CN118238089A - Multifunctional wrench used in narrow space - Google Patents

Abstract

The invention relates to the technical field of wrenches, and discloses a multifunctional wrench used in a narrow space, which comprises a wrench head arranged at the end part of a hand-held part, wherein a sleeving device is arranged in the wrench head, the sleeving device comprises a sleeving part and a ratchet wheel, a pawl group is further arranged in the wrench head, the pawl group consists of a plurality of overlapped pawl parts and a rotating part, each pawl part comprises a pawl plate and an elastic device, and a pawl rotating shaft hole is formed in one end of the pawl plate far away from the ratchet wheel; the rotating part comprises a rotating shaft and a plurality of eccentric wheels, each eccentric wheel is clamped in a corresponding pawl rotating shaft hole in each layer of pawl plate, the difference between the distance from the far end to the rotating center and the distance from the near end to the rotating center on the eccentric wheel is a moving value, and the moving values of different eccentric wheels in one rotating part are different. The multifunctional wrench used in the narrow space has the advantages of improving the effective rotation angle in the narrow space, having the steering function and switching the normal/narrow mode function.

Description

Multifunctional wrench used in narrow space

Technical Field

The invention relates to the technical field of wrenches, in particular to a multifunctional wrench used in a narrow space.

Background

Wrenches are a common type of installation and removal tool that uses the principle of leverage to turn bolts, screws, nuts and other threads to tighten the openings or trepanning fasteners of the bolts or nuts. The wrench is usually made of carbon or alloy structural steel, and is usually provided with an opening or a trepanning for clamping a bolt or a nut at one or both ends of the shank, and when in use, an external force is applied to the shank in the direction of rotation of the threads, so that the bolt or the nut can be screwed.

The ratchet wrench is a wrench capable of only applying torque when rotating in one direction and idling when rotating in the other direction, the wrench can simplify the rotating step, improves the working efficiency, is convenient to use in a narrow space, is generally provided with a sleeving device in a wrench head, the sleeving device comprises a sleeving part, the sleeving part can be an outwards convex buckle or an inwards hollow clamping ring, the sleeving part can be sleeved with sleeves of different types and sizes when being buckled, the sleeves are used for rotating bolts of different sizes, a ratchet wheel is further arranged on the outer side of the sleeving part, a pawl is further arranged in the wrench head and used for limiting the rotating direction of the ratchet wheel, so that unidirectional rotation is realized, and the sleeving part needs to adapt to rotation in two directions, so that two symmetrical pawls are further arranged in the wrench head to switch the idling direction.

When using ratchet spanner in narrow space, owing to have the clearance between the ratchet on the ratchet, the pawl needs to rotate certain angle again and just can block next ratchet after blocking a ratchet, this just leads to in the narrow region in space, spanner allow pivoted angle to be greater than actual effective rotation angle, increase the number of teeth of ratchet can improve effective rotation angle duty cycle, but the too high area that can lead to the impetus between pawl and the ratchet reduces, leads to smooth tooth easily, reduction life.

Patent application number cn201310727301.X discloses a wrench in which a hollow head is connected to a grip portion, and a gear and a plurality of engagement members are mounted in the head and are shielded by a cover member closing the top of the head. The wrench also has a toggle button, through which the engagement assembly is determined to execute the normal space mode or the narrow space mode. When the toggle button is moved to the normal space mode, only the single engagement assembly maintains a normal engagement relationship with the gear, so that the wrench swings at a standard idle angle.

In the narrow space mode, the two corner posts are not limited by the driving structure, and can be meshed with corresponding teeth of the gears in turn, so that the wrench swings at a smaller idle angle, but the method is only applicable to a clamping ring type ratchet wrench, the sleeve type ratchet wrench needs a steering function, and the steering function cannot be realized by the structure.

In summary, the existing wrench has the following drawbacks: 1. when the wrench is used in a narrow space, the actual effective rotation angle of the wrench is smaller than the allowable rotation angle of the wrench, and the use efficiency is low; 2. the socket ratchet wrench needs to have both functions of steering and switching the narrow mode.

Disclosure of Invention

(One) solving the technical problems

Aiming at the defects of the prior art, the invention provides a multifunctional wrench used in a narrow space, which has the advantages of improving the effective rotation angle in the narrow space, having the steering function and the normal/narrow mode switching function, and solving the problem of low rotation efficiency in the narrow space.

(II) technical scheme

In order to achieve the above purpose, the present invention provides the following technical solutions:

The multifunctional wrench for use in a narrow space comprises a wrench head arranged at the end part of a hand-held part, wherein a sleeving device is arranged in the wrench head, the sleeving device comprises a sleeving part and a ratchet wheel, circumferentially distributed ratchets are arranged on the outer side of the ratchet wheel, a pawl group is further arranged in the wrench head, the pawl group consists of a plurality of pawl parts overlapped together and a rotating part penetrating through the plurality of pawl parts, each pawl part comprises a pawl plate and an elastic device, and a pawl rotating shaft hole is formed in one end of the pawl plate far away from the ratchet wheel;

The rotating part comprises a rotating shaft and a plurality of eccentric wheels clamped on the rotating shaft for rotation, each eccentric wheel is clamped in a corresponding pawl rotating shaft hole in each layer of pawl plate, each eccentric wheel eccentrically rotates around the rotating shaft, the difference between the distance from the far end to the rotating center and the distance from the near end to the rotating center on the eccentric wheel is a moving value, and the moving values of different eccentric wheels in one rotating part are different.

Preferably, the number of the pawl groups in one wrench head is two, the two pawl groups are symmetrical with each other, an eccentric jacking block is further arranged between the two pawl groups in the wrench head, the eccentric jacking block rotates eccentrically, the distal ends of the eccentric jacking block respectively prop against the two symmetrical pawl groups when the eccentric jacking block rotates clockwise and anticlockwise, and the pawl groups propped by the eccentric jacking block are separated from the ratchet wheel.

Preferably, the eccentric jacking block is connected with a poking button, the poking button is arranged at the outer side of the spanner head and is used for rotating the eccentric jacking block so as to switch the idling direction of the sleeving device.

Preferably, the rotating parts on the two pawl groups are connected with end gears, the two end gears are meshed with a central gear, and the central gear rotates to drive the two end gears to rotate simultaneously, so that the rotating parts in the two pawl groups are driven to rotate, the central gear is connected with a rotating button, and the rotating button is arranged outside the spanner head.

Preferably, the rotating part rotates by a fixed angle each time, the rotating part drives the central gear to drive the end gear to rotate, and the rotating part drives the end gear to rotate by a fixed angle each time, and the end gear rotates by 180 degrees each time, so that the eccentric wheel rotates to be switched between a normal mode and a narrow mode at the near-far end.

Preferably, the wrench head is further provided with a dial, the dial is arranged on the side face of the rotary knob, and the dial is used for limiting the rotation angle of the rotary knob.

Preferably, the joint of the eccentric wheel and the pawl rotating shaft hole is always at one side close to the ratchet wheel under the action of the elastic device, the distance between one end of the pawl part close to the ratchet wheel and the rotating center of the rotating part is a length value, the proximal end of the eccentric wheel is stuck to the pawl rotating shaft hole in a narrow mode, the distal end of the eccentric wheel is stuck to the pawl rotating shaft hole in a normal mode, and the difference between the length values of the pawl plates in the narrow mode is larger than the difference between the length values of the pawl plates in the normal mode.

Preferably, one end of each elastic device is fixed on the corresponding pawl part, and the other end is fixed on the inner side of the spanner head.

Preferably, the sleeving part is an outwards-protruding bump, a buckle is further arranged on the sleeving part, and the sleeving part is used for fixing sleeves of different specifications.

Preferably, the spanner head is fixed on the connecting rod, and the connecting rod is connected on handheld portion, still be provided with the controller on the handheld portion, the controller is used for controlling the moment of torsion that the connecting rod received, sends when the moment of torsion that the connecting rod received passes the default and reminds.

(III) beneficial effects

Compared with the prior art, the invention provides the multifunctional wrench used in a narrow space, which has the following beneficial effects:

1. The multifunctional wrench used in the narrow space is characterized in that the pawl group comprises a plurality of overlapped pawl parts and a rotating part penetrating through the pawl parts, the rotating part enables the eccentric wheel to eccentrically rotate, so that the positions of the end parts of all pawl plates are changed, the end parts of all pawl plates are overlapped in the normal mode, each pawl plate is propped against the same ratchet teeth on the ratchet wheel, a certain interval is reserved between the end parts of all pawl plates in the narrow mode, only one pawl plate is meshed with the ratchet teeth of the ratchet wheel each time, the other pawl plates are close to the other ratchet teeth, and the other ratchet teeth can be meshed with the pawl plates only by rotating an angle smaller than the interval of the ratchet teeth, thereby reducing the idle rotation angle of each section, improving the occupation ratio of the effective rotation angle to the allowable rotation angle in the narrow space, improving the working efficiency, avoiding the reduction of the service life without changing the interval of the ratchet teeth.

2. This multi-functional spanner that uses in narrow space sets up eccentric rotatory eccentric kicking block through setting up two symmetrical pawl groups between pawl group, can switch the pawl group with ratchet meshing through rotating eccentric kicking block to adjust pivoted direction, realize turning to the function.

3. According to the multifunctional wrench used in the narrow space, the eccentric wheels are arranged, when the eccentric wheels rotate, the near-far ends are switched to be in contact with the pawl rotating shaft holes, and the displacement of each pawl plate is different due to the fact that the difference value of the near-far ends of each eccentric wheel is different, so that the distance between the end parts of each pawl plate is different, and the purpose of switching narrow/normal modes is achieved.

Drawings

Fig. 1 is a schematic diagram of the overall structure of the multifunctional wrench used in a narrow space.

FIG. 2 is a schematic view of a part of the wrench head according to the present invention.

FIG. 3 is a schematic view showing the internal structure of the wrench head according to the present invention in a narrow mode.

FIG. 4 is a cross-sectional view of the wrench head of the present invention in a narrow mode.

Fig. 5 is a cross-sectional view of the wrench head of the present invention in a normal mode.

Fig. 6 is a schematic view of the structure of one pawl set of the present invention.

Fig. 7 is a schematic structural view of a rotating portion in one pawl group of the present invention.

FIG. 8 is a front view of the wrench head of the present invention with the knob and dial removed.

Fig. 9 is a front view of the wrench head of the present invention.

In the figure: 11. a spanner head; 12. a hand-held part; 13. a controller; 14. a connecting rod; 111. a dial Niu Cao;

2. a sleeving device; 21. a socket joint part; 22. a ratchet wheel;

3. A pawl group; 31. a pawl portion; 311. a detent plate; 312. pawl pivot hole; 313. an elastic device; 32. a rotating part; 321. a rotating shaft; 322. an eccentric wheel; 33. an end gear; 30. a sun gear; 301. a rotary knob; 302. a dial;

4. An eccentric jacking block; 41. a toggle button.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Embodiment one:

the embodiment provides a multifunctional wrench used in a narrow space, which has the following technical characteristics.

Referring to fig. 1-9, a multifunctional wrench for use in a narrow space comprises a wrench head 11 mounted at the end of a hand-holding portion 12, wherein a socket device 2 is arranged in the wrench head 11, the socket device 2 comprises a socket portion 21 and a ratchet 22, circumferentially distributed ratchets are arranged outside the ratchet 22, a pawl group 3 is further arranged in the wrench head 11, the pawl group 3 is composed of a plurality of pawl portions 31 overlapped together and a rotating portion 32 penetrating through the pawl portions 31, each pawl portion 31 comprises a pawl plate 311 and an elastic device 313, and a pawl rotating shaft hole 312 is formed in one end of the pawl plate 311 far away from the ratchet 22;

The rotating part 32 includes a rotating shaft 321 and a plurality of eccentric wheels 322 clamped on the rotating shaft 321 to rotate, each eccentric wheel 322 is clamped in a corresponding pawl rotating shaft hole 312 in each layer of pawl plate 311, each eccentric wheel 322 eccentrically rotates around the rotating shaft 321, the difference between the distance from the far end to the rotating center and the distance from the near end to the rotating center on the eccentric wheel 322 is a moving value, and the moving values of different eccentric wheels 322 in one rotating part 32 are different.

It should be noted that, the sleeving device 2 may be an outwardly protruding clamping block, or may be a hollow clamping ring, when the sleeving device 2 is a clamping block, the sleeving device 2 is used for sleeving the sleeve, and when the sleeving device 2 is a clamping ring, the sleeving device 2 is used for directly clamping nuts with fixed specifications.

Through the above technical scheme, the pawl group 3 is composed of a plurality of overlapped pawl portions 31 and a rotating portion 32 penetrating through the pawl portions 31, the rotating portion 32 enables the eccentric wheel 322 to eccentrically rotate, so that the positions of the end portions of the pawl plates 311 are changed, the end portions of the pawl plates 311 are overlapped in the normal mode, each pawl plate 311 is propped against the same ratchet teeth on the ratchet wheel 22, a certain interval is reserved between the end portions of the pawl plates 311 in the narrow mode, only one pawl plate 311 is meshed with the ratchet teeth of the ratchet wheel 22 each time, the other pawl plates 311 are close to other ratchet teeth, and only the other ratchet teeth can be meshed with the pawl plates 311 by rotating by an angle smaller than the interval of the ratchet teeth, so that the idle rotation angle of each section is reduced, the ratio of the effective rotation angle to the allowable rotation angle in the narrow space is improved, the working efficiency is improved, the interval of the ratchet teeth is not required to be changed, and the reduction of the service life is avoided.

In an alternative embodiment, the number of the pawl groups 3 in one wrench head 11 is two, the two pawl groups 3 are symmetrical to each other, an eccentric jacking block 4 is further arranged between the two pawl groups 3 in the wrench head 11, the eccentric jacking block 4 rotates eccentrically, the distal ends of the eccentric jacking block 4 respectively prop against the two symmetrical pawl groups 3 when the eccentric jacking block 4 rotates clockwise and anticlockwise, and the pawl groups 3 propped by the eccentric jacking block 4 are separated from the ratchet 22.

Through above-mentioned technical scheme, through setting up two symmetrical pawl groups 3, set up eccentric rotatory eccentric kicking block 4 between pawl group 3, can switch the pawl group 3 that meshes with ratchet 22 through rotating eccentric kicking block 4 to adjust pivoted direction, realize turning to the function.

In an alternative embodiment, the eccentric top piece 4 is connected to a knob 41, the knob 41 being arranged outside the wrench head 11, the knob 41 being used to rotate the eccentric top piece 4, thereby switching the idle direction of the socket 2.

It should be noted that, the position of the wrench head 11 corresponding to the knob 41 is further provided with an inward concave knob Niu Cao 111, so that the knob 41 is hidden in the knob groove 111 to rotate.

In an alternative embodiment, the rotating parts 32 on the two pawl groups 3 are connected with end gears 33, the two end gears 33 are meshed with a central gear 30, the central gear 30 rotates to drive the two end gears 33 to rotate simultaneously, so that the rotating parts 32 in the two pawl groups 3 are driven to rotate, the central gear 30 is connected with a rotating button 301, and the rotating button 301 is arranged outside the spanner head 11.

The end gear 33 and the sun gear 30 are both disposed inside the wrench head 11, the knob 301 is disposed outside the wrench head 11, and the top of the knob 301 is provided with a rotation shaft fixed to rotate inside the wrench head 11.

In an alternative embodiment, each time the rotating portion 32 rotates a fixed angle, the rotating portion 32 rotates the sun gear 30 and thus the end gear 33, each time the rotating portion 32 rotates the end gear 33 a fixed angle, each time the end gear 33 rotates 180 degrees, thereby causing the eccentric 322 to rotate proximally and distally switching between the normal mode and the narrow mode.

Specifically, the number of teeth of the two end gears 33 is a, the number of teeth of the sun gear 30 is b, the angle of each rotation of the rotating portion 32 is limited to 180×a/b degrees, and the rotation of the rotating portion 32 by 180×a/b degrees rotates the end gears 33 by 180 degrees, so that the eccentric gear 322 is switched between the distal end and the proximal end, and the normal mode and the narrow mode are switched.

For example, the number of teeth of the two end gears 33 is 18, the number of teeth of the sun gear 30 is 27, then the rotation angle of the rotation knob 301 is the same as that of the sun gear 30, then the rotation angle of each fixed rotation of the rotation knob 301 is 120 degrees, the rotation knob 301 rotates 120 degrees to rotate the sun gear 30 by 120 degrees, the rotation of the sun gear 30 rotates 120 degrees to drive the end gears 33 to rotate 180 degrees, the rotation of the end gears 33 rotates 180 degrees to drive the eccentric wheel 322 to rotate 180 degrees, the rotation 180 of the eccentric wheel 322 is switched from the proximal/distal contact pawl rotation shaft hole 312 to the distal/proximal contact pawl rotation shaft hole 312, so that the interval between the ends of the pawl plates 311 is changed, the interval is narrow when the interval is large, and the interval is small or the interval is normal when the interval is 0.

In an alternative embodiment, the wrench head 11 is further provided with a dial 302, the dial 302 being provided on the side of the knob 301, the dial 302 being used to limit the angle by which the knob 301 is turned.

The dial 302 is disposed on top of the end gear 33 to cover the end gear 33.

In an alternative embodiment, the fit of the eccentric 322 to the pawl pivot hole 312 is always on the side near the ratchet wheel 22 under the action of the elastic device 313, the distance between the end of the pawl portion 31 near the ratchet wheel 22 and the rotation center of the rotating portion 32 is the length value, the proximal end of the eccentric 322 is attached to the pawl pivot hole 312 in the narrow mode, the distal end of the eccentric 322 is attached to the pawl pivot hole 312 in the normal mode, and the difference between the length values of the pawl plates 311 in the narrow mode is larger than the difference between the length values of the pawl plates 311 in the normal mode.

Specifically, in the narrow mode, as shown in fig. 4, the difference between the end length values of the respective pawl plates 311 is large, that is, the end pitch is large, only one pawl plate 311 is engaged with the ratchet teeth of the ratchet wheel 22 at a time, the other pawl plate 311 is close to the other ratchet teeth, and only the other ratchet teeth can be engaged with the pawl plate 311 by rotating an angle smaller than the ratchet pitch; in the normal mode, the difference in the end length values of the respective detent plates 311, that is, the end pitch is small, and each detent plate 311 is abutted against the same ratchet teeth on the ratchet wheel 22.

It should be noted that the end of each detent plate 311 is specifically defined as an end of each detent plate 311 near the ratchet 22.

In an alternative embodiment, each resilient means 313 is fixed at one end to the corresponding pawl portion 31 and at the other end to the inside of the wrench head 11.

In an alternative embodiment, the sleeving part 21 is an outwards protruding bump, a buckle is further arranged on the sleeving part 21, and the sleeving part 21 is used for fixing sleeves with different specifications.

In an alternative embodiment, the wrench head 11 is fixed on the connecting rod 14, the connecting rod 14 is connected to the handheld portion 12, and a controller 13 is further arranged on the handheld portion 12, and the controller 13 is used for controlling the torque received by the connecting rod 14, and when the torque received by the connecting rod 14 passes through a preset value, a reminder is sent.

Embodiment two:

The present embodiment provides a multifunctional wrench for use in a narrow space, which has the following technical features in addition to the technical scheme including the above embodiment.

The multifunctional wrench used in a narrow space comprises a wrench head 11 arranged at the end part of a hand holding part 12, wherein a sleeving device 2 is arranged in the wrench head 11, the sleeving device 2 comprises a sleeving part 21 and a ratchet wheel 22, circumferentially distributed ratchets are arranged on the outer side of the ratchet wheel 22, a pawl group 3 is further arranged in the wrench head 11, the pawl group 3 consists of a plurality of pawl parts 31 overlapped together and a rotating part 32 penetrating through the pawl parts 31, each pawl part 31 comprises a pawl plate 311 and an elastic device 313, and a pawl rotating shaft hole 312 is formed in one end of the pawl plate 311 far away from the ratchet wheel 22; the rotating part 32 includes a rotating shaft 321 and a plurality of eccentric wheels 322 clamped on the rotating shaft 321 to rotate, each eccentric wheel 322 is clamped in a corresponding pawl rotating shaft hole 312 in each layer of pawl plate 311, each eccentric wheel 322 eccentrically rotates around the rotating shaft 321, the difference between the distance from the far end to the rotating center and the distance from the near end to the rotating center on the eccentric wheel 322 is a moving value, and the moving values of different eccentric wheels 322 in one rotating part 32 are different.

The technical scheme is suitable for the spanner without steering function.

Working principle: principle of narrow mode: in the normal mode, as shown in fig. 5, the ends of the respective detent plates 311 overlap, and each detent plate 311 abuts on the same ratchet teeth on the ratchet wheel 22; in the narrow mode, as shown in fig. 4, the end of each pawl plate 311 has a certain interval, only one pawl plate 311 is meshed with the ratchet teeth of the ratchet wheel 22 at a time, the other pawl plate 311 is close to the other ratchet teeth, and the other ratchet teeth can be meshed with the pawl plate 311 only by rotating an angle smaller than the interval of the ratchet teeth, so that the idle rotation angle of each section is reduced; a method of switching normal or narrow modes: the rotating knob 301 rotates the central gear 30 to drive the end gear 33 to rotate, the end gear 33 drives the rotating shaft 321 to rotate, the rotating shaft 321 and the eccentric wheels 322 rotate in a clamping key matching way, when the eccentric wheels 322 rotate, the near-far ends are switched to be in contact with the pawl rotating shaft holes 312, and the displacement of each pawl plate 311 is different due to different differences of the near-far ends of each eccentric wheel 322, so that the distance between the end parts of each pawl plate 311 is different, and the purpose of switching narrow/normal modes is realized. The method for switching steering comprises the following steps: the turning knob 41 is turned to turn the eccentric jacking block 4, the distal end of the eccentric jacking block 4 is jacked on one of the pawl groups 3, at this time, the other pawl group 3 is meshed with the ratchet wheel 22, and the two pawl groups 3 are symmetrical to each other and are opposite to the meshing direction of the ratchet wheel 22, so that the steering function is realized.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present 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 therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. The utility model provides a multi-functional spanner that uses in narrow space, includes spanner head (11) of installing at handheld portion (12) tip, be provided with in spanner head (11) and cup joint device (2), cup joint device (2) including cup joint portion (21) and ratchet (22), ratchet (22) outside sets up the ratchet of circumference distribution, spanner head (11) inside still is provided with pawl group (3), its characterized in that:

The pawl group (3) is composed of a plurality of pawl parts (31) overlapped together and a rotating part (32) penetrating through the pawl parts (31), each pawl part (31) comprises a pawl plate (311) and an elastic device (313), and the pawl plate (311) is provided with a pawl rotating shaft hole (312) at one end far from the ratchet wheel (22);

The rotating part (32) comprises a rotating shaft (321) and a plurality of eccentric wheels (322) which are clamped on the rotating shaft (321) and rotate, each eccentric wheel (322) is clamped in a corresponding pawl rotating shaft hole (312) in each layer of pawl plate (311), each eccentric wheel (322) eccentrically rotates around the rotating shaft (321), the difference between the distance from the far end to the rotating center and the distance from the near end to the rotating center on each eccentric wheel (322) is a moving value, and the moving values of different eccentric wheels (322) in one rotating part (32) are different.

2. The multifunctional wrench used in narrow spaces according to claim 1, wherein the number of the pawl groups (3) in one wrench head (11) is two, the two pawl groups (3) are symmetrical to each other, an eccentric jacking block (4) is further arranged between the two pawl groups (3) in the wrench head (11), the eccentric jacking block (4) rotates eccentrically, the distal ends of the eccentric jacking block (4) respectively prop against the two symmetrical pawl groups (3) when the eccentric jacking block (4) rotates clockwise and anticlockwise, and the pawl groups (3) propped by the eccentric jacking block (4) are separated from the ratchet wheel (22).

3. A multi-purpose wrench for use in narrow spaces according to claim 2, wherein said eccentric top block (4) is connected to a knob (41), said knob (41) being provided outside the wrench head (11), said knob (41) being adapted to rotate the eccentric top block (4) to switch the idle direction of the socket device (2).

4. A multi-purpose wrench for use in narrow spaces according to claim 2, wherein the rotating parts (32) of two of said ratchet groups (3) are connected with end gears (33), both end gears (33) are meshed with a central gear (30), said central gear (30) rotates to drive both end gears (33) to rotate simultaneously, thereby driving the rotating parts (32) of two ratchet groups (3) to rotate, said central gear (30) is connected with a rotary knob (301), said rotary knob (301) is disposed outside the wrench head (11).

5. The multifunctional wrench for use in narrow spaces according to claim 4, wherein said rotating part (32) rotates a fixed angle each time, said rotating part (32) drives said sun gear (30) to drive said end gear (33) to rotate, said rotating part (32) rotates said end gear (33) a fixed angle each time, and said end gear (33) rotates 180 degrees each time, thereby rotating said eccentric wheel (322) to switch between a normal mode and a narrow mode proximally and distally.

6. The multifunctional wrench for use in narrow spaces according to claim 5, wherein a dial (302) is further provided on the wrench head (11), the dial (302) is provided on a side of the knob (301), and the dial (302) is used for limiting an angle of rotation of the knob (301).

7. The multifunctional wrench for use in narrow spaces according to claim 6, wherein the engagement of the eccentric wheel (322) with the pawl rotation shaft hole (312) is always on a side close to the ratchet wheel (22) by the elastic means (313), the distance between the end of the pawl portion (31) close to the ratchet wheel (22) and the rotation center of the rotation portion (32) is a length value, the proximal end of the eccentric wheel (322) is engaged with the pawl rotation shaft hole (312) in the narrow mode, the distal end of the eccentric wheel (322) is engaged with the pawl rotation shaft hole (312) in the normal mode, and the difference between the length values of the pawl plates (311) in the narrow mode is larger than the difference between the length values of the pawl plates (311) in the normal mode.

8. A multi-purpose wrench for use in confined spaces according to claim 1, wherein each of said resilient means (313) is secured at one end to the corresponding detent portion (31) and at the other end to the inside of the wrench head (11).

9. The multifunctional wrench used in the narrow space according to claim 1, wherein the socket joint part (21) is a convex block protruding outwards, a buckle is further arranged on the socket joint part (21), and the socket joint part (21) is used for fixing sleeves with different specifications.

10. The multifunctional wrench used in narrow spaces according to claim 1, wherein the wrench head (11) is fixed on a connecting rod (14), the connecting rod (14) is connected to a handheld portion (12), a controller (13) is further arranged on the handheld portion (12), the controller (13) is used for controlling torque received by the connecting rod (14), and a prompt is sent when the torque received by the connecting rod (14) passes through a preset value.