US1833954A - Shaving machine - Google Patents

Description

Dec; 1, 19 1. scmcK 1,833,954

SHAVING MACHINE Filed Oct. 8, 1928 #1 U i BY Patented Dec. 1, 1931 UNITED STATES- PATENT OFFICE JACOB SCHICK, OF STANFORD, CONNECTICUT, ASSIGNOR TO SCEICK DRY SHAVER, INC., 01 STAMFORD, CONNECTICUT, A CORPORATION OF DELAWARE SHA'V'ING MAC-KIN E Application filed October 8 1928. Serial No. 811,028.

a This invention relates to an improved shaving machine which is adapted to shave hair from the skin without possibility of cutting the skin and do so without the necessity of lathering the skin.

To this end the invention is constructed to nestle into the beard or hair and to be moved back and forth on the skin and not held up by stubble or turned over hairs, this by reason of open-ended slots which form the side edges of blades, the shaving head having said blades projecting laterally to one or both sides, the latter being preferred.

The invention also comprises a cutter or cutters operating with teeth sliding on the inner faces ofthe blades of the shaving head, the teeth of the cutter having openings between them to allow hair that is cut to fall through the cutter and therefore not accumulate to interfere in any way .with the operation of the machine and to keep itclear hair andthus keep it clean.

The invention also resides in certain details of construction which will be hereinafter more fully described and finally embodied in the claims.

The invention is illustrated in the accompanying drawings, in which Figurel is a side view of a machine embodying my invention and Figure 2 is an end view thereof.

Figure 3 is a perspective view of the shaving 1 head and Figure 4 is an enlarged view oftwo adjoining blades to more clearly show their construction. Figure '5 is a bottom view of the head shown in Figure 3 and Figure 6 is a perspective view of a cutter.

This machine could be made, of course, with one laterally projecting cutter or shaving part but for symmetry, balance and area of surface to be covered I prefer to make it with two. such cutting portions.

The drawings shows a cutting or'shaving i head which is formed of a plate or rib 10 which has two projecting sets of blades 11 and 12.

The "cutters 13 fit in the sides of this T- shaped shaving head,the cutters having teeth 14 which slide on the under sides of the blades 11 and 12 and thus sever the hairs which pass into the slots 15 between the blades 11 on one side and the blades 12 on the other side. I

The blades 11 and 12 are cut by slotting across the projecting parts of the shaving head and across the top of the rib 10, thus forming an open-ended continuous slot between two adjacent blades. The slots when tapered are formed by cutting with a milling tool that is tapered with its side edges at an angle. I find a cutter with sides arranged at an angle of about 130 degrees well adapted for the purpose. This will be evident from Figure 4, the blades thus formed being triangular in cross-section. These areblunted slightly by bufling as at 16 which is necessarily exaggerated in thedrawing.

The blades are rounded or pointed at the ends, shown at 17 this being done so that hairs curled,over close to the skin are picked up and directed into the slots between the blades as the machine traverses the face with the blades 11 and 12 resting against the skin.

In illustrating the invention the relative thickness of the parts is exaggerated. In practice the slots 15 are minute, being usually .008 of an inch in width. The blades 11 and 12 are about .037 of an inch in width and about .007 of an inch in thickness. These triangular blades with their inclined sides are very thin and provide for a rapid and close-shave as the skin passes up into the slots 15 to enable the hairs to be cut oil? close to the skin but not to an extent to cut the skin or even irritate it. I find it desirable in some instances to make theteeth 11 and 12 triangular in cross-section and when so made the bottom is slightly rubbed down as at 16;

The blades 11 and 12 are very thin and are too thin to withstand shaving pressure w'thout flexing. The teeth 14' of the cu ters. therefore have an additional function in that cutters. The lever 18 can be reciprocated by an eccentric 20 on shaft 21 which can be connected to a flexible shaft (not shown) which has a fixture to enter the recess 22.

Ofcourse the particular means of driving the cutters is not essential as difierent forms of motors may be employed.-

The whole device is supported in a suitable handle 23 which is preferably made of generally flat form for preventing its turning in the hand and to 1provide space for any means that are insta led for operating the cutters. I

The open-ended slots 15 which separate the blades 11 on one side and the blades 12 on the other side are cut clear across to slot the end of the rib 10 and the device can therefore lie down among the hairs close to the skin while the machine is passed back and forth to sever all the hairs and perform a complete and close shave.

The blades 11 and 12 project but a short distance on each side of the shaving head as the cutting takes place as soon as the hair is engaged by the teeth 14. Thisv is due to the high speed of the cutters 13 which.

successfully operate at a speed of about thirty-three hundred (3300) reciprocations per minute.

The blades 11 and 12 extend beyond the teeth 14 and this extension not only alines the hairs for entry into the slots but also prevents the skin from entering the ends of the slot to be cut or irritated by the ends of the teeth 14.

Many experiments have been made to evolve the most successful type and most advantageous proportion of parts. I find in practice that the blades 11 and 12 separated by slots .008 of an inch wide prevents more than two hairs being abreast in an slot and the strain on the cutters is there ore minimized but the high speed of the cutters facilitates the shaving. The blades 11 and 12 are extended from the rib 10 about .055 of an inch and the teeth 14 on the under side of these blades extend, say, .025 of an inch. This gives the proper extension of the blades 11 and 12 beyond the ends of the cutter teeth 14 for guarding the skin and for lifting curled or inclined hairs before they are engaged by the cutters 14.

This machine as used has therefore established a successful shaving machine, as differentiated from a hair clipper, as this machine has blades on the face plate about .007 of an inch thick and separated by a-space of about this thickness.-

The teeth 14 form a co'nstant support by either making them wider than the slots 15 or arranging them at a slight angle relative to the slots to form an oblique cuttin surface relative to the edges of the bla es 11 and 12.

Various changes may be made in the ina- 1,ess,954

The construction of this machine is an im-' provement in that the hairs that have been cut off pass through the open slots between the blades and between the teeth into the clear space underneath the laterally projecting teeth and the device is thus kept clean and there is no accumulation of hair to interfere with its operation.

I claim 1. A shaving machine comprising a base with a T-shaped projection, the lateral arms and the top of the upright part of the T being slotted to form blades on said arms, andcutters fitting into the sides of the T and under the arms, the parts of thecutters under the arms being slotted to form teeth and termiblades supported at the centre and projecting laterally, the blades being of extreme thinness and separated by minute slots and projecting a short distance from the central support, and cutters operable under the blades and shorter than the blades and supporting them against flexing.

3. A shaving machine comprising a set of blades supported at the centre and projecting laterally, the blades being of extreme thinness and separated by minute slots and projecting a short distance from the central support, and

.cutters operable under the blades and shorter than the blades and supporting them against flexing, the blades having their ends pointed to direct hairs into the spaces between the blades.

4. A shaving machine comprising blades spaced from end to end and being approximately .007 inches thick and spaced apart by .008 inches, the blades projecting laterally, a support for the blades at the centre, the edges of adjoining blades being tapered, the planes of said adjoining tapered portions being arranged at an angle of 130 degrees to each other, the blades being approximately .055

inches long, and cutter teeth operable under said blades and of less length than said blades thereby terminating short of the ends of said blades. j 5. A shaving machine comprising a head including a support and laterally extending thin, flexible blades relatively long and separated by thin slots, and a cutter having teeth extending under the blades and engaging the blades at all timestohold themagainst flexing and to co-operate therewith when moved laterally of the blades of the head to cut hair. In testimony whereof I aflix my signature.

. JACOB SCHICK.

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