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Multiplex Razor (‘Mvltiplex’)

Patent US1920711

Invention Safety Razor

Filed Friday, 1st November 1929

Published Tuesday, 1st August 1933

Inventor Mino Pelizzola

Language English

Multi-blade razors are not a recent invention.
‘Multiplex’ or ‘Mvltiplex’? It's of course called ‘Multiplex’, but written in a font where the ‘U’ looks like a ‘V’ (inspired by ancient Rome).

CPC Classification:   
  • B26B21/22
    Safety razors with one or more blades arranged transversely to the handle involving several blades to be used simultaneously
  • B
    Performing Operations; Transporting
  • B26
    Hand Cutting Tools; Cutting; Severing
  • B26B
    Hand-Held Cutting Tools Not Otherwise Provided For
  • B26B21/00
    Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor
  • B26B21/08
    Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor involving changeable blades
  • B26B21/14
    Safety razors with one or more blades arranged transversely to the handle

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

Patented Aug 1, 1933 1,920,711
United States Patent Office

1,920,711 Safety Razor Mino Pelizzola, Milan, Italy Application November 1, 1929. Serial No. 404,180,
and in Italy November 8, 1928
2 Claims. (Cl. 30—12)

The present invention relates to a multiblade safety razor.

The novel razor is essentially distinguished by the fact that it comprises at least two blades carried by supporting means adapted to maintain their cutting edges in parallel and stepped relationship to each other.

This characteristic arrangement offers the advantage that the shaving can be performed more quickly and more regularly, since the hair is cut by the various cutting edges in succession, the first edge effecting a coarse shaving and the following edges effecting a closer shaving. Moreover the angle of incidence made by the cutting edges with the skin, once the most convenient angle has been established, the blades can be permanently fixed with their edges at that angle.

The razor according to the invention is illustrated, by way of example only, in the accompanying drawing in a preferred embodiment of the invention.

Fig. 1 is a partial longitudinal elevation at a conveniently enlarged scale of the preferred embodiment of the invention, the blade part being shown in cross section along 1—1 in Fig. 2.

Fig. 2 is a top plan view looking in the direction indicated by the arrows 2—2 in Fig. 1.

Figs. 3 and 4 respectively show the safety plate in plan, and in cross section along 4—4 in Fig. 3.

Figs. 5 and 6 are similar views of a spacing plate.

Fig. 7 shows a blade particularly adapted for use in connection with the razor.

Fig. 8 shows an ordinary safety razor blade which has been slightly modified for use in the razor according to the invention.

Fig. 9 is a view similar to Fig. 1, showing a second modification of the invention.

In the first form of the invention (Figs. 1 to 8) the blades which are, for instance five in number viz. 1, 2, 3, 4, 5, are alternately arranged with the spacing plates 6, 7, 8, 9, 10, the resulting arrangement being clamped between two locking blocks 11 and 12. The block 12 is fixed to the razor handle 13, and means are provided for clamping the block 11 to the block 12 to provide a casing for the assembled parts.

The clamping means are of detachable type and comprise two pins 14, one end of which is fixed to the locking block 11; the two pins are inserted into the holes 15, 16, 17 provided respectively in the blades spacing plates and locking block 12. Each pin projects past the hole 17 and is screw-threaded for reception of a nut 18.

As will be seen from the drawing, the pins 14 are set at substantially right angles to the blades as well as to the spacing plates and to the plane surfaces of the blocks 11 and 12, so that owing to the gradually increasing distance of the holes 15 and 16 from the longitudinal edges of the successive blades and plates, the characteristic stepped arrangement of the cutting edges 19 of the blades is obtained.

In this embodiment of the invention, the base plate 6 (see also Figs. 3 and 4) is provided with safety teeth 20; the spacing plates 7, 8, 9, 10 (see also Figs. 5 and 6) show a recess 21 at their edge near the cutting edge of the blades, so as to leave the cutting edge free except at its two ends. It is obvious, however, that also the spacing plates might be fitted with safety teeth instead of the recessed edge. In order to leave the cutting edge free, the teeth 20 have a recess or cut-away portion 21′.

The blades 1, 3, 5 are advantageously provided with six holes 15 (three for each pin 14), whereas the blades 2 and 4 have only two pairs of holes 15. With this provision the object is reached that the cutting edges can be set in stepped relationship to one another by threading each blade on the pins 14 by a convenient pair of their holes 15, for instance the blade 1 having three hole-pairs by the hole-pair that is farthest away from the cutting edge, the blade 2 (having two hole-pairs) by the hole-pair which is farthest away from the cutting edge, the blade 3 (having three hole-pairs) by the center hole-pair, and so on.

It should be noticed that, as each blade is firmly held between two plates, the blades are not flexed and can accordingly be manufactured with fully hardened steel so that the edges may be quite sharp and have a long life.

It is obvious that in combination with the razor according to the invention, also blades of ordinary safety razor types (for instance Gillette) can be used. To this effect it will suffice (Fig. 8) to form holes 15a, in such blades so as to enable them to be threaded on the above said connection means.

In the modified construction illustrated by Fig. 9 the pins 14b are inclined relatively to the blades. Accordingly all the holes 16b of the plates 6b, 7b, etc. may be formed in the same center position; the same applies to the holes 15b of the blades. For instance the blade holes may be arranged in the same manner as in the ordinary Gillette blades so as to allow of their interchangeability. As will be gathered from the drawing, the plate holes 16b are inclined relatively to the plate surfaces.

In order to avoid the necessity of taking the razor parts asunder after use, the razor blades are advantageously coated with a layer of enamel, varnish or the like, the cutting edge alone being left free. After use, it will then suffice to rinse the razor in water preferably hot and to wipe the cutting edges with a dry cloth, and the rest of the razor will not be liable to rust or any other alteration.

When the blade edge has worn out on one side (the which occurs after numerous shavings) one can disassemble the razor parts and re-sharpen the cutting edges.

Numerous variations may be devised of the present invention. For instance, the blades instead of being laid flat might receive a certain curvature on their being mounted in the razor. The clamping and spacing means might be of a different type. The assembled cutting edges, instead of being arranged in a plane surface, might be arranged to form a somewhat curved surface, and so on without departing from the spirit and scope of the invention.

Having now described my invention and how the same is to be carried out, what I claim as my invention is:

1. A safety razor comprising a lower block having a handle fixed thereto, an upper block having pins fixed thereto, said pins being passable through apertures in the lower block, a plurality of cutting blades between the blocks and having cutting edges upon their longitudinal edges, said blades being of the same width, said blades having a plurality of transversely alined holes therein, plates between the blades having openings therein through which the pins are passable, said pins being adapted to selectively engage the holes of the blades to maintain the cutting blades in stepped parallel relation, and a clamping nut engaged with the pins and bearing against the lower block to hold the blades and plates clamped between the blocks.

2. A safety razor comprising a pair of blocks, a handle fixed to one block, blades having the same width and arranged in a plane between the blocks, flat spacing plates between the blades and being in intimate contact therewith throughout their width, the said blades, blocks and plates being disposed in inclined relation with respect to the longitudinal axis of the handle, each blade having a cutting edge on its longitudinal sides and clamping means cooperating with the blocks for holding the longitudinal edges of the blocks, blades and plates in stepped relationship and the cutting edges of the blades in the same parallel plane.

Mino Pelizzola.