N° 3,504 A.D. 1914

Date of Application, 11th Feb., 1914 Complete Specification Left, 21st July, 1914—Accepted, 10th Sept., 1914 PROVISIONAL SPECIFICATION. Improvements in Safety Razors.

I, Thomas Wild, of 143, St. Paul's Road, Moseley, in the City of Birmingham, Gentleman, do hereby declare the nature of this invention to be as follows:—

The invention relates to a safety razor of the kind in which the blade is positioned and clamped a fixture between a backing plate and a guard having registering transverse curvatures to strain the blade during fixing from flat to have a transverse curvature.

The invention provides so that in addition to the blade being strained or bent with the transverse curvature aforesaid it is also simultaneously strained and fixed with a diagonal curvature, which has the effect of giving greater support and rigidity to the cutting edges of the blade, and of fitting each cutting edge, or setting it at an inclination to the axis of the handle of the razor instead of at right angles, so that in the operation of the blade there is what is commonly known in cutting tools as an inclined longitudinal edge. The backing plate and the guard plate, between which the blade is strained, clamped, and fixed, are both diagonal curved as well as transversely curved, these parts having put into them by shaping a sort of longitudinal twist, which in clamping the blade between them forces a similar twist in the blade.

Dated the 10th day of February, 1914.

I, Thomas Wild, of 143, St. Paul's Road, Moseley, in the City of Birmingham, Gentleman, do hereby declare the nature of this invention and in what manner the same is to be performed, to be particularly described and ascertained in and by the following statement:—

The invention relates to a safety razor of the kind using a thin flexible and resilient blade which is positioned and clamped a fixture between a back plate and a guard plate, the latter having rigidly applied to it the handle by which the razor is held for use. Said handle is usually of straight rod form extending from the guard plate at right angles.

It is known to provide the back plate and guard plate with registered transverse curvatures, to strain the flat thin blade during positioning and clamping to a corresponding curvature, the cutting edges of said blade after the straining being still at right angles to the axis of the handle.

The invention provides for the blade being additionally strained or bent and clamped, and fixed in a manner setting its cutting edge or edges at an inclination to the axis of the handle, or at an inclination to the direction of hand pull from the handle, to, in effect, provide in a safety razor what is commonly known in cutting tools as an inclined cutting edge. The back plate and the guard plate are each bodily formed with a longitudinal twist, or are upon their clamping faces shaped in such manner that when the blade is strained and clamped a fixture between them it has a diagonal curvature put into it in addition to a transverse curvature setting its cutting edge or edges inclined to the axis of the handle, the back plate and guard plate being correspondingly set inclined, to the axis of the handle to give the requisite support to the cutting edge or edges for its or their full length. In this way each cutting edge of the blade comes into operation from the hand pull on the handle in the same manner as an inclined cutting edge in a carpenter's chisel would do from a straight line operation of the chisel, and said cutting edge is additionally strengthened and has increased rigidity imparted to it.

The improvements aforesaid and hereinafter clearly stated in the claims are illustrated carried into effect by the accompanying sheet of drawings.

Fig. 1 is a side elevation of the razor head and part of the handle.

Fig. 2 is a left hand end elevation of Fig. 1.

Fig. 3 is a transverse section of Fig. 1 on the dotted line A, looking to the left.

Fig. 4 is a section on the dotted line B Fig. 1 looking to the left.

Fig. 5 is a section on the dotted line C Fig. 1 looking to the left.

Fig. 6 shows an end elevation of the guard plate and handle separate.

Fig. 7 shows an end elevation of the back plate and its parts separate.

Fig. 8 shows an end elevation of the flat blade.

Except for the shaping of the back plate a and the guard plate c, and the consequent straining to the same shape of the blade d, the construction and arrangement of the razor are well known. c² is the handle rigidly carried by the guard plate and by which the razor is held for use. a² is the centre pin passing axially through the handle c² to be engaged by a sleeve nut (not shown) applied at the outer end of the handle, and a³ a⁴ are the positioning pins carried by the back plate to engage registering holes of the blade and the guard plate for purposes well known. The teeth on the guard plate are as usual at c³.

The clamping faces x and y of the back and guard plates are shaped with a registering longitudinal twist providing, as shown, a diagonal curvature, and when the flat flexible resilient blade d is strained by clamping it between these faces the cutting edges d² d² of said blade are set inclined to the axis of the handle c², so that a hand pull from the handle in using the razor brings inclined cutting edges into operation, giving a slanting or inclining cut. This setting of the cutting edges inclined to the axis of the handle is very clearly represented by Fig. 1. The blade so set has therefore a diagonal curvature as well as a transverse curvature from a bend which is substantially a longitudinal twist, and this has the effect of materially strengthening the cutting edges as well as assisting the ease of shaving, particularly, in the case of a stubborn beard.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is:—

A safety razor in which the cutting edge or edges of the blade is or are set inclined to the axis of the handle, or to the direction of hand pull from the handle, by shaping the clamping faces of the back plate and guard plate between which the blade is strained or bent, with a longitudinal twist, putting a diagonal curvature into said blade in addition to a transverse curvature, substantially as and for the purposes described with reference to the drawings.

Dated the 16th day of July, 1914.