US1726570A - Safety razor - Google Patents

Description

Sept. 3, 1929.- w KEENE 1,726,570

SAFETY RAZOR Filed July 1, 1925 l2 //VV5NTUR Patented Sept. 3, 1929.

UNITED STAT WALTER P. KEENE, OF LOS,ANGELES, CALIFORNIA.

' SAFETY RAZOR.

Application filed July 1,

My invention relates to improvements in safety razors of the type disclosed by the Hiskey' patents in which the blade is supported and held between two cylindrical surfaces with the blade edge flexed over an elongated helically cut slot, and the principal 01316013 is to provide a razor blade holder of sheet metal formed by low priced and easy method of manufacture. v I

It is also an object to provide a safety razor of this type in which is unnecessary to separate the parts to insert the razor blade, and without parts that may be misplaced.

It is a further object toprovide a safety razor in which the blade is readily inserted without the edge touching metal, and easily adjusted to suit individual requirements.

I attain these objects by the device illustrated in the accompanying drawing, in which Figure 1 is a perspective view of the device with blade in shaving position and the dotted line indicating the method of grasping the razor between the thumb and fingers.

Figure 2 is a longitudinal section on a helical plane intersecting the hinge axis and passing back of the cutting edge.

Figure 3 is a transverse section on the line 3-3 of Fig. 2 looking in the direction of the arrows.

Figure 4 is a top view, a portion of the outer shell being broken away to show the locating pin of the inner shell.

Figure 5 is a section on the line 55 of Fig. 4 viewed in the direction indicated by the arrows.

Figure 6 is a plan view of the razor blade and Figure 7 an edge view of the same.

In the drawings, numeral 10 designates the outer shell or casing preferably formed of sheet metal in a punch press, consisting of an outer skin contacting surface with a helical cut tapered edge 11, the centers of the radii of this surface forming the axis of the bores formed in the side walls 12 and 13, these walls being preferably formed in planes at right angles to the axis, these walls taking the place of a handle as of the familiar hoe type of safety razor, the walls being grasped as shown by the dotted lines of a hand in Figure 1, a convenient position for use in under arm work, although an equally convenient method is to grasp the rear part of the shells as outlined by line 14:, between the thumb and fingers, either of these methods serving where the handle grasp of an operator is lost.

1925. Serial No. 40,784.

Supported within the outer shell is a second shell of substantially the same form, drawn of sheet metal, in which the cylindrical and approximated surface to the inner cylindrical surface ofshell 10, is struck from radii of less length, so that when they are assembled, there is formed an arcuate cylindrical space adapted to receive and hold the razor blade.

, Outside the true cylindrical surface 15 is the helically cut slot, so formed thatits inner edge 16 falls approximately under the edge 11 when in operative position and supported in such position to shell 10 by the pivot pins 17 and 18 connecting the approximated walls of the inner shell, as indicated by 19 and 20 to the adjacent walls 12 and 13,

so that the inner shell swings concentrically within. the shell 10, or slightlyeccentric as preferred, this swinging movement being limited by stops 22 and 23 upsetupon wall 13.

Also preferably upset upon the cylindrical surface 15 and extending toward the shell 10 are blade locating pins 23 and 24, the latter next the wall 20 being closer to the edge 16 of the slot,'the outer edge 25 of the slot being preferably upset into a plane of a continuation of the outer cylindrical surface of shell 10 to form a guard 26, so that the full function of protection and holding the skin unwrinkled is performed asfirst disclosed in the patents referred to.

The blade is cutwith bias edges parallel to each other and'agreeing with the pitch of the-helical slot, shown as one to twelve or approximately an angle of seven degrees, the toe edge 27 having a slotted notch 28 adapted to engage the pin 24 and the opposite or heel edge 29 having a notch 30 slightly to the rear of the notch 28 to engage the pin 23, the blade being otherwise of the general parallelogram form of the ordinary safety razor of thin, flexible and equal thickness steel, with a cutting edge 31 and back edge 32.

To insert and secure the blade, the shell 10 is preferably grasped between the thumb and fingers of the left hand, the right hand grasping the bar 26 and pulling the same out until its side wall 20 engages with the stop 22 this bringing the pin 21 to a point just under the edge 11 and the pin 24: just outside edge 11, then the right hand is moved to grasp the razor blade with its back 32 towards the shells and the edge 29 slipped into position between blade slides over the pin 24: and notch 28 engages therewith, and further inward movement assisted by the middle finger in engagement with bar the guard 26, the shell 15 and blade engaged therewith are pushed into operative position, the blade edge over the slot until the desired exposure of the edge is reached, or the wall 13 taking up against the stop 21, this latter being so placed as to prevent the edge of the blade from catching under the edge 11. Grooves may be cut in the inner surface 10 to accommodate the blade locating pins and their termination act as a back stop.

At no time is any portion of the blade edge in contact with metal to injure its sharpness and the whole length of the edge exposed, and the frictional contact with the inner approximated surfaces of the shells acts as a sufficient grip to secure the blade in any position intermediate the stops so that the closeness of the shave may be regulated to suit individual desire.

The riveted heads of the pins 17 and 18 offer resistance to the grasp by thumb and fingers as shown in Figure 1, and the inclined blade edge performs the function of a draw out, the razor sliding from toe to heel by law of resistance, the conventional form of teeth not being essential to the guiding of the hairs in this type of true shaving razor.

I claim:

1. A safety razor comprising a shell formed of a helical section of a cylinder and inder of less diameter and provided with end walls of less width than said first shell, means to hinge said end walls that the cylindrical sections are spaced apart to form a support and gripping means for a razor blade.

3. 'A safety razor comprising a shell formed of a helical section of a cylindrical tube and provided with end walls in planes intersecting the axis of said cylindrical tube, a second shell of substantially the same form but of a cylindrical section of less diameter and end walls spaced a'partto fit within the end walls of said first shell, a flexible razor blade, and means to hinge said end walls that said shells will be spaced'apart at their opposed helical sections to form a pocket and gripping support forsaid razor blade. 1

4. A safety razor comprising a metal shell having an arcuate formed razor contacting surface, a second shell adapted to behinged in relation to said first shell and provided with a helically formed slot adapted to register adjacent the helically cut edge of said first shell, means to hinge and limit the movementof said shells, and a razor blade adapt ed to contact with the first of said shells and be drawn into frictional engagement there with with its cutting edge located over said slot, by the movement of said second shell in relation to said first shell.

5. A safety razor comprising a metallic shell having an arcuate razor blade contacting surface provided with stops, a second shell provided with staggered locating pins, adapted to be hinged in relation to said first shell between said stops, and having a slot adapted to register under the razor supporting edge of said first shell, means to hinge said shells, and a notched razor blade adapt ed to engage said locating pins on said second shell and thereby be drawn into position intermediate said shells with its cutting edge located over said slot by the movement of said shells,

WALTER- P. KEENE.

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