US3206850A - Electric dry shaver wherein the cutter shaft is mounted in a rubberlike material - Google Patents

Electric dry shaver wherein the cutter shaft is mounted in a rubberlike material Download PDF

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Publication number
US3206850A
US3206850A US237239A US23723962A US3206850A US 3206850 A US3206850 A US 3206850A US 237239 A US237239 A US 237239A US 23723962 A US23723962 A US 23723962A US 3206850 A US3206850 A US 3206850A
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United States
Prior art keywords
oscillating
shaft
cutter
cutter shaft
motor
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Expired - Lifetime
Application number
US237239A
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English (en)
Inventor
Jepson Ivar
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.)
Sunbeam Corp
Original Assignee
Sunbeam Corp
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Filing date
Publication date
Application filed by Sunbeam Corp filed Critical Sunbeam Corp
Priority to US237239A priority Critical patent/US3206850A/en
Priority to GB33158/63A priority patent/GB1018427A/en
Priority to FR946770A priority patent/FR1369105A/fr
Priority to CH1257663A priority patent/CH411618A/de
Priority to US410115A priority patent/US3244916A/en
Application granted granted Critical
Publication of US3206850A publication Critical patent/US3206850A/en
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
    • B26B19/12—Clippers 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

Definitions

  • the present invention relates to apparatus for removing beards or face hair as well as for removing hair from the arms, legs and other portions of the human body, and is generally referred to as an electric dry shaver. More particularly, the present invention is in the nature of an improvement over the electric dry shaver disclosed and claimed in copending Jepson and Schuessler application Serial No. 109,551, tiled May 12, 1961, and assigned to the same assignee as the present application.
  • the electric dry shaver disclosed in the above-mentioned copending Jepson and Schuessler application 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 plurality of spaced parallel blades travels back and forth across the comb at high speed and is shrown by centrifugal force against the inside surface of the comb, thus providing a very satisfactory cutting action with the comb.
  • the cutter blades float in a cutter head and shaft assembly that is also oscillated by a powerful electric motor with the cutter blades oscillating on the order of 8,500 cycles per minute.
  • the oscillating shaft for the cutting blades is supported in spaced bearings and the manufacturing cost of such a shaver is substantial due to the requirement of bearings which must be carefully aligned and which must either be lubricated or comprise bearings of the self-lubricating nature. It would be desirable to provide an arrangement in which the bearings for the oscillating cutter shaft could be completely eliminated, thereby eliminating the cost of such bearings, the more complicated assembly thereof and all misalignment problems with respect thereto.
  • Still another object of the present invention resides in an electric dry shaver having a rotating motor feeding power to an oscillating cutter mechanism 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 ystop and, moreover, overcome the inertia with respect to movement in the opposite direction.
  • FIG. 1 is a fragmentary, longitudinal sectional view taken along a plane passing substantially through the axes of the shafts of the rotating motor and oscillating cutter of an electric dry shaver embodying the present invention
  • FIG. 2 is a sectional view taken on line 2-2 of FIG. 1 assuming that FIG. 1 shows the complete structure
  • FIG. 3 is a sectional view taken on line 3-3 of FIG. 1 again assuming that FIG. 1 shows the complete structure
  • FIG. 4 is a sectional View taken on line 4-4 of FIG. 1 assuming that FIG. 1 shows the complete structure
  • FIG. 5 is an enlarged fragmentary sectional view of the supporting means for the oscillating shaft of the cutter mechanism.
  • FIG. 6 is an exploded perspective view of the oscillating blade supporting mechanism and the means for supporting the same in the electric dry shaver of the present invention.
  • the present invention is concerned with an improved oscillating cutter assembly for an electric dry shaver wherein the bearings for the oscillating cutter shaft are completely eliminated and instead the ends of this cutter shaft are resiliently mounted.
  • the ends of the cutter shaft are secured to blocks of a rubberlike material whereby beanings and lubrication problems are completely eliminated, the alignment problem is eliminated and a greatly reduced power requirement is obtained since energy stored in the resilient support is fed back into the power system at each end of the oscillating stroke, thereby overcoming the inertia inherent in a device which must stop and reverse its direction of movement.
  • the resilient means for mounting the oscillating shaft is preferably chosen to have a natural frequency of Vibration which approaches the frequency of oscillation of the cutter mechanism.
  • the resilient support means must be such as to be unaffected by the various shaving lotions that might be employed and unaffected by ozone which is produced with a commutator-type motor. Due to the resonant condition and the fact that energy is stored in the resilient supports and is released to overcome the inertia of the oscillating shaft and blade assembly at each end of the stroke, a substantial reduction in power requirements results. This reduction is between twenty and ifty percent.
  • the resilient mounting means for the oscillating shaft effectively provides a stop to cushion the oscillating cutters at each end of the stroke. Moreover, it is unnecessary to counterbalance the cutter assembly with this type of arrangement.
  • the electric dry shaver embodying the present invention is generally designated by the reference numeral 10. Since the present invention is primarily concerned with the oscillating cutter mechanism and the power train and power supplying mechanism connected therewith, only fragmentary views of the entire shaver are shown. lt should be understood, however, that this shaver might otherwise be very similar to that disclosed in the above-mentioned Jepson and Schuessler application. Moreover, the general construction of the shaver may be very similar to that disclosed and claimed in a copending application Serial No. 322,- 795, Jepson, Schuessler, Jackson and Jensen, filed November 12, 1963, also assigned to the same assignee as the instant application.
  • the shaver cornprises a cutting mechanism generally designated at 11 comprising a plurality of cutting blades 12, only one of which is Visible in the drawings, coacting with a comb or stationary cutting member 13.
  • the comb and cutting mechanism are associated with a suitable casing comprising three parts 14, and 16, the comb 13 preferably comprising a substantial portion of the surface of the casing.
  • the particular construction of the casing portions 14, 15 and 16 forms no part of the present invention but may be very similar to the corresponding parts disclosed in the copending Jepson and Schuessler application referred to above.
  • a suitable electric motor Housed within the casing, comprising portions 14, 15 and 16, is a suitable electric motor, generally designated at 18, which is adapted to be connected by suitable driving means, generally designated at 19, with the cutter mechanism 11 in order to cause oscillation of this cutter mechanism at a speed of the order of 8,500 cycles per minute.
  • the casing for the electric shaver is of boxlike configuration so that it may readily be held in the hand of the user and no further discussion of this feature is included herein.
  • the casing is manufactured in three sections, as described in the aforesaid copending applications, in order to facilitate assembly of the electric dry shaver 10.
  • the casing section 14 preferably molded from a suitable plastic material is a rectangular cup-shaped member having an open top and a closed bottom (not shown).
  • the casing sections 15 and 16 are effectively end caps which may be molded of a suitable plastic material in the same manner as the casing section 14.
  • the end cap 15 was molded of a plastic material while the end cap 16 was made as a die casting of a suitable metal.
  • the shaver 10 includes a molded insulating support or chassis 20 to which the cutter assembly 11 and the motor 18 are mounted in the manner described hereinafter.
  • the member or chasis 20 When the member or chasis 20 is associated with the shaver 10, it actually divides the shaver casing into two chambers-a motor chamber 21 disposed beneath the chassis 20, as viewed in FIG. l of the drawings, and a cutting chamber 22 disposed above the member 20.
  • the underside of the chasis member 20 is provided with a pair of downwardly directed spaced projecting portions 20a and 2Gb terminating in spherical surfaces for retaining spherical motor bearings 23 and 24, respectively.
  • the portions 20a and 201; are provided with recesses 25 and 26, respectively, for receiving suitable oil wicks 27 preferably saturated with a suitable lubricant.
  • a portion defining a recess 28 for accommodating the armature 29 of the motor 18 which is supported on a shaft 30 journalled in the bearings 23 and 24.
  • the bearings 23 and 24 are secured within the spherical recesses defined at the lower end of the projections 20a and 20h of the chassis 20 by suitable bearing retainers 32 and 33, respectively, which thereby hold the motor 29 in assembled relationship with the chassis 20.
  • the bearing retainer 32 which might be termed the commutator end bearing retainer, is suitably secured to the chassis 20 by screws or other fastening means 41 which actually extend through the chassis into tapped openings in the end cap 15, thereby simultaneously securing the bearing retainer 32 and the end cap 15 in assembled relationship with the chassis 20.
  • the bearing retainer 33 on the other hand, which might be termed the crank end bearing retainer, is secured to the chassis 20 by suitable screws or fastening means 36, best shown in FIGS. 2 and 3 of the drawings.
  • the chassis 20 is further provided with a downwardly projecting support member 20c only a portion of which is shown in the drawings for supporting suitable terminal pins whereby electrical connection may be made for energizing the electric motor of the present invention. If it is desired to provide a separate switch built into the shaver housing as is shown in the above-mentioned Jepson and Schuessler application, Serial No. 109,551, then the projection 20c may support a suitable switch supporting member which, in turn, may also support the electrical terminals.
  • the particular construction of the motor 18 forms no part of the present invention, but as disclosed in Jepson Patent 2,688,184 includes a commutator 39 With which is associated a brush terminal assembly 40 (FIG. l) suitably secured to the chassis 20 by fastening means, not shown.
  • crank and counterweight means including a counterweight 43 and a crank pin 44.
  • the crank pin 44 is connected to one end of a connecting rod 45 preferably formed of nylon which extends through an opening 46 (FIGS. 1, 2 and 6) in the chassis 20.
  • the motor 18 includes the conventional field structure very similar to that shown in the above-mentioned Jepson patent. Only the laminations 47 are visible in FIGS. l and 2 of the drawings.
  • laminations include a portion surrounding the armature 29, as is well understood by those skilled in the art, and a field winding, not shown, surrounds a portion of these laminations.
  • the field structure including the laminations 47 is supported from chassis 20 by a pair of bail clamps 48, which in turn are supported by a molded bail hanger 49 resting on the top of chassis 20.
  • the chassis 20 is provided with suitable openings through which the bail clamps 48 may extend to engage the bail hanger 49.
  • the chassis 20 is provided with a peripheral laterally projecting flange 20d which is adapted to engage a cooperating ledge 50 defined around the periphery of the open end of the cup-shaped casing portion 14, as best shown in FIGS. 1, 2, 3 and 4 of the drawings.
  • the subassembly comprising the chassis Ztl, to which have been secured the armattue and field structure described heretofore of motor 18, as well as the cutting mechanism 11 to be described and the end caps 15 and 16, is then associated with the cup-shaped casing section 14 by inserting the depending portion thereof into this casing section, whereupon the latter can then be secured to suitable means supported by the bail clamps 4S to complete the assembly.
  • a comb lock spring 51 (FIGS. 1 and 6) which is interposed between the chassis 2t) and the bail hanger 49.
  • the chassis 20 may be provided with integral projections, such as Ztie (FIG. l) for temporarily retaining the comb lock spring 51 in position during assembly.
  • Ztie FIG. l
  • the bail clamps 4S clamp the comb lock spring between chassis 20 and bail hanger 49 upon final assembly of all parts.
  • the cutter assembly 11 includes a cutter shaft 52 disposed in spaced parallel relationship with the motor shaft 30. ln order resiliently to support a plurality of cutter blades, such as 12, for oscillation with the cutter shaft 52, the latter is provided with a plurality of upwardly extending supports 53a, 53h, 53e and 53d which may be identical with those disclosed in the above-mentioned copending Jepson and Schuessler application. These supports are of triangular shape and are rigidly secured to the cutter shaft 52.
  • the chassis 20 is provided with a pair of upwardly projecting support portions 207c and 20g, each of which is provided with an upwardly directed V-shaped notch 57 and 58, respectively.
  • These V-shaped notches 57 and 58 are respectively adapted to receive therein the resilient supports 54 and 55 bonded to shaft 52.
  • the end caps 15 and 16 are provided with cooperating V-shaped notches 59 and 60, respectively.
  • end cap is provided with a projection 15a having arcuately arranged comb supporting surfaces 15b.
  • this projection 15a is provided with the downwardly directed V-notch 59 cooperating with the V-notch 57 in the support 20] so as to clamp the resilient block of neoprene rubber 54 into fixed position relative to chassis 20.
  • the end cap 16 is provided with a projection 16a having a downwardly directed V-notch 60 whereby the resilient support 55 may be clamped into position within the cooperating notches 58 and 60.
  • End cap 16 is also provided with arcuately arranged comb supporting surfaces 16h (FIG. 3).
  • screws such as 41 (FIGS. 1 and 4) clamp the end cap 15 to the chassis 20 simultaneously holding the commutator end bearing retainer 32 and, hence, the bearing 23 in position and also clamping the resilient support 54 in fixed position.
  • a pair of screws 62 (FIG. 2) are provided for clamping the end cap 16 to the chassis 20 and simultaneously clamping the resilient support 55 for the oscillating shaft 52 in position.
  • the driving means 19 includes a combined crank and counterweight comprising crank pin 63 and counterweight 64 secured to the end of oscillating shaft 52 adjacent the crank end of motor shaft 30, the shafts 30 and 52 being substantially coextensive.
  • the crank pin 63 is adapted to be connected to the other end of connecting rod 45, this connecting rod passing through opening 46 in chassis 20.
  • the resilient blocks 54 and 55 had a natural frequency of vibration of between 5500 and 7500 cycles per minute. These blocks were made of neoprene rubber and had a Durometer hardness of between 40 and 45. This material was resistant to ozone gas, had a tensile breaking stress of at least 3500 pounds and met many tests with respect to resiliency, compression set, elongation, and the like. The material should be resilient enough so as not excessively to increase the starting torque and yet should have sufficient hardness to store a substantial amount of energy when the blocks are stressed in torsion.
  • the operation of the electric shaver of the present invention will readily be understood by those skilled in the art.
  • the electric motor 18 rotates, it causes oscillation of the cutter shaft 52 stressing the resilient blocks 54 and 55 in torsion as the oscillating cutter mechanism moves from one end of its stroke to the other.
  • Energy is stored in these resilient blocks as the cutting mechanism moves to the end of its stroke.
  • the blocks cushion the mechanism to a stop and the stored energy in the resilient blocks then overcomes the inertia of the moving parts and gives up this energy in producing movement in the opposite direction. Consequently, a smaller motor is required 7 and much more etlicient utilization of the output of the motor 1S is accomplished.
  • the theoretical ideal condition would be to have the energy storage means tuned to the frequency of oscillation produced by the prime mover. It has been found, however, that this requires energy storage means of such stiffness that a practical prime mover would not be able to produce sufficient torque to initiate oscillation of the system. For this reason the natural frequency of the energy storage means is tuned to a frequency lower than the frequency of oscillation of the oscillating cutter mechanism.
  • an electric motor comprising a rotating shaft, an oscillating cutting means including a cutter shaft disposed in spaced parallel relationship with respectl to said motor shaft, means interconnecting said shafts to convert rotary motion of said motor shaft to oscillating motion of said cutter shaft, and resilient means secured to said cutter shaft, said resilient means being stressed in torsion first in one direction and then in the other upon oscillation of said cutter shaft.
  • An electric shaver comprising a housing, an electric motor including .a rotatable shaft mounted in said housing, an oscillating c'utting means supported in said housing including an oscillating cutter shaft disposed in spaced parallel relationship with respect to said motor c shaft, means interconnecting said shafts to convert rotary motion of said motor shaft to oscillating motion of said cutter shaft, and resilient means encompassing and firmly secured to the ends of said cutter shaft, said resilient means being held in fixed position in said housing and stressed in torsion upon oscillation of said cutter shaft.
  • An electric shaver comprising a housing, an electric motor including a rotatable shaft mounted in said housing, an oscillating cutting means supported in said housing including an oscillating cutter shaft disposed in spaced parallel relationship with respect to Said motor shaft, means interconnecting said shafts to convert rotary motion of said motor shaft to oscillating motion of said cutter shaft, a first rectangular block of rubber bonded to one end of said cutter shaft, a second rectangular block'of rubber bonded to the other end of said cutter shaft, means for clamping said blocks of rubber in stationary position in said housing whereby oscillation of said cutter shaft causes said blocks of rubber to be stressed in torsion, said rubber blocks storing energy from said prime mover when said cutter shaft is moved toward the extreme ends of its oscillating stroke and returning energy to said oscillating cutting means when said cutter shaft is moved away from the extreme ends of its oscillating stroke.
  • An electric shaver comprising a housing, an electric motor including a rotatable shaft mounted in said housing, an oscillating cutter mechanism supported in said housing including an oscillating cutter shaft disposed in spaced parallel relationship with respect to said motor shaft, means interconnecting said shafts to convert rotary motion of said motor shaft to oscillating motion of said cutter shaft, a first rectangular block of rubber bonded to one end of said cutter shaft, a second rectangular block of rubber bonded to the other end of said cutter shaft, means in said housing defining opposed V-shaped grooves for clamping said blocks of rubber in stationary position in said housing when said housing is fully assembled whereby oscillation of said cutter shaft causes said blocks of rubber to be stressed in torsion, said rubber blocks storing energy from said prime mover when said cutter mechanism is moved toward the extreme ends of its oscillating stroke and returning energy to said cutter mechanism when said cutter mechanism is moved away from the extreme ends of its oscillating stroke, said stored energy overcoming the inertia of said cutter mechanism as it reverses its direction of movement.

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dry Shavers And Clippers (AREA)
US237239A 1962-11-13 1962-11-13 Electric dry shaver wherein the cutter shaft is mounted in a rubberlike material Expired - Lifetime US3206850A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US237239A US3206850A (en) 1962-11-13 1962-11-13 Electric dry shaver wherein the cutter shaft is mounted in a rubberlike material
GB33158/63A GB1018427A (en) 1962-11-13 1963-08-21 Electric dry shaver
FR946770A FR1369105A (fr) 1962-11-13 1963-09-06 Rasoir électrique fonctionnant à sec
CH1257663A CH411618A (de) 1962-11-13 1963-10-14 Mit einer Antriebsvorrichtung ausgerüstetes Gerät, insbesondere Trockenrasiergerät
US410115A US3244916A (en) 1962-11-13 1964-11-10 Rotary power device with motion conversion means

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US237239A US3206850A (en) 1962-11-13 1962-11-13 Electric dry shaver wherein the cutter shaft is mounted in a rubberlike material

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GB (1) GB1018427A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3348307A (en) * 1967-01-26 1967-10-24 Sunbeam Corp Shaver head release
US3401453A (en) * 1966-05-27 1968-09-17 Sunbeam Corp Electric dry shaver
US3421215A (en) * 1966-05-27 1969-01-14 Sunbeam Corp Electric shaver
US3432701A (en) * 1965-12-22 1969-03-11 Philips Corp Vibration damping suspension for an electric motor
US4594778A (en) * 1984-03-21 1986-06-17 U.S. Philips Corporation Shaving unit
WO2002064327A1 (de) * 2001-01-02 2002-08-22 Franz Nase Klingenblock eines trockenrasierers der schwingenden bauart
US20110225827A1 (en) * 2010-03-19 2011-09-22 Moseman Russell L Movable lubricating wick for hair clipper

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US891788A (en) * 1907-07-02 1908-06-23 1900 Washer Company Washing-machine.
US968729A (en) * 1908-04-24 1910-08-30 James Kennedy Electromagnetic drill.
US1051923A (en) * 1910-01-15 1913-02-04 Donald Cameron Mechanical movement and machine embodying same.
US2237575A (en) * 1937-12-31 1941-04-08 Orpheus F Quartullo Resilient torsion spring suspension
US2238435A (en) * 1938-08-17 1941-04-15 Reeves Pulley Co Bearing bushing
US2549561A (en) * 1948-02-26 1951-04-17 Baker Mfg Co Motion converting mechanism
US2688184A (en) * 1949-01-21 1954-09-07 Sunbeam Corp Electric dry shaver
US2719711A (en) * 1948-12-20 1955-10-04 Daimler Benz Ag Link joint
US2726445A (en) * 1953-12-08 1955-12-13 Leslie Krueger Electric shaver
US2903789A (en) * 1956-06-18 1959-09-15 Bulova Watch Co Inc Belt drive means for an oscillating type of dry shaver
US3059361A (en) * 1961-09-08 1962-10-23 Fredda F S Sieve Tray calendar

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US891788A (en) * 1907-07-02 1908-06-23 1900 Washer Company Washing-machine.
US968729A (en) * 1908-04-24 1910-08-30 James Kennedy Electromagnetic drill.
US1051923A (en) * 1910-01-15 1913-02-04 Donald Cameron Mechanical movement and machine embodying same.
US2237575A (en) * 1937-12-31 1941-04-08 Orpheus F Quartullo Resilient torsion spring suspension
US2238435A (en) * 1938-08-17 1941-04-15 Reeves Pulley Co Bearing bushing
US2549561A (en) * 1948-02-26 1951-04-17 Baker Mfg Co Motion converting mechanism
US2719711A (en) * 1948-12-20 1955-10-04 Daimler Benz Ag Link joint
US2688184A (en) * 1949-01-21 1954-09-07 Sunbeam Corp Electric dry shaver
US2726445A (en) * 1953-12-08 1955-12-13 Leslie Krueger Electric shaver
US2903789A (en) * 1956-06-18 1959-09-15 Bulova Watch Co Inc Belt drive means for an oscillating type of dry shaver
US3059361A (en) * 1961-09-08 1962-10-23 Fredda F S Sieve Tray calendar

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3432701A (en) * 1965-12-22 1969-03-11 Philips Corp Vibration damping suspension for an electric motor
US3401453A (en) * 1966-05-27 1968-09-17 Sunbeam Corp Electric dry shaver
US3421215A (en) * 1966-05-27 1969-01-14 Sunbeam Corp Electric shaver
US3348307A (en) * 1967-01-26 1967-10-24 Sunbeam Corp Shaver head release
US4594778A (en) * 1984-03-21 1986-06-17 U.S. Philips Corporation Shaving unit
WO2002064327A1 (de) * 2001-01-02 2002-08-22 Franz Nase Klingenblock eines trockenrasierers der schwingenden bauart
US20110225827A1 (en) * 2010-03-19 2011-09-22 Moseman Russell L Movable lubricating wick for hair clipper
US8555511B2 (en) * 2010-03-19 2013-10-15 Wahl Clipper Corporation Movable lubricating wick for hair clipper

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CH411618A (de) 1966-04-15
GB1018427A (en) 1966-01-26

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