EP 0044922 B1 19840118 - MEMBRANE SWITCHING ELEMENT TO ACTUATE AN INDICATOR
Title (en)
MEMBRANE SWITCHING ELEMENT TO ACTUATE AN INDICATOR
Publication
Application
Priority
DE 3028858 A 19800730
Abstract (en)
[origin: EP0044922A1] 1. A diaphragm control element for the actuation of a differential-pressure controlled device indicating the excessive contamination of an intake-air filter of an internal-combustion engine (1) and comprising a diaphragm (12) which consists of an elastic material and which is clamped, with its circumferential bead (13), in a housing (9, 10) and separates this housing into two chambers (14, 15) and, in the centre, is hinged to a spring-loaded control rod (19) which is actuatable perpendicularly to the clamping plane and which, if there is a difference in the pressure between the two chambers (14, 15), follows the displacement of the centre of the diaphragm, which results therefrom, with the internal circumferential bead (18) and, if a predetermined pressure differential is exceeded, brings about an indication, characterised by the following features a) the diaphragm (12) is plate-shaped, and in its relaxed state frusto-conical, and is installed in such a way that, if there is no pressure differential between the chambers (14, 15), it is in its end position (12 in Fig. 2) that is opposite to its relaxed end position of rest (12 in Fig. 3) and, if the pressure differential increases, moves, while displacing its centre, with the internal circumferential bead (18) through the clamping plane of its external circumferential bead (13), and while passing through a labile intermediate position, towards its relaxed end position (12 in Fig. 3), b) the spring force (22, 25) applied to the diaphragm (12) has been designed to be such that, at the pressure differential at the exceeding of which the control rod (19) is intended to trigger an indication, the diaphragm (12) is in the labile intermediate position, from which it heads for its relaxed end position of rest (12 in Fig. 3) if the pressure differential continues to increase, due to the support of the potential energy which is then released and is stored in it, c) the control rod (19) hinged to the diaphragm (12) actuates an electric contact (26, 31) to indicate the exceeded preset pressure differential.
IPC 1-7
IPC 8 full level
F02M 35/08 (2006.01); F02M 35/09 (2006.01)
CPC (source: EP)
F02M 35/09 (2013.01)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0044922 A1 19820203; EP 0044922 B1 19840118; DE 3028858 A1 19820218; DE 3161947 D1 19840223
DOCDB simple family (application)
EP 81104351 A 19810605; DE 3028858 A 19800730; DE 3161947 T 19810605