CN106180886B

CN106180886B - Portable cutting tool

Info

Publication number: CN106180886B
Application number: CN201510233476.4A
Authority: CN
Inventors: 徐静涛; 闰尚亮
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2015-05-08
Filing date: 2015-05-08
Publication date: 2021-03-16
Anticipated expiration: 2035-05-08
Also published as: CN106180886A

Abstract

The invention discloses a portable cutting tool, which comprises a saw blade, a motor for driving the saw blade, a shell for accommodating the motor, and a bottom plate assembly movably connected to the shell, wherein the bottom plate assembly comprises a bottom plate, a cutting groove is formed in the bottom plate, a depth adjusting device for setting the movement distance of the shell relative to the bottom plate assembly is arranged on the bottom plate, the portable cutting tool also comprises a cutting indicating device linked with the depth adjusting device, and the cutting indicating device is used for indicating the position of at least one of the frontmost end and the rearmost end of the saw blade extending out of the cutting groove when the cutting depth is determined. The user can directly see the position of the saw blade when the saw blade cuts the adjusted depth according to the indication of the cutting indicating device while adjusting the depth, so that the user can accurately and intuitively see the cutting position before cutting, and the user can indicate the position of the saw blade corresponding to the user by adjusting the depth.

Description

Portable cutting tool

Technical Field

The present invention relates to a portable cutting tool, and more particularly to a portable cutting tool including a cutting indicator.

Background

A portable cutting tool generally includes a saw blade for processing a workpiece, a guard for receiving the saw blade, the guard having an opening for allowing the saw blade to pass therethrough, and a depth adjustment mechanism for adjusting a cutting depth of the saw blade, and the portable cutting tool generally further has a cutting indicator.

US6757982B2 discloses a cutting indicator of a portable cutting machine, which comprises a scale arranged on a shield, wherein the scale is arranged to directly correspond to a graduated scale of a depth adjusting device, after a certain depth is adjusted, the depth needs to be recorded, and then the scale corresponding to the depth is found from the cutting indicator, so that the positions of the front end and the rear end of the saw blade exposed out of the shield opening can be obtained. When the cutting indicating device is used, an operator needs to firstly record a preset depth value and then carefully observe the scales to find the scales corresponding to the depth, the operation is complex and not intuitive, and the scales are easy to misread due to the fact that the user needs to observe the scales with naked eyes, so that the cutting position of the saw blade is judged wrongly; in addition, such a cutting indicating device relies on the scale marks when indicating the cutting position, however, the scale marks can only accurately indicate discrete points, and the value between the scales can only be determined by the user visually or by experience, which is easy to generate deviation.

European patent EP0788421B1 discloses a cutting indicator of a portable cutting tool, which comprises an arc line arranged on a main body, the arc line and a saw blade have the same radius, and a vertical line arranged on a shield, the shield can move relative to the main body, when a user operates, after adjusting the depth first, the user presses the main body downwards until the saw blade exposes the shield to cut a workpiece, at the moment, the arc line on the main body intersects with the upper edge line of the shield, the user needs to observe the intersection point of the arc line and the shield, and then the intersection point extends downwards along the vertical line of the shield to the position where the shield contacts with the workpiece, namely the position where the saw blade actually cuts. The cutting indicating device needs an operator to carefully observe the intersection point and extend the intersection point to obtain the cutting position in use, the indication is not intuitive, the intersection point is extended by relying on a vertical line when the cutting position is indicated, however, the distribution of the vertical line is spaced, when the intersection point is positioned at the spaced position, namely, the intersection point is not on the vertical line, the extension of the intersection point only depends on the visual inspection experience of a user, the deviation is easy to generate, and if the vertical line is arranged densely, the defect which is not convenient for the user to observe is generated.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: a portable cutting tool is provided that can visually indicate the cutting position.

The technical scheme of the invention is as follows: a portable cutting tool comprising a saw blade; a motor for driving the saw blade; a housing for housing the motor; the bottom plate assembly is movably connected to the shell and comprises a bottom plate, and a cutting groove is formed in the bottom plate; the depth adjusting device is used for setting the movement distance of the shell relative to the bottom plate component; the method is characterized in that: the portable cutting tool further includes a cut indicating device in linkage with the depth adjustment device for indicating a position of at least one of a forwardmost end and a rearwardmost end of the saw blade protruding from the cutting slot at the determined cutting depth.

The invention has the beneficial effects that: the cutting indicating device linked with the depth adjusting device can accurately indicate the foremost end and the rearmost end of the saw blade extending out of the bottom plate corresponding to any determined depth, when the user adjusts the depth, the position of the saw blade when the saw blade cuts the adjusted depth can be directly seen according to the indication of the cutting indicating device, the user can accurately and intuitively see the cutting position before cutting, the cutting position does not need to be judged through own experience, and the condition of judgment error which is not only convenient but also avoided is avoided. And the user can adjust any depth, and the cutting indicating device can indicate the position of the saw blade corresponding to the cutting indicating device without being influenced by the scales.

Preferably, the cutting indicating device comprises a connecting rod assembly linked with the depth adjusting device and a limiting assembly connected with the connecting rod assembly, the connecting rod assembly comprises an indicating rod, the indicating rod makes linear motion on the plane where the bottom plate is located, and the indicating rod indicates the position of at least one of the frontmost end and the rearmost end of the saw blade extending out of the cutting groove at the determined cutting depth.

Preferably, the connecting rod assembly comprises an adjusting rod fixedly connected with the depth adjusting device, a first connecting rod connected with the adjusting rod and the bottom plate assembly, the indicating rod comprises a first indicating rod connected with the first connecting rod and the bottom plate component, the bottom plate component also comprises a supporting piece fixedly connected with the bottom plate, the limiting component comprises a first limiting groove arranged on the supporting piece, the first connecting rod comprises a first end and a second end, the first end of the first connecting rod is connected with the adjusting rod in a relatively sliding and pivoting way, the first end of the first connecting rod is connected with the first limit groove in a relatively sliding and pivoting way, said first link second end and said support member being slidably and pivotally connected relative to each other, said first indicator lever being pivotally connected to said first link second end, the first indicating lever indicates one of a foremost end and a rearmost end position of the saw blade protruding from the cutting slot at a determined cutting depth.

Preferably, the link assembly further includes a second link connected to the adjustment lever and the base plate assembly, the indication lever further includes a second indication lever connected to the second link and the base plate assembly, the limit assembly further includes a second limit groove disposed on the support, the second link includes a first end and a second end, the first end of the second link and the adjustment lever are relatively slidably and pivotally connected, the second end of the second link and the second limit groove are relatively slidably and pivotally connected, the second end of the second link and the support are relatively slidably and pivotally connected, the second indication lever is pivotally connected to the second end of the second link, and the second indication lever indicates the other of the foremost end and the rearmost end of the saw blade protruding from the cutting groove at the determined cutting depth.

Preferably, the adjusting rod is provided with a first adjusting groove and a second adjusting groove, the first end of the first connecting rod is connected with the first adjusting groove in a relatively sliding and pivoting manner, and the first end of the second connecting rod is connected with the second adjusting groove in a relatively sliding and pivoting manner.

Preferably, the first adjusting groove and the second adjusting groove are parallel to the plane of the bottom plate.

Preferably, the supporting member is provided with a first guide groove and a second guide groove, the second end of the first link is slidably and pivotally connected with the first guide groove, and the second end of the second link is slidably and pivotally connected with the second guide groove.

Preferably, the support member is further provided with a sliding groove, and the adjusting rod is slidably connected to the sliding groove. The adjusting rod is slidably connected to the sliding groove in the protective cover, so that the adjusting rod cannot deviate when lifting along with the depth adjusting device, and the accuracy of the finally indicated cutting position is guaranteed.

Preferably, the bottom plate assembly further comprises a supporting member fixedly connected with the bottom plate, the connecting rod assembly comprises an adjusting rod fixedly connected with the depth adjusting device, and a first connecting rod connected with the adjusting rod and the supporting member, the indicating rod comprises a first indicating rod connected with the first connecting rod and the bottom plate assembly, the limiting assembly comprises a first limiting groove arranged on the adjusting rod, the first indicating rod is connected to the bottom plate in a sliding manner along a plane where the bottom plate is located, the first connecting rod comprises a first end, a second end and a third end pivotally connected to the supporting member, a distance from the second end of the first connecting rod to the third end of the first connecting rod is greater than a distance from the first end of the first connecting rod to the third end of the first connecting rod, the first end of the first connecting rod and the first limiting groove are connected in a sliding and pivoting manner relatively, and the second end of the first connecting rod and the first indicating rod are connected in a sliding and pivoting manner relatively, the first indicating lever indicates one of a foremost end and a rearmost end position of the saw blade protruding from the cutting slot at a determined cutting depth.

Preferably, the link assembly further includes a second link rod connected to the adjusting rod and the support member, the indicating rod further includes a second indicating rod connected to the second link rod and the bottom plate assembly, the limiting assembly further includes a second limiting groove disposed on the adjusting rod, the second indicating rod is slidably connected to the bottom plate along a plane where the bottom plate is located, the second link rod includes a first end, a second end and a third end pivotally connected to the support member, a distance from the second end of the second link rod to the third end of the second link rod is greater than a distance from the first end of the second link rod to the third end of the second link rod, the first end of the second link rod and the second limiting groove are relatively slidably and pivotally connected, the second end of the second link rod and the second indicating rod are relatively slidably and pivotally connected, and the second indicating rod indicates positions of a foremost end and a rearmost end of the saw blade extending from the cutting groove at a determined cutting depth The other of which.

Preferably, a horizontal sliding rail parallel to the plane where the bottom plate is located is arranged on the bottom plate, and the first indication rod and the second indication rod are connected to the horizontal sliding rail in a sliding manner.

Preferably, the first indicating rod is provided with a first vertical slide rail perpendicular to the plane of the base plate, the second end of the first connecting rod is connected with the first vertical slide rail in a relatively sliding and pivoting manner, the second indicating rod is provided with a second vertical slide rail perpendicular to the plane of the base plate, and the second end of the second connecting rod is connected with the second vertical slide rail in a relatively sliding and pivoting manner.

Preferably, the bottom plate assembly further comprises a supporting member fixedly connected with the bottom plate, the limiting member comprises a limiting groove arranged on the supporting member, the connecting rod assembly comprises an adjusting rod fixedly connected with the depth adjusting device, and a first connecting rod connected with the adjusting rod and the bottom plate assembly, the indicating rod comprises a first indicating rod connected with the first connecting rod and the bottom plate assembly, the first indicating rod comprises a first indicating end, the first indicating end abuts against the bottom plate, the connecting rod comprises a first connecting rod, the first connecting rod comprises a first end, a second end and a third end, the first end of the first connecting rod is connected with the adjusting rod through a lower pair, the second end of the first connecting rod is pivotally connected with the first indicating rod, and the third end of the first connecting rod is slidably and pivotally connected with the limiting groove, the first indicating lever indicates one of a foremost end and a rearmost end position of the saw blade protruding from the cutting slot at a determined cutting depth.

Preferably, the indicator lever further comprises a second indicator lever connected to the first link and the base plate assembly, the second indicator lever including a second indicator end abutting against the base plate, the first link second end being pivotally connected to the second indicator lever, the second indicator lever indicating the other of a forwardmost position and a rearwardmost position of the saw blade protruding from the cutting slot at the determined cutting depth.

Preferably, the projection of the motion track of the second end of the first link on the plane where the saw blade is located coincides with the motion track of the center of the saw blade, and the length from the first indicating end to the second end of the first link and the length from the second indicating end to the second end of the first link on the projection of the plane where the saw blade is located are respectively equal to the radius of the saw blade.

Preferably, the projection of the motion track of the third end of the first link on the housing is consistent with the motion track of the projection point of the third end of the first link on the housing.

Preferably, the first end of the first connecting rod is pivotally connected to the adjusting rod, a projection of a motion track of the first end of the first connecting rod on the housing is consistent with a motion track of a projection point of the third end of the first connecting rod on the housing, and the motion track of the second end of the first connecting rod during cutting is consistent with a motion track of a projection point of the second end of the first connecting rod on the housing during cutting.

Preferably, the indication rod comprises an indication end, the indication end being located outside the support. The indicating end positioned outside the protective cover can prevent the protective cover from shielding the indicating end, and a user can observe the position of the indicating end conveniently.

Preferably, the indicator stem comprises an indicator end, which is provided as an arrow or is red-marked or provided with a highlight coating. So set up to make the instruction end more striking, the user of being convenient for observes.

Preferably, the support member is provided with a depth-adjusting groove, the depth-adjusting device comprises a cam wrench located outside the support member, and a pressing plate assembly and a locking member located inside the support member, the cam wrench, the support member, the pressing plate assembly and the locking member can be mutually loosened and pressed, when the cam wrench, the pressing plate assembly and the locking member are loosened, the cam wrench, the pressing plate assembly and the locking member can lift along the depth-adjusting groove, and when the cam wrench, the pressing plate assembly and the locking member are pressed, the positions of the cam wrench, the pressing plate assembly and the locking member relative to.

Preferably, the adjusting rod is fixedly connected to the pressure plate assembly.

Drawings

The same reference numbers and symbols in the drawings and the description are used to indicate the same or equivalent elements.

FIG. 1 is a perspective view of a first embodiment of the cutting tool of the present invention;

FIG. 2 is a schematic view of the internal linkage mechanism of the cutting tool of FIG. 1 in an uncut state;

FIG. 3 is a schematic view of the internal linkage mechanism of the cutting tool of FIG. 1 in a cutting state;

FIG. 4 is a perspective view of the cutting tool of FIG. 1 with the rear housing half concealed;

FIG. 5 is an exploded view of the depth adjustment mechanism of the cutting tool of FIG. 1;

FIG. 6 is a perspective view of the cutting tool of FIG. 1 at a predetermined cutting depth;

FIG. 7 is a front view of an adjustment lever of the cutting tool of FIG. 1;

FIG. 8 is a perspective view of the cutting tool shield body of FIG. 1;

FIG. 9 is a perspective view of an indicator stem of the cutting tool of FIG. 1;

FIG. 10 is a schematic view of the indicator stem of the cutting tool of FIG. 1 in position relative to the shroud cover;

FIG. 11 is an enlarged partial view of the indicator stem of FIG. 10 in position relative to the shroud cover;

fig. 12 is a perspective view of the cutting tool of fig. 1 in another state of a preset cutting depth;

FIG. 13 is a schematic view of the cutting tool of FIG. 1 following a transition from the condition of FIG. 6 to the condition of FIG. 12;

fig. 14 is a perspective view of the second embodiment of the present invention at a preset cutting depth;

fig. 15 is a perspective view of the second embodiment of the present invention in another state of a preset cutting depth;

FIG. 16 is a schematic trace diagram of the second embodiment of the present invention changing from the state of FIG. 14 to the state of FIG. 15;

fig. 17 is a perspective view of a third embodiment of the present invention at a predetermined cutting depth;

fig. 18 is a perspective view of the third embodiment of the present invention in another state of a preset cutting depth;

FIG. 19 is a schematic trace diagram of the third embodiment of the present invention changing from the state of FIG. 17 to the state of FIG. 15;

wherein:

1 cutting tool 11 saw blade 13 housing

15 support 151 shroud body 152 shroud cover

153 deepening groove 154a first guide groove 154b second guide groove

155a first indicating groove 155b and a second indicating groove 156a, b sliding groove

17 bottom plate 171 cutting groove 172 horizontal sliding rail

291c 'first vertical slide 291 d' second vertical slide 19 linkage

191 first rotation axis 192, second rotation axis 193, and third rotation axis

194 fourth axis of rotation 195 first virtual link 196 second virtual link

197 first connecting rod 198 second connecting rod 199 bearing surface

21 depth adjuster 211 cam wrench 212 locking piece

213 platen assembly 214 lock pin 215 stop assembly

216 shim 217 stop surface 218 locking block

219 locking lever 220 locking hole 221 recess

222 through hole 223 rotating shaft hole 224 external cam surface

23 adjust the lever 231a the first adjust groove 231b the second adjust groove

25a, c, e first link 25b, d second link 251a, c, e first link first end

251b, d second link first ends 252a, c, e first link second ends 252b, d second link second ends

253c, e first link third end 253d second link third end 254c first small arc

254d second minor arc 255c first major arc 255d second major arc

27a, c, e first limit groove 27b, d second limit groove 29a, c, e first indication rod

29b, d, f second indicating rod 291a, c first connecting end 291b, d second connecting end

292a, c, e first indication ends 292b, d, f second indication ends 293a, c first extension parts

293b, d second extension 294a first spade 294b second spade

Detailed Description

The specific embodiment of the invention is as follows:

example 1

Referring to FIG. 1, a portable cutting tool 1 includes a saw blade 11, a housing 13, and a floor assembly. The saw blade 11, which is used to cut a workpiece, is mounted on an output shaft 14 extending from the front of the housing 13. The housing 13 houses a motor (not shown) for driving the output shaft 14 to rotate the saw blade 11. The floor assembly is movably connected to the housing 13. The base plate assembly comprises a base plate 17 and a support member 15 fixedly connected to the base plate 17. The bottom plate 17 is provided with a cutting groove for extending the saw blade. In the present embodiment, the saw blade 11 and the output shaft 14 are accommodated in the support 15, the support 15 includes a shield body 151 and a shield cover 152, and the shield body 151 and the shield cover 152 are provided with grooves for the output shaft 14 to move relative to the shield body 151.

Referring to fig. 2 and 3, in the present embodiment, the housing 13 and the bottom plate 17 are connected by a link mechanism 19, but other connection methods such as a pivot connection, a sliding connection, etc. are also possible. The link mechanism 19 includes a first rotary shaft 191 and a second rotary shaft 192 provided on the housing 13, and a third rotary shaft 193 and a fourth rotary shaft 194 provided on the bottom plate 17. The lines connecting the centers of the four rotation axes form a parallelogram. A line connecting the centers of the first and second

rotating shafts

191 and 192 provided on the housing 13 constitutes a first imaginary link 195. A line connecting centers of the third and fourth

rotating shafts

193 and 194 provided on the base plate 17 constitutes a second imaginary link 196. The link mechanism 19 further includes a first connecting rod 197 connecting the first rotation shaft 191 and the third rotation shaft, and a second connecting rod 198 connecting the second rotation shaft 192 and the fourth rotation shaft 194. During cutting, the bottom plate 17 presses against the surface of the workpiece, the housing 13 is pressed downward, the housing 13 drives the saw blade 11 to move downward relative to the shield main body 151 and the bottom plate 17, and the saw blade 11 can extend out of the cutting groove 171 to cut the workpiece.

Referring to fig. 4 to 6, the cutting tool 1 further includes a depth-adjusting device 21 for adjusting the cutting depth. The depth adjustment means 21 is used to set the distance the housing 13 moves relative to the floor assembly. The shield main body 151 is provided with a substantially vertically arranged depth-adjusting groove 153. The depth adjustment device 21 is movably mounted on the shield body 151. The depth adjustment device 21 includes a lock 212 inside the shield body 151, a washer 216 and pressure plate assembly 213, a cam wrench 211 outside the shield body 151, a locking pin 214, and a stop assembly 215. The locking member 212 includes a fixedly connected locking block 218 and a locking rod 219. Of course, the lock block 218 and the lock rod 219 may be integrally formed. The end of the lock rod 219 remote from the lock block 218 has a lock hole 220 through which the lock pin 214 passes transversely. The platen assembly 213 has a recess 221 into which the locking block 218 is inserted, and a through hole 222 through which the locking rod 219 passes is formed in the middle of the recess 221. The cam wrench 211 is provided with a rotation shaft hole 223 through which the locking pin 214 passes and an outer cam surface 224 provided around the rotation shaft hole 223. The locking rod 219 of the locking member 212 passes through the spacer 216 and the through hole 222 of the pressing plate assembly 213, and then extends from the inside of the shield body 151 to the outside of the shield body 151 through the depth-adjusting groove 153. At this time, the locking piece 218 of the locking piece 212 is caught in the recess 221, and the pressing plate assembly 213 abuts against the inside of the shield main body 151 and has a portion protruding from the depth-adjusting groove 153 to be located outside the shield main body 151. The stop assembly 215 is fixedly coupled to the portion of the platen assembly 213 that is outside of the shield body 151. A stop surface 217 is provided on the stop assembly 215. The cam wrench 211 is located outside the shield body 151. The outer cam surface 224 abuts the outer surface of the shield body 151. The locking pin 214 passes through the rotation shaft hole 223 of the cam wrench 211 and the locking hole 220 of the locking piece 212. Cam wrench 211 is rotatable about locking pin 214 between a first position and a second position. When the cam wrench 211 is located at the first position, that is, when the cam wrench 211 is in the loosened state, that is, when the portion of the outer cam surface 224 with the smaller radius abuts against the shield main body 151, there is a gap between the cam wrench 211, the pressing plate assembly 213, and the locking member 212, and the cam wrench 211 can drive the pressing plate assembly 213, the locking member 212, and the stopping member 215 to move up and down along the depth-adjusting groove 153; when the cam wrench 211 is located at the second position, i.e. when the cam wrench 211 is in the locked state, i.e. the portion of the outer cam surface 224 with the larger radius abuts against the shield body 151, the cam wrench 211, the shield body 151, the pressing plate assembly 213 and the locking member 212 are pressed against each other, and the positions of the cam wrench 211, the pressing plate assembly 213, the locking member 212 and the stopping member 215 relative to the shield body 151 are locked and cannot move up and down relative to the shield body 151. When the depth is adjusted, the cam wrench 211 is loosened, and the depth adjusting device 21 is moved up and down to the required depth, and then the cam wrench 211 is locked. At this time, the position of the stopper assembly 215 with respect to the shield body 151 is fixed. The first connecting rod 197 is provided with an abutting surface 199. When the saw blade 11 cuts into the workpiece to a depth adjusted by the depth-adjusting device 21, the abutting surface 199 is just stopped by the stopping surface 217 of the stopping assembly 215, the first connecting rod 197 cannot move further downward, and therefore the saw blade 11 cannot further extend out of the cutting groove 171, and the cutting can be performed at a preset depth.

Referring to fig. 6, the cutting tool 1 further comprises a cutting indication means. The cutting indicating means is linked with the depth-adjusting means 21 for indicating the position of at least one of the frontmost end and the rearmost end of the saw blade 11 protruding from the cutting groove 171 at a certain cutting depth. The cutting indicating device comprises a connecting rod assembly linked with the depth adjusting device 21 and a limiting assembly connected with the connecting rod assembly, wherein the connecting rod assembly comprises an adjusting rod 23 fixedly connected with the depth adjusting device 21, a first connecting rod 25a movably connected with the adjusting rod 23 and the supporting piece 15, and a first indicating rod 29a movably connected with the first connecting rod 25a and the bottom plate 17.

Referring to fig. 6, the adjusting rod 23 is fixedly connected to the depth adjusting device 21, and when the depth adjusting device 21 is adjusting the depth, the adjusting rod 23 will be lifted and lowered synchronously with the depth adjusting device 21. As further shown in fig. 7, the adjustment lever 23 is provided with a first adjustment groove 231 a. Preferably, the first adjustment groove 231a is parallel to the plane of the base plate 17. Preferably, the adjustment rod is designed substantially O-shaped, although other shapes are possible. The adjusting rod 23 is provided with a protrusion connected to the depth adjusting device 21 at one side thereof, the protrusion is fixedly connected to the pressing plate assembly 213 by a screw (not shown), and of course, the adjusting rod 23 may be glued to the pressing plate assembly 213 or integrally formed therewith.

Referring to fig. 6, the first link 25a includes a first end 251a and a second end 252 a. Preferably, the first end 251a and the second end 252a are located at both ends of the first link 25a, respectively.

Referring to fig. 8, the spacing assembly includes a first spacing groove 27a provided on the support member. In the present embodiment, the first stopper groove 27a is provided on the shield main body 151. The shield main body 151 is also provided with a first guide groove 154 a. Preferably, the first guide groove 154a is parallel to the plane of the base plate 17. The first link first end 251a is slidably and pivotally connected with the adjustment lever 23 relative thereto. Preferably, the first link first end 251a is slidably and pivotally connected to the first adjustment groove 231a, and the first link first end 251a is slidably and pivotally connected to the first stopper groove 27 a. The first link second end 252a and the shield body 151 are slidably and pivotally connected with respect to each other. Preferably, the first link second end 252a and the first guide groove 154a are slidably and pivotally coupled with respect to each other. Preferably, the shield main body 151 is further provided with a first sliding slot 156a, and the adjusting rod 23 is slidably connected to the first sliding slot 156 a. The adjusting rod is slidably connected to the upper chute of the shield main body, so that the adjusting rod cannot deviate when lifting along with the depth adjusting device, and the accuracy of the finally indicated cutting position is guaranteed.

Referring to fig. 6, the link assembly further includes a first indicator lever 29 a. The first indicator lever 29a is pivotally connected to the first link second end 252 a. With further reference to FIG. 9, the first indicator lever 29a preferably includes a first link end 291a pivotally coupled to the first link second end 252a, a first indicator end 292a indicating the position of the saw blade 11, and a first extension 293a connecting the first link end 291a and the first indicator end 292 a. The first extension 293a is provided with a first flat part 294 a. Referring to fig. 10 and 11, the shroud cover plate 152 is provided with a first indicating groove 155 a. The first extension portion 293a is slidably engaged in the first indicating groove 155a by the first flat portion 294a and extends from the first indicating groove 155 a. The first indicator lever 29a moves linearly in the plane of the base plate 17. The first indicator end 292a is located on the exterior of the shroud cover plate 152. The indicating end for specifically indicating the position of the saw blade is extended to the outside of the shell through the extending part, so that the shell can be prevented from shielding the indicating end, and a user can conveniently observe the position of the indicating end. More preferably, the first indicating end 292a is provided as an arrow or is red-marked or is provided with a highlight coating. So set up to make the instruction end more striking, the user of being convenient for observes.

Fig. 6 and 12 are schematic views showing the cutting indicating device of the present embodiment in two different cutting depths. Assume that fig. 6 is the first state and fig. 12 is the second state. Wherein the preset depth of the depth-adjusting device 21 in the second state is larger than the depth in the first state. Fig. 13 is a schematic diagram showing the trajectory of the cutting indicator when it changes from the first state to the second state. The state indicated by the solid line is the first state, and the state indicated by the broken line is the second state. When the depth adjusting device 21 is adjusted from the first state to the second state, since the adjusting rod 23 is fixedly connected to the pressing plate assembly 213 of the depth adjusting device 21, the adjusting rod 23 descends along with the depth adjusting device 21, and the first adjusting groove 231a presses the first end 251a of the first connecting rod downward. Since the first end 251a is slidably connected to the first limiting groove 27a of the shield body 151, the first end 251a moves downward along the first limiting groove 27a under the pressure of the first adjusting groove 231a, and the position of the first end 251a is limited by the first limiting groove 27a, i.e., the moving track of the first end 251a relative to the shield body 151 is limited by the first limiting groove 27 a. Since the first link second end 252a is slidably connected to the first guide groove 154a of the shield body 151, the movement of the first link first end 251a causes the first link second end 252a to move in the first guide groove 154a, so that the inclination angle of the first link 25a with respect to the bottom plate 17 becomes smaller. Since the first indicating lever 29a is pivotally connected to the first link second end 252a, the movement of the first link second end 252a carries the first indicating end 292a of the first indicating lever 29a to indicate the position where the saw blade 11 is cutting in the second state. In summary, the first indicating end 292a indicates the foremost or rearmost end of the saw blade 11 protruding from the cutting groove 171 at the determined cutting depth, i.e., the cutting indicating means indicates one of the foremost and rearmost positions of the saw blade 11 protruding from the cutting groove 171 at the determined cutting depth.

The cutting indicating device is linked with the depth adjusting device, the foremost end and the rearmost end of the saw blade extending out of the bottom plate corresponding to any determined depth can be accurately indicated, when a user adjusts the depth, the position of the saw blade when the saw blade cuts to the adjusted depth can be directly seen according to the indication of the cutting indicating device, the user can accurately and intuitively know the cutting position before cutting, the cutting position does not need to be judged through own experience, and the condition of judgment error is convenient and avoided at the same time. And the user can adjust any depth, and the cutting indicating device can indicate the position of the saw blade corresponding to the cutting indicating device.

Referring to fig. 6, in order to indicate the positions of the foremost and rearmost ends of the saw blade 11 protruding from the cutting groove 171 at a certain cutting depth at the same time. Preferably, the link assembly further comprises a second link 25b movably connected to the adjustment lever 23 and the support 15, and a second indication lever 29b pivotally connected to the second link 25 b.

Referring to fig. 6, the second link 25b includes a first end 251b and a second end 252 b. Preferably, the second link first end 251b and the second link second end 251b are located at both ends of the second link 25b, respectively.

Referring to fig. 7, the adjusting lever 23 is preferably further provided with a second adjusting groove 231 b. Preferably, the second adjustment slot 231b is parallel to the plane of the bottom plate 17.

Referring to fig. 8, it is preferable that the stopping assembly further includes a second stopping groove 27b provided on the supporting member. In the present embodiment, the second stopper groove 27b is provided on the shield main body 151. The shield main body 151 is also provided with a second guide groove 154 b. Preferably, the second guide groove 154b is parallel to the plane of the bottom plate 17. The second link first end 251b is slidably and pivotally connected with the adjustment lever 23 relative thereto. Preferably, the second link first end 251b is slidably and pivotally connected with the second adjustment slot 231 b. The second link first end 251b is slidably and pivotally connected with the second limit groove 27 b. The second link second end 252b is slidably and pivotally connected with respect to the shield body 151. Preferably, the second link second end 252b is slidably and pivotally coupled to the second guide slot 154 b. Preferably, the shield main body 151 is further provided with a second sliding slot 156b, and the adjusting rod 23 is slidably connected to the second sliding slot 156 b.

Referring to fig. 6, the second indicator lever 29b is pivotally connected to the second link second end 252 b. With further reference to FIG. 9, the second indicator lever 29b includes a second link end 291b pivotally coupled to the second link second end 252b, a second indicator end 292b indicating the position of the saw blade 11, and a second extension 293b coupling the second link end 291b and the second indicator end 292 b. The second extension 293b is provided with a second flat part 294 b. Referring to fig. 10 and 11, the shroud cover plate 152 is provided with a second indicating groove 155 b. The second extension 293b is slidably engaged in the second indicating groove 155b by the second flat portion 294b and extends from the second indicating groove 155 b. The second indicator lever 29b moves linearly in the plane of the base plate 17. The second indicator end 292b is located on the exterior of the shroud cover plate 152. More preferably, the second indicating end 292b is configured as an arrow or is red-marked or provided with a highlight coating.

Referring to fig. 6, 12 and 13, when the depth adjusting device 21 is adjusted from the first state to the second state, since the adjusting rod 23 is fixedly connected to the pressure plate assembly 213 of the depth adjusting device 21, the adjusting rod 23 descends along with the depth adjusting device 21, and the second adjusting groove 231b presses the second link first end 251b downward. Since the second link first end 251b is slidably connected to the second limit groove 27b of the shield body 151, the second link first end 251b moves downward along the second limit groove 27b under the pressure of the second adjustment groove 231b, and the second limit groove 27b limits the position of the second link first end 251b, that is, the moving track of the second link first end 251b relative to the shield body 151 is limited on the second limit groove 27 b. Since the second link second end 252b is slidably connected to the second guide groove 154b of the shield body 151, the movement of the second link first end 251b causes the second link second end 252b to move in the second guide groove 154b, so that the inclination angle of the second link 25b with respect to the bottom plate 17 becomes smaller. Since the second indicator lever 29b is pivotally connected to the second link second end 252b, movement of the second link second end 252b causes the second indicator end 292b of the second indicator lever 29b to indicate the position at which the saw blade 11 is cutting in the second state. In summary, the second indicating end 292b indicates the foremost or rearmost end of the saw blade 11 protruding from the cutting groove 171 at the determined cutting depth, i.e., the cutting indicating device indicates the other of the foremost and rearmost positions of the saw blade 11 protruding from the cutting groove 171 at the determined cutting depth.

Example 2

The portable cutting tool of this embodiment is substantially the same as the cutting tool of embodiment 1, except for the specific structure of the cutting indicator.

Referring to fig. 14, in a second embodiment of the present invention. The cutting indicating device is also linked with the depth-adjusting device 21 for indicating the position of at least one of the frontmost end and the rearmost end of the saw blade 11 protruding from the cutting groove 171 at a certain cutting depth. The cutting indicating device comprises a connecting rod assembly linked with the depth adjusting device 21 and a limiting assembly connected with the connecting rod assembly, wherein the connecting rod assembly comprises an adjusting rod 23 fixedly connected with the depth adjusting device 21, a first connecting rod 25c movably connected with the adjusting rod 23 and the bottom plate assembly, and a first indicating rod 29c movably connected with the first connecting rod 25c and the bottom plate 17.

Because the adjusting rod 23 is fixedly connected with the depth adjusting device 21, when the depth adjusting device 21 is used for adjusting the depth, the adjusting rod 23 can synchronously lift along with the depth adjusting device. The adjustment lever 23 is substantially C-shaped with its opening facing downward. In this embodiment, the position limiting assembly includes a first position limiting groove 27c provided on the adjustment lever 23. The first stopper groove 27C is provided at one end of the C-shaped adjustment lever 23. The adjusting rod 23 is fixedly connected with the pressure plate assembly 213 of the depth-adjusting device 21 by screws, which may be glued or integrally formed.

The first link 25c includes a first end 251c and a second end 252 c. The first link first end 251c and the first restraint slot 27c are slidably and pivotally connected relative to each other. The first link 25c further includes a third end 253 c. The first link third end 253c is pivotally connected to the shroud cover 152. The first link second end 252c is spaced a greater distance from the first link third end 253c than the first link first end 251c is spaced from the first link third end 253 c.

The bottom plate 17 is provided with a horizontal sliding rail 172 parallel to the plane of the bottom plate 17. The horizontal slide rail 172 is parallel to the plane of the saw blade 11. The first indicator lever 29c is slidably connected to the base plate 17 along the plane of the base plate 17. Preferably, the first indicating rod 29c is slidably connected to the horizontal sliding rail 172 such that the first indicating rod 29c moves linearly in the plane of the bottom plate 17. The first link second end 252c and the first indicator lever 29c are slidably and pivotally connected with respect to each other.

The first indicating rod 29c includes a first connecting end 291c connected to the first rod second end 252c, and preferably, the first connecting end 291c is provided with a first vertical slide 291 c' perpendicular to the plane of the bottom plate 17. The first link second end 252c and the first indicator lever 29c are slidably and pivotally connected with respect to each other. Preferably, the first link second end 252c and the first vertical slide 291 c' are slidably and pivotally connected with respect to each other. The first indicating lever 29c further includes a first indicating end 292c indicating the position of the saw blade 11 and a first extension 293c connecting the first connecting end 291c and the first indicating end 292 c. The first indicator end 292c is located on the exterior of the shroud cover plate 152. The indicating end for specifically indicating the position of the saw blade extends to the outside of the protective cover through the extending part, so that the protective cover can be prevented from shielding the indicating end, and a user can conveniently observe the position of the indicating end. More preferably, the first indicating end 292c is configured as an arrow or is red-marked or provided with a highlight coating. So set up to make the instruction end more striking, the user of being convenient for observes.

Referring to fig. 14, since the first link third end 253c is pivotally connected to the shroud cover 152, the trajectory of the first link first end 251c is constrained to a first small arc 254c about the first link third end 253 c; meanwhile, the first link first end 251c is also located in the first limiting groove 27c, so that the first small arc 254c around the first link third end 253c and the first limiting groove 27c jointly determine the position of the first link first end 251c, i.e., the first link first end 251c is located at the intersection of the first small arc 254c and the first limiting groove 27 c. While the trajectory of the first link second end 252c is constrained to a first large arc 255c about the first link third end 253 c; meanwhile, the first link second end 252c is also located in the first vertical slide 291c ', and thus the first great arc 255c around the first link third end 253c and the first vertical slide 291c ' together determine the position of the first link second end 252c, i.e., the first link second end 252c is located at the position where the first great arc 255c and the first vertical slide 291c ' intersect.

Fig. 14 and 15 are schematic views showing the cutting indicator of the present embodiment in two different cutting depths. Assume that fig. 14 is the first state and fig. 15 is the second state. Wherein the preset depth of the depth-adjusting device 21 in the second state is larger than the depth in the first state. Fig. 16 is a schematic diagram showing the trajectory of the cutting indicator from the first state to the second state. The state indicated by the solid line is the first state, and the state indicated by the broken line is the second state. When the depth adjusting device 21 is adjusted from the first state to the second state, the adjusting rod 23 is fixedly connected with the pressing plate assembly 213 of the depth adjusting device 21, so that the adjusting rod 23 descends along with the depth adjusting device 21, and the first limiting groove 27c descends accordingly. The lowering of the first limit groove 27c pushes the first link first end 251c to move. Since the first link fixing end 253c is pivotally connected to the shield cover 152, the first link 25c is rotated about the first link fixing end 253c by the urging of the first stopper groove 27c, so that the first link second end 252c is rotated about the first link fixing end 253 c. Since the first link second end 252c is slidably connected to the first vertical sliding track 291c ', and since the first vertical sliding track 291 c' is slidably connected to the horizontal sliding track 172, the first link second end 252c drives the first indicating rod 29c to move on the horizontal sliding track 172, so that the first indicating end indicates the cutting position of the saw blade in the second state. In summary, the first indicating end 292c indicates one of the foremost and rearmost positions of the saw blade 11 protruding from the cutting groove 171 at the determined cutting depth, i.e., the cutting indicating means indicates one of the foremost and rearmost positions of the saw blade 11 protruding from the cutting groove 171 at the determined cutting depth.

Referring to fig. 14, in order to indicate the positions of the foremost and rearmost ends of the saw blade 11 protruding from the cutting groove 171 at a certain cutting depth at the same time. Preferably, the link assembly further includes a second link 25d movably connected to the adjustment lever 23 and the base plate assembly, and a second indication lever 29d movably connected to the second link 25d and the base plate 17.

Preferably, the limiting assembly further comprises a second limiting groove 27d disposed on the adjusting rod 23, and the second limiting groove 27d is located at the other end of the C-shaped adjusting rod 23.

The second link 25d includes a first end 251d and a second end 252 d. The second link first end 251d and the second restraint slot 27d are slidably and pivotally connected relative to each other. The second link 25d also includes a third end 253 d. The second link third end 253d is pivotally connected to the shroud cover 152. The second link second end 252d is spaced further from the second link third end 253d than the second link first end 251d is spaced further from the second link third end 253 d.

Preferably, the second indicator bar 29d is slidably connected to the base plate 17 along the plane of the base plate 17. More preferably, the second indicating rod 29d is slidably connected to the horizontal sliding rail 172, so that the second indicating rod 29d can move linearly in the plane of the bottom plate 17. The second link second end 252d and the second indicator lever 29d are slidably and pivotally connected relative to each other.

The second indicating rod 29d includes a second connecting end 291d connected to the second end of the second connecting rod, and preferably, the second connecting end 291d is provided with a second vertical slide 291 d' perpendicular to the plane of the bottom plate 17. The second link second end 252d and the second indicator lever 29d are slidably and pivotally connected relative to each other. Preferably, the second link second end 252d and the second vertical slide 291 d' are slidably and pivotally connected with respect to each other. The second indicator lever 29d also includes a second indicator end 292d that indicates the position of the saw blade 11 and a second extension 293d that connects the second link end 291d and the second indicator end 292 d. Preferably, the second indicator end 292d is located on the exterior of the shroud cover plate 152. More preferably, the second indicating end 292d is configured as an arrow or is red-marked or provided with a highlight coating.

Referring to fig. 14, since the second link third end 253d is pivotally connected to the shroud cover 152, the trajectory of the second link first end 251d is constrained to a second minor arc 254d about the second link third end 253 d; meanwhile, the second link first end 251d is also located in the second limit groove 27d, so that the second small arc 254d around the second link third end 253d and the second limit groove 27d jointly determine the position of the second link first end 251d, i.e., the second link first end 251d is located at the intersection of the second small arc 254d and the second limit groove 27 d. While the trajectory of the second link second end 252d is constrained to a second major arc 255d about the second link third end 253 d; meanwhile, the second link second end 252d is also located in the second vertical slide 291d ', and thus the second great arc 255d around the second link third end 253d and the second vertical slide 291d ' together determine the position of the second link second end 252d, i.e., the second link second end 252d is located at the intersection of the second great arc 255d and the second vertical slide 291d '.

Referring to fig. 14, 15 and 16, when the depth adjusting device 21 is adjusted from the first state to the second state, the adjusting rod 23 is fixedly connected to the pressure plate assembly 213 of the depth adjusting device 21, so that the adjusting rod 23 descends along with the depth adjusting device 21, and the second limiting groove 27d descends accordingly. The descending of the second limit groove 27d pushes the second link first end 251d to move. Since the second link third end 253d is pivotally connected to the hood cover 152, the second link 25d is pushed by the second stopper groove 27d to rotate about the second link third end 253d, so that the second link second end 252d rotates about the second link third end 253 d. Since the second link second end 252d is slidably connected to the second vertical sliding track 291d ' and the second vertical sliding track 291d ' is slidably connected to the horizontal sliding track 172, the second link second end 252d drives the second vertical sliding track 291d ' to move on the horizontal sliding track 172. And since the second indicating rod 29d is connected to the second vertical sliding track 291d ', the second vertical sliding track 291 d' drives the second indicating rod 29d to indicate the position of the saw blade for cutting in the second state. In summary, the second indicating end 292d indicates the other of the foremost and rearmost positions of the saw blade 11 protruding from the cutting groove 171 at the determined cutting depth, i.e., the cutting indicating means indicates the other of the foremost and rearmost positions of the saw blade 11 protruding from the cutting groove 171 at the determined cutting depth.

In this embodiment, the first link third end 253c constrains the trajectory of the first link first end 251c to a first small arc 254c about the first link third end 253c, and the trajectory of the first link second end 252c to a first large arc 255c about the first link third end 253 c. The second link third end 253d constrains the trajectory of the second link first end 251d to a second minor arc 254d about the second link third end 253d and the trajectory of the second link second end 252d to a second major arc 255d about the second link third end 253 d. Therefore, another connection manner of the first link 25c of the present embodiment may be that the first link first end 251c is slidably connected to the sliding slot with the first minor arc 254c as the track disposed on the shield cover plate 152, and the first link second end 252c is slidably connected to the sliding slot with the first major arc 255c as the track disposed on the shield cover plate 152. Another way of connecting the second link 25d may be that the second link first end 251d is slidably connected to a sliding slot with the second small arc 254d as a track, which is arranged on the shield cover plate 152, and the second link second end 252d is slidably connected to a sliding slot with the second large arc 255d as a track, which is arranged on the shield cover plate 152.

Example 3

The portable cutting tool of the present embodiment is substantially the same as the cutting tool of embodiment 1, except for the specific structure of the cutting indication device.

Referring to fig. 17, in a third embodiment of the present invention. The cutting indicating device is also linked with the depth-adjusting device 21 for indicating the position of at least one of the frontmost end and the rearmost end of the saw blade 11 protruding from the cutting groove 171 at a certain cutting depth. The cutting indicating device comprises a connecting rod assembly linked with the depth adjusting device 21 and a limiting assembly connected with the connecting rod assembly, the connecting rod assembly comprises an adjusting rod 23 fixedly connected with the depth adjusting device 21, a first connecting rod 25e pivotally connected with the adjusting rod 23 and movably connected with the bottom plate assembly, and a first indicating rod 29e pivotally connected with the first connecting rod 25 and movably connected with the bottom plate 17.

Because the adjusting rod 23 is fixedly connected with the depth adjusting device 21, when the depth adjusting device 21 is used for adjusting the depth, the adjusting rod 23 can synchronously lift along with the depth adjusting device. The adjusting rod 23 is fixedly connected with the pressure plate assembly 213 of the depth-adjusting device 21 by screws, which may be glued or integrally formed.

The first link 25e includes a first end 251e, a second end 252e, and a third end 253 e. The first link first end 251e is connected to the adjustment lever 23, preferably by a lower pair. The first link second end 252e is pivotally connected to the first indicator lever 29 e. The stop assembly includes a first stop groove 27e provided on the support member. In the present embodiment, the first stopper groove is provided on the shield main body 151. The shield main body 151 is provided with a first stopper groove 27 e. The third end 253e of the first link is slidably and pivotally connected to the first limit groove 27 e.

The first indicator lever 29e includes a first coupling end pivotally coupled to the first link second end 252e, a first indicator end 292e indicating the position of the saw blade 11, and a first extension connecting the first coupling end and the first indicator end 292 e. The first indicating end 292e abuts against the bottom plate 17, so that the first indicating end 292e makes a linear movement in the plane of the bottom plate 17. Preferably, the first indicating end 292e is located on the exterior of the support member to facilitate viewing of the position of the indicating end by a user. More preferably, the first indicating end 292e is configured as an arrow or is red-marked or provided with a highlight coating. So set up to make the instruction end more striking, the user of being convenient for observes.

Fig. 17 and 18 are schematic views showing the cutting indicator of the present embodiment in two different cutting depths. Assume that fig. 17 is the first state and fig. 18 is the second state. Wherein the preset depth of the depth-adjusting device 21 in the second state is larger than the depth in the first state. Fig. 19 is a schematic diagram showing the trajectory of the cutting indicator when it changes from the first state to the second state. The state indicated by the solid line is the first state, and the state indicated by the broken line is the second state. When the depth adjusting device 21 is adjusted from the first state to the second state, since the adjusting rod 23 is fixedly connected to the pressing plate assembly 213 of the depth adjusting device 21, the adjusting rod 23 descends along with the depth adjusting device 21, and the first end 251e of the first link descends accordingly. Since the first link third end 253a is slidably and pivotally coupled to the first stopper groove 27e of the shield body 151, the first link 25e moves downward along the first stopper groove 27a, the position of the first link first end 251e is restricted by the adjustment lever 23, and the position of the first link third end 253a is restricted by the first stopper groove 27a, so that the first link 25e moves downward with respect to the shield body 151. Therefore, the downward movement of the second end 251e of the first link causes the inclination angle of the first indicating rod 29e relative to the bottom plate 17 to become smaller, which brings the first indicating end 292e to indicate the position of the saw blade 11 cutting in the second state. In summary, the first indicating end 292e indicates the foremost or rearmost end of the saw blade 11 protruding from the cutting groove 171 at the determined cutting depth, i.e., the cutting indicating device indicates one of the foremost and rearmost positions of the saw blade 11 protruding from the cutting groove 171 at the determined cutting depth.

Referring to fig. 17, in order to indicate the positions of the foremost and rearmost ends of the saw blade 11 protruding from the cutting groove 171 at a certain cutting depth at the same time. Preferably, the linkage assembly further comprises a second indicator lever 29f pivotally connected to the first link 25 e. The second indicator lever 29f includes a second link end pivotally connected to the first link second end 252e, a second indicator end 292f indicating the position of the saw blade 11, and a second extension connecting the second link end and the second indicator end 292 f. The second indicating end 292f abuts against the bottom plate 17, so that the second indicating end 292f makes a linear movement in the plane of the bottom plate 17. Preferably, the first indicating end 292e is located on the exterior of the support member. More preferably, the first indicating end 292e is configured as an arrow or is red-marked or provided with a highlight coating.

Referring to fig. 17 and 18, similarly, the downward movement of the second end 251e of the first link causes the second indicator bar 29f to tilt less relative to the base 17, thereby bringing the second indicator end 292f to indicate the position of the blade 11 for cutting in the second state. In summary, the second indicating end 292f indicates the other of the foremost and rearmost positions of the saw blade 11 protruding from the cutting groove 171 at the determined cutting depth, i.e., the cutting indicating device indicates the other of the foremost and rearmost positions of the saw blade 11 protruding from the cutting groove 171 at the determined cutting depth.

Preferably, the projection of the second end 252e of the first link onto the plane of the saw blade 11 coincides with the center of the saw blade 11. At this time, the projection of the motion track of the second end 252e of the first link on the plane where the saw blade 11 is located coincides with the motion track of the center of the saw blade 11. The length from the first indicating end 292e to the second end 252e of the first link and the length from the second indicating end 282f to the second end 252e of the first link have a projection length on the plane of the saw blade 11 equal to the radius of the saw blade 11.

More preferably, the projection of the third end 253e of the first link on the housing 13 coincides with the second rotation axis 192. Meanwhile, the projection of the movement locus of the third end 253e of the first link on the housing 13 has a shape coinciding with the movement locus of the second rotation shaft 192.

More preferably, the projection of the first link first end 251e on the housing 13 coincides with the first rotation axis 191. The first link first end 251e is pivotally connected to the adjustment lever 23. Meanwhile, the projection of the movement locus of the first link first end 251e on the housing 13 has a shape coinciding with the movement locus of the first rotation shaft 191.

The present invention is not limited to the above embodiments, and structures based on the inventive concept are within the scope of the present invention.

Claims

1. A portable cutting tool comprising:

a saw blade;

a motor for driving the saw blade;

a housing for housing the motor;

a floor assembly movably connected to the housing; the base plate assembly comprises a base plate; a cutting groove is formed in the bottom plate;

the depth adjusting device is used for setting the movement distance of the shell relative to the bottom plate component;

the method is characterized in that: the portable cutting tool further comprises a cutting indicator in communication with the depth adjustment for indicating a position of at least one of a forwardmost end and a rearwardmost end of the saw blade extending from the cutting slot at the determined cutting depth; the cutting indicating device comprises a connecting rod assembly linked with the depth adjusting device and a limiting assembly connected with the connecting rod assembly, the connecting rod assembly comprises an indicating rod, the indicating rod makes linear motion on the plane where the bottom plate is located, and the indicating rod indicates the position of at least one of the foremost end and the rearmost end of the saw blade extending out of the cutting groove when the cutting depth is determined; the bottom plate assembly further comprises a supporting piece fixedly connected with the bottom plate, the connecting rod assembly comprises an adjusting rod fixedly connected with the depth adjusting device, and a first connecting rod connected with the adjusting rod and the supporting piece, the indicating rod comprises a first indicating rod connected with the first connecting rod and the bottom plate assembly, the limiting assembly comprises a first limiting groove arranged on the adjusting rod, the first indicating rod is connected to the bottom plate in a sliding mode along the plane where the bottom plate is located, the first connecting rod comprises a first end, a second end and a third end pivotally connected to the supporting piece, the distance from the second end of the first connecting rod to the third end of the first connecting rod is larger than the distance from the first end of the first connecting rod to the third end of the first connecting rod, the first end of the first connecting rod is connected with the first limiting groove in a sliding and pivoting mode, and the second end of the first connecting rod is connected with the first indicating rod in a sliding and pivoting mode, the first indicating lever indicates one of a foremost end and a rearmost end position of the saw blade protruding from the cutting slot at a determined cutting depth.

2. The portable cutting tool of claim 1, wherein: the connecting rod assembly further comprises a second connecting rod connected with the adjusting rod and the supporting piece, the indicating rod further comprises a second indicating rod connected with the second connecting rod and the bottom plate assembly, the limiting assembly further comprises a second limiting groove arranged on the adjusting rod, the second indicating rod is connected to the bottom plate in a sliding mode along the plane where the bottom plate is located, the second connecting rod comprises a first end, a second end and a third end connected to the supporting piece in a pivoting mode, the distance from the second end of the second connecting rod to the third end of the second connecting rod is larger than the distance from the first end of the second connecting rod to the third end of the second connecting rod, the first end of the second connecting rod and the second limiting groove are connected in a relative sliding mode and in a pivoting mode, the second end of the second connecting rod and the second indicating rod are connected in a relative sliding mode, and the second indicating rod indicates the other position of the foremost end and the rearmost end of the position, which are extended out of the saw blade from the cutting groove, at the determined cutting One.

3. The portable cutting tool of claim 2, wherein: the bottom plate is provided with a horizontal sliding rail parallel to the plane where the bottom plate is located, and the first indicating rod and the second indicating rod are connected to the horizontal sliding rail in a sliding mode.

4. The portable cutting tool of claim 2, wherein: the first indicating rod is provided with a first vertical sliding rail perpendicular to the plane of the base plate, the second end of the first connecting rod is connected with the first vertical sliding rail in a relatively sliding and pivoting mode, the second indicating rod is provided with a second vertical sliding rail perpendicular to the plane of the base plate, and the second end of the second connecting rod is connected with the second vertical sliding rail in a relatively sliding and pivoting mode.

5. The portable cutting tool of claim 1, wherein: the indicating rod comprises an indicating end, and the indicating end is positioned outside the supporting piece.

6. The portable cutting tool of claim 1, wherein: the indication rod comprises an indication end which is arranged as an arrow or is red marked or is provided with a high-brightness coating.

7. The portable cutting tool of any of claims 1-6, wherein: the support piece is provided with a depth adjusting groove, the depth adjusting device comprises a cam wrench positioned outside the support piece, and a pressing plate assembly and a locking piece positioned inside the support piece, wherein the locking piece penetrates through the pressing plate assembly and the depth adjusting groove and extends to the outside of the support piece and the cam wrench are rotationally connected, the cam wrench can rotate between a first position and a second position, when the cam wrench is positioned at the first position, a gap exists between the cam wrench, the pressing plate assembly and the locking piece and can lift along the depth adjusting groove, when the cam wrench is positioned at the second position, the cam wrench, the pressing plate assembly and the locking piece are mutually compressed, and the position of the relative depth adjusting groove is locked.

8. The portable cutting tool of claim 7, wherein: the adjusting rod is fixedly connected to the pressure plate assembly.