US3527906A - Centrifugal switch - Google Patents
Centrifugal switch Download PDFInfo
- Publication number
- US3527906A US3527906A US831144A US3527906DA US3527906A US 3527906 A US3527906 A US 3527906A US 831144 A US831144 A US 831144A US 3527906D A US3527906D A US 3527906DA US 3527906 A US3527906 A US 3527906A
- Authority
- US
- United States
- Prior art keywords
- mass
- case
- switch
- header
- spring
- 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
Links
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 10
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 5
- 229910052737 gold Inorganic materials 0.000 description 5
- 239000010931 gold Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229910052759 nickel Inorganic materials 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229910000833 kovar Inorganic materials 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 208000003251 Pruritus Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/06—Switches operated by change of speed
- H01H35/10—Centrifugal switches
Definitions
- a miniature centrifugal switch of a rugged shockproof construction is provided for triggering ballistic fuses of projectiles.
- the switch comprises a metal cylindrical case mounted for revolving movement about an axis parallel to its longitudinal axis.
- a movable conductive mass serving also as a switch contact is mounted on an end wall of the case through a helical spring to permit the mass to be deflected sidewise by centrifugal force.
- the spring is pretensioned-i.e., wound tightly on itselfso that the mass is not deflected by increasing centrifugal force until a predetermined rotational speed is reached about an axis parallel with the central longitudinal axis through the helical spring and mass.
- An object of the present invention is to provide a novel and economical design of a centrifugal switch which meets these rigid requirements.
- FIG. l is a view showing the mounting of the present centrifugal switch device relative to its rotational axis
- FIG. 2 is a diametrical sectional view of the switch device taken along its longitudinal axis
- FIG. 3 is a cross sectional view taken on the line '3 3 of FIG. 2;
- FIG. 4 is a plot of contact-mass deflection versus centrifugal force during the revolving of the switch.
- the present centrifugal switch device has a cylindrical case comprising a cylindrical cup 11 formed by deep drawing as of nickel-plated copper.
- the cup is formed during the drawing Operation with flanged edge 11a at its open end.
- the size of the case is approximately .2" long and .21" in diameter.
- the case has a shallow cup-shaped header 12 of Kovar metal (nickeliron alloy) fitted into the open end of the cup 11.
- the header has a peripheral radially extending rim 13 which is seated against the rim 11a of the cup 11 and is welded or braised thereto.
- the central portion of the header is formed with an annular inwardly extending flange 14 forming a central cylindrical opening 15.
- a rst terminal pin 16 extends centrally through the opening 15 and is sealed to the header by a glass medium 17.
- a second terminal pin 18 is braised at 19 to the header 12 and encased at its tip also by the glass medium 17
- the header 12 constitutes a supporting base for the internal parts of the switch, permitting the switch therefore to be fully assembled on the header before the latter is mounted on and braised to the cup 11.
- the switch com- 3,527,906 Patented Sept. 8, 1970 ice prises a cylindrical mass 20 having an axial opening 21 extending therethrough and having a cylindrical extension 22 at its outer end, which is of reduced diameter equal to that of the flange 14 on the header.
- the mass 20 has a clearance spacing on all sides from the case 10 and occupies about 50% of the internal space in the case.
- the mass is made of any suitable material having the desired specific gravity, and is nickel and gold plated to provide it with good surface conductivity, since it serves also as a contact of the switch, as will appear.
- a helical spring 23 is pressed at one end onto the flange 14 and at the other end onto the extension 22 of the mass 20, and may be braised at both ends to these parts.
- This spring provides a yieldable support on the case for the contact mass 20.
- the spring convolutions are wound tightly onto each other to pretension the spring so that it tends to hold the mass rigidly in centered relation to the case.
- a sidewise force on the mass lateral of the case may bend the spring sidewise allowing a sidewise deflection of the mass when the force exceeds a critical value.
- the central pin 16 extends longitudinally through the mass 20 with a clearance spacing from the wall of the axial opening 21.
- This pin has a frustoconical tip 24 at its end which is at a uniform spacing from the surrounding wall 25 of the opening 21.
- the terminal pin 16 is preferably made of Kovar and the tip 24 thereof is nickel and gold plated since it serves as a contact of the switch. When the switch is closed electrical connection is made between the terminal pins 16 and 18 ⁇ via the header 12, spring 23 and contact mass 20.
- the use of nickel and gold plating of the portions forming the switch contacts assures very low resistance between the contacts under light pressure and protects the contact areas from film formations which would increase 'the contact resistance.
- the case 10 is evacuated of air and is then filled with inert nitrogen preferably also with some helium for leak detection purposes.
- Low electrical resistance from the contact mass 20 to the terminal pin 18 is achieved by using a stainless steel spring 23 which is copper flashed and also nickel and gold plated and by both nickel and gold plating the flange 14 on the header 12.
- the present switch device is mounted with its base end flat against a support 26.
- the terminal pins 16 and 18 extend through the support-which may be a printed circuit board--and are secured thereto as by soldering. Additionally, the case may be secured to the board as by an epoxy resin 27.
- the support 26 is considered as having a rotational freedom of movement about an axis 28 parallel to the longitudinal axis 29 through the switch device. The spacing of the rotational axis 28 from the longitudinal axis 29 is approximately .5.
- the switch contacts are to remain open during revolving movement of the switch device about the axis 28 until the speed reaches 1800 rpm. and the contacts are to reopen .when the rotational speed falls about r.p.m. below this value.
- the switch is to be capable of repeating this Operation after being subjected to a mechanical shock of 13,000 Gs; also, the switch must be capable of withstanding storage up to ten years duration under all environments of temperatures from .80 F. to 170 F.
- a centrifugal switch comprising a metal case mounted: for revolving .movement Vabout Va givenV 'rota'-V tional axis, a mass in said case spaced from the walls thereof, a yieldable support in said case for said mass comprising a pretensioned helical spring secured at one end to said case and at the other end to said mass on a medial axis through said case parallel to said given rotational axis whereby said mass is deflected with side- Wise beinding of said helical spring when the centrifugal force of the mass reaches a critical value determined by the pretensioning of said spring, a first terminal pin insulatedly mounted in a wall of said case and having an end contact at said medial plane coacting wiith a contact area on said mass forming an electric switch operable by said deflection of the mass, and a second terminal pin on said case for said switch connected to said contact area via said case, helical spring and conductive surface of said mass.
- centrifugal switch set forth in claim 1 wherein said case comprises a cylindrical cup and a header fitted in the open end of said cup and welded thereto, and wherein said helical spring iis secured to said header.
- said mass is a conductive body of cylindrical sha-pe supported with clearance on all sides from said case, said mass having a reduced diameter portion on one end wall extending toward said header and said header having an opening surrounded by a rim flange of te diameter of said reduced portion of said mass, and said helical spring being fitted onto and secured to said reduced diameter portion at one end of said rim flange at the other end.
- a centrifugal switch having a metal cylindrical case mounted for revolving movement about a given rotational axis parallel to the longitudinal axis of the case, said case comprising a cylindrical cup provided with a rim flange and a metal header fitted into the open end of said cup against said rim flange and joined in sealed relation thereto, said header having a central opening, a cylindrical conductive mass in said case having an axial opening, a helical spring mounted at one end on an end wall of said case and secured at the other end to said mass for supporting said mass in a centered position in said case spaced from the walls thereof, said spring being pretensioned to constitute a rigid column for holding said mass fixed in said case until the centrifugal force on the mass reaches a critical value, a first terminal pin extending through said opening of said header and into said axial opening of said mass in spaced relation thereto, sai-d pin being hermetically sealed to said header and having an end portion forming a switch Contact coacting with the surrounding contact wall
Description
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US83114469A | 1969-06-06 | 1969-06-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3527906A true US3527906A (en) | 1970-09-08 |
Family
ID=25258377
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US831144A Expired - Lifetime US3527906A (en) | 1969-06-06 | 1969-06-06 | Centrifugal switch |
Country Status (1)
Country | Link |
---|---|
US (1) | US3527906A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3649787A (en) * | 1970-08-14 | 1972-03-14 | Raytheon Co | Disturbance sensitive switch |
US3731022A (en) * | 1971-11-12 | 1973-05-01 | Alcotronics Corp | Inertia type switch with coaxial conductive springs |
US4025744A (en) * | 1976-03-29 | 1977-05-24 | Litton Systems, Inc. | Shock and vibration sensitive switch |
US4916266A (en) * | 1989-06-08 | 1990-04-10 | Aerodyne Controls Corporation | Miniature omnidirectional instantly responsive impact switch |
WO1990010301A1 (en) * | 1989-02-21 | 1990-09-07 | Automotive Technologies International, Inc. | Short-travel mechanical crash sensor |
US20080095646A1 (en) * | 2004-05-20 | 2008-04-24 | Matsushita Electric Industrial Co., Ltd. | Electrically Driven Compressor Integral with Inverter Device, and Vehicle Air Conditioner Where the Compressor is Used |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1996848A (en) * | 1932-01-20 | 1935-04-09 | American Flyer Mfg Company | Centrifugal electric switch |
US2936352A (en) * | 1953-12-01 | 1960-05-10 | Roger W Patterson | Centrifugal switch |
-
1969
- 1969-06-06 US US831144A patent/US3527906A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1996848A (en) * | 1932-01-20 | 1935-04-09 | American Flyer Mfg Company | Centrifugal electric switch |
US2936352A (en) * | 1953-12-01 | 1960-05-10 | Roger W Patterson | Centrifugal switch |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3649787A (en) * | 1970-08-14 | 1972-03-14 | Raytheon Co | Disturbance sensitive switch |
US3731022A (en) * | 1971-11-12 | 1973-05-01 | Alcotronics Corp | Inertia type switch with coaxial conductive springs |
US4025744A (en) * | 1976-03-29 | 1977-05-24 | Litton Systems, Inc. | Shock and vibration sensitive switch |
WO1990010301A1 (en) * | 1989-02-21 | 1990-09-07 | Automotive Technologies International, Inc. | Short-travel mechanical crash sensor |
US4916266A (en) * | 1989-06-08 | 1990-04-10 | Aerodyne Controls Corporation | Miniature omnidirectional instantly responsive impact switch |
US20080095646A1 (en) * | 2004-05-20 | 2008-04-24 | Matsushita Electric Industrial Co., Ltd. | Electrically Driven Compressor Integral with Inverter Device, and Vehicle Air Conditioner Where the Compressor is Used |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ARMTEC INDUSTRIES, INC., MASSACHUSETTS Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:MARYLAND NATIONAL INDUSTRIAL FINANCE CORPORATION;REEL/FRAME:003973/0306 Effective date: 19810603 Owner name: ARMTEC INDUSTRIES, INC. Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:MARYLAND NATIONAL INDUSTRIAL FINANCE CORPORATION;REEL/FRAME:003973/0306 Effective date: 19810603 |
|
AS | Assignment |
Owner name: BL DEVELOPMENT CORP.MANCHESTER MUNICIPAL AIRPORT, Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ARMTEC INDUSTRIES, INC.;REEL/FRAME:004030/0773 Effective date: 19820528 Owner name: ARMTEC INDUSTRIES, INC. Free format text: CHANGE OF NAME;ASSIGNOR:BL DEVELOPMENT CORP.;REEL/FRAME:004030/0766 Effective date: 19820528 |