GB2141585A - Pressure switch - Google Patents
Pressure switch Download PDFInfo
- Publication number
- GB2141585A GB2141585A GB08234458A GB8234458A GB2141585A GB 2141585 A GB2141585 A GB 2141585A GB 08234458 A GB08234458 A GB 08234458A GB 8234458 A GB8234458 A GB 8234458A GB 2141585 A GB2141585 A GB 2141585A
- Authority
- GB
- United Kingdom
- Prior art keywords
- contact
- pressure switch
- pressure
- diaphragm
- moving contact
- 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- Withdrawn
Links
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
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Switches Operated By Changes In Physical Conditions (AREA)
- Push-Button Switches (AREA)
Abstract
A pressure switch mounted on a printed circuit board comprises a movable contact 4 operable by a pressure-sensitive diaphragm 7 and a fixed contact 12 adjustable by a ranging screw 6. <IMAGE>
Description
SPECIFICATION
Medium to low range, printed circuit board
mounted, pressure switch with ranging fa
cility.
The device shall comprise of an electrical
contact actuated directly by a pressure being
applied on a diaphragm, housed in a plastic
moulding with integral post type electrical
contacts serving as fixing and contact to the circuit board.
1. The electrical contact will comprise of two components
i) pressure contact
ii) zero spring.
They will be of the slow moving type contact, gold plated or similar depending upon
intended duty and life.
2. The electrical circuit will be made by a force being applied to the pressure contact from a diaphragm, as the pressure on the positive side of the diaphragm increases the switch gap closes.
3. The switch point can be adjusted by means of a ranging screw which acts on the zero spring (one half of the contact). By varying the tension on the zero spring, the contact gap can be adjusted giving an effective means of set point switching.
4. The contacts, diaphragm and ranging screw shall be mounted in a two part plastic housing crimped together by the two contact posts on low pressure range and by four contact posts on the higher ranges.
5. Exact ranges will be determined by commercial requirements. The switching point will be adjustable between 0 and 100% of the range. The anticipated ranges will be thus:
Low 0-10" wg
0-50" wg
0-100 wg
High 0-250 wg
To maximum of: 0-150 psi.
A sub minature pressure switch compatible with modern printed circuit board manufacture and assembly techniques comprising of the following novel features:
1. A contact, by virtue of its design, capable of being manufactured to provide a known spring rate. Adjustable during manufacture by section and width of cutouts. See
Drawing 005 detail 'A' and 'B'.
2. A pressure switch of subminature dimensions capable of being soldered directly to electrical printed circuit boards.
3. To provide a method of sealing, by clinching both top and bottom mouldings and compressing the anular of the diaphragm, to create a combined seal across both positive and negative chambers.
4. A staked method of construction by driving pins through the lower moulding, into undersize holes in the contact and press-fitting
into the top moulding.
5. A pressure switch capable of manufacture with dual-in-line conductor legs suitable for mounting in 0. 1" matrix circuit boards.
6. The ability to transduce a pressure signal directly on a printed circuit board.
7. A method of providing an adjustable switch point setting, by a single screw acting on the zero plate.
CLAIMS (2 Jul 1984)
1. 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 connected to a first conductor leg, and a static contact cooperable with the said moving contact and connected to a second conductor leg, the said moving contact being 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.
2. 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 integrally formed with a first conductor leg, and a static contact co-operable with the said moving contact and integrally formed with a second conductor leg, the said moving contact being 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.
3. A pressure switch as claimed in claim 1 or 2, in which the diaphragm bears directly upon the moving contact.
4. A pressure switch as claimed in claim 1, 2 or 3, in which the effective position of the static contact is adjustable by means of a setting screw adapted resiliently to deform a portion of the static contact towards the moving contact.
5. A pressure switch as claimed in claim 1, 2, 3 or 4, comprising a two part housing, in which the parts of the housing are crimped together with a periphery of the diaphragm trapped between them.
6. A pressure switch as claimed in claim 5, in which the diaphragm has a marginal bead which is received in a matching recess in one of the housing parts.
7. A pressure switch as claimed in claim 6, in which the marginal bead is annular.
8. A sub miniature pressure switch substantially as hereinbefore described with reference to the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (8)
1. 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 connected to a first conductor leg, and a static contact cooperable with the said moving contact and connected to a second conductor leg, the said moving contact being 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.
2. 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 integrally formed with a first conductor leg, and a static contact co-operable with the said moving contact and integrally formed with a second conductor leg, the said moving contact being 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.
3. A pressure switch as claimed in claim 1 or 2, in which the diaphragm bears directly upon the moving contact.
4. A pressure switch as claimed in claim 1, 2 or 3, in which the effective position of the static contact is adjustable by means of a setting screw adapted resiliently to deform a portion of the static contact towards the moving contact.
5. A pressure switch as claimed in claim 1, 2, 3 or 4, comprising a two part housing, in which the parts of the housing are crimped together with a periphery of the diaphragm trapped between them.
6. A pressure switch as claimed in claim 5, in which the diaphragm has a marginal bead which is received in a matching recess in one of the housing parts.
7. A pressure switch as claimed in claim 6, in which the marginal bead is annular.
8. A sub miniature pressure switch substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08234458A GB2141585A (en) | 1982-12-03 | 1982-12-03 | Pressure switch |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08234458A GB2141585A (en) | 1982-12-03 | 1982-12-03 | Pressure switch |
Publications (1)
Publication Number | Publication Date |
---|---|
GB2141585A true GB2141585A (en) | 1984-12-19 |
Family
ID=10534710
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08234458A Withdrawn GB2141585A (en) | 1982-12-03 | 1982-12-03 | Pressure switch |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2141585A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2430807A (en) * | 2005-09-28 | 2007-04-04 | Alan Roger Harper | Pressure switches |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1453612A (en) * | 1973-01-23 | 1976-10-27 | Gardom & Lock Ltd | Differential pressure switch arrangements |
GB1537858A (en) * | 1975-03-04 | 1979-01-04 | Wabco Westinghouse Gmbh | Pressure medium actuated electric switch |
GB2003324A (en) * | 1977-08-27 | 1979-03-07 | Bosch Siemens Hausgeraete | Fluid pressure actuated switch |
GB2020908A (en) * | 1978-05-15 | 1979-11-21 | Therm O Disc Inc | Snap disc operated pressure switch |
-
1982
- 1982-12-03 GB GB08234458A patent/GB2141585A/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1453612A (en) * | 1973-01-23 | 1976-10-27 | Gardom & Lock Ltd | Differential pressure switch arrangements |
GB1537858A (en) * | 1975-03-04 | 1979-01-04 | Wabco Westinghouse Gmbh | Pressure medium actuated electric switch |
GB2003324A (en) * | 1977-08-27 | 1979-03-07 | Bosch Siemens Hausgeraete | Fluid pressure actuated switch |
GB2020908A (en) * | 1978-05-15 | 1979-11-21 | Therm O Disc Inc | Snap disc operated pressure switch |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2430807A (en) * | 2005-09-28 | 2007-04-04 | Alan Roger Harper | Pressure switches |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |