US2086716A - Shaving implement - Google Patents

Description

Jly 13, 1937.

JL F. KOEHLER SHAVING IMPLEMENT Filed Sept. 30, 1935 Patented July .13, 1937 i 2,085,715

UNITED STATES PATENT OFFICE snAvrNG IMPLEMENT James Frederic Koehler, Northampton, Mass. Application September 30, 1935, Serial No. 42,853 4 Claims. (Cl. 31o-43) This invention relates to an improved shaving tached to the base plate 4. The base plate 4 is implement which is easily manipulated and which attached to the handle i by screws or other suitis used to secure a close shave with rapidity and able means, and a post 5 is made a rigid part of safety. The machine does not require the use of the base plate. The post 5 carries the cutting 5 lather. blade 6, which blade is replaceable when neces- 5 'Ihe invention comprises an implement ln sary, and is firmly held on the somewhat enwhich a sharpened blade rests flatly against the larged outer end of the post by the clamping plate skin, the cutting edge being immediately adjacent 1 which is drawn tightly against the blade and to the skin, and a rotating slotted cylinder beats the post by the screws 8. The clamping surface the hairs against the cutting edge. The slots in of the post and the inner surface of the clamping 10 the cylinder are sufficiently narrow so that the plate are shaped to ilrmly hold the cutting blade skin cannot enter them, and is therefore preventin such a position that its cutting edge 9 is the ed from beingy cut by the keen edge. only part of the blade in contact with the rotating This form of machine provides a very close cylinder 2. The outer surface of the clamping shave, for by the disposition of the cutting edge, plate 1 presents a smooth surface to the skin. 15 the hairs are cut off iiush with the skin. The The contact line 9 of the cutting blade B and rotating cylinder presents only a small arc of its the curved face of the rotating cylinder 2 is 1ocircumference to the skin, the blade edge touchcated almost upon, or slightly to the rear of the ing the cylinder but slightly to the rear of the line of tangency made by the Skin upon the cylinpoint or tangenoy with the skin, and a guard beder, and the two lines are parallel. When prop'- 20 lng brought around the cylinder on the opposite erly set for a CIOS@ Shave, the Cutting edge 1S not side almost into contact with this tangent plane. more than ten one-thousandths of an inch behind The small area of contact which the cylinder the tangent line, as measured along the direction makes with the skin, together with the small of the skin surface, so that the hairs are severed speed of rotation and the small diameter of the almost exactly at the surface of the skin. It has cylinder, act to cause practically no discomfiture also been found that when so adjusted the Cutasl the cylinder moves over the skin. Nor are the ting blade 6 shows no tendency to dig into the narrow slots in the cylinder uncomfortable to the hard, smooth cylindrical surface. skin. The entire instrument can be easily and The rotating cylinder is provided with slots Ill safely moved about on the surface of the skin. into'which the hairs may project, and the rota- 30 The invention also comprises various details tion of the cylinder is directed to bring the hairs of the construction which details will be more against the cutting edge. The slots are cut nar-A fully set forth hereinafter and will also be emrow so that the skin cannot enter them, and the bodied in the claims. cylindrical surface therefore acts as a guard to 3,5 The invention is illustrated in the accompanyprevent the skin being brought against the cuting drawing in which Figure 1 is a front view of a ting edge and injured. The most emcient arshaving implement embodying my invention. rangement of slots seems tov be the herring-bone Figure 2 is a side View of the same. Figure 3 is pattern, which is easy to construct, and is illusan end view of 'the shaving head only and omits trated in the drawing. 1t comprises several series- 49 details of the base and handle. 1n Figure 3is also of slots lo, each series being sawed or milled or 40' shown a method for attaching a guard about the ground along a part of the curved face of the rotating cylinder, which guard has been omitted cylinder, all slots of one series being in plane from all other' figures for the sake of showing delaminae which constitute a parallel set. Any tail. Figure 4 is an enlarged section of the shavslot in one series is of such depth that it cuts ing head taken on the line iiii3 in Figures 1 through all generating lines lying within a 45 and 2. Figure 5 is a perspective view of a vportion quarter (or a sixth or an eighth) of the surface o of the rotating cylinder. the cylinder; the next series cuts through all The machine comprises ahandle l which fits generating lines withinthe adjacent quarter (or the hand and contains some appropriate source sixth or eighth) of the surface and in this way 50 of power, such as an electric motor, or the end of iour (or six or eight) series are out around the 5g a idexible4 shaft. From the handle projects a rocylinder. The common angle between the cylintating cylinder 2, attached to the source of power. der axis and any one series of parallel 'laminae No further bearings for this cylinder are required containing a given series of slots is alternately beyond those centering the source of power. A given an acute or an obise value in progressing bearing may be incorporated in the collar 3 atfrom one series to the ad acent sexies around the` 55 curved surface of the cylinder. Particular values of 45 degrees and 135 degrees are illustrated in the drawing, but it is understood that other values of these angles may be used as well. The alternating directions serve in a semi-oscillatory manner to bring-the hairs to the cutting edge from both side directions as well as from the front of the edge. This pattern of construction of slotson the cylinder surface will be referred to in the claims as the herring-bone pattern.

'I'he remaining surface of the cylinder is highly polished to slide easily over the skin. The diameter of the cylinder may be as small as is consistent with the bending strength of the material used. A small diameter is desirable to reduce unnecessary friction with that part of the skin not adjacent to the cutting edge. A diameter of about one-quarter of an inch has been found to be satisfactory. The length of the cylinder depends on the amount of clearance required by the source of powerin the handle to permit convenient manipulation of the implementv over the skin, and need not exceed three inches.

A guard Il as shown in Figure 3, or other suitable arrangements may be fitted about the rotating cylinder Ato prevent parts of the cylinder not adjacent to the cutting edge from touching the skin and causing unnecessary friction. Holes I2 in'this guard permit the cut hairs to be thrown free.

A modification of this implement consists in having two blades, one on each side of the rotating cylinder, and a reversible source of power,

so that the operator may Acause the hairs to be brought against either blade at will, and may v place that blade against the skin for shaving. The rotating cylinder herein described will serve this double purpose.

'I'he shaving implement described will shave surfaces bearing either long or short hairs, and will shave closely. The novel feature of the invention is the ability of the implement to shave closely, and that Without the aid of lather. That type of lather-less shaving implement which employs a shearing plate, or shearing plates, cannot cut the hairs shorter than the thickness of the shearing plate. In the implement herein described the cutting takes place exactly lon the surface of the skin. And whereas other types of implements employing keen blades will also cut on the skin surface, they require the use of lather to hold thehairs erect, while the latter purpose is herein accomplished by the rotating cylinder. Moreover the implement herein described offers a much better protection to the skin against accidental cutting by the sharpened edge than is found in most other shaving implements using a sharpened cutting edge. A further novelty in the herring-bone pattern of the slots on the cylinder lies in the accomplishment of an oscillatory effect through the more efflcient means of a rotation.r

It Will also be seen that the disposition of the slots in parallel laminae in the rotating cylinder permits of a rapid and inexpensive construction of these cylinders by multiple arrangements of saws, milling cutters, or grinding disks, and allows the use of hardened materials.

It will be understood that modifications can be made in the disposition of the cutting slots within the parallel laminae on the rotating cylinder, and also in the construction. arrangement and combination of the various parts of this shaving implement, Without departing from the scope and principle of my invention.

I claim: i

1. A shaving implement comprising a cutting edge to rest against the skin, a slotted cylinder rotating about its axis to bring the hairs against the cutting edge, where they are severed, the slots being cut in a herring-bone pattern on the surface of the cylinder and being narrow to prevent the skin from entering them and being injured at the cutting edge, with means for rotating the cylinder and for holding the cutting edge firmly against the cylinder surface.

2. A shaving instrument comprising a very thin shearing plate to rest against the skin, a slotted cylinder rotating about its axis to bring the hairs against the cutting edge, where they are severed, the slots being cut in the cylinder surface so that all parts of any finite length of one slot lie in a plane lamina of thickness equal to the slot width, the slot width being narrow to prevent the skin from entering and being injured at the shearing edge, with means forrotating the cylinder and for holding the shearing plate firmly against the cylinder surface.

3. A shaving instrument comprising a sharpened cutting edge to rest against the skin and to bear on a rotating slotted cylinder which brings the hairs against the cutting edge, the slots being cut in the cylinder surface so that .all parts of any finite length of one slot lie in a. plane lamina of thickness equal to the slot' width, the slot width being narrow to prevent the skin from entering and being injured at the cutting edge. with means for rotating the cylinder and for holding the shearing plate firmly against the` cylinder surface.

4:. An implement for shaving, comprising a handle incorporating a source of power, a shaving head on the end of the handle to hold a blade whose sharpened cutting edge rests against 'the skin, a rotating cylinder attached to the Ithe head to surround the cylinder except in immediate proximity to the cutting edge.

JAMES r.y KOEHLER.

Images