EP0169280A1 - Druckschalter - Google Patents

Druckschalter Download PDF

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Publication number
EP0169280A1
EP0169280A1 EP84305034A EP84305034A EP0169280A1 EP 0169280 A1 EP0169280 A1 EP 0169280A1 EP 84305034 A EP84305034 A EP 84305034A EP 84305034 A EP84305034 A EP 84305034A EP 0169280 A1 EP0169280 A1 EP 0169280A1
Authority
EP
European Patent Office
Prior art keywords
moving contact
contact
pressure switch
diaphragm
switch according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP84305034A
Other languages
English (en)
French (fr)
Inventor
Roger Bernard John
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AB Electronic Components Ltd
Original Assignee
AB Electronic Components Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AB Electronic Components Ltd filed Critical AB Electronic Components Ltd
Priority to EP84305034A priority Critical patent/EP0169280A1/de
Publication of EP0169280A1 publication Critical patent/EP0169280A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/34—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by diaphragm

Definitions

  • This invention relates to pressure-operated electrical switches of the type having a static contact co-operable with a moving contact which is operated by a flexible diaphragm.
  • Such switches are known in the art, and typical examples are to be found in GB-A-1537858 and GB-A-2020908.
  • GB-A-1537858 shows the use of a metal diaphragm to actuate the moving contact, and while it is stated to be a compact device, it is apparently intended for use in vehicle brake systems, where pressures are high and tolerances are not particularly tight. Also, the contact arrangements do not seem to lend themselves to direct application to printed circuit boards.
  • GB-A-2020908 shows an arrangement in which the diaphragm operates through a snap disc and a switch bumper onto the moving contact. Such an arrangement is not particularly suitable for sub miniature circuitry, and the pressure to which the switch is snesitive is determined by the ratings of the snap disc and the diaphragm.
  • the moving contact is spot welded onto a terminal, and its flexing is controlled to some extent by the provision of an arcuate cut out partially encircling the spot weld.
  • a sub-miniature pressure switch for use with a printed circuit board, comprising a pressure chamber having one wall defined by a flexible diaphragm bearing upon a flexible and resilient moving contact electrically connected to a first conductor leg, and a static contact co-operable with the said moving contact and connected to a second conductor leg, characterised in that the said moving contact is arranged to flex about a hinge line at least partially defined by at least one elongate cutout in the contact material, the section and width of the said cutout(s) being chosen to impart a desired spring rate to the moving contact.
  • the moving contact may be manufactured in a number of models, giving a'choice of cutout pattern, and the required cutout pattern is chosen in accordance with the intended use of the switch, and particularly the range of pressures it will meet in operation.
  • the moving and static contacts are preferably integrally formed with the first and second conductor legs respectively, and the diaphragm should bear directly upon the moving contact for compactness.
  • the cutout will normally be rectilinear.
  • the effective position of the static contact may be adjustable by means of a setting screw adapted resiliently to deform a portion of the static contact towards the moving contact.
  • the switch conveniently comprises a two part housing, in which the parts of the housing are crimped together with a periphery of the diaphragm trapped between them by means of a marginal bead received in a matching recess in one of the housing parts.
  • FIGS. 1 and 2 show a housing having a base part 1 and a cover part 2, both of suitable insulating plastics material.
  • a diaphragm 3 is trapped between the housing parts 1 and 2 by means of a marginal annular bead 4 received in a conforming recess 5 in the part 2 (see also figure 7).
  • the housing part 2 defines, with the diaphragm 3, a pressure chamber 6 connected to a duct 7 (the entrance to which is shown offset by 90° in figures 2 and 3).
  • the housing part 1 defines, also with the diaphragm 3, a contact chamber 8 (see also figure 6), which may also have a pressure conduit 9.
  • Within the contact chamber 8 there are located static and moving contacts 11 and 12 respectively, each of slow moving spring metal, which may be gold or otherwise plated as required.
  • An adjusting screw 13 for the static contact 11 is also illustrated.
  • the contacts 11 and 12 are integral with conductor legs 14 and 15 respectively, and reference to figures 4 and 5 will show more detail of the constructions.
  • the conductor legs are designed for compatibility with modern printed circuit boards so as to be soldered or fitted thereto. In particular, a dual-in-line arrangement is envisaged.
  • the blank of figure 4 is permanently bent along the line shown dotted at 15b to form the angles 15a.
  • An intermediate portion 16 is used to mount the component in the housing, and the moving contact 12 itself is connected to the intermediate portion 16 by a neck 17 which is provided with elongate rectilinear cutouts 18 which define a hinging or pivot line, and the location and dimensions of the cutouts' 18 are so chosen that a predetermined spring rate is given to the moving contact 12. It is envisaged that movong contacts with a number of different configurations of cutouts 18 will be manufactured, and the mbving contact with the particular configuration required for a given application will be incorporated during assembly.
  • the blank of figure 5 is permanently bent along the lines shown dotted at 21, 22 and 23 to form the angles 21a, 22a and 23a respectively.
  • An anchoring intermediate portion is shown at 24, and the static contact itself is shown as having a centre zone 25 which acts as the contact zone and is displaceable by means of the adjusting screw 13 (see figure 2).
  • the centre zone is defined by an elongate arcuate cut out 26 leaving a short hinging zone 27.
  • the intermediate zones 16 and 24 are provided with apertures 16a and 24a which are engaged by contact posts 16b and 24b on the housing part 1 when the switch is assembled.
  • the contact posts 16b and 24b are received in holes 16c and 24c respectively in the housing part 2.
  • the two housing parts 1 and 2 are crimped together by any suitable means, with the diaphragm trapped sealingly between them.
  • An excess pressure in chamber 6 will urge the diaphragm 3 upwards against the moving contact 12, which will flex, against the resilient resistance to hinging, about its hinging line defined by the cutouts 18 and move towards the static contact 11, and particularly the zone 25 thereof, as may be best seen in figure 2.
  • the actual position of the zone 25 may be varied by the adjusting screw 13 to set the amount of hinging of the moving contact 12 required to make the switch.
  • the minimum pressure differential required to achieve this movement is determined by the spring rate of the moving contact 12, which itself depends on the arrangement of the cutout(s) 18.
  • Figure 3 shows an arrangement in which the contacts co-operate with separate conductor legs 31 which pass through and crimp the housing.
  • Figure 3 is partially in section through one of these conductor legs, and shows another of them in elevation.
  • a maximum range would be about 0 to 150 pounds per square inch (10130mb).

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
EP84305034A 1984-07-24 1984-07-24 Druckschalter Withdrawn EP0169280A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP84305034A EP0169280A1 (de) 1984-07-24 1984-07-24 Druckschalter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP84305034A EP0169280A1 (de) 1984-07-24 1984-07-24 Druckschalter

Publications (1)

Publication Number Publication Date
EP0169280A1 true EP0169280A1 (de) 1986-01-29

Family

ID=8192701

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84305034A Withdrawn EP0169280A1 (de) 1984-07-24 1984-07-24 Druckschalter

Country Status (1)

Country Link
EP (1) EP0169280A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999038182A1 (en) * 1998-01-26 1999-07-29 Miller Edge, Inc. Pressure responsive switch and method of making same

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1590877A1 (de) * 1966-02-11 1970-06-18 Elektronische Rechenmasch Ind Pneumatisch-elektrischer Wandler
US3519773A (en) * 1968-08-28 1970-07-07 Berg Mfg & Sales Co Dual-throw switch
FR2030808A5 (de) * 1969-07-14 1970-11-13 Bosch
FR2247801A1 (de) * 1973-10-10 1975-05-09 Europe Mfg Trust
FR2262392A1 (de) * 1973-02-22 1975-09-19 Whiteing Roland
FR2401504A1 (fr) * 1977-08-27 1979-03-23 Bosch Siemens Hausgeraete Interrupteur electrique a pression
US4410776A (en) * 1981-03-16 1983-10-18 General Electric Company Control device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1590877A1 (de) * 1966-02-11 1970-06-18 Elektronische Rechenmasch Ind Pneumatisch-elektrischer Wandler
US3519773A (en) * 1968-08-28 1970-07-07 Berg Mfg & Sales Co Dual-throw switch
FR2030808A5 (de) * 1969-07-14 1970-11-13 Bosch
FR2262392A1 (de) * 1973-02-22 1975-09-19 Whiteing Roland
FR2247801A1 (de) * 1973-10-10 1975-05-09 Europe Mfg Trust
FR2401504A1 (fr) * 1977-08-27 1979-03-23 Bosch Siemens Hausgeraete Interrupteur electrique a pression
US4410776A (en) * 1981-03-16 1983-10-18 General Electric Company Control device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999038182A1 (en) * 1998-01-26 1999-07-29 Miller Edge, Inc. Pressure responsive switch and method of making same
US6040536A (en) * 1998-01-26 2000-03-21 Miller Edge, Inc. Pressure responsive switch and method of making same

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE DE FR GB IT NL

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19860930

RIN1 Information on inventor provided before grant (corrected)

Inventor name: JOHN, ROGER BERNARD