US2741839A

US2741839A - Safety razors

Info

Publication number: US2741839A
Application number: US297237A
Authority: US
Inventors: Hulverscheidt Hellmuth
Original assignee: Individual
Current assignee: Individual
Priority date: 1951-07-17
Filing date: 1952-07-05
Publication date: 1956-04-17
Anticipated expiration: 1973-04-17

Description

APril 17, 1956 H. HULVERSCHEIDT 2,741,839

SAFETY RAZORS Filed July 5, 1952 United States Patent F SAFETY RAZORS Hellmuth Hulverscheidt, Dusseldorf, Germany Application July 5, 1952, Serial No. 297,237

2 Claims. (Cl. 30-50) This invention relates to a safety razor, for example of the kind using wafer blades, and the object of the invention is to provide an improved safety razor with which a quicker shave can be obtained.

In the case of a stiff heard, to obtain a smooth shave it is necessary to pass the razor several times over the place to be shaved with or against the grain. This increases the time required for shaving. Further, a disadvantage of many safety razors is that the razor blade must be changed after a relatively short time. This is especially the case with safety razors having rustless blades, with which it is unnecessary to take the razor to pieces after each shave for cleaning purposes.

According to the invention, a number of razor blades are disposed one above another in spaced arrangement with their cutting edges lying in the lines forming the sides of the cutting angle. By this means the result is obtained that, on passing the razor once over the place to be shaved, several blades come into action one after another, so that a perfect shave is obtained after a single passage of the razor which represents a considerable saving in time. The method of operation is that, on shaving, the foremost cutting edge effects a preliminary shave and the following cutting edges almost simultaneously effect the final shaving. A further advantage is that the individual edges are subject to less wear at eachpshaving operation, so that a change of blades need not be made as frequently as was hitherto necessary.

For the invention it is immaterial how many blades are arranged one above another. Usually three superimposed blades will be provided. Also the kind of blade is not of primary importance for the invention, although wafer blades are preferred. The invention can, of course, also be used with safety razors using blades which are similar to those of ordinary non-safety razors. Also the invention is not limited to safety razors of the kind in which the blades are mounted on pins or bars and are fixed by means of a cover plate which is made tight by screwing. On the contrary, the invention can be used equally well with safety razors with a hinged retaining device for the blades.

When wafer blades of the same size are used, suitable intermediate layers are arranged, in accordance with the invention, between the blades, these layers being of greater transverse curvature on the upper side than on the underside for ensuring that the cutting edges lie in the lines enclosing the cutting angle, the transverse curvature of the under side of the cover plate conforming to that of the intermediate layer below the uppermost blade. If the safety razor is provided with a hinged retaining member, the intermediate layers also may be hinged to the razor.

Also, in accordance with the invention, the cutting angle of the blades is the same for all the blades. For this purpose, in the case of safety razors using wafer blades, the intermediate layers may be provided near their edges with a recess or indentation on their upper side which corresponds to an outward bulge or protuberance on the under side of the next intermediate layer.

If the invention is to be applied to an existing safety razor using wafer blades, there may be arranged between the underside of the cover plate and the uppermost blade a suitable intermediate layer the underside of which is transversely curved to conform to the transverse curvature of the uppermost blade and the upper side of which is transversely curved to conform to the transverse curvature of the underside of the cover plate. Since the blades themselves are extremely thin and the distance between their cutting edges need be only very small, almost any existing safety razor can be used in carrying out the present invention.

In order that the invention may be easily understood and readily carried into effect, a safety razor in accordance with the invention is illustrated, by way of example, in the accompanying drawing in which:

Figure 1 is a perspective view of the upper part of the safety razor,

Figure 2 is a side elevation of the safety razor shown in Figure l, and

Figure 3 shows the right-hand half of Figure 2 on a larger scale.

Referring to the drawing, the safety razor which is illustrated by way of example is intended for use with the three-hole blades which are mounted on three pins 1 on a cover plate 2 which is drawn against the comb plate or guard 3 by screwing the handle 4 on to the screwthreaded centre pin of the cover plate.

The safety razor is provided with three blades 5. The cutting edges of the blades are disposed in the boundary lines or sides 6 of the cutting angle 7. Between the blades are provided intermediate layers or spacing pieces 8 the transverse curvature of which is different on the underside from the transverse curvature on the upper side. The curvature of the upper side is greater than the curvature of the underside, so that the chord of the arc of the blade lying on the upper side of an intermediate layer is shorter than that of the blade disposed on the underside of the same intermediate layer, with the result that the cutting edges of the blades lie on the lines 6.

In the constructional example illustrated, the curvature of the underside of the cover plate conforms to the curvature of the upper intermediate layer. Instead of this, for existing safety razors, a further intermediate layer can be arranged between the cover plate and the upper blade.

As shown in Figure 3 the intermediate layers have on their upper side an inwardly curved portion 9 which corresponds to an outwardly curved portion 10 of the underside of the next intermediate layer. In the constructional example illustrated an outwardly curved portion 10 is provided on the underside of the cover plate. By this means all the blades are given the same cutting angle.

I claim:

1. A saftey razor comprising a cover plate and a guard plate, said plate being provided with transversely curved blade engaging surfaces, a plurality of blades having identical length and width disposed one above the other between said plates, spacing members provided between said blades for separating said blades a predetermined distance, said spacing members being provided with transversely curved blade engaging surfaces which increase in curvature from said guard plate toward said cover plate decreasing the distance between the opposite exposed edges of individual blades progressively from said guard plate, said blade engaging surfaces of said cover plate and said spacing members except the surface engaging said blade immediately adjacent said guard plate being provided with reverse curves so that the cutting angle of each blade is the same irrespective of the increasing amnesia curvature of the surfaces of'said spacing members from engaging surfaces of said cover plate and said spacing said naw'pme'mwarcrsaidwover'plater" V member-sexua the" surface engagingthe"blade"" V 2. A safety razor comprising a cover plate and a mediately adjacent said guard plate being provided with guard piate, said plates being provided with transversely reverse curves adjacent the cutting edges of said blades so 7 curved was engaging sunfaces,"a pliiralityet was; 5 that the cutting angle of each blade is the same. having identical length and'width dispbsedion'e' above-die V O'th'f between 'p SP 1x19111551? 'Rfdvidd References Cited in the file of this patent betweensaidibladesfor separating: saidbla'des a'p'redet'er-' mined distance; said sjpacing'i member's being fprdvided UNITED STATES PATENTS with transversely curve'd'blade 'erigagin'g'jsu'rface's which. 10 1,024,509 Harrison Apr. 30, 1912 increase" in' curvature from sa'id gnard'pm'te toward said c'over' plate"tiierebydecreasing 'thedistance between the FOREIGN PATENTS oppositeexgosededgesofindividualblades progi essiveiy 634,488 France Nov. 19; 1927 ficinr'said guardfplate"teward'saidcoverpiate; said'bla'de' 821,030 France Aug. 17, 1937