US953989A - Safety-razor. - Google Patents

Description

T 0. DURHAM; SAFETY RAZOR. APPLICATION FILED JAN. 7, 1910.

Patented Apr. 5, 1910,

UNITED simtrns '1 A *T QF-E .coivirANY. or New Yoi x, N. Y,,- A CORPORATION, or NEwIY'oRKI shun-gazes Original application filed March 8, 1909, Serial-No. 482,148.f Divided iit is applic fi ed January'7, 4910. Serial message. I y

To all whom it may concern." I

Be it known-that I, Tiioii'as G. DURHAM, a citizen of the United States, residing at New York, county of New York, and State of New York, have invented a new and useful Iinprdveiuent in Safety-Razors, of which the following is a specification.

This invention relates to an improvement in safety razors of the'ty e disclosed in my co-pending application fi ed March 8, 1909,

.Serial N o. 482,143, of which this application is a division, and one of the objects thereof is to provide a device of this character in which the guard will not interfere with the rte-sharpening or stropping of the blade.

A further object is to provide a device in t ' nary type.

With these and other objects not specifically mentioned in view, the invention consists in certain constructions and combinationswhich will be hereinafter fully. de-

scribedand then specifically dpointed out in the claims herei'into appende In the accompanying drawings, which! form a part of this s ecification and in which like characters 0 reference indicate the same parts, Figure 1 illustrates a: device constructed in accordance with the invention, Fig. 2 is a detail view of the safety guard 'used in connection with the structure shown in Fig. 1, and Fig. 3 is an enlarged sectional view on the line 3-3 in Fig. 1.

Iii-carrying the invention into effect, there is provided a blade and a. cooperating safety uard, both ofwhich may vai within wide imits. In the device selecte the invention, there is provided a' blade 1 mounted in a conventional handle 2 and havin a thick back'3 and a cutting edge 4 both included within a prism the apex of which is the cutting 'edge and the base of which includes the back 3 of the blade, this prism being. determined by the iiiitial shapmg or shar ening of the blade. This prism is indicat in Fig. 3 by the broken line Itis well known in the trade that razor blades are ground so that what is termed 'the angular faces of the edge of the blade;

that is to say, the sides of the blades adjacent the cutting edge the planes of which intersect at the line of the edge, form a verysmall included angle found in many years simpxle and eiiicient and which may housed to illustrate In or er'to maiiitainthe higli THOMAS-C. DURHAM. or new Yoaic N. Y.,'" i ssioiioa 'ro nu'iiriaiinormx imzo i' i f at- "l ateiit' afar :15, 1910.1.

the device, whei'i ;it becomes nec.- saiy -to reg sharpen the blade, it isi npoiftant thati th'ej includedangle of the faces, or the initial-f prismatic shape of the blade asawh'ole, be:

preserved, for. if the blade is re-sliarpenedj in such. amannei'f tiatf a wider angle is; formed adjacent the utting edge the ed o will be blunterand lesd'eflicient, and if t e blade is re-sharpened in such amanner as to. make the thin edge of the blade still thinner the edge will lose its rigidity and become too flexible. In the present invention, the structure em'- loyed is ofsuch a character that the bla e may re sharpened at its initial angle and without alteringits initial prismatic shape upon which its etficiency depends.

There is provided a safety guardbeyond the edged the blade which cooperates with the blade. \Vhilein'c'ertain constructions thisguard' may be otherwise formed, in the b'est constructions and as shown,- a corrugated guard '6 is employed, this guard having upturned ends 7 pivoted at 8 to the blade 1 One 'of the upturned ends of the guard isprovided with a stop-9 limitingthe swinging movement ofthe guard across the edge of the blade. 3

It will .be readily understood that with the structure illustrated-the blade may bestropped or otherwise re-sharpend in the .usual manner without removing the guard, since the latteris free to swing from one side of the blade to the otheracross its ed 'e, the swingi'ig movement being limited by t e stop 9 and that in applying'tl e device to the face the guard will "be automatically swung" by contact with the face to its cbrrectv position with respect to the cutting-edge of the blade, whichever side may be presented to the face.-

Changes and variations may be made in the structure by means of which the invention is carried into effect. I The jnvention, therefore, is not to be restrictedi to the' precise details of the structure shown unddescribed. a \Vhat is claimedis:

1. A safety razor comprising a blade having a thick back and a cutting edge both ineluded within a prism the apex of: which is the cutting edge and the base of which inbe ng determined by the initial eludes the buck of-jthe'blade this prism shaping of the blade. and a guard beyond the cutting edge of the blade and pivotally connected with th'c blade; whereby-the blade may be sharpened at its initial angle with the guard in position, substaiitially as described.

2. A safety razorcomprising a blade hav ing a thick back and acutting ed e both included within a prism the apex 0 which is thc1cutt-ing)edge-and the base of which includes. the being determined by the initial shaping of the blade; and a guard beyond the cutting edge of the blade and having upturned ends pivoted to the blade, whereby the blade may e sharpened at its initial angle with the guard in position, substantially as described.

3. A safety razor comprising a blade havack of the blade, this prism the cutting edge of the bladeand having upturned ends pivoted tot-he blade, whereby a the blade may be sharpened at its initial tia ly as described.

In testiinony whereof, I have signed my.

name to this specification in the presence of two subscribing witnesses.

THOMAS CQDURHAM.

\Vitnesses I G. P; STACY,

SYDNEY I. Puasoo'rr;

an le with the guard inposit-ion, substan-

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