CN105729410B - Multifunctional machine - Google Patents

Abstract

A multifunctional machine comprises an output shaft and a fastener, wherein the output shaft is used for mounting a working head and driving the working head to move, the fastener is used for mounting the working head on the output shaft, the working head is provided with a mounting part which can be connected to the output shaft, the tail end of the output shaft is provided with a driving part matched and connected with the mounting part of the working head, and the driving part is provided with a friction surface which is in contact with the upper surface of the mounting part. The friction surface is closely matched with the upper surface of the mounting part, so that working heads of different types can be connected with the multifunctional machine, and the universality and the convenience of the multifunctional machine are greatly improved.

Description

Multifunctional machine

The invention is a divisional application of Chinese invention patent application with the invention name of 'multifunctional machine' and application number of 201110299618.9, which is applied by the applicant at 29/9/2011.

Technical Field

The invention relates to a multifunctional machine, in particular to a multifunctional machine capable of being provided with various different types of working heads.

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 the user installs different accessory working heads on the output shaft, the purpose can be achieved

And the device has various different operation functions, such as sawing, cutting, grinding, scraping and the like, so as to adapt to different working requirements.

The conventional multifunctional machine is provided with a form-fit mechanism for transmitting torque between a working head and an output shaft. If the working head is provided with a star-shaped opening with eight round corners, and the round corners are continuously connected. Correspondingly, the tail end of the output shaft radially protrudes and extends to form four fillet-shaped bulges. When the working head is mounted on the output shaft, the star-shaped opening is just sleeved on the round-angle-shaped bulge of the output shaft, and then the working head is mounted on the output shaft through the screw.

However, the above-mentioned multifunctional machine has the disadvantages that: the precondition for mounting the working head on the output shaft is that the star-shaped opening of the working head is matched with the shape of the bulge on the output shaft, otherwise, if the working head with the opening of other shape is replaced, the working head cannot be mounted on the output shaft. Therefore, the kinds of working heads to which the output shaft can be connected are limited.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: a multi-function machine is provided to which various types of work heads can be connected.

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 driving the working head to move, the fastener is used for mounting the working head on the output shaft, the working head is provided with a mounting part which can be connected to the output shaft, the tail end of the output shaft is provided with a driving part matched and connected with the mounting part of the working head, and the driving part is provided with a friction surface which is in contact with the upper surface of the mounting part.

Compared with the prior art, the invention has the beneficial effects that: the friction surface is closely matched with the upper surface of the mounting part, so that the working heads of different types of the multifunctional machine can be connected, the universality and the convenience of the multifunctional machine are greatly improved, and the friction force generated between the friction surface and the upper surface of the mounting part is large enough, so that the swinging torque on the output shaft can be transmitted to the working head in the working process of the multifunctional machine, and the working head cannot slip.

Preferably, the friction face is formed mainly of a plurality of ribs.

Preferably, the rib extends radially with respect to the axis of the output shaft.

Preferably, the friction surface is formed by a plurality of axially projecting spindles.

Preferably, the mandrel is conical.

Preferably, the mandrel is arranged in a circular ring shape.

Preferably, the friction facing comprises a coating layer comprising a friction material.

Preferably, the coating layer is mainly composed of a metal material.

Preferably, the driving part is provided with a recess, and the multifunctional machine further comprises a centering element engaged with the recess.

Preferably, the centering element comprises a first surface, a second surface opposite to the first surface, a peripheral wall connecting the first surface and the second surface, and a central positioning hole for a fastener to pass through, and the second surface is provided with a shape matching part matched with the mounting part.

Preferably, the first face is a plane.

Preferably, the peripheral wall is uniformly provided with at least two bulges which are contacted with the inner wall of the recess.

Preferably, the centering element is made of a plastic or metal material.

Preferably, the centering element is provided with expansion holes uniformly arranged in the circumferential direction.

Preferably, the shaped portion comprises a boss extending axially from the second face around the centrally located hole, and an outer side wall of the boss is a regular polygon or regular polygon.

Preferably, the shape matching part comprises at least three protrusions, the protrusions extend axially from the second surface and are circumferentially and uniformly arranged, and the protrusions are circular tips extending radially outwards from the central positioning holes.

Preferably, the form fitting comprises at least three locking elements extending axially from the second face and arranged circumferentially uniformly, the locking elements being located outside the centrally located aperture.

Preferably, the cross section of the locking element is any one of trapezoidal, rectangular, triangular, arc-shaped, square, circular or oval.

Drawings

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

Fig. 2 is an exploded perspective view of the head region with a portion of the housing removed in the first embodiment of the multi-function machine of the present invention.

Fig. 3 is a schematic view of an end surface of an output shaft in the first embodiment of the multifunction machine of the present invention.

Fig. 4 is a sectional view showing that the working head is mounted on the output shaft in the first embodiment of the multifunction machine of the present invention.

Fig. 5 is a schematic perspective exploded view of a working head and an output shaft in a second embodiment of the multi-function machine of the present invention.

Fig. 6 is a schematic view of an end surface of an output shaft in the second embodiment of the multifunction machine of the present invention.

Fig. 7 is a schematic perspective exploded view of a working head and an output shaft in a third embodiment of the multi-function machine of the present invention.

Fig. 8 is a schematic view of an end surface of an output shaft in the third embodiment of the multifunction machine of the present invention.

Fig. 9 is a sectional view taken along the line a-a in fig. 7.

Fig. 10 is an enlarged view at B in fig. 9.

Fig. 11 is a schematic perspective exploded view of a working head and an output shaft in a fourth embodiment of the multi-function machine of the present invention.

Fig. 12 is a schematic exploded perspective view of a working head, an output shaft and a centering member in a fifth embodiment of the multi-function machine of the present invention.

FIG. 13 is an exploded perspective view of the working head, the output shaft and the centering element in a fifth embodiment of the multi-function machine of the present invention, wherein the centering element is received in a recess of the output shaft.

Fig. 14 is a schematic view of a first face of a centering member in a fifth embodiment of the multi-function machine of the present invention.

Fig. 15 is a schematic side view of a centering member in a fifth embodiment of the multi-function machine of the present invention.

Fig. 16 is a schematic view of a second surface of a centering member in a fifth embodiment of the multi-function machine of the present invention.

Fig. 17 is a sectional view showing that the working head is mounted on the output shaft via the centering member in the fifth embodiment of the multi-function machine of the present invention.

Fig. 18 is an exploded perspective view of the working head, the output shaft and the centering member in the sixth embodiment of the multi-function machine of the present invention.

Fig. 19 is a schematic view of a first face of a centering member in a sixth embodiment of the multi-function machine of the present invention.

Fig. 20 is a side view schematically showing a centering member in a sixth embodiment of the multi-function machine of the present invention.

Fig. 21 is a schematic view of a second face of a centering member in a sixth embodiment of the multi-function machine of the present invention.

Fig. 22 is an exploded perspective view of the working head, the output shaft and the centering member in the seventh embodiment of the multi-function machine of the present invention.

Fig. 23 is a schematic view of a first face of a centering member in a seventh embodiment of the multi-function machine of the present invention.

Fig. 24 is a schematic side view of a centering member in a seventh embodiment of the multi-function machine of the present invention.

Fig. 25 is a schematic view of a second face of the centering member in the seventh embodiment of the multi-function machine of the present invention.

Wherein the content of the first and second substances,

30. casing 32, output shaft 33, connecting flange

34. Working head 35, round hole 36, fastener

38. Fork element 40, mounting 42, cutting part

44. Connecting hole 46, saw tooth 48, driving part

50. Friction surface 52, 52a rib 54 locking member

56. Drive mechanism 58 press plate 60 lever portion

62. Through-hole 64 push rod 66 operator

68. Pivot 70 groove 72 cam portion

73. Upper surface 74, handle 76, spindle

78. Annular recess 80. coating 82,82b,82c centering element

84. First side 88,88b,88c second side of recess 86,86b,86c

90,90b,90c peripheral wall 92,92b,92c centrally located hole 94,94b,94c shaped fitting

96. Boss 98. inner walls 100,100b,100c are raised

102,102b,102c expansion holes 104b, circular ridges 106b, curved segments

108b, projection 110c, hole 111c, through hole

112c locking element 200 multifunctional machine

Detailed Description

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

Fig. 1 shows a head region of a multi-function machine 200 according to a first embodiment of the present invention. The multifunction machine 200 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.

Referring to fig. 1 and 2, the output shaft 32 is longitudinally disposed inside the housing 30, and the end thereof extends out of the housing 32 by a certain distance. A shifting fork 38 is mounted on the output shaft 32, and when the motor rotates, an eccentric device (not shown) is driven to rotate, and the eccentric device further drives the shifting fork 38 to rotate and swing, so that the output shaft 32 rotates and swings. The end of the output shaft 32 is provided with a larger diameter attachment flange 33. The connecting flange 33 is provided with a circular hole 35 through which a fastening member 36 passes. The connecting flange 33 may be integrally formed with the output shaft 32, or may be fixedly attached to the output shaft 32. In the present invention, the connecting flange 33 is fixedly mounted on the output shaft 32 (see fig. 4).

It should be noted here that the output shaft 32 may be directly provided with a blind threaded bore, and the fastener 36 is a threaded fastening bolt. When the working head is installed, the fastener 36 is only required to penetrate through the working head 34 and be in threaded connection with the threaded blind hole, so that the working head is fixed on the output shaft. However, 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 quick clamping mechanism, which will be described in detail later.

Referring to FIG. 2, the working head 34 is a straight saw blade, and it will be apparent to those skilled in the art that the working head 34 may be other accessories, such as a circular saw blade, a sand disc, a scraper, etc. The working head 34 is made of metal and includes a mounting portion 40 and a cutting portion 42 that can be connected to the connecting flange 33. The mounting portion 40 is provided with a connecting hole 44 through which the fastening member 36 passes, and in the present embodiment, the connecting hole 44 is a regular dodecagon, but the connecting hole 44 may have any shape such as other regular polygons, and circles. The cutting portion 42 is provided at its distal end with saw teeth 46 having a cutting function.

The connection flange 33 at the end of the output shaft 32 is provided with a driving portion 48. The drive section 48 includes a friction surface 50 that contacts the upper surface of the mounting section 40 of the working head 34. The friction force generated between the friction surface 50 and the upper surface of the mounting portion 40 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 200.

Referring to fig. 3, in the present embodiment, the friction surface 50 is formed by a plurality of regularly arranged ribs 52. These ribs 52 are generally fan-shaped and project radially inwardly to intersect the outer edge of the circular hole 35. The cross section of the device can be trapezoidal, rectangular, semicircular, oval and the like, and the top end of the device can be relatively sharp. In this embodiment, the cross-section is rectangular. Of course, the ribs 52 may be radially outwardly projected from any concentric circle concentric with the circular hole 35, or may be arranged in a grid. Further, the ribs 52 may be curved, such as "S", and may be irregularly distributed on the output shaft.

Referring to fig. 4, the quick clamping mechanism includes a locking member 54 and a drive mechanism 56 rotatable about the axis X of the output shaft 32. Rotation of the drive mechanism 56 in one direction drives the locking member 54 and the fastener 36 to thread; the locking member 54 and the fastener 36 are then driven to release when the drive mechanism 56 is rotated in the opposite direction.

The fastener 36 includes an annular pressure plate 58 and a shank 60 extending axially from a central portion of the pressure plate 58, the shank 60 having external threads at a distal end thereof, and the shank 60 being received in a through hole 62 of the output shaft 32 so as not to rotate relative to the output shaft 32. The retaining member 54 is received in the cavity of the output shaft 32. The locking member 54 is substantially annular and can rotate freely in the cavity, and a threaded hole in threaded connection with the fastener is axially formed in the middle of the locking member.

The actuating mechanism 56 includes a push rod 64 for engaging the locking member 54 and actuating the locking member 54 to rotate and an operating member 66 for operating the movement of the push rod 64. The push rod 64 has a pivot 68 mounted at the top and a recess 70 axially formed at the bottom. Wherein the axis of the pivot 68 is perpendicular to the axis X of the output shaft 32. The groove 70 is fitted over the outer circumference of the locker 54 and rotates the locker 54 by the engagement means. The operating member 66 is pivotally connected to the top end of the push rod 64 by a pivot 68. On one side relative to pivot 68, a cam portion 72 is provided, and on the other side, a handle 74 extends generally perpendicular to cam portion 72. Wherein when the handle 74 is rotated about the axis of the pivot 68, the cam portion 72 contacts the upper surface 73 of the housing, thereby causing the push rod 64 to move up and down.

To install a workpiece, the handle 74 is simply manipulated to rotate about the axis of the pivot 68 to move the push rod 64 downwardly so that the recess 70 of the push rod 64 engages the locking member 54. at this point, the handle 74 can be manipulated to rotate about the axis X of the output shaft 32 in the tightening direction to rotate the locking member 54 together to threadedly lock the locking member 54 and the fastener 36 to secure the working head 34 to the output shaft 32.

To remove the working head 34, the handle 74 is simply manipulated to move the push rod 64 downwardly so that the recess 70 of the push rod 64 engages the retaining member 54. at this point, the handle 74 is rotated about the axis X of the output shaft 32 in a loosening direction to rotate the retaining member 54 together until the retaining member 54 is fully unthreaded from the fastener 36. at this point, the fastener 36 can be removed from the output shaft 32 and the working head 34 removed. Since the attachment hole 44 of the mounting portion 40 of the working head 34 is closed, the locking member 54 needs to be completely separated from the fastening member 36 to be removed from the output shaft 32, and the fastening member 36 is inserted through the attachment hole 44 of the working head 34 and then installed into the output shaft 32. Of course, the opening in the working head could be made non-obturating, leaving a gap through which the shank of the fastener can pass. In this case, the fastener does not need to be completely detached from the locking member, and only the locking member needs to be unscrewed, so that a gap through which the mounting portion of the working head can pass is reserved between the fastener and the output shaft.

Referring to fig. 2, 3 and 4, when the multifunctional machine 200 is used, the working head 34 is first placed under the output shaft 32, and the upper surface of the mounting portion 40 of the working head 32 is attached to the protruding rib 52 of the output shaft 32. The raised ribs 52 can achieve a large force transmission connection between the output shaft 32 and the working head 34 in both the axial direction and the circumferential direction, so that the transmitted torque is large enough, and the working head 34 and the output shaft 32 cannot slide relatively.

When the working head 34 is operated, the output shaft 32 is driven by a motor (not shown) to rotate and swing, and due to the existence of the friction surface 50 formed by the convex ribs 52 on the output shaft 32, a sufficient friction force is provided between the output shaft 32 and the upper surface of the mounting portion 40 of the working head 34, so that the swing torque output by the output shaft 32 is further transmitted to the working head 34, and the working head 34 is driven to swing.

The adjacent ribs 52 have larger gaps therebetween, and can also receive dirt and dust on the mounting portion 40 of the working head 34, so that good contact between the ribs 52 and the upper surface of the mounting portion 40 of the working head 34 can be ensured even in a contaminated state of the working head.

In summary, in the first embodiment of the present invention, the friction force generated between the friction surface 50 and the upper surface of the mounting portion 40 of the working head 34 is large enough to transmit the swing torque on the output shaft 32 to the working head 34 during the operation of the multifunctional machine 200 without causing the working head 34 to slip. And the coupling hole 44 of the working head 34 may have any other shape regardless of the shape of the coupling hole 44 itself since the frictional surface 50 is closely fitted to the upper surface of the mounting portion 40 of the working head 34. Therefore, by providing the output shaft 32 with the friction surface 50, different types of work heads can be connected to the multifunction machine 200, and the versatility and convenience of the multifunction machine 200 are greatly improved.

Referring to fig. 5 to 6, the second embodiment of the present invention is different from the first embodiment in that the rib 52a is not a complete rib but is divided by a plurality of rings concentric with the axis X of the output shaft 32, so that the friction surface 50 is formed by a plurality of regularly arranged protrusions. In this way, more dirt and dust on the mounting portion 40 of the working head 34 can be accommodated without affecting the frictional force between the friction surface 50 and the upper surface of the mounting portion 40. When the working head 34 is operated, the output shaft 32 is driven by a motor (not shown) to rotate and swing, and the output shaft 32 is provided with the friction surface 50, so that sufficient friction force is provided between the output shaft 32 and the upper surface of the mounting part 40 of the working head 34, and the swinging torque output by the output shaft 32 is transmitted to the working head 34, so as to drive the working head 34 to swing.

Referring to fig. 7 to 10, the third embodiment of the present invention is different from the first embodiment in that the friction surface 50 is formed of a plurality of spindles 76 regularly arranged. The mandrels 76 are generally conical in shape, and each mandrel 76 is provided with an annular recess 78 around its circumference. When the working head 34 is mounted on the output shaft 32, the tip of the spindle 76 is pressed against the upper surface of the mounting portion 40 of the working head 34. The spindle 76 can achieve a large force transmission connection between the output shaft 32 and the working head 34 in both the axial direction and the circumferential direction, so that the transmitted torque is large enough to ensure that no relative sliding occurs between the working head 34 and the output shaft 32. When the working head 34 is operated, the output shaft 32 is driven by a motor (not shown) to rotate and swing, and due to the existence of the friction surface 50 formed by the mandrel 76 on the output shaft 32, sufficient friction force is provided between the output shaft 32 and the upper surface of the mounting part 40 of the working head 34, so that the swinging torque output by the output shaft 32 is further transmitted to the working head 34, and the working head 34 is driven to swing.

The annular recess 78 accommodates dirt and dust on the mounting portion 40 of the working head 34, thereby ensuring good contact between the spindle 76 and the upper surface of the mounting portion 40 even in contaminated conditions of the working head. The spindle 76 may be formed in other geometric shapes such as a square shape and a rectangular shape, as long as a rough friction surface can be formed; and the spindles 76 may be regularly or irregularly arranged on the output shaft 32.

Referring to fig. 11, the fourth embodiment of the present invention is different from the first embodiment in that the friction surface 50 includes a coating layer 80 containing a friction material, and when the working head 34 is mounted on the output shaft 32, the upper surface of the mounting portion 40 of the working head 34 is attached to the coating layer 80. The coating layer 80 can achieve a large force transfer connection between the output shaft 32 and the working head 34 in both the axial direction and the circumferential direction, so that the torque transferred is large enough to ensure that no relative sliding occurs between the working head 34 and the output shaft 32. When the working head 34 is operated, the output shaft 32 is driven by a motor (not shown) to rotate and swing, and the output shaft 32 is provided with the coating layer 80, so that sufficient friction force is provided between the output shaft 32 and the upper surface of the mounting part 40 of the working head 34, and the swinging torque output by the output shaft 32 is further transmitted to the working head 34, so as to drive the working head 34 to swing.

Of course, the output shaft 32 may be provided without the coating 80, and the rough friction surface may be directly ground at the end of the connection flange 33 of the output shaft 32.

Referring to fig. 12 to 17, in order to more conveniently and rapidly mount the working head in place when the working head is mounted, that is, the center line of the connection hole of the working head coincides with the axis X of the output shaft 32, the multifunctional machine may further be adapted with a centering element 82.

The fifth embodiment of the present invention is different from the first embodiment in that a recess 84 adapted to the centering member 82 is provided on the connecting flange 33 of the output shaft 32. The dimples 84 extend axially inward from the friction face 50 by an axial depth H. The recess 84 has a circular inner wall 98 whose centre line coincides with the axis X of the output shaft 32. In the present embodiment, the cross section of the recess 84 is circular, but may be rectangular, regular polygonal, or the like. The shape of the centering element 82 adapted thereto may therefore also be rectangular, regular polygonal, etc.

The centering member 82 is mounted between the output shaft 32 and the working head 34. The centering element 82 is generally cylindrical in shape and includes a first face 86 facing the recess 84, a second face 88 facing the working head 34, a peripheral wall 90 connecting the first face 86 and the second face 88, and a centrally located aperture 92 through which the fastener 36 passes.

The first surface 86 is opposite to the recess 84 of the output shaft 32, and may have friction surfaces or protrusions that are configured to fit into the recess 84. However, in this embodiment, the first surface 86 may be a flat surface without the need for a friction surface or protrusions. In particular, the second face 88 is opposite the working head 34 and has a contoured portion 94 that mates with the mounting portion 40 of the working head 34. When the form-fitting portion 94 is properly engaged with the mounting portion 40 of the working head 34, centering of the working head 34 is facilitated.

In this embodiment, the first face 86 and the second face 88 are disposed in parallel with a distance L therebetween. The distance L between the first face 86 and the second face 88 is no greater than the axial depth H of the recess 84. In this manner, the upper surface of the mounting portion 40 of the working head 34 is not prevented from contacting the friction surface 50 when the centering member 82 is fitted within the recess 84. Of course, the first and second faces 86, 88 may be non-parallel, but the maximum distance between the two cannot be greater than the axial depth H of the recess 84.

In order that the centering element 82 can be adapted to a variety of working heads, the diameter of the centering element 82 typically ranges from 22 to 30 millimeters, and can be 25 millimeters, 27 millimeters, and the like.

The contoured portion 94 is a hollow boss 96 extending axially from the second face 88, wherein the boss 96 extends radially outward around the centrally located aperture 92. In this embodiment, the outer sidewall of the boss 96 is regular hexagonal and is just matched with the regular dodecagonal connecting hole 44 of the working head 34.

It can be understood that when the connecting hole of the working head is changed, the shape matching part can also be in other shapes matched and connected with the connecting hole of the working head. Here, the outer sidewall of the boss 96 may also be other regular polygons, circles, or other irregular shapes.

The centering element 82 may be made of a plastic or metal material. In this example, the centering element 82 is made of plastic.

In order to provide a better fit of the centering element 82 against the inner wall 98 of the recess 84. At least two elevations 100 are provided uniformly on the circumferential wall 90 of the centering element 82, which elevations are in contact with the inner wall 98 of the recess 84.

In the present embodiment, a total of four protuberances 100 are provided on the peripheral wall 90. The number of protuberances 100 may be any; the ridges 100 may be regularly distributed or irregularly distributed on the peripheral wall 90.

The centering element 82 is provided with circumferentially uniformly arranged expansion holes 102. The expansion holes 102 may cause some deformation of the centering element 82 when the centering element 82 is fitted into the recess 84, thereby facilitating installation of the centering element 82; the centering element 82 may also be removed from the recess 84 by a tool for the operator to pull the centering element 82 out.

The number of the expansion holes 102 may be arbitrary. The expansion hole 102 may be a through hole penetrating the first surface 86 and the second surface 88, or may not be a blind hole. The expansion holes 102 may be regularly and uniformly distributed or irregularly distributed on the first surface 86 or the second surface 88.

In the present embodiment, in order to make the expansion holes 102 perform a better deformation function, the size and the position of the expansion holes 102 may be set as follows: the positions of the expansion holes 102 correspond one-to-one to the positions of the protuberances 100 in the circumferential direction. The length of the expansion hole 102 in the extending direction is longer than the length of the bulge 100 in the extending direction. The center line of the expansion hole 102 encloses a circle concentric with the center positioning hole 92, and the radius of the circle in which the expansion hole 102 is located is 2 times the radius of the center positioning hole 92.

Referring to fig. 12, 13 and 17, when the working head 34 is mounted on the output shaft 32, the centering element 82 is first mounted in the recess 84, and then the working head 34 is sleeved on the centering element 82, and the mounting portion 40 of the working head 34 is matched with the shape matching portion 94 of the centering element 82, so that the center line of the connecting hole 44 of the working head coincides with the axis X of the output shaft 32; then, the fastener 36 is passed through the attachment hole 44, the centrally located hole 92 and into engagement with the threaded hole of the locking member; finally, the handle 74 is operated to rotate about the axis of the pivot 68 to move the push rod 64 downwardly, and the recess 70 of the push rod 64 engages the locking member 54. at this time, the handle 74 is operated to rotate about the axis X of the output shaft 32 in the tightening direction to rotate the locking member 54 together, so that the locking member 54 and the fastening member 36 are threadedly locked, thereby securing the working head 34 to the output shaft 32.

With the centering element 82 fitted within the recess 84, the centering element 82 may fit tightly into the recess 84, making it difficult to rotate relative to the recess 84; of course, the centering element 82 may have a larger clearance from the recess 84 so that it can be easily rotated relative to the recess 84. This is because the frictional force generated between the frictional surface 50 and the upper surface of the mounting portion 40 of the working head 34 is sufficiently large, and the frictional surface 50 ensures that the mounting portion 40 of the working head 34 does not slide relative to the output shaft 32 in both the axial direction and the circumferential direction; in addition to the threaded locking of the locking member 54 and the fastener 36, the working head 34 can be securely mounted to the output shaft 32. Even though the centering element 82 can rotate relative to the recess 84 during installation, the centering element 82 can perform a swinging movement with the working head 34 along with the output shaft 32 after being screwed by the locking member 54 and the fastening member 36.

In the prior art, the working head is fixedly arranged on the output shaft through matching of the bulge on the output shaft and the star-shaped opening of the working head. In this way, the projections and the openings together perform a centering function, a fixing function and a torque function, which results in a very rapid wear of the projections and the openings. In the present invention, the centering element 82 is used for centering, so that the centering function is advantageously separated from the fastening function and/or the torque function. Therefore, wear of the centering member 82, the friction surface 50, the attachment hole 44 of the working head 34, and the like can be reduced.

In contrast, the centering element 82 can be made of a relatively low-cost material, and the corresponding centering element is designed according to the working heads with various mounting portions, so that the cost is not increased under the condition that the multifunctional machine can be matched with various different types of working heads.

And because the centering element 82 is rotatable relative to the recess 84, the angular position of the working head 34 relative to the output shaft 32 can be easily adjusted as desired.

In this embodiment, the friction surface 50 is formed by a plurality of ribs 52. Of course, the friction surfaces 50 according to the second to fourth embodiments of the present invention are also applicable.

The centering element of the present invention is not limited to that described in the fifth embodiment, and other shapes of the centering element will be described in detail below.

Referring to fig. 18, 19, 20 and 21, in a sixth embodiment of the present invention, a working head 34b has substantially the same structure as the working head 34 in the fifth embodiment, and also has a mounting portion 40b and a cutting portion 42b, and the mounting portion 40b is provided with a connecting hole 44 b. The difference is that the shape of the coupling hole 44b is different from the shape of the coupling hole 44 of the working head 34. The connecting hole 44b includes eight radially extending circular ridges 104b, and adjacent circular ridges 104b are continuously connected by a curved section 106b.

The centering member 82b is also different from the centering member 82 in the fifth embodiment with respect to the variation of the connection hole 44 b. Wherein the first face 86b, the ridge 100b and the expansion hole 102b of the centering member 82b are identical in structure to the first face 86, the ridge 100 and the expansion hole 102 in the fifth embodiment. The difference is that the second face 88b is provided with a contoured portion 94b that mates with the mounting portion 40b of the working head 34b that is different from the contoured portion 94.

In this embodiment, the shaped mating portion 94b includes four circumferentially evenly disposed projections 108b extending axially from the second face 88b, each projection 108b being a rounded tip extending radially outward from the outer edge of the centrally located aperture 92 b. The protrusion 108b is just matched and connected with the circular bump 104b and the curved section 106b on the connecting hole 44b of the working head 34b, so that the center line of the connecting hole 44b of the working head 34b is overlapped with the axis X of the output shaft 32, and the centering effect is achieved.

It will be appreciated that the circular ridges 104b of the working head 34b are not limited to eight, but may be larger than two or more, and adjacent circular ridges are continuously connected to each other by curved sections. Correspondingly, the number of the protrusions 108b of the form fitting portion 94b is also limited to four, as long as it is larger than two or more. Of course, it is preferred that the rounded ridges 104b be integer multiples of the protrusions 108b.

Of course, the protrusion 108b may not be provided with a rounded tip, but may have other shapes such as a rectangle, a trapezoid, etc., as long as the shape of the protrusion 108b can match with the rounded protrusion 104b or the curved section 106b. And the protrusions 108b may be disposed uniformly as desired.

Referring to fig. 18, when the working head 34b is mounted on the output shaft 32, the centering element 82b is first mounted in the recess 84, and then the working head 34b is sleeved on the centering element 82b, and the mounting portion 40b of the working head 34b is matched with the shape matching portion 94b of the centering element 82b, so that the center line of the connecting hole 44b of the working head coincides with the axis X of the output shaft 32; referring then to the method described above, the working head 34 is secured to the output shaft 32 by a quick clamping mechanism.

When the working head 34b is operated, the output shaft 32 is driven by a motor (not shown) to rotate and swing, and due to the existence of the friction surface 50 formed by the convex ribs 52 on the output shaft 32, a sufficient friction force is provided between the output shaft 32 and the upper surface of the mounting portion 40b of the working head 34b, so that the swinging torque output by the output shaft 32 is further transmitted to the working head 34b, and the working head 34b is driven to swing.

In this embodiment, the friction surface 50 is formed by a plurality of ribs 52. Of course, the various friction surfaces 50 in the second to fourth embodiments of the present invention are also applicable to the present embodiment.

Referring to fig. 22, 23, 24 and 25, in a seventh embodiment of the present invention, a working head 34c has substantially the same structure as the working head 34 in the fifth embodiment, and also has a mounting portion 40c and a cutting portion 42c, and the mounting portion 40c is provided with a connecting hole 44 c. The difference is that the shape of the coupling hole 44c is different from the shape of the coupling hole 44 of the working head 34. The coupling hole 44c includes twelve holes 110c arranged at intervals on one circumference and through-holes 111c through which the fastening members 36 pass.

The centering member 82c is also different from the centering member 82 in the fifth embodiment with respect to the variation of the connection hole 44 c. Wherein the first face 86c, the ridge 100c, and the expansion hole 102c of the centering element 82bc are identical in structure to the first face 86, the ridge 100, and the expansion hole 102b in the fifth embodiment. The difference is that the second face 88c is provided with a shaped fitting portion 94c that mates with the mounting portion 40c that is different from the shaped fitting portion 94.

In the present embodiment, the form-fitting portion 94c includes twelve locking elements 112c extending axially from the second face 88c and uniformly circumferentially disposed, each locking element 112c being disposed outside the centrally located aperture 92 c. And twelve locking elements 112c are just matched and connected with the twelve holes 110c of the working head 34b, so that the center line of the connecting hole 44c of the working head 34c is superposed with the axis X of the output shaft 32, and the centering effect is achieved.

It is understood that the connection hole 44c of the working head 34c is not limited to twelve holes 110c, as long as it is larger than two or more. Correspondingly, the number of locking elements 112c of the forming portion 94c is also limited to twelve, but is preferably a multiple of two, as long as there are more than two. And preferably the number of apertures 110c is an integer multiple of the number of locking elements 112c.

Of course, the locking elements 112c may be provided as desired, and need not be uniformly arranged.

In the present embodiment, the cross-section of the hole 110c is trapezoidal, and correspondingly, the cross-section of the locking element 112c of the shaped fitting portion 94c is also trapezoidal. For ease of assembly and disassembly, however, the locking element 112c has at least one chamfer for supporting the plunging process, and the working head 34c is centered by the cooperation of the locking element 112c and the bore 110c.

It will be readily understood by those skilled in the art that the cross-sectional shape of the locking element 112c and the aperture 110c is not limited to trapezoidal, but may be one of rectangular, triangular, arcuate, square, circular or elliptical.

Referring to fig. 22, when the working head 34c is mounted on the output shaft 32, the centering element 82c is first mounted in the recess 84, and then the working head 34c is sleeved on the centering element 82c, and the mounting portion 40c of the working head 34c is coupled with the shape-matching portion 94c of the centering element 82c, so that the center line of the connecting hole 44c of the working head 34c coincides with the axis X of the output shaft 32; referring then to the method described above, the working head 34c is secured to the output shaft 32 by a quick clamping mechanism.

When the working head 34c is operated, the output shaft 32 is driven by a motor (not shown) to rotate and swing, and due to the existence of the friction surface 50 formed by the convex ribs 52 on the output shaft 32, a sufficient friction force is provided between the output shaft 32 and the upper surface of the mounting portion 40c of the working head 34c, so that the swinging torque output by the output shaft 32 is further transmitted to the working head 34c, and the working head 34c is driven to swing.

In this embodiment, the friction surface 50 is formed by a plurality of ribs 52. Of course, the various friction surfaces 50 in the second to fourth embodiments of the present invention are also applicable to the present embodiment.

It will be appreciated that the coupling hole 44c includes twelve holes 110c spaced on a circle and through holes 111c through which the fasteners 36 pass. In a fifth embodiment of the invention, the centering element 82 may also be adapted. The outer side wall of the hollow boss 96 of the centering element 82 may be circular. And the through hole 111c is just matched and connected with the boss 96, so that the central line of the connecting hole 44c of the working head 34c is superposed with the axis X of the output shaft 32, and the centering effect is achieved.

Claims (10)

1. A multifunctional machine comprises an output shaft and a fastener, wherein the output shaft is used for mounting a working head and driving the working head to rotate and reciprocate, the fastener is used for mounting the working head on the output shaft, the working head is provided with a mounting part which can be connected to the output shaft, the tail end of the output shaft is provided with a driving part which is matched and connected with the mounting part of the working head, and the multifunctional machine is characterized in that: the driving part is provided with a friction surface, the mounting part is provided with an upper surface, the friction surface is tightly matched with the upper surface, and the friction force generated between the friction surface and the upper surface is used for transmitting the swing torque on the output shaft to the working head to prevent the working head from skidding.

2. The multi-function machine of claim 1, wherein: the driving part is provided with a recess, and the multifunctional machine further comprises a centering element matched with the recess.

3. The multi-function machine of claim 2, wherein: the centering element comprises a first surface, a second surface opposite to the first surface, a peripheral wall for connecting the first surface and the second surface, and a central positioning hole for a fastener to pass through, wherein the second surface is provided with a shape matching part matched with the mounting part.

4. The multi-function machine of claim 3, wherein: the first face is a plane.

5. The multi-function machine of claim 3, wherein: at least two bulges which are contacted with the inner wall of the recess are uniformly arranged on the peripheral wall.

6. The multi-function machine of claim 3, wherein: the centering element is provided with expansion holes which are circumferentially arranged.

7. The multi-function machine of claim 3, wherein: the shape matching part comprises a boss axially extending from the second surface around the central positioning hole, and the outer side wall of the boss is a regular polygon or a regular polygon.

8. The multi-function machine of claim 3, wherein: the form fitting includes at least three projections extending axially from the second face, the projections extending radially outward from the centrally located aperture.

9. The multi-function machine of claim 3, wherein: the form fitting includes at least three locking elements extending axially from the second face, the locking elements being located outside the centrally located aperture.

10. The multi-function machine of claim 9, wherein: the cross section of the locking element is any one of trapezoid, rectangle, triangle, arc, circle or ellipse.

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