A multifunctional wrench used in narrow space

Abstract

The present application relates to the technical field of wrenches, and discloses a multifunctional wrench used in narrow space, which comprises a wrench head installed at the end of a handheld part, a sleeve joint device arranged in the wrench head, the sleeve joint device comprising a sleeve joint part and a ratchet wheel, and a pawl set arranged in the wrench head, the pawl set being composed of multiple overlapping pawl parts and rotating parts, each pawl part comprising a pawl plate and an elastic device, and the pawl plate being provided with a pawl rotating shaft hole at one end away from the ratchet wheel; the rotating part comprising a rotating shaft and multiple eccentric wheels, each eccentric wheel being clamped in the corresponding pawl rotating shaft hole in each layer of pawl plates, the difference between the distance from the distal end of the eccentric wheel to the rotation center and the distance from the proximal end of the eccentric wheel to the rotation center being a moving value, and the moving values of different eccentric wheels in one rotating part being different. The multifunctional wrench used in narrow space has the advantages of increasing the effective rotation angle in narrow space, having the functions of turning and switching between normal mode and narrow mode.

Description

Technical Field

[0001] This invention relates to the field of wrench technology, specifically a multi-functional wrench for use in confined spaces. Background Technology

[0002] A wrench is a common tool for installation and removal. It is a hand tool that uses leverage to tighten or loosen bolts, screws, nuts, and other threaded fasteners by using an opening or socket to hold the bolt or nut. Wrenches are usually made of carbon or alloy structural steel. They typically have an opening or socket at one or both ends of the handle to hold the bolt or nut. When using a wrench, external force is applied to the handle in the direction of thread rotation to tighten or loosen the bolt or nut.

[0003] A ratchet wrench is a type of wrench that applies torque only when turned in one direction and idles when turned in the other. This type of wrench simplifies the turning process, improves work efficiency, and is also convenient for use in confined spaces. Ratchet wrenches typically have a socket device inside the wrench head. The socket device includes a socket part, which can be an outwardly protruding snap or an inwardly hollow retaining ring. When the socket part is snapped, it can fit onto sockets of different sizes, allowing bolts of different sizes to be turned using the sockets. A ratchet is also located on the outside of the socket part, and a pawl is located inside the wrench head to limit the direction of ratchet rotation, thus achieving unidirectional rotation. Since the socket-type socket part needs to accommodate rotation in both directions, two symmetrical pawls are also located inside the wrench head to switch the idle direction.

[0004] When using a ratchet wrench in a confined space, the gaps between the ratchet teeth mean that the pawl needs to rotate a certain angle after locking one tooth before it can lock the next. This results in the wrench being allowed to rotate an angle greater than the actual effective rotation angle in a narrow space. Increasing the number of teeth on the ratchet can increase the effective rotation angle ratio, but too many teeth will reduce the contact area between the pawl and the ratchet teeth, making it easy for the teeth to slip and reducing the service life.

[0005] Patent application CN201310727301.X discloses a wrench with a hollow head connected to a grip. A gear and multiple engaging components are installed inside the head, which can be concealed by a cover enclosing the top of the head. This wrench also has a toggle switch that determines whether the engaging components operate in a normal or confined space mode. When the toggle switch is moved to the normal space mode, only a single engaging component maintains normal engagement with the gear, allowing the wrench to swing at a standard free-swing angle.

[0006] In the "narrow space" mode, the two corner posts are no longer restricted by the drive structure and can take turns meshing with the corresponding teeth of the gear, allowing the wrench to swing with a small free-spinning angle. However, the above method is only applicable to snap ring type ratchet wrenches. Sleeve type ratchet wrenches need to have a steering function, which this structure cannot achieve.

[0007] In summary, existing wrenches still have the following drawbacks: 1. When used in narrow spaces, the actual effective rotation angle of the wrench is less than the allowable rotation angle, resulting in low efficiency; 2. Socket ratchet wrenches need to have both steering and narrow space switching functions. Summary of the Invention

[0008] (a) Technical problems to be solved

[0009] To address the shortcomings of existing technologies, this invention provides a multi-functional wrench for use in confined spaces. It has the advantages of increasing the effective rotation angle in confined spaces, having a steering function, and being able to switch between normal and confined modes, thus solving the problem of low rotation efficiency in confined spaces.

[0010] (II) Technical Solution

[0011] To achieve the above objectives, the present invention provides the following technical solution:

[0012] A multi-functional wrench for use in confined spaces includes a wrench head mounted on the end of a handle. The wrench head contains a connecting device, which includes a connecting portion and a ratchet. The ratchet has circumferentially distributed ratchet teeth on its outer side. The wrench head also contains a pawl assembly, which consists of multiple overlapping pawl portions and a rotating portion passing through the multiple pawl portions. Each pawl portion includes a pawl plate and a spring mechanism. The pawl plate has a pawl pivot hole at the end away from the ratchet.

[0013] The rotating part includes a rotating shaft and multiple eccentric wheels that rotate on the rotating shaft. Each eccentric wheel is locked in the corresponding pawl shaft hole in each pawl plate. Each eccentric wheel rotates eccentrically around the rotating shaft. The difference between the distance from the far end of the eccentric wheel to the center of rotation and the distance from the near end of the eccentric wheel to the center of rotation is the displacement value. The displacement values ​​of different eccentric wheels in a rotating part are different.

[0014] Preferably, there are two pawl assemblies in a wrench head, and the two pawl assemblies are symmetrical to each other. An eccentric top block is also provided between the two pawl assemblies in the wrench head. The eccentric top block rotates eccentrically. When the eccentric top block rotates clockwise and counterclockwise, the far end of the eccentric top block presses against the two symmetrical pawl assemblies respectively, and the pawl assembly pressed by the eccentric top block disengages from the ratchet.

[0015] Preferably, the eccentric top block is connected to a dial, which is located on the outside of the wrench head. The dial is used to rotate the eccentric top block, thereby switching the free rotation direction of the socket device.

[0016] Preferably, the rotating parts on both pawl assemblies are connected to end gears, and the two end gears mesh with a central gear. The rotation of the central gear drives the two end gears to rotate simultaneously, thereby driving the rotating parts in the two pawl assemblies to rotate. The central gear is connected to a knob, which is located on the outside of the wrench head.

[0017] Preferably, the rotating part rotates by a fixed angle each time, and the rotating part drives the central gear to rotate, thereby driving the end gear to rotate. The rotating part rotates by a fixed angle each time, driving the end gear to rotate by a fixed angle. The end gear rotates 180 degrees each time, thereby causing the eccentric wheel to rotate near and far ends to switch between normal mode and narrow mode.

[0018] Preferably, the wrench head is further provided with a scale, which is located on the side of the knob and is used to limit the rotation angle of the knob.

[0019] Preferably, the contact point between the eccentric wheel and the pawl shaft hole is always on the side closer to the ratchet wheel under the action of the elastic device. The distance between the end of the pawl near the ratchet wheel and the rotation center of the rotating part is the length value. In the narrow mode, the proximal end of the eccentric wheel is attached to the pawl shaft hole, and in the normal mode, the distal end of the eccentric wheel is attached to the pawl shaft hole. In the narrow mode, the difference in length values ​​of each pawl plate is greater than the difference in length values ​​of each pawl plate in the normal mode.

[0020] Preferably, one end of each elastic device is fixed to the corresponding ratchet portion, and the other end is fixed to the inside of the wrench head.

[0021] Preferably, the sleeve portion is an outwardly protruding protrusion, and the sleeve portion is also provided with a buckle. The sleeve portion is used to fix sleeves of different specifications.

[0022] Preferably, the wrench head is fixed to the connecting rod, the connecting rod is connected to the handheld part, and the handheld part is also provided with a controller. The controller is used to control the torque on the connecting rod and to issue a warning when the torque on the connecting rod exceeds a preset value.

[0023] (III) Beneficial Effects

[0024] Compared with the prior art, the present invention provides a multi-functional wrench for use in confined spaces, which has the following advantages:

[0025] 1. This multi-functional wrench for use in confined spaces consists of multiple overlapping pawls and a rotating part that runs through them. Rotating the rotating part causes the eccentric wheel to rotate eccentrically, thereby changing the position of each pawl end. In normal mode, the ends of each pawl overlap, and each pawl abuts against the same ratchet tooth on the ratchet wheel. In confined space mode, the ends of each pawl are spaced apart, and only one pawl engages with the ratchet tooth at a time. The other pawls are close to other ratchet teeth, and only an angle smaller than the ratchet tooth spacing is needed to engage another ratchet tooth. This reduces the free-spinning angle per segment, increases the ratio of effective rotation angle to allowable rotation angle in confined spaces, improves work efficiency, and avoids reducing service life by not changing the ratchet tooth spacing.

[0026] 2. This multi-functional wrench for use in narrow spaces features two symmetrical pawl sets with an eccentric rotating eccentric block between them. By rotating the eccentric block, the pawl set engaging with the ratchet can be switched, thereby adjusting the direction of rotation and achieving steering function.

[0027] 3. This multi-functional wrench for use in narrow spaces uses an eccentric wheel. When the eccentric wheel rotates, it switches the contact between the proximal and distal ends of the pawl shaft hole. Because the difference between the proximal and distal ends of each eccentric wheel is different, the displacement of each pawl plate is different, resulting in a different spacing between the ends of each pawl plate, thus achieving the purpose of switching between narrow and normal modes. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the multi-functional wrench of the present invention for use in confined spaces.

[0029] Figure 2 This is a partial structural diagram of the wrench head of the present invention.

[0030] Figure 3 This is a schematic diagram of the internal structure of the wrench head of the present invention in a narrow mode.

[0031] Figure 4 This is a cross-sectional view of the wrench head of the present invention in a narrow mode.

[0032] Figure 5 This is a cross-sectional view of the wrench head of the present invention in normal mode.

[0033] Figure 6 This is a schematic diagram of the structure of a ratchet assembly according to the present invention.

[0034] Figure 7 This is a schematic diagram of the rotating part in a ratchet assembly according to the present invention.

[0035] Figure 8This is a front view of the wrench head of the present invention after removing the knob and dial.

[0036] Figure 9 This is a front view of the wrench head of the present invention.

[0037] In the diagram: 11. Wrench head; 12. Handheld part; 13. Controller; 14. Connecting rod; 111. Toggle slot;

[0038] 2. Socketing device; 21. Socketing part; 22. Ratchet;

[0039] 3. Pawl assembly; 31. Pawl part; 311. Pawl plate; 312. Pawl pivot hole; 313. Elastic device; 32. Rotating part; 321. Pivot; 322. Eccentric wheel; 33. End gear; 30. Center gear; 301. Knob; 302. Dial;

[0040] 4. Eccentric top block; 41. Toggle switch. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Example 1:

[0043] This embodiment provides a multi-functional wrench for use in confined spaces, which has the following technical features.

[0044] Please see Figure 1-9 A multi-functional wrench for use in confined spaces includes a wrench head 11 mounted on the end of a handle 12. A connecting device 2 is provided inside the wrench head 11. The connecting device 2 includes a connecting part 21 and a ratchet 22. The ratchet 22 has circumferentially distributed ratchet teeth on its outer side. A pawl assembly 3 is also provided inside the wrench head 11. The pawl assembly 3 consists of multiple overlapping pawl parts 31 and a rotating part 32 passing through the multiple pawl parts 31. Each pawl part 31 includes a pawl plate 311 and an elastic device 313. The pawl plate 311 has a pawl pivot hole 312 at the end away from the ratchet 22.

[0045] The rotating part 32 includes a rotating shaft 321 and a plurality of eccentric wheels 322 that are engaged on the rotating shaft 321. Each eccentric wheel 322 is engaged in a corresponding pawl shaft hole 312 in each pawl plate 311. Each eccentric wheel 322 rotates eccentrically around the rotating shaft 321. The difference between the distance from the far end of the eccentric wheel 322 to the center of rotation and the distance from the near end of the eccentric wheel 322 to the center of rotation is the displacement value. The displacement values ​​of different eccentric wheels 322 in a rotating part 32 are different.

[0046] It should be noted that the socket device 2 can be an outwardly protruding locking block or a hollow retaining ring. When the socket device 2 is a locking block, it is used to connect the sleeve. Different sizes of sleeves can fit different sizes of nuts. When the socket device 2 is a retaining ring, it is used to directly lock the nuts of a fixed size.

[0047] Through the above technical solution, the pawl assembly 3 consists of multiple overlapping pawl portions 31 and a rotating part 32 that passes through multiple pawl portions 31. Rotating the rotating part 32 causes the eccentric wheel 322 to rotate eccentrically, thereby changing the position of the ends of each pawl plate 311. In normal mode, the ends of each pawl plate 311 overlap, and each pawl plate 311 abuts against the same ratchet tooth on the ratchet wheel 22. In narrow mode, the ends of each pawl plate 311 have a certain distance. Only one pawl plate 311 engages with the ratchet tooth of the ratchet wheel 22 at a time, while the other pawl plates 311 are close to other ratchet teeth. Only an angle smaller than the ratchet tooth distance is needed to make another ratchet tooth engage with the pawl plate 311, thereby reducing the angle of each idle rotation, increasing the ratio of the effective rotation angle to the allowable rotation angle in narrow spaces, improving work efficiency, and avoiding the need to change the ratchet tooth distance, thus avoiding a reduction in service life.

[0048] In an optional embodiment, there are two pawl groups 3 in a wrench head 11, and the two pawl groups 3 are symmetrical to each other. An eccentric top block 4 is also provided between the two pawl groups 3 in the wrench head 11. The eccentric top block 4 rotates eccentrically. When the eccentric top block 4 rotates clockwise and counterclockwise, the far end of the eccentric top block 4 presses against the two symmetrical pawl groups 3 respectively, and the pawl group 3 pressed by the eccentric top block 4 disengages from the ratchet 22.

[0049] Through the above technical solution, by setting two symmetrical pawl groups 3, and setting an eccentric rotating eccentric top block 4 between the pawl groups 3, the pawl group 3 that meshes with the ratchet 22 can be switched by rotating the eccentric top block 4, thereby adjusting the direction of rotation and realizing the steering function.

[0050] In an optional embodiment, the eccentric top block 4 is connected to a dial 41, which is located on the outside of the wrench head 11. The dial 41 is used to rotate the eccentric top block 4, thereby switching the free-spinning direction of the socket device 2.

[0051] It should be noted that the wrench head 11 is also provided with an inwardly recessed knob groove 111 at the position corresponding to the knob 41, so that the knob 41 can rotate hidden in the knob groove 111.

[0052] In an optional embodiment, the rotating parts 32 on both pawl assemblies 3 are connected to end gears 33, and the two end gears 33 mesh with a central gear 30. The rotation of the central gear 30 drives the two end gears 33 to rotate simultaneously, thereby driving the rotating parts 32 in the two pawl assemblies 3 to rotate. The central gear 30 is connected to a knob 301, which is located on the outside of the wrench head 11.

[0053] It should be noted that the end gear 33 and the center gear 30 are both located inside the wrench head 11, and the knob 301 is located outside the wrench head 11. The top of the knob 301 is provided with a rotating shaft that is fixed inside the wrench head 11 for rotation.

[0054] In an optional embodiment, the rotating part 32 rotates by a fixed angle each time, and the rotating part 32 drives the central gear 30 to rotate, thereby driving the end gear 33 to rotate. The rotating part 32 rotates by a fixed angle each time, driving the end gear 33 to rotate by a fixed angle each time. The end gear 33 rotates 180 degrees each time, thereby causing the eccentric wheel 322 to rotate near and far to switch between normal mode and narrow mode.

[0055] Specifically, the number of teeth of both end gears 33 is 'a', the number of teeth of the center gear 30 is 'b', and the rotation angle of the rotating part 32 is limited to 180*a / b degrees each time. The rotation of the rotating part 32 by 180*a / b degrees causes the end gears 33 to rotate by 180 degrees, thereby causing the eccentric wheel 322 to switch between the far end and the near end, thus switching between the normal mode and the narrow mode.

[0056] It should be noted that, for example, if the two end gears 33 have 18 teeth and the center gear 30 has 27 teeth, then the knob 301 rotates at the same angle as the center gear 30. Therefore, the knob 301 rotates by a fixed angle of 120 degrees each time. The knob 301 rotates 120 degrees, causing the center gear 30 to rotate 120 degrees. The center gear 30 rotates 120 degrees, causing the end gears 33 to rotate 180 degrees. The end gears 33 rotate 180 degrees, causing the eccentric wheel 322 to rotate 180 degrees. The eccentric wheel 322 rotates 180 degrees, which switches the contact between the proximal / far end of the pawl shaft hole 312 and the far end / proximal end of the pawl shaft hole 312. This changes the distance between the ends of each pawl plate 311. When the distance is large, it is in narrow mode; when the distance is small or 0, it is in normal mode.

[0057] In an optional embodiment, the wrench head 11 is further provided with a dial 302, which is located on the side of the knob 301 and is used to limit the angle of rotation of the knob 301.

[0058] It should be noted that the dial 302 is located on top of the end gear 33 and is used to cover the end gear 33.

[0059] In an optional embodiment, the contact point between the eccentric wheel 322 and the pawl shaft hole 312 is always on the side closer to the ratchet 22 under the action of the elastic device 313. The distance between the end of the pawl portion 31 near the ratchet 22 and the rotation center of the rotating portion 32 is the length value. In the narrow mode, the proximal end of the eccentric wheel 322 is attached to the pawl shaft hole 312, and in the normal mode, the distal end of the eccentric wheel 322 is attached to the pawl shaft hole 312. In the narrow mode, the difference in length values ​​of each pawl plate 311 is greater than the difference in length values ​​of each pawl plate 311 in the normal mode.

[0060] Specifically, in narrow mode, such as Figure 4 As shown, the difference in length values ​​at the ends of each pawl plate 311 is large, which means the end spacing is large. Only one pawl plate 311 engages with the ratchet tooth of the ratchet 22 at a time. The other pawl plates 311 are close to other ratchet teeth. It is only necessary to rotate the pawl plate 311 by an angle smaller than the ratchet tooth spacing to engage another ratchet tooth with the pawl plate 311. In normal mode, the difference in length values ​​at the ends of each pawl plate 311 is small, which means the end spacing is small. Each pawl plate 311 rests on the same ratchet tooth on the ratchet 22.

[0061] It should be noted that the term "end of the pawl plate 311" specifically refers to the end of each pawl plate 311 that is closest to the ratchet 22.

[0062] In an optional embodiment, one end of each elastic device 313 is fixed to the corresponding pawl portion 31, and the other end is fixed to the inside of the wrench head 11.

[0063] In an optional embodiment, the socket 21 is an outwardly protruding protrusion, and the socket 21 is also provided with a buckle. The socket 21 is used to fix sleeves of different specifications.

[0064] In an optional embodiment, the wrench head 11 is fixed to the connecting rod 14, the connecting rod 14 is connected to the hand handle 12, and the hand handle 12 is also provided with a controller 13, which is used to control the torque on the connecting rod 14 and issue a reminder when the torque on the connecting rod 14 exceeds a preset value.

[0065] Example 2:

[0066] This embodiment provides a multi-functional wrench for use in confined spaces, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0067] A multi-functional wrench for use in confined spaces includes a wrench head 11 mounted on the end of a handle portion 12. A connecting device 2 is disposed within the wrench head 11. The connecting device 2 includes a connecting portion 21 and a ratchet 22. The ratchet 22 has circumferentially distributed ratchet teeth on its outer side. A pawl assembly 3 is also disposed inside the wrench head 11. The pawl assembly 3 consists of multiple overlapping pawl portions 31 and a rotating portion 32 passing through the multiple pawl portions 31. Each pawl portion 31 includes a pawl plate 311 and an elastic device 313. 1. A pawl pivot hole 312 is provided at the end away from the ratchet 22; the rotating part 32 includes a pivot 321 and a plurality of eccentric wheels 322 that are engaged on the pivot 321 and rotate. Each eccentric wheel 322 is engaged in the corresponding pawl pivot hole 312 in each layer of pawl plate 311. Each eccentric wheel 322 rotates eccentrically around the pivot 321. The difference between the distance from the far end of the eccentric wheel 322 to the rotation center and the distance from the near end of the eccentric wheel 322 to the rotation center is the displacement value. The displacement values ​​of different eccentric wheels 322 in a rotating part 32 are different.

[0068] The above technical solution is applicable to wrenches that do not require a steering function.

[0069] Working principle: The principle of narrow mode: In normal mode, such as Figure 5 As shown, the ends of each ratchet plate 311 overlap, and each ratchet plate 311 abuts against the same ratchet tooth on the ratchet wheel 22; in the narrow mode, as Figure 4 As shown, each pawl plate 311 has a certain distance between its ends. Only one pawl plate 311 engages with the ratchet teeth of the ratchet wheel 22 at a time. The other pawl plates 311 are close to other ratchet teeth. Only an angle smaller than the ratchet tooth distance is needed to make another ratchet tooth engage with the pawl plate 311, thereby reducing the angle of each segment of free rotation. The method for switching between normal and narrow modes is as follows: rotate the knob 301 to rotate the central gear 30, which drives the end gear 33 to rotate. The end gear 33 drives the rotating shaft 321 to rotate. The rotating shaft 321 and multiple eccentric wheels 322 rotate through a key engagement. When the eccentric wheels 322 rotate, they switch the near and far ends to contact the pawl shaft hole 312. Since the difference between the near and far ends of each eccentric wheel 322 is different, the displacement of each pawl plate 311 is different, which makes the distance between the ends of each pawl plate 311 different, thus achieving the purpose of switching between narrow and normal modes. Method for switching steering: Rotate the knob 41 to rotate the eccentric top block 4. The far end of the eccentric top block 4 rests on one of the pawl groups 3. At this time, the other pawl group 3 engages with the ratchet 22. Since the two pawl groups 3 are symmetrical to each other and engage in the opposite direction to the ratchet 22, the steering function is achieved.

[0070] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0071] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-functional wrench for use in confined spaces, comprising a wrench head (11) mounted on the end of a handle (12), wherein a connecting device (2) is provided inside the wrench head (11), the connecting device (2) comprising a connecting part (21) and a ratchet (22), wherein circumferentially distributed ratchet teeth are provided on the outer side of the ratchet (22), and a pawl assembly (3) is also provided inside the wrench head (11), characterized in that: The pawl assembly (3) consists of multiple overlapping pawl portions (31) and a rotating portion (32) passing through the multiple pawl portions (31). Each pawl portion (31) includes a pawl plate (311) and an elastic device (313). The pawl plate (311) has a pawl pivot hole (312) at one end away from the ratchet (22). The rotating part (32) includes a rotating shaft (321) and a plurality of eccentric wheels (322) that rotate on the rotating shaft (321). Each eccentric wheel (322) is locked in the corresponding pawl shaft hole (312) in each pawl plate (311). Each eccentric wheel (322) rotates eccentrically around the rotating shaft (321). The difference between the distance from the far end to the rotation center and the distance from the near end to the rotation center on the eccentric wheel (322) is the displacement value. The displacement values ​​of different eccentric wheels (322) in a rotating part (32) are different. There are two pawl groups (3) in a wrench head (11), and the two pawl groups (3) are symmetrical to each other. An eccentric top block (4) is also provided between the two pawl groups (3) in the wrench head (11). The eccentric top block (4) rotates eccentrically. When the eccentric top block (4) rotates clockwise and counterclockwise, the far end of the eccentric top block (4) presses against the two symmetrical pawl groups (3) respectively. The pawl group (3) pressed by the eccentric top block (4) disengages from the ratchet (22). The rotating parts (32) on both pawl assemblies (3) are connected to end gears (33), and the two end gears (33) mesh with a central gear (30). The rotation of the central gear (30) drives the two end gears (33) to rotate simultaneously, thereby driving the rotating parts (32) in the two pawl assemblies (3) to rotate. The central gear (30) is connected to a knob (301), and the knob (301) is located on the outside of the wrench head (11). The rotating part (32) rotates by a fixed angle each time, and the rotating part (32) drives the central gear (30) to drive the end gear (33) to rotate. The rotating part (32) rotates by a fixed angle each time, and the end gear (33) rotates by a fixed angle each time. The end gear (33) rotates 180 degrees each time, so that the eccentric wheel (322) rotates to switch between normal mode and narrow mode near and far end.

2. A multi-functional wrench for use in confined spaces according to claim 1, characterized in that, The eccentric top block (4) is connected to a dial (41), which is located on the outside of the wrench head (11). The dial (41) is used to rotate the eccentric top block (4) to switch the free rotation direction of the sleeve device (2).

3. A multi-functional wrench for use in confined spaces according to claim 1, characterized in that, The wrench head (11) is also provided with a dial (302), which is located on the side of the knob (301) and is used to limit the angle of rotation of the knob (301).

4. A multi-functional wrench for use in confined spaces according to claim 1, characterized in that, The contact point between the eccentric wheel (322) and the pawl shaft hole (312) is always on the side closer to the ratchet (22) under the action of the elastic device (313). The distance between the end of the pawl part (31) close to the ratchet (22) and the rotation center of the rotating part (32) is the length value. In the narrow mode, the proximal end of the eccentric wheel (322) is attached to the pawl shaft hole (312). In the normal mode, the distal end of the eccentric wheel (322) is attached to the pawl shaft hole (312). In the narrow mode, the difference in length values ​​of each pawl plate (311) is greater than the difference in length values ​​of each pawl plate (311) in the normal mode.

5. A multi-functional wrench for use in confined spaces according to claim 1, characterized in that, One end of each elastic device (313) is fixed to the corresponding pawl (31), and the other end is fixed to the inside of the wrench head (11).

6. A multi-functional wrench for use in confined spaces according to claim 1, characterized in that, The socket (21) is an outwardly protruding protrusion, and the socket (21) is also provided with a buckle. The socket (21) is used to fix sleeves of different specifications.

7. A multi-functional wrench for use in confined spaces according to claim 1, characterized in that, The wrench head (11) is fixed on the connecting rod (14), the connecting rod (14) is connected to the hand-held part (12), and the hand-held part (12) is also provided with a controller (13). The controller (13) is used to control the torque on the connecting rod (14) and to issue a reminder when the torque on the connecting rod (14) exceeds a preset value.

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