DE102004024035A1 - Handle for a motor-driven hand tool - Google Patents

Abstract

The handle has a pipe extending over a 3/4-circle, with a fuse switch, and a sensor extending spatially along from the outside of the pipe. The pipe is formed of two half shells (5, 6) with a laminar mounting plate element (10, 11) along the 0.75 circle. A laminar capacitive sensor extends over the range. Both half shells have a laminar mounting plate separated from each other with the sensors held on the plate. The mounting plate element has an oblong surface with pre-aged pins and the sensor formed as strips (25, 26) and wedged between the pins and the surface.

Description

The The invention relates to a handle for a motor-driven hand tool, for example a power saw, the provided with a switch, preferably a safety switch is to operate it a grip of the handle by an operator required is.

such Handles with safety switches are usually on a second Handle of such a motor-driven hand tool provided so that the person handling the motor-driven hand tool sure both hands on has a handle - namely the first hand on the normally-indexed ON / OFF switch on a first handle and the second hand on the second handle - which causes a safety switch operated becomes. Only if the safety switch on the second handle is switched on is, the turn-on is on the ON / OFF switch on the first handle Approved. This ensures that while the operating engine is running and the tool (drill, knife or similar) is in operation no hand of the operator is in a position where she can be hurt.

adversely on known, provided with a security protection handles this Kind is that they required a certain operating position of the "second" hand make - namely, the which actuates the safety switch - while off ergonomic reasons it is often more convenient if you can touch this second handle in another place.

task The invention is therefore a handle of the type mentioned to train so that you can touch this handle anywhere and nevertheless the safety switch is actuated.

These Task is according to the invention solved by that the handle passes through a tube of electrically non-conductive material is formed, in which an electromagnetic sensor is arranged. Advantageous developments are defined in the subclaims.

One embodiment The invention and its advantageous developments is hereinafter with the attached Drawings described. They show:

1 an embodiment;

2 a plan view of the embodiment;

3 a view for the account of arrows III-III in 2 ;

4 a view in the direction of arrows IV-IV in 2 ;

5 a section in the direction of the arrows VV in 2 ; and

6 a section in the direction of arrows VI-VI in 4 ,

1 shows a handle 1 which is formed by a pipe. The tube is approximately in the shape of a ¾ circle. With its aligned faces 2 For example, it can be bolted to a powered hand tool, such as a power drill, power saw, angle grinder, or similar device. For this purpose, as are out 3 and 6 to see the faces 2 with blind holes 3 provided, which have an internal thread. A motor-driven hand tool of this type (not shown) has two handles, wherein the actual ON / OFF switch on a first handle (not shown) is mounted so that it can be operated with the forefinger, while the second switch a Safety switch is that serves to make the on / off on the first handle only take effect, although this second "safety" switch is operated by the fact that the operator also holds the second handle.

Around such a safety switch is here.

This is how best of the 5 and 6 to be seen, formed by a tube that consists of two half-shells 5 and 6 is composed. The half shell 5 has inside two spaced apart, mutually parallel circular surfaces 10 . 11 on. They arise at the inside of a ring 15 with which the half shell 5 in the half shell 6 or in a provided in this corresponding recess 7 is used.

Furthermore, on the half shell 6 inside along the surfaces 10 . 11 at a distance of 10 to 20 cm pins 20 provided, each of the associated area 10 or 11 have a distance of 0.5 to 1.0 mm. Between these pins 20 and the surfaces 10 respectively 11 Then the actual formed as a film or board capacitive sensor elements or sensors 25 . 26 trapped and through the lower surface 7 ' the recess 7 supported. Im simple In th case, the two capacitive sensors 25, 26 may be those in which a metal layer is applied flatly to a foil. Two sensors, like here the two sensors 25 . 26 , are provided for safety reasons. The capacity is then influenced by touching the tube at any point. Depending on this, a signal is then generated in an evaluation circuit. The sensors 25 . 26 are with connecting wires 30 . 31 provided by the connection opening 32 through in a cable 33 are guided, which is connected to the control device of the tool, in which the said evaluation circuit is provided. The use of a strip-shaped foil makes it possible in a simple manner for the sensor to be distributed spatially over the entire area that can be touched on the outside.

Other Of course, types of sensors are also possible. she have to just satisfy the requirement that the grip of the handle by an operator on a Any point sufficient to change the output from the sensor Signal to give and so the said function as a safety switch to fulfill. It So come inductive sensors in question.

For easier handling, the outer surface of the handle is grooved 40 provided that allow a non-slip touch.

1

Handle

2

faces

3

blind holes

5, 6

shells

7

Recess in 6

7 '

lower surface of 6 (in 5 )

10 11

 surfaces

15

ring

20

pencils

25 26

 capacitive sensors

30 31

 leads

32

port opening

33

connection cable

40

Grooves (outside 5 . 6 )

Claims (10)

Handle for a motor-driven hand tool, for example a power saw, which is provided with a switch, preferably a safety switch, the operation of which requires a grip on the handle by an operator, characterized in that the handle ( 1 ) through a pipe ( 5 . 6 ) is formed of electrically non-conductive material in which an electromagnetic sensor ( 25 . 26 ) is arranged, whose output signal changes when touched at each position. Handle according to claim 1, characterized in that the sensor in its spatial Arrangement over the entire outside touchable area of the pipe is distributed. Handle according to claim 1 or 2, characterized in that the sensor is a capacitive sensor ( 25 . 26 ). Handle according to one of claims 1 to 3, characterized in that the tube by two nested half shells ( 5 . 6 ) is formed, wherein the half-shells inside spaced-apart support elements ( 10 . 11 ), where the sensors ( 25 . 26 ) are arranged. Handle according to claim 4, characterized in that the first holding elements area ( 10 . 11 ) are formed. Handle according to claim 4 or 5, characterized in that the half shells spaced from the said support elements ( 10 . 11 ) second support elements ( 20 ), so that a sensor ( 25 . 26 ) between the first-mentioned holding elements ( 10 . 11 ) and the second support elements ( 20 ) can be arranged. Handle according to claim 4, characterized in that half shells ( 5 . 6 ) inside at least one elongated surface ( 10 . 11 ) spaced at intervals pins ( 20 ) and that the sensor formed as a strip ( 25 . 26 ) between the pins ( 20 ) and the area ( 10 . 11 ) is clamped. Handle according to one of claims 1-7, characterized in that the tube is formed about 3/4 circular and two for screwing the handle ( 1 ) surfaces suitable for a tool ( 2 ) having. Handle according to one of claims 3 to 8, characterized two independent sensors are arranged along the circumference, the two independent ones Form safety switch. Handle according to claim 9, characterized in that as two sensors coated two opposite Foils or boards are provided.