US3770950A - Electric light system for a motor-driven appliance - Google Patents

Electric light system for a motor-driven appliance Download PDF

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Publication number
US3770950A
US3770950A US00276517A US3770950DA US3770950A US 3770950 A US3770950 A US 3770950A US 00276517 A US00276517 A US 00276517A US 3770950D A US3770950D A US 3770950DA US 3770950 A US3770950 A US 3770950A
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US
United States
Prior art keywords
motor
current
lamp
illuminating
work area
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
US00276517A
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English (en)
Inventor
J Brenneman
R Enders
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Philips North America LLC
Schick Inc
Original Assignee
Schick Inc
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Publication date
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Publication of US3770950A publication Critical patent/US3770950A/en
Assigned to NORTH AMERICAN PHILIPS CORPORATION, A CORP. OF DE. reassignment NORTH AMERICAN PHILIPS CORPORATION, A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SCHICK INCORPORATED, A CORP. OF DE.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B19/00—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers
    • B26B19/38—Details of, or accessories for, hair clippers, or dry shavers, e.g. housings, casings, grips, guards
    • B26B19/46—Details of, or accessories for, hair clippers, or dry shavers, e.g. housings, casings, grips, guards providing for illuminating the area to be shaved or clipped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B19/00—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers
    • B26B19/28—Drive layout for hair clippers or dry shavers, e.g. providing for electromotive drive
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S30/00—Cutlery
    • Y10S30/01—Rechargeable battery operated

Definitions

  • ABSTRACT A compact light-weight electric shaver includes a DC motor, a bridge rectifier for converting the AC line current to DC line current, and a low-voltage electric lamp for illuminating the work area adjacent the shaver.
  • the lamp is connected in series between the bridge rectifier and the motor to obviate the need for a low-voltage power supply, and a zener diode is connected across the lamp to provide a constant illumination level and to prevent the current through the lamp from exceeding the rating of the lamp when the motor is starting or operating under heavy load.
  • the present invention relates to electric light circuits, and more particularly to an electric light circuit for a motor-driven electric appliance.
  • Small hand-held motor-driven line-operated appliances such as electric shavers and electric drills, are often used in areas having poor illumination, making it difficult or impossible to operate the appliances without additional illumination. Accordingly, it is highly desirable that such appliances include an integral source of illumination for their adjacent work area.
  • mylar and other AC-type capacitors suitable for this purpose occupy a relatively large volmium. This is especially true in such small hand-held appliances as ladies electric shavers, where the need for illumination is more pronounced because the appliance is normally not used in front of an illuminated mirror, and where weight and size factors contribute heavily to customer acceptance.
  • mylar capacitors time within an appliance, where space is often at a premotor and serially including the electric lamp are also included for supplying the required current to the motor, the supplied current exceeding the predetermined maximum allowable current rating of the lamp.
  • Means coupled to the electric lamp are also provided for limiting the current therethrough to a level less than the predetermined maximum allowable level.
  • FIG. 1 is a perspective view of a ladies electric shaver incorporating an electric light circuit constructed in accordance with the invention
  • FIG. 2 is a top view, partially fragmentary, of the electric: shaver taken along lines 2-2 of FIG. 1.
  • FIG. 3 is a cross-sectional side view of the electric shaver of FIG. 1 taken along lines 3-3 of FIG. 2;
  • FIG. 4 is a schematic circuit diagram of the electric shaver of FIG. 1.
  • the shaver is seen to have a housing formed by two complimentary half sections 11 and 12 formed of a high impact plastic or similar nonconductive material.
  • the lower end of the housing forms a handle for the shaver and the upper end is widened to accommodate a shaving head.
  • the lower portion of the shaving head comprises a three tier stationary comb blade 13 screw: Removal of the cartridge isfacilitated by an ejection control 15, which is slidablymounted in opposed recesses in the handle portions of the housing sections and is disposed to push up onthe cartridge when actuated.
  • a single-pole single-throw switch 17 is carried near the bottom end of the housing to enable It is a more specific object of the present invention to provide a more economical and compact illumination circuit for a motor-driven appliance.
  • the invention is directed to a system for illuminating the work area of a motor-driven appliance.
  • the system comprises a motor having a running current requirement and a greater peak starting current requirement, a source of current capable of supplying the operating requirements of the motor, and an electric lamp having a predetermined maximum allowable current rating for illuminating the work area.
  • Circuit means coupled between the current source and the the shaver to be turned on. and off at will.
  • the upper portion of the shaving head comprises a transparent plastic lens l6for illuminating the work area adjacent the shaver head.
  • This lens is preferably formed to extend around the top edge of the shaver head and may have one or more of its surfaces scored or otherwise treated to better diffuse light passing through from an underlying source of illumination.
  • the lens is seen to overlie an electric lamp 18, and to have its undersurface scored adjacent the lamp with a large number of parallel lines 19 to diffuse the light from the lamp. It will be appreciated that for certain purposes it may be desirable to focus this light on a particular point, and that for other purposes it may be desirable to widely diffuse the light, and that in either case this can be accomplished by appropriate modification of lens 14.
  • the shaver in cross section is seen to include an electric motor 20, which, for the previously mentioned reasons of size, weight, and economy, may be a conventional permanent magnet type designed to operate from DC current. It will be appreciated that, while a permanent magnet DC motor is shown, other types of motors and other types of electromechanical transducers, such as solenoid-driven vibrators, could be used in appropriate instances in conjunction with the invention.
  • An eccentric drive member 21 is mounted on the output shaft 22 of the motor. This member includes an off-center pin 23 which engages a slot-shaped recess in one end of a connecting arm 24. As the motor turns, drive member 21 rotates and imparts a reciprocating motion to connecting arm 24.
  • arm 24 is operatively engaged with a cutting blade 25, which is slidably mounted on carriage clock 14 immediately beneath stationary comb 13. As blade 25 is caused to reciprocate under comb 13 by connecting arm 24, it coacts with comb 13 to achieve the desired shaver cutting action.
  • Power for shaver is obtained by means of a line cord (not shown) which plugs into a standard twoprong male socket 26 on the bottom of the shaver handle.
  • Lamp 18, which may have either pigtail-type connecting leads or a standard bayonet or screw-type base, is held in position by means of an appropriate socket 27.
  • one terminal of socket 26 is connected by a currentlimiting resistor 28 to one input terminal of a bridge rectifier 29.
  • the remaining terminal of socket 26 is connected through switch 17 to the remaining input terminal of the bridge rectifier.
  • Bridge rectifier 29 comprises four diodes 30-33 connected in a standard bridge configuration. Specifically, the cathode of diode 30 and the anode of diode 31 are connected to resistor 28 and the cathode of diode 32 and the anode of diode 33 are connected to switch 17.
  • the anode of diodes 30 and 32 are connected together to form a negative output terminal 34 for the bridge rectifier, and the cathodes of diodes 31 and 33 are connected together to form a positive output terminal 35.
  • Negative output terminal 34 is connected directly to the negative input terminal of the motor, and positive output terminal 35 is connected to the remaining motor input terminal through lamp 18.
  • a current limiting means in the form of a zener diode 36 is connected across lamp 18 to prolong lamp life and provide a more uniform illumination level during variations in 'motor loading.
  • the anode of zener diode 36 is connected to terminal 35 and the cathode is connected to motor so that the diode, in effect, forms a shunt path for current around lamp 18.
  • a zener diode is shown in the present embodiment it will be appreciated that other types of elements having an avalanche characteristic, i.e. having a predetermined conduction threshold voltage at which they begin to conduct, or their circuit equivalents, could be used as well.
  • resistor 28 serves as a current limiting device at this point to inhibit arcing between commutator segments as current is first applied to the motor.
  • motor 20 may draw a starting current of three to five times its full load current. Absent zener diode 36, this starting current would flow through lamp I 18, resulting in an overrated condition and an annoying high intensity flash each time the motor is started. The repeated overrated condition would eventually result in premature lamp failure. Zener diode 36 eliminates this condition by limiting the voltage across the lamp to the conduction threshold voltage of the diode.
  • the circuit parameters are selected so that lamp 18 produces its full rated light output. This is accomplished by selecting lamp- 18 to have a rated current approximately equal to or less than that of motor 20, and by selecting the conduction threshold of zener diode 36 to be approximately equal to the rated voltage of the lamp. Now, should the motor current increase, as during starting, zener diode 36 conducts more heavily and shunts current away from lamp 18. This maintains the voltage drop across lamp 18 at the threshold voltage level of the diode, which corresponds to the rating of lamp 18. Thus, the lamp is protected from having an applied voltage, and, hence, an applied current, in excess of its ratings. Furthermore, the lamp is caused to operate without the annoying flash which would otherwise accompany each start.
  • a DC motor which has a running current of '60 milliamperes.
  • the lamp selected has a rating of 28 volts at 40 milliamperes, the zener diode has a conduction threshold of 28 volts, and
  • the motor is designed to operate at 92 volts. Although the motor current may increase to l20-220 milliamperes while starting, the current through the lamp is effectively limited to 40 milliamperes by reason of voltage across the lamp being limited to 28 volts.
  • a zener diode having a higher or lower conduction threshold than the voltage rating of the lamp it may be desirable to select a zener diode having a higher or lower conduction threshold than the voltage rating of the lamp. For example, if the motor in the above example had had a running current at or slightly below the rating of the lamp, say 40 milli-- amperes instead of milliamperes, or if the zener diode had had a wide conduction threshold tolerance, it might have been desirable to select a zener diode having a threshold voltage above the rated voltage of the lamp, say 30 volts instead of 28 volts, to insure full illumination of the lamp. Another example is where the zener diode is selected to have a threshold voltage below the rated voltage of the lamp to prolong the life of the lamp. The disadvantage with this is that full illumination is not obtained from the lamp and the resulting light may have an undesirable yellow cast.
  • the illustrated electric shaver will operate from direct current as well as alternating current, the bridge rectifier network functioning during DC operation to establish the DC current at the proper polarity on terminals34 and 35.
  • the invention in connection with AC lines of different voltages and frequencies, or in connection with a dual voltage, e.g. l20-220 volt shaver by selecting appropriate components for the circuit.
  • the invention could be practiced in connection with an AC motor by connectances.
  • the circuit provides constant light output, regardless of the load imposed on the motor, and extends lamp life by protecting the lamp from operation beyond its ratings.
  • the circuit is compact and inexpensive, making it particularly attractive for incorporation in small electric shavers where size, weight, and cost are major factors in product acceptance. Furthermore, it can be readily adapted to a wide variety of appliances because of its lack of resistors and other power dissipating components.
  • a system for illuminating the work area of a motor-driven appliance comprising:
  • a system for illuminating the work area of a motor-driven appliance operable from an AC line comprising:
  • a DC motor having a running current requirement and a greater peak starting current requirement;
  • means comprising a rectifier circuit for converting said AC line current to a unidirectional current capable of supplying said operating requirements of said motor;
  • an incandescent electric lamp having a predetermined current rating for illuminating said work area; means for establishing an electrical circuit between said rectifier circuit and said motor which serially includes said incandescent lamp for supplying said required current to said motor, said supplied cur rent on occasions exceeding said current rating of said incandescent lamp; and means comprising a zener diode connected across said incandescent lamp for limiting the current therethrough to a level not exceeding said rated level.
  • V 9 A system for illuminating the work area of a motor-driven appliance as defined in claim 8 wherein said current rating of said incandescent lamp corresponds substantially to said running current requirement of

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Dry Shavers And Clippers (AREA)
US00276517A 1972-07-31 1972-07-31 Electric light system for a motor-driven appliance Expired - Lifetime US3770950A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US27651772A 1972-07-31 1972-07-31

Publications (1)

Publication Number Publication Date
US3770950A true US3770950A (en) 1973-11-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00276517A Expired - Lifetime US3770950A (en) 1972-07-31 1972-07-31 Electric light system for a motor-driven appliance

Country Status (7)

Country Link
US (1) US3770950A (uk)
JP (1) JPS4945583A (uk)
CA (1) CA988613A (uk)
DE (1) DE2316901A1 (uk)
FR (1) FR2194916B1 (uk)
GB (1) GB1413421A (uk)
IT (1) IT977946B (uk)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6227676B1 (en) 1999-12-21 2001-05-08 Lynn Sneddon Method and apparatus for shaving
WO2002034482A1 (de) * 2000-10-20 2002-05-02 Braun Gmbh Elektrisch betriebenes haarentfernungsgerät
WO2002034481A1 (de) * 2000-10-20 2002-05-02 Braun Gmbh Elektrisch betriebenes haarentfernungsgerät
US20040194316A1 (en) * 2003-04-04 2004-10-07 Ray-Ming Lin Shaver having germ-killing device
FR3016500A1 (fr) * 2014-01-23 2015-07-24 Seb Sa Appareil de traitement corporel avec optique integree
US20180043559A1 (en) * 2016-08-11 2018-02-15 The Gillette Company Handle for a razor
US20180043556A1 (en) * 2016-08-11 2018-02-15 The Gillette Company Handle for a razor
US10414058B2 (en) 2016-08-11 2019-09-17 The Gillette Company Llc Handle for a razor
US10940598B2 (en) 2016-08-11 2021-03-09 The Gillette Company Llc Handle for a razor
US11130247B2 (en) 2016-08-11 2021-09-28 The Gillette Company Llc Handle for a razor
US11285630B2 (en) 2016-08-11 2022-03-29 The Gillette Company Llc Handle for a razor

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5598773U (uk) * 1978-12-28 1980-07-09
JPS6028170U (ja) * 1983-08-01 1985-02-26 東京フエンス工業株式会社 蝶番金具用枢軸

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2595287A (en) * 1946-10-07 1952-05-06 Lester L Perry Electric shaver light
US2965748A (en) * 1959-03-06 1960-12-20 Lionel Corp Illuminated electric razor
US3473106A (en) * 1966-04-14 1969-10-14 Burroughs Corp Overload protection for a voltage-regulated power supply
US3604915A (en) * 1969-01-15 1971-09-14 Wahl Clipper Corp Electric motor appliance with associated light source

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2595287A (en) * 1946-10-07 1952-05-06 Lester L Perry Electric shaver light
US2965748A (en) * 1959-03-06 1960-12-20 Lionel Corp Illuminated electric razor
US3473106A (en) * 1966-04-14 1969-10-14 Burroughs Corp Overload protection for a voltage-regulated power supply
US3604915A (en) * 1969-01-15 1971-09-14 Wahl Clipper Corp Electric motor appliance with associated light source

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Silicon Zener Diode and Rectifier Handbook, Second Edition, 1961, pg. 75, 80, 81, 87, Motorola Semiconductor Products Division. *

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6227676B1 (en) 1999-12-21 2001-05-08 Lynn Sneddon Method and apparatus for shaving
WO2002034482A1 (de) * 2000-10-20 2002-05-02 Braun Gmbh Elektrisch betriebenes haarentfernungsgerät
WO2002034481A1 (de) * 2000-10-20 2002-05-02 Braun Gmbh Elektrisch betriebenes haarentfernungsgerät
US20030167638A1 (en) * 2000-10-20 2003-09-11 Raoul Bader Electrically driven hair removal device
US20040024430A1 (en) * 2000-10-20 2004-02-05 Raoul Bader Electrically operated hair removal device
US6871402B2 (en) 2000-10-20 2005-03-29 Braun Gmbh Electrically driven hair removal device
US20040194316A1 (en) * 2003-04-04 2004-10-07 Ray-Ming Lin Shaver having germ-killing device
EP2898790A1 (fr) * 2014-01-23 2015-07-29 Seb S.A. Appareil de traitement corporel avec optique integrée
FR3016500A1 (fr) * 2014-01-23 2015-07-24 Seb Sa Appareil de traitement corporel avec optique integree
US20180043559A1 (en) * 2016-08-11 2018-02-15 The Gillette Company Handle for a razor
US20180043556A1 (en) * 2016-08-11 2018-02-15 The Gillette Company Handle for a razor
US10226874B2 (en) * 2016-08-11 2019-03-12 The Gillette Company Llc Handle for a razor
US10414058B2 (en) 2016-08-11 2019-09-17 The Gillette Company Llc Handle for a razor
US10940598B2 (en) 2016-08-11 2021-03-09 The Gillette Company Llc Handle for a razor
US11130247B2 (en) 2016-08-11 2021-09-28 The Gillette Company Llc Handle for a razor
US11285630B2 (en) 2016-08-11 2022-03-29 The Gillette Company Llc Handle for a razor

Also Published As

Publication number Publication date
FR2194916B1 (uk) 1976-05-21
GB1413421A (en) 1975-11-12
CA988613A (en) 1976-05-04
IT977946B (it) 1974-09-20
FR2194916A1 (uk) 1974-03-01
DE2316901A1 (de) 1974-02-14
JPS4945583A (uk) 1974-05-01

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Legal Events

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AS Assignment

Owner name: NORTH AMERICAN PHILIPS CORPORATION, HIGH RIDGE PAR

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SCHICK INCORPORATED, A CORP. OF DE.;REEL/FRAME:004447/0327

Effective date: 19811230