Improved oscillating hand tool

The present invention relates to a driven vibrating hand tool comprising a drive unit having an electric motor with a drive shaft to which an abrasive head is attached. In general, known abrasives can be described by either arbitrary orbital or regular orbital abrasives.

[0002] In a grinder with an arbitrary trajectory, the disk-shaped platen has an eccentric bearing so that the platen can rotate independently of the rotation of the electric motor and the platen draws an arbitrary trajectory. It is driven by the provided drive device. Such abrasives are commonly used to remove relatively large amounts of material. In addition to this, the rule that the shoe of the polishing machine cannot rotate independently of the rotation of the motor and therefore the shoe is provided so that the shoe follows a regular trajectory and the eccentric bearing is constrained with a drive device. There is also an orbital type polishing machine. The shoes of such a grinder can be used to grind a range of contours and such grinders are generally used to remove relatively small amounts of material, eg for precision work or finishing work. Used for. By selecting a shoe having an appropriate shape, it can be used even in an area where an arbitrary orbital abrasive cannot be used. A fixed eccentric drive for a regular orbital grinder is cheaper and easier than making an eccentric bearing for an arbitrary orbital grinder.

[0003] [Problems to be Solved by the Invention] A known abrasive is either an arbitrary orbital type abrasive or a regular orbital type abrasive, which means that the user has a rough polishing function. When you want to be able to perform both and precision polishing functions, you need to buy two independent devices, one of each type, or just one device. However, both of them mean that they cause disadvantages.

[0004] An object of the present invention is to provide a polishing machine that reduces or substantially eliminates the above-mentioned disadvantages.

[0005] [Means for Solving the Problems] Therefore, the present invention has (i) a drive unit having an electric motor and a drive shaft; (ii) attached to the drive shaft and biased in the radial direction with respect to the drive shaft. With bearings placed in the center; (iii) a second drive shaft attached to an eccentric bearing and (iv) a polishing platen or shoe for polishing any orbital polishing platen or for regular orbital polishing. To mount the polishing head on a second drive shaft comprising a polishing shoe and further comprising a means by which the tool can be selectively engaged to constrain any trajectory of the polishing shoe to a regular trajectory. It is to provide a vibrating hand tool, which is driven with two functions, comprising:

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be further described in connection with the accompanying drawings.

[0007] FIG. 1 shows a drive unit (5) including an electric motor (not shown) and a drive shaft (7) arranged in an upper housing (6). The fan (8) mounted on the drive shaft (7) draws air from the mouth (9) of the lower housing (10) and guides the air through the extraction duct (11) to the discharge hole (12). It is arranged in. The nut (13) is used to anchor the working head (see FIGS. 2 and 3) to the shaft (14), which is mounted radially eccentrically with respect to the drive shaft (7). It is provided in the fan (8) by the bearing (15).

[0008] With two sets of holes, a tapered flexible rubber strut (16) is arranged around the mouth (9) of the lower housing (10). Each flexible strut (16) has a more flexible crank leg (17) that projects from the strut (16) and is located at a distance from the tip (18), hence the leg (16). The end (19) of 17) protrudes beyond the tip (18) of the strut (16) at the unstressed position.

[0009]Whether the drive unit (5) is mounted on the (vibrating) regular orbital abrasive shoe (20) (see Figure 2) or on the arbitrary orbital abrasive platen (21) (see Figure 3). Either.

As seen in FIG. 2, the shoe (20) supported by the tip (18) of the flexible strut (16) is driven by an electric motor via a shaft (7,14). In this case, the crank leg (17) bends from the flexible strut (16) and lies on the upper surface of the shoe (20). The perforated sandpaper sheet (not shown) is made by using a hook-loop type woven piece, such as the one sold as VELCRO®, glued to the surface (22) to create a shoe (20). It may be attached to the outer surface of the. The hole (23) penetrating the shoe (20) promotes the removal of dust and the like from the polished surface via the shoe (20), and the dust and the like are removed from the discharge hole (12) via the extraction duct (11). It is discharged. An extraction hose (not shown) may be attached to the discharge hole (21).

[0011] As seen in FIG. 3, the platen (21) is driven by an electric motor via a shaft (7,14).

[0012] Again, the perforated sandpaper sheet (not shown) can be applied to the outer surface (24) of the platen (21), for example by using a hook-loop type woven piece bonded to the surface (24). It may be attached. The hole (23) penetrating the platen (21) again promotes the removal of dust and the like to the discharge hole (12) via the platen (21). In this case, the flexible strut (16) is supported away from the platen (21) so that the end (19) of the crank leg (17) contacts the platen (21). During operation, the end (19) of the leg (17) is dragged against the rotating platen (21) to exert a braking effect.

[0013] The present invention is a driven vibrating hand capable of easily mounting a regular orbital abrasive head or an efficiently damped arbitrary orbital abrasive head without drive adjustment in this way. Provide tools.

[0014] In the second embodiment shown in FIGS. 4 to 6 of the attached drawings, the same components as those in FIGS. 1 to 3 are given the same numbers.

As can be seen from FIG. 4, a drive unit (5), an upper housing (6), a drive shaft (7), a fan (8), a mouth portion (9), a lower housing (10), a duct ( 11), discharge holes (12), nuts (13), shafts (14) and bearings (15) are described in relation to FIGS. 1 to 4.

[0016] The enclosure (42) surrounds the fan (8) in the lower housing (10), and a flange (44) is provided at the lower end of the wall (46) of the enclosure (42). There is. A plurality of grooves (48) are formed in the flange (44) and receive the corresponding protrusions (50) of the annular braking ring (52). The braking ring (52) is made of a flexible member, such as rubber, and is independent of the enclosure and projects beyond the lower housing (10) when attached to the enclosure (42).

The drive unit (5) is either mounted on a regular orbital abrasive shoe (54) (FIG. 5) or on an arbitrary orbital abrasive platen (56) (FIG. 6). is there.

As can be seen in FIG. 5, the shoe (54) is driven by an electric motor via a shaft (7,14). A groove (58) appropriately made from the thermoplastic material is provided on the upper surface (60) of the shoe (54) and is preferably molded integrally with the back support plate (62) of the shoe. Since the shoe (54) is attached to the shaft (14), the braking ring (52) engages the groove (58).

As can be seen from FIG. 6, the shoe (54) may be removed and replaced with an arbitrary orbital platen (56). A protruding ring (64), appropriately made of thermoplastic and integrally molded with the platen backing plate (66), is provided on the upper surface (68) of the platen (56). Since the platen (56) is attached to the shaft (14), the protruding ring (64) engages the braking ring (52).

During operation, in regular orbital mode, the braking ring (52) engages the groove (58) and constrains the movement of the shoe (54) to normal orbital movement. In any orbital mode, the protruding ring (64) engages and spins around the inner circumference of the braking ring (52), thus limiting the rotational speed of the platen (56) and shutting off power to the unit. It is designed to reduce the downtime sufficiently when it is done.

[0021] In the third embodiment shown in FIGS. 7 to 9 of the accompanying drawings, similar components shown in FIGS. 1 to 6 are again given similar numbers.

[0022] In this embodiment, as can be seen from FIG. 7, four upright plug members (72) are provided below the floor (74) of the motor housing. These plug members (72) are appropriately made of thermoplastic and are preferably molded integrally with the floor (74) of the motor housing.

The drive unit (5) is either mounted on a regular orbital abrasive shoe (76) (FIG. 8) or on an arbitrary orbital abrasive platen (78) (FIG. 9). is there.

[0024] As can be seen from FIG. 8, four legs (80) are provided on the back support plate of the shoe (76). Since the shoe (76) is attached to the shaft (14), each leg (80) engages with the corresponding plug member (72). The legs (80) are formed to engage the plug member (72) and may be made of any thermoplastic material, such as rubber or synthetic plastic material, and are integrally welded, screwed, glued together. , Mold or suitable means may be fixed to the shoe (76).

As can be seen from FIG. 9, the shoe (76) may be removed and replaced with an arbitrary orbital abrasive platen (78). If it is desired to install a braking device on the abrasive in the arbitrary orbit mode, then an independent braking device needs to be installed by a known method.

[0026] During operation, in regular orbital mode, each leg (80) engages the corresponding plug member (72) and the movement of the shoe is constrained to normal regular movement. In any orbital mode, the platen is free to rotate in any orbit.

[0027] In the embodiments shown in FIGS. 7-9, the legs are attached to the shoes and engage the plug members in the drive unit. However, it is within the scope of the present invention for the leg to be attached to the drive unit and to engage the plug member on the backing plate of the shoe. With respect to this deformation, it is possible for the leg to exert a braking effect in any trajectory mode, thus eliminating the need for a separate braking element.

[0028] The driven vibrating hand tool of the present invention is particularly used with a polishing head such as an arbitrary orbital abrasive platen and an orbital abrasive shoe, but a tool to which a more selective vibration head can be attached. Of course, it is within the scope of the present invention to install.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional side view of a drive unit according to a first embodiment of the hand tool of the present invention, which is shown without an actuating head.

FIG. 2 is a side view of the lower end portion of the drive unit of FIG. 1 when the track abrasive shoe is attached.

FIG. 3 is a side view of the lower end portion of the drive unit of FIG. 1 when an arbitrary track abrasive platen is attached.

FIG. 4 is a partial cross-sectional side view of a drive unit according to a second embodiment of the hand tool of the present invention, which is shown without an actuating head.

5 is a side view of the lower end of the drive unit of FIG. 4 when the track abrasive shoe is attached.

FIG. 6 is a side view of the lower end portion of the drive unit of FIG. 4 when the abrasive platen of an arbitrary track is attached.

FIG. 7 is a partial cross-sectional side view of a drive unit according to a third embodiment of the hand tool of the present invention, which is shown without an actuating head.

FIG. 8 is a side view of the lower end portion of the drive unit of FIG. 7 when the track abrasive shoe is attached.

FIG. 9 is a side view of the lower end portion of the drive unit of FIG. 7 when the abrasive platen of an arbitrary track is attached.

[Description of Code] 5 ... Drive Unit 7 ... Drive Shaft 13 ... Nut 14 ... Drive Shaft 15 ... Bearing 16 ... Flexible Components (Flexible) Strut) 17 ... Hard component (crank leg) 20,54,76 ... Polished shoe 21,56,78 ... Polished platen 52 ... Flexible component (annular braking ring) 58 ... Rigid component (groove) 72 ... Rigid component (plug member) 80 ... Flexible component (leg)