EP1595661A1 - Handle with safety device for a motorized handtool - 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 invention relates to a handle for a motor-driven hand tool, for example a Power saw, with a switch, preferably a Safety switch is provided to operate it Grasping the handle by an operator is required.

Such handles with safety switches are usually on a second handle of such motor-driven hand tool provided so that the Person handling the motor-driven hand tool also sure both hands on a handle has - namely the first hand on usually with the index finger pressed ON / OFF switch on a first handle and the second hand on the second handle -, creating a safety switch is pressed. Only if the safety switch on second handle is turned on, the power-on on the ON / OFF switch on the first handle released. Thus is ensure that while the operating engine is running and the tool (drill, knife or similar) in operation is no hand of the operator in one position in which she can be injured.

A disadvantage of known, with a security protection provided handles of this type is that they have a specific Actuation position of the "second" hand required namely the one which operates the safety switch, while for ergonomic reasons it is often more convenient if you put that second handle in another place can touch.

A handle for a motor driven tool according to the The preamble of claim 1 is known from DE 93 08 698 U1 known. There are two opposing parallel mutually extending electrical contact conductor provided when squeezing the plastic channel in which they are are arranged and in turn in a groove (17) of the Outside of a handle for a motor driven Tool is recessed, come into contact and one Trigger safety switch. In this arrangement can quite the case, that you can handle it safely captured with one hand, but not so that also the contacts are operated. In addition, subject to the the two contact conductors surrounding plastic hose in rough environment is a certain wear and tear possibly exposed to damage.

From DE 102 32 934 A1 a handle with Safety circuit has become known in the below a pressure-sensitive zone a fluid chamber system arranged is that with a trained as on / off switch Switching device communicates. When touched, pressure on the pressure-sensitive zone and thus on the fluid exercised, which then actuates the switch. This system is extremely expensive. The switch is located in the fluid. He may be subject to wear. It is that Problem of reliable sealing of the Fluid chamber system. This system is therefore complicated expensive and unreliable.

From DE 103 02 532 A1 is a control for a Hand tool known, when as Touch sensors contact surfaces are provided, which over Threshold switch with integrated sensor circuit are connected. For training along the full extent of an approximately three-quarter-circular handle, this structure is too laborious. There is also the danger in harsh environment a pollution.

The object of the invention is therefore to provide a handle of the The preamble of claim 1 mentioned type so to train that these disadvantages are not given, especially that you have this handle on any Can touch and reliable contact is closed.

This task is performed by the means of the license plate Claim 1 solved. Advantageous developments are defined in subclaims.

Figur 1

ein Ausführungsbeispiel;

Figur 2

eine Draufsicht auf das Ausführungsbeispiel;

Figur 3

eine Ansicht in Rechnung der Pfeile III-III in Figur 2;

Figur 4

eine Ansicht in Richtung der Pfeile IV-IV in Figur 2;

Figur 5

einen Schnitt in Richtung der Pfeile V-V in Figur 2; und

Figur 6

einen Schnitt in Richtung der Pfeile VI-VI in Figur 4.

An embodiment of the invention and its advantageous developments will be described below with reference to the accompanying drawings. They show:

FIG. 1

an embodiment;

FIG. 2

a plan view of the embodiment;

FIG. 3

a view in the bill of arrows III-III in Figure 2;

FIG. 4

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

FIG. 5

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

FIG. 6

a section in the direction of the arrows VI-VI in Figure 4.

Figure 1 shows a handle 1, which is formed by a tube becomes. The tube is approximately in the shape of a ¾ circle. With its aligned faces 2 it can a motorized hand tool, for example a Drill, a chainsaw, an angle grinder or a similar device to be screwed. to this end are, as seen in Figure 3 and Figure 6, the End faces 2 provided with blind holes 3, the one Have internal thread. A motor-driven hand tool this type (not shown) has two handles, the actual ON / OFF switch on a first handle (not shown) is mounted so that it touches with the Forefinger can be actuated while the second Switch is a safety switch that serves to On / off switching on the first handle only become effective let, though this second "security" switch is actuated by the fact that the operator also the second grip holds.

To such a safety switch is here.

This is, as best seen in Figures 5 and 6 seen, formed by a tube that consists of two half-shells 5 and 6 is composed. The half-shell 5 has inside two mutually spaced, mutually parallel circular surfaces 10, 11 on. she arise on the inside of a ring 15, with which the Half shell 5 in the half-shell 6 and in an in this intended corresponding recess 7 is used is.

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 surface 10th or 11 have a distance of 0.5 to 1.0 mm. between these pins 20 and the surfaces 10 and 11 are then the actual as a foil or board formed capacitive sensor elements or sensors 25, 26 clamped and through the lower surface 7 'of Recess 7 supported. In the simplest case, it can be at the two capacitive sensors 25, 26 to such Act in which a metal layer on a foil is applied flat. Two sensors, like the two here Sensors 25, 26 are provided for safety reasons. The capacity is then influenced by the Handle pipe at any point. Depending on it Then a signal is generated in an evaluation circuit. The sensors 25, 26 are connected to connection wires 30, 31 provided passing through the connection opening 32 in a Cable 33 are guided, with the control device the tool is connected, in which also said Evaluation circuit is provided. The use of a strip-shaped foil makes it possible in a simple way that the sensor spatially over the entire outside touchable area is distributed.

Of course, other types of sensors are also included possible. You just have to meet the requirement that the Touching the handle by an operator at one Any point sufficient to make a change of the Sensor to give emitted signal and so called Function as a safety switch to meet. It come so also inductive sensors in question.

For easier handling, the outer surface of the handle provided with grooves 40 which a non-slip touch enable.

Claims (5)

Handle for a power tool, in particular a power saw, which is formed by a pipe extending over approximately a 3/4 circle of electrically non-conductive material, with a fuse switch, which is released by a sensor, the spatially along the externally graspable region of the tube extends in this, characterized in that the tube by two nested half shells (5, 6) is formed, of which at least one has a flat support member (10, 11), which is also along the ¾ Circle extends and on which a likewise extending over this area planar capacitive sensor (25, 26) is arranged. Handle according to claim 1, characterized in that both half-shells (5, 6) at a distance from one another each have a planar support member (10, 11) arranged thereon with retaining elements and sensors (25, 26). Handle according to claim 1 or 2, characterized in that the support member has an elongate surface (10, 11) spaced in advance from pins (20) and that the strip-shaped sensor (25, 26) between the pins and the surface (10, 11) is clamped. Handle according to one of claims 1, 2 or 3, characterized in that the tube has two for screwing the handle (1) to a tool suitable surfaces (2). Handle according to claim 4 or 5, characterized in that the half-shells spaced from the said support members (10, 11) second support members (20), so that a sensor (25, 26) between the first-mentioned support members (10, 11) and the second support members (20) can be arranged.

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