US2305770A - Dry shaver - Google Patents

Dry shaver Download PDF

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Publication number
US2305770A
US2305770A US292479A US29247939A US2305770A US 2305770 A US2305770 A US 2305770A US 292479 A US292479 A US 292479A US 29247939 A US29247939 A US 29247939A US 2305770 A US2305770 A US 2305770A
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US
United States
Prior art keywords
blade
casing
cutting edge
shaver
slot
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
US292479A
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English (en)
Inventor
Grivetto Michele
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Individual
Original Assignee
Individual
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Filing date
Publication date
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Application granted granted Critical
Publication of US2305770A publication Critical patent/US2305770A/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
    • B26B19/12—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

  • An object of this invention is to provide a dry shaveriof the above-mentioned type, in which the stationary blade isv constituted by one side of a longitudinal substantially continuous slot in the cylindrical casing, which is further provided with a bearingA surface for the skin, the plane of said surface being substantially tangential to the arcA of circle describedY by the cutting edge of the movable blade and normal to the plane passing through the axis of oscillation of the movable blade and .the cutting edge of the stationary blade. With this arrangement the hair is cutiat its root, that is, quite near to the skin, without hurting the latter.
  • a further object of the invention is to provide a dry shaver of the above-mentioned type,Y in
  • Another object of the invention is to provide in a dry shaver of theabove-mentioned type narrow bridges arranged transversely to the slot and connecting the cutting edge of the stationary blade to the portion of the bearing plane opposite to said cutting edge.
  • These bridges are adapted to stiffen the stationary blade and obtain a continuous bearing plane for the skin; they moreover show the advantage that the hair. is not bent between the bearing plane and the skin and is prevented from being brought between said parts, thus holding the cutting edge of the stationary blade at a distance from theskin; the hair is thus cut at its root.
  • Figure 1 is a longitudinal. section of head
  • Fig. 2 is a section on line II-Il of Fig. l;
  • Fig. 3 is a section on line YIII-III oi' Fig. l;
  • Fig. 4 is a partial section on line IV--IV of Fis. 2:
  • Fig. 5 is a front view of the movable blade
  • Fig. 5a is a sectional view thereof
  • lFig. 6 is a partial cross section of the shaver head showing a modified form
  • Fig. 7 is a side partial view of Fig. 6 seen in the direction of the arrow VII;
  • the shaver Fig.l 8 is a view similar to Fig. 6 of a further modied construction
  • Fig. 9 is a partial side view ⁇ of Fig. 8 seen in the direction' of the arrow 1X.
  • l denotes the semicylindrical casing receiving the movable blade 2
  • the cylindrical wall of the casing I is a milled cut t which extends over the whole length of the casing, except the regions in nearest proximity to its end portions.
  • the bottom of the milled cut 3 forms a bearing surface 4 for the skin, on which the shaver is moved to and fro.
  • the bearing surface 4 is discontinuous owing to theslot i which forms the cutting edge 5 for the stationary blade.
  • This cutting edge 5 is situated at the end of the radius 6 which is normal to the bearing surface 4.
  • the stationary blade is necessarily of-a certain thickness, its edge is tapered, in order to bring the cutting edge 5 as near as possibley the cutting edge of the movable blade oscillating underneath the former.
  • the blade 2 is provided on the axis of oscillation 0 with two semlcylindrical surfaces i I, seated in correspondingly shaped recesses in two pins ill. 'I'he latter are subjected-to the action of springs i3, that push the free blade end against the edges la oi the casing I, insuring a perfect articulation with a minimum friction for the blade oscillations.
  • the pins ill and springs i3 are eccentrically mounted in cylinders i2, rotatable in seatings formed in a supporting base I9 xedly connected with the casing I.
  • the cylinders i2 are formed with lower grooves i2a which permit angular displacements of the cylinders i2, thereby transversely displacing the pins i0, in order to adjust the support of the blade 2.
  • the cylinders i2 are locked in their adjusted position by means of set screws it.
  • the blade 2 is formed at its lower -end with a central projection I 5, having a slot IB receiving an eccentric pin il on va shaft i8.
  • the shaft i@ is rotated by a'motor (not shown) suitably incorporated in the shaver, imparting to the blade 2 very rapid oscillatory movements.
  • the width of said oscillations is such that the cutting edge of the movable blade2i does not move over the whole width of the slot 1, but only over a part thereof. ln fact, the position of the blade 2, shown in Figure 2, approximately corresponds to the final blade position.
  • the object of this arrangement is to facilitate admission of longer hair into the slot i and to set it upright for cutting.
  • the grooves t ( Figure 4) formed in the portion o the bearing surface opposite the cutting edge 5, exert a combing action on the longer hair, assisting in setting it upright in the proper direction as it enters the slot 'l'.
  • the width of said oscillations is such that the cutting edge of the movable blade2i does not move over the whole width of the slot 1, but only over a part thereof. ln fact, the position of the blade 2, shown in Figure 2, approximately corresponds to the final blade position.
  • the object of this arrangement is to facilitate admission of longer hair into the slot i and to set it upright for cutting.
  • blade 2 may also be provided with grooves 8 ( Figure 5) which are, however, inclined in order to secure continuousness of the blade cut.
  • the general construction corresponds to that shown in the formerly described construction, and details need not be repeated.
  • the bearing surface @i for the skin still is normal to the radius 6 passing through the edge of the stationary blade 5.
  • the modification concerns only the portion l of the casing opposite the stationary blade. This portion is formed with cuts 20 instead of simply with grooves as provided in the constructions shown in Figs. 1 to 5, and extends towards the stationary blade so that the width i the slot 2
  • the width of the extreme angular displacements of the oscillating blade 2 at its edge is greater and extends beyond the slot portions 2
  • Figure 6 shows by way of example in dotted and full lines, respectively, the two final positions of the oscillating blade 2. It will be obvious that, in order to reach the position shown in full lines, ⁇ the oscillating blade moves over a certain length of the zone of the member I formed with cuts 2l
  • the support i9 for the outer casing and cylinders l2 may be moulded from a plastic composition, for instance of the type known under the registered name of Bakelite, which makes construction less expensive.
  • the semicylindrical chamber in which the blade 2 oscillates is closed towards this mechanism by a plate 22 having only holes for the passage of the tail I actuating the blade 2 and pins IQ supporting said blade.
  • the portion 23 of the bearing surface for the skin, 'opposite'to the cutting edge 2s of the stationary blade, is connected to the remaining part 25 of said bearing surface by means of a set of narrow bridges 2t formed by providing in the portion ib of the casing deep cuts 2l perpendicularly to the stationary blade.
  • the width of said bridges is about 3/10 mm., while the cross cuts may be, for instance, of "/w-n/io mm. width.
  • the cutting edge of the blade is tapered, as shown in the drawing, with a large development of the tapered surface.
  • This taper is economically formed by the same milling cutter used to form the cuts 2i'.
  • the milling cutter is shown in dotted lines in Figure 8, where it is denoted by the letter F.
  • the cuts 2 subdivide the hair. bringing it on the stationary blade, where they are cut by the movable blade, as stated above.
  • a dry shaver comprising a semi-cylindrical casing, a blade mounted for oscillation in said cylindrical casing about the axis of the latter and having a tutting edge movable substantially along an arc of the inner cylindrical surface of said casing, the outer portion of the senil-cylinder being cut away between the ends thereof along a plane extending substantially tangentially to the inner cylindrical surface thereof to provide a cutting .edge at the ⁇ intersection of said plane and the inner cylindrical surface, said semi-cylinder being further out away to provide a slot having the cutting edge as one of its edges, and means for imparting to said oscillating blade an oscillatory motion extending over a part only of the slot width.
  • a dry shaver comprising a semi-cylindrical casing, and a blade mounted for oscillation in said cylindrical casing about the axis of the latter and having a cutting edge movable substantially along an arc of the inner cylindrical surface of said casing, the outer portion of the semi-cylinder being cut away between the ends thereof along a plane extending substantially tangentially to the inner cylindrical surface thereof at a. plurality of regions to provide a cutting edge at the intersection of said plane and the inner cylindrical surface, said semicylinder being further cut away to provide a plurality of slots extending from the cutting edge to receive hairs to be cut.
  • a dry shaver comprising a cylindrical casing, a blade in said casing mounted for oscillation about the axis of the latter, and a spring support in said casing for said blade tending to bring the cutting edge of said blade into engagement with the inner cylindrical surface of said casing, the outer portion of the semi-cylinder being cut away between the ends thereof along a plane extending substantially tangentially to the inner cylindrical surface thereof at a plurality of regions to provide a cutting edge at the intersection of said plane and the inner cylindrical surface, said semi-cylinder being further cut away to provide a plurality of slots extending from the cutting edge to receive hairs to be cut.
  • a dry shaver comprising a cylindrical casing, a blade in said casing mounted for oscillation about the axis of the latter, a spring support in said casing for said blade tending to bring the cutting edge of said blade into engagement with the inner cylindrical surface of said casing, the outer portion of the semi-'cylinder being cut away between the ends thereof along a plane extending substantially tangentially to the inner cylindrical surface thereof at a plurality of regions to provide a cutting edge at the intersection of said plane and the inner cylindrical surface, said semi-cylinder being further cut away to provide a plurality of slots extending from the cutting edge to receive hairs to be cut, and means for swinging the cutting edge of the movable blade to a distance not less than -35 millimeters from the stationary cutting edge.
  • a dry shaver comprising a cylindrical casing having a longitudinal slot, one side of which constitutes the cutting stationary edge, a bearing plane for the skin formed on the outer face of said casing being substantially tangential to the cylindrical inner surface of said casing along a hne coinciding with the cutting edge of said 1' simian@ and the zlirestsn of me@ CLI through he axis o blade and the staonsry c i6.
  • A. dry shaver comprising a cylindrical ses having a longitudinal slot, ons which @uiting edge of n of the beaing blade 'seing mts bram/'een b'ldges and a @cada mounted t@ u fs in said having its cutting "fige, a. heal ma outer face y tangential te :am casing along -1 @www edge a lade moimtec, to having its cutting ed gemelli; with said smb e spring;
  • a dry 'shaver comprising a cylimlcal cas ing having e. narrow dscontnucauslnnglibudnal slot, one side of which constitulzes me smtonary blade, s plurality nf marras.' '.arfges tzm said slot, a bearing plane for the @sin imma@ an the eater face of said casing being subst sly tangential m the inner: cylmisal sm' @l said casing along a line coimlrsg with :21trtng edge of said stationary mafie, She ai? sg, El mzstmg edge wilma!

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dry Shavers And Clippers (AREA)
US292479A 1938-09-03 1939-08-29 Dry shaver Expired - Lifetime US2305770A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT212691X 1938-09-03
IT51038X 1938-10-05
IT290539X 1939-05-29

Publications (1)

Publication Number Publication Date
US2305770A true US2305770A (en) 1942-12-22

Family

ID=27272633

Family Applications (1)

Application Number Title Priority Date Filing Date
US292479A Expired - Lifetime US2305770A (en) 1938-09-03 1939-08-29 Dry shaver

Country Status (5)

Country Link
US (1) US2305770A (enrdf_load_stackoverflow)
BE (1) BE436250A (enrdf_load_stackoverflow)
CH (1) CH212691A (enrdf_load_stackoverflow)
DE (1) DE716998C (enrdf_load_stackoverflow)
FR (1) FR859429A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3413719A (en) * 1965-05-31 1968-12-03 Moser Kuno Electric razor with adjustable cutter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2676453A (en) * 1950-07-13 1954-04-27 United Metal Goods Mfg Co Inc Pendulum swing for electric clocks

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3413719A (en) * 1965-05-31 1968-12-03 Moser Kuno Electric razor with adjustable cutter

Also Published As

Publication number Publication date
FR859429A (fr) 1940-12-18
CH212691A (fr) 1940-12-15
BE436250A (enrdf_load_stackoverflow)
DE716998C (de) 1942-02-03

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