CN1082414C - Hand electric polisher - Google Patents

Abstract

In an electric motordriven hand-held grinding machine with a housing having a hollow cylindrical haft and an angled head continuing on therefrom in one piece, on the haft of which housing a gripping region is provided, and with a grinding tool disposed next to that end face of the angled head that points downwards in the position of use, the underside of the haft is drawn-in more deeply into the contour of the haft over the gripping region, with a reduction in the distance from the upper side of the haft, for the purpose of optimised ergonomy of the said gripping region). The upper side of the haft is, in addition, preferably provided in the gripping region with rubberizing which, made of soft plastic, is moulded-on, as the second component, onto the hard plastic housing.

Description

Handheld electric grinder

The invention relates to a hand-held electric grinder (sandpaper machine).

In the known hand-held sander of this type (EP0610801A1), the relatively slender grip cylinder of the housing is designed with an approximately elliptical to circular cross-section, and in the grip area can facilitate the user to a certain extent. Hold it with the manipulating hand. At this time, the fingertips buckle the lower side of the cylinder, and the thumb is placed on the switch slide, so the switch slide can be manipulated by simple thumb movements. Because the motor is housed inside the cylinder and the exhaust duct passes through, the cross section of the cylinder cannot be arbitrarily reduced in order to ensure that anyone can easily operate the hand-held grinder.

The object of the present invention is to improve the convenience and safety of the hand-held electric sander of the present invention by means of a softer and more secure non-slip grip.

The technical solution to the above-mentioned object consists in that the hand-held electric grinder has a housing with a substantially hollow-cylindrical body and an angular head integral with it, on which There is a grip area for one manipulating hand; there is a grinding tool mounted next to the end face of the angled head facing downwards in the working position, which can be driven by an electric motor housed in the barrel; there is a A switch slide in the grip area on the upper side of the barrel facing away from the polishing tool for switching the motor on and off; Road for vacuuming polishing tools, wherein: the lower side of the cylinder is retracted deeper into the contour of the cylinder along the gripping area, reducing the distance to the upper side of the cylinder.

The advantage of the hand-held electric sander according to the invention is that, despite the presence of the electric motor, the switch slide and the dust extraction duct, the cylinder in the grip area is reduced for better handling of the hand-held sander Circumference, thus having the best man-machine structure. According to the invention, the "retraction" of the underside of the cylinder which delimits the air outlet duct takes place to such an extent that the air outlet duct extends in the grip region directly beside the motor stator in the axial direction of the motor.

If, according to a preferred embodiment of the invention, a rubber layer is provided on the upper side of the cylinder at least in the grip area, the operating comfort of the hand-held sander can be further increased. Thus, the grip area is both non-slip and shock-absorbing.

According to an advantageous embodiment of the invention, the casing is made of hard plastic and the rubber layer is made of soft plastic, in which case this soft component is pressed as a second component in a so-called two-component molding process Note on hard components. The two plastic components are thus permanently and firmly materially joined, which has the advantage compared to a mechanical connection by gluing in that it is possible to make the total wall thickness of the housing in the grip area very small, which This is consistent with the desire to have a smaller grip circumference in the grip area.

The invention is described in detail below with the aid of an exemplary embodiment shown in the drawing. in:

Fig. 1 Partial cut-away side view of the hand-held electric grinder;

Figure 2 The top view of the hand-held grinder in Figure 1.

The hand-held sander shown in side view and partial section in FIG. 1 is designed as a triangular triangle sander equipped with a triangularly symmetrical grinding plate as the sanding tool 10 . Burr sheet 11 is housed with the grinding plate lower side made of plastics, is used for the sand paper that does not show in the installation figure. However, this handheld sander can also be designed as a so-called oscillating sander with a rectangular grinding plate, or as an eccentric sander with a rotating grinding wheel. Instead of a grinding plate, the triangular sander can also be equipped with special grinding tools, such as disc grinding attachments or sanding discs or sanding tubes.

The handheld sander has a double-shell housing 12 consisting of two housing parts 121 , 122 . They join together along a seam 123 which runs parallel to the longitudinal axis of the housing in the center of the upper and lower sides of the housing. The housing 12, which consists of two housing parts 121, 122, has a substantially hollow-cylindrical body 13 and an angular head 14 which extends integrally therewith. On the end face 141 of the angle head 14 that is facing downwards towards the workpiece to be processed in the working position of the hand-held grinder, an eccentric journal 15 that is made on the working shaft is provided, and the ball bearing 16 passes through the eccentric journal 15. A tool holder 17 is provided for the replaceable mounting of the grinding tool 10 . The driven shaft, which is housed in the angular head 14 in a rotary bearing fixed in the housing, is driven by an electric motor 18 housed in the cylinder 13 via a bevel gear not visible here. The electric motor 18 is switched on and off by means of a switch slide 19 arranged on the upper side 131 of the cylinder 13 . When the electric motor 18 is switched on, the rotating working shaft causes the eccentric journal 15 to rotate around the axis of the working shaft, so that the tool holder 17 , which is flexibly secured against rotation on the angle head 14 , executes an oscillating movement of the rotary circle. A suction chamber 20 is provided in the tool holder 17 , the underside of which is covered by the triangular grinding plate of the polishing tool 10 . The dust suction chamber 20 is connected to a housing 12 combined with the exhaust hole in the sanding tool 10 and the corresponding hole in the sandpaper that is open in the direction of the workpiece grinding surface and through the bellows 21, which cannot be seen here. On the exhaust duct 22. As can be seen from FIG. 1 , the exhaust duct 22 extends along the underside 132 of the cylinder 13 and partly along the underside of the angled head 14 and ends in a connecting pipe 23 mounted on the housing 12 for the dust suction blower.

A grip area 24 for an operating hand is formed on the cylinder 13 of the housing 12 , in which grip area 24 the hand-held sander is held by the user. The switch slide 19 on the upper side 131 of the cylinder 13 is arranged such that it can be actuated by the user with a thumb movement. In order to obtain a grip area 24 that is ergonomically designed and has a small grip circumference that can be gripped very comfortably, the underside 132 of the cylinder 13 is retracted deeper into the barrel along the grip area 24 profile to reduce the distance from the upper side 131 of the barrel. The exhaust duct 22, which is continuous below the grip area 24 and is directly bounded by the underside 132 of the cylinder 13, is directly next to the electric motor 18 which is also located in the cylinder 13 below the grip area 24 and along the axis of the motor. to extend. The lower side 132 of the barrel enters the gripping area 24 and the transition area from the gripping area 24 is designed as a concave arc.

It can be seen from FIG. 2 that the upper side 131 of the cylinder 13 is provided with a rubber layer 25 in the grip area 24, which preferably has a surface structure, for example with protrusions or ribs. The rubber layer 25 extends beyond the grip area 24 on the upper side of the cylinder 13 as far as the end of the angled head 14 , as can be seen from FIGS. 1 and 2 . The rubber layer 25 consists of soft plastic and is injection-molded as the second component in the two-component molding method onto the casing 12 which is injection-molded from hard plastic. When the housing 12 is a double shell, each housing part 121 or 122 is manufactured separately and is provided with a corresponding part of the rubber layer 25 .

Claims (8)

1. hand electric polisher, a shell (12) is arranged, shell (12) has the cylindrical shell (13) and the dihedral head (14) that has to become the monoblock type continuity with it that are essentially hollow cylinder, is provided with to be used for a grasping section (24) of handling hand on cylindrical shell (13); The polissoir (10) that end face (a 141) next-door neighbour installation of ventricumbent dihedral head (14) in the operating position is arranged, polissoir (10) can be driven by a motor (18) that be contained in the cylindrical shell (13); There is one to be contained in cylindrical shell (13), is used to switch on and off motor (18) back to the last switch slide plate (19) in grasping section (24) of the upside (131) of polissoir (10); And, there is one to extend and be combined in exhaust duct (22) in the shell (12) along cylindrical shell (13) downside (132), be used for the dust suction of polissoir (10), it is characterized by: the downside (132) of cylindrical shell (13) more deeply in the retraction cylindrical shell profile, has reduced the distance with cylindrical shell upside (132) along grasping section (24).

2. according to the described hand electric polisher of claim 1, it is characterized by: transition area design that cylindrical shell downside (132) advances and go out grasping section (24) is an arcs of recesses.

3. according to claim 1 or 2 described hand electric polishers, it is characterized by: motor (18) is contained in the interior grasping section of cylindrical shell (13) (24) below; Exhausting duct (22) is the border with the downside of cylindrical shell (13) directly, and extends along motor (18) that is by it in grasping section (24).

4. according to the described hand electric polisher of claim 3, it is characterized by: the upside (131) of cylindrical shell (13) is provided with rubber layer (25) at grasping section (24) at least.

5. according to the described hand electric polisher of claim 4, it is characterized by: rubber layer (25) has a kind of surface texture, for example projection or rib.

6. according to the described hand electric polisher of claim 5, it is characterized by: exceed grasping section (24) at the rubber layer (25) of cylindrical shell (13) upside (131) and be extended to dihedral head (14).

7. according to the described hand electric polisher of claim 6, it is characterized by: shell (12) is used the rigid plastics manufacturing, and rubber layer (25) is made up of flexible plastic.

8. according to the described hand electric polisher of claim 7, it is characterized by: rubber layer (25) in the bi-component forming process as the second component pressure injection on plastic casing (12).

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