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Durham Duplex

PatentGB190712730

InventionImprovements in Razors

FiledSaturday, 1st June 1907

PublishedThursday, 5th December 1907

InventorThomas Claude Durham

LanguageEnglish

Only the amended version

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A PDF version of the original patent can be found here.

AMENDED SPECIFICATION.
Reprinted as amended in accordance with the decision of the Supervising Examiner acting for the Comptroller-General, dated the 19th day of June 1908.
N° 12,730 A.D. 1907
Date of Application, 1st June, 1907—Accepted, 5th Dec., 1907 COMPLETE SPECIFICATION (AMENDED). Improvements in Razors

I, Thomas Claude Durham, of 111 Fifth Avenue, New York, United States of America, Cashier, 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 an improvement in razors, and aims to provide a simple and efficient device in which a thin, replaceable blade may be used and which is readily convertible from a device of the “safety.” type to one of the exposed blade type, the manner of operating the device in both instances being the same as that of an ordinary razor.

The thin blade employed in this invention has sufficient rigidity to render it operative for shaving without being supported near its cutting edge.

A full understanding of the invention can best be given by a detailed description of a preferred construction embodying the various features of the invention, and such a description will now be given in connection with the accompanying drawings which show such a preferred construction.

In the drawings:

Figure 1 is a plan view, partly in section, of a device constructed in accordance with the invention;

Figure 2 is a side elevation of the structure shown in Figure 1;

Figure 3 is an enlarged sectional elevation taken on the line 3—3 in Figure 2;

Figure 4 is a side elevation of a part of the structure shown in Figures 1 and 2 with certain parts removed and others substituted;

Figure 5 is an enlarged sectional elevation taken on the line 5—5 in Figure 4;

Figure 6 is a detail view of a blade adapted for use in connection with the structure shown in Figure 1;

Figure 7 is a detail sectional view of a modification of the structure shown in Figure 1;

Figure 8 is a side elevation of the structure shown in Figure 7;

Figure 9 is an enlarged sectional elevation taken on the line 9—9 in Figure 8;

Figure 10 is a detail view of a blade adapted for use in connection with the structure shown in Figure 7;

Figure 11 is a detail sectional view of another modification of the structure shown in Figure 1;

Figure 12 is a side elevation of the structure shown in Figure 11;

Figure 13 is an enlarged sectional elevation taken on the line 13—13 in Figure 12; and

Figure 14 is a detail view of a blade adapted for use in connection with the structure shown in Figure 11.

In carrying the invention into effect, there may be provided a thin blade 1 having two cutting edges 22. The blade 1 is flat and although thin is of sufficient thickness to retain the cutting edges in a straight line, thus avoiding the curling of the edges when an excessively thin blade is used.

There may be employed a supporting member or support 3 which is narrower than the blade and which extends throughout its length. A shank 4 may be extended from one end of the support and this shank may be pivoted at 5 to a handle 6 of the usual type. For the purpose of equalizing the weight and balancing the device the shank may lie in planes coincident with the planes of the blade, as is clearly shown in Figure 1.

A clamping member or clamp 7 may be employed for securing the blade in position between it and the support, and this clamp may be narrower than the blade and extend throughout its length. One of the members may be provided with means engaging the other member and have a sliding movement thereon to lock the blade in position. This movement may be a longitudinal movement and the engaging means may be carried by the clamp, 7, as has been previously proposed. A headed stud 8 or the like may be provided, the stud being fast to the clamp 7 and arranged to engage a countersunk shouldered slot 9 in the support 3 before referred to, the shoulder being cut away at one end of the slot so that the stud may be withdrawn from the support. It will be seen that the locking means is located between the exterior of the support and the exterior of the clamp. The particular object of this construction will appear hereinafter.

The blade 1 is provided with perforations 10 and 11, the perforation 10 being so located that the headed stud 8 will pass through it and into the slot 9 before referred to.

Means may be provided for positioning the blade on the clamp comprising a plurality of studs 12 arranged to pass through the perforations 11 in the blade and project beyond the face thereof so that when the blade and clamp are placed in position on the support the studs 12 will engage slots 13 cut in the support 3 and prevent turning of the blade. If desired, one of the members may be magnetized to retain the blade in position, so that when the parts are separated for the purpose of changing the blades, the blade to be removed will not fall off.

Means are provided for protecting one edge of the blade when the other is to be exposed for use as in an ordinary razor. A modified form of clamp may be used for this purpose which is provided with an extension 14 projected from one side of the clamp 7, the edge of the extension being ribbed at 15, the rib extending over the edge of the blade.

The device may be provided with means whereby it is converted into a razor of the “safety” type. For this purpose the clamp 7 may be provided with a series of teeth 16 projecting from both, sides of the clamp and extending beyond the edges of the blade. These teeth do not contact with the cutting edges so that it is possible to obtain, in the use of the device, a diagonal cutting action exactly like that of an ordinary razor.

It will be readily understood that owing to the fact that the locking means is located between the exterior of the support and of the clamp, the blade may be stropped as an ordinary razor, the rib 15 protecting the edge of the blade not being sharpened.

Ribs 17 may be formed on the end teeth of the guard for the purpose of protecting the face from the corners of the blade, the ribs being bent to intersect the planes of the blade as is clearly shown in Figures 2 and 3.

A recess 18 may be formed in the end of the clamp 7, its purpose being to permit the insertion of a finger to lift the blade from the clamp.

Figures 7 to 10 inclusive illustrate a modified form of locking device in which 22 indicates a support similar to that shown in Figure 1 except that it is provided with two slots 27 for the reception of the headed studs 26 mounted on a clamp 24, this clamp being also provided with two-studs 2525 arranged to engage the perforations 2121 in a blade 19 having two cutting edges 2020. The support 24 has extended from one end thereof a shank 23 which may be pivoted to a handle similar to that shown in Figure 1.

Figures 11 to 14 inclusive illustrate another form of locking means in which 28 indicates a blade having two cutting edges 2929 and an elongated aperture 30. A support 31 is provided with a shank 32 and an elongated dovetail slot 36 in which is slidably fitted a boss 34 formed on a clamp 33, the boss 34 engaging the aperture 30 in the blade to prevent turning of the blade and projecting beyond to engage the slot 36.

From the foregoing description, it will be seen that the device may be used as an exposed blade device capable of use in the same manner as an ordinary razor or as a “safety” device producing a diagonal cut and capable of use on either side of the face without shifting of the guard, that a new sharp blade may be readily substituted for an old dull one, and that an old blade may be sharpened in the device if so desired.

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 razor in which a thin detachable blade is positioned on a support or clamp, the support or clamp being magnetized to retain the blade in position.

2. A razor in which a thin detachable blade is positioned between a supporting member and a clamping member, one of the members being provided with means passing through the blade and engaging the other member and having a sliding movement thereon to lock the blade in position.

3. A razor in which a thin detachable blade is positioned between a support and a clamp, the clamp being provided with means for positioning the blade and with means passing through the blade and engaging the support and having a sliding movement thereon to lock the blade in position.

4. A razor in which a thin detachable blade is positioned between a support and a clamp, the support having a shank extended from one end thereof and lying in planes coincident with the planes of the blade to balance the device.

5. A razor in which a thin detachable blade is positioned between a support and a clamp, the clamp being provided with a headed stud or the like engaging the support and having a longitudinal sliding movement thereon to lock the blade in position.

6. A razor in which a thin double-edged detachable blade is positioned between a supporting member and a clamping member, one of the members being provided with means engaging the other member and having a sliding movement thereon to lock the blade in position, and one of the members being provided with a double safety guard co-operating with the blade.

7. A razor in which a thin detachable blade is positioned between a supporting member and a clamping member, the locking means being located between the exterior of the supporting member and the exterior of the clamping member.

8. A thin razor blade provided with an elongated aperture by means of which it may be positioned and secured to a holder.


Dated this 1st day of June 1907.

CARPMAEL & Co.,

Agents for Applicant,

24 Southampton Buildings, London W.C.