US2700816A - Electric shaver - Google Patents

Description

S. P. WINTHER ELECTRIC SHAVER Feb. 1, 1955 2 Sheets-Sheet 1 Filed NGV. 28, 1952 IN VEN TOR.

S. P. WINTHER Feb. 1, 1955 ELECTRIC SHAVER Filed Nov. 28, 1952 2 Sheets-Sheet 2 4% Ji l nzswavllll A Swan P Wmfher 1N VEN TOR.

United States Patent 2,700,816 ELECTRIC SHAVER Simon P. Winther, Chicago, Ill., assignor of forty per cent to Leslie Krueger, Chicago, Ill.

Application November 28, 1952, Serial No. 322,945 1 Claim. (CI. 30-43) This invention relates to new and useful improvements and structural refinements in electric shavers, and the principal object of the invention is to provide a shaver which is very simple in construction, which may be efficiently and conveniently manipulated and which may be readily dissenibled for the purpose of conveniently replacing some of its components when they become worn after a period of use.

Particular, the invention concerns itself with the provision of a shaver having a rotary, frusto-conical head carrying a set of cutter blades which are engageable with the inner surface of a foraminous wall for whisker shearing purposes, an important feature of the invention residing in the provision of means for resiliently and yieldably mounting the cutter blades on the rotary head so that the blades are yieldably urged in frictional engagement with the foraminous wall and also, so that such blades may be conveniently and expeditiously replaced, when necessary.

Some of the advantages of the invention lie in its simplicity of construction, and in its efficient operation and in its adaptability to economical manufacure.

With the above more important objects and features in view and such other objects and features as may become apparent as this specification proceeds, the invention con sists essentially of the arrangement and construction of parts as illustrated in the accompanying drawings, in which:

Figure l is a perspective view of the invention;

Figure 2 is a longitudinal sectional view thereof;

Figure 3 is a transverse sectional view, taken substantially in the plane of the line 33 of Figure 2;

Figure 4 is an enlarged fragmentary sectional view illustrating the structural arrangement of the rotary head and blade;

Figure 5 is an exployed perspective view of the rotary head and one of the blades, springs, and keeper elements; and,

Figure 6 is a fragmentary sectional detail, on an enlarged scale taken substantially in the plane of the line 66 in Figure 2.

Like characters of reference are employed to designate like parts in the specifications and throughout the several views.

Referring now to the accompanying drawings in detail, the electric shaver is designated generally by the reference character 10 and embodies in its construction a suitable housing 12 equipped with a removable end wall 14 and also provided with a tapered extension 16, the latter being equipped with a foraminous top wall 18.

The top wall 18 is adapted to be brought in contact with the skin on which whiskers are to be shaved, and it is to be observed that the top wall 18 is of a substantially semi-circular cross-section (see Figure 3) since the top wall, in fact, is in the shape of a portion of the lateral surface of a cone.

A suitable electric motor designated generally by the reference character 20, is mounted by fastening elements 22 in the housing 12 and includes a drive shaft 24 which projects into the extension 16 coaxially with the top wall 18. The motor receives its supply of current through a suitable attachment cord 26 connected to terminals 28 on the end wall 14 of the housing.

A substantially frusto-conical head 30 is secured to the drive shaft 24 for rotation therewith and is provided with a plurality of longitudinally extending slots 32.

These slots receive therein elongated cutter blades 34 which are provided in outer edge portions thereof with pairs of notches 36. The blades 34 are of such height that they project outwardly from the lateral surface of the head 30.

A substantially U-shaped keeper element 38 is mounted by a fastening screw 40 in a substantially U-shaped recess 42 provided in the lateral surface of the head 30 2,700,816 Patented Feb. 1, 1955 adjacent each of slots 32, the side portions of the recess 42 being intersected by the slot 32 as is clearly shown in Figure 5, so that when the keeper element 38 is installed in the recess 42, the side portions 38' of the keeper element are disposed in the notches 36 of the associated blade 34. In this manner, the several blades 36 are sustained in position in the slots 32, and it is to be observed that the slots also accommodate angulated springs 44 which are disposed in the bottom of the slots so that they engage the inner edges of the blades 34 and thereby urge the blades outwardly from the head 30 into engagement with the intersurface of the foraminous top wall 18 of the extension 16.

The springs 44 have inturned end portions 44A, 44B, disposed at the ends of the head 30, so as to prevent the springs from shifting longitudinally in the slots 32.

When the invention is placed in use and the outer surface of the foraminous wall 18 is brought in contact with the face, rotation of the head 30 and the blades 34 thereon will cause the blades to shear the whiskers which project inwardly through the apertures in the wall 18. It is to be noted that by virture of the coaxial disposition of the shaft 24 with respect to the wall 18, the blades 34 will engage the entire inter-surface of the wall 18. However, the side and bottom portions of the housing extensions 16 are spaced from the head 30 sufficiently so that the blades 34 do not contact the same, whereby the cut whiskers may drop off the blades and accumulate in the lower portion 16A of the extension 16.

When it is desired to replace the blades 34 after a period of use, the foraminous wall 18 may be readily removed by pressing opposite side portions thereof inwardly so as to retract flanges 45 at lower edges of the wall 18 from keeper grooves 46 which are formed in the housing extension 16A. It should be understood that the wall 18 is sufficiently resilient so as to normally sustain the flanges 45 in the grooves 46. The blades themselves may be readily removed by simply removing the fastening screws 40 and the keeper elements 38, as will be readily understood.

By removing the fastening elements 22 and the end wall 14, the motor 20, head 30 and blades 34 may be withdrawn from the housing as a unit.

lt is believed that the advantages and use of the invention will be clearly apparent from the foregoing disclosure and, accordingly further description thereof at this point is deemed unnecessary.

While in the foregoing there has been shown and described the preferred embodiment of this invention it is to be understood that minor changes in the details of construction, combination and arrangement of parts may be resorted to without departing from the spirit and scope of the invention as claimed.

What is claimed as new is as follows:

An electric shaver comprising a substantially cylindrical housing provided integrally at one end thereof with an extension having an open top and including a pair of side walls formed adjacent the open top with a pair of opposing keeper grooves, a substantially resilient and foraminous top wall removably positioned on said extension and having a semi-circular cross-section, outturned flanges provided at side edges of said top wall and seated in said keeper grooves, an electric motor provided in said housing and having an armature shaft disposed in said extension coaxially with said top wall, a head mounted on said shaft and a set of cutter blades carried by said head and engageable with the inner surface of said top wall, said top wall having a configuration corresponding substantially to a half of the frustum of a cone, said top wall being straight in a plane radial to the axis of said shaft and said blades having straight cutting edges complemental to the inner surface of the top wall.

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References Cited in the file of this patent UNITED STATES PATENTS

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