US2261275A - Electric razor - Google Patents

Description

ELECTRIC RAZOR Filed June 22, 1938 a z m NI 41R 5 0 V& T m Mr A JJ W I F fi 4 B 1 o Fatented Nov. 4, E41

' gUNlTED STATES. PATENT OFFICE.

ELECTRIC RAZOR Walter J. Pasinski, Howell, Mich. Application June 22, 1938, Serial N0. 215,083

3 Claims.

This invention relates to shaving devices of the type more commonly known as dry shavers or electric razors, and pertains more particularly to that portion of the razor-known as the cutting head.

The general object of this invention is to pro vide an improved electric razor.

Another object of this invention is to provide a more eifective cutting head which may be moved over the face of the user in any direction. A further object of this invention is to provide a cutting head which has a greater shaving area than those used heretofore. A still furtherobject of this invention is to provide an electric razor which requires less energy to operate than the usual razor of this type.

Fig. 3 is a separated perspective of the sev-- 'eral parts of the cutting head; and

Fig. 4 is a section through the cutting head taken along line 4-4 of Fig. 2.

As usual in this type of device, the operating mechanism is mounted within the handle and the cutting head is carried by one end of the handle. Accordingly,'in the device of the present invention, a housing 2 comprises the handle of the electric razor and the upper end of the housing or handle is recessed to detachably receive the body or supporting portion 3 of the cutting head which may be detachably secured to the casing by a set screw 4, as illustrated, or formed integrally with the casing 2. A circular member or spider 6 is attached to the body 3 by means of screws 1 with the plane of its face at an angle to the body 3 and casing 2. The memher 6 is provided with fingers 8 threaded at their outer ends for detachably securing a shear plate 5 der surface of the shear plate by a coil spring 2| or comb thereto, and is further provided with a central bore 9 for reasons later to be described.

Detachably connected to the spider 6 is a circular or cup-shaped stationary shear plate H adapted .to be passed over the face of the user and having an annular end or wall shaving surface 12, a depressed center portion 13 and an internally threaded peripheral wall [4 engaging the fingers 8. Any other suitable means for detachably securing the shear plate and spider may, of course, be employed. The annular shaving surface or end wall 12 is extremely thin, as is usual in this type of device, to permit shav ing substantially at the surface of ,the skin, and is provided with substantially radial slots I5 having parallel side walls and being open at both ends. The width of each slot approximates that of the hair of the human beard and may be varied accordingly. This annular formation of the shaving surface and arrangement of slots 15 provides a large shaving area having comb teeth extending in all directions which may be moved over the,face of the user effectively in any direction.

Positioned between the shear-plate and the spider "6 is an oscillatory cutter l6 comprising a disk having substantially radial cutting teeth I! extending upwardly and outwardly from the, disk portion. These cutting teeth I! bear against the inner surface of the slotted annular wall 12 of the shear plate and have parallel edges which cooperate with the parallel edges of the slots 15 to clip any'hairs entering the slots as distinguished from a shearing or scissor action.

The number of slots l5 and teeth l1 may, of

course, be varied but it has been found desirable to provide more slots than teeth and preferably in the ratio of about three to one, although this may be varied to meet certain conditions such as size and stiffness of the hair to be cut. By providing a cutter with less teeth than slots in the shear plate, the cutting action does not occur at one point in' the operation of the cutter, as is common inthe usual type of cutter, but is spread throughout the entire os- 40 cillatory movement of the cutter, thus distrib- The cutter is rotatably mounted upon a stud l8 (Fig. 4) which has a large end entering aperture 9 in the spider and a'small end entering an aperture l9 formed in the cutter. The cutter is yieldingly urged into contact with the unseated in the bottom of the aperture 9 and exerting pressure against the inner 'end of stud l8,'thus forcing the cutter upwardly against the inner surface of the shear plate and maintaining 5:) clipping contact between thetwo elements The;

shear plate, cutter, and spider are fitted with a very slight clearance of less than the diameter of a hair between the inner annular surface 23 of the shear plate and the cutter and also between the inner annular surface 24 of the spider and the cutter. This prevents any hairs from entering the inner portion of the shear plate and cutter even though no spring 2| its-provided. There is, however, little tendency for the hairs to enter the interior, because the spider mounting or manner of attachment of the body and shear plate leaves almost the entire rear side of the cutter head open, for the discharge of bails out by the cutter, and they will readily fall rearwardly and entirely free and clear of the cutting head. In other words, the cutting head is self cleaning.

The cutter is oscillated by means of an arm 25 pivoted intermediate its ends at 26 to the casing 2. One end 21 of arm 25 enters an aperture in the cutter adjacent its periphery and the other end is formed with a fork 28 which engages an eccentric 29 on the motor shaft 30 of the driving motor 3| housed within the casing or handle 2.

The motor 3| may be of any suitable type. Ac-

cordingly, as the motor 3| rotates, it oscillates the arm 25 and cutter l6 through a comparatively long stroke at a high frequency. It will be noted that although the cutting head utilizes an oscillating annular cutter set at an angle to the handle, the drive is very simple, being through a single eccentric cam and lever.

From the foregoing description it will be apparent that the essential parts of the novel cutter head may be manufactured cheaply. For instance, the body member 3 may be molded upon the casing 2 or die cast asa separate part, whereas the remaining parts, such as the shear plate II and cutter l6, may be stamped and readily finished by grinding the contactingand cutting surfaces. These grinding operations are also simplified because the entire surfaces to be ground are exposed. In other words, manufacturing conditions are greatly simplified over those for the usual type of cutting head. Shaving is facilitated because of the large shaving surface area with the slots 15 extending in different directions, which makes it possible for the cutting head to be moved in any direction over the face of the user. In so doing, it will comb hairs r growing in various directions into the slots 15, some of which are always open due to the difference in number of slots and cutter teeth.

It will be apparent to those skilled in the art that minor'changes may be made in the details of construction without departing from the spirit and scope of the invention as defined in the appended claims.

I claim:

1.-An electric razor comprising a handle, a cutting head mounted on one end of said handle, a circular grooved guard and shear plate on the top of said head, a circular cutter mounted in said head tooscillate under and in cutting relation to said shear plate, said head being positioned on said handle so that the'longitudinal axis of said handle intersects said cutter near its periphery, an electric motor in said handle having the axis of rotation of its armature shaft at right angles to the longitudinal axis of said handle, and a lever pivoted in said handle, one end of said lever having a cam slot in which is positioned an eccentric cam fixed to said armature shaft andthe other end of said lever extending substantially in line with the longitudinal axis of said handle to said head where it is positioned loosely in an opening in said cutter.

2. An electric razor comprising a handle, a cutting head fixed to one end of said handle with the plane of said head at an angle to the longitudinal axis of said handle, a circular, grooved guard and shear plate on the top of said head, a circular cuttcr mounted in said head to oscillate under and in cutting relation to said shear plate and in a plane parallel to that of said head, said inclined head being positioned with respect to said handle so that the longitudinal axis of said handle intersects said cutter near its periphery, an electric. motor in said handle having the axis of rotation of its armature shaft at right angles to the longitudinal axis of said handle, and a lever pivoted in said handle, one end of said lever being operably connected with said armature shaft to be oscillated thereby and the other, end of said lever extending substantially in line with the longitudinal axis of said handle to said head where it is directly connected to said cutter, whereby rotation of the motor armature rapidly oscillates the cutter in said inclined head.

3. An electric razor comprising a handle, a cutting head mounted on one end of said handle with the plane of said head at an angle to the longitudinal axis of said handle, a circular. grooved guard and shear plate on the top of said head, a circular cutter mounted in said head to oscillate under and in cutting relation to said shear plate and in a plane parallel to that of said head, said inclined head being positioned on said handle so .that the longitudinal axis of said handle intersects said cutter near its periphery, an electric motor in said handle having the axis of rotation of its armature shaft at right angles to the longitudinal axis of said handle, and a lever pivoted in said handle, one end of said lever having a cam slot in which is positioned an eccentric cam fixed to said armature shaft and the other end of said lever extending substantially in line with the longitudinal axis of said handle to said head where it extends into an opening in said cutter slightly larger than the end of said Ievenwhereby rotation of the motor armature rapidly oscillates the cutter in the inclined head.

WALTER J. PASINSKI.

Images