|Publication number||US2494463 A|
|Publication date||Jan 10, 1950|
|Filing date||May 3, 1946|
|Priority date||Mar 14, 1942|
|Publication number||US 2494463 A, US 2494463A, US-A-2494463, US2494463 A, US2494463A|
|Inventors||Leonardus Vivie Wilhelmus Lamb|
|Original Assignee||Hartford Nat Bank & Trust Co|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (2), Referenced by (4), Classifications (7)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Jan. 10, 1950 w. L. VlVlE 2,494,463
APERTURED CUTTING PLATE FOR DRY-SHAVING DEVICES Filed May 3, 1946 I, INVENTOR 'WLL. V/l//[ Patented Jan. 10, 1950 APERTURED CUTTING PLATE FOR DRY-SHAVING DEVICES Wilhelmus' Lambertus Leonardus Vivie, Eind hoven, Netherlands, assignor, by mesne assignments, to Hartford National Bank and Trust Company, Hartford, Conn., as trustee Application May 3, 1946, Serial No. 667,025 In the Netherlands March 14,' 1942 Section 1, Public Law 690, August 8, 1946 Patent expires March 14, 1962 ends.
Due to the skin-bulging effect of the reinforcement ribs the hairs thus erected to a greater degree and extending more outwardly are more readily conducted into the apertures of the cutting plate and are severed as short as possible by a the cutting member moving behind it, the reinforcement ribs also avoiding detrimental sag of the flexible cutting plate which by itself is very and constructed to be flat.
Indeed, sagging of the cutting plate which may be due to the pressure of the skin results in that the cutting member no longer sufficiently engages the contact surface of the cutting plate at all points and thus during shaving gives rise to the sensation as if the hairs were pulled.
Particularly if use is made of a rotary cutting plate sagging of the cutting plate may be due to the cutting plate being set vibrating, a kind of resonance phenomenon which apart from the said defect of unsatisfactory engagement of the cutting member may even result in that the material between the apertures of the cutting plate cracks and breaks ofi.
The invention also remedies this defect.
The invention is therefore particularly efficient in the case of cutting plates having slits formed in them, because the small dams located between the slits are more subject to the said kinds of sagging than the material of cutting plates in which for example circular or oval-shaped apertures are formed. In this case the bulging and reinforing ribs are preferably constituted by several small dams normally provided between the slits of identical width, if desired, but of larger thickness than the other small dams and the reinforcement ribs may be supported at both ends. By identical width of the dams reduction of the shaving surface due to the presence of the bulging and reinforcing ribs is avoided as far as possible.
If the invention is applied to a cutting plate for a dry-shaving device which comprises a cutting member and in which the cutting plate is provided with an annular contact surface for the said cutting member and a central story of rigid construction and also with slits extending radially 1 2 Claims. (Cl. 30-43) 2 to the outer edge of the cutting plate, the bulging and reinforcing ribs are supported, according to the invention, at one end by the central story and at the other by the outer wall of the cutting plate.
The thickness of the bulging and reinforcing ribs is preferably approximately from 0.2 to 0.8 mm. In order that the invention may be clearly understood and readily carried into effect it will now be described more fully with reference to the accompanying drawing, in which some few diagrammatically shown embodiments are illustrated.'
Fig. 1 shows a side elevation of a cutting plate according to my invention.
Figs. l-a shows a plan view of the cutting plate of Fig. 1.
Fig. l-b shows a cross-sectional view of the cutting plate of Fig. 1 together with an associated cutting member.
Fig. 2 shows a plan view of a cutting plate of rectangular shape according to my invention.
Fig. 2-11 shows a cross-sectional view of the cutting plate of Fig. 2.
Fig. 3 shows a plan view of an annular cutting plate with a central recess according to my invention.
Fig. 3-a is a cross-sectional view of the cutting plate and associated cutting member of Fig. 3.
Referring to the drawings, Fig. l-b shows a cutting plate 2 having formed in it circular apertures l jointly with a rotary cutter 3. According to the invention the outside to be applied to the skin is provided with one or more ribs 4 extending from the flat surface and tightly bulging the skin and also serving for reinforcement of the cutting plate as shown by Fig. l-a, said ribs being supported at at least one of the ends so that sufficiently rigid rib construction is ensured. In the example shown the reinforcementribs merge at 5 into the cylindrical outer wall 6 of the cutting plate 2.
The side elevation of Figure 1 lastly illustrates the skin-tightly bulging effect of the ribs. In the bends 8 the hairs are more expulsed outwardly from the skin pores by the tight bulging and in addition more erected so as to permit of their being captured more readily in the apertures. This therefore also results in an improved shaving effect. The reinforcement ribs in addition avoid harmful sagging of the cutting plate so that during shaving a more satisfactory engagement of the cutting edges of the cutting member is ensured throughout the length. This also results in quicker and shorter cutting of the hairs.
Referring to Figure 2 the invention is applied to a cutting plate of rectangular shape. For the sake of simplicity: identical members are (18818? nated by like reference numerals; Instead of circular apertures use is, however, made of long 5 slits 9 in the present case. The reinforcement, ribs are supported at both ends. As certain wellknown cuttin plates of this shape arezalwaysj provided with a reinforcement rib ID at each of the two ends of the cutting'pl'ataeven aasingler 10 centrally arranged bulging andireinforcingtrilr according to the inventionmay yield the-desired effect in those cases in which the length of the cutting plate is not excessive.
In the present case the width of .the' reinforce-.
ment ribs is equal to the width of the dams H provided between the slits with theresultthat loss of space is avoided as far as possible.
Finally, Figure 3 shows a cutting plate: ofthe:
type having a central re-entrant portion 12 of theirthickness may besmaller. From the viewpoint oftsymmetry less than two-bulging-ribsare not preferable in this case.
Generally, a thickness of the reinforcement ribs. ofapproximatelyfrom 0.2'to 0.8mm. suffices to bring about the desired efiect; the-spacingbetween theribs also playing'aepart in this case:
In the case of circular shaving plates as shown The. bulging and reinforcing. ribs 4 25 4 in Figures 1 and 3 it is preferable to cause the thickness to decrease according as the spacing between the bulging ribs decreases,,as is otherwise shown inthe figures;
What I claim is:
1. Dry shaving apparatus, comprising a substantiallyflat cutting plate with an enclosed cutting; member, said cutting plate being provided with an apertured running surface for said member.-and;comprising a plurality of sloping ribbed portions extending: from the shaving surface thereoijsaid ribbed portions being integral with said cutting plate and so extending beyond the shaving surfaceof the said cutting plate to bulge the skin to'beshaved.
2. Dry shaving apparatus, comprising an annular cup-shaped cutting plate and a cutting member, said cutting plate being provided with a central recess, havin an annular apertured running surface and being provided with a plurality oi.- sloped. ridge portions radially. extending-.from the. said. central recess from' the shaving surface ofsaid. cutting plate,- said. ribbed portions being integral with said, cutting plate and .sdextending beyond thev shaving surface-of the said.cutting plate toiflex the skin to be shaved.
WILHELMUS LAMBERTUS LEONARDUE.
REFERENCES CIT-ED Theiollowing referencesfare of record. in.tlie file cf= this patent:
UNITED STATES PATENTS
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US2281789 *||Dec 1, 1939||May 5, 1942||Shaving apparatus|
|US2283834 *||Nov 7, 1939||May 19, 1942||Hartford Nat Bank & Trust Co||Hair-cutting device|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US3292251 *||Jul 8, 1964||Dec 20, 1966||North American Phillips Compan||Slotted shear plate for electric shavers|
|US6868611 *||Dec 3, 2001||Mar 22, 2005||Koninklijke Philips Electronics N.V.||Shaving apparatus|
|US8307740 *||Oct 28, 2005||Nov 13, 2012||Koninklijke Philips Electronics N.V.||Cutter unit for a rotary shaver, method for making such a unit and rotary shaver provided therewith|
|US20090019703 *||Oct 28, 2005||Jan 22, 2009||Koninklijke Philips Electronics N.V.||Cutter unit for a rotary shaver, method for making such a unit and rotary shaver provided therewith|
|U.S. Classification||30/34.2, 30/346.51, 30/43.6|
|International Classification||B26B19/42, B26B19/38|