DE20319020U1 - Switching strip for monitoring abutting edges, has elongate switching elements with joint region of insulating tape spaced apart from their spacing region - Google Patents

Abstract

An elongate detector comprises two elongate, flat, spaced-apart switching elements, and an insulation device for insulating the detector from its surroundings. The insulation device includes an insulating tape which is fitted to itself or to a further insulating tape in a joint region. The insulating tape and the joint region extend parallel to the switching elements. The joint region is spaced apart from the switching element spacing region.

Description

The The present invention relates to a safety edge according to the preamble of claim 1. Generic safety edges are used, for example, in connection with window panes or vehicle doors, to prevent trapping of persons.

State of the art

Out DE 43 28 167 a switching strip is known in which two steel strips are arranged one above the other and surrounded by a shrink tube. Such a safety edge is very expensive to manufacture by numerous manual operations. In addition, their contacting requires special, also consuming contact devices.

EP 0 871 182 shows a cable that is wrapped in an insulating layer. However, considerably higher demands on the mechanical load capacity are made on a switching strip. Therefore, the illustrated embodiments are not applicable.

Subject of the invention

A Safety edge according to claim 1 allows easy mass production the switching elements.

A Safety edge according to claim 2 results in a device which is also in Explosive areas can be used.

A Safety edge according to claim 4 also has high, alternating bending loads a very long life.

A Safety edge according to claim 5 or 6 is inexpensive to manufacture and corrosion resistant.

characters

The The following description deals with possibilities for the design the invention. These designs are only to be understood as examples and are made with reference to:

1 Door with safety edge in schematic plan view

2 Enlarged cross section through the first embodiment of a safety edge

3 Enlarged cross section through a second embodiment of a safety edge

description the invention

1 shows a vehicle door 27 , This has a movable glass pane 29 on. Along the closing edge of the glass pane 29 is a safety edge 1 arranged.

Will the glass pane 29 moves upwards and becomes an object between the door 27 and the glass pane 29 clamped, this leads to a force on the safety edge 1 , The safety edge 1 reports this signal to an evaluation device, not shown. This in turn stops the closing movement of the glass.

The safety edge 1 according to 2 has a first and a second switching element 7 . 7 ' on. These are formed from a ribbon-like, metallic flat conductor. They are arranged overlapping each other. The switching elements have a thickness of about 0.1 .mu.m to 1 mm.

Conveniently, they are made of steel or another springy material.

At rest, the switching elements 7 . 7 ' spaced apart. The distance range between them 9 has a variable volume depending on the load condition. For spacing the switching elements 7 . 7 ' is provided that one or more spacer elements 31 between the two switching elements 7 . 7 ' are arranged. This is preferably formed from an elastic, electrically non-conductive rubber or plastic material.

The switching elements 7 . 7 ' and the spacer 31 form the detector in the present embodiment 3 ,

The detector 3 is from an isolation device 11 envelops. The isolation device 11 is in the present embodiment of an insulating tape 13 educated. This extends along the detector 3 and encloses this. The long edges 17 . 17 ' of the insulation tape 13 encounter in a joining area 19 together. The joining of the two longitudinal edges 17 . 17 ' is preferably done by welding. The weld 23 and the joining area 19 also run along the detector and parallel to the switching elements 7 . 7 ' ,

The more sensitive and stiffer joint area 19 is spaced from the distance range 9 arranged to prevent leaks in the weld 23 or to avoid a separation of the joined parts even under bending load. Ideally, the joining area 19 approximately symmetrically at the detector z. B. along a center line of the detector 3 arranged.

The isolation band 13 is preferably made of an electrically insulating thermoplastic Herge provides, such. As polyamide, PET or PEN.

The embodiment of 3 largely corresponds to that of 2 , However, the side edges bump 17 . 17 ' of the insulation tape 13 not on each other, but overlapping. This is the joining area 19 even safer against the penetration of foreign substances (eg air humidity) protected.

In addition to the described embodiments Numerous variations of the invention are conceivable.

For example, instead of a spacer 9 be provided that the insulating tape ( 13 ) is made of an elastic material, and in that the arranged in the spacing region areas of the insulating tape ( 13 ) are formed as a resilient web to the two switching elements 7 . 7 ' at rest from each other. In such an embodiment, the switching elements could 7 . 7 ' serve not only as a capacitor plates, but also or alternatively as contact elements, which make electrical contact with each other at a certain load.

1

Safety Edge

3

detector

5

impact edge

7,7 '

switching elements

9

distance range

11

isolation means

13

insulation tape

15

Surroundings

17.17 '

longitudinal edges

19

joining area

21

Conductive layer

23

Weld

27

vehicle door

29

pane

31

spacer

Claims (6)

Safety edge ( 1 ) for monitoring abutting edges ( 5 ), with an elongated detector ( 3 ) for detecting mechanical forces at an abutment edge ( 5 ), the detector ( 3 ) at least two elongate, flat switching elements ( 7 . 7 ' ) whose bases ( 25 . 25 ' ) substantially one above the other and parallel to each other along the detector ( 3 ) are arranged and between which a distance range ( 9 ) and with an isolation device ( 11 ) for electrically and / or mechanically isolating the detector ( 3 ) from its environment ( 15 ), characterized in that the isolation device ( 11 ) at least one insulating tape ( 13 ) of insulating material, that the insulating tape ( 13 ) on at least one of its longitudinal edges ( 17 . 17 ' ) with itself and / or another insulation tape in a joint area ( 19 ) is joined together that the insulating tape ( 13 ) and the joining area ( 19 ) substantially parallel to the switching elements ( 7 . 7 ' ), and that the joining area ( 19 ) at least for the most part of the distance range ( 9 ) is spaced. Safety edge according to Claim 1, characterized in that the switching elements ( 7 . 7 ' ) are electrically conductive, and that the insulating tape ( 13 ) spaced from the detector ( 3 ) an electrically conductive layer ( 21 ) having. Safety edge according to one of the preceding claims, characterized in that the distance range ( 9 ) has a variable volume and along the switching elements ( 7 . 7 ' ). Safety edge according to one of the preceding claims, characterized in that the joining region ( 19 ) substantially from the distance range ( 9 ) is spaced and / or that the base surfaces of the joining region ( 19 ) and the switching elements ( 7 . 7 ' ) at least partially overlap, in particular that the joining area ( 19 ) on at least one of the switching elements ( 7 . 7 ' ) is present. Safety edge according to one of the preceding claims, characterized in that the insulating strip ( 13 ) in the joining area ( 19 ) is welded or glued and preferably one along the joining region ( 19 ) continuous weld ( 23 ) or gluing. Safety edge according to one of the preceding claims, characterized in that the longitudinal edges ( 17 . 17 ' ) in the joining area ( 19 ) abut each other or each other. overlap.