US3497651A - Miniature electrical switch - Google Patents

Miniature electrical switch Download PDF

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Publication number
US3497651A
US3497651A US754309A US3497651DA US3497651A US 3497651 A US3497651 A US 3497651A US 754309 A US754309 A US 754309A US 3497651D A US3497651D A US 3497651DA US 3497651 A US3497651 A US 3497651A
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US
United States
Prior art keywords
switch
electrical
boot
contact members
body means
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.)
Expired - Lifetime
Application number
US754309A
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English (en)
Inventor
Albert Blatter
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.)
Bendix Corp
Unison Industries LLC
Original Assignee
Bendix Corp
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 Bendix Corp filed Critical Bendix Corp
Application granted granted Critical
Publication of US3497651A publication Critical patent/US3497651A/en
Anticipated expiration legal-status Critical
Assigned to IGNITION PRODUCTS CORPORATION reassignment IGNITION PRODUCTS CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ALLIED-SIGNAL INC.
Assigned to HOUSEHOLD COMMERCIAL FINANCIAL SERVICES, INC. reassignment HOUSEHOLD COMMERCIAL FINANCIAL SERVICES, INC. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: UNISON INDUSTRIES LIMITED PARTNERSHIP
Assigned to UNISON INDUSTRIES LIMITED PARTNERSHIP, 530 BLACKHAWK PARK AVE., ROCKFORD, ILLINOIS 61108, A DE. LIMITED PARTNERSHIP reassignment UNISON INDUSTRIES LIMITED PARTNERSHIP, 530 BLACKHAWK PARK AVE., ROCKFORD, ILLINOIS 61108, A DE. LIMITED PARTNERSHIP ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: IGNITION PRODUCTS CORPORATION
Expired - Lifetime 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

Definitions

  • the electrical switch interface devices In order to be compatible with fluidics and fluidic circuitry as it presently exists and as forseen for the future, the electrical switch interface devices must combine small size with high sensitivity to small pressure changes and have low compression volumes. It is, therefore, an object of this invention to provide an electrical switch combining small size and low compression' volume with high sensitivity to small pressure changes. It is also an object of the present invention to combine these characteristics in a, switch which is reliable, low in cost, and easily assembled.
  • FIGURE 1 shows, in section, an electrical switch made in accordance with the teachings of the present invention. For clarity, the contacts are shown closed without showing compression to the elastomeric member.
  • FIGURE 2 shows, in section view taken along line 22 in FIGURE 1, the fluid operated portion of the electrical switch made according to my invention.
  • the switch made according to my invention has an enclosure body designated generally by 10.
  • the enclosure includes a mounting member 12 and outer housing member 24.
  • the mounting member is adapted for mating with an appropriate connector (not shown) of a fluidic system or the like having at least two pressure levels.
  • this connection is of the push-in variety, but the man skilled in the art will recognize that the mounting member ICE 12 and the form of the connection may be altered within the scope of the invention to suit a particular application.
  • the mounting member 12 has a bore or passage 14 into which is inserted the closed end 16 of the elastomeric member or boot 18.
  • the boot 18 has a generally-annular collar or flange 20 at its open end.
  • An electrical body means comprised of inner housing member 22, epoxy potting 34, switch contact members 26 and 28 and electrical leads 30 and 32 is retained within the outer housing member 24 by crimping of the ends of member 24 so as to compress the collar 20 of elastomeric boot 18 between the mounting member 12 and the electrical body means.
  • the interior of the elastomeric member 18 extending into the interior of bore 14 defines a chamber 25 which is fluid tight due to the compression of the collar 20 between mounting member 12 and the electrical body means.
  • the switch contact members 26 and 28 extend into the chamber 25.
  • the switch contact members 26 and 28 are mutually crimped to the electrical leads 30 and 32 of an electrical output means (not shown) such as a relay or an indicator or the like.
  • the switch contact members 26 and 28 and the electrical leads 30 and 32 are mechanically held in place within the inner housing member 22 by the epoxy potting 34 which also serves to electrically insulate the switch contact members 26 and 28, the electrical leads 30 and 32 and the inner housing 22 from each other.
  • Vent 36 is provided to communicate ambient air pressure through the electrical body means to the chamber 25.
  • Projection 38 on the remote free-end of switch contact member 28 is operative to make contact with switch contach member 26 and permits electrical contact upon minimum movement of the remote free-ends of the switch contact members 26 and 28 while allowing the members 26 and 28 to be spaced substantially farther apart along the major portion of their length. This reduces capacitive coupling between the switch contact members 26 and 28 while providing the switch with improved sensitivity to pressure changes and a relative insensitivity to nonuniformities in the boot 18.
  • FIGURE 2 shows a section view of my switch with the section taken through the projection 38.
  • Boot 18 is shown as having a first lateral dimension which is significantly greater than the second lateral dimension taken perpendicular to the first lateral dimension.
  • the switch contact members 26 and 28 lie substantially parallel to this first lateral dimension and compression or collapse of the boot 18 will succeed in bringing the projection 38 and the freeend of switch contact member 26 into electrical current conducting contact.
  • a preferred direction of collapse is established so that when the fluid pressure on the exterior surface of the boot 18 exceeds the pressure on the interior surface of the boot 18, it will collapse bringing together the contactive ends of the switch contact members 26 and 28.
  • boot 18 is a generally tubular member closed at the insertion end 16.
  • the boot 18 is preferably made of a one-piece elastomeric material selected to be inert and unreactive in the presence of the fluid for which the switch is contemplated. The material selected must also be flexible with the temperature range of switch operation.
  • a preferred direction of collapse will be established.
  • a diaphragm-like switch action is provided to initiate cantilever closure of the contact members in a switch inherently capable of use in locations smaller than those in which a diaphragm switch may effectively be used.
  • the vent 36 serves to permit collapse of the boot 18 without compression of the fluid inside the boot 18 in those systems having operating pressure levels above and below ambient air pressure. Vent 36 will also allow modification of the fluid pressure withinthechamber 25 for those systems which operate entirely above or entirely below ambient air pressure.
  • the contact switch members 26 and 28 are shown separate from the sleeve 16, but they could also be incorporated within the sleeve material in the sleeve molding operation. Upon reduction of the fluid pressure outside of the sleeve, the natural resiliency of the sleeve material will cause it to assume its relaxed position with the inherent resiliency of the contact switch members 26 and 28 being sufficient to separate their contactive free-ends. To prevent arcing and contact welding, an arc suppression means should be incorporated in the circuit with which the switch is associated unless current levels are kept quite low.
  • a pressure sensitive electrical switch comprising:
  • said contact members adapted to establish current conducting contact at a location remote from said electrical body means
  • said boot defining a fluidtight chamber around said contact members; and 7 said contact members and said boot extending away from the electrical body means a substantial distance to allow closure of said contact members by cantilever movement.
  • a pressure sensitive electrical switch comprising:
  • a mounting member adapted for attachment to a fluid system having at least two pressure levels and having a bore in communication with said system
  • said elastomeric member defining a fluidtight chamber within said bore and having a noncircular cross section wherein a first lateral dimension is significantly larger than a second lateral dimension which lies perpendicular to said first lateral dimension thereby establishing a preferred direction of collapse in response to increase in the fluid pressure external to said elastomeric member; a pair of switch contact members extending from the electrical body means into said chamber; and said pair of switch contact members having a pair of contact ends lying in a spaced-apart relationship in the direction ofsaid second lateral dimension.
  • said boot has a first lateral dimension significantly greater than a second lateral dimension which lies perpendicular to said first lateral dimension thereby establishing a preferred direction of compression of said boot.
  • vent means contained within said electrical body mean operative to communicate the interior of said chamber to a region external to the electrical body means.
  • one of said contact members includes a projecting portion remote from said electrical body means and extending toward the other of said switch members to provide reduced travel distance for switch closure.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Push-Button Switches (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
US754309A 1968-08-21 1968-08-21 Miniature electrical switch Expired - Lifetime US3497651A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US75430968A 1968-08-21 1968-08-21

Publications (1)

Publication Number Publication Date
US3497651A true US3497651A (en) 1970-02-24

Family

ID=25034237

Family Applications (1)

Application Number Title Priority Date Filing Date
US754309A Expired - Lifetime US3497651A (en) 1968-08-21 1968-08-21 Miniature electrical switch

Country Status (4)

Country Link
US (1) US3497651A (fr)
DE (1) DE1942210C3 (fr)
FR (1) FR2016036A1 (fr)
GB (1) GB1231688A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4735191A (en) * 1984-12-17 1988-04-05 Musikettle, Inc. Musical teakettle apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4551069A (en) * 1984-03-14 1985-11-05 Copeland Corporation Integral oil pressure sensor

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB405704A (en) * 1933-07-28 1934-02-15 George Taylor An automatic electric battery charging control or indicator
US2238327A (en) * 1939-07-27 1941-04-15 Frank W Jackson Signal or controlling device
US2419942A (en) * 1943-10-18 1947-05-06 Fischer & Porter Co Flow actuated switch
US3254199A (en) * 1962-09-18 1966-05-31 Commercial Factors Ltd Automatic electric fluid heating system
US3369089A (en) * 1966-01-06 1968-02-13 Westport Dev & Mfg Company Inc Displacement transmitting device
US3421124A (en) * 1967-03-17 1969-01-07 Joseph V Kidd Detector switch

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB405704A (en) * 1933-07-28 1934-02-15 George Taylor An automatic electric battery charging control or indicator
US2238327A (en) * 1939-07-27 1941-04-15 Frank W Jackson Signal or controlling device
US2419942A (en) * 1943-10-18 1947-05-06 Fischer & Porter Co Flow actuated switch
US3254199A (en) * 1962-09-18 1966-05-31 Commercial Factors Ltd Automatic electric fluid heating system
US3369089A (en) * 1966-01-06 1968-02-13 Westport Dev & Mfg Company Inc Displacement transmitting device
US3421124A (en) * 1967-03-17 1969-01-07 Joseph V Kidd Detector switch

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4735191A (en) * 1984-12-17 1988-04-05 Musikettle, Inc. Musical teakettle apparatus

Also Published As

Publication number Publication date
GB1231688A (fr) 1971-05-12
DE1942210C3 (de) 1975-02-06
FR2016036A1 (fr) 1970-04-30
DE1942210A1 (de) 1970-02-26
DE1942210B2 (de) 1974-06-12

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Legal Events

Date Code Title Description
AS Assignment

Owner name: IGNITION PRODUCTS CORPORATION

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ALLIED-SIGNAL INC.;REEL/FRAME:005012/0079

Effective date: 19881231

Owner name: HOUSEHOLD COMMERCIAL FINANCIAL SERVICES, INC.

Free format text: SECURITY INTEREST;ASSIGNOR:UNISON INDUSTRIES LIMITED PARTNERSHIP;REEL/FRAME:005012/0090

Effective date: 19890106

AS Assignment

Owner name: UNISON INDUSTRIES LIMITED PARTNERSHIP, 530 BLACKHA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:IGNITION PRODUCTS CORPORATION;REEL/FRAME:005164/0245

Effective date: 19890106