US2647308A - Safety razor - Google Patents

Description

Aug. 4, 1953 D. A. DomsoNl SAFETY RAZOR I Filed Sept. 14, 1951 Patented Aug. 4, 1953 UNITED lSTATES `PATENT [OFFICE SAFETY RAZOR,` David A. Dodson, Las Vegas," Nev. Application September 14, 1951, Serial No. 2.4.6,670I

2 Claims.

The vpresent invention relates to an improved construction of safety razor which embodies advantages not found in the conventional types of safety razors. The invention provides a construction of a razor which is simple and inexpensive', both from the standpoint of manufacture and sale, and which affords positive protection to the user against cutting or nicking of the skin during shaving.

One of the disadvantages inherent to the conventional types of safety razors is the likelihood ofthe user accidentally nicking or cutting his skin or flesh during shaving, causing tenderness of the skin, imperfectly shaved areas, sore spots, and other objectionable features. Many attempts have been made to overcome this deficiency which isv universally present in all conventional types of safety razors, either using double-edged blades or single-edged blades, notwithstanding many efforts have been made to eliminate such defects, which usually is caused by the razor head -or guard imperfectly protecting the skin of the shaver against direct contact with the cutting edge or corners of the blade.

- A further drawback inthe standard types of safety razor'lies in the fact that in order to remove the blade, a plurality of intertting and mutually dependent parts of the razor must be disassembled to remove a dulled blade for replacement With a new and serviceable blade, with the likelihood of accidental misplacement or loss of one or more of the parts. Efforts which have been made to make such razors in one piece have met with indifferent success, since the resulting constructions are relatively complicated and easily get out of working order.

-V The present invention provides an improved safety razor which` positively protects the user against the danger ofnicks and cuts, and which minimizes replacement of the cutting blade, as it embodies self-sharpening features .which maintain the blade in good shaving. condition over indefinitely long periods of time.

p A further object of the invention isto provide a rotary-type of safetyrazor that is simple in construction and easily used for shaving, while being inexpensive to manufacture and sell.

A further object of the invention is to provide a safety razor of the above-indicated character in which the intertting parts can be disassembled'and reassembledreadily whenever desired,

but which can bemaintained assembled in useable condition over long periods of time. A further object of the invention is to provide a razor of the above-indicated character which embraces novel means for transmuting linear or rectilinear movement into rotary movement'for' shaving.

Further objects andv advantages of the present improved construction will` become apparent as the description proceeds, and the featuresl of novelty will be pointed out in particularity inthe appended claims.V

The accompanying drawing illustrates an exemplary embodiment of a constructionv of a safetyV razor including the improved features of the present construction, in which: Fig. 1 is a side elevational view of thedevice with parts broken away and partly in section.

Fig. 2 is a longitudinal section taken on the line II--II of Fig. 1.

Fig. 3 is an exploded perspective view of the rotor, rotor drive and actuating elements, and blades disassembled. 1

Fig. 4 is a sectional view taken on` the line IV-IV of Fig. 2 looking in the direction ofthe arrows.

Fig 5 is a plan view of a blank for Aforming the spirally slotted rotor actuating means shown S in Fig. 3, and in dot and dash lines in Fig. 5. a"

ing or housing adapted to contain the razor struc'-v The perforations l arealigned as indicated in'V Fig. l, and are of sufficient size and frequency to assure even access of the beard hairs to the cutting bladesv 2, responsiveto pressure of the razor head against the face.

For mounting the blades 2, which are'shown to be relatively narrow, double-edged blades, the rotor C has end flanges 3 and 4, that are provided with aligned recesses 5 and B which vare adapted to receive snugly the end'lugs 'l and 8 forretaining the blades 2 vin mounted position on the rotor C, the blades 2 are curved transversely toV conform somewhat to the cylindricalperiphery of the rotor zC, ibut on a vvsomewhat'longer radius,v so as to leave a cutting clearance between"thev edges of the blade and the rotor C. The rotor C is closed at one end by a closure member 25 of greater diameter than that of said rotor and which forms the flange 3, the ange 4 being formed on the rotor at its opposite or open end.

The rotor C is actuated by an inner tubular cylindrical rotor D, which is formed with oppositely disposed spiral slots 9 and I0, the inner rotor D being formed from a blank II, that is in the shape of a parallelogram with parallel sides I2 and I3 and oblique ends' I4 and I5, the blank II having a longitudinal slot 9 therein. When the blank is turned so as to bring it into a cylindrical configuration with the ends square or in a vertical plane, the body of the blank is twisted correspondingly and the slot 9 becomes a spiral slot, the longitudinal edges-I2 and I3 forming the second spiral slot I 0, that is disposed oppositely to the spiral slot 9. The'blank.

II is cut to a size such that when it is bent into the-cylindrical rotor D, said rotor will nt inside of the outer rotor. (Land willreceive an actuating coil spring i8 positioned interiorly of .the inner rotor D and received and held in place in a flanged cylindrical seat I9 mounted the rotor D1and `slidable relative thereto longitudinally of the inner surfaceof said inner rotor.

This inner rotor D is actuated by a pin 2i) which extends throughA the opposite spiral slots 9 and I6 and which is mounted in a piston 2l actuated by a "piston rod 22 which passes through and is guided by an endy cap assembly 23 which closes one endof the razor assembly, the opposite end of the razor assembly being closed by the end 24 of the head B. The end cap or closure assembly 23 comprises a cap 26 that is threadedly received by an enlarged integral annular retaining collar 2l ofthe razor head B.

The projecting ends of thev pinZ engageabl in the oppositely disposed spiral slots 9 and I0 are adapted to impart vrotary motion to the rotor member D as the pin and spring seat I9 in the pistonV Il are moved inwardly 'responsive to` an inward thrust on the piston rod 22, thus compressing the spring IB' as the .inner rotor D is turned by movement of the pin 2B in the spiral slots 9 and I0. The rotor D is suitablyinterconnected with rotorC by a lug 2|' formed on said rotor D and engageable in aY groove 22 formedv in the inner surface of` the rotor Cat F,

one end thereof, and a lug 25' formed on the inner surface of the rotor C adapted to engage in the end 0f Spiral slot I0 at the opposite end and side of rotor D from the lug, 2l', when the rotor D is in operative position, as shown in Fig. 2. so that the rotation imparted to the rotor D bythe Din 2B operable in the spiralslots 9 and I0 is transmitted to the blade carrying rotor C, thereby turningY theblades 2 through a` corresponding rotary motion responsively to each inward thrust ofthepiston rod 22. The compression thus imparted to spring I8 returns the piston to its starting position responsively to the release of the actuating pressure on the piston rod 22, which pressure is imparted by the pressure of an operators finger. The action therefore is an oscillating rotary movement of the blades 2, the edges of which make wiping engagement with the inner surface of the perforated razor head B, Which's assmooth mechanically as it is possible to ob- This wiping Contact shaves off the hairs entering the perforations I with a closeness corresponding to the pressure of the razor head against theface. The razor head B is madeof thin metal to permit a close shave being obtained through d the use of the razor, while preventing all possibility of injury to the skin or esh of the user.

The piston rod 22 is square in cross section and the aperture in cap 26 is likewise square, so that the ends of pin 20 will reciprocatingly move in iixed longitudinal paths in effecting rotary movement of rotors D and C.

When the razor assembly is not in use, the outer casing A is slipped over it. The offset edge of the annular retaining collar 21 of the end closure assembly 23 forms a seat for the outer casing or housing A. The end of the casing A may be rounded into a rounded conical configuration as shown, but this is an immaterial detail.

Piston rod 22 terminates in an actuating head 2%!,which is adapted to be engaged by the thumb or :linger of the operator. For shaving, the outer casing or housing A- is removed, uncovering the holes-l in the razor head B. The apertured por-` tion is held in the same hand of the shaver as actuates the piston rod 22, and the apertured surface .of the head is pressed against the skin so as to cause the hairs of the beard to enter the holes I. Inward pressure on the actuating head 29 on piston rod or stem 22 forces the spring seat lil` and the pin 29 inwardly, thus causing the seat to slide in the actuating rotor D when the pressure applied to the piston 2I exceeds .the pressure exerted by the spring IB, thereby come pressing the spring I8 between the movable spring seat I9 and the end closure 25. The movement of the piston and seat I9 causes the pin 2i! to slide in the spiral grooves 9 and I0 of the inner actuating rotor D, thereby causing the rotor to turn through an arc of approximately 360 deg. The connection between the Slotted actuating rotor D and the outer blade carrying rotor C, causes this latter to turn through a corresponding arc, thereby imparting a shaving rotation to the blades 2. Upon release of the pressure on piston rod 22, the compression of spring I8 returns the piston and rotor to their original position, thereby rotating the .blades 2 in the opposite direction, and since the blades 2 are double-edged, they will cut when rotating in either direction. Also, since the edges of blades 2 vmake wiping Contact with the smooth inner surface of the razor head B, the bladesbecome automatically ice-sharpened 'with each stroke. The razor is designed to be a so-called "dry shaver" thereby eliminating clogging of the holes i with accumulations of lather and debris, but when cleaning becomes necessary, the assembly can be taken apart easily for access to the blades and the blade-carrying rotorC. This rotor havin g a solid surface can be easily wiped clean when the blades vare removed by releasing the frictional hold between the end tabs 'I and 8 of the blades and thetab-receiving'recesses l5 and 6 in theend ilanges of the rotor.

The form of the construction herein illustrated and described represents one embodiment of a razor assembly embodying the improved features of this construction. It will be apparent, however, that the specifically illustrated and described embodiment of the invention can be lmediiied quite extensively without departing from the concept of the invention, and accordingly, it will be understood that it is intended and desired to embrace within the scope of this invention such modifications and changes as may be nece-s-l sary to adapt the construction of theinvention to. such various conditions and uses, as defined by the scope of the appendedclaims.

What is claimed is:

1. A rotary type razor comprising, in combination, a razor head provided with a multiplicity of perforations, a rotor mounted in the razor head, a cutting blade mounted on the rotor adjacent to the razor head and behind the perforations thereof, means on the rotor for removably holding the blade on the rotor in operative position, an operating rotor mounted interiorly of the blade-carrying rotor, interacting means coupling the operating and the blade-carrying rotors, a coil spring mounted in the operating rotor, rectilinearly movable, manually operative plunger means for compressing the coil spring, and instrumentalities for converting rectilinear movement of the plunger means into rotary movement for operating the operating rotor and bladecarrying rotor for rotatably operating the blade, rectilinear movement of the plunger means compressing the spring and rotating the operating rotor and the blade-carrying rotor, the spring returning the plunger means to original position responsive to release of pressure on the plunger means for causing rotation of the rotor and blades in an opposite direction.

2. A rotary type razor comprising, in combina- 25 tion, a razor head provided With a multiplicity of perforations, a rotor removably mounted in the razor head, a cutting blade removably mounted on the rotor, 'a driving rotor mounted in the -blade-mounting rotor, means connecting the driving rotor and the blade-mounting rotor, the driving rotor being provided with oppositely disposed spiral slots therein, a pin slidably mounted in the slots, manually operable, rectilinearly movable plunger means bearing against the pin, a coil spring in the driving rotor adapted to be compressed by the plunger means responsive to inward movement of the plunger means, the said inward movement rotating the rotor and blade in one direction, release of the plunger means enabling the spring to return the plunger means to original position, thereby rotating the rotors and blade in an opposite direction, and closure means vfor the rotors in the razor head for operation of the razor, While enabling separation of the rotors from the razor head responsively to removal of the closure means.

DAVID A. DODSON.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 2,049,547 Stein Aug. 4, 1936 2,213,872 Trochtenberg Sept. 3, 1940 f y2,235,326 Muros Mar. 18, 1941 2,547,077 Evans Apr. 3, 1951

Images