US1338305A

US1338305A - Rotary cutting device for razors

Info

Publication number: US1338305A
Application number: US267251A
Authority: US
Inventors: Sidney P Jones
Original assignee: Individual
Current assignee: Individual
Priority date: 1918-12-18
Filing date: 1918-12-18
Publication date: 1920-04-27
Anticipated expiration: 1937-04-27

Description

S. P. JONES.

ROTARY CUTTING DEVICE FOR RAzoRs.

APPLICATION FILED DEC. I8, 1918.y

Patented Apr. 27,

Mbna! Il 40 ing SIDNEY I. JONES, oE wAco, TEXAS.

EOTAEY CUTTING DEVICE Eon EAzoEs.

Specification of Letters Patent. Patented Apr. 27, 1920,

Application filed December 18, 1918.' Serial No. 267,251.'

To all whom t may concern:

Be it known that I, SIDNEY I. JONES, a citizen of the United States, residing at Waco, in the county of McLennan and State of Texas, have invented certain new and useful Improvements in Rotary Cutting Devices for Razors, of which the following is a specification. I

This invention relates to lcutting devices for mechanical razors andparticularly to improvements in rotary cutting devices.

In experimenting with the construction of a cutting device to be used in connection with a shaving guard having openings through which the cutting edges of the device are exposed I have discovered certain facts which led me to make particular improvements in order to gain the most efficient and satisfactory results. I

discovered that certain features were absolutely essential in the structure of such a device and without them the cutting device was neither safe nor efficient.

By actual tests I found that the cutting edges ofthe blades must only project from the surface of the cutting memberjto a limited degree and .the surface of the cutting member must support the skin of the .face on each side of the cutting edge, otherwise the cutting edge would cut the Skin which protruded into its path. In carrying out the invention it is best to have a substantially smooth surface with a limited portion `of the cutting edge of each blade exposed on the surface of the cutting'member. T his gives a smooth shaving operation, whereas the cutting blade which has no support for the flesh on each side of the cutting edge will give a choppy and unsatisfactory shavoperation.y v

n afmore specific' embodiment of the invention a `rotatable cutting member is provided. 'Ihe member is formed with longitudinal lather accumulating pockets having their open sides bridged by ribs forming part of the surface ofthe member or an equivalent structure. Gage="'plates are removably fastened on the member between the ribbed panels and have their outer surfaces'made smooth so as to form part of the surface of the cutting device in har- 'mony with the smooth outer surfaces of the ribs. When the gage plates are in position the cutting device may have a substantially circular surface, but this is not absolutely necessary and may be varied.

The gage plates hold in place and cover the greater portions of the cutting blades which have their cutting edges projecting from each'longitudinal edge of each gage plate. The cutting edges are directed toward the ribbed panels and overhang the edges of the pockets. Grooves or channels are formed immediately under the cutting edges so as to give clearance and prevent an accumulation of lather or other sediment. 'Ihe cutting edges have only a limited projection and may `terminate leither slightly above or below the supporting surface of the device which is formed by the ribbed panels and gage plates. By making the gage plates or the cutting blades easily removable said blades may be sharpened or replaced.

The invention will be more readily understood from a reading of the following specification and by reference to the accompanying drawings, in which an example of the invention is illustrated, and wherein,

Figure l is a view of a rotary razor equipped with a cutting device constructed in accordance with this invention.

i Fig. Q is a partial elevation showing the device applied to a razor with a guard,

Fig. 3 is a plan View of thesame,

Fig. 4 is a detail of the cutting device,

Fig. 5 is a cross sectional detail on the line 54-5 of Fig. 4,

Fig. 6 is a vertical sectional detail on the line 6-6 of Fig. 5,

Fig. 7 is a detail of ,a modified form of cutting device, and

Fig. 8 is a perspective view of onev of the gage plates.

In the drawings the numeral 1 desig-l nates a handle .member'ha'ving a fiat head 2 of larger diameter. On the head the base 3 of a shaving guard structure 4 is secured. I haye not shown the guard offset from the handle as in my co-pending application filed of even date herewith, although the off-set.- construction is more advantageous `and preferable. The guard structure com- 'to the surface of the cylinder bridge the entrance to each pocket. Between each row of ribs the cylinder is reduced .in diameter to form seats for cutting blades 12; Each blade is clamped in place by a gage plate j 13. The gage plates have their outer sur faces smooth, and conforming to the same arc as the l ribs, whereby the c linder is given a circular cross-section. ach'plate has a pair of -apertured lugs 14:, as are 4shown in Figs. 6 and 8, which are directed lnward and penetrate the blades 12. The lugs are received in. radial recesses 15 in the cylinder. Tapered locking pins 16 are secured in the cylinder and pass through the apertures of the lugs 14, whereby the plates are drawn inward and the cutting lades rigidly clamped in place.

The bladesproject from each side of each gage plate and it is obvious that two single blades could be used instead of one double blade. The plates cover all of the blades except their cutting edges. The cutting edges of the blades overhang the edges of the pockets 10'and those portions of the ribs 11 underlying the cuttlng edges arefcut -away or recessed at 17 so that said cutting edges are free throughout their lengths and do not contact with the ribs; whereby no place for the accumulation of matter is left anda highly sanitary structure had. It will be seen that a cutting edge is disposed on eachside of each row of ribs. These edges.

may terminate within, coincident with or slightly beyond the circle of the cylinder.

t will be seenthat the gage plates. and the ribspresent a smooth and 'continuous surface with the .depressions caused by the recessesl.'v The cutting edges project into" these recesses and are thus exposed on the surfaceof'lthe cylinder. The skin of the person bein shaved is supported b y the plates and rlbs on each side of the cutting edges and as the edges are onl projected to a slight degree, the beard a dy not the skin 1s c'u f' The cylinder has a celtralopening 18 which receives a shaft 19 so that the 'cylinder rests on a collar,20 base 3. The nally screw which is seated in the upper yend of the-cylinder. A lock screw 22 upper endof the shaft and overlaps -the nut` said screw bein countersunk in the upper vend of the cylin er. By these means the cylinder is made fast on'theshaft. The 'shaft extends', down intozthe handle 1.- I have `,blade seats between the 'said seats having thelr edges exposed projecting through the I shaft has its upper end exterthreaded' to receive a nut 21 r is threaded -into the shown a motor disposed in the handle and connected directly to the shaft ,for rotatingl v the same, but it is yto be understood that the shaft may be driven in various Ways.

Where a guard is used the cylinder is dis! posed in juxtaposition to the inner sides of the 'ribs 6 5. By limiting the projecting pf'the cutting'edges from the edgesof the gage plates 'so that the cutting edges of the' blades 12 -are exposed through the openings the device could .be used without a guard,

as shown in Fig. 2. The operation of the razor has been fully vexplainedin co-pending ap lications.

n Fig. 7 I have shown a modified form of structure which substitutes for the ribs 6 a panel 23 having a vertical row offperforations 24. This panel is supported along each side by webs 25 4which are recessed under the lcutting edges like the recesses 17 and have slots 26 therebetween.

' In shaving the lather passes intothe pockets 10 either between the ribs and under the cutting edges or through thel perforations l24: and slots 26, so that nothing can lodge under the cutting edges.,v

vThe salient feature of this particular invention is the smooth supporting vsurface of the cylinder with the cutting edges ex. lposed to a "limited degree over a clearance depression'fwhereby the skin ofthe face isA supported by the surface portions of the l cylinder immediately ven each side of the cutting edge and thev skin protected from cutting. I have. found that diametrically opposite gage be removed an` the sha-ving operation performed with the remainingy plates and blades. When it is desired to re lace the -blades they are readily remove by' unscrewing and withdrawing the pins 16 so' that the gage plates and blades may be lifted off.

across the .pockets and havin their outer faces concentric with the cylin rical surface ofthe head to support the skin, said ribs having recesses adjacent the ends thereof, pockets, blades on slightly beyond the cylindrical surface of the head and lying beyond said recesses, means to clamp the blades on saidseats and j the he d an having recesses near the opposite en thereof, curved blade seats between ioo lates and their blades can- 1 adjacent pockets, flexible double-edged blades fitted on said seats, gage plates for clamping said blades on said seatsiand having outer faces conforming to the cylindrical contour of the outer surface of the head, the blade edges arranged to project slightly beyond the surface of the head and to lie beyond said recesses, means in the head to hold said gage plates in place, and means to rotate the head.

3. A razor including a rotary head, means to rotate the head, blade seats on the head inwardlyof the surface thereof, gage plates for clamping the blades on said seats with their edges exposed, said plates having studs entering the head, means in the head engaging the studs to bind the -plates in place, and guards beneath the blade edges.

el. A razor including a rotary head having longitudinally extendingv pockets opening through the outer surface thereof, guard ribs across the openings in the pockets arranged contiguous to the surface of the head and having recesses'on the outer faces thereof,

blade seats formed in the head between the Rockets, gage plates fitting over said seats to old the blades in place and causing the edges of the blades to lie opposlte said recesses in the guard ribs, means for binding the gage plates on the head, and means to rotate the head.

5. A razor including a rotary cylindrical head having an axial bore and longitudinal pockets opening through the periphery thereof, blade seats inward of the periphery and located between adjacent pockets, gage plates adapted to fit over the seats and hold the blades thereon, perforated studs on the plates, tapering pins passing through the perforations in the studs, series of spaced guard ribsv extending across the pocket openings and having recesses beneathy the edges of the blades, a shaft passing through the axial bore in the head and made fast therein, a handle connected to the head, and al motor in the handle operatively connectedl to said head.l

In testimony whereof I alix my signature.

a SIDNEY P. JONES.