USRE20169E - Shaving instrument - Google Patents

Description

Reimied Nov. 10, 1936 UNITED STATES The present invention relates to shaving instruments and more specifically to devices which obthe like.

An important feature of the invention resides in the provision of a shaving instrument formed with a handle and having a hollow shell provided with a series of tapered blades and a reciprocating cutter having teeth adapted to contact the inner faces of the blades.

Another object of the invention is in the proyet slidable engagement between the stationary bladesoftheshellandthereciprocatingteethof the cutter.

A further object is to provide a shaving instrument having a handle portion provided with re- Further features are the particular prong 20 means to effect removable union between the handle and shaving head; the resiliently mounted ball means in the shell to afford frictionless pressure against the reciprocating cutter; the novel reciprocating means to provide a greater period of time forthehairto assume aposition between the cutter teeth; and a self supporting, open ended shell for rug and easy cleaning.

'lhese and other objects of the invention and the means for their attainment will be more aptakeninconnectionwiththeaccompanvingdrawing.illustraflng one embodimentbywhichthe invenflonmayberealised, andin which:

ml-isapartialsideelevationalandpartial sectional view of a preferred embodiment of the invention, thehandlebeing brokenaway.

Fig.2isanendelevatlonalviewthereof. Fig.3isasideeievationalviewasseenfrom therightofFig.2. I

Hg.4is,avertiealsectionalviewastakenalong thelinel-lofligJi. I

Figs and'lshowvariouspositionsofthe cutterteethinrelationtotheshellbladeaand Figs.8and9show.inplan,preferredformsof eocentricandslotmeansfor reciprocatingthe cutter viate the necessity of employing hair softeners or vision of means to at all times retain'intimatesilient means to removably retain a shaving head.

parent from the following detailed description,

PATENT OFFICE f SHAVING INSTRUMENT William G.Viall, N.I.,an|l HarryLBankovnBronx KY.

Original No. 2,038,557, dated April 7, 1936, Serial No. 708,016, January 24, 1934. Application for reissue June 25, 1936, Serial No. 87,318

6 Claim (cl. 30-43) The handle is formed with a seat I! which may be curved as shown and is preferabLv provided with sockets ll opening lnrthe seat. Transverse spring'membersii pass from side to side of the handle and intercept the periphery of the sockets II. It communicate with the sockets and surroimd the portions of the spring membe which lie within the sockets.

The shaving head ll comprises essentially a shell II and a cutter ll. The shell is preferably 10 formed as an elongated; hollow, trlangularly shaped, hardened steel member, the sides of which are preferably convexly bowed, joining in an apex as at 2.. One side II is slotted to provide a series of equally spaced tapered blades 22 and l5 as shown in Fig. 2, these blades may be formed with their outer surfaces flattened as at 23. As clearly shown in Fig. 2 the outer and inner surfaces ofside 2| oftheshell, intheregion of the blades, closely approximate tangency. The other side 24 oftheshellmayalsobeslottedinamanr nerquitesimilartothatofthesidell. Thehaselegiioftheshellmay preferablybe somewhat thicker than the ,other legs which are preferably in thickened from the apes 25 downward.- As can readily be seen, a sturdy, selfsumlorting shell having well supported shear blades 2! is in this manner provided. v

Thebaselegiioftheshell llisaperturedat 10 to admit the upper reduced portion ll of the drive shaft l2 and a pairof spaced prongs, each provided with a circumferential groove '20 engageableby the springs II when entered into the sockets II, is fixed toproject from the base legoftheshell. The cutter II is preferably L-shaped and one legisformedwithaseriesofspacedteethll havingparallelsidesanditispreferredthatthese teeth'be' imreasingly thicker as they. approach thehorirontallegfl ofthecutter. Thislegislii preferably straight both longitudinailyandtransi veisely andis'provlded onits under face with a slot I! um le by aneccentric 33 on the drlveshaft.

To insure intimate contact between the cutter teethflandtheshearblades 22-,theshellis provided with means to afford resilient pressure against the cutter. In the present form this comprisesapairofball'sflnrgedagainstthe' cutterbyaleafspringii.

Sincetheinnerfacesoftheshearbladesfland theouterfacesofthecutterteethil preferably havethesamecm'vatln'e,andsincetheleg.tl of thecutterandthebaselegilofthe'shellare acedfromeachother.thereisnoothercontact .li

, balls ll, a proper compression against the cutter,

the cutter is thus mounted to be. easily and smoothly reciprocated within'the hollow of the shell.

As previously stated, it is preferred thatthe shear blades ll be tapered and the cutter blades ll, rectangular, so that upon reciprocation of the cutter a slicing action is obtained therebetween.

Thehaircuttingisafl'ordedatornearthethinnestpartoftheshellandatthlspointitispreferred that the shear blades be proportioned in the following manner: With special reference to Fig. 5, the shear blades 22 are made of a width W and the spaces therebetween W. For the sake of clarity in description, thecutter teeth in this figure are indicated at ,30 30-", and 30 It has been determined that the best cutting results are obtained when one of the cutter teeth is moved from an aligned position with one of the shear blades to an aligned position with either adiacent shear blade; Figs. 5 and 7 illustrate these two extreme positions of the cutter teeth. To accomplish this theiammmt of eccentricity of the eccentric 32 is to "%W" as shown in Fig. 8.

8. teeth at the instant of shearing when moving in one direction and the broken lines indicate the, cutter teeth in the shearing position, when moving in the other The reciprocating movement of the cutter, being imparted by an 'ecwntric, the cutter moves fastest during the shearing operation and slowest when in substantial alignment with the shear blades. This is desirable so as to aflord sufilcient timeforthehairtoa-umea positionbetween the cutter blades.

When the rotation of the shaft II is relatively slow (about 2000 3.2M.) an eccentric as shown in Pig. 8 will aflord suflicient time for the hair to assume a cutting position, but when the shaft is relatively fast (about 3400 R. P. M.) there is not sufficient time for-the hair to assume a proper cutting position and in this instance, the slot 32 ofthecutteriswidenedtoanamountequalto C. and the eccentricity of the eccentric made to equal %W+ 5&0. Now there will be two periods ofmomentaryrestofthecutterwhen itsteeth are'aligned with the shear blades. The above is desirableyduetothedifllcultyinconstructinga slow speed motor capable of the handle ll.

Itisnowreadilyapparentthatashavinginbeing housed within strument has been provided which, for the purpose intended, is a considerable improvement over made by thoseskilled in the art without departing fromthe generalbroad scope ofthe invention.

cutter havingteethreciprocally movable within theshellgsaidshearblades andcutterteethhaving a a handle, andmeans theshellinthe 6 illustrates the position of the cum.

2. A shaving instrument comprising an elongated, hollow, polygonal shell having shear blades in one wall thereof, at least one of the walls of said shell being convexly bowed, and two of said walls being increasingly thickened from their common apex to afford rigidity to the shell, 8.

, cutter having teeth reciprocally movable within the shell, said shear blades and cutter teeth having a shearing engagement, said cutter being substantially 'L-shaped, a handle, and means to removably secure the shell in the handle.

3. A shaving instrument comprising a handle and an elongated, hollow, shell at an end thereof, said shell having transverse shear blades in a portion thereof, said shell in the region of the blades, having an arcuate inner surface, the inner and outer surfaces of said shell in said region, closely approximating tangency so that the wall of the shell, from the line of substantial tangency outward in opposite transverse directions .is increasingly thickened to aflord rigidity to the shell, a cutter reciprocalLv movable within the shell, said cutter having an upstanding portion carrying transversely curved teeth having shearing engagement with the shear blades, said cutter having -a substantially horizontal base, and means extending lengthwise of the handle and approximately perpendicular to the plane of the base and connected directly therewith for reciprocating the cutter.

4. A shaving instrument comprising a handle and an elongated, hollow, one-piece integral shell at an end thereof, said shell having integral transverse shear .blades in a portion thereof, said shell in the region of the blades, having an arcuate inner surface, the inner. and outer surfaces of said shell in said region, closely approximating tangency so that the wall of the shell, from the line of substantial tangency outward in opposite transverse directions is increasingly thickened to afford rigidity to the shell, a cutter reciprocally. movable within the shell, said cutter having an upstanding portion carrying transversely curved teeth having shearing engagement with the shear blades, said cutter having a substantially horizontal base; yieldably moimted anti-friction bearing means carried by the instrument and bearing against the cutter in a direction approximately at right angles to a line tangent to the curve of the shear blades, and means extending lengthwise of the handle and approximately p mand an elongated hollow one-piece integralshell at an end thereof, said shell having integral transverse shear blades in the outer portion thereof, said outer portion being opnvexly bowed and said convexly bowed portion being increasingly thickened in opposite transverse directions from an intermediate point to afford rigidity to the shell, and a cutter having an upstanding portion carrying transveisely curved hav- 'ing' shearing engagement with theshear blades,

said cutter having a substantially hori mntal base, means cooperating with said ba'seffor guiding the movement/thereof in'a straight line, and means extending le'ngthw'iseof the and approximately perpendicular to ofthe base and therewith-for reciprocating said cutter} 6. A shaving instrument comprisinga'handle and an elongated'hollow shell havinga-ba'se portion extending transversely of and directly to an end of the handle. said shell havin; transverse shear blades in a portion thereof, a cutter reciprocally movable within the shell and having an approximately-horizontal base arranged in close proximity with and extending along the base portion of the shell and having an upstanding portion carrying transversely curved teeth having shearing engagement with the shear blades, said base of the cutter being in position to be disposed in an approximately horizontal position when the handle is in an upright position with the shell at the upper end thereof, and means extending lengthwise of the handle and approximately perpendicular to the plane of the base and connected therewith tor reciprocating said cutter.

WILLIAM G. VIALL.

HARRY A. RANKOW.

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