CN105234903B

CN105234903B - Working head

Info

Publication number: CN105234903B
Application number: CN201510690267.2A
Authority: CN
Inventors: 沃伦·布朗; 哈利·索默; 格雷厄姆·格哈德; 霍立祥
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2011-11-11
Filing date: 2011-12-31
Publication date: 2021-08-10
Anticipated expiration: 2031-12-31
Also published as: CN104985571A; CN105234906A; CN105234903A; CN105538240B; CN103101037A; CN105234904A; CN103101037B; CN105234906B; CN104985571B; CN105538240A; CN105215949A

Abstract

The invention discloses a working head which can be arranged on an output shaft of a power tool and is provided with an installation part matched with the output shaft, wherein the installation part is provided with a central hole with a center and a matching surface facing the output shaft, the installation part is provided with a sunken part from the matching surface around the central hole, the sunken part is provided with a bottom surface, the installation part is provided with an internal installation hole from the bottom surface along the direction far away from the matching surface, and the internal installation hole and the sunken part can be respectively matched with the output shafts of the power tool with at least two different types so as to improve the universality of the working head.

Description

Working head

The application is a divisional application of Chinese invention patent application with the invention name of 'work head' and application number of 201110459567.1, applied by the applicant at 12/31/2011.

Technical Field

The present invention relates to a working head, and more particularly to a working head for fitting to an output shaft of a power tool.

Background

The multifunctional machine is a hand-held swing power tool which is common in the industry, and the working principle of the multifunctional machine is that an output shaft does swing motion around the axis of the output shaft. Therefore, after the user installs different working heads on the free end of the output shaft, such as a straight saw blade, a circular saw blade, a triangular sanding disc and a shovel-type scraper, various different operation functions can be realized, such as sawing, cutting, grinding, scraping and the like, so as to adapt to different work requirements.

The working principle of the multifunctional machine is as follows: a motor driver is arranged in the multifunctional tool body, and an eccentric output shaft arranged in a spherical bearing is driven by a shifting fork to do oscillating motion, so that a working element is driven to do oscillating motion, and the processing of a workpiece to be processed is realized. Different working elements have different specialized uses, such as a saw blade for cutting, sandpaper for sanding, etc., wherein a saw blade is a common working element for multi-purpose tools.

At present, several brands of multifunctional tools are available on the market, such as Bosch, Dremel, Fein, Porter-Cable and Worx, each brand of multifunctional tool is provided with a working head of its own brand, but working heads of all brands cannot be commonly used, that is, after a user purchases a certain brand of multifunctional tool, if a user needs to purchase a replaceable working head, the user can only purchase the brand of working head, and working heads of other brands cannot be mounted on the multifunctional tool owned by the user. Therefore, the existing working head has no good universality, which brings trouble to users.

Therefore, there is a need for an improved work head to solve the above problems.

Disclosure of Invention

The invention aims to provide a working head for being mounted on a power tool, which can be matched and connected with output shafts of different types of power tools.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the utility model provides a working head, can install to power tool's output shaft on, this working head be equipped with output shaft complex installation department, the installation department is equipped with centre bore and the orientation that has the center the fitting surface of output shaft, wherein, the installation department centers on the centre bore certainly the fitting surface is formed with the depressed part, the depressed part has the bottom surface, the installation department certainly the bottom surface is along keeping away from the interior mounting hole has been seted up to the direction of fitting surface, the interior mounting hole with the depressed part can with two at least different grade types power tool's output shaft cooperates respectively.

Preferably, the output shaft is provided with a driving portion engaged with the mounting portion, the recess portion includes at least a first side wall and a second side wall engaged with the driving portion, and the recess portion transmits torque to the mounting portion by engagement with the first side wall and the second side wall.

Preferably, the first and second side walls are located on sides of a regular polygon or regular polygon centered on the center of the central aperture.

Preferably, the mounting portion includes a first body and a second body which are stacked, the first body has a supporting surface which supports the second body, a bottom surface of the recess is formed on the supporting surface of the first body, and the first and second side walls are formed on the second body.

Preferably, the mounting portion is provided with an external mounting hole which is located outside the internal mounting hole and penetrates through the first body and the second body, the middle portion of the second body is provided with a middle hole of which the size is larger than that of the central hole, and the external mounting hole located on the second body is communicated with the middle hole.

Preferably, the thickness of the first body and the second body ranges from 0.5 mm to 1 mm.

Preferably, the thickness of the second body is 0.5 to 3 times of the thickness of the first body.

Preferably, the internal mounting aperture comprises at least two protrusions extending outwardly from the central aperture.

Preferably, the mounting portion includes an outer mounting hole including at least two openings distributed on a circumference centered on a center of the central hole and located radially outside the inner mounting hole.

Preferably, the cross-section of the opening is a centrosymmetric pattern, having a center line passing through the center and extending radially.

Preferably, the bore includes an inner section and an outer section arranged radially in series, the inner section being further from the centre than the outer section, the maximum width of the inner section being greater than the maximum width of the outer section in a direction perpendicular to the centre line.

Preferably, the cross-section of the outer section is rectangular, the cross-section of the inner section is a portion of a circle, and the diameter dimension of the inner section is greater than the transverse width of the outer section.

Preferably, the projection of at least one of the inner mounting holes communicates with the opening of one of the outer mounting holes.

Preferably, an included angle between adjacent protrusions of the inner mounting hole relative to the circumferential direction of the center is smaller than or equal to 120 degrees, and an included angle between adjacent openings of the outer mounting hole relative to the circumferential direction of the center is smaller than or equal to 120 degrees

Preferably, the circumferential included angle between adjacent protrusions of the inner mounting hole relative to the center is 45 degrees, and the circumferential included angle between adjacent openings of the outer mounting hole relative to the center is 30 degrees.

Preferably, the inner mounting hole has five protrusions, the outer mounting hole has nine openings, and three protrusions of the inner mounting hole spaced by 90 degrees are radially overlapped with three openings of the outer mounting hole respectively

Preferably, the mounting portion has an outer edge, and a notch is formed in the mounting portion and penetrates from the outer edge to the central hole.

Preferably, the notch is angled at 60 degrees relative to the center of the central bore.

According to the working head, the mounting part is provided with the sunken part, and the bottom surface of the sunken part is provided with the internal mounting hole, so that the sunken part and the internal mounting hole can be respectively matched and connected with output shafts of different types of power tools, the universality of the working head is greatly improved, the trouble of replacing different types of working heads by a user is reduced, and the working head is more convenient for the user to use.

Drawings

Fig. 1 is an assembled view of a working head mounted to a power tool according to a first embodiment of the present invention.

Fig. 2 is a perspective view of the working head shown in fig. 1.

Fig. 3 is a back perspective view of the working head shown in fig. 2.

Fig. 4 is a front view of the working head shown in fig. 2.

Fig. 5 is an exploded perspective view of the working head shown in fig. 2.

Fig. 6 is a perspective view of the output shaft of the first power tool of fig. 1.

Fig. 7 is a schematic view of the working head shown in fig. 2 after being matched with the output shaft shown in fig. 6.

Fig. 8 is a perspective view of the output shaft of the second power tool of fig. 1.

Fig. 9 is a schematic view of the working head shown in fig. 2 after being matched with the output shaft shown in fig. 8.

Fig. 10 is a perspective view of an output shaft of the third power tool of fig. 1.

Fig. 11 is a schematic view of the working head shown in fig. 2 after being matched with the output shaft shown in fig. 10.

Fig. 12 is a perspective view of a fourth output shaft of the power tool of fig. 1.

Fig. 13 is a schematic view of the working head shown in fig. 2 after being matched with the output shaft shown in fig. 12.

Fig. 14 is a perspective view of a fifth output shaft of the power tool of fig. 1.

FIG. 15 is a schematic view of the working head of FIG. 2 mated with the output shaft of FIG. 14.

Fig. 16 is a perspective view of a sixth type of output shaft of the power tool of fig. 1.

FIG. 17 is a schematic view of the working head of FIG. 2 mated with the output shaft of FIG. 16.

Fig. 18 is a perspective view of a seventh output shaft of the power tool of fig. 1.

FIG. 19 is a schematic view of the working head of FIG. 2 mated with the output shaft of FIG. 18.

Fig. 20 is a perspective view of an eighth output shaft of the power tool of fig. 1.

FIG. 21 is a schematic view of the working head of FIG. 2 mated with the output shaft of FIG. 20.

FIG. 22 is a schematic view of the working head of FIG. 2 engaged with the output shaft of FIG. 20 in another direction.

Fig. 23 is a front view of a working head according to a second embodiment of the present invention.

FIG. 24 is an exploded perspective view of the working head of FIG. 23.

Fig. 25 is a perspective view of a working head according to a third embodiment of the present invention.

Fig. 26 is a perspective view of a working head according to a fourth embodiment of the present invention.

The relevant elements in the figures are numbered correspondingly as follows:

100. working head 18, second body 332, convex column

11. Mounting portion 181, central hole 34, driving portion

111. Outer edge 182, rib 341, flange

112. Notch 183, concave 342, convex column

113. Two sides 20, main frame 35, driving part

114. Fitting surface 200 multifunctional machine 351 flange

12. Working part 21, locking part 352 and protrusion part

13. Connecting part 211, bolt 353 and base part

14. Inner mounting hole 212, pressure plate 354, nose

141. Center hole 22, shell 36, drive part

142. Bulge 23, output shaft 361 and flange plate

143. Center 301, flange 362, projection

144. Tip 302, convex column 363, convex tip

15. External mounting hole 303, center 37, driving part

151. Opening 304, center 371, flange

152. Central line 31, driving part 373, mating edge

153. Inner section 311, flange 500, working head

154. External section 312, convex column 51, mounting part

16. Recess 32, driving part 52, first body

161. Bottom 321, flange 520, central hole

162. First side wall 322, convex column 521, internal mounting hole

163. Second side wall 33, driving part 522, external mounting hole

17. First body 331, flange 53, second body

531. External mounting hole 622, second body 700, working head

600. Working head 623, internal mounting hole 71, working part

61. Working part 624, external mounting hole 72 and connecting part

62. Mounting portion 625, recess 73, mounting portion

621. First body 626. center hole

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The invention provides a working head applicable to a swing type power tool (such as a multifunctional machine) or a rotary type grinding power tool (such as a sanding machine). The concave part and the internal mounting hole can be respectively matched and connected with output shafts of different types, so that the working head can be mounted on the output shafts of at least two different types of the power tool, and the universality of the working head is greatly improved.

Referring to fig. 1 and 2, a first embodiment of the present invention discloses a work head 100 mounted on a multifunctional machine 200. In the present embodiment, the working head 100 is a straight saw blade, and it is easy for those skilled in the art to understand that the working head 100 may also be other accessories, such as a circular saw blade, a sand disc, a scraper, etc. The multifunctional machine 200 includes a main body 20 and a locking member 21 for fixing the working head 100 to the main body 20.

The main machine 20 can output a rotationally reciprocating oscillating torque, which includes a housing 22 and an output shaft 23 partially shown in the drawings. The output shaft 23 is longitudinally disposed within the housing 22 with its distal end extending a distance beyond the housing 22. The housing 22 is provided therein with a motor (not shown) and an eccentric transmission mechanism (not shown) connected between a motor shaft of the motor and the output shaft 23, and the motor shaft drives the output shaft 23 through the eccentric transmission mechanism and causes the output shaft 23 to perform a reciprocating oscillating motion in rotation about its own axis X. The eccentric transmission mechanism is a common structure applied to swing power tools in the industry, and is not described in detail herein.

In the present embodiment, when the main body 20 is operated, the output shaft 23 performs a reciprocating oscillating motion around its own axis X at a high frequency of about 5000 to 30000 rotations per minute, and is maintained at a small oscillating angle of about 0.5 to 7 degrees.

The fastener 21 passes through the working head 100 and is connected to the output shaft 23, thereby fixing the working head 100 on a driving part (not shown) at the end of the output shaft 23. The locking member 21 includes a bolt 211 and a pressing plate 212 disposed on the bolt 211. In this embodiment, the pressing plate 212 is an elastic pad, and is relatively fixed to the bolt 211, and is not detachable. After the locking member 21 is tightened, the pressure plate 212 elastically abuts against one side of the working head 100, so that the working head 100 can be prevented from being loosened due to reciprocating or even impact load.

Referring to fig. 2 to 4, the working head 100 is mounted on the driving portion at the end of the output shaft 23, and includes a mounting portion 11 coupled to the output shaft 23, a working portion 12 parallel to the mounting portion 11, and a connecting portion 13 located between the mounting portion 11 and the working portion 12. The free end of the working portion 12 forms a serration, and the other end is connected to the connecting portion 13. The connecting portion 13 extends obliquely so that the mounting portion 11 and the working portion 13 are located in two parallel planes.

In the present embodiment, the mounting portion 11 of the working head 100 specifically includes an inner mounting hole 14, a central hole 141 and an outer mounting hole 15 to mate with different types of driving portions of the output shaft 23. A central bore 141 is centrally disposed in the mounting portion 14 and has a center 143, and the inner mounting bore 14 includes a plurality of projections 142 extending outwardly from the central bore 141.

An outer edge 111 is formed on the side of the mounting portion 11 opposite to the operating portion 12, and a substantially U-shaped notch 112 is further opened on the outer edge 111. The notch 112 faces the saw teeth of the working portion 12 and is communicated with the central hole 141, and has two opposite side edges 113, and an included angle formed by the two side edges 113 is 60 degrees, so that when the mounting portion 11 is matched with the output shaft 23, the side edges 113 can be matched with the driving portion of the output shaft 23 to transmit torque. Obviously, the included angle of the notch 112 may be set to other angles than 60 degrees.

The protrusions 142 of the inner mounting hole 14 are uniformly spaced to enable the working head 100 to be engaged with the output shaft 23 at a plurality of rotation angles. In the present embodiment, the number of the protrusions 142 is five, and the protrusions are uniformly distributed on the mounting portion 11 except for the notch 112, and the interval between the adjacent protrusions 142 is 45 degrees. Three projections 142 spaced by 90 degrees are respectively penetrated through the external mounting hole 15, and the other two projections 142 have arc tips 144.

The outer mounting hole 15 includes a plurality of openings 151, and the openings 151 are uniformly arranged on a circumference centered on the center 143 of the central hole 141. In the present embodiment, since the mounting portion 11 is provided with the notch 112, the number of the holes 151 of the external mounting hole 15 is nine, and the adjacent holes 151 are spaced by 30 degrees. Each aperture 151 has a longitudinal centerline 152 passing through the center 143, the apertures 151 being symmetrically disposed with respect to the centerline 152. The opening 151 includes an inner section 153 and an outer section 154 arranged radially in sequence, the inner section 153 being closer to the center 143 than the outer section 154. In addition, the cross-section of the inner section 153 is rectangular and the cross-section of the outer section 154 is a portion of a circle. The width of the inner segment 153 in a direction perpendicular to the centerline 152 is D1, and correspondingly the width of the outer segment 154 in a direction perpendicular to the centerline 152 is D2, in this embodiment, D2 is greater than D1, so as to match the different shapes of the output shaft 23.

The working head 100 of the present embodiment is provided with a recess 16 in addition to the inner mounting hole 14 and the outer mounting hole 15 for coupling with different types of output shafts 23, and the inner side wall of the recess 16 is formed in a specific shape for coupling with the corresponding type of output shaft 23.

The mounting portion 11 has a mating surface 114 perpendicular to the axis X, and the recessed portion 16 is recessed axially downward from the mating surface 114. The recess 16 is disposed around the center hole 141, and has a bottom surface 161 parallel to the mating surface 114 and a side wall perpendicular to the bottom surface 161. Obviously, the side walls of the recess 16 may not be perpendicular to the bottom surface 161. In this embodiment, the sidewalls are specifically divided into a plurality of groups, each group includes a first sidewall 162 and a second sidewall 163, the first sidewall 162 and the second sidewall 163 are respectively located on the edge of a regular dodecagon with the center 143 as the center, and an included angle of 150 degrees is formed between the first sidewall 162 and the second sidewall 163.

As shown in fig. 5, in the present embodiment, the mounting portion 11 of the working head 100 is formed by stacking the first body 17 and the second body 18, and forms the recess 16. The bottom 161 of the recess 16 is located on the first body 17, and the first side wall 162 and the second side wall 163 of the recess 16 are formed on the second body 18. By providing the mounting portion 11 separately, the working head 100 can be processed more conveniently, and the overall thickness of the mounting portion 11 can be ensured to be small. In the present embodiment, the thickness of the first body 17 and the second body 18 ranges from 0.5 mm to 1 mm, wherein the thickness of the first body 17 is preferably 0.8 mm, and the thickness of the second body 18 is preferably 0.6 mm, as long as the thickness of the second body 18 is 0.5 to 3 times of the thickness of the first body 17. In addition, the mounting portion of the working head of the present invention is not limited to a separate body, and may be integrally formed.

The first body 17 and the second body 18 are both formed by stamping flat plates and are fixed together in a pressure welding mode and cannot be detached. Of course, other means of fastening may be used, such as riveting, bonding, bolting, etc. The first body 17 is integrally formed with a central hole 141, an inner mounting hole 14, an outer mounting hole 15 and a notch 112, wherein the inner mounting hole 14 includes a protrusion 142 extending radially outward from the central hole 141, the outer mounting hole 15 includes nine openings 151 distributed on a circumference centered on the center 143 of the central hole 141, and the three protrusions 142 and the openings 151 located in the cross direction are respectively communicated. The notch 112 is penetrated through the center hole 141 and has two side edges 113.

The second body 18 has a substantially square shape on which the external mounting hole 15 and the notch 112 are integrally formed. The middle part of the second body 18 is provided with a middle hole 181 which is larger than the central hole 141 in size, nine open holes 151 of the external mounting hole 15 are communicated with the middle hole 181, and eight rib parts 182 are formed between the adjacent open holes 151. The side of each rib 182 facing the central hole 181 is formed with the first and

second side walls

162 and 163 of the recess 16 described above, the first and

second side walls

162 and 163 forming a 150 degree acute angle. In addition, two ribs 182 are opposed to the protrusion 142 of the inner mounting hole 14, and arc-shaped recesses 183 matching the tip 144 of the protrusion 142 are respectively formed. During machining, the punched first body 17 and the punched second body 18 are axially superposed, the center 143 of the center hole 141 and the center hole 181 are aligned, the openings 151 of the external mounting holes 15 of the first body 17 and the second body 18 are respectively aligned, and finally, the two are welded together.

The structure and the manufacturing process of the working head 100 are described in detail above, and the working head 100 of the present embodiment can be matched with various types of output shafts 23 due to the structure. The following describes the case where the working head 100 is engaged with different types of driving portions of the output shaft 23, respectively, with reference to fig. 6 to 20.

As shown in fig. 6 and 7, the output shaft 23 of the first multifunction machine 200 has a driving portion 30, and the driving portion 30 has a flange 301 and a plurality of bosses 302 extending axially from the flange 301. The flange 301 is circular in cross-section and has a center 303. The posts 302 are twelve in number and are rectangular in cross-section with a center 304. Centers 304 of twelve posts 302 are evenly distributed on a circle centered at center 303, and thus, adjacent posts 302 are spaced 30 degrees apart.

When the working head 100 is mounted on the output shaft 23, the external mounting hole 15 thereof is engaged with the driving part 30 of the output shaft 23. The boss 302 of the driving part 30 is just received in the opening 151 of the outer mounting hole 15 and is located substantially at the outer section 154 of the opening 151. At this time, through the matching of the convex pillar 302 and the opening 151, the output shaft 23 stably transmits the torque to the working head 100, thereby driving the working head 100 to swing back and forth to realize the actions of cutting and the like. In addition, the working head 100 can be rotatably matched with the driving part 30 of the output shaft 23 between twelve positions to realize multi-angle work.

As shown in fig. 8 and 9, the output shaft 23 of the second multifunction machine 200 has a driving portion 31. Similar to the structure of the driving part 30 shown in fig. 6, the driving part 31 has a circular flange 311 and twelve rectangular posts 312 extending axially from the flange 311. Except that the center of the post 312 is spaced a small distance from the center of the flange 311. Thus, when the working head 100 is engaged with the driving portion 31, the boss 312 is substantially located within the inner section 153 of the opening 151 of the outer mounting hole 15. Likewise, the working heads 100 are rotatably engaged with the driving portions 31 of the output shafts 23 at twelve positions, respectively.

As shown in fig. 10 and 11, the output shaft 23 of the third multifunction machine 200 has a driving portion 32. Similar to the structure of the driving portion 30 shown in fig. 6, the driving portion 32 has a circular flange 321 and a plurality of studs 322 extending axially from the flange 321. The difference is only that the number of the convex columns 322 is eight, the cross section is approximately oval, and the distance from the center of the convex column 322 to the center of the flange 311 is smaller. The convex columns 322 are grouped in pairs, the interval between adjacent groups is 90 degrees, and the interval between two convex columns 322 in each group of convex columns 322 is 30 degrees. Obviously, the working head 100 can be rotatably engaged with the driving portion 32 of the output shaft 23 at eight positions, respectively. When the working head 100 is engaged with the driving portion 32, the protruding pillar 322 is located approximately between the inner section 153 and the outer section 154 of the opening 151 of the outer mounting hole 15.

As shown in fig. 12 and 13, the output shaft 23 of the fourth multifunction machine 200 has a driving portion 33. Similar to the structure of the driving portion 32 shown in fig. 10, the driving portion 33 has a circular flange 331 and a plurality of posts 332 extending axially from the flange 331. Except that there are four of the posts 332 and the cross-section is generally circular. Obviously, the working head 100 can be rotatably engaged with the driving portion 33 of the output shaft 23 at four positions, respectively. When the working head 100 is engaged with the driving portion 33, the protruding post 332 is located approximately between the inner section 153 and the outer section 154 of the opening 151 of the outer mounting hole 15.

As shown in fig. 14 and 15, the output shaft 23 of the fifth multifunction machine 200 has a driving portion 34. Similar to the structure of the driving portion 30 shown in fig. 6, the driving portion 34 has a circular flange 341 and a plurality of posts 342 extending axially from the flange 341. The difference is that the protruding column 342 is disposed on the back of the flange 341, and the protruding column 342 is circular truncated cone-shaped, so that when the working head 100 is mounted, the working head 100 needs to be mounted on the output shaft 23 from one side of the output shaft 23 through the notch 112. Obviously, the working head 100 can be rotatably engaged with the driving portion 34 of the output shaft 23 at twelve positions, respectively. When the working head 100 is engaged with the driving portion 34, the protruding post 342 is substantially located within the inner section 153 of the opening 151 of the outer mounting hole 15. Since the cross-section of the inner section 153 is a portion of a circle, the stud 342 and the inner section 153 of the bore can be tightly fitted, thereby stably transmitting torque.

As shown in fig. 16 and 17, the output shaft 23 of the sixth multifunction machine 200 includes a drive unit 35. Unlike the driving portion described above, the driving portion 35 includes a flange 351 and a projection 352 axially extending from a middle portion of the flange 351. The protrusion 352 includes a cylindrical base 353 and four circular arc-shaped nibs 354 extending radially outward from the base 353, and adjacent nibs 354 are continuously connected with each other at intervals of 90 degrees.

When the working head 100 is engaged with the driving part 35, the center hole 141 and the inner mounting hole 14 are engaged with the projection 352 together. Specifically, the base 353 of the projection 352 mates with the central aperture 141, and the nibs 354 of the projection 352 extend into the corresponding bosses 142 of the interior mounting aperture 14, respectively. By the engagement of the nibs 354 and the protrusions 142, the output shaft 23 transmits torque to the working head 100 through the driving section 35. Since the number of the protrusions 142 is five, the working head 100 can be rotatably engaged with the driving portion 35 of the output shaft 23 at five positions, respectively.

As shown in fig. 18 and 19, the output shaft 23 of the seventh multifunction machine 200 has a driving portion 36. Similar to the structure of the driving portion 35 shown in fig. 16, the driving portion 36 includes a flange 361 and four projections 352 axially extending from a central portion of the flange 351. Adjacent projections 352 are spaced apart by 90 degrees. The projection 362 is generally triangular in cross-section and includes a rounded tip 363 extending radially outward. When the working head 100 is engaged with the driving portion 36, the tips 363 of the protruding portions 362 extend into the corresponding protrusions 142 of the internal mounting hole 14, respectively. Through the cooperation of the protruding tip 363 and the protrusion 142, the output shaft 23 transmits the torque to the working head 100 through the driving part 36. Likewise, the working head 100 is rotatably engaged with the driving portion 36 of the output shaft 23 at five positions, respectively.

As shown in fig. 20 to 22, the output shaft 23 of the eighth multifunction machine 200 has a driving portion 37. The driving portion 37 includes a flange 371 and a projection 362 extending axially from the flange 371, the projection 362 having a cross-section of a regular hexagon with six mating edges 373. After the working head 100 is mounted on the output shaft 23, the protruding portion 362 of the driving portion 37 is just received in the recessed portion 16 of the mounting portion 11, and the engaging edge 373 of the protruding portion 362 can be respectively engaged with the first side wall 162 or the second side wall 163 of the recessed portion 16. Therefore, the working heads 100 can be respectively rotatably engaged with the driving portions 36 of the output shaft 23 at nine positions.

In the present embodiment, the working head 100 is provided with the inner mounting hole 14 and the outer mounting hole 15, and can be engaged with different types of driving portions of the output shaft 23, so as to expand the versatility of the working head 100. In addition, the working head 100 is further provided with a recessed portion 16, and the recessed portion 16 can be matched with the corresponding shape of the driving portion of the output shaft 23, so that the versatility of the working head 100 can be further improved. In addition to providing the recess 16, the working head of the present invention may be further extended in other ways to further expand the versatility of the working head.

It should be noted that the working head of the present invention is not limited to the specific structure of the first embodiment, the working head may not be provided with a notch, and the angle of the interval between adjacent protrusions of the internal mounting hole of the working head may also be any one of 180 degrees, 120 degrees, 90 degrees, 72 degrees, 60 degrees and 30 degrees, and is preferably equal to or less than 120 degrees; the interval angle between adjacent projections of the external mounting hole of the working head can be any one of 180 degrees, 120 degrees, 90 degrees, 72 degrees, 60 degrees and 45 degrees, and is preferably not more than 120 degrees. Obviously, when the working head structure is changed, the shape of the driving part corresponding to the output shaft of the power tool capable of being matched and connected needs to be changed correspondingly.

As shown in fig. 23 and 24, a working head 500 of the present embodiment is basically the same in structure as the working head 100 of the first embodiment, and the working head 500 includes a mounting portion 51, and the mounting portion 51 is formed by stacking a first body 52 and a second body 53. The first body 52 has a structure identical to the first body 17 of the working head 100 of the first embodiment, and is provided with a center hole 520, an inner mounting hole 521 and an outer mounting hole 522. The second body 53 is provided with an external mounting hole 531, which is different from the second body 18 of the first embodiment in that the external mounting hole 531 has a substantially rectangular cross section with a radial width of 2.1 mm. With the working head 500 having such a structure, when the working head is engaged with the driving portion 34 of the output shaft 23 of the fifth multifunctional machine 200 shown in fig. 14 in the first embodiment, since the boss 342 of the driving portion 34 is in a circular truncated cone shape, when the working head is assembled, the boss 342 is axially and sequentially engaged with the external mounting hole 522 of the first body 52 and the external mounting hole 531 of the second body 53, and since the width of the engagement position between the external mounting hole 531 and the boss 342 is narrower than that of the external mounting hole 522, the working head 500 is more tightly and stably engaged with the driving portion 34 of the fifth output shaft 23 as a whole.

In the first and second embodiments, the working head is disclosed as a straight saw blade, however, the working head of the present invention is not limited to a straight saw blade, and may be other accessories such as a circular saw blade, a sanding plate, a scraper, etc., which are easily conceivable to those skilled in the art. Next, a fourth and fifth embodiments of the present invention will be described with reference to fig. 25 and 26, which respectively exemplify a circular saw blade and a sanding plate.

As shown in fig. 25, a third embodiment of the present invention discloses a working head 600 capable of being mounted on a multi-function machine, specifically, a circular saw blade. The working head 600 is substantially fan-shaped, and includes a fan-shaped working portion 61 having an arc of 240 degrees and a mounting portion 62 connected to the working portion 61. The mounting portion 62 has substantially the same structure as the mounting portion 11 of the working head 100 in the first embodiment, and is formed by stacking the first body 621 and the second body 622, and includes an inner mounting hole 623, an outer mounting hole 624, and a recess 625 that can be engaged with driving portions of output shafts of different types of multifunctional machines, which will not be described herein again.

As shown in fig. 26, a fourth embodiment of the present invention discloses a work head 700, specifically a sanding plate, which can be mounted on a multi-function machine. The working head 700 includes a substantially triangular working portion 71, a connecting portion 72 attached to the working portion 71, and a mounting portion 73 attached to the connecting portion 72. The working portion 71 is flat, the connecting portion 72 extends vertically upward from the mating surface of the working portion 71, and the mounting portion 73 is also flat and has the same shape as the mounting portion 11 of the working head 100 in the first embodiment, and will not be described again.

It should be noted that the inner mounting hole and the outer mounting hole provided in the working head of the present invention may be provided in the form of through holes or grooves, as long as the inner mounting hole and the outer mounting hole are ensured to match the cross-sectional shape of the driving portion of the output shaft of the corresponding power tool.

Claims

1. The utility model provides a working head, can install to two kind at least power tool on, two kind at least power tool have different output shafts, wherein be equipped with evenly distributed's twelve projection on one kind of output shaft, this working head include with output shaft complex installation department, be equipped with the centre bore and the outward flange that have the center on the installation department, its characterized in that: the mounting part is also provided with an inner mounting hole, an outer mounting hole and a notch penetrating through the central hole from the outer edge, the inner mounting hole comprises a plurality of bulges extending outwards from the central hole, the outer mounting hole comprises a plurality of open holes distributed on the circumference taking the center as the circle center, and the outer mounting hole is radially positioned outside the inner mounting hole; the breach includes the both sides limit that sets up relatively, connects the limit with two that the both sides limit is connected respectively, the both sides limit is the contained angle setting, and the distance between the both sides limit is suitable for only holding 3 projections in the twelve projections, every connect the limit all include rather than the straight-line section of an adjacent protruding connection, still be equipped with the depressed part on the installation department, the internally mounted hole with the depressed part can with two at least different types power tool's output shaft cooperates respectively, the installation department is including stacking fixed first body and second body mutually, first body has the support the holding surface of second body, the bottom surface of depressed part forms on the holding surface of first body.

2. The work head of claim 1 wherein: the plurality of openings comprise two openings which are symmetrically arranged on two sides of the notch, and the circumferential included angle between the two openings relative to the center is 120 degrees.

3. The work head of claim 1 wherein: the plurality of protrusions include a first protrusion opposite the notch.

4. A work head as claimed in claim 3, wherein: the plurality of holes comprise two holes which are symmetrically arranged, wherein each hole and the connecting line of the center and the central line of the first bulge form an included angle of 30 degrees, and two holes which are symmetrically arranged, wherein each hole and the connecting line of the center and the central line of the first bulge form an included angle of 60 degrees.

5. A work head as claimed in claim 3, wherein: the plurality of holes comprise two holes which are symmetrically arranged on two sides of the notch, and the connecting line of each hole and the center of the two holes and the central line of the first bulge form an included angle of 120 degrees.

6. A work head as claimed in claim 3, wherein: the plurality of bulges further comprise two bulges which are arranged at 90 degrees respectively with the first bulges, the plurality of holes comprise three holes positioned in the cross direction, and the two bulges are communicated with the three holes respectively with the first bulges.

7. A work head as claimed in claim 3, wherein: the plurality of bulges also comprise two bulges, and the included angle between each bulge and the first bulge relative to the circumference direction of the center is 45 degrees.

8. The work head of claim 1 wherein: three bulges positioned in the cross direction in the plurality of bulges are communicated with three openings positioned in the cross direction in the plurality of openings.

9. The work head of claim 1 wherein: the number of the openings is 9, and the openings are adjacent to each other at intervals of 30 degrees.

10. The work head of claim 1 wherein: the notch is U-shaped.