CN220108736U - Pruning machine - Google Patents

Abstract

The present utility model provides a trimmer comprising: a power assembly configured to provide power; the blade assembly is driven by the power assembly to reciprocate along a first direction to cut, the blade assembly is coated with a nano coating, a plurality of guide holes penetrating the blade assembly along a second direction perpendicular to the first direction are formed in the blade assembly, and the guide holes comprise two side walls which extend along the first direction and are oppositely arranged; and a plurality of wear members disposed within the guide bore to guide the reciprocating movement of the blade assembly in a first direction; the wear part comprises two outer peripheral surfaces facing the two side walls, the two outer peripheral surfaces are parallel to the side walls, and the outer peripheral surfaces and the side walls are always parallel in the movement process of the blade assembly. Compared with the prior art, the trimmer has strong wear resistance, can avoid the deviation of the movement direction of the blade in the movement process, prolongs the cutting life of the blade assembly and improves the cutting efficiency.

Description

Pruning machine

Technical Field

The utility model relates to the technical field of garden tools, in particular to a trimmer.

Background

The trimmer is used as a garden tool and is mainly applied to the fields of landscaping, flower exhibition, park landscape design and the like, and in addition, the trimmer can be used for trimming agricultural production such as fruit trees, persimmon trees, tea trees and the like. Therefore, the pruning machine is used as a very practical gardening tool or agricultural tool, and can greatly improve the working efficiency and the production benefit.

The basic structure of the trimmer comprises a power machine, a transmission mechanism, a handle, a switch and two blades, wherein the power mechanism drives the two blades to reciprocate through the transmission mechanism so as to finish trimming. A large frictional resistance is generated during the reciprocation of the two blades. In order to reduce frictional resistance, the distance between the two blades cannot be too tight, but too large a gap can in turn lead to cutting or jamming of foreign matter. Therefore, it is necessary to provide wear members to limit the side-to-side movement of the blades and provide proper clearance for both blades.

The wear-resisting part in the prior art is generally a cylindrical shaft sleeve, but the contact of the circular arc surface of the cylindrical shaft sleeve and the two side surfaces of the guide groove of the blade is linear, after the friction is used for a period of time, the gap between the circular arc surface and the side surfaces can be increased, so that the two blades deviate from the original movement direction in the movement process, the blades shake left and right, the performance of the trimmer is finally influenced, and the use experience of a user is reduced.

In view of the foregoing, it is desirable to provide a trimmer that solves the above-described problems.

Disclosure of Invention

The utility model aims to provide a trimmer with long cutting life and high efficiency.

To achieve the above object, the present utility model provides a trimmer comprising: a power assembly configured to provide power;

the blade assembly is driven by the power assembly to reciprocate along a first direction to perform shearing, the blade assembly is coated with a nano coating, a plurality of guide holes penetrating through the blade assembly along a second direction perpendicular to the first direction are formed in the blade assembly, and the guide holes comprise two side walls which extend along the first direction and are oppositely arranged; and

a plurality of wear members disposed within the guide bore to guide the reciprocating movement of the blade assembly in a first direction; the wear part comprises two outer peripheral surfaces facing the two side walls, the two outer peripheral surfaces are parallel to the side walls, and the outer peripheral surfaces and the side walls are always kept parallel in the movement process of the blade assembly.

As a further improvement of the present utility model, the outer peripheral surface is provided with a convex portion extending from the outer peripheral surface toward the side wall, and the convex portion is provided in parallel with the side wall, or the side wall is provided with a convex portion extending from the side wall toward the outer peripheral surface, and the convex portion is provided in parallel with the outer peripheral surface.

As a further improvement of the utility model, in the second direction, the thickness of the protruding portion is 1/5-1/2 of the thickness of the wear part.

As a further improvement of the present utility model, a sliding layer is provided on the outer peripheral surface and/or the side wall, the sliding layer being configured to reduce frictional resistance between the outer peripheral surface and the side wall.

As a further improvement of the present utility model, the blade assembly includes an end portion disposed adjacent to the power assembly and a body portion extending from the end portion in a first direction, the guide holes including a first guide hole disposed on the end portion and a plurality of second guide holes disposed on the body portion, the plurality of second guide holes being disposed at equal intervals on the body portion in the first direction.

As a further improvement of the utility model, the wear-resistant piece is of a square structure, and a fixing hole is arranged in the middle of the wear-resistant piece.

As a further improvement of the utility model, the trimmer further comprises a guide member and a bead fixedly connected, the guide member and the bead being arranged in a stacked relationship with the blade assembly in the second direction, and the bead being arranged between the guide member and the blade assembly, the wear member being in face contact with the bead through the guide hole.

As a further improvement of the utility model, the trimmer further comprises a fastening assembly, the fastening assembly comprises a first fastening piece and a second fastening piece, through holes are formed in the guide piece and the pressing strip, and the first fastening piece penetrates through the fixing hole of the wear-resisting piece arranged in the guide hole and is fixedly connected with the second fastening piece.

As a further improvement of the present utility model, the wear-resistant member includes two connection surfaces adjacent to the two outer peripheral surfaces, the two connection surfaces being disposed opposite to each other, and a projection length of the outer peripheral surfaces on a plane perpendicular to the second direction is 1 to 1.5 times a projection length of the connection surfaces.

As a further improvement of the present utility model, the nanocoating has a color that is different from the color of the blade assembly.

The beneficial effects of the utility model are as follows: compared with the prior art, the nanometer coating is coated on the blade assembly, so that the wear resistance and stability of the blade assembly can be improved, the friction resistance between the blade assembly and the wear-resistant piece is reduced, the service life and corrosion resistance of the blade assembly are prolonged, the maintenance times are reduced, and the nanometer coating has a color indication function. In addition, through the outer peripheral face of wearing part is on a parallel with the lateral wall setting of guide hole, and in the motion process of blade subassembly, the outer peripheral face with the lateral wall remains parallel throughout to make wearing part and blade subassembly's guide hole be the face contact, improve the area of contact between wearing part and the blade subassembly, thereby avoid blade subassembly in the motion process, deviate from original direction of motion and appear sliding, thereby influence the performance of trimming machine, increase of service time improves user experience.

Drawings

Fig. 1 is a schematic view of a part of the structure of a trimmer according to a preferred embodiment of the present utility model.

Fig. 2 is an exploded view of the structure of fig. 1.

Fig. 3 is a schematic view of the blade assembly of fig. 1.

Fig. 4 is a schematic view of the wear part of fig. 1.

Fig. 5 is a top view of the wear member of fig. 4.

Fig. 6 is a top view of the wear member of fig. 1 with the blade assembly installed.

Fig. 7 is an exploded view of the structure of the fastening assembly of fig. 1.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in detail with reference to the accompanying drawings and specific embodiments.

In this case, in order to avoid obscuring the present utility model due to unnecessary details, only the structures and/or processing steps closely related to the aspects of the present utility model are shown in the drawings, and other details not greatly related to the present utility model are omitted.

In addition, it should be further noted that 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.

Referring to fig. 1 to 7, a part of a trimmer 100 according to a preferred embodiment of the present utility model is shown. The trimmer 100 includes a housing (not shown), a power assembly (not shown), a blade assembly 1, a wear member 2, a guide member 3, a bead 4, and a fastening assembly 5.

A housing is provided at one end of the blade assembly 1, and a power supply assembly (not shown) is provided within the housing, which provides power to the power assembly of the trimmer 100. In this embodiment, the power supply assembly may be a removable battery assembly disposed within the housing, and in other embodiments, the trimmer 100 may be a wired or wireless power tool. The shell is also provided with a handle and a button. The handle is configured to be held by a user. The button is configured for operation by a user to turn the trimmer 100 on or off or to speed the trimmer 100.

Further, a safety device (not shown) may be further provided on the housing, and the trimmer 100 can be turned on only by activating the safety device and then activating the button, so as to avoid the situation that the blade assembly 1 is accidentally driven due to misoperation.

A power assembly is disposed within the housing assembly and is configured to provide power to the trimmer 100 to drive the reciprocating motion of the blade 12 assembly 1 to effect a scissor-like cutting action. In this embodiment, the power assembly may include a motor and a transmission assembly, where rotation of the motor drives rotation of the transmission assembly, and the transmission assembly drives the movable blade 12 in the blade 12 assembly 1 to reciprocate relative to the fixed blade 11. In other embodiments, the power assembly may also be a motor and other transmission assembly.

The blade assembly 1 is configured to be driven by a power assembly to reciprocate in a first direction to shear, having a length extending in the first direction. I.e. the first direction, i.e. the length direction of the blade assembly 1. The blade assembly 1 includes a movable blade 12 and a fixed blade 11 stacked in the second direction. The second direction is perpendicular to the first direction, and in this embodiment, the second direction is a vertical direction.

The blade assembly 1 comprises a fixed blade 11 and a movable blade 12 which are overlapped along the second direction, and the movable blade 12 is connected with the power assembly so as to be driven by the power assembly to reciprocate along the first direction relative to the fixed blade 11. In this example, the fixed blade 11 is disposed above the movable blade 12, the fixed blade 11 is fixedly connected to the housing, and the movable blade 12 is driven by the power assembly to reciprocate in the first direction.

The stationary blade 11 and the movable blade 12 each include an end portion 13 disposed adjacent to the power assembly and a body portion 14 extending from the end portion 13 in the first direction. The main body 14 is provided with a plurality of tooth edge portions 15, and the plurality of tooth edge portions 15 are provided in order along the first direction. When the movable blade 12 reciprocates in the first direction relative to the fixed blade 11, the fixed blade 11 and the tooth edge portion 15 on the movable blade 12 reciprocate in opposite phases, so that branches, flowers, and the like can be cut off.

Further, the tooth edge portion 15 gradually decreases in cross-sectional area from the end near the main body portion 14 to the end far from the main body portion 14, so that there can be a larger space to cut larger branches and the like. In addition, an inclined slope is provided at the end 13 of the tooth edge portion 15 to form a sharper shearing surface, thereby improving shearing efficiency.

Further, the blade assembly 1 is coated with the nano coating, so that the wear resistance of the blade assembly 1 can be improved by coating the nano coating, meanwhile, the friction resistance between the blade assembly 1 and the wear-resistant piece 2 is reduced, and the service life of the blade assembly 1 is prolonged. The nano coating has the characteristics of high hardness, high temperature resistance, corrosion resistance, oxidation resistance, friction resistance, high smoothness, low friction, strong adhesive force and the like, and has stable, reliable, uniform and consistent performance, the friction resistance of the relative movement of the fixed blade 11 and the movable blade 12 can be reduced, the wear resistance of the blade assembly 1 is increased, the adhesion of cut objects is reduced, the service life is prolonged, and the maintenance times are reduced.

Further, the whole blade assembly 1 is entirely covered with the nano-coating, that is, the nano-coating entirely covers the whole surfaces of the fixed blade 11 and the movable blade 12, including the surfaces of the end portion 13, the main body portion 14, the tooth edge portion 15, and the guide hole 16 provided in the blade assembly 1.

Further, coating techniques of "cathodic arc and multiple arc ions" may be employed. The nano-coating has good oxidation resistance, prevents the blade of the trimmer 100 from surface abrasion during long-time use, prevents rust, and prevents adhesion of cut materials. Moreover, the nano coating has high hardness, can improve the surface hardness of the blade assembly 1 and increase the wear resistance of the blade assembly 1, thereby prolonging the service life of the blade assembly 1 and reducing the maintenance times. And the nano-coating can reduce the friction coefficient of the blade assembly 1, promote the surface 'flowing' of the blade assembly 1, produce smoother products and improve the appearance performance of the trimmer 100. Moreover, the friction coefficient can be reduced in the friction process with the wear-resistant piece 2, so that the friction resistance is reduced, and the service lives of the wear-resistant piece 2 and the blade assembly 1 are prolonged.

Further, the nano-coating has a color different from that of the blade assembly 1, so that a user can be conveniently prompted to find out whether the blade assembly 1 is damaged or not in time. For example, in the present embodiment, the blade assembly 1 is metallic bright, and the nano-coating is black, and the black nano-coating is coated on the outer side of the metallic bright blade assembly 1. When a user sees the metallic bright color in the use process, the user can timely find that the nano coating on the blade assembly 1 is damaged, so that whether the blade assembly 1 is damaged can be checked, and the user is reminded to timely overhaul the blade assembly 1.

Further, a plurality of guide holes 16 penetrating the blade assembly 1 in a second direction perpendicular to the first direction are provided on the blade assembly 1, and the guide holes 16 include two side walls 163 extending in the first direction and disposed opposite to each other. Further, the guide hole 16 is a bar-shaped hole having a length direction along the first direction, and two side walls 163, i.e., side walls 163 in the length direction thereof. By providing the guide hole 16, a possibility of movement is provided for the movable blade 12 to be able to reciprocate relative to the fixed blade 11, and the guide hole 16 guides and limits the movement direction of the movable blade 12.

Further, the guide holes 16 include a first guide hole 16116 provided on the end portion 13 and a plurality of second guide holes 16216 provided on the body portion 14. The length of the first guide hole 16116 is greater than the length of the second guide hole 16216. By providing a longer first guide hole 16116, a plurality of wear members 2 may be provided within the first guide hole 16116 to avoid vibrations caused by the drive train of the power assembly while improving the connection stability of the blade assembly 1.

The plurality of second guide holes 16216 are provided at equal intervals on the main body portion 14 in the first direction. By providing the second guide holes 16216 at equal intervals, and each of the second guide holes 16216 corresponds to one of the wear-resistant members 2, stability during movement of the movable blade 12 can be improved and deviation in the movement direction can be avoided.

Further, the trimmer 100 further comprises a plurality of wear parts 2. The wear part 2 is arranged in the guide bore 16 to guide the reciprocating movement of the blade assembly 1 in the first direction.

Further, the wear part 2 is of square construction, for example, a square bushing. The wear-resistant member 2 includes two outer peripheral surfaces 21 facing the two side walls 163 and two connecting surfaces 22 adjacent to the two outer peripheral surfaces 21, the two connecting surfaces 22 being disposed opposite to each other. By arranging the wear-resistant member 2 in a square structure so that the contact between the wear-resistant member 2 and the guide hole 16 is in surface contact, that is, the whole outer circumferential surface 21 is rubbed in the movement process of the blade assembly 1, thereby replacing linear friction between the cylindrical shaft sleeve and the guide hole 16 in the prior art, the situation that the gap between the wear-resistant member 2 and the guide hole 16 is increased after the blade assembly 1 is used for a certain period of time can be avoided, or the wear-resistant member 2 and the guide hole 16 are not completely overlapped, so that the movement direction of the blade assembly 1 is swayed left and right, and the cutting efficiency is reduced.

Referring to fig. 4 to 6, the two outer peripheral surfaces 21 are disposed parallel to the side wall 163, and the outer peripheral surfaces 21 and the side wall 163 remain parallel throughout the movement of the blade assembly 1. By the arrangement, the wear-resistant piece 2 and the guide hole 16 can be always in surface contact, so that the stability of the movement of the blade assembly 1 can be improved, meanwhile, the phenomenon that the movement direction of the blade assembly 1 is deviated due to the fact that the direction of the wear-resistant piece 2 and the direction of the guide hole 16 are not coincident is avoided, the cutting life of the blade assembly is prolonged, and the cutting efficiency of the blade assembly is also improved. In addition, by arranging the outer peripheral surface 21 parallel to the side wall 163, and keeping the outer peripheral surface 21 parallel to the side wall 163 all the time during the movement of the blade assembly 1, the vibration of the blade assembly 1 caused during the reciprocation of the blade assembly 1 can also be suppressed.

Referring to fig. 4 and 5, the projection length L1 of the outer peripheral surface 21 is 1 to 1.5 times the projection length L2 of the connecting surface 22 on a plane perpendicular to the second direction. That is, in the case of the uniform height, the area of the outer peripheral surface 21 is 1 to 1.5 times larger than the area of the connection surface 22 and the area of the connection surface 22. Preferably, the area of the outer peripheral surface 21 is 1.2 times the area of the connecting surface 22. With this arrangement, the reciprocating movement of the movable blade 12 in the first direction can be smoothly guided while reducing the frictional resistance.

Further, a fixing hole 24 is provided in the middle of the wear part 2. By providing the fixing holes 24, the wear part 2 can be fixedly connected with the guide part 3 through the fastening assembly 5, so that the wear part can be driven by the power assembly to drive the movable blade 12 to reciprocate relative to the fixed blade 11 in the first direction.

In a preferred embodiment, the outer peripheral surface 21 is provided with a protrusion (not shown) extending from the outer peripheral surface 21 in the direction of the side wall 163, and the protrusion is disposed parallel to the side wall 163. Alternatively, the side wall 163 is provided with a convex portion extending from the side wall 163 toward the outer peripheral surface 21, and the convex portion is provided in parallel with the outer peripheral surface 21. By providing the boss, the contact area between the wear-resistant member 2 and the guide hole 16 can be reduced on the premise of keeping the wear-resistant member 2 and the guide hole 16 in surface contact, so that the frictional resistance between the wear-resistant member 2 and the guide hole 16 is reduced on the premise of ensuring that the movement direction of the blade assembly 1 is not changed, thereby prolonging the service life of the blade assembly 1 and improving the cutting efficiency of the trimmer 100.

Further, in the second direction, the thickness of the protruding portion is 1/5-1/2 of the thickness of the wear member 2. By setting the proper thickness of the protruding part, the vibration of the blade assembly 1 can be reduced on the premise of surface contact, and meanwhile, the resistance of the reciprocating motion of the blade assembly 1 is reduced.

In another preferred embodiment, in order to reduce the frictional resistance between the wear member 2 and the guide hole 16 without changing the moving direction of the blade assembly 1, a sliding layer is provided on the outer peripheral surface 21 and/or the side wall 163, the sliding layer being configured to reduce the frictional resistance between the outer peripheral surface 21 and the side wall 163. For example, the sliding layer may be formed of a material having a smooth surface and high wear resistance.

In this embodiment, the surface of the guide hole 16 is coated with a nano-coating, which can reduce the frictional resistance between the wear-resistant member 2 and the guide hole 16 in addition to avoiding abrasion, improving the service life and corrosion resistance of the blade assembly 1. That is, in this embodiment, the sliding layer is a nano-coating, and in other embodiments, the sliding layer may be made of other materials that can reduce friction resistance.

Further, the trimmer 100 further includes a guide member 3 and a presser bar 4, the guide member 3 and the presser bar 4 are fixedly connected, the guide member 3 and the presser bar 4 are stacked with the blade assembly 1 in the second direction, the presser bar 4 is disposed between the guide member 3 and the blade assembly 1, and the wear member 2 is in surface contact with the presser bar 4 through the guide hole 16. That is, the wear part 2 further comprises a force-receiving surface 23 in surface contact with the bead 4.

Because layering 4 is very thin, when wearing part 2 adopts square structure, can improve wearing part 2 and layering 4's area of contact, namely improves the area of atress face 23 to can have bigger area contact layering 4, avoid layering 4 to produce deformation when being locked by fastening assembly 5, thereby cause blade assembly 1 operation to be obstructed, and then lead to power pack's consumption great. In addition, the deformation amount of the pressing bar 4 is reduced, and the increase of friction among the components can be avoided, so that the abrasion of the whole blade component 1 is accelerated.

Further, the trimmer 100 further comprises a fastening assembly, the fastening assembly 5 comprises a first fastening piece 51 and a second fastening piece 52, through holes are formed in the guide piece 3 and the pressing bar 4, and the first fastening piece 51 penetrates through the fixing hole 24 of the wear-resisting piece 2 arranged in the guide hole 16 and is fixedly connected with the second fastening piece 52.

In this embodiment, the first fastener 51 is a bolt, including a base and a stud extending upward from the base, the stud is provided with external threads, the second fastener 52 is a nut, and the inner surface of the nut is provided with internal threads. The blade assembly 1, the wear part 2, the guide part 3, the bead 4, etc. are assembled together by means of the first fastener 51 and the second fastener 52.

When the trimmer 100 starts to be assembled, the wear-resistant member 2 is assembled on the first fastening member 51 through the fixing hole 24, then the movable blade 12 and the fixed blade 11 are sequentially penetrated on the first fastening member 51 provided with the wear-resistant member 2 through the guide hole 16, then the pressing bar 4 and the through holes on the guide member 3 are sequentially penetrated on the first fastening member 51, wherein the pressing bar 4 is arranged between the guide member 3 and the blade assembly 1, finally the second fastening member 52 is penetrated through the first fastening member 51 from the first end of the guide member 3 far away from the first fastening member 51, and finally the first fastening member 51 and the second fastening member 52 are locked, thus completing all the assembly.

When the pruning machine 100 starts to prune branches or flowers and plants, the power component provides power to drive the guide piece 3 to reciprocate, and as the guide piece 3 is fixedly connected with the wear-resisting piece 2 and the movable blade 12 through the fastening component 5, the movable blade 12 can be driven to reciprocate along the extending direction (namely, the first direction) of the guide hole 16 relative to the fixed blade 11, so that a larger shearing force or cutting force is formed to finish the pruning work.

In summary, according to the trimmer 100 of the present utility model, the blade assembly 1 is coated with the nano-coating, so that the wear resistance of the blade assembly 1 can be improved, the frictional resistance between the blade assembly 1 and the wear-resistant member 2 can be reduced, and the service life of the blade assembly 1 can be prolonged. In addition, through setting up the outer peripheral face 21 of wearing part 2 parallel to the lateral wall 163 of guide hole 16, and in the motion process of blade subassembly 1, outer peripheral face 21 and lateral wall 163 remain parallel all the time, thereby make wearing part 2 and the guide hole 16 of blade subassembly 1 be the face contact, improve the area of contact between wearing part 2 and blade subassembly 1, thereby avoid blade subassembly 1 to deviate from original direction of motion in the motion process and appear sliding, thereby influence the performance of trimming machine 100, increase of service time improves user experience. In addition, by setting the wear-resistant member 2 to be square, the contact area between the wear-resistant member 2 and the pressing strip 4 can be increased, and the pressing strip 4 is prevented from being deformed to generate negative effects.

The above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and it should be understood by those skilled in the art that the technical solution of the present utility model may be modified or substituted without departing from the spirit and scope of the technical solution of the present utility model.

Claims (10)

1. A trimmer, comprising:

a power assembly configured to provide power;

the blade assembly is driven by the power assembly to reciprocate along a first direction to perform shearing, the blade assembly is coated with a nano coating, a plurality of guide holes penetrating through the blade assembly along a second direction perpendicular to the first direction are formed in the blade assembly, and the guide holes comprise two side walls which extend along the first direction and are oppositely arranged; and

a plurality of wear members disposed within the guide bore to guide the reciprocating movement of the blade assembly in a first direction; the wear part comprises two outer peripheral surfaces facing the two side walls, the two outer peripheral surfaces are parallel to the side walls, and the outer peripheral surfaces and the side walls are always kept parallel in the movement process of the blade assembly.

2. A trimmer according to claim 1, wherein the outer peripheral surface is provided with a projection extending from the outer peripheral surface in a direction toward the side wall and arranged in parallel with the side wall, or wherein the side wall is provided with a projection extending from the side wall in a direction toward the outer peripheral surface and arranged in parallel with the outer peripheral surface.

3. A trimmer according to claim 2, wherein in the second direction the thickness of the projection is 1/5-1/2 of the thickness of the wear member.

4. A trimmer according to claim 1 wherein a sliding layer is provided on the outer peripheral surface and/or the side wall, the sliding layer being configured to reduce frictional resistance between the outer peripheral surface and the side wall.

5. The trimmer of claim 1, wherein the blade assembly includes an end disposed proximate the power assembly and a body portion extending in a first direction from the end, the guide holes including a first guide hole disposed on the end and a plurality of second guide holes disposed on the body portion, the plurality of second guide holes being equally spaced on the body portion in the first direction.

6. A trimmer according to claim 1, wherein the wear member is of square configuration and a fixing hole is provided in the middle of the wear member.

7. The trimmer of claim 1, further comprising a fixedly connected guide and bead disposed in stacked relation to the blade assembly in the second direction, the bead being disposed between the guide and blade assembly, the wear member being in face contact with the bead through the guide bore.

8. The trimmer of claim 7, further comprising a fastening assembly including a first fastener and a second fastener, the guide and the bead each having a through hole, the first fastener passing through a securing hole of a wear member disposed in the guide hole and the through hole being fixedly connected to the second fastener.

9. A trimmer according to claim 1, wherein the wear-resistant member includes two connecting surfaces adjacent to the two outer peripheral surfaces, the two connecting surfaces being disposed opposite to each other, and the projection length of the outer peripheral surfaces being 1 to 1.5 times the projection length of the connecting surfaces on a plane perpendicular to the second direction.

10. The trimmer of claim 1, wherein the nanocoating has a color that is different from the color of the blade assembly.