US1830563A - Safety razor - Google Patents

Description

Patented Nov. 3, 1931 UNITED STATES WILLIAM c; ROGERS, or cmc'aeo, IiaINoIs lsnrn'riz RAZOR.

Apliiication mea my 9, 192s. serial No. 291,313.

This invention relates to safety razors andis/fully described inthe following specifica-` tion and shown in the accompanying drawings, in whichview on line 1 -1 of Fig. Y V

Fig. 2 is a similar view on line 2-2 of Fig. 4;. p

Fig. 3 is an end elevation showing a modified form of the invention;y f

Fig. 4 is a top plan view of thesafetyra- -zor showing the handle removed; l

Fig. 5 is a transverse section on the line 5-5 'of Fig. 2. .'15

2 comprises a' cap 10 which has upwardly extending studs or preferably pins 11, one at each end and a centrally located screw 12. The pins and the screw are adapted to pass through suitable'openings 13 and 14, respectively, in a guard 15 which is adapted to o'ver-y lie and conform with the cap v10.

A hollow handle 16 is screw-threaded to receive the screw 12. When the'han'dle 16 is screwed thereon, it draws the guard 15" and the cap 10 together, thereby clamping a symmetrical, two-edged flexible razor blade 17 provided with the usual pin openings 18 and the screw opening 19,' between them in the usual manner. The cap 10 is constructed with a steep face 10aat one side and a sloping face 10b at the other, the side-edges ofthe two faces being designedly not equidistant from the plane z-.e drawn through the axes of the pins 11 and the screw 12, for a purpose v hereinafter described and which characterizes this invention.`

The guard yis preferably provided with laterally projecting teeth or ribs 20 and 21. The ribs 2() are tied together by means lof a bar 22extending along one edge and serving `to protect the edge 17a of the blade 17. In

this form, the bar 22 extends downto theA Figure 1 is an enlarged transverse sectional- The embodiment illustrated in Figs. 1y and tendency to cut deeper as it is set at a more rakishpangle to the surface of the skin B.

- It must be noted that we are here concerned ybeen heretofore-,placed in a linemidway between the long edges of the cap and seldom out of such ,midway line in safety razors lin which two cutting edges are simultaneously exposed for use, depending entirely for the lateral positioning (in the plane of the-blade) of the cutting edges on crude means which neglected entirely theI control of the unavoidable easement space betweenthepositioning holder-means vand the positioning blade-means. lAnd it is now proposed to show how 'a simple spring means attached to the blade positioning holder-meanscan positively prevent haphazard'mal-alignment -vduevto the neglect of such conventional easement space, and that such neglected easement spacecan be utilized to obtain anaccurately predetermined projection of the cutting edges of the blade, as well as othervaluable results.` y

j Therefore, the feature which characterizes this invention is the combination of auxiliary positioning resilient means with positioning rigid means, the axes of which `rigid means preferably lie out of the'plane y-y passed midway between the long edges of thecap and which plane yg/ is parallel to the plane a--e which includes said axes. See Figs. 1 and 3 for illustration.

The advantages arising from this novel automatic' lpositioning combination, while obvious enough after being revealed to those `with Ya device from whichgreatly different -results are obtained for variations of a thouskilled in the art, are: first, an accurate abutted blade controlby which a predetermined projection is obtained; second, a simple reciprocal and opposite difference in the projection vof. the cutting edges of a two-edged blade beyond the long edges of the cap; third, a refinement of such control involving automatic precision of ksystematic parallelism; fourth, such control may include a maximum-minimum novelty; and fifth, a combination of said four advantages with old art.

Advantage of old features is taken in devising the cap with the two slopes 10a and 10b, either alone or in combination with the guard which has the overhanging side bars 2.2 and 23. These refinements widen the field of shaving angles. The low angle of 10b which is preferably hollow-ground, gives a medium close shave, while the steep angle of 10a gives a closer shave. This is particularly true when 10a is used with the guard bar 23, this combination being shown in Figs. l and 2. It will be understood-that the guard 15 may be reversed so as to givev four combinations of height -of guard and angle of cap adjacent thereto, thereby providing four degrees of closeness of shave. As shown in Fig. Il, the corner 10d may be extended as in old art to protect the corner of the razor A blade and to prevent it from going` into the skin of the user. Y

In Fig. 3 is shown a modification of the cap which is designated as 10c, this cap being concave within and convex on the outside. The guard l5a is somewhat similar to the guard 15 but is curved to t the cap 10.v

Also the bars 22al and 23a lie preferably above the plane mof the upper surface of the blade, one bar being somewhat lower than the other to insure still other degre s of lineness of shave. In any of these f rms, the bar lies so close to the skinas t0 permit the lather topass over the bar as the bar is pushed along the skin, and in this device serves to present the hair to the cutting edge of the blade in a line of skin exactly parallel to but in a different plane Vwith respect to said cutting edge for each combination of cap and guard as hereinafter described.

In order to prevent the blade and guard from shifting with respect to the cap, the usual easement space. between the pins 11 and the edges of the openings 18 and 13 of the blade and guard, respectively, isutilized in the following ingenious manner, primarily to assist as auxiliary means to automatically project one cutting edge. while reciprocally withdrawing the other cutting edge a like distance. This action applies to the blade, first; then to the guard.

I provide the pins 11 with the spring clips 24 which are set in the recesses 25, Fig. 2, in the pins and have lingers4 26 adapted to extend into recess 27 in the cap, and to engage one part of the adjacent inner Vsurface of the openings 18 in the blade so as to keep the opposite part of the inner surface 18a of said openings against the pins 1l. It will also be observed that the handle 16 rotates in a clockwise direction about the screw 12 A when the handle 16 is screwed down into tight Contact with the guard.

-as a washer between the blade and the handle,

thereby transmitting a perpendicular thrust tothe blade. 'And moreover the blade and guard are in an abutted position before such possible tortion becomes effective. Any pos- 'sible clockwise thrust from the guard to the blade is further minimized by the difference in material between the soft metal guard and the hard smooth blade. The openings 13 are preferably devised of less width in the guard than the openings 18 .in the blade so that when the guard is positioned l011 the pins 11 it receives the thrust .from thellingers 26 into contact with the pins l1 so that the long edges of the guard shall be parallel to the long edges'of the cap. Thus Athe blade and guard are positioned in parallelism relative -to the cap and a uniformity o f shaving action is guaranteed.

In Figs. 2 and 4, the fingers 26 of the spring clips are shown facing the edge of the cap from which the pins are further, thus causing a minimum parallel projection of the blade tothe left beyond the cap. In Fig. 3, the fingers 26 are shown on the other side f the pms, and a maximum parallel projection in the same (left as shown) direction results. And quite obviously, a single spring on the side of a pin toward the end of the cap or holder would readily be adapted t0 co-act with inherent mechanical parallelpositioning means in a blade to take up any looseness between said blade and cap and automatically produce the desired parallel positioning.

While I have shown and described but a single embodiment of my invention, itis to be understood that it is capable o fmany mod'- ifications.- Changes, therefore, in the construction andj arrangement may be `'made which do not depart from the spirit and scope of the invention as covered by the appended claims.

I claim: A

l. In a safety-razor, a cap, a guard, a handle, a blade and means for clamping said parts in position for shaving, said cap being provided with combinedpositioning resilient and rigid means adapted to co-act with apertures provided in said blade to insure parallelism of ,said cap and blade by automatically taking up any looseness due to the lateral Aeasement space between said/cap and blade means for clamping a double-edged blade cent supporting edge of the cap as the razor between said cap and guard, said cap being provided with combined positioning spring and `,pin means, said pin means lying out of the longitudinal aXis of said cap, said com bined means being adapted to co-act with positioning pin openings in said blade to automatically take up any looseness between said cap and blade due to the longitudinal easement space between said cap pins and blade openings by moving said blade endwise along sald cap, as said parts are assembled.

3. In a safety razor, a cap, a guard, and means for clamping a double edged blade between said cap and guard, said cap being provided with rigid blade-positioning means, said rigid means being in turn provided with `resilient blade-positioning means thereon whereby to co-act with positioning means inherent in the blade and automatically take up any looseness due to the easement space between said cap and blade and force said blade into accurate alignment with said cap as said parts are assembled.

4. In a safety razor, a cap, a guard, and means for clamping a blade between said cap and guard, said cap being provided withA blade and guard positioning pins attached thereto and lying out of the longitudinal axis of said cap, said pins being provided with spring means thereon whereb to co-act between said blade and cap, an between said uard and cap, and automatically take up any ooseness du'e to the easement space between said parts as said parts are assemble 5. In a safety razor, a blade, a guard, a handle, and a unit comprising a cap having means in-combination with said handle for clamping said parts together, said blade and Guard having positioning apertures, said cap eing provided with studs smaller than said apertures whereby the blade and guard may be shifted with reference to said unit, resilient means mounted on said unit and located at the sidel of each stud whereby the cap, blade and guard may be automaticall aligned while said razor is being assembled.

6. In a safety razor, a cap, a guard, a handle and a blade, means for clamping said parts together in shaving position, said guard and blade having positioning apertures, said cap member having positioning pins and a clampingv handle-engaging stud smaller in diameter than said apertures whereby an easement space is provided wherein said blade and guard may be'shifted with reference to said pins, said pins having resilient means mounted thereon and projecting from one side of each pin, whereby one cutting edge of the blade may be caused to move outward lfrom the adjacent supporting edge of the cap a. distance equal to the said easement space whlle reciprocally moving the other cutting edge a like distance inward toward the adjaf is assembled.

my hand this 6th day of July WILLIAM 1928. d. ROGERS.

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