Patent GB-374449-A (GB)
Title: Improvements in and relating to razor blades
IPC: B26B21/50
Filed: 1930-12-09
Abstract: 374,449. Safety razors. DE HAVEN RAZOR CORPORATION, 405, Lexington Avenue, New York, U.S.A. Dec. 9, 1930, No. 9547/32. Convention date, Dec. 9, 1929. Divided on 371,005. [Class 30.] The rigid backing 29 of a single-edged flexible razor blade is formed with two rearwardly projecting seating points 42, Fig. 6, which contact with the holder to prevent the blade rocking and position it relatively to the guard. The razor includes sharpening means which are described in Specification 371,005. The blade is spaced from the backing and is connected to it at spaced points by arms 30 which have inwardly pressed projections 71 engaging larger apertures in the blade to permit a slight play of the blade in its backing. The razor may have a fixed or an adjustable guard and in the former case the arms 30 also grip the blade frictionally. to allow it to be pushed backwards or forwards to adjust it. The backing 29 is formed with a ,ridge 34 and is thickest at its centre, tapering transversely towards its ends to facilitate sliding it longitudinally into the holder from the side. The projecting seating points 42 are formed by narrowing the backing at its centre and ends. The blade holder, Fig. 12, is formed from a single piece of spring metal having an embossed lip 32 which engages the backing ridge 34 and coacts with a tongue 35, struck from the opposing face 31, to grip the thickened centre of the backing 29. The holder has bearing parts 43, 46, 48 embracing a square-ended rod 44 non-rotatably carried in side faces 6 which form a continuation of the bifurcated handle parts 4. The rod 44 has a flat 50 which, in the shaving position, Fig. 4, presses the blade on to the guard through the forward edge 47 and surface 48 of the holder, and in the raised position, Fig. 10, into which the holder is moved by a finger 51, it retains the blade by pressing on the flat surfaces 43, which internally bear on the raised seating points 42 of the blade backing. The guard 9 has a central pivotal mounting 18 on a stem 10 to allow it to assume the correct shaving position. In the form shown in Figs. 4 and 10, the guard is transversely adjustable by rotating a screwed sleeve 17 engaging a tab 15 carried by the guard and fitting loosely between ears 14 on the stem 10. Unscrewing the pivot pin 18 and withdrawal of the sleeve 17 allows complete removal of the guard. In a modification, also shown, a non- adjustable guard has downwardly extending ears embracing a tab on the member 10 and retained thereon by a plain screw-ended pivot pin. In this form the guard is aligned in the handle by depending wings embracing horizontal limbs 5 which form part of the bifurcated handle. In that shown in Figs. 4 and 10 the guard is aligned by the lower end of the stem 10 which fits tightly and cannot twist in the handle. A sharpening element 7 is attached to the guard, and the stem 10, carrying it, has a bifurcated end 77 mounted on a flat-sided pivot pin 76 carried by the handle parts. By shaking the razor the stem 10 is oscillated on the pin 76 to cause the sharpening element 7 to reciprocate in contact with the blade edge. A shouldered stop-pin 21 and co operating wings 12, 13 on the stem 10 and handle 4 limit movement of the stem between the positions shown in Figs. 4 and 10. The bar 44 is retained in the side faces 6 by their spring action alone or the ends of the bar may be riveted over. A knurled gripping block 73 is provided at the end of the handle. The Specification as open to inspection under Sect. 91 (3) (a) contains also the matter of Specification 371,005 relating to forms of sharpening elements. This subject-matter does not appear in the Specification as accepted.