JP2000176861A - Portable machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To store a means to damp radio interference disturbance output with no play and by periodic damping and to prevent high abrasion and mechanical breakage. SOLUTION: An electric connecting cable 16 of an electric motor free to connect to an electric power source and furnished with a brush plate 18 is free to connect to a ring core choke 22 to damp radio interference disturbance output through a cable connecting means 26, the ring core choke 22 to damp radio interference disturbance output and the cable connecting means 26 are stored in a common exclusive choke housing 30 and it can be inserted into the inside of a machine housing 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hand-held machine tool comprising a machine housing and an electric motor which can be connected to a power supply, preferably having a brush plate, wherein the electric connection cable of the electric motor comprises: The interference jamming output (Funkstoerleistun) is connected via the cable connection means.
gen), in particular of the type which can be connected to means designed as chokes, preferably as ring core chokes.

[0002]

2. Description of the Prior Art A hand-held device having an electric motor, the electric connection cable of which the power supply of the electric motor can be connected, coupled with means for attenuating the interference power produced by the commutator system of the electric motor. Type machine tools are known. Such means, also called "anti-jamming chokes", are formed, for example, as coils, which have a straight ferrite core or a ring-shaped ferrite core. In known hand-held machine tools, the anti-jamming choke is accommodated in a notch provided in the machine housing, or, if the choke is a ring core choke, mounted on a mandrel inside the machine housing. . In this case, the connection wire of the choke is formed relatively long and reaches a connection point which is relatively large and remote.

[0003] Such a choke is supported on a housing provided in the machine housing with a relatively large amount of play based on a relatively large machine housing tolerance, whereby the choke is a hand-held machine tool. Suffers from high wear due to the inherent vibrations of the vehicle, and such wear can lead to mechanical destruction.

[0004]

SUMMARY OF THE INVENTION The object of the invention is to improve a hand-held machine tool of the type mentioned at the outset in which the means for attenuating the jamming power are housed without play, vibration-damped, It is an object of the present invention to provide a hand-held machine tool that does not cause high wear and thus breakage of the machine.

[0005]

According to an aspect of the present invention, there is provided a device for attenuating an interference output,
The cable connection means are housed in one common dedicated choke housing so that it can be assembled, in particular pluggable, inside the machine housing.

[0006]

The hand-held machine tool according to the invention has the advantage that the choke is housed without play and in a vibration-damped manner in a dedicated choke housing dimensioned exactly to the choke dimensions. is there. With this, the cable connection of the choke to the cable terminal,
The risk of unintentional dissociation or loosening due to the freely oscillating choke mass is reduced. Furthermore, the cable end of the choke can be fixed in the choke housing, so that it can be dimensioned particularly short. As a result, the choke has a longer life than before and can be assembled more easily.

The fact that the choke housing can be inserted into the machine housing of the hand-held machine tool together with the choke incorporated in the choke housing greatly simplifies the assembly of the hand-held machine tool.

[0008] The choke housing is a socket terminal strip type or block terminal strip type (luest).
erklemmartig. By supporting the cable connection means of (1), the connection between the motor and the cable connected to the power supply becomes particularly simple.

Since the choke housing is made of plastic, the choke housing is particularly lightweight,
Serves as an additional electrical insulator for the choke.

[0010] If the cable connection means is formed as a connector, a particularly simple and quick assembly, in particular on the brush plate, is possible. In this case, it is advantageous if the brush plate has a corresponding connector for the choke.

Due to the fact that the choke housing is made of plastic, it is possible to apply a significant mechanical preload or preload to the choke housing and insert it into a corresponding recess in the machine housing. In this way, the choke housing can be arranged inside the hand-held machine tool, in particular in a position-proof manner.

It is further advantageous if the choke coil is connected to the choke housing by means of embedding and the like during the casting of the choke housing.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 and 2 show a hand-held machine tool 1.
0 is shown in plan view. Hand-held machine tool 1
A housing shell 14 of the housing 12 supports an electric motor 11 for driving a driving roller 13 of a grinding belt (not shown) that can be driven to circulate. At the rear end of the housing 12, the electrical connection cable 1
6 has been pulled out. This electrical connection cable 16
It can be electrically connected to the electric motor 11 via a brush plate 18, also called a bearing bracket. The brush plate 18 is provided for supporting and rectifying the electric motor 11 and a rotation speed control unit (not shown).
Is supported. Brush plate 1
In front of 8, a choke 22 is connected, which attenuates the disturbance caused by the current flow or the arc between the brushes of the brush plate 18 and the commutator (not shown) of the electric motor 11.

The choke 22 is inserted into a housing compartment 24 provided in the housing shell 14. The choke 22 is located on the upper part of the electrical connection cable 1.
6 supports a block terminal strip type (also called a socket terminal strip type) tightening screw 26 for locking the connection wire 28 of 6 in the insertion opening 40. The actual choke 22 is provided inside the choke housing 30, and the choke housing 30
4 is housed therein.

FIG. 3 is an enlarged view of the area where the choke 22 is arranged inside the hand-held machine tool 10 shown in FIGS. As can be clearly seen from FIG. 3, the housing compartment 24 is
The choke housing 30, which is arranged adjacent to 0 and has a clamping screw 26, is shaped like a block terminal strip.

FIG. 4 shows the choke 22 alone. As can be seen from FIG.
Is formed as a flat rectangular parallelepiped. FIG. 4 also shows the output wire 38 of the choke coil 35 and the plug-in opening 40 for coupling with the electrical connection cable 16, which are drawn out from the area of the clamping screw 26 at the top.

The choke housing 30 has a lower end,
It has an inclined surface 42 that tapers downward, which reduces the volume of the choke housing 30 or the space in which the choke housing 30 is constructed, and reduces the volume of the housing shell 14 during assembly of the hand-held machine tool 10. It facilitates introduction of the choke housing 30 into the housing compartment 24.

FIG. 5 shows the choke housing 30 of FIG.
The flat side opposite to the flat side shown in FIG. FIG.
In FIG. 3, a ring core 34 and a coil wire 36 wound around the ring core 34 can be seen. Further, as can be seen from FIG. 5, the ring-shaped choke coil 35 is fixed in a circular notch 32 provided in the choke housing 30. In this case, a plurality of fingers 44 are provided which protrude inward in the radial direction from the circular opening or notch 32, and these fingers 44 are provided.
The ring coil 3 is mounted so that the ring coil 35 is fixed in the notch 32 undetachably and particularly elastically preloaded or preloaded.
5 and are engaged.

Further, the choke housing 30 has a straight slit 33 extending outward from the circular notch 32, in which the output wire 38 of the choke coil 35 is elastically preloaded or preloaded. Preloaded and held.

In a non-illustrated embodiment of the invention, the choke housing has a straight cylindrical notch (effectively a wide slit), rather than a circular notch. A rod core choke is accommodated in the notch, and is held by being elastically preloaded or preloaded while being prevented from being lost or dropped by elastic fingers as in the case of FIG. .

In order to use the new choke advantageously,
Any appliance with an electric motor type driving device, such as a hand-held electric grinding device, a hand-held electric saw, a hand-held electric shaver and the like, such as an electric cooking utensil.

[Brief description of the drawings]

FIG. 1 is a plan view of an open housing shell of a hand-held machine tool with assembled chokes.

FIG. 2 is an enlarged view showing a part of the housing shell shown in FIG. 1;

FIG. 3 is a diagram showing a part of the housing shell shown in FIG. 1 in a further enlarged manner.

FIG. 4 is a side view of the choke housing.

FIG. 5 is a rear side view of a choke housing with an integrated ring core choke.

[Explanation of symbols]

10 Hand-held machine tool, 11 Electric motor, 12
Housing, 13 drive roller, 14 housing shell, 16 electrical connection cable, 18 brush plate, 20 speed control car, 22 choke, 2
4 housing compartment, 26 tightening screws, 28 connecting wires, 30 choke housing,
32 notch, 33 slit, 34 ring core, 35 choke coil, 36 coil wire, 3
8 output wires, 40 insertion openings, 42 slopes,
44 fingers

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Alfred Frech Germany Reinfelden-E Hitterdingen Geranienstrasse 21 (72) Inventor Gerd Berner Germany Germany Stuttgart a Rute Dorfstrasse 34 (72) Inventor Kusaba Kleiter Germany Stuttgart a M Seegraben 10 (72) Inventor Uwe Engelfleet Germany Ostfildern Bopserweg 31

Claims (10)

[Claims] 1. A hand-held machine tool (10) comprising a machine housing (12) and an electric motor (11) with a power supply, preferably a brush plate (18), comprising an electric motor. (11) Electrical connection cable (16)
Attenuates the interference output via the cable connection means (26), in particular of the type connectable to the means (22) formed as a choke, preferably as a ring core choke. The damping means (22) and the cable connection means (26) are housed in one common dedicated choke housing (30) and can be assembled, in particular pluggable, inside the machine housing (12). A hand-held machine tool characterized in that: 2. The choke housing (30) is formed as a rectangular parallelepiped, in particular a flat rectangular parallelepiped, the choke housing (30) having a ring core (34) in a notch (32). Coil (35)
2. The hand-held machine tool according to claim 1, wherein the machine tool supports the output wire (38) of the choke coil (35). 3. 3. The notch (32) surrounds the choke coil (35) in a form-fitting manner, that is to say by a mating engagement, and in particular, the choke coil (35).
3. The hand-held machine tool according to claim 2, wherein the tool is frictionally connected. 4. A resiliently preloadable finger (44) in which a choke coil (35) protrudes radially inwardly in said notch (32) formed as an opening. 4. The hand-held machine tool according to claim 3, wherein the machine tool can be preloaded and fixed. 5. The housing according to claim 4, wherein the choke housing (30), which is formed in the shape of a die, is made of plastic and can be inserted into a housing compartment (24) provided in the housing shell (14). Hand-held machine tool. 6. The hand-held machine tool according to claim 5, wherein the choke housing has an inclined surface on a lower surface facing the housing shell. 7. The cable terminal according to claim 1, wherein the cable connection means is formed as a cable-connectable block terminal strip screw terminal.
The hand-held machine tool described in the item. 8. Hand-held tool according to claim 1, wherein the cable connection means (26) is shaped like a socket and the output wire (38) is shaped like a connector. machine. 9. The hand-held machine tool according to claim 8, wherein the connector is connectable with a corresponding connector arranged on the brush plate. 10. The choke coil (35) is embedded in the choke housing (30) during casting and similar means by means of embedding and the like.
10. The hand-held machine tool according to claim 9, wherein the machine tool is coupled to the machine tool.