US2078799A - Razor strop - Google Patents

Description

Apu-il 27, 1937.. K'HUMMELJIR RAZOR'STROP Filed March 4, 1956 INVENTUM @d JWM Patented Apr. 2'7, 1937 FFME RAZOR STROP Karl Hummel, Jr., Karlsruhe, Baden, Germany Application March 4, 1936, Serial No. 67,040 In Germany November 3, 1934 2 Claims.

For setting razors a plane or a convex or a concave setting surface is required according to the width and the concavity of the razors and to the condition of their cutting edge. I-Iitherto it was necessary therefore to have at hand always three or at least two raZor-strops having different setting surfaces. Now, the object of my invention is a razor-strop which is provided with a device by means of which it is possible to give its setting surfaces one or the other of the said three shapes according to requirement, so that always but one razor-strop has to be at hand.

My invention is illustrated by way of example in the accompanying drawing in which Fig. 1 shows a whole razor-strop according to my invention partly in side elevation and partly in longitudinal section on the line l-I of Figure 2,

Fig. 2 shows the upper part of this razor-strop in longitudinal section on the line 2--2 of Figure 3,

Fig. 3 is a cross-sectional plan view taken on the line 3--3 of Figure l, and

Fig. 4 shows the lower part of the handle of this razor-strop cut away in Figure l in longitudinal section. n v

`Each of the two leather-straps a lies on a flexible strip b of wood or other suitable material. And between these two strips' and parallelly to the saine a tube c extends which may be of light metal, artiiicial material such as Bakelite, or other suitable material and which is composed of two equal parts. Each of these parts is at one end provided with a flange d, and both parts are connected together by screws e passing through both flanges, while each part at the other end carries a rectangular plate f lying at right angles to the tube c and having two flanges g. These iianges extend on both sides of and parallelly to the tube and eachA flange terminates in a joint-part h. To each end of the strips b two joint-parts z' are screwed which are connected together by one of their two iianges and to the adjacent joint-part h by a joint-pin k passing through them. The other ange of each joint-part i is in the form of a shoe in which one end of the respective strip b sticks. The ends of the straps a are bent around and riveted to those of the strips b and to the shoe-shaped ilange of the parts i.

To the middle part and on the inside of each strip b a plate l is screwed which has an arm 'nz extending inwards and rectangularly to said plate and forming a rack. Both racks are guided on both sides of the tube c in corresponding recesses of the flanges d and gear into a pinion n lying in further recesses of the flanges. This pinion is fixed on the square upper end of a spindle o which is rotatably mounted in the lower part of the tube c and carries below the lower plate f the handle p. The lower part of the latter (see Figure 4) has an enlarged boring, and on the lower part of the spindle o a collar q, two nuts 1' and a helical spring s are mounted; the latter presses the handle p close to the lower plate f.

. A bush t (Fig. l) is xed in the upper end of the handle, 'while a pin u sticks in the spindle o; this pin engages by its ends in two longitudinal notches of the bush t and thereby couples the spindle with the handle in such manner that the latter is slidable on the former longitudinally. The bush t has a nose o which engages in a hole of the lower plate f; thereby the handle p together with the spindle o and the pinion n are secured against rotation in one or the other direction and the racks m together with the plates Z are secured against moving outwards or inwards, so that the strips b together with the straps a retain the even shape.

If, however, the handle p is pulled down, so that the nose o disengages from the lower plate f, the handle p together with the spindle o and the pinion n can be rotated in one or the other direction. In the rotation of these parts the pinion n moves the racks m together with the plates Z outwards or inwards, whereby the strips b together with the straps a are bent correspondingly and thus the two setting surfaces are curved convexly or concavely respectively, as indicated by broken lines in Figure l. If now the spring s is allowed to press again the handle p close to the lower plate f, the nose o engages another hole of this plate; thereby the parts Z, m, n, o and p are secured against moving back, so that the strips b and the straps a retain the curved shape.

What I claim as my invention and desire to secure by Letters Patent is:

l. In a razor-strop the combination of a rotatable handle, a tube provided with plates at both ends, said plates lying at right angles to said tube, two liexible strips hinged at each end to one of said plates, two straps of leather or the like lying on the outer side of said exible 10 provided with a ilange at the inner end, said flange having three recesses, two flexible strips hinged at each end to one of said plates, two straps of leather or the like lying on the outer side of said flexible strips, means for simultaneously giving said two flexible strips and said two straps either a plane or a concave or a convex shape according to requirement, said means comprising a spindle rotatably mounted in said tube and connected to said handle, a pinion fixed on said spindle and rotatably mounted in one of said recesses of each of said parts and two racks each connected to one of said flexible strips and guided on one side of said tube in one of said recesses of each of said parts and each engaging from one side into said pinion, and means for securing said spindle against rotation.

KARL HUMMEL, JR.

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