Measuring and testing – Dynamometers – Responsive to force
Patent
1996-04-24
1998-12-08
Chilcot, Richard
Measuring and testing
Dynamometers
Responsive to force
73756, 73862636, 494771, G01L 100
Patent
active
058472894
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a flexible rubberlike extruded single or multiple cavity profile serving as a sensor receptacle profile made of EPDM, TPE, PVC or similar materials which in different regions thereof may also be co-extruded of different materials and may also possess different degrees of Shore hardness and bulk densities, serving for the accommodation and the protection of pressure activatable sensors, in particular for being installed behind cover panels in automobiles and as a window guidance profile, in particular for automobile windows with U-shaped window guide frames.
This state of the art comprises a wellnigh endless repertoire of profiles having a variety of functions, such as e.g. for sealing, for decoration, for spacing, as well as for pressure activation by hydraulic or pneumatic force applications according to EP 0 421 287 or as safety switches according to DE 4300 434. It is a common feature of all profiles that they have each been conceived for specific application situations and their geometries are designed accordingly. A particular type of profiles includes those which serve for the accommodation and protection of specific function means such as e.g. pressure activatable sensors. Such profiles are of interest in the automobile industry because for product liability reasons considerations are necessary as to how being squashed by electrically operated installations such as window winders, sliding roofs, pulling closed installations e.g. for also doors--e.g. in public conveyance means--can be prevented reliably.
The effectiveness, the operative reliability and thus the usefulness of such squashing protective systems is substantially co-decided by the sensor systems employed, their response, threshold, their local fitting and accommodation, as well as the degree of overlap of the hazardous linear movement paths.
In this context a variety of different systems are already known, such as e.g. profiles made of conductive elastomers, profiles inside which wires have been included by extrusion and infra-red barriers. All systems are, however, to a greater or lesser degree exposed to damage during handling and installation and are not adjustable in relation to different actions which may arise.
Tactile pressure activatable sensors have now become commercially available which are preferably to be employed as a sensor for electrical window winders, electric sliding roofs and a variety of other electrically operated installations in which a squashing action is to be avoided. This type of sensor takes the form of a pressure sensing element, the resistance of which decreases as the applied pressure increases. The pressure sensitivity of the sensor has been optimised for use in manual touch key controls for electronic apparatus and for use in mechanical devices. Such sensors can be adjusted in relation to actions as occur in practice, since the output signal varies in accordance with the sensitivity as a function of the magnitude of the pressure application for which reason the sensor does not merely act as a pure switch (solely having an on/off function) but, when subjected to loading, delivers as an output signal a greater or lesser resistance drop depending on the pressure applied, which subsequently can be further processed electrically. In order to be able to employ such a tactile pressure activatable sensor in an appropriate manner it is however first necessary to accommodate it in an appropriate installation space, ie. an interior which affords to it protection against continuous environmental effects and which permits the performance of the sensor function.
Accordingly a need exists to develop a profile having a maximum enclosing function or which is permanently closed, which is suitable for the accommodation, e.g. the threading thereinto and the accommodation therein of relatively long linearly extending sensors, in particular of such kind as are employed in the automobile industry in sectors where a hazard of being squashed is to be counter-acted and permitti
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Chilcot Richard
Creighton Wray James
Daimler-Benz AG
I.E.E. International Electronics & Engineering S.A.R.L.
Narasimhan Meera P.
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