US3272943A - Electric shaver control assembly - Google Patents

Electric shaver control assembly Download PDF

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Publication number
US3272943A
US3272943A US360312A US36031264A US3272943A US 3272943 A US3272943 A US 3272943A US 360312 A US360312 A US 360312A US 36031264 A US36031264 A US 36031264A US 3272943 A US3272943 A US 3272943A
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US
United States
Prior art keywords
members
electric
control assembly
bimetal
contacts
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
US360312A
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English (en)
Inventor
Trouilhet Maurice Mari Achille
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.)
CALOR APP ELECTRO DOMESTIQUES
CALOR APPAREILS ELECTRO-DOMESTIQUES
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CALOR APP ELECTRO DOMESTIQUES
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Publication of US3272943A publication Critical patent/US3272943A/en
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Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/60—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism cartridge type, e.g. screw-in cartridge
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/14—Electrothermal mechanisms
    • H01H71/16—Electrothermal mechanisms with bimetal element
    • H01H71/164—Heating elements

Definitions

  • the present invention relates principally to an overheat protection device for electric circuits.
  • This device is of the ltype having -a bimetallic strip connected as a circuit breaker to the electrical circuits of various installations, and particularly of electromagnetic units.
  • the present invention provides in combination reliable cut-off in case of a high overcurrent, such -as is generally afforded by a fuse wire, and reliable actuation of a bimetallic strip in case of a moderate, but prolonged overcurrent.
  • a high overcurrent such -as is generally afforded by a fuse wire
  • reliable actuation of a bimetallic strip in case of a moderate, but prolonged overcurrent.
  • said device includes at least one bimetallic strip, the position of which determines the opening or closing of the electric -circuit to be controlled, and a heating resistance wire mounted adjacent to said bimetal and connected in series or in parallel with the electric circuit under control.
  • said heating resistance wire is helically wound around said bimetallic strip.
  • any abrupt overcurrent Will result in a quick heating of the resistance wire, i.e. a heating at least as rapid as that of the electric units connected in the circuit under control.
  • This substantially instantaneous heating will cause a deformation of the bimetallic strip and thus the opening of the electric circuit to protect the units connected thereto.
  • a sleeve is provided to afford electrical insulation between the aforesaid strip and resistance wire.
  • the invention encompasses, as new products of manufacture, the electric units and systems using the present protector device, and especially electromagnetic units such as electric razors and clippers thus protected.
  • FIGURE l is a sectional view of a device according to the invention, taken along line I-I of FIGURE 2.
  • FIGURE 2 is a view from above of the device showny in FIGURE l.
  • FIGURES 3 and 4 are two sectional views, taken along lines III-III of FIGURE 4 and IV-IV of FIGURE 3 respectively, illustrating an application of a protector device similar to that shown in FIGURES 1 and 2, for example to a two voltage electric razor.
  • FIGURE 5 shows the voltage changer of the apparatus shown in FIGURES 3 and 4 in a different position from that shown in FIGURE 3.
  • a protector device in accordance with the invention comprises principally a bimetallic strip or bimetal 1 which is secured to an insulating support 2, e.g. of card- Iboard coated with Bakelite, by means of a rivet 3.
  • an insulating support 2 e.g. of card- Iboard coated with Bakelite
  • a contact '5 is provided on the insulating part 4.
  • a metal part 6 which carries a contact 7 opposite to contact 5 carried by the bimetal and which may for example be riveted -to support 2.
  • An insulating sleeve or bushing 8 is mounted on the bimetal and may be mad-e of a moulded insulating material having good resistance to temperature rises, such as polytetrauorethylene.
  • FIGURES l and 2 there is diagrammatically shown at 9 a standard current-.supply plug an-d at 10 and 1v1 the respective inlet and outlet wires for the current flowing through the protector device 12 such as hereinabove described, whereas a working unit is shown in blockform at 13.
  • the electric current flows successively through: the current-supply wire 10; resistance wire 14 which is secured, for example, by welding, at a point 15 of the bimetal '1, then wound around the insulating sleeve 8 and secured by its other end to contact c-ontacts 5 and 7, when the latter are pressed against each other by the sufficiently cold bimetal 1; conducting part 6; wire 10', which is fastened to part 6, for example by means of a contactrivet 17; unit 13; then outlet wire 11.
  • apertures or perforations may be provided in sleeve 8 to promote the iiow of heat from the resistance wire .14 to the bimetal.
  • the resistance wire 14 is in series with unit 13 which is to be protected by device 12, w-hile no current flows through bimetal 1 itself. If so desired, the resistance wire 14 may be shunted lacross the supply-wire of unit 13, provided that the contacts 5, 7 remain connected in series to the Isupply circuit of unit 13. The opera-tion of the operator of the protector device shown in FIGURES 1 and 2 remains then quite unchanged.
  • FIGURES 3 and 4 more precisely illustrate the application of a protector device similar to that shown inthe preceding iigures, to a vibrator, e.g. for an electric razor, including two inductor coils 18 and 1-9.
  • a vibrator e.g. for an electric razor
  • FIGURES 3 and 4 the same references as in FIGURES 1 and 2 are used to denote similar parts.
  • a bimetal 1 surrounded by its heating resistance wire 14, which is connected in ser-ies to the supply circuit
  • the bimetal 1 is mounted on its insulating support 2 and the mounting of contact 5 at the free end of the bimetal is the lsame as in FIGURES 1 and 2.
  • the insulating plate 2 is secured to the razor case 20, e.g. by means of four stu-ds 21 moulded integral with case 20; the plugs 10 and 11 supplying current to the razor are of the type usual in such units and are to be used with a ,special line-cord for the razor.
  • Said plugs 10 ⁇ and 1'1 are respectively connected to conducting part 6 carrying the lixed contact 7 and to plate 22, itself connected to one end of coil .19 through a contact-piece 23 and possibly, according to the position of the voltage switchbutton 26, to one end of coil 18, through a at contact rbar 24 and a conducting sector 25 of the voltage switchbutton 26 (when in its position shown in FIGURE B).
  • plug 10 is connected to wire l14 and therethrough to bimetal 1 at the welding spot 15.
  • Bimetal 1, and therefore wire 14 are connected by a wire 27 to the other end of coil 18 and sometimes, according as the position of switch-button 26 such as shown in FIGURE 3, to the other end of coil 19, through sector 28, contact-bar 29 and wire 30.
  • a control assembly for a shaver comprising a casing and an electric motor having two identical windings, said control assembly including an electric insulating plate secured to and spaced ⁇ from one wall of said casing, a first, a second, a third and a fourth electrically conductive strip-like members, secured to the face of said plate facing said casing wall, said members having respective free ends disposed at angularly spaced consecutive locations on a common imaginary circle parallel to said casing wall, said first and second members being respectively connectable to the terminals of a source of electric current, said lirst member being formed by a bimetal strip carrying at its end opposite to said free end a movable contact engageable with a fixed contact carried by a metal part secured to said insulating plate, said motor windings being respectively connected between said first and said third members and between said second and said fourth members, a voltage-switch button mounted in a hole formed in said casing wall coaxially with said imaginary circle and angularly movable between a
  • a control assembly for an electric shaver as set forth in clairn 1 wherein said movable contact is electrically insulated from said bimetal strip by an insulating part made of a synthetic resinous material force-fitted at the end of said bimetal strip opposite to said free end, said bimetal strip being surrounded by a yrigid and integral electric insulating sleeve made of a synthetic resinous material, slipped onto said bimetal strip and extending in the'longitudinal direction thereof, a heating resistance wire being helically wound around said sleeve for heating said bimetal strip, said sleeve being provided with heat-transfer apertures, said wire having its rst end electrically connected to said movable electric contact and its second end connected to said bimetal strip.
  • a control assembly for an electric shaver as set forth in claim 1 wherein a hole is provided in said shaver 5 6 casing, an insulating insert being fitted within said hole 12,408,568 9/ 1946 McClure ZOO-122 ⁇ and supporting two current-supply spins extending through 3,003,086 10/ 1961 Strobel et al 200-122 X said insulating insert and respectively connected to said 3,023,350 2/ 1962 Broadley et al. 20G-122 metal part carrying a fixed contact and to said fourth FOREIGN PATENTS strip-like member.

Landscapes

  • Thermally Actuated Switches (AREA)
  • Contacts (AREA)
  • Fuses (AREA)
US360312A 1964-02-06 1964-04-16 Electric shaver control assembly Expired - Lifetime US3272943A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR962922A FR1392671A (fr) 1964-02-06 1964-02-06 Dispositif de protection contre les échauffements de circuits électriques

Publications (1)

Publication Number Publication Date
US3272943A true US3272943A (en) 1966-09-13

Family

ID=8822618

Family Applications (1)

Application Number Title Priority Date Filing Date
US360312A Expired - Lifetime US3272943A (en) 1964-02-06 1964-04-16 Electric shaver control assembly

Country Status (5)

Country Link
US (1) US3272943A (enrdf_load_stackoverflow)
CH (1) CH409090A (enrdf_load_stackoverflow)
DE (1) DE1925554U (enrdf_load_stackoverflow)
FR (1) FR1392671A (enrdf_load_stackoverflow)
GB (1) GB1054721A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1361636A1 (de) * 2002-05-10 2003-11-12 Hugo Brennenstuhl GmbH & Co. KG Schutzschalter für eine Kabeltrommel
US20140166639A1 (en) * 2011-08-03 2014-06-19 Schneider Electric Industries Sas Bimetal thermal element and the manufacturing method thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2669769B1 (fr) * 1990-11-28 1994-03-11 Telemecanique Element thermique pour relais de surcharge.

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1908676A (en) * 1929-07-06 1933-05-16 Birka Regulator Ab Electrical regulating device
US2302924A (en) * 1940-07-17 1942-11-24 Valverde Robert Method and apparatus for automatic control
US2408568A (en) * 1942-07-04 1946-10-01 Isidore Davidoff Low voltage flasher
GB679475A (en) * 1949-04-07 1952-09-17 Triplite Ltd Heat-responsive snap-action electric switch apparatus
GB721435A (en) * 1951-02-20 1955-01-05 Edward Wilcox And Company Ltd Improvements in or relating to electrical relays
US3003086A (en) * 1958-06-19 1961-10-03 Robertshaw Fulton Controls Co Thermal relay
US3023350A (en) * 1959-03-31 1962-02-27 Texas Instruments Inc Electrical switch means

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1908676A (en) * 1929-07-06 1933-05-16 Birka Regulator Ab Electrical regulating device
US2302924A (en) * 1940-07-17 1942-11-24 Valverde Robert Method and apparatus for automatic control
US2408568A (en) * 1942-07-04 1946-10-01 Isidore Davidoff Low voltage flasher
GB679475A (en) * 1949-04-07 1952-09-17 Triplite Ltd Heat-responsive snap-action electric switch apparatus
GB721435A (en) * 1951-02-20 1955-01-05 Edward Wilcox And Company Ltd Improvements in or relating to electrical relays
US3003086A (en) * 1958-06-19 1961-10-03 Robertshaw Fulton Controls Co Thermal relay
US3023350A (en) * 1959-03-31 1962-02-27 Texas Instruments Inc Electrical switch means

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1361636A1 (de) * 2002-05-10 2003-11-12 Hugo Brennenstuhl GmbH & Co. KG Schutzschalter für eine Kabeltrommel
US20140166639A1 (en) * 2011-08-03 2014-06-19 Schneider Electric Industries Sas Bimetal thermal element and the manufacturing method thereof
US10368398B2 (en) * 2011-08-03 2019-07-30 Schneider Electric Industries Sas Bimetal thermal element and the manufacturing method thereof

Also Published As

Publication number Publication date
GB1054721A (enrdf_load_stackoverflow)
DE1925554U (de) 1965-10-21
FR1392671A (fr) 1965-03-19
CH409090A (fr) 1966-03-15

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