US3213301A - Electric dry shaver - Google Patents

Electric dry shaver Download PDF

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US3213301A
US3213301A US246488A US24648862A US3213301A US 3213301 A US3213301 A US 3213301A US 246488 A US246488 A US 246488A US 24648862 A US24648862 A US 24648862A US 3213301 A US3213301 A US 3213301A
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Prior art keywords
armature
shaft
support
oscillating
motor
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US246488A
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Jepson Ivar
Sigmund R Kukulski
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Sunbeam Corp
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Sunbeam Corp
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Priority to US246488A priority Critical patent/US3213301A/en
Priority claimed from FR953268A external-priority patent/FR1378352A/en
Priority claimed from US44597365 external-priority patent/US3290776A/en
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Publication of US3213301A publication Critical patent/US3213301A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B26HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26BHAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B19/00Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers
    • B26B19/28Drive layout for hair clippers or dry shavers, e.g. providing for electromotive drive
    • B26B19/282Motors without a rotating central drive shaft, e.g. linear motors
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B26HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26BHAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B19/00Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers
    • B26B19/12Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers of the oscillating- cutter type; Cutting heads therefor; Cutters therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B26HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26BHAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B19/00Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers
    • B26B19/28Drive layout for hair clippers or dry shavers, e.g. providing for electromotive drive
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K33/00Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/02Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs
    • H02K33/04Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs wherein the frequency of operation is determined by the frequency of uninterrupted AC energisation

Description

Oct. 19, 1965' JEPSON ETAL 3,213,301
ELECTRIC DRY SHAVER C5 Sheets-Sheet 3 Filed Dec. 21, 1962 5a 25 INVENTORS M42 Japsord AA/D BY SIGMUND R. KuzL/Lsz/ fieofge K 614% Arron/v5),
United States Patent 3,213,301 ELECTRIC DRY SHAVER Ivar .Iepson, Oak Park, and Sigmund R. Kukulski, Chicago, Ill., assignors to Sunbeam Corporation, Chicago, 111., a corporation of Illinois Filed Dec. 21, 1962, Ser. No. 246,488 14 Claims. (Cl. 310-38) The present invention relates to apparatus for removing beards or face hair as well as for removing halr from arms, legs and other portions of the human body. Such apparatus is generally referred to as an electric dry shaver.
For many years electric dry shavers, very similar to that disclosed in Jepson Patent No. 2,797,479, granted July 2, 1957, and assigned to the same assignee as the instant application, had been extensively sold on the market. The electric dry shaver of the above-mentioned Jepson patent is one in which the hair to be removed, such as the beard, enters the cutting area through a network of small holes in a curved perforated comb. An oscillating cutter comprising a parallel blade travels back and forth across the comb at high speed and is thrown by centrifugal force against the inside surface of the comb, thus providing a very satisfactory cutting action with the comb. The cutter blade floats in a cutter head and shaft assembly that is oscillated by a powerful electric motor, with the cutter blade oscillating at a frequency in excess of seven thousand cycles per minute. An electric motor of the rotary type is mounted within the casing, and the cutter mechanism includes an oscillating shaft. A suitable means for converting rotary motion of the motor shaft to oscillating motion of the cutter shaft is provided and drivingly interconnects the motor and the cutter mechanism. Separate bearings for the motor shaft and for the oscillating cutter shaft are provided. It would be desirable to provide an arrangement in which one set of these bearings could be eliminated, and, in fact, an arrangement in which the oscillating cutter shaft also becomes the shaft about which the armature of the motor moves. With such an arrangement the manufacturing cost is greatly reduced and the assembly operation is substantially simplified.
It will be appreciated that in a shaver in which the cutting blade or blades are oscillated, the blades must come to a complete stop at each end of the stroke and then movement in the opposite direction must take place. This means that at each end of the stroke it is necessary for the prime mover to supply the necessary energy to overcome this inertia of the moving parts which are mo mentarily at a standstill. It would be desirable to provide an arrangement wherein it is unnecessary for the prime mover to supply this energy twice during each cycle to overcome the inertia of the blade assembly at the ends of the oscillating stroke to move this assembly in the opposite direction. Accordingly it is desirable to provide an energy storage arrangement whereby energy stored during a portion of the operating stroke is released to overcome the inertia due to momentary stoppage of the moving cutter parts. It would also be desirable to provide some sort of resilient stopping means whereby the blade assembly is cushioned to a stop at each end of its stroke.
In an oscillating shaver such as is disclosed in the abovementioned Jepson patent there is effectively provided a motor chamber and a cutter chamber which are separated by a wall-like member. Since the driving connections between the motor and cutter mechanism are disposed outide the cutter chamber, no problem exits with respect to having hair received in the cutter chamber passing into the motor chamber. Since it is desirable, as set forth above, to have the armature shaft and oscillating 3,213,301 Patented Oct. 19, 1965 ICE cutter shaft coincident or, in other words, having a com mon armature and cutter shaft, it is quite obvious that there must be a connection between the motor and cutter chambers. It would, therefore, be desirable to provide an improved means for preventing hair from entering the motor chamber. It would furthermore be desirable to eliminate the maximum number of parts while still retaining the same cutting functions whereby a very inexpensive and yet very efficient construction is obtained.
Accordingly, it is an object of the present invention to provide a new and improved electric dry shaver.
It is another object of the present invention to provide a dry shaver of the type employing an oscillating cutting mechanism driven by an electric motor in which only a single shaft for both the motor and the cutting mechanism is employed.
It is another object of the present invention to provide an electric shaver of the type employing an oscillating ,cutter wherein cutter blades are supported on extensions of the armature laminations.
Still another object of the present invention resides in the provision of an electric dry shaver having an oscillating motor wherein the oscillating armature directlysupports one or more cutting blades.
It is a further object of the present invention to provide an electric dry shaver of the oscillating type wherein the requirement to overcome the inertia of the cutter blade assembly at each end of its stroke when the direction of motion is changed is eliminated and, instead, stored energy is utilized to act as a cushioned stop and, moreover,
proceeds and the features of novelty which characterize the invention will be pointed out with particularity in the claims annexed to and forming a part of this specification.
For a better understanding of the present invention reference may be had to the accompanying drawings in which:
FIG. 1 is a side elevational view of an electric dry shaver embodying the present invention with a portion thereof cut away more clearly to illustrate the invention;
FIG. 2 is an enlarged longitudinal sectional view of the shaver shown in FIG. 1;
FIG. 3 is a sectional view taken on line 33 of FIG. 2, assuming that FIG. 2 shows the complete structure;
FIG. 4 is a sectional view taken on line 4-4 of FIG. 2, agaln assuming that FIG. 2 shows the complete structure;
FIG. 5 is a fragmentary sectional view taken on line 55 of FIG. 2, also assuming that FIG. 2 shows the complete structure;
FIG. 6 is an enlarged top plan view of the shaver of FIG. 1 with the comb, comb locks and cutting blades removed, and with certain portions of the shaver cut away more clearly to illustrate the present invention; and
FIG. 7 is an exploded perspective view of parts of the electric dry shaver of the present invention omitting the casing and those parts omitted in FIG. 6.
The present invention is concerned with an arrangement in which an oscillating shaft is supported for oscillation on a suitable support member. Moreover, this oscillating shaft supports a motor armature comprising a number of laminations, a few of which project upwardly to support cutter blades. A field structure is adapted to be mounted on the support member so that the entire motor and cutting mechanism is a simple compact mechanism mounted on a support in a subassembly which can readily be associated as a unit with a shaver housing. Moreover, energy storage means are provided which are associated with the oscillating shaft so that energy is stored and released by this energy storage means as the motor is operated whereby a motor of relatively low power output is sufficient and greatly increased efficiency of operation results. In a specific embodiment this energy storage means comprises springs which tend to move the oscillating shaft to a central or homing position.
Referring now to the drawings, the electric dry shaver embodying the present invention is generally designated by the reference numeral 10. The external appearance of the shaver, the construction of the perforated comb and cutting blades, and the means for biasing the cutting blades into engagement wtih the comb form no part of the present invention and may be similar to or identical with that disclosed in a copending Jepson and Schuessler application, Serial No. 109,551, filed May 12, 1961, and assigned to the same assignee as the present application. The present invention is essentially concerned with the motor and cutter supporting and oscillating mechanism. Essentially, the shaver comprises the cutting mechanism generally designated at 11, including a plurality of cutting blades 12, six of them being shown in the drawings, although, obviously, a greater or lesser number of blades may be employed. The blades 12 coact with a comb or stationary cutting member 13, which latter may be identical with those disclosed in the above mentioned Jepson patent or Jepson & Schuessler copending application. The comb and cutting mechanism are associated with a suitable casing comprising three parts 14, and 16 (designated hereinafter as casing members or sections), the comb 13 preferably comprising a substantial portion of the surface of the casing. The portion 14 of the casing is preferably a cup-shaped member open at the top and provided with a circumferential ledge or shoulder 17 around the inside surface near the open end thereof, this ledge or shoulder being a predetermined distance down from the open end. The casing members 15 and 16 are commonly referred to as end caps. The casing for the electric shaver comprising portions or elements 14, 15 and 16 is preferably of boxlike configuration so that it may readily be held in the hand of the user. It is preferably molded from a suitable plastic material.
In accordance with the arrangement disclosed in Jepson et a1. application Serial No. 322,795, filed November 12, 1963, the shaver 10 includes a support or chassis member 19 (also designated as a frame or frame member) to which the motor described hereinafter and the cutting mechanism or assembly 11 are mounted in the manner described hereinafter. The support or chassis member 19 may be a molded insulating support or, as in a device built in accordance with the present invention, may comprise a die casting of light metal such as zinc. This support or chassis member 19 includes a peripheral portion 19a having such a configuration as to be snugly received in the open end of cup shaped housing member 14 so as to rest on the ledge or shoulder 17, as clearly shown in FIGS. 2, 3, 4 and 5 of the drawings. When the support or chassis member 19 is disposed in the casing portion 14 as described above, it divides the shaver housing into two 'chambersan upper cutting chamber 20 and a lower chamber which houses at least a portion of the motor to be described hereinafter, and hence may be referred to as a motor chamber 21. As illustrated, the support or chassis member 19 is provided with a pair of spaced, parallel, longitudinal extending, raised side members 19b and 190 projecting upwardly from the portion 19a thereof, and
templates that the oscillating cutter shaft and motor shaft heretofore required are combined into a single shaft element. In other words, the cutter mechanism 11 and the prime mover or electric motor for oscillating the cutter mechanism are combined to eliminate certain elements. Before completing the description of the details of the frame or chassis member 19, consideration will be given to the electric motor incorporated in the shaver 10 which motor is generally designated by the reference numeral 25. The motor 25 is a simple compact motor with no brushes or contacts which could cause radio or television interference. As illustrated, it is a powerful resonant motor comprising a field structure 26 and an armature structure 27. The field structure, as best shown in FIGS. 2, 3, 4 and 7 of the drawings, comprises a plurality of U-shaped laminations 28 which are held together in an assembled stack by suitable rivets 29. A suitable field winding 30 encloses the bight portions of the assembled U-shaped laminations 28. The ends of the arms of the U-shaped laminations have a somewhat arcuate configuration to define spaced pole faces 31 and 32 extending along the entire length of the assembled field structure 26, as best shown in FIG. 7 of the drawings. The pole faces 31 and 32 are preferably concentric with a combined armature and cutter shaft 33 supporting a plurality of armature laminations 34 held in assembled relationship by suitable rivets 35, The armature 27 comprising the assembled armature laminations 34 is disposed within the air gap defined between the pole faces 31 and 32. The portion of the armature structure 27 adjacent the pole faces 31 and 32 and effectively within the field air gap functions as the motor armature and provides a low reluctance flux path between the pole faces 31 and 32. Consequently, the lower portion of the armature 27 is provided with cooperating pole faces 38 and 39 which are substantially coextensive with the pole faces 31 and 32, respectively. The combined armature and cutter shaft 33 supports the armature 27 for oscillating movement between the pole faces 31 and 32, energization of the winding 30 tending to move the armature pole faces into alignment with the field pole faces.
In accordance with the present invention, the armature 27 is adapted to be disposed in the opening 23 in the support or chassis member 19, and the upper surfaces of the projections 19d and 1% are provided with semicylindrical cavities 40 and 41, respectively, to function as lower bearing portions for the oscillating shaft 33. For lubrication purposes, the projections 19d and 192 are preferably provided with recesses 42 and 43, respectively (FIG. 2), for receiving suitable wicking 44, preferably saturated with a suitable lubricant. Any suitable means may be employed for securing the assembled laminations 27 to the oscillating shaft 33. This may comprise a press fit, a keyed arrangement or the like.
For the purpose of providing a normal or rest position of the armature 27, and also to provide energy storage means for storing energy from the electric motor and then releasing this energy during the oscillating stroke of the cutting means, one end of the shaft 33 is bifurcated so as to receive therein a rocker bar 48 having a pair of spaced recesses 45 on each side thereof. These recesses are each adapted to receive one end of an energy storage means in the form of a coiled compression spring 46, as best shown in FIGS. 5 and 7 of the drawings. Preferably these energy storage means are accurately calibrated to have a natural frequency of vibration of the order of the frequency of the alternating current supplied to winding 30. The other ends of these springs 46 are supported in opposed recesses 47 defined in adjacent faces of projections 191 and 19g extending upwardly and integrally formed with the frame or chassis member 19. The recesses 47 are open on the side thereof remote from the opening 23 so that the armature shaft 33 with the armature assembled thereon as well as the rocker bar 48 assembled therewith may be placed into position with the springs having adjacent ends thereof disposed in the recesses 45. The other ends of these springs may then readily be inserted in recesses 47 through the open sides of these recesses.
The normal or at rest position of the armature 27 is best shown in FIG. 3 of the drawings wherein the pole faces 38 and 39 thereof are completely out of registry with the pole faces 31 and 32 of the field structure. Upon energization of the winding 30 it will be apparent that the armature 27 will be attracted until the pole faces of the armature are in substantial registry with the pole faces of the field structure. It will be apparent that the motor 25 will operate at double the frequency of the alternating current supply, so that with a sixty cycle current supply to winding 30 the armature 27 and associated cutting mechanism will oscillate at 7200 cycles per minute.
In order to maintain the armature and associated shaft 33 within the lower bearing portions 40 and 41 and to hold the same in assembled relationship with the frame or chassis member 1 9, there are provided end bearing portions 50 and 51 which are suitably clamped to the chassis member 19 as by fastening means 53 which extend through aligned openings in the end bearing portions 50 and 51 and in the chassis 19, the latter openings being designated by the reference numeral 54.
For property maintaining the combined motor and armature shaft 33 in a predetermined longitudinal position with respect to the bearing portions 40 and 41, the shaft 33 is preferably provided with a washer receiving recess for receiving a suitable washer 56 (FIGS. 2 and 6) which engages one end of the bearing defined by end bearing portion 50 and the upwardly projecting abutment 19d, as clearly shown in FIG. 2 of the drawings. Preferably, the end of the shaft 33 adjacent end bearing portion 50 is threaded to receive a suitable nut 57, thus determining the longitudinal position of the shaft 33.
To support the field structure 26 from the frame or chassis member 19, suitable L-shaped brackets 58 are secured to the ends of the field laminations 28 by the rivets 29, and the same fastening means 53 which hold the end bearing portions 50 and 51 in assembled relationship also hold the field structure in the assembled relationship shown in FIGS. 3 and 4 of the drawings. Preferably the field laminations 28 are provided with projections 28:: (FIGS. 3 and 7) whereby these projections abut against the lower edge of chassis member 19, thus positioning the field structure relative to this frame or chassis member.
For the purpose of supporting the cutter blades 12, particular laminations of the armature structure 27 are designed somewhat differently from the remaining laminations so as to provide blade supporting portions. These laminations are specifically designated as 34a, 34b, 34c and 34d, and each comprises an upwardly directed segmental projection having a plurality of spaced notches 60, open at the top, disposed therein. These notches are disposed on radii of the axis of the shaft 33, and the same number of notches 60 and the identical spacing thereof are provided in each of the upwardly projecting portions of the laminations 34a, 34b, 34c and 34d. The number of these notches depends upon the number of cutting blades 12 employed, since these notches are designed to receive the cutting blades therein. In the above-mentioned Jepson patent only a single notch for supporting a'single blade was employed in each support, while in the copending Jepson and Schuessler application mentioned above three notches in each support were provided for supporting three blades. In the illustrated embodiment of the present invention six notches for supporting six blades in spaced relationship are illustrated. The projecting supports of the laminations 34b and 34c in addition to the notches 60 are provided with an equal number of slots or openings 61 to cooperate with locking means 12a and 12b provided on each cutting blade 12 in a manner fully described in the above-mentioned copending Jepson and Schuessler applicaion. Additionally, the slots 61 receive and retain therein the central or bight portions of somewhat U-shaped wirelike spring members 62 which have lateral projections from the ends of the legs of the U extending into the slots 60 of end laminations 34a and 34d. These springs 62 bias the cutting blades 12 toward the comb 13 and may be identical with those disclosed in the above-mentioned copending Jepson and Schuessler application. The particular construction of the springs 62, the blades 12 and the comb 13 forms no part of the present invention, and hence no further discussion thereof is included herewith except to mention that in order to support the comb 13 in the conventional manner the end bearing portions 50 and 51 are each provided with comb supporting projections 50a and 51a, respectively, which function in the identical manner of similar elements in the above-mentioned Jepson patent or copending Jepson and Schuessler application.
From the above description it will be apparent that during the cutting action of the cutting mechanism 11 hair will enter the cutting chamber 20, and this hair could enter the motor chamber 21 through the opening 23 unless additional means are provided to prevent this. To this end there are provided a pair of somewhat U-shaped hair seal brackets 63 (FIGS. 3, 4 and 6) which are held in position by the fastening means 53. These hair seal brackets are elongated U-shaped members for clampingly engaging one long edge of an elongated hair seal such as 64, one being provided on either side of armature 27 and clamped by a corresponding one of said brackets 63. Moreover, the armature 27, and specifically the laminations thereof, are provided on each side with a T-shaped slot 65 for receiving therein the T-shaped end 64a of the associated hair seal 64, as best shown in FIGS. 3 and 7 of the drawings. The hair seals 64 are preferably formed of a neoprene foam rubber.
As in the above-mentioned Jepson patent or the copending Jepson and Schuessler application, the comb 13 is securely held in position on the supporting portions 50a and 51a of end bearing portions 50 and 51, respectively, by comb locks 67 in a manner Well understood by those skilled in the art. The comb locks are pivoted by suitable hinge pins 68, which hinge pins may be held in position in any suitable manner. As best shown in FIG. 6 of the drawings, the hinge pins 68 are disposed in suitable recesses in end caps 15 and 16, respectively.
It will be apparent that the comb locks 67 also provide access to the cutter chamber 20, and provide a ready means through which collected cuttings may be removed from this chamber.
From the above description it will be apparent that the cutting mechanism 11 and the electric motor 25 are securedto the chassis or frame member 19 to provide a subassembly. As illustrated in the drawings, the end caps 15 and 16 may be secured to this subassembly by suitable fastening means 70 (FIG. 2) which extend through suitable openings 71 (FIG. 7) in the chassis member 19 and engage tapped openings in the respective end caps 15 and 16.
For the purpose of securing this subassembly to the casing section 14, there is preferably provided a U-shaped chassis bracket 72, best shown in FIG. 2 of the drawings, which is secured to the subassembly by the same fastening means 70. This chassis bracket 72 may suitably support a terminal broad assembly 73 supporting suitable terminals 74a and 74b, which are electrically connected to the motor winding 30 in a well understood manner. The subassembly including the bracket 72 is then inserted into casing section 14 so that the chassis member 19 rests on the ledge 17 and the subassembly may be secured into position by suitable fastening means 75 extending through openings in casing section 14, as best shown in FIGS. 2 and 4 of the drawings, and threadedly engaging tapped openings in the chassis bracket 72. The casing section 14 will be provided with a suitable recess or opening 76 adjacent the terminals 74a and 74]), whereby a suitable power cord can readily be connected to these terminals through the opening 76.
In view of the detailed description included above, the operation of the electric shaver described above will readily be understood by those skilled in the art. upon energization of the winding 30, with an alternating current, the alternating flux emanating between the pole faces 31 and 32 will cause the armature 34 to oscillate, and alternately the springs 46 will have energy stored therein and will give up this energy to the cutting mechanism 11. It will be apparent, moreover, that the armature itself directly supports the cutting blades, and with this arrangement a single oscillating shaft acts both as the oscillating cutter shaft and as the armature shaft. Preferably, the natural frequency of vibration of the energy storage devices 46 is chosen to be closely akin to that of the frequency of oscillation of the motor 25. By virtue of employing six cutting blades, cutting action occurs over a large area of the comb 13 even with a small oscillating stroke.
It should be understood that the energy storage devices 46, instead of comprising springs, might comprise some other suitable means such as rubber or the like, as disclosed in copending Jepson application Serial No. 237,239, filed November 13, 1962, and assigned to the same assignee as the instant application. Moreover, instead of providing separate energy storage devices associated with a rigid shaft 33, the shaft itself might comprise both the shaft and the energy storage device, and the torsion or deflection of the shaft might be directly employed. So that the deflection of the shaft does not affect movement of the cutters away from the comb, such a shaft should preferably be rigid as far as deflection toward or away from the comb 13 is concerned, but should be flexible in a lateral direction.
While there have been illustrated and described several embodiments of the present invention, it will be apparent to those skill-ed in the art that various changes and modifications may be made without departing from the invention in its broader aspects, and it is, therefore, contemplated in the appended claims to cover all such changes and modifications as fall within the true spirit and scope of the invention.
What is claimed as new and desired to be secured by Letters Patent of the United States is:
1. An electric shaver comprising a support member having an opening defined therein, an electric motor comprising a field structure having spaced pole faces and an armature including a shaft, means for securing said field structure to said support so as to depend therefrom with said pole faces disposed in said opening, means projecting above said support for supporting said armature shaft for pivotal movement, said armature including a magnetic portion disposed in said opening cooperating with said pole faces and an upwardly projecting portion, said upwardly projecting portion adapt-ed to support cutting means.
2. The electric shaver of claim 1 wherein said armature comprises a plurality of stacked laminations, and wherein a plurality of said laminations extend upwardly and support one or more cutting blades.
3. An electric shaver comprising a housing, a chassis member secured within said housing and having a pair of aligned bearing recesses, defined therein, a shaft journaled in said recesses, a motor having an armature and field structure, said armature being supported on said shaft between said recesses, said armature including a portion receivable in an opening defined in said chassis member, said field structure being supported below said chassis member with portions extending into said opening, means projecting from said armature on the side of said armature remote from said opening for supporting cutter means, and sealing means for Preventing clippings from entering said opening.
4. The electric shaver of claim 1 wherein a pair of resilient hair seals extend between each side of said armature and said support to effectively prevent hair clippings from passing through said opening.
5. A power unit comprising a support member having an elongated opening defined therein, an electric motor comprising a field structure having elongated spaced pole faces and an armature including a shaft, means for securing said field structure to said support so as to depend therefrom with said elongated pole faces disposed in said opening and parallel with the axis of said shaft, means projecting above said support for supporting said armature shaft for oscillating movement relative to said field structure, said armature including a magnetic portion disposed in said opening cooperating with said pole faces and an upwardly projecting portion, driven means supported by said upwardly projecting portion, and energy storage means connected between said support and said shaft for storing and releasing energy as said armature and driven means decelerate and accelerate during oscillations thereof.
6. The power unit of claim 5 wherein said energy storage means comprise compression spring means.
7. In an electric shaver, the combination of a housing, an elongated support member having an elongated opening defined therein mounted in said housing, an electric motor comprising a field structure having spaced pole faces and an armature including an oscillating shaft, means for securing said field structure to said support so as to depend therefrom with said pole faces disposed in said opening, means integral with and projecting above said support at each end of said elongated opening for supporting said armature shaft for oscillating movement relative to said field structure, said armature including a magnetic portion disposed in said opening cooperating with said pole faces and spaced upwardly projecting portions for supporting a cutter and energy storage means connected between said support and said shaft for storing and releasing energy as said armature decelerates and accelerates during oscillations thereof.
8. The combination of claim 7 wherein said support includes upwardly extending spaced projections at one end thereof and said shaft includes a rocker bar secured therto and disposed between said projections, said energy storage means comprising compression springs interposed between said rocker bar and upwardly extending spaced projections.
9. The electric shaver of claim 7 wherein hair seals in the form of elongated resilient members are connected in sealed relationship between said armature and said support on either side of said armature thereby to seal said opening against the passage of foreign matter therethrough.
10. In an electric shaver of the type having an oscillating cutter shaft the combination of a housing, an alternating current electric motor comprising an oscillating armature, an oscillating shaft for said armature, said shaft also functioning as the oscillating cutter shaft, said armature being laminated and including projections of the laminations for supporting a cutter member, and energy storage 'means connected to said armature to bias said oscillating armature to a rest position.
11. The electric shaver of claim 10 wherein the natural frequency of vibration of said energy storage means is of the order of the frequency of the alternating current supplied to said electric motor.
12. In a dry shaver of the type having an oscillating cutter shaft the combination of a laminated armature supported by said shaft and having a pair of spaced elongated salient poles extending parallel to said shaft, a U-shaped field having elongated spaced pole faces equidistant from the axis of said shaft and extending parallel to said shaft, resilient means biasing said armature to a rest position with said poles displaced from said pole faces, and field coil means for creating magnetic flux at said pole faces to move said armature poles toward said pole faces.
13. An electric shaver comprising a housing, an electric motor for powering said shaver having an oscillating armature, said armature being provided on either side thereof with a T-shaped slot, and resilient means including cooperating T-shaped portions receivable in said T-shaped slots for providing a hair seal.
14. A power unit comprising -a support member having an opening defined therein, an electric motor comprising a field structure having spaced pole faces and an armature including a shaft, means for securing said field structure to said support so as to depend therefrom with said pole faces disposed, in said opening, means projecting above said support for supporting said armature shaft for pivotal movement, said armature including a magnetic portion disposed in said opening cooperating with said 1 pole faces and an upwardly projecting portion, and driven means supported by said upwardly projecting portion.
References Cited by the Examiner UNITED STATES PATENTS Baney 310-20 Jepson 30-34 X Iepson 30-43.9 Bulova et a1 30-439 Dechaux 30-439 Tolmie 310-39 X Camp 310-38 X Great Britain.
5 WILLIAM FELDMAN, Primary Examiner.

Claims (1)

1. AN ELECTRIC SHAVER COMPRISING A SUPPORT MEMBER HAVING AN OPENING DEFINED THEREIN, AN ELECTRIC MOTOR COMPRISING A FIELD STRUCTURE HAVE SPACED POLE FACES AND AN ARMATURE INCLUDING A SHAFT, MEANS FOR SECURING SAID FIELD STRUCTURE TO SAID SUPPORT SO AS TO DEPEND THEREFROM WITH SAID POLE FACES DISPOSED IN SAID OPENING, MEANS PROJECTING ABOVE SAID SUPPORT FOR SUPPORTING SAID ARMATURE SHAFT FOR PIVOTAL MOVEMENT, SAID ARMATURE INCLUDING A MAGNETIC PORTION DISPOSED IN SAID OPENING COOPERATING WITH SAID POLE FACES AND AN UPWARDLY PROJECTING PORTION, SAID UPWARDLY PROJECTING PORTION ADAPTED TO SUPPORT CUTTING MEANS.
US246488A 1962-12-21 1962-12-21 Electric dry shaver Expired - Lifetime US3213301A (en)

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US246488A US3213301A (en) 1962-12-21 1962-12-21 Electric dry shaver
GB4006063A GB1018428A (en) 1962-12-21 1963-10-10 Electric dry shaver
DES87819A DE1208218B (en) 1962-12-21 1963-10-11 Electric shaver
FR953268A FR1378352A (en) 1962-12-21 1963-11-09 Dry running electric shaver
US44597365 US3290776A (en) 1962-12-21 1965-04-06 Electric dry shaver with common shaft for cutter and motor

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US (1) US3213301A (en)
DE (1) DE1208218B (en)
GB (1) GB1018428A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4012837A (en) * 1974-07-23 1977-03-22 The Gillette Company Dry shavers
US4365542A (en) * 1980-03-17 1982-12-28 Hitachi, Ltd. Electric fan
US4509259A (en) * 1981-06-15 1985-04-09 Matsushita Electric Works, Ltd. Electric shaver
US4594778A (en) * 1984-03-21 1986-06-17 U.S. Philips Corporation Shaving unit
CN103624816A (en) * 2013-09-08 2014-03-12 史大涌 Swing type reciprocating electric shaver

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US968729A (en) * 1908-04-24 1910-08-30 James Kennedy Electromagnetic drill.
GB594770A (en) * 1944-04-27 1947-11-19 Martin Brothers Electric Co Improvements in or relating to electric motors of the oscillating armature type
US2530302A (en) * 1947-10-29 1950-11-14 Sunbeam Corp Case for motor units
US2797479A (en) * 1949-01-21 1957-07-02 Sunbeam Corp Electric dry shaver
US2982020A (en) * 1956-04-03 1961-05-02 Bulova Watch Co Inc Electric dry shaver with grill tensioning means
US3028668A (en) * 1960-08-16 1962-04-10 Dechaux Charles Dry shaver with rocking cutter
US3086133A (en) * 1957-12-23 1963-04-16 Sperry Rand Corp Motor for ladies' shavers
US3105163A (en) * 1961-03-31 1963-09-24 Schick Inc Electric shaver reciprocating motor-drive unit

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GB630749A (en) * 1939-11-01 1949-10-20 John Bruecker Shaving implement
FR1051268A (en) * 1951-02-05 1954-01-14 Electric shaver with oscillating motor
FR1286708A (en) * 1960-01-11 1962-03-09 Sperry Rand Corp Electric razor knife drive mechanism
FR1292767A (en) * 1961-03-31 1962-05-04 Schick Inc Electric razor improvements

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US968729A (en) * 1908-04-24 1910-08-30 James Kennedy Electromagnetic drill.
GB594770A (en) * 1944-04-27 1947-11-19 Martin Brothers Electric Co Improvements in or relating to electric motors of the oscillating armature type
US2530302A (en) * 1947-10-29 1950-11-14 Sunbeam Corp Case for motor units
US2797479A (en) * 1949-01-21 1957-07-02 Sunbeam Corp Electric dry shaver
US2982020A (en) * 1956-04-03 1961-05-02 Bulova Watch Co Inc Electric dry shaver with grill tensioning means
US3086133A (en) * 1957-12-23 1963-04-16 Sperry Rand Corp Motor for ladies' shavers
US3028668A (en) * 1960-08-16 1962-04-10 Dechaux Charles Dry shaver with rocking cutter
US3105163A (en) * 1961-03-31 1963-09-24 Schick Inc Electric shaver reciprocating motor-drive unit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4012837A (en) * 1974-07-23 1977-03-22 The Gillette Company Dry shavers
US4365542A (en) * 1980-03-17 1982-12-28 Hitachi, Ltd. Electric fan
US4509259A (en) * 1981-06-15 1985-04-09 Matsushita Electric Works, Ltd. Electric shaver
US4594778A (en) * 1984-03-21 1986-06-17 U.S. Philips Corporation Shaving unit
CN103624816A (en) * 2013-09-08 2014-03-12 史大涌 Swing type reciprocating electric shaver

Also Published As

Publication number Publication date
GB1018428A (en) 1966-01-26
DE1208218B (en) 1965-12-30

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