DE8337596U1 - CONTROL HANDLE, ESPECIALLY FOR THE REMOTE CONTROL OF HYDRAULICALLY DRIVED DEVICES - Google Patents

Description

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bso Steuerungstechnik GmbH

Industriestrasse December 20, 1983

6603 Sulzbach / Saar lawyer file M-6098

Control handle, especially for remote control of hydraulically powered devices

For remote control of hydraulically operated devices, for example Dredging, a control handle is provided, when actuated, for example, the internal combustion engine of the device can be set to a desired speed. This adjustment can be made by swiveling the control handle take place. On the other hand, if the control handle is released, it is desirable that to save fuel the internal combustion engine is automatically decelerated to idle speed.

For this purpose, two contact tracks can be provided on the surface of the control handle, which are insulated from one another by plastic. If the control handle is grasped by the hand, this establishes a connection between the two contact tracks and, due to the conductivity of the hand, the resistance between the two contact tracks is greatly reduced. The reduction in resistance is determined in an electronic evaluation circuit and used to operate a switch.

When you touch the control handle, the switch is operated so that the internal combustion engine can be accelerated to the desired speed by operating the handle

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can, while one in the Auewerteechaltung in addition provided time delay ensures that about ten seconds after releasing the handle, the switching function is carried out, with which the idle speed of the Internal combustion engine is adjusted. With the time delay it is avoided that if the button is only released for a short time the handle is used to set the idle speed.

The object of the invention is to design the control handle so that the reliability the switching when touching and releasing the control handle is improved and also the design of the handle is simplified.

According to the invention, the object is achieved by the features specified in the claims, in particular by the Features of claim 1 solved.

This has the advantage that the switching function of the control handle depends on the conductivity of the human Skin is largely independent. This is especially the case when the control handle is used in particularly dry areas or by people with or with very dry skin Gloves are used.

Thus, according to the invention, the conductor tracks are in the form of two

Comb-like nested capacitor plates on one Foil provided, over which an insulating sleeve is pushed so that the switching function through the cable change in capacitance, which occurs when the control handle is gripped by the human hand causes such a large change in capacity, even with gloves on or in very dry areas, that of the evaluation circuit to the switching function of the switch is reliably controlled.

The plastic sleeve also makes the sensitive

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Conductor tracks on the film are protected from mechanical damage and contamination.

Furthermore, the construction of the control handle is significantly simplified if it is made hollow so that the evaluation circuit can be inserted directly inside the handle. So that the handle can be supplied complete with evaluation circuit and switching function, whereby the connection is only made via a cable to a voltage source and to the element to be actuated / the e.g. one in the fuel line arranged valve or relay, etc. is.

An exemplary embodiment of the invention is explained in more detail below with reference to the drawing. It shows:

Figure 1 shows a partially sectioned control handle and

Figure 2

a partial view of the handle with the wound carrying the capacitor tracks Foil.

To the surface 10 of a made of insulating material A flexible film 12 is placed around the control handle 11, the conductor tracks 14 on the outside and 15 wears, which are made of applied copper layers in a known manner.

From Figure 2 it can be seen that the conductor tracks 14 and 15 are each designed in the manner of a comb, the backs of which are parallel to one another in the longitudinal axis of the handle run and proceed from the prongs, the prongs belonging to the conductor tracks 14 and 15 at a distance are arranged transversely to the longitudinal axis of the handle on its circumference and are plugged into one another in a comb-like manner, without them touching each other.

A thin, closed plastic sleeve is pushed over the film 12. The hand that grips the control handle when it is operated acts as a dielectric or KoppeIflache and causes a low capacity changes tion between the conductor tracks 14 and 15, respectively, by a corresponding evaluation circuit is recognized and evaluated to generate a switching signal.

The evaluation circuit is on a plate 20 made of Iso-

material arranged in the hollow interior of the Handle is housed. For this purpose, opposing grooves 19 are provided on the inner wall 18 of the handle, into which the plate 20 is inserted. The upper The opening of the handle is closed with a cover 22.

The connection of the conductor tracks 14 and 15 with corresponding connections on the plate 20 does not take place in FIG illustrated way. A cable is connected to the plate 20 and passes through a hole in the control handle is led to the outside. It's a three core cable from which two cores to the voltage source connected while the third wire carries the switching signal. The evaluation circuit is like this powerful that, for example, a switching valve for setting the idle speed of an internal combustion engine machine controlled directly with a maximum of one ampere can be.

This power output is also short-circuit proof. Furthermore, the pick-up and drop-out delays can be influenced within wide limits.

The response sensitivity can be adjusted using a trimming potentiometer.

Claims (4)

Protection claims: 1. Control handle, especially for remote control of hydraulic powered devices, with arranged on the surface of the handle made of electrical insulating material Conductor tracks for connection to a voltage source and an electronic evaluation circuit, thereby characterized in that the conductor tracks (14,15) in Form of two independently arranged capacitor plates are provided on a flexible film (12) which is wrapped around the handle and over the an insulating sleeve (16) is pushed. 2. Control handle according to claim 1, characterized in that the capacitor plates are designed like a comb and the teeth of the combs parallel to one another and on the circumference your to the longitudinal axis of the handle in aisstand from each other. 3. Control handle according to claim 1 or 2, characterized in that the handle is hollow and inside of the handle, the evaluation circuit is housed. 4. Control handle according to claim 3, characterized in that that the components of the evaluation circuit are arranged on a circuit board (18) which is in longitudinal grooves on both sides (20) can be pushed into the inner wall of the handle.