b further has a widthwise notch (notch portion) at the end adjacent to the hinge seat portion 23a, which forms a passage 23i extending from the gap between the pair of fork-shaped arms 23c and 23d and can slidably receive the ratchet arc 25. The lever portion 23b also has a widthwise protruding cylindrical portion 23j at its center, which is fixedly received in the other end of the compression spring 26.

[0072] The pawl portion 24 (FIGS. 24, 25, 29) may include a longitudinal body having a pawl head portion 24a and a rotation range limiting portion 24b. Longitudinal edges 24i and 24j define the width of the body. The pawl head portion 24a has a side surface 24c integrally formed with a plurality of pawl teeth. A borehole 24d extends through the pawl head portion 24a approximately perpendicular to face EF (FIG. 25), coaxially connecting the borehole 23g, which constitutes the third pivot of the linkage trigger 23, and the first pin 30. The rotation range limiting portion 24b has a curved slot 24f extending perpendicular to face EF and which receives the second pin 30 for rotational and sliding movement. The slot 24f includes a first arcuate surface 24g and a second arcuate surface 24h centered on the axis A4 (FIG. 25). The pawl 24 rotates around the third pivot axis A4, but its rotation range is limited by the rotation range limiting mechanism formed by the slot 24f and the second pin 30. Therefore, the third pivot of the pawl 24 is a variable pivot, and the third pivot itself rotates around the second pivot, and the pawl rotates around the third pivot. This variable pivot allows the engagement between the pawl and the ratchet arc 25 to self-adaptively adjust in response to movement caused by geometric deformation of the first arm 21 and the second arm 22, thereby achieving an automatic, adaptive, self-locking function.

[0073] Ratchet arc 25 (FIGS. 24, 25, 30) may have an elongated body resembling an arc and include anchor end 25a and ratchet portion 25b. Longitudinal edges 25g and 25h define the width of the body. Anchor end 25a has borehole 25c perpendicular to plane EF (FIG. 25), which is fixedly received in recess 21i and secured by first pin 29 along boreholes 21j and 25c of first arm 21. When assembled, ratchet portion 25b has side arcuate surface 25d of radius R5 centered on axis A3, integrally formed ratchet surface 25e of radius R6 also centered on axis A3, and stop ridge 25f protruding in the width direction at the end, which works in conjunction with threshold 22m (Figure 25) to prevent ratchet arc 25 from sliding rearward. Ratchet portion 25b is sized and shaped to slide smoothly through passages 23i and 22l.

[0074] In the assembled configuration, pivot portions 21a and 22a and pin 28 form a first pivot and fulcrum on axis A3 (FIG. 25), jaw portions 21b and 22b form a pair of jaws with an elastically variable gap, and gripping portions 21c and 22c form a gripping portion for applying a compressive force. Ratchet arc 25 is fixed to first arm 21 via anchor end 25a by first pin 29, and ratchet portion 25b is slidably received in passage 23i of linkage trigger 23 and passage 22l of second arm 22, and is located on threshold 22m. Linkage trigger 23 is rotatably connected to hinge seat 22k and bore hole 23f of second arm 22 via second pin 29 to form a second pivot and is rotatable within the gap between pair of hinge seats 22i and 22j and passage 22l. Pawl 24 is rotatably connected to the gap between pair of fork-shaped arms 23c and 23d of linkage trigger 23 via bore holes 23g and 24d and first pin 30 and is rotatable within the range of the rotation range limiting mechanism defined by slot 24f and second pin 30. Compression spring 26 is supported between linkage trigger 23 and second arm 22 and rotates linkage trigger 23 in a direction away from second arm 22, maintaining pawl 24 fully engaged with ratchet arc 25.

[0075] When the user applies a compressive force to the grip, the ratchet arc 25 pushes the pawl 24 upward, rotating the linkage trigger 23 toward the second arm 22 and disengaging the pawl from the ratchet. Meanwhile, the second pin 30 is secured in the borehole 23h and remains in the lower part of the slot 24f, limiting the rotation of the pawl 24 around axis A4 (Figure 25) and increasing the stability of the relative motion. The ratchet arc 25 slides further forward within the passage 22l, narrowing the gap between the jaws. When the compressive force is released, the compression spring 26 rotates the linkage trigger 23 away from the second arm 22, fully engaging the pawl 24 with the ratchet arc 25 and preventing it from retracting. This self-locks the oil filter wrench in a fixed position. When the linkage trigger 23 is pulled toward the second arm 22, the claw portion 24 is lifted, the engagement between the claw portion and the ratchet is released, and the gripping portion can be opened.

[0076] FIG. 31 shows an example of how a user tightens an oil filter 60. After manually tightening the oil filter 60 onto the engine block, the user places the oil filter between the pair of elastic pads 27 and applies clamping force to the gripping parts. The clamping force narrows the gap between the first and second arms 21 and 22, bringing the oil filter housing into contact with the pair of elastic clamping pads 27. Applying further clamping force deforms the pair of elastic clamping pads 27 and the first and second arms 21 and 22, creating the desired clamping pressure on the oil filter 60 and reducing the possibility of damage to the oil filter housing. The user then rotates the first and second arms 21 and 22, utilizing the frictional force acting on the oil filter 60 to complete the tightening process by approximately one-quarter turn, without needing to continuously apply clamping force.

[0077] FIG. 32 shows an example of a user loosening an oil filter 60. The user places the oil filter 60 between the pair of clamping pads 27 and the pair of toothed arc portions 21h and 22h and applies a clamping force to the gripping portions. The clamping force narrows the gap between the first and second arms 21 and 22, bringing the oil filter housing into contact with the pair of toothed arc portions 21h and 22h. Further application of clamping force causes the teeth of the pair of toothed arc portions 21h and 22h to bite into the oil filter housing, deforming the pair of elastic clamping pads 27 and the first and second arms 21 and 22, and applying a strong gripping force to the oil filter 60. The user then rotates the first and second arms 21 and 22, utilizing the frictional force acting on the oil filter 60 to unscrew the oil filter from the engine block, without needing to continuously apply a clamping force.

[0078] Figures 33 and 34 further illustrate the operation of the self-adaptive, self-locking mechanism in the example oil filter loosening operation shown in Figure 32. Figure 33 shows a cross-section of the oil filter 60 and oil filter wrench along plane EF of Figure 25 in an ideal state where no geometric deformation occurs in the first and second arms 21 and 22. In this state, the clamping force causes the ratchet arc 25 to push up against the pawl 24, which then smoothly disengages from the ratchet arc 25 and moves in an arc about axis A3 along threshold 22m. When the clamping force is released, the pawl 24 and ratchet arc 25 fully engage, locking the gripper in a fixed position. The third pivot remains in the fixed position, and the pawl 24 also rotates within the rotational range limited by the second pin 30 and slot 24f and remains in that position.

[0079] 34 shows a cross-sectional view of the oil filter 60 and oil filter wrench in an actual state where geometric deformation occurs in the first and second arms 21 and 22. In this state, the gripping portions 21c and 22c bend inward, causing the ratchet arc 25 to tilt upward away from the threshold 22m, pushing up the pawl 24. As a result, the linkage trigger 23 rotates toward the second arm 22, and the pawl 24 rotates at a different position on the third pivot while remaining within the rotation range limited by the second pin 30 and slot 24f, maintaining engagement between the pawl and the ratchet while self-adapting to the movement of the ratchet arc 25 caused by the geometric deformation of the first and second arms 21 and 22. As a result, most of the clamping energy applied by the user in the conventional method is stored as elastic deformation of the first and second arms 21 and 22 and the pair of clamping pads 27, and a strong gripping force on the underlying workpiece is maintained.

[0080] In the above examples, it has been demonstrated that the self-adapting self-locking mechanism ensures a very stable locking state even when the gripping device is subjected to large geometric deformations.

Claims

1. 1. A self-adapting, self-locking clamping device comprising: a first arm having a longitudinally curved body and including a jaw portion, a pivot portion, and a handle portion; a second arm having a longitudinally curved body, including a jaw portion, a pivot portion, and a handle portion, the handle portion further including a transverse slot-like notch extending between opposite sides thereof; a ratchet arc having an anchor end and an arcuate ratchet portion, the ratchet portion having an arcuate ratchet surface on one side having a constant radius and an arcuate surface on the other side, the arcuate surface being substantially concentric with the arcuate ratchet surface; an integrated pawl trigger having a longitudinal body and including a pivot portion, an integrated pawl portion, and a lever portion, the integrated pawl trigger further including a transverse slot-like passage sized and shaped to slidably receive a ratchet arc, the passage defining at least one pawl pawl tooth for engaging a ratchet surface and an opposing pressure edge for gripping the arcuate surface, whereby engagement of the pawl pawl tooth with the ratchet surface and the pressure edge with the arcuate surface forms a pawl-ratchet self-locking mechanism, and operation of the lever portion releases the self-locking mechanism; an elastic member; the first arm and the second arm are rotatably connected at their respective pivot portions to form a first pivot and a fulcrum, a pair of jaw portions are used to grip a workpiece with a variable gap, and a clamping force is applied by a pair of handles, the ratchet arc is fixed to the handle portion of the first arm by the anchor end, and the ratchet portion faces the second arm; the constant radius of the ratchet surface is centered on the axis of the first pivot, and the ratchet arc is rotatable about the axis of the first pivot along a path that follows this curvature; the integrated pawl trigger is pivotally connected to the second arm via a pivot portion thereof to form a second pivot, the second pivot being a variable pivot and movable within a limited range along the longitudinal direction of the second arm; the ratchet arc is slidably received within the passage of the integral pawl trigger and the passage of the second arm while undergoing an arcuate movement; the elastic member is supported between the integrated pawl trigger and the second arm, and the elastic force of the elastic member urges the integrated pawl trigger to rotate about the second pivot in a direction away from the second arm, whereby the pressure edge engages the arcuate surface and at least one of the pawl pawl teeth fully engages the ratchet surface, forming a directional pawl-ratchet self-locking mechanism between the pair of handles; therefore, the ratchet arc can slide only when the handle pair rotates toward each other, overcoming the elastic force, and at this time the pressure edge and pawl tooth disengage from the arcuate surface and the ratchet surface, respectively; and in the absence of a reaction force countering the elastic force, the ratchet arc fully engages the integrated pawl trigger, preventing the handle pair from separating; When no geometric elastic deformation occurs in the first arm and the second arm due to the clamping force applied to the handle pair, the ratchet arc moves in an arc around the first pivot within the passage of the integrated pawl trigger and the second arm, the center of the constant radius of the ratchet surface coincides with the first pivot axis, and when the ratchet arc fully engages the integrated pawl trigger, the second pivot is located at a position within a limited range; When a clamping force applied to the handle pair causes geometric elastic deformation of the first arm and the second arm, the ratchet arc moves in an arc around the first pivot within the passage of the integrated pawl trigger and the second arm, the center of the constant radius of the ratchet surface is displaced from the first pivot axis, and when the ratchet arc fully engages the integrated pawl trigger, the second pivot self-adapts to the change and settles in another position within a limited range; the variable pivot and the pawl-ratchet self-locking mechanism cooperate to form a self-adapting self-locking mechanism even when the first arm and the second arm are deformed by a clamping force; Furthermore, when a reaction force is applied to the lever portion of the integrated pawl trigger to overcome the elastic force, the integrated pawl trigger rotates about the second pivot and approaches the second arm, resulting in the pressure contact edge and the pawl pawl tooth being released from the arcuate surface and the ratchet surface, respectively, allowing the pair of handle portions to separate.

1. A self-adapting, self-locking clamping device characterized in that:

2. 2. A self-adapting, self-locking clamping device according to claim 1, the first arm has a grip portion at one end, a pivot portion in the middle, and a handle portion at the other end; the second arm has a grip portion at one end, a pivot portion in the middle, and a handle portion at the other end; Both arms are connected at their respective pivot points, forming a scissor link mechanism with the center as the fulcrum. A self-adaptive, self-locking clamping device characterized by a configuration in which a gripping portion at one end grips a workpiece and a handle portion at the other end applies a clamping force.

3. 2. A self-adapting, self-locking clamping device according to claim 1, the first arm has a pivot portion at one end, a grip portion at the center, and a handle portion at the other end; the second arm has a pivot portion at one end, a grip portion at the center, and a handle portion at the other end; Both arms are pivotally connected at their respective pivot points, with the first pivot acting as a fulcrum. A self-adaptive, self-locking clamping device characterized by a configuration in which a workpiece is gripped by a central gripping portion and gripping force is applied by a handle portion at the other end.

4. 1. A self-adapting, self-locking clamping device comprising: a first arm having a longitudinally curved body and including a jaw portion, a pivot portion, and a handle portion; a second arm having a longitudinally curved body, the second arm including a jaw portion, a pivot portion, and a handle portion, the handle portion further including a transverse slot-like notch defining a passageway between opposite sides thereof; a ratchet arc having a longitudinal body and including an anchor end and an arcuate ratchet portion, said ratchet portion further including an integrally formed arcuate side ratchet surface having a constant radius on one side and an arcuate surface on the other side, said arcuate surface being generally concentric with said ratchet surface; a pawl having a longitudinal body, the pawl including a pawl head and a rotation limiting portion, the pawl head further including an integrally formed lateral pawl surface for engaging the ratchet surface, and pivot means disposed on the integrally formed pawl surface about which the pawl rotates, the rotation limiting portion limiting the range of rotation of the pawl; a linkage trigger having a longitudinal body and including a laterally projecting pivot portion and a lever portion, wherein said lever portion further includes a transverse slot-like notch cut adjacent said hinge portion, said notch forming a passage for slidably receiving a ratchet arc and for pivotally receiving a pawl, and wherein said pivot portion further includes first and second pivot means; An elastic member; Equipped with the first arm is rotatably connected to the second arm at its pivot portion, forming a first pivot and a fulcrum, and forming a pair of jaws having at least a variable gap for clamping a workpiece, and a pair of handles for applying a clamping force; the ratchet arc is fixedly engaged with a handle portion of the first arm at the anchor end, and is positioned such that the ratchet portion faces the second arm; the constant radius of the ratchet surface is centered about the axis of the first pivot, and the ratchet arc is pivotable about the axis of the first pivot in a path that coincides with the curve of the ratchet surface; the linkage trigger is pivotally connected to the second arm via the first pivot means to form the second pivot and faces the first arm; the pawl is pivotally connected to the linkage trigger via the pivot means of the pawl and the second pivot means of the linkage trigger to form a third pivot, the third pivot being a variable pivot that is rotatable around the second pivot, and the pawl is rotatable around the third pivot within a range limited by the rotation limiter; the ratchet arc is slidably received in the passage of the linkage trigger and the passage of the second arm and is capable of arcuate movement about the axis of the first pivot; the elastic member is supported between the linkage trigger and the second arm and applies an elastic force to rotate the linkage trigger about the second pivot in a direction away from the second arm, whereby the pawl is blocked by the ratchet arc and fully engaged, forming a unidirectional pawl-ratchet self-locking mechanism between the pair of handles; therefore, the ratchet arc is slidable only when the pair of handles are rotated toward each other against the elastic force, and when there is no counter force against the elastic force, the ratchet arc is fully engaged with the pawl and prevents the pair of handles from moving apart; When the clamping force applied to the pair of handles does not cause geometric elastic deformation of the first arm and the second arm, the ratchet arc moves in an arc about the first pivot within the passage of the linkage trigger and the second arm, and when the center of the constant radius of the ratchet surface coincides with the axis of the first pivot and the ratchet arc is fully engaged with the pawl, the third pivot is settled in a certain position, and the pawl is also rotated within its limited range and settled in a certain position, On the other hand, when the clamping force applied to the pair of handles causes geometric elastic deformation of the first arm and the second arm, the ratchet arc moves in an arc about the first pivot within the passage of the linkage trigger and the second arm, and when the center of the constant radius of the ratchet surface deviates from the axis of the first pivot and the ratchet arc fully engages with the pawl, the third pivot self-adapts to the change and settles in another position, and the pawl also rotates within its limited range and settles in another position; a variable pivot between the pawl and the linkage trigger cooperates with a unidirectional pawl-ratchet self-locking mechanism between the pawl and the ratchet arc to form a self-adapting self-locking mechanism when the first and second arms are deformed by a clamping force; Furthermore, when a reaction force opposing the elastic force is applied to the lever portion of the linkage trigger, the linkage trigger rotates around the second pivot and approaches the second arm, the pawl disengages from the ratchet arc, and the pair of handles can be separated.

1. A self-adapting, self-locking clamping device characterized in that:

5. 5. A self-adapting, self-locking clamping device according to claim 4, the first arm has a body having a jaw portion at one end, a pivot portion at the center therebehind, and a handle portion at the other end; the second arm has a body having a jaw portion at one end, a pivot portion at the center therebehind, and a handle portion at the other end; the first arm is pivotally connected to the second arm at each pivot portion, forming a first pivot and a fulcrum at a center thereof; A self-adapting, self-locking clamping device characterized in that a pair of jaws at one end grips a load and a pair of handles at the other end form a scissor linkage mechanism for applying an actuating force.

6. 5. A self-adapting, self-locking clamping device according to claim 4, the first arm has a body having a pivot portion at one end, a jaw portion at the center behind the body, and a handle portion at the other end; the second arm has a body having a pivot portion at one end, a jaw portion at the center behind the body, and a handle portion at the other end; the first arm is pivotally connected to the second arm at each of the pivot portions, and defines the first pivot and the fulcrum at one end; A self-adapting, self-locking clamping device characterized by having a configuration in which a central pair of jaws grips a load and an actuating force is applied by a pair of handles at the other end.

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