CN103302640A

CN103302640A - Multifunctional machine

Info

Publication number: CN103302640A
Application number: CN2012100615844A
Authority: CN
Inventors: 顾华; 吴海全; 李辉
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Technology (china) Co Ltd
Priority date: 2012-03-09
Filing date: 2012-03-09
Publication date: 2013-09-18
Anticipated expiration: 2032-03-09
Also published as: CN103302640B

Abstract

The invention discloses a multifunctional machine, which comprises an output shaft for mounting a working head and outputting rotary oscillation, and a fastener for arranging the working head on the output shaft. The multifunctional machine also comprises an adaptor, wherein the adaptor is provided with a shape matching part for transmitting the torque on the output shaft to the working head and an adapting part matched with the working head; and the adapting part at least comprises a first adapting part and a second adapting part, so that at least two types of working heads can be quickly and accurately arranged on the output shaft at specific angles through the adaptor.

Description

Multifunctional machine

Technical Field

The invention relates to a multifunctional machine.

Background

The multifunctional machine is a common handheld swing power tool in the industry, and the working principle of the multifunctional machine is that an output shaft performs rotary swing motion around the axis of the output shaft, so that an accessory working head arranged at the tail end of the output shaft is driven to perform swing motion. Common accessory working heads include straight saw blades, circular saw blades, triangular sanding discs, shovel type scrapers, and the like. Therefore, after different accessory working heads are installed on the output shaft, a user can realize various different operation functions, such as sawing, cutting, grinding, scraping and the like, so as to adapt to different working requirements.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: a multi-function machine having an adapter for mounting different types of work heads at a specific angle on an output shaft is provided.

The technical scheme adopted by the invention for solving the technical problems is as follows: a multifunctional machine comprises an output shaft and a fastener, wherein the output shaft is used for mounting a working head and outputting rotary swing, the fastener is used for mounting the working head on the output shaft, the output shaft is provided with a matching surface which is contacted with the surface of the working head, the multifunctional machine also comprises an adapter, the adapter is provided with a shape matching part and a switching part, the shape matching part is used for transmitting torque on the output shaft to the working head, the switching part is matched and connected with the working head, and the switching part at least comprises a first switching part and a second switching part so as to be connected with at least two working heads with connecting holes of different shapes; the multifunctional machine further comprises an elastic element which urges the adaptor to move axially towards the direction of connection with the working head.

Compared with the prior art, the invention has the beneficial effects that: the adapter is provided with a shape matching part for transmitting the torque on the output shaft to the working head and an adapter part matched with the working head, and the shape matching part is matched with the output shaft or the pressing plate, so that the torque transmission is further enhanced; the switching part at least comprises a first switching part and a second switching part so as to connect at least two working heads with connecting holes of different shapes. So that the adaptor can mount at least two different types of working heads on the output shaft quickly, accurately and at a specific angle. And in the process of mounting the working head, the working head cannot move randomly along with the fastening piece.

Preferably, the output shaft is provided with a matching part matched with the shape matching part, and the elastic element is arranged between the output shaft and the adapter.

Preferably, a stop member for stopping the axial disengagement of the adapter is arranged on the output shaft.

Preferably, the fastener comprises a pressing plate which is in contact with the working head, a matching part which is matched with the shape matching part is arranged on the pressing plate, and the elastic element is arranged between the pressing plate and the adapter.

Preferably, the fastening member is provided with a stop ring for stopping the axial disengagement of the adapter.

Preferably, the adapter includes a disc-shaped main body, the shape matching portion is formed by radially extending the outer circumference of the disc-shaped main body outwards, and the first adapting portion and the second adapting portion are formed by axially protruding from one side of the disc-shaped main body.

Preferably, the form-fitting portion comprises at least two form-fitting elements extending radially outwards from the outer circumference of the disc-shaped body.

Preferably, a projection of an outer contour of the disc-shaped body on a plane perpendicular to the output shaft is a polygon.

Preferably, the adapter part at least comprises a first adapter part and a second adapter part which are matched with the connecting holes with different shapes in a shape.

Preferably, the second adapter portion is axially arranged on one side of the first adapter portion, and the radial dimensions of the first adapter portion and the second adapter portion are different.

Preferably, the projection shapes of the first transfer part and the second transfer part on a plane perpendicular to the output shaft are different.

Preferably, at least one of the first transfer part and the second transfer part has an outer contour which is a conical surface or a cylindrical surface.

Preferably, the projection of the outer contour of the first transfer part on a plane perpendicular to the output shaft is a regular polygon, and the second transfer part comprises at least two protrusions extending axially from the first transfer part.

Preferably, the adapter further includes a third adapter portion axially disposed with the first adapter portion and the second adapter portion, and a radial dimension of the third adapter portion is smaller than a radial dimension of the first adapter portion or the second adapter portion.

Preferably, the outer contour of the third adapter part is a conical surface or a cylindrical surface.

Drawings

Fig. 1 is a schematic view of a multi-function machine in a first embodiment of the present invention, with a partial housing removed from a head region.

Fig. 2 is an exploded isometric view of the multi-function nosepiece area of fig. 1.

Fig. 3 is a perspective view of an adapter according to a first embodiment of the present invention.

Fig. 4 is a front view of the adapter in the first embodiment of the present invention.

Fig. 5 is a plan view of the adapter in the first embodiment of the present invention.

Fig. 6 is a schematic view of the adapter of fig. 3 mated with a work head.

Fig. 7 is a schematic cross-sectional view of the multi-function head area of fig. 1, with the working head locked to the output shaft.

FIG. 8 is an exploded perspective view of the multi-function machine of FIG. 1 mounted with a second work head.

Fig. 9 is a schematic view of the adapter of fig. 3 mated with a second work head.

Fig. 10 is a schematic cross-sectional view of the multi-function head area of fig. 8 with a second working head locked to the output shaft.

Fig. 11 is an exploded perspective view of the multi-function machine of fig. 1 mounted with a third working head.

Fig. 12 is a schematic cross-sectional view of the multi-function head area of fig. 11, with a third working head locked to the output shaft.

Fig. 13 is an exploded perspective view of a head region of a multi-function machine in a second embodiment of the present invention.

Fig. 14 is an exploded perspective view of the head region of the multi-function machine in a second embodiment of the invention, with the adapter and fastener installed together.

Fig. 15 is a schematic cross-sectional view of the multi-function head area of fig. 13, with the first work head locked to the output shaft.

Fig. 16 is a schematic sectional view of a head region of a multi-function machine in a third embodiment of the present invention, when a first working head is not mounted on an output shaft.

Fig. 17 is a schematic sectional view of a head region of a multi-function machine in a third embodiment of the present invention, when a first working head is mounted on an output shaft.

Wherein,

32. output shaft 34, working head 36, fastener

38. Shifting fork 42, pressure plate 44 and rod part

46. Connecting part 48, threaded part 52, mounting part

54. Cutting part 56, connecting hole 58, connecting flange

60. Mating surface 62. adapter 63. conical spring

64. Centre hole 65, rand 66, switching dish

67. Clamping groove 68, disc-shaped main body 70, shape matching part

72. First transition 73, side wall 74, second transition

76. Form fitting element 75, end wall 77, recess

78. Recess 79, step 80, locking member

81. Third adapter 82, drive mechanism 84, through-hole

86. Push rod 88, operating piece 90, pivot

92. Groove 94, cam portion 96, handle

98. Contact surface 100, another working head 101, round table

102. Bump 103, top surface 104, mounting portion

106. Cutting part 108, connecting hole 110 and projection

112. Curve section 114, another working head 116, mounting section

118. Cutting part 120, connecting hole 122 and clamping ring

124. Recess 126, blind threaded hole 128, fastener

130. Pressing plate 132. screw thread part

Detailed Description

The invention is further described with reference to the following detailed description and accompanying drawings.

Fig. 1 shows a head region in a first embodiment of the multi-function machine of the present invention. The multifunctional machine includes a housing 30, a motor (not shown) mounted in the housing 30, an output shaft 32 driven by the motor, and a working head 34 mounted below the output shaft 32. A fastener 36 is connected to the end of the output shaft 32 after passing through the working head 34, so that the working head 34 is fixed on the output shaft 32 and can move under the driving of the output shaft 32.

The output shaft 32 is longitudinally disposed within the housing 30 with its distal end extending a distance beyond the housing 32. A shifting fork 38 is mounted on the output shaft 32, and when the motor rotates, an eccentric transmission mechanism (not shown) is driven to rotate, and the eccentric transmission mechanism further drives the shifting fork 38 to realize rotary swing, so that the output shaft 32 performs rotary swing motion. The eccentric transmission mechanism is a common structure applied to a multifunctional machine in the industry, and is not described in detail herein.

Referring to fig. 1 and 2, the fastener 36 includes an annular pressure plate 42 and a shank 44 extending axially from a central portion of the pressure plate 42. In this embodiment, the stem portion 44 includes a connecting portion 46 connected to the pressure plate 42 and a threaded portion 48 connected thereto.

The working head 34 is a straight saw blade, and it will be readily apparent to those skilled in the art that the working head 34 may be other accessories, such as a circular saw blade, a sanding disc, a scraper, etc. The working head 34 is made of metal and includes a mounting portion 52 and a cutting portion 54 bent and extended from the mounting portion 52, the mounting portion 52 is provided with a connecting hole 56 for the fastening member 36 to pass through, and the connecting hole 56 is regular dodecagon. Of course, the connection hole 56 may have any shape such as other regular polygon, or circle.

The end of the output shaft 32 is provided with a connecting flange 58. The attachment flange 58 is provided with a mating surface 60 that contacts the upper surface of the working head 34. When the working head 34 is fixed on the output shaft 32, the upper and lower surfaces of the working head 34 are respectively attached between the pressing plate 42 and the mating surface 60. Here, the friction force generated by the engagement surface 60 and the upper surface of the working head 34 is large enough to transmit the swing torque of the output shaft 32 to the working head 34 without causing the working head 34 to slip during the operation of the multifunctional machine. And the attachment hole 44 of the working head 34 may have any other shape regardless of the shape of the attachment hole itself of the working head 34 since it is closely fitted to the upper surface of the mounting portion 52 of the working head 34 through the engagement surface 60. Therefore, by providing the output shaft 32 with the fitting surface 60, the multifunctional machine can be connected with different types of working heads, and the versatility and convenience of the multifunctional machine are greatly improved.

In the present embodiment, the mating surface 60 is a friction surface formed by a plurality of regularly arranged ribs. Of course, the matching surface can also be in other shapes, such as a smooth surface, or formed by a plurality of mandrels which are regularly arranged, or a coating layer containing a friction material; or directly grinding the rough friction surface.

The multi-function machine is enabled to connect different types of working heads by the mating surface 60 on the output shaft 32, and the working heads can be mounted on the output shaft 32 at any angle. However, it also brings troubles such as the inability to quickly and accurately adjust the angle of the various working heads with respect to the output shaft 32 at the time of installation.

Thus, referring to FIG. 2, the multi-function machine further includes an adapter 62, the adapter 62 being capable of mounting different types of work heads on the output shaft 32 quickly, accurately and at a specific angle. In the embodiment, the adaptor 62 is disposed on the output shaft 32 and can transmit the torque on the output shaft 32 to the working head 34, so as to further enhance the transmission of the torque and prevent the working head 34 from slipping. Between the output shaft 32 and the adapter 62, there is provided an elastic member whose elastic force urges the adapter 62 to axially move always in a direction of contacting the working head 34. Here, the elastic member is a conical spring 63, and the conical spring 63 occupies a relatively small space when compressed. It will be appreciated that the resilient member may also be a compression spring or the like. A stopper for stopping the release of the adapter 62 is provided on the output shaft 32. Here, the stopper is a collar 65 having an opening, and a catching groove 67 is provided on the output shaft 32. The retainer ring 65 is received in the pocket 67 to prevent the stop adapter 62 from disengaging the output shaft 32 when the working head 34 is not installed.

Referring to fig. 2-5, adapter 62 has a central bore 64 through which fastener 36 passes and an adapter plate 66. In this embodiment, the central bore 64 is generally square in cross-section and mates with the connecting portion 46. The adaptor disc 66 is provided with a first end portion facing the output shaft 32 and having a disc-shaped body 68 and a second end portion facing the working head 34, which are oppositely disposed.

In order to better transmit the torque and mount the working head 34 on the output shaft 32 at a specific angle, the adapter 62 includes a shape-matching portion 70 and an adapter portion matching with the working head 34. The adapter part at least comprises a first adapter part 72 and a second adapter part 74, and the projection shapes of the first adapter part 72 and the second adapter part 74 on a plane perpendicular to the output shaft 32 are different, so that the adapter part is used for connecting at least two working heads with connecting holes of different shapes. Moreover, the thickness of the two adapter parts is more than 1.2 mm, preferably 1.2 mm, so that the corresponding working heads can be more stably installed.

The shaped portion 70 is formed by extending the outer circumference of the disc-shaped body 68 radially outward, and the first transition portion 72 and the second transition portion 74 are formed by projecting axially from one side of the disc-shaped body 68.

The form fitting 70 includes at least one form fitting element 76 extending radially outwardly from the outer circumference of the disc-shaped body 68. In the present embodiment, the shaped fitting 70 comprises four circumferentially uniformly arranged shaped fitting elements 76, and each shaped fitting element 76 comprises two opposite parallel side walls 73 with respect to the center of the disc-shaped body 68 and an end wall 75 connecting the side walls 73. Preferably, the end walls 75 are perpendicular to the side walls 73. And for the convenience of assembly, the two side walls 73 of the form-fitting element 76 are in rounded transition with the outer circumference of the disc-shaped body 68; the two side walls 73 and the end wall 75 of the form-fitting element 76 also merge by means of rounded corners. The output shaft 32 is provided with a recess 77 for at least partially receiving the adapter 62, and an engaging portion having a shape matching the shape of the engaging member 76 is formed on an inner wall of the recess 77. In a particular embodiment, the outer profile of the mating portion is the same shape as the outer profile of the form fitting portion 70. The mating portion includes a groove 78 that mates with the form fitting element 76. Obviously, the outer contour of the form-fitting element 76 may also have other shapes, and may at least comprise an arc or a polygon, etc.

Of course, when the projection of the outer contour of the disk-shaped body 68 on a plane perpendicular to the output shaft 32 is a polygon, such as a regular dodecagon, the fitting is directly formed on the disk-shaped body 68. In this way, a fitting portion matching the outer contour of the disc-shaped body 68 is also formed at the inner wall of the recess 77. Obviously, the outer contour shape of the disk-shaped body 68 may also be other shapes, such as polygonal, etc.

In this embodiment, the adapter 62 is stepped, extending axially from the surface of the disc-shaped body 68 a step 79, the step 79 being a cylindrical step having a radial dimension smaller than that of the disc-shaped body 68. The step 79 is thicker than the collar 65 and the collar 65 sits on the cylindrical surface of the step 79 and contacts the surface of the disc-like body 68 when the adaptor 62 is mounted on the output shaft 32.

The first adapter portion 72 and the second adapter portion 74 are formed by axially protruding from the end surface of the step 79 in sequence. And the maximum radial dimension of the first transition portion 72 may be equal to or greater than the maximum radial dimension of the second transition portion 74.

The transition portion further comprises a third transition portion 81 arranged axially with respect to the first transition portion 72 and the second transition portion 74. The third transition portion 81 extends axially from the second transition portion 74 and has a maximum radial dimension that is less than the maximum radial dimension of the second transition portion 74.

As shown in fig. 2, 5 and 6, in the present embodiment, the cross section of the first transfer portion 72 on the plane perpendicular to the output shaft 32 is a regular hexagon and is matched with the connection hole 56 of the working head 34. When the working head 34 is mounted to the adapter 62, the attachment holes 56 are received and mated with the first adapter portion 72 of the adapter 62 to radially position the working head 34. In this way, the adapter 62 can transmit the torque on the output shaft 32 to the working head 34 and also fix the angle of the working head 34 relative to the output shaft 32. Obviously, the cross-section of the first connection portion 72 may also have other shapes, such as a dodecagon shape matching the dodecagon-shaped working head 34. Of course, the first transition portion 72 has a regular hexagonal cross-section, which allows six fixed positions of the working head 34 relative to the output shaft 32.

Further, in this embodiment, in order to allow quick mounting or dismounting of the working head and to provide a stronger axial pressing force, the multifunctional machine is provided with a locking member 80 cooperating with the fastening member 36 and a driving mechanism 82 rotatable about the axis X of the output shaft 32, see fig. 7. The locking member 80 and the fastener 36 can be driven to be threadedly locked when the driving mechanism 82 is rotated in one direction; the drive mechanism 82 is then rotated in the opposite direction to drive the lock 80 and fastener 36 to release. Of course, the fastener 36 may also be directly threadedly coupled to the output shaft 32 to secure the working head 34 to the output shaft 32, as will be described in detail in later embodiments.

The retaining member 80 is received in the cavity of the output shaft 32. The locking member 80 is substantially annular and can rotate freely in the cavity without axial displacement, and a threaded hole connected with the threaded portion of the fastening member 36 is axially formed in the middle of the locking member. The coupling portion 46 of the fastener 36 is generally square in cross-section and the output shaft 32 is provided with a through hole 84 that receives the coupling portion 46. The through bore 84 is also generally square in cross-section such that the fastener 36 cannot rotate relative to the output shaft 32 when the coupling portion 46 is disposed through the through bore 84.

The driving mechanism 82 includes a push rod 86 for engaging the lock member 80 and driving the lock member 80 to rotate, and an operating member 88 for operating the movement of the push rod 86. The push rod 86 has a pivot 90 mounted at the top and a recess 92 axially formed at the bottom. Wherein the axis of the pivot 90 is perpendicular to the axis X of the output shaft 32. The groove 92 is fitted over the outer circumference of the locking member 80 and drives the locking member 80 to rotate by means of an engaging means. The operating member 88 is pivotally connected to the top end of the push rod 86 by a pivot 90. On one side relative to the pivot 90, a cam portion 94 is provided and on the other side, a handle 96 extends generally perpendicular to the cam portion 94. Wherein when the handle 96 is rotated about the axis of the pivot 90, the cam portion 94 contacts the contact surface 98 of the housing, thereby causing the push rod 86 to move up and down.

Referring to fig. 6 and 7, when the working head 34 is mounted on the multifunctional machine, the working head 34 is sleeved on the adapter 62, so that the connecting hole 56 is sleeved on the first adapter 72 of the adapter 62 and is tightly fitted to the first adapter, thereby radially positioning the working head 34; handle 96 is then operated to rotate about the axis of pivot 90, cam portion 94 contacts contact surface 98 of the housing, which in turn moves pushrod 86 downward so that recess 92 of pushrod 86 engages locking member 80; the operating handle 96 is then rotated about the axis X of the output shaft 32 in a tightening direction to rotate the retaining member 80 together to threadably lock the retaining member 80 to the fastener 36, at which point the conical spring 63 is compressed and the pressure plate 42 axially compresses the lower surface of the mounting portion 52 of the working head 34 until the mounting portion 52 of the working head 34 is secured between the mating surface 60 and the pressure plate 42, thereby axially securing the working head 34. During installation, the working head 34 does not move arbitrarily because the first transfer portion 72 and the connection hole 56 are matched with each other.

It is to be understood that the drive mechanism in the present invention is not limited to the structure adopted in the above-described embodiment.

The second adaptor portion 74 and the first adaptor portion 72 of the adaptor 62 have different shapes, and can be connected with at least two working heads with different connecting holes. The following describes the matching of the adaptor 62 and another working head 100 in this embodiment with reference to fig. 3 to 5 and fig. 8 to 10.

As shown in fig. 3 to 5, the second adaptor portion 74 is provided on one axial side of the first adaptor portion 72. The second transition portion 74 includes eight bosses 102 extending axially from the first transition portion 72. The bosses 102 extend radially from the central circular truncated cone 101, and each boss 102 is independent and circumferentially and uniformly arranged. The boss 102 has a top surface 103, and the top surface 103 is in a circular arc transition with the top surface of the first transition portion 72.

As shown in fig. 8 to 10, the working head 100 has a similar shape to the working head 34, and also has a mounting portion 104 and a cutting portion 106 bent and extended from the mounting portion 104, and the mounting portion 104 is provided with a connecting hole 108. Except that the attachment hole 108 is shaped differently from the attachment hole 56 of the working head 34. The connection holes 108 are star-shaped and mate with the second transition portion 74 of the adapter 62. The connecting hole 108 includes eight radially extending circular protrusions 110, and adjacent protrusions 110 are continuously connected by a curved section 112 toward a center line of the connecting hole 108.

When the multifunctional machine is provided with the working head 100, firstly, the working head 100 is sleeved on the adapter 62, and the connecting hole 108 is sleeved on the second adapter part 74 of the adapter 62, that is, the circular protrusion 110 is tightly matched with the boss 102, so that the working head 100 is positioned in the radial direction; handle 96 is then operated to rotate about the axis of pivot 90, cam portion 94 contacts contact surface 98 of the housing, which in turn moves pushrod 86 downward so that recess 92 of pushrod 86 engages locking member 80; at this time, the operating handle 96 is rotated in the screwing direction about the axis X of the output shaft 32, so that the locking member 80 is rotated together to screw-lock the locking member 80 and the fastening member 36, and at this time, the tapered spring 63 is compressed, and the pressing plate 42 axially presses the lower surface of the mounting portion 104 of the working head 100 until the mounting portion 104 of the working head 100 is fixed between the mating surface 60 and the pressing plate 42, thereby axially fixing the working head 100. During the installation process, the working head 34 will not move arbitrarily because the second adaptor portion 74 and the connection hole 108 are matched with each other.

The third mounting portion 81 of the adapter 62 is shaped differently from the first and

second adapter portions

72 and 74 so that other types of work heads can be attached. The following describes the fitting of the adaptor 62 to another working head 114 in the present embodiment with reference to fig. 11 and 12.

As shown in fig. 11 and 12, the outer contour of the third mounting portion 81 of the adaptor 62 includes at least a conical surface.

The working head 114 has a similar shape to the working head 34, and also has a mounting portion 116 and a cutting portion 118 bent and extended from the mounting portion 116, and the mounting portion 116 is provided with a connecting hole 120. Except that the connection hole 120 is shaped differently from the connection hole 56 of the working head 34. The connection hole 120 is circular and matches with the conical surface of the third mounting portion 81.

When the multifunctional machine is provided with the working head 114, firstly, the working head 114 is sleeved on the adapter 62, so that the connecting hole 120 is sleeved on the third mounting part 81 of the adapter 62, and the working head 100 is positioned in the radial direction; handle 96 is then operated to rotate about the axis of pivot 90, cam portion 94 contacts contact surface 98 of the housing, which in turn moves pushrod 86 downward so that recess 92 of pushrod 86 engages locking member 80; at this time, the operating handle 96 is rotated about the axis X of the output shaft 32 in the tightening direction, thereby rotating the locking member 80 together to screw-lock the locking member 80 and the fastening member 36, and at this time, the tapered spring 63 is compressed, and the pressing plate 42 axially presses the lower surface of the mounting portion 116 of the working head 128 until the mounting portion 116 of the working head 128 is fixed between the mating surface 60 and the pressing plate 42, thereby axially fixing the working head 128.

The adapter is provided with the first and second adapter parts and even the third mounting part to connect various working heads, so that the torque on the output shaft 32 can be further transmitted to different types of working heads, and the working heads can be quickly and accurately mounted on the output shaft 32 at a specific angle.

It should be noted that the adapter of the present invention is not limited to having only the first, second and third mounting portions, and those skilled in the art will readily appreciate that more mounting portions, such as fourth, fifth mounting portions, etc., may be provided so that a greater variety of working heads having different attachment holes may be attached. The shapes of the first and second transferring portions are not limited to the shapes defined in the first embodiment, and the outer contour may be a conical surface, a cylindrical surface, or the like, or the first transferring portion may be another polygon, a polygon, or the like, and the second transferring portion projections are not limited to eight, as long as more than two projections are provided, and the specific shape of the projections may be another shape such as a cylinder, or the like. Of course, the outer contour of the third mounting portion is not limited to a conical surface, and may be a cylindrical surface or other shaped projections.

Referring to fig. 13 to 15, an adaptor 62 according to a second embodiment of the present invention is substantially the same as the adaptor 62 according to the first embodiment, except that the adaptor 62 is disposed. In the second embodiment, the adapter 62 is provided on the platen 42. Therefore, the conical spring 63 is disposed between the pressure plate 42 and the adaptor 62, and the elastic force of the conical spring 63 urges the adaptor 62 to axially move toward the direction of contact with the working head 34 at all times. A stop ring is provided on the pressure plate 42 to stop the adapter 62 from disengaging. Here, the stop ring is a collar 122 with an opening, on the connecting portion 46 a catch groove is provided. The collar 122 is received in the slot to prevent the adapter 62 from disengaging the pressure plate 42.

Thus, the adaptor 62 of this embodiment may also be used with the fastener 36 to form a stand-alone fastening device that may be used to mount multiple work heads to a multi-function machine. As a separate component, the fastening device may facilitate assembly of the multi-function machine. Of course, the fastening device may also be sold as a separate accessory.

As in the first embodiment, the form fitting 70 comprises four evenly arranged form fitting elements 76. In the second embodiment, the pressure plate 42 has a matching portion which matches the shape of the form-fitting element 76. In this embodiment, the mating portion is the same shape as the form-fitting portion 70, being a recess 124 that mates with the form-fitting element 76. In this manner, the adapter 62 is form-fit to the pressure plate 42 so that torque on the output shaft 32 can be transmitted to the working head 34.

The following describes the engagement between the working head 34 and the first adaptor portion 72 of the adaptor 62 in the present embodiment with reference to fig. 13 to 15. The matching between the other adapter parts of the adapter 62 and the different types of working pairs is the same as that of the first embodiment, and thus the description thereof is omitted here.

When the multifunctional machine is used for mounting the working head 34, firstly, the working head 34 is sleeved on the adapter 62, so that the connecting hole 56 of the multifunctional machine is sleeved on the first adapter part 72 of the adapter 62 and is tightly matched with the first adapter part, and the working head 34 is positioned in the radial direction; handle 96 is then operated to rotate about the axis of pivot 90, cam portion 94 contacts contact surface 98 of the housing, which in turn moves pushrod 86 downward so that recess 92 of pushrod 86 engages locking member 80; the operating handle 96 is then rotated about the axis X of the output shaft 32 in a tightening direction to rotate the retaining member 80 together to threadably lock the retaining member 80 to the fastener 36, at which point the conical spring 63 is compressed and the pressure plate 42 axially compresses the lower surface of the mounting portion 52 of the working head 34 until the mounting portion 52 of the working head 34 is secured between the mating surface 60 and the pressure plate 42, thereby axially securing the working head 34. During installation, the working head 34 does not move arbitrarily because the first transfer portion 72 and the connection hole 56 are matched with each other.

Referring to fig. 16 and 17, an adapter 62 according to a third embodiment of the present invention is substantially the same as the adapter 62 of the second embodiment, except that a blind threaded bore 126 is provided directly in the output shaft 32, and a fastener 128 includes a pressure plate 130 and a cylindrical threaded portion 132 extending axially from a central portion of the pressure plate 130. When the working head 34 is installed, firstly, the working head 34 is sleeved on the adapter 62, so that the connecting hole 56 of the working head is sleeved on the first adapter part 72 of the adapter 62 and is tightly matched with the first adapter part, and the working head 34 is positioned in the radial direction; the fastener 128 with the working head 34 mounted thereto is then attached to the output shaft 32; the working head 34 can be easily secured between the mating surface 60 and the pressure plate 130 by simply engaging the threaded portion 132 of the fastener 128 with the blind threaded bore 126 and rotating the fastener 128 in the tightening direction, thereby axially securing the working head 34. During installation, the working head 34 does not move arbitrarily because the first transfer portion 72 and the connection hole 56 are matched with each other.

It will be appreciated that the working head 34 may be secured to the output shaft 32 with fasteners 128 as in the first embodiment where the adapter 62 is mounted to the output shaft 32. Similarly, the embodiment only illustrates the matching situation of the first adapter portion 72 and the working head 34, and the matching situation of other adapter portions of the adapter 62 and other different types of working pairs is the same as that of the first embodiment, which is not repeated herein.

Claims

1. A multifunctional machine comprises an output shaft and a fastener, wherein the output shaft is used for mounting a working head and outputting rotary swing, the fastener is used for mounting the working head on the output shaft, and the output shaft is provided with a matching surface which is contacted with the working head, and the multifunctional machine is characterized in that: the multifunctional machine also comprises an adapter, wherein the adapter is provided with a shape matching part for transmitting the torque on the output shaft to the working heads and a switching part matched and connected with at least two working heads with connecting holes of different shapes, and the switching part at least comprises a first switching part and a second switching part matched and connected with the connecting holes of different shapes; the multifunctional machine further comprises an elastic element which urges the adaptor to move axially towards the direction of connection with the working head.

2. The multi-function machine of claim 1, wherein: the output shaft is provided with a matching part matched with the shape matching part, and the elastic element is arranged between the output shaft and the adapter.

3. The multi-function machine of claim 2, wherein: and a stop piece for stopping the axial disengagement of the adapter is arranged on the output shaft.

4. The multi-function machine of claim 1, wherein: the fastener comprises a pressing plate which is contacted with the working head, a matching part which is matched with the shape matching part is arranged on the pressing plate, and the elastic element is arranged between the pressing plate and the adapter.

5. The multi-function machine of claim 4, wherein: and the fastening piece is provided with a stop ring for stopping the adapter from axially disengaging.

6. The multi-function machine of claim 1, wherein: the adapter comprises a disc-shaped main body, the shape matching part is formed by radially and outwardly extending the outer circumference of the disc-shaped main body, and the first switching part and the second switching part are formed by axially and convexly extending one side of the disc-shaped main body.

7. The multi-function machine of claim 6, wherein: the form fitting includes at least two form fitting elements extending radially outward from an outer circumference of the disc-shaped body.

8. The multi-function machine of claim 6, wherein: the projection of the outer contour of the disc-shaped main body on a plane perpendicular to the output shaft is a polygon.

9. The multi-function machine of claim 1, wherein: the adapter part at least comprises a first adapter part and a second adapter part which are matched with the connecting holes in different shapes in a shape.

10. The multi-function machine of claim 1, wherein: the second switching part is arranged on one side of the first switching part along the axial direction, and the radial sizes of the first switching part and the second switching part are different.

11. The multi-function machine of claim 1, wherein: the projection shapes of the first transfer part and the second transfer part on a plane perpendicular to the output shaft are different.

12. The multi-function machine of claim 1, wherein: the outer contour of at least one of the first transfer part and the second transfer part is a conical surface or a cylindrical surface.

13. The multi-function machine of claim 1, wherein: the projection of the outer contour of the first transfer part on a plane perpendicular to the output shaft is a regular polygon, and the second transfer part comprises at least two protrusions axially extending from the first transfer part.

14. The multi-function machine of claim 1, wherein: the adapter further comprises a third adapter part which is arranged along the axial direction relative to the first adapter part and the second adapter part, and the radial size of the third adapter part is smaller than that of the first adapter part or the second adapter part.

15. The multi-function machine of claim 14, wherein: the outer contour of the third adapter part is a conical surface or a cylindrical surface.