PATENT SPECIFICATION

Application Date : Oct. 24, 1942. No, 14948/42. Complete Specification Left: Nov. 28, 1942. Complete Specification Accepted: Jan. 17, 1944.

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PROVISIONAL SPECIFICATION. Dry Shaving Devices

558,703

I, Frederick Wilfred Knowles, of Grafton House Hotel, The Vale, Acton, London, W.3, a subject of the King of Great Britain and Ireland, do hereby declare the nature of this invention to be as follows:—

This invention relates to shaving devices o£ the type known as dry shavers, and has for its object a construction suitable for inexpensive mass-production.

The present invention comprises essentially a perforated shield of thin sheet material bent or flexed into arcuate shape, and a blade or a plurality of blades arranged to slide to and fro on the inside surface of the said shield, preferably in such a manner as to produce a self-sharpening effect.

A convenient construction comprises a perforated shield of thin stainless, steel flexed into arcuate shape and secured to a supporting frame. A blade with two parallel sharpened edges is arranged to slide to and fro on the inside surface of the said shield in such a manner as to nip or shear hairs protruding through the perforations in the shield. A handle is provided to slide the blade to and fro in the manner described, whilst the shield is adapted to rock from end to end over the surface to be shaved. The blade may be held in contact with the shield by pressure with the handle or by means of suitable springs. In order to ensure parallel motion of the blade in relation to the shield, the blade may be linked, hinged, geared or otherwise maintained in relation to the shield. The handle may be constructed in a manner as to permit turning or folding down towards the shield in order that the dry shaving device may be collapsed into compact form when not in use.

Dated the 24th day of October, 1942.

I, Frederick Wilfred Knowles, of Grafton House Hotel, The Vale, Acton, London, W.3, a subject of the King of Great Britain and Ireland, 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:—

This invention relates to shaving devices of the type known as dry shavers, and has for its object a construction suitable for inexpensive mass-production. The present invention comprises essentially in combination a handle with a blade or a plurality of blades capable of moving to and fro on the inside surface of an arcuate shield of thin perforated material, which shield is so mounted that in being moved over the surface to be shaved, it partakes of a rocking motion. The blade or blades may contact the shield in such a manner as to produce a self-sharpening effect.

A convenient construction comprises a perforated shield of thin stainless steel sheet flexed into arcuate shape and secured to a supporting frame. A blade with two parallel sharpened edges is arranged to slide to and fro on the inside surface of the said shield in such a manner as to nip or shear, hairs protruding through the perforations in the shield. A handle is provided to slide the blade to and fro in the manner described, whilst the shield is adapted to rock from end to end over the surface to be shaved. The blade may be held in contact with the shield by pressure with the handle or by spring tension. In order to ensure parallel motion of the blade in relation to the shield, the blade may be linked, hinged, geared or otherwise maintained in relation to the shield.

In the accompanying drawings, Fig. 1 is a side elevation of a dry shaving device constructed according to this invention.

Fig. 2 is a front elevation.

Fig. 3 is a side view in section.

Fig. 4 is a front view in section.

Fig. 5 is a front view in section of a modified construction.

Fig. 6 is a side view in section.

Fig. 7 is a view in plan.

Fig. 8 is a side elevation.

Referring to Figs. 1, 2, 3 and 4, a perforated shield 1 of thin stainless steel sheet is soldered with its edges to a frame 2 which maintains the shield flexed in arcuate shape. A handle 3 carries a slotted rectangular blade 4, which is of a springy nature, and bent so as to have two parallel sharpened edges pressed into contact with the shield 1. The frame 2 is linked to the handle 3 by an arbor 5, which is retained by a screw 6. The frame is free to rotate in relation to the handle through a sufficient angle to enable the blade to slide to and fro across the perforated area of the shield.

Referring to Figs. 5, 6, 7 and 8, which depict a modified construction, a perforated shield 7 of thin stainless steel sheet is soldered with its edges to a frame 8 which maintains the shield 7 flexed in arcuate shape. A sliding member 9 is guided in slots 10 of the frame 8 and is capable of sliding to and fro in the said slots. The sliding member 9 carries a slotted rectangular blade 11 which is of a springy nature and bent so as to have two parallel sharpened edges pressed into contact with the shield 7. A handle 12 is hinged to the sliding member 8.

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:—

1. A manual dry shaving device comprising in combination a handle with a blade or a plurality of blades capable of moving to and fro on the inside surface of an arcuate shield of thin perforated material, which shield is so mounted that in being moved over the surface to be shaved it partakes of a rocking motion.

2. A dry shaving device according to Claim 1, wherein the said blade or blades are of a springy nature, and arranged to have a cutting edge or a plurality of cutting edges in contact with the inner surface of the said arcuate shield at a suitable angle to produce a self-sharpening effect on the blade in operation.

3. A dry shaving device constructed and arranged substantially as hereinbefore described and as illustrated by Figs. 1, 2, 3 and 4 of the accompanying drawings.

4. A dry shaving device constructed and arranged substantially as hereinbefore described and as illustrated by Figs. 5, 6, 7 and 8 of the accompanying drawings.

Dated the 28th day of November, 1942.