CN216299543U - Chain saw - Google Patents

Abstract

The utility model provides a chain saw, and particularly relates to the field of cutting tools. The chain saw comprises a shell, a guide plate, a saw chain, a cutter protection cover and a bolt, wherein a guide block and a first connecting hole are arranged on one side of the shell, a limiting groove matched with the guide block is formed in the guide plate, the saw chain is installed on the guide plate and driven by a driving device arranged in the shell, a second connecting hole corresponding to the first connecting hole is formed in the cutter protection cover, the bolt can rotate and axially move along the second connecting hole to be kept on the cutter protection cover, and when the guide plate is installed, the bolt penetrates through the guide plate and is in threaded connection with the first connecting hole so as to fasten the guide plate between the cutter protection cover and the cutter shell. The chain saw is simple to assemble, and the bolt is always kept on the cutter protection cover, so that the chain saw can be prevented from being lost in the assembling process.

Description

Chain saw

Technical Field

The utility model relates to the technical field of cutting tools, in particular to a chain saw.

Background

A chain saw is a tool commonly used for cutting trees or concrete, stone, and it relies on the movement of cutting teeth on a chain to generate a cutting force for cutting. To drive the chain, a sprocket is usually provided, the teeth of which engage with the links of the chain, the sprocket being driven by a drive motor to move the chain.

At present, a chain saw on the market generally adopts a universal bolt and nut structure to install a cutter on a shell, and the structure mode has the advantages of universal parts, low cost and the like. However, the connecting structure has large dimensional tolerance and low positioning precision of the mounted cutter due to the generalization of fastening parts, so that the service life of the connecting structure is short. Moreover, this structure is difficult to assemble on site: the guide plate and the tool guard must be clamped simultaneously in the assembly position and then the nut is screwed onto the fastening bolt, which may fall off and be lost during the assembly process. In particular in the case of a construction with two or more fastening bolts, the weight of the guide plate which has not been fixed last can lead to a distortion of the threaded connection. Therefore, it is important to develop a new tool mounting fastening structure.

SUMMERY OF THE UTILITY MODEL

In view of the above shortcomings of the prior art, the present invention provides a chain saw to improve the problem of easy loss of fasteners during tool assembly.

In order to achieve the above objects and other related objects, the present invention provides a chain saw, including a housing, a guide plate, a saw chain, a cutter guard, and a bolt, wherein one side of the housing is provided with a guide block and a first connection hole, the guide plate is provided with a limit groove engaged with the guide block, and the saw chain is mounted on the guide plate and driven by a driving device disposed in the housing; the cutter protective cover is provided with a second connecting hole corresponding to the first connecting hole; a bolt is rotatably and axially movably retained on the tool guard along the second coupling hole, the bolt being threadably coupled to the first coupling hole through the guide plate to secure the guide plate between the tool guard and the housing.

In an example of the utility model, a pressing bushing in interference fit with the second connecting hole is arranged in the second connecting hole, and a first matching hole and a second matching hole with successively increased hole diameters are arranged in the pressing bushing.

In an example of the present invention, the bolt includes a stopper portion, a rod portion, and a threaded portion, the stopper portion is stopped outside the first fitting hole, one end of the rod portion is connected to the stopper portion, and the other end of the rod portion extends into the second fitting hole and is connected to the threaded portion.

In an example of the present invention, the first connection hole is provided with an internal thread engaged with the threaded portion.

In an example of the utility model, the rod-shaped part is provided with a clamping ring, and the outer diameter of the clamping ring is larger than the first matching hole and smaller than the second matching hole.

In one example of the utility model, the rod-shaped part is provided with a collar groove, and the collar is clamped in the collar groove.

In an example of the utility model, the distance from the collar to the joint of the first matching hole and the second matching hole is greater than or equal to the depth of the threaded part screwed into the first connecting hole.

In an example of the present invention, an end of the pressing bush facing the first connection hole is provided with a flange extending outward in a radial direction, and an end of the second connection hole facing the first connection hole is provided with a groove engaged with the flange.

In an example of the utility model, the chain saw further comprises a tension adjusting device mounted on the housing, the tension adjusting device comprises a driving gear, a driven gear meshed with the driving gear, a threaded rod mounted on the driven gear, and a pin shaft in threaded connection with the threaded rod, one end of the pin shaft is connected with the guide plate, the threaded rod rotates to drive the pin shaft to slide along the threaded rod, and the guide plate connected with the pin shaft is further driven to move along the guide block.

In an example of the present invention, the guide plate is provided with a tensioning hole matching with the pin shaft, and one end of the pin shaft is inserted into the tensioning hole to drive the guide plate to move.

In an example of the utility model, the driving gear is provided with an adjusting shaft fixedly connected with the driving gear, the cutter protective cover is provided with an adjusting hole for the adjusting shaft to pass through, and the adjusting shaft passes through the limiting groove and is installed in the adjusting hole.

In an example of the utility model, the tension adjusting device further comprises a tension shell, the tension shell is clamped on the shell, and the driving gear, the driven gear and the threaded rod are mounted on the tension shell.

In an example of the utility model, a through hole for the adjusting shaft to pass through is formed in the tensioning shell, a first supporting wall and a second supporting wall are oppositely arranged on the tensioning shell, a driven gear accommodating groove is formed between the first supporting wall and the second supporting wall, and first mounting grooves for mounting threaded rods are symmetrically formed in the first supporting wall and the second supporting wall.

In an example of the utility model, the guide block is detachably connected with the shell, and the shell is provided with a mounting hole matched with the guide block.

In an example of the present invention, the guide block is provided at both sides thereof with a column structure extending toward the inside of the housing, and the first connection hole is provided on the column structure.

The chain saw keeps the bolt on the cutter protection cover in a rotatable and axially movable manner along the connecting hole, when the cutter is replaced, the cutter protection cover is taken off from the shell only by unscrewing the bolt, and the bolt is always kept on the cutter protection cover, so that the bolt can be prevented from being lost; when the cutter is assembled, the guide block is matched with the limiting groove on the guide plate to perform preliminary positioning, the guide plate is limited to move in the vertical direction, and the bearing capacity of the cutter can be improved due to the large contact area between the guide block and the guide plate, so that the service life of the cutter is prolonged to a certain extent; the guide plate can slide along the guide block to achieve the purpose of adjusting the tightness of the saw chain. The tool protection cover is provided with a pressing bush with a step hole, the step hole is matched with the clamping ring to limit the bolt in the pressing bush, so that the bolt moves along the axial direction of the hole and is always kept in the hole, the bolt is prevented from being lost, and the bolt is rotated to move along the axial direction of the connecting hole to fasten the tool between the tool protection cover and the shell; the distance from the clamping ring to the joint of the first matching hole and the second matching hole is set to be larger than the limit depth of the threaded part screwed into the first connecting hole, so that the cutter protection cover and the chain saw shell can be screwed tightly by the bolt; the bottom of the pressing bush is provided with a flange which is outward along the radial direction, and the bush can be prevented from falling off from the connecting hole of the cutter protective cover by utilizing the matching of the flange and the groove; the shell is provided with a tension adjusting device, and the tension adjusting device can drive the guide plate to move along the guide block so as to adjust the tightness of the saw chain.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of an embodiment of a chain saw of the present invention;

FIG. 2 is a schematic view of the chain saw of the present invention with the tool guard removed in one embodiment;

FIG. 3 is an enlarged view of region I of FIG. 2;

FIG. 4 is a schematic view of a chain saw of the present invention with the tool and the tool guard removed in one embodiment;

FIG. 5 is an enlarged view of area II of FIG. 4;

FIG. 6 is a schematic cross-sectional view of a chain saw of the present invention in one embodiment;

FIG. 7 is an enlarged schematic view of region III of FIG. 6;

FIG. 8 is a schematic view of a guide plate in one embodiment of the chain saw of the present invention;

FIG. 9 is a schematic view of a tool guard of an embodiment of the chain saw of the present invention;

FIG. 10 is a schematic partial cross-sectional view of FIG. 9;

FIG. 11 is a schematic view of a compression bushing of a chain saw of the present invention in one embodiment;

FIG. 12 is a schematic cross-sectional view of FIG. 11;

FIG. 13 is a schematic view of a bolt of an embodiment of a chain saw of the present invention;

FIG. 14 is a schematic view of an assembly of a compression bushing and a bolt of a chain saw of the present invention;

FIG. 15 is a schematic view of a tension adjusting device of a chain saw according to an embodiment of the present invention;

FIG. 16 is a schematic view of another angle of the tension adjustment mechanism of the chain saw of the present invention;

fig. 17 is a schematic view of a tensioning housing of the chain saw according to an embodiment of the utility model.

Description of the element reference numerals

100. A housing; 101. a tool mounting seat; 1011. a second mounting groove; 1012. a threaded rod receiving groove; 102. a guide block; 1021. a cylindrical structure; 103. a first connection hole; 104. a housing; 200. a cutter; 201. a guide plate; 2011. a limiting groove; 2012. tensioning holes; 202. a saw chain; 203. a sprocket; 300. a cutter shield; 301. a second connection hole; 3011. a groove; 302. compressing the bushing; 3021. a first mating hole; 3022. a second mating hole; 3023. a flange; 303. an adjustment hole; 400. a bolt; 401. a stopper portion; 402. a rod-shaped portion; 4021. a collar groove; 403. a threaded portion; 404. a collar; 500. a tension adjusting device; 501. a driving gear; 502. a driven gear; 503. a threaded rod; 504. a pin shaft; 505. an adjustment shaft; 506. tensioning the shell; 5061. a first support wall; 5062. a second support wall; 5063. a driven gear accommodating groove; 5064. a first mounting groove; 5065. a through hole; 5066. an arc-shaped surface; 6. a handle.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The utility model is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. It is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention. Test methods in which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under conditions recommended by the respective manufacturers.

It should be understood that the terms "upper", "lower", "left", "right", "middle" and "one" used herein are for clarity of description only, and are not intended to limit the scope of the utility model, and that changes or modifications in the relative relationship may be made without substantial technical changes and modifications.

Referring to fig. 1 to 17, the present invention is directed to a chain saw to solve the problem of the fastener being lost during the installation of the tool.

Referring to fig. 1 to 3, the present invention provides a chain saw including a housing 100, a driving device (not shown) disposed in the housing 100, a cutter 200 mounted on the housing 100, and a cutter fastening structure for mounting the cutter. One side of the housing 100 is provided with a guide block 102 and a first connection hole 103, the cutter 200 comprises a guide plate 201 and a saw chain 202, the guide plate 201 is provided with a limit groove 2011 matched with the guide block 102, and the saw chain 202 is installed on the outer edge of the guide plate 201 and driven by a driving device. The cutter fastening structure includes a cutter guard 300 having a second coupling hole 301 (see fig. 9) to be coupled with the first coupling hole 103, and a bolt 400 rotatably and axially movably held on the cutter guard 300 at all times along the second coupling hole 301, the bolt 400 being threadedly coupled with the first coupling hole 103 through the guide plate 201 to fasten the guide plate 201 between the cutter guard 300 and the housing 100 when the chain saw is mounted with the cutter 200.

Referring to fig. 1, 3 to 5, in an example, a position of the housing 100 where the tool 200 is mounted is referred to as a tool mounting base 101, the guide block 102 is disposed on the tool mounting base 101, the first connection hole 103 is disposed at one side of the guide block 102, one end of the guide plate 201 is primarily positioned by being matched with the guide block 102 through the limiting groove 2011 and is fixedly connected with the first connection hole 103 through the bolt 400, and the other end of the guide plate 201 extends outward beyond the housing 100. The saw chain 201 is installed on the outer edge of the guide plate 201 and can move along the circumferential direction of the guide plate 201 under the driving of the driving device to complete the cutting action, for example, the outer edge of the guide plate 201 is provided with a groove for installing the saw chain 202, and the cutting teeth of the saw chain 202 are inserted into the groove. The housing 100 is provided with a chain wheel 203 driven by a driving device, the chain wheel 203 is positioned at one side of the cutter mounting seat 101, one end of the saw chain 202 is mounted on the chain wheel 203, and the other end of the saw chain 202 is guided to move around the outer edge of the guide plate 201 under the driving of the chain wheel 203. A handle 6 is arranged above the housing 100 in a central position and at the end facing away from the guide plate 201, and the chain saw can be operated or carried by means of the two handles 6.

Referring to fig. 3 and 8, as an example, the size of the limit groove 2011 on the guide plate 201 along the length direction of the guide plate 201 is larger than the size of the guide block 102, and the size along the width direction of the guide plate 201 is matched with the guide block 102, at this time, the limit groove 2011 is clamped on the guide block 201 to play a certain limit role in the vertical direction, and under the action of an external force, the guide plate 201 can slide along the guide block 102 in the horizontal direction to achieve the purpose of adjusting the tightness of the saw chain 202. When the cutter needs to be replaced, the bolt 400 is only required to be loosened, and then the cutter protective cover 300 is detached, so that the problem that the bolt is easy to lose is solved because the bolt 400 is always kept on the cutter protective cover 300.

Referring to fig. 6, 7, and 9 to 14, in an embodiment, a pressing bushing 302 is disposed in the second connecting hole 301, a first fitting hole 3021 and a second fitting hole 3022, which have sequentially increasing hole diameters, are disposed in the pressing bushing 302, the first fitting hole 3021 is disposed at an end of the pressing bushing 302 facing to the outside, the second fitting hole 3022 is disposed at an end of the pressing bushing 302 facing to the inside, and the first fitting hole 3021 and the second fitting hole 3022 are communicated to form a stepped hole. The bolt 400 comprises a stopping part 401, a rod part 402 and a thread part 403, wherein the outer diameter of the stopping part 401 is larger than the hole diameter of the first matching hole 3021, the stopping part stops outside the first matching hole 3021, one end of the rod part 302 is connected with the stopping part 401, the other end of the rod part 302 extends into the second matching hole 3022 and is connected with the thread part 403, the outer diameter of the rod part 402 is smaller than the hole diameter of the first matching hole 3021, in order to ensure that the bolt 400 is always kept on the tool guard 300, the rod part 402 is provided with a clamping ring 404, the outer diameter of the clamping ring 404 is larger than the hole diameter of the first matching hole 3021 and smaller than the hole diameter of the second matching hole 3022 after being installed on the rod part 402, and the design of the clamping ring 404 can ensure that the bolt 400 can freely move along the axial direction of the second connecting hole 301, and can always keep the bolt 400 on the tool guard 300, and prevent the bolt 400 from being lost. Preferably, the collar 404 is removably mounted on the shaft 401 to facilitate removal of the bolt 400, for example, the shaft 402 is provided with a collar groove 4021, and the collar 404 is snapped into the collar groove 4021. The threaded portion 403 extends in the direction of the first connection hole 103, and correspondingly, an internal thread matching with the threaded portion 403 is provided in the first connection hole 103. Preferably, the distance r from the collar 404 to the junction of the first mating hole 3021 and the second mating hole 3022 is greater than or equal to the limit depth s of the threaded portion 403 screwed into the internal thread 1031 to ensure the tight connection of the bolt 400 with the first connection hole 103. Of course, in other embodiments, the pressing bushing 302 may not be provided, and the first and second fitting holes may be directly formed in the second connecting hole 301.

Referring to fig. 10 and 11, in an example, the pressing bushing 302 is press-fitted into the second connection hole 301 in an interference fit manner, in order to prevent the pressing bushing 302 from being pulled out of the second connection hole 301 by an external force, a flange 3023 is extended outward from one end of the pressing bushing 302 facing the first connection hole 103 along a radial direction thereof, correspondingly, a groove 3011 matched with the flange 3023 is provided at one end of the second connection hole 301 facing the first connection hole 103, the groove 3011 is expanded outward along the radial direction of the second connection hole 301, and the flange 3023 of the pressing bushing 302 is clamped in the groove 3011 of the second connection hole 301.

Referring to fig. 1, 3, 5, 15 to 17, in an embodiment, the cutter mounting base 101 is further provided with a tension adjusting device 500, and the tension adjusting device 500 is disposed between the guide plate 201 and the sprocket 203 for adjusting the tightness of the saw chain 200. The tension adjusting device 500 comprises a driving gear 501, a driven gear 502, a threaded rod 503 and a pin 504, wherein the driving gear 501 is provided with an adjusting shaft 505 fixedly connected with the driving gear 501, the cutter protective cover 300 is provided with an adjusting hole 303 for the adjusting shaft 505 to pass through, the adjusting shaft 505 passes through a limiting groove 2011 of the guide plate 201 and is installed in the adjusting hole 303, and the adjusting shaft 505 is rotated to drive the driving gear 501 to rotate. Driven gear 502 is connected with the meshing of driving gear 501, and axis mutually perpendicular between them, and the one end fixed mounting of threaded rod 503 is on driven gear 502, and the other end extends to one side of baffle 201, and round pin axle 504 radially sets up a screw hole that runs through along it, and round pin axle 504 passes through the screw hole and realizes threaded connection with threaded rod 503, and the one end of round pin axle 504 links to each other with baffle 201. For example, a tension hole 2012 matched with the pin 504 is provided on the guide plate 201, and one end of the pin 504 is correspondingly inserted into the tension hole 2012. The adjusting shaft 505 is rotated by external force to drive the driving gear 501 to rotate, the driving gear 501 rotates to drive the driven gear 502 to rotate, and further the threaded rod 503 is driven to rotate, and the pin shaft 504 is connected with the threaded rod 503 in a threaded manner, so that the threaded rod 503 rotates, and the pin shaft 504 slides on the threaded rod 503 to drive the guide plate 201 to move left and right along the guide block 102, and the purpose of adjusting the tightness of the saw chain 201 is achieved.

Referring to fig. 5, 15 to 17, in an example, the tension adjusting device 500 further includes a tension housing 506, the tension housing 506 is mounted on the tool mounting base 101, and the driving gear 501, the driven gear 502 and the threaded rod 503 are mounted in the tension housing 506. The tension housing 506 is provided with a through hole 5065 for the adjusting shaft 505 to pass through, the bottom of the tension housing is provided with a first supporting wall 5061 and a second supporting wall 5062, a driven gear accommodating groove 5063 is formed between the first supporting wall 5061 and the second supporting wall 5062, and the first supporting wall 5061 and the second supporting wall 5062 are correspondingly provided with a first installing groove 5064 for installing the threaded rod 503. When the driving gear is installed, the driven gear 502 is rotatably installed in the driven gear accommodating groove 5063 between the first support wall 5061 and the second support wall 5062, one end of the threaded rod 503 passes through the first installation groove 5064 and is installed on the driven gear 502, the driving gear 501 is meshed with the driven gear 502 and then is located above the first support wall 5061 and the second support wall 5062, the adjusting shaft 505 passes through the through hole 5065 and is installed in the adjusting hole 303, and in order to prevent the driving gear 501 from rubbing against the first support wall 5061 and the second support wall 5062 when rotating, the upper ends of the first support wall 5061 and the second support wall 5062 are respectively provided with an arc surface 5066 matched with the shape of the driving gear 501.

Referring to fig. 5, in an embodiment, the tool mounting seat 101 is provided with a second mounting groove 1011 for mounting the tension housing 506 and a threaded rod receiving groove 1012, the tension housing 506 is clamped in the first mounting groove 1011, and a surface of the first mounting groove 1011 on which the driving gear 501, the driven gear 502 and the threaded rod 503 are mounted faces the inside of the tool mounting seat 101. The end of threaded rod 503 facing away from driven gear 502 extends into threaded rod receiving slot 1012 and is rotatably coupled to the side walls of the receiving slot. Preferably, the tool mounting seat 101 is further provided with a cover 104, and the cover 104 is provided with through holes corresponding to the guide block 102, the first connection hole 103, the threaded rod receiving groove 1012 and the adjustment shaft 505.

Referring to fig. 1, 5, 9 and 15, the bolt 400, the first connection hole 103 and the second connection hole 301 form a set of locking structures, and at least one set of locking structures is required for installing the tool. In one embodiment, the chain saw uses two sets of locking structures when installing the tool, that is, two second connecting holes 301 are provided on the tool protection cover 300, a bolt 400 axially movable along the second connecting hole 301 is respectively installed in each second connecting hole 301, the two bolts 400 are respectively retained in the two second connecting holes 301, and correspondingly, two first connecting holes 103 respectively matched with the second connecting holes 301 are provided on the tool mounting base 101. In this embodiment, the internal structures of the first connection hole 103 and the second connection hole 301 are the same as those of the first connection hole and the second connection hole, and are not described herein again.

Referring to fig. 1, 5, 9 and 15, preferably, two sides of the guide block 102 are respectively provided with a column structure 1021 extending toward the inside of the housing 101 and integrated with the guide block 102, two first connection holes 103 are respectively arranged in the column structures 1021 at two sides of the guide block 102, the tool mounting base 101 is provided with a mounting hole of the guide block 102 and a through hole respectively communicated with the first connection holes 103, the guide block 102 is fixed on the tool mounting base 101 through the mounting hole, and the bolt 400 passes through the through hole and is in threaded connection with the first connection hole 103 to fasten the guide plate 201 between the tool mounting base 101 and the tool protection cover 300. Of course, in other embodiments, the guide block 102 and the first connection hole 103 may be directly formed integrally with the tool mounting base 101.

Other structures of the chain saw of the present invention, which are not described in detail, can be implemented by a conventional structure in the art, and are not described in detail herein. The tool fastening structure of the present invention may also be used in other tools.

The guide plate is fastened between the cutter protection cover and the shell through the bolt which is always kept on the cutter protection cover, when the cutter is replaced, the cutter protection cover is taken down from the shell of the chain saw only by unscrewing the bolt, and the bolt is always kept on the cutter protection cover, so that the bolt can be prevented from being lost; the guide block and the limiting groove are matched to play a role in preliminary positioning on the guide plate of the saw chain, and the contact area of the guide block and the guide plate is large, so that the bearing capacity of the cutter can be improved, and the service life of the cutter is prolonged to a certain extent. Therefore, the utility model effectively overcomes some practical problems in the prior art, thereby having high utilization value and use significance.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the utility model. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (10)

1. A chain saw, comprising:

a housing having a guide block and a first connection hole formed at one side thereof;

the guide plate is provided with a limit groove matched with the guide block;

a saw chain mounted on the guide plate and driven by a driving device disposed in the housing;

the cutter protective cover is provided with a second connecting hole corresponding to the first connecting hole; and

a bolt rotatably and axially movably retained on the tool guard along the second coupling hole, the bolt being threadedly coupled with the first coupling hole through the guide plate to secure the guide plate between the tool guard and the housing.

2. The chain saw according to claim 1, wherein a pressing bushing is arranged in the second connecting hole and is in interference fit with the second connecting hole, and a first matching hole and a second matching hole which are sequentially increased in hole diameter are arranged in the pressing bushing.

3. The chain saw as recited in claim 2, wherein said bolt comprises a stopper portion stopped outside said first fitting hole, a rod portion having one end connected to said stopper portion and the other end extending into said second fitting hole and connected to said threaded portion, and a threaded portion.

4. The chain saw as recited in claim 3, wherein an internal thread is provided in the first connecting hole to engage with the threaded portion.

5. The chain saw of claim 3, wherein the shaft portion is provided with a collar having an outer diameter larger than the first mating hole and smaller than the second mating hole.

6. The chain saw of claim 5, wherein the shaft portion is provided with a collar groove, the collar being snap-fit within the collar groove.

7. The chain saw of claim 5, wherein a distance from the collar to a junction of the first and second mating holes is greater than or equal to a depth of threading of the threaded portion into the first connection hole.

8. The chain saw as recited in claim 2, wherein an end of the pressing bushing toward the first connecting hole is provided with a flange extending radially outward, and an end of the second connecting hole toward the first connecting hole is provided with a groove engaging with the flange.

9. The chain saw of claim 1, wherein the guide block is removably attached to the housing, and wherein the housing defines mounting holes that mate with the guide block.

10. The chain saw as recited in claim 9, wherein both sides of the guide block are provided with a column structure extending toward the inside of the housing, and the first connecting hole is provided on the column structure.

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