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Publication numberUS3905099 A
Publication typeGrant
Publication dateSep 16, 1975
Filing dateMar 4, 1974
Priority dateMar 2, 1973
Also published asDE2410213A1
Publication numberUS 3905099 A, US 3905099A, US-A-3905099, US3905099 A, US3905099A
InventorsBernstrom Elon C
Original AssigneeBernstrom Elon C
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electrical razor
US 3905099 A
An improved electrical razor is disclosed having two separate but to some extent cooperating ventilation systems for cooling the electrical drive means and associated transmission means and for removing loose bristles from the cutting portion of the razor.
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Description  (OCR text may contain errors)

United States Patent Bernstriim Sept. 16, 1975 [5 ELECTRICAL RAZOR 2,518,181 8 1950 Rennie 30/416 1 2,950,530 8/1960 Fox 30/415 [761 lnvenmr Bemstmm 3,396,462 8 1968 Dufresne... 30 415 Karlbergsvagen, 5-113 35 3,494,031 2/1970 Sklenar 30/43.6 Stockholm, Sweden 22 Filed; 4, 1974 Primary ExaminerAl Lawrence Smith Assistant Examiner-Gary L. Smith [211 Appl' 447343 Attorney, Agent, or Firm-Cushman, Darby & [30] Foreign Application Priority Data Cushman Mar. 2, Sweden U.S. An improved electrical razor is disclosed having two Int. Cl. eparate but to some extent cooperating ventilation [58] i l Of Search systems for cooling the electrical drive means and associated transmission means and for removing loose bristles from the cutting portion of the razor. [56] References Cited UNITED STATES PATENTS 5 2 Draw F'gures 2,253,016 8/1941 Collins 1. 30/43.6 2,267,626 [2/1941 Stainbrook 30/4l.5


1 ELECTRICAL RAZOR The present invention relates to a razor with an electrical drive means which drive a cutting arrangement comprising an apertured cutting blade, adjacent one,

side ofwhich there is provided a movable means having.

v 8 the bag 14 for collecting loose bristles is disposed the efficiency of the razor. This can be prevented by 7 daily cleaning of the razor, but convenience and rush makes us neglect of this sort of occupation. One has suggested razors equipped with simple fans in order to remove the loose bristles. Up to now, the suggestedimprovements have not been put on the market. which might depend on the fact that those constructions have not fulfilled the demands called for. The razor of the,

present invention, however, has the advantages considering the easy handling, long aimed for.

This has been achieved by the use of two essentially separate but in some respects cooperating ventilation systems, which in combination with a simple inexpensive and expedient construction also has resulted in an easy to handle silent running and efficient razor. The use of two systems results in shorter air flux paths and thereby the effects of the air fluxes are stronger than by using a single system. Cooperation between the two systems also gives a special effect, as more fully described below. The invention is defined in the appended claims.

A favourable embodiment of the invention is described below with reference to the drawings showing a razor in crosssection.

FIG. 1 is a front view of the embodiment in section;


FIG. 2 is a side view in section.

which bag is removable through the lid 15. In this second system, air is sucked inwards through the apertures of the cutting blade and passes the movable cutting means 3 and through a longitudinal slot 21 arranged in an intermediate bottom 30 into the defined cavity 8 with the collecting bag 14. The bag is designed to let air through to the turbine drum but keeps the loose bristles which can be removedwhen necessary.

The movable cutting means 3 in the example described above has one with shaft journals 9 and provides rotating a drum of cylindrical shape with a number of cutting edges 10 arranged along the envelope surface essentially in the longitudinal direction of the drum. Owing to this the ventilation of the cutting means isfacilitated and amplified because the rotating drum with its cutting edges 10 serves as a fan. Of course, on condition that the direction of rotation is correctly choosen. The two systems cooperate on the way between the rotating drum and the collecting bag, on which way the two air fluxes from both systems are joined. After passing the aperture 13 in the intermediatewall 12 the first systems air flux is deflected mainly along the cutting edges 10 and this contributes to keep them clean, particularly as the air in this flux is a bit warmed and owing to this results in a certain drying of the loose bristles moistened by the skins secretions. The sucking away of loose bristles is done with great efficency.

The electric motor 1 and the cavity with the collecting bag 14 are arranged together with a connecting In FIG. 1 the movable cutting means and also the cutting blade are partly indicated.

The cutting means of the razor are driven by an electric motor 1 through a movement transmission means 2 in form of a silent running worm gear, connected to the movable cutting means 3. At a distance from the end of the motor shaft 4 a propeller fan is disposed, which through an opening in the housing of the apparatus sucks in and blows air past the electric motor 1 and the movement transmission means 2. This and the movable cutting means 3 are placed near each other with an intermediate wall 12 between, in which there is provided an aperture 13 through which the air coming from the fan 5 passes towards the cutting means. The fan 5 is part of a first ventilation system the purpose of which is to cool the electric motor and the movement transmission means 1, 2 for the movable cutting means 3, but also contributes to pass the loose bristles down into a collecting bag arranged in the razor.

A second ventilation system includes a blower 6 enclosed in a turbine drum which has an air exhaust aperture 35 on the razors housing an an aperture 16 provided with a net or a grate 17 towards razor defined sealed cavity 8. By the suction effect of the turbine in this aperture 16 a pressure below the atmospheric is established in the cavity 8. This is accessible from outside through a lid 15 in the apparatus housing. In the cavity socket 18 for connection to the voltage source and together with a voltage selection switch 20 in a part of the razor which through the intermediate bottom 30 is separated from the moving transmission means and the cutting means. In the intermediate bottom 30 apertures for the required air fluxes are made, whereby the first aperture consists of the slots 21 arranged under the cylindrical drums whole length and provided with a flange 22, around which the collecting bag 14 is fixed with the help of a rubber band 23.

The razor of the invention can, just as similar apparatuses be provided with a so-called trim cutter 24, the movable portion of which is driven by action of a waveshaped cam 25 on the worm-wheel 26 abutting pin 27 with a small spring pressure being applied to the end of cutter 24 remote from pin 27 to bias the cutter in the retracted position. The pin can be removed if the trim cutter is not used, whereby the load on the motor is reduced.

The cutting edge provided with slots or apertures is arranged in an opening in a removable housing 28.

Through pushing a latch one is able to take off the housing and reach the cutting means 3 disposed under the cutting blade 7, which with shaft journals is supported in a frame 11. An extraordinary advantage is that the cutting means can be picked up and turned about to make it possible to utilize both sides of the cutting edges and by that double the life and of course to exchange the cutting means for a new one.

Within the scope of the claims various modifications of the embodiment described above are possible.

The movable cutting means can be provided with longitudinal cutting edges of different shapes and they can be arranged on a number of parallel rings connected with each other and designed and arranged to make the cutting edges move along a cylindrical surface when rotating. This arrangement of all different details can also be modified without leaving the inventive idea.

I claim:

1. A razor device including an electrical drive motor, which through a transmission drives a cutting arrangement comprising an apertured cutting blade, adjacent one innerside of which there is provided a movable cutting means having cutting edges, there being provided means defining a closed cavity having an outlet opening and an inlet opening, said cutting arrangement being adjacent to said inlet opening, around which there is provided an air-permeable hair collecting bag in the cavity, a first and a second fan means being arranged on and driven by a shaft of said motor, said first fan means producing a first axial air stream over the motor and the transmission to the cutting arrangement, said second fan means being a radial turbine blower, having an inlet opening which is connected to said cavity outlet opening, said second fan means producing by suction a second air stream from said cutting arrangement through the cavity inlet opening, which second air stream comprises the air of said first air stream and air which is sucked through the apertures of the cutting blade.

2. A razor device according to claim 1, wherein the movable cutting means comprises a rotary cylindrical drum having shaft journals and a number of cutting edges arranged along the envelope surface essentially in the longitudinal direction of the drum, whereby the air flows are facilitated.

3. A razor device according to claim 2, wherein said cutting means has its shaft journals supported in a U- shaped frame, from which it can be picked up and turned about, whereby both sides of the cutting edges may be utilized, and whereby said cutting means is easily replaceable.

4. A razor device according to claim 1, wherein said transmission and said movable cutting means are disposed in defined adjacent spaces, between which an intermediate wall is provided, said wall having an aperture.

5. A razor device according to claim 1, wherein a grate or net is disposed in the cavity outlet opening in said cavity defining means.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2253016 *May 18, 1938Aug 19, 1941Knapp Monarch CoRotary shearing head
US2267626 *Aug 14, 1939Dec 23, 1941Lee Stainbrook HubertElectric dry shaver
US2518181 *Oct 7, 1946Aug 8, 1950William C RenneSafety razor
US2950530 *Dec 2, 1957Aug 30, 1960Fox Donald LElectric shaver with vacuum collector
US3396462 *Jun 9, 1967Aug 13, 1968Edmund A. DufresneElectric razor cleaning system
US3494031 *Feb 1, 1968Feb 10, 1970Sklenar Wenceslas FElectric shaver
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5933961 *Apr 30, 1998Aug 10, 1999Oakey; Warwick L.Electric shaver with vacuum
US7490408 *Dec 15, 2006Feb 17, 2009Braun GmbhElectric shaving apparatus
US7721451 *Jul 22, 2004May 25, 2010Bic-Violex S.A.Razor equipped with several rotating shaving heads
U.S. Classification30/41.5, 30/34.1
International ClassificationB26B19/38, B26B19/44
Cooperative ClassificationB26B19/44
European ClassificationB26B19/44