US3553837A - Cutter head for a dry shaver - Google Patents

Cutter head for a dry shaver Download PDF

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Publication number
US3553837A
US3553837A US789859A US3553837DA US3553837A US 3553837 A US3553837 A US 3553837A US 789859 A US789859 A US 789859A US 3553837D A US3553837D A US 3553837DA US 3553837 A US3553837 A US 3553837A
Authority
US
United States
Prior art keywords
cutter
lower cutter
springs
cutters
trimmer
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
US789859A
Other languages
English (en)
Inventor
Reinhard Konig
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.)
CARINTHIA ELEKTROGERAETE GmbH
Carinthia Elektrogerate Firma GmbH
Original Assignee
CARINTHIA ELEKTROGERAETE GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by CARINTHIA ELEKTROGERAETE GmbH filed Critical CARINTHIA ELEKTROGERAETE GmbH
Application granted granted Critical
Publication of US3553837A publication Critical patent/US3553837A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • B26B19/02—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers of the reciprocating-cutter type
    • B26B19/04—Cutting heads therefor; Cutters therefor; Securing equipment thereof
    • 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
    • B26B19/02—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers of the reciprocating-cutter type
    • B26B19/04—Cutting heads therefor; Cutters therefor; Securing equipment thereof
    • B26B19/10—Cutting heads therefor; Cutters therefor; Securing equipment thereof involving two or more different types of reciprocating cutting elements, e.g. a pair of toothed shearing elements combined with a pair of perforated cutting elements or a combined toothed and perforated cutting assembly
    • 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
    • B26B19/282—Motors without a rotating central drive shaft, e.g. linear motors

Definitions

  • the lower cutter for the razor part which cooperates with the perforated cutter foil, is made integral with the lower cutter of the trimmer, so that both lower cutters can be driven in unison.
  • Springs, acting against this unitary part which forms the lower cutters provide for pressing against the associated upper cutters.
  • the lower cutters for the razor part and for the trimmer are made separately from one another. These separate lower cutters are each pressed against the associated upper cutter by a spring arrangement. In this way, a better engagement of the cutting surfaces of the co-operating cutters is indeed ensured, but the separate arrangement of springs gives an expensive total construction and also a relatively complicated assembly of the indivdual parts.
  • the force, with which the lower cutter for the razor part is pressed against the associated upper cutter is constant at every stage of the movement, so that an especially uniform engagement of the lower cutter of the razor part with the perforated cutter foil is ensured, which, as mentioned, is decisive for a good shaving performance.
  • an intermediate member is provided as a driving connection, which on the one hand is connected to one of the two lower cutters pivotally, and moveable perpendicular to its reciprocating direction of motion, and on the other hand is connected fixedly to the other lower cutter, for example with snap connec tions.
  • a particularly simple construction can be obtained with a cutter head, in which the lower cutter for the razor part has a driving bar, with which a fork-shaped driving member of the dry shaver engages, in that the intermediate member is arranged on the driving bar of the lower cutter of the razor part by means of two lugs having longitudinal slits, and the lower cutter for the trimmer is fixedly connected to the intermediate member.
  • the intermediate member is formed as a frame extending between the cutter head frame and the lower cutter for the razor part, while each of the two springs of a spring arrangement engages on a short side of the frame.
  • the intermediate member is guided in its longitudinal direction by its longitudinal frame sides on sliding surfaces of the cutter head frame.
  • the intermediate member advantageously has abutment surfaces, with which the lower cutter for the razor part comes into engagement during use of the razor part, by reason of the additional razor pressure which arises, so soon as this exceeds the strength of the spring of each spring arrangement which abuts the lower cutter of the razor part. Then with high shaving pressure, the lower cutter for the razor part engages with the intermediate member, and carries this with it, so that the lower cutter which is coupled to the intermediate member is also taken with it and thus lifted away from the upper cutter associated with it.
  • FIG. 1 shows in longitudinal section and FIG. 2 in section on the line IIII in FIG. 1 a first constructional example, in which two spring arrangements containing coil springs are provided.
  • FIG. 3 a second constructional example is shown, again in longitudinal section, and in FIG. 4 in section on the line IVIV in FIG. 3, in which the driving connection between the lower cutters takes place through an intermediate member.
  • FIG. 5 shows a further constructional example, in which the spring arrangements contain springs of a different kind.
  • FIG. 6 an example with a single spring arrangement is shown, in longitudinal section, and in FIG. 7 in section on the line VIIVII in FIG. 6.
  • a cutter head frame is indicated at 1, on which is arranged a perforated cutter foil 2, as the upper cutter for the razor part.
  • a perforated cutter foil 2 As the upper cutter for the razor part.
  • the upper cutter 4 of a trimmer having cutter teeth.
  • Lower cutters 5 and 6 respectively each co-operate with these two stationary upper cutters.
  • the lower cutter 5 which co-operates with the perforated cutter foil, is for this purpose made curved in shape, and consists of individual strips, the cutting edges of which are shown schematically by lines 7; bars 8 serve to stiffen the lower cutter.
  • the lower cutter 6 of the trimmer is formed by a plate, which carries a row of cutter teeth 9 on one longitudinal side.
  • two spring arrangements 10 are now provided, while each consists of two springs 11 and 12 lying mechanically in series.
  • the springs 11 at the same time abut with one end against the cutter head frame 1, and the springs 12 at the same time each abut with one end against a bar 8 of the lower cutter 5 for the razor part.
  • the other ends of the two springs 11, 12 are connected together through double spring discs 13, which in turn are in operative connection with the lower cutter 6 of the trimmer, in that they are fitted in openings 14 in the lower cutter plate.
  • the strength of the springs 11 is greater than the strength of the springs 12, so that the springs 11, via the spring discs 13, press the lower cutter 6 of the trimmer with the row of cutting teeth 9 against the upper cutter 4 of the trimmer, while the edge of the lower cutter plate 6 lying opposite to the row of teeth 9 abuts a strip 15 provided on the cutter head frame, and the springs 12 press the lower cutter 5 for the razor part into the curved concave perforated cutter foil 2. In this way the upper and lower cutters both of the razor part and of the trimmer engages one another fully.
  • the two lower cutters 5 and 6 are in themselves separate components. However there is provided a driving connection between them, which ensures an identical working motion for both lower cutters, so that the drive of the dry shaving apparatus need only engage one of the lower cutters.
  • connection is formed by a pin 16 provided on the lower cutter 5 for the razor part, which extends, with some play, through openings 17 in the lower cutter plate 6 of the trimmer. Furthermore, on the lower cutter 5 for the razor part there is arranged a driving pin 18, with which engages a forkshaped oscillating lever 20- of the drive portion of the dry shaver arranged in the housing 21, which extends through an opening 19 in the lower cutter plate 6 of the trimmer. During oscillation of the lever, the lower cutter 5 for the razor part thus likewise performs an oscillating motion.
  • the driving connection 16 17 between the two lower cutters 5, 6, this motion of the lower cutter 5 is also identically transmitted to the lower cutter 6 of the trimmer.
  • the two lower cutters are thus displaced to and fro parallel to one another, while each individually engages fully with the upper cutter associated with it.
  • an intermediate member 22 is provided as the driving connection between the lower cutters 5 and 6.
  • This is formed as a frame, and extends between the cutter head frame 1 and the lower cutter 5 for the razor part, while at the same time the two springs 11 and 12 of a spring arrangement, which lie mechanically in series, engage on a small side 23 of the frame.
  • the longitudinal sides 24 of the frame cooperate with sliding surfaces 25 provided on the cutter head frame 1, so that the intermediate member is guided in its longitudinal direction and thus performs an exact reciprocating motion.
  • the cutter head has two trimmers, and in fact an upper cutter 4 for a trimmer is formed on each longitudinal frame side 3.
  • the lower cutter 6 for these trimmers is likewise formed as a frame, while a row of cutter teeth 9 is provided on each longitudinal side of the frame.
  • This lower cutter is mounted by means of its central opening 26 on the intermediate member 22, while it is secured to it with a snap device, which is formed by noses 27 provided on the intermediate member.
  • a lug 28 is arranged, in which a longitudinal slit 28a, contracting towards its mouth, is provided.
  • the intermediate member 22 is pivotally connected with the driving pin 18, which also serves for connection with the driving portion of the apparatus, not shown here.
  • the intermediate member 22 is however not only pivotally arranged, but also movable perpendicularly to the reciprocating direction of the lower cutter 5, on the driving pin 18.
  • the contraction of the slits at their mouths serves to ensure that during assembly of the cutter head, the intermediate member cannot drop unintentional from the driv- .ing pin. In this way the driving connection of the two lower cutters 5 and 6 is formed, so that the lower cutter 6 of the trimmers follows identically the working movement of the lower cutter for the razor part.
  • the intermediate member here operates as a guiding and driving part for the lower cutter of the trimmers and also as a guiding part for the spring arrangements.
  • the intermediate member On driving of the lower cutter for the razor part, the intermediate member is identically driven, so that the springs 12 again are moved parallel to them selves, and always perpendicular to the lower cutter of the razor part, and only the springs 11 are tilted to some extent.
  • both lower cutters engage, each in themselves, with the associated upper cutter.
  • the intermediate member 22 furthermore has abutment surfaces 29 on the small sides 23 of the frame, which lie beneath the lower cutter 5 for the razor part, and against which the lower cutter can engage. If, during use of the razor part, a larger force is exerted on the latter, then the friction between upper and lower cutter increases, so that the driving part must supply more power, so that the same amplitude of oscillation remains.
  • a reserve of power can however only be provided, if the friction between the upper and lower cutters of the trimmers is reduced during larger shaving pressure, so that this energy can then be also available for the drive of the razor part. In these circumstances this is achieved, because whenever the shaving pressure exceeds the strength of the springs 12, the lower cutter 5 of the razor part, as a consequence of its displacement under the shaving pressure, comes to engage the abutment surfaces 29 of the intermediate member, and takes this with it. In this way, during the displacement of the intermedi ate member, the lower cutter 6 of the trimmers is disengaged from the upper cutters associated with it, so that the friction between the cutters of the trimmers is removed, or at least reduced.
  • FIG. 5 a construction is shown, similar to the constructional example according to FIGS. 1 and 2, in which the spring arrangements are made of different kinds of springs.
  • the springs 11 with an end engaging against the cutter head frame 1 are again coil springs.
  • springs 12 which engage against the lower cutter 5 of the razor part there are provided two blade springs extending in the longitudinal direction of the lower cutter 5, and lying on each side of the oscillating lever 20. These blade springs lie with their ends against the lower cutter 6 of the trimmer, while their central portion abuts against pins 30 provided on the lower cutter 5 for the razor part.
  • the intermediate member 22, forming the driving connection between the lower cutters 5, 6 here consists of a double spring plate, with a central opening 31 through which extends the oscillating lever 20, which operates the driving pin 18 of the lower cutter 5 of the razor part.
  • the intermediate member is arranged on the driving pin 18 by means of two lateral lugs 28 having longitudinal slits 28a, so that it again follows identically the movement of the lower cutter 5 for the razor part.
  • the lower cutter 6 of the trimmer is fixedly connected to the intermediate member 22, so that it is likewise driven via the latter.
  • the power transmission from the spring 12 to the lower cutter 5 occurs through a fork 32 inserted between the driving pin 18 and the spring.
  • the strength of the spring 11 is exactly chosen only so much greater than the strength of the spring 12, so that only during use of the razor part, by the additional shaving pressure which occurs, the force of the spring 12 somewhat exceeds that of the spring 11, so that the lower cutter 6 of the trimmer is displaced somewhat from the associated upper cutter.
  • the friction in the trimmer is sharply reduced, so that more power is available for the drive of the razor part.
  • the cutting surfaces of the upper and lower cutter lie completely against one another, and thus ensure a good cutting action.
  • a cutter head for a dry shaver comprising a cutter head frame, a perforated cutter foil arranged on the frame and acting as upper cutter for a razor part, a further cutter on at least one longitudinal side of the frame acting as upper cutter for at least one trimmer, lower cutters for the razor part and the trimmer, made as parts separate from one another, at least one spring arrangement, formed by two springs lying mechanically in series, of which one abuts :with one end on the cutter head frame, and the other abuts with one end on the lower cutter for the razor part, while the other ends of the two springs are in operating connection with the lower cutter for the trimmer, the strength of the springs which abut the frame, and press the lower cutter for the trimmer against the associated upper cutter being greater than the strength of the springs abutting against the lower cutter for the razor part, a driving connection between the two lower cutters, and means on only one of the lower cutters for direct engagement with a driving part of the shaver.
  • a cutter head according to claim 1, wherein the driving connection is an intermediate member, which on the one hand is connected to one of the two lower cutters pivotally, while being movable perpendicular to its reciprocating direction of motion, and on the other hand is connected fixedly to the other lower cutter.
  • a cutter head in which the lower cutter for the razor part has a driving bar, for engagement by a fork-shaped driving member of the dry shaver, and the intermediate member is arranged on the driving bar of the lower cutter of the razor part 'by means of two lugs having longitudinal slits, and the lower cutter for the trimmer is fixedly connected to the intermediate member.
  • a cutter head including two spring arrangements, wherein the intermediate member is formed as a second frame extending between the cutter head frame and the lower cutter for the razor part, while each of the two springs of each spring arrangement engages on a short side of the second frame.
  • a cutter head according to claim 4 wherein the intermediate member is guided in its longitudinal direction by its longitudinal frame sides on sliding surfaces of the cutter head frame.

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dry Shavers And Clippers (AREA)
US789859A 1968-01-12 1969-01-08 Cutter head for a dry shaver Expired - Lifetime US3553837A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT36568A AT276149B (de) 1968-01-12 1968-01-12 Scherkopf für Trockenrasierapparate

Publications (1)

Publication Number Publication Date
US3553837A true US3553837A (en) 1971-01-12

Family

ID=3488660

Family Applications (1)

Application Number Title Priority Date Filing Date
US789859A Expired - Lifetime US3553837A (en) 1968-01-12 1969-01-08 Cutter head for a dry shaver

Country Status (8)

Country Link
US (1) US3553837A (de)
AT (1) AT276149B (de)
CH (1) CH478639A (de)
DE (1) DE1901126A1 (de)
ES (1) ES362246A1 (de)
FR (1) FR1595440A (de)
GB (1) GB1198786A (de)
NL (1) NL6900410A (de)

Also Published As

Publication number Publication date
AT276149B (de) 1969-11-10
DE1901126A1 (de) 1969-07-31
FR1595440A (de) 1970-06-08
NL6900410A (de) 1969-07-15
CH478639A (de) 1969-09-30
GB1198786A (en) 1970-07-15
ES362246A1 (es) 1970-12-01

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