US1872721A - Safety razor blade and razor - Google Patents

Description

. F. FORD Aug 23 '1932' SAFETY RAZOR BLADE AND RAZOR 1872 Filea July 8, 1931 Patented AAug, 23, 1932 UNiTE-D STATES maar .FRANK roan, or camorra, BRITISH: INDIA SAFETY nazca :BLADE am) -aAzoa Application ill-ed July 8,` 1931. Serial VNo.' 549,484. A v

vided suiicient length of rest periodbetween It is well known that razors give better service if the blade after being used is given a. rest. Such a rest should'exceed one day in length, andbetter service is forth-coming 5 it the edge'has three, four or morel days rest between each use.

lt is known' that safety razor bla 'es with more than 2 cutting edges, such as the blades now generally in use are provided with, have j 1o been proposed for the purpose to allow the use of alternate edges of the blade on alternate days and thus allow the previously used ed es to rest for shorter'or longerv periods beg-ore they are again used. lt is also known 15 to provide the various edges of such polygonal blades with indices to designate which edges of the blade have been used and dulled. Such blades, however, have not come into general use for the reason that it is diiiicult for 2e the user to remember the indicia designating the edge last used and as a rule a person would not take the trouble to make arecord of or note down the edge last used so as tol Besides, the various kinds of polygonalY blades heretofore proposed for this purpose do not have a suicient number of alternately usable edges to provide for a suicient restV 3Q period Jor each edge to recover beforev it isV K to be used again. Y Y A rllhe main object of this .invention is to provide a polygonal razor blade of the wafer 5 type which carries indicia designating the successivedays of the month so that the user,

in order to determine which edge to use on any particular date, may only have to know what particular day of the month itis and a not need to remember otherwise which of the edges of the blade has previously -been used.

Another object of this invention i's to provide such a blade witha sufficient number of edges and with such a method of lacing 45 with indicia thereon that there will e prosuccessive uses of the same edge.

A still further object of the invention is to provide suitable means in such blades, in conjunction vwith suitably constructed ,holders to properly distribute the stresses arising 1n theblade from the necessaryy clamping action,

so .as to stiien the working edge in a satis- Y factory' manner.

An object of this invention is also to pro- 55 videa holder for such blades as above described inwhich ordinary 2 edged blades such as are now in common use may be used inV an emergency, i. e. when the special blades forming'the subject of this invention are not available. y

With these and other objects in view which will hereinafter appear, the invention consists in a razor blade with multiple cutting edges provided with indiciadesignating the successive days of the month and a suitable holder for the same. Y

lin. carrying out this invention, a razor blade o" the wafer typevwith at least 3, but preferably more, cuttlng edges is provided, having numbers applied to these cutting edges in various sequences, such numbers be- V'ing identical with the number of days in a month, preferably' from l to 31,-but it is understood that they may run from say i tf l5, 16 vto 3l or any other sub-division of a month, as will hereinafter be further de'- scribed.

. With the ordinary wafer blade the surface of the holder to which the blade is clamped is cambered so that when clamped in position the blade is denied. lhis dering gives the blade as a whole an arched form, and such form` no doubt stife'ns up to cutting edge to a certain extent. When however the wafer used with a multiplicity of cutting edges, as ,is contemplated according to this invent-lon,

the dome-like deformation of the wafer blade A need not be any-thing like as pronounced as thedeformation given to the arch form of the usual two edged blades. Owing however to the fact that for some purposes a considerable deformation is or may be thought to be desirableQthi's, according to the present invention, may be realized without excessively stressing the metal of the blade by splitting the corners or dividing the metal of the blade at each corner for a. considerable depth extending towards the centre of the blade, so that the individual facets or cutting edges of theblades, or the pairs of facets opposite each other (where the number of facets is even), will act more as if stressed by being subjected to the simple bending iiexure as of the ordinary type of blade in the said direction ratherthan being stressed as if subjected to the dome-like lexure above referred to of the blade with mu'ltiple cutting edges.

According to the present invention the iexture of the blade may be partially arch-like and partially dome-like depending upon the depth to which the corners of the blade are divided. Whether the one orthe other of these stress conditions predominates will de- Asu . While pend on the particular form iven. It will however be realized that the t ickness of the wafer blade at or adjacent'to the centre of the blade may be increased with certain advantages which may be obtained by the use of a blade which, Whilst still classed as a wafer blade, 1s thickened up towardsthe ccentre. TheV splitting of the corners or the deep recessing of` thecorners of the multiple-edge blade thus enables a thicker blade to be used.

The holder which I provide for these blades, preferably has a convex or dome-like surface. to which the blade is clamped by the guardor cover part and in which apertures or notches are provided through which the date numbers may be seen.

The razor blades according to this invention preferably have the corners between `their contiguous sides removed and notches formed in these corners in order to4 give the cutting edges greater iexibility when bent eing clamped in the holder.

When the said razor blade is triangular in shape the date numbers 1, 4, 7, 10, 13, 16, 19, 22, 25and 28 may be spaced on one or on both sides of one edge, the numbers 2, 5, 8, 11, 14, 17, 20, 23, 26 and 29 spaced on one or both sides of another edge, and the numbers corners of the blades may be cut through ,to the posltioning holes and continued at t 3 6, 9, 12, 15, 18, 21, 24, 27 and 30 0n the last e e.

In this case in order to avoid a multiplicity of numbers on each edge the numbers may be divided and part placed on one side of the blade and the rest on the other side. For example a triangular blade mayv have the dates 1, 7, 13, 19 and 2,5 on one side of one edge and 4, 10, 16, 22 and 28 on the other side of the same edge, the second edge having 2, 8, 14, and 26 on the first side and 5, 11, 17, 23 and 29 on the other side, whilst the last edge has 3, 9, 15, 21 and 27 on the first side and 6, 12, 18, 24 and 30 on the other side.

Where the blade is one having four sharpened edges-the dates 1, 5, 9, 13, 17, 21, 25 and 29 maybe placed on one cutting edge and the vother dates 2, 6, 10, etc. 3, 7, 11, etc. and 4, 8, 12, etc. on the other three cutting edges.

In this case again alternate date numbers on each edge may be divided, half being on one side of the blade and the other half on the other side of the blade.

, Where the razor blade has six cutting edges the dates 1, 7, 13, 19 and 25 ma be onone edge, 2, 8, 14, etc. on the next e ge, 3, 9, 15, etc. on the next edge, and so on.

Where the razor blade has eight cutting edges it may have the dates 1, 9, 17 and 25 on one edge, 2, 10, 18 and 26 on the next edge, and so on. e

If preferred the alternate dates on any particular edge may be divided, one half being on one side of the blade along said edge, the other half being on the other side of the blade. l

Where the number dates marked on a razor blade edge are divided, some of the dates being on one side of the blade and others on the other side, the dates on the one side may be arranged to read asa series in a clockwise manner, and those on the other side, the alternate-dates thereto, as a series in the anticlockwise manner. v Y

The razor blades according to this invention have a number of positioning holes provided therein, corresponding to the number of their cutting edges, and a center hole for the passage therethrough 'of the stem of the holder. The holder is provided with a corresponding number of studs for engaging the positioning holes. The notches in the e diametrically opposite side of the holes to near the center of the blade for the purpose of greater 'liexbility of the blade and its adaptability to the shape to which it is deformed .when clamped in the holder.

In the modification wherein the blade'has four cutting edges the invention includesthe combination bf a holder with a blade with four positioning holes punched through the blade, the sizeof the holder and of its normal blade and the position of said positioning holes in the blade and of the positioning studs on the holder being suchthat ordinary two-edged blades with the standard spacing of positioning apertures therein may, if de'- sired, be clampedA in said holder and be usedv as a make-shift if the proper blades therefor are not available.

The invention will now be described with reference to the accompanying drawing, in which:- Y

Fig. 1 shows a triangular blade.

Fig. 2 a square blade.

Fio. 3 a modification of the last, giving I greater iiexibility.

Figs. 4 and 5 are hexagonal blades.

Fig.v 6 is an octagonal blade.

Figs. 7 and 8 show fragmental portions of. the holder for blades such as those shown in Figs. 2 and 4.

Fig. 9 is a fragmental diagram showing a holder in section with guard plate and blade clamped in place.

In Fig. 1 the blade has three edges a, a', a a central stem lhole b and three positioning holes 0,10, c.

To give iexiblity the corners are removed and notched at d, d extend from the corners to the holes c, 0. g

It will be noted the numerals on the edges .of the blade indicate the dates on which the particular edge should be used. Considerin edge a this edge with thel face illustrate clamped to the holder will be used on 1st', 7th, 13th, l19th and 25th. Also on the 31st ,if the month is a 3l-day one. The same edge will be used with the other side clamped against the holder on 4th, 10th, 16th, 22nd and 28th. Hence this edge will be used for ten or eleven shaves, a number which a modern blade should be able to stand if the blade is kept clean, and has the suggested periods of rest. It will be seen the edge a is used on the first of the month and rests for three days. It is then used again on the fourth but withthe blade reversed side for side. Again it has three days rest and is used again. And so on.

In lFig.2 a square blade is shown.

four positioning apertures c', c. These apertures'c, c may be so placed apart as to suit the positioning apertures in ordinary razor blades like the Gillette. This spacing is so selected to enable an ordinary Gillette blade to be used as a make-shift in the holder provided. In Fig. 2 the inner edge of an ordinary blade is indicated by thee dotted line f. It will be seen that the blade edge may be made to avoid the central stem b.

A. blade as vshown in lFi 2 may be found too stili' it being now usua to clamp a wafer bladetightly inthe holder so as to cause it Vex in um direction of the 'axis A A wah the 'direction of the other axes B B. In such case the side edges would only be used when the blade was rotated relatively tothe holder through so that when in use the camher on the blade would be in the direction perpendicular tothe cutting edge.

In these various figures the date numbers on the blade are the numbers on the one side ofthe blade, whilst the date numbers out-- side the blade surface re resent dates stamped on the other side of the lade'. v

Fig.'3 shows a preferred form the square blade would take. The intention here is to use the blade on a holder the surface of which is raised in the middle-that is one having a convex surface Whose centre is higher than the sides'all round. .If a thin blade such as that shown in Fig'. '2 is clamped down on such a surface and forced to take up a saucer shape or flat domed-shape--the metal would offer very considerable resistance as a dome to deformation. There might be circumferential tensions at the periphery and a. rather uncertain stress distribution due to the de-l velopment of stresses such as are to be found in a flat dome. In Fig. 3 the full development of dome action stresses will be prevented and thel intensity of the stresses relieved by slotting or notching the corners as tempted to cause it tov take up a saucer shape.

Fig. 5 shows a development of Fig. l Wherein the corners are notched or slotted as in Fig. 3.

Fig. 'shows an octagonal form of blade. It should be noted that in these blades the corners should preferably be removed as indicated at l, Zin Figs. 3, 5 and 6.

In Fig. 6 some of the slots stop at the positioning hole 0 whereasothers are continued to points such ask.

In Figs. l, 2, 4 and 6 a convenient system of date numbers is shown. It will be seen that whereas with the square blade each edge is used approximately eight times, with thehexagonal blade the edge is used five times, and with theoctagonal blade four times.

The edges however are progressively getting shorter so that more Work is done with four shaves on the octagonal blade thanfin eight shaves with the square blade.

It is important to be able` to see the date numbers on the blade when clamped in the holder.

. The holder therefore may be notchedor apertured in any convenient manner to expose the dateiigures.

In Fig. 7 a-vlew is shown of the near side of a holder with the blade clamped to the further side.

This shows a square blade such as that `shown 'in Fig. 2. Theholder has the usual notches m, m on the edge but certain of these notches m ,m are extended'to a greater depth to expose the date numerals. 'l

This Figure 7 also shows apertures m, m. 'which may be used to expose the date numbers to view in place of the deeper notches m', m.

Fig. 8 issimilar to the first part of Fig. 7 but shows the-idea applied to a hexagonal blade holder.

Fig. 9 indicates a form of construction in which n is the holder, 0 the guard, p the stem of the guard and r a positioning stud on the holder. The blade v is stressed by bending to the curve shown.

The central portion of the bent surface of diameter s acts likea flat d ome the limits of which are to -be seen dotted at s in Fig. 5. The outer parts t, t ofthe blade owing to the slotted corners are stressed in ure bending.

' In Fig. 9 the dome part ta es the curve the extension of .which is shown dotted at lv whilst the outer portions of the blade are bent to a sharper radius the vextension of which is shown by the dotted line fu.

It will be understood that by varying the distance to which the slots g, extend towards the centre of the blade the proportion which develops a dome-like resistance and that which is merely bent downwards may be varied as desired.

It should be noted that where in this specification reference is made to dome-like stresses it does notnecessarily mean stresses such as are developed in a masonry dome but to stresses which are developed in a thin metal sheet or plate when it is buckled or is forced to assume a saucer-like form from its original state in which it was flat. These *stresses are very different from those develand the edges are stiffened up by thedefor`v mation'.

blade having a lurality of cutting edges, identifying num ers corresponding to certain days of the month on said blade adjacent eachedge thereof, a Guard plate having a kplurality of teeth along its edges, the spaces between certain adjacent teeth along the edges of said guard plate -terminating 1n vcircular apertures to expose said identifying numbers on the blade.

2'. A safety razor comprising a holder, a multisided blade having indicia numbers from 1 to 31 corresponding to the days of the month adjacent the'edges of said blade, a toothed guard having the spaces between adjacent teeth further indented at spaced intervals to reveal said indicia numbers thereby to facilitate the Vsuccessive use of thel edges ofthe blade upon successive days of the month.

In testimony whereof I hereto affix myV signature this 4th day of June, 1931.

' ALBERT FRANK FORD.

Having now particularly described and as- I certained the nature of my said .invention and in what manner the same is to be performed, I declare that what I claim is 1. A safety razor comprising a holder, a

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