US2562104A - Cutting head for dry shaving razors - Google Patents

Cutting head for dry shaving razors Download PDF

Info

Publication number
US2562104A
US2562104A US9836A US983648A US2562104A US 2562104 A US2562104 A US 2562104A US 9836 A US9836 A US 9836A US 983648 A US983648 A US 983648A US 2562104 A US2562104 A US 2562104A
Authority
US
United States
Prior art keywords
cutting
knife
cutting head
skin
head
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US9836A
Inventor
Kobler Victor
Kobler Werner
Original Assignee
Kobler Victor
Kobler Werner
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to CH629933X priority Critical
Application filed by Kobler Victor, Kobler Werner filed Critical Kobler Victor
Application granted granted Critical
Publication of US2562104A publication Critical patent/US2562104A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B26HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26BHAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B19/00Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers
    • B26B19/02Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers of the reciprocating-cutter type
    • B26B19/04Cutting heads therefor; Cutters therefor; Securing equipment thereof

Description

y 24, 1951 v. KOBLER ET AL 2,562,104

CUTTING HEAD FOR DRY SHAVING RAZORS Filed Feb. 20, 1948 4 A H55 2 Z2 I Patented July 24, 1951 2,562,104. cu'if'lfnsd Eon nRY SHAVING RAZORS Victor-Koblerand Werner Kobler, Zurich, Switzerland Application, February 20, 1948,; Serial No. 9,836

n ..w .a d to 1 .38

Section r, Public at 690, August 8, 1946 Bate texnim o er 7, 19,59

The p esen i vent n re ates t a cu t head for dry shav n azors. ompri n a r gid ho l w ter knife. and a rec cally ma ble nner k ife. m un d n t e o yni t- I Que. o he o j cts of theinventi n is o odues a cutt n sd o th ype re e r d to bove which is so designed as to ODGI'MQ smoothly a d to permit a close shave. To this end the cooperatingspaeed cuttingfaces of both knives are convex curved in their longitudinal direction, 1. e. along the direction in, which the inner knife reciproc tes an are roof haped inthe tra svers direction to that longitudinal direction, that'is, a mposed cf w facets r g d a a large obtuse angle and intersecting at'a medial line so as to: provide an edge or ridge which foreesthe skin to. change its an le. in h shav op ration- This design of the cutting faces permits to obtain the fo lowin ad an a s v c n u tin 111 h ch are strai ht in. thei n itudina direction and flat or rounded the transverse direction:

This curvature allows a better and cleaner shave because the skin. is automatically stretched by the curvature of the cutting surface. Whilst with straight cutting surfaces both outer ends of the cutting face rest on the skin this causing unpleasant pressure, with the longitudinally curved cutting face according to the invention the maximum pressure is concentrated in the centre portion of the cutting face, the ends of the latter rest on the skin with but slight pressure, thus causing no pain. Moreover, the lengthwise outwardly curved cutting head allows concave parts of the skinto be cleanly shaved.

Further features and advantages of the novel cutting head will be pointed out in the following description of an embodiment of the invention which is illustrated by way of example in the accompanying drawing, in which Fig. l is a perspective view of the cutting head,

Fig. 2 is a perspective view of the inner knife,

Fig. 3 is a cross-section of the cutting head.

Fig. 4 is a longitudinal section showing the cutting head and the fastening and driving means for the latter and the top part of the casing.

Figs. 5-8 show diagrammatically cutting surfaces which are roof-shaped and rounded in cross-section and serve for explaining the advantages of the former over the latter.

Referring now to Figs. 1-3 of the drawing I denotes the hollow outer knife, in which the inner knife 4 is inserted. The cutting surface 2 of the outer knife is outwardly curved in the longitudinal direction and is composed of two facets archin reo-43) ranged at a large obtuse angle so, as to intersect a o e a l n di al med a e. or n edge and, thus, may be described as roof-shaped in the transverse direction. The medial edge or ridge of the cutting surface 2 functions as a comb, the teeth of which are separated by spaces 3, through which the hairs to be cut enter the interiorof the hollow outer knife and are cut by the teeth 5 of the inner knife 4, reciprocating in the lon tu in dire one' t th 5 a p: arated by spaces 6., The teeth of the cutting faee of the outer knife are rounded off at their ends and project somewhat beyond the side walls f e O er kni e as. indicated by numeral '1 hu fa i it tin the ent ance o he hair n o the spaces 3.

{The cutting face of the inner knife 4 is also wnvex hamd lon itudina ly t is, in he moving direction of the inner knife, and roofhaped n t t ansv s di e t o im r to th ex ior a d nter or su ac o he o r cu -The ut in fac of the nn r kn e is a i n fit on the cutting face of the outer knife and, on the one hand, is guided in its position by the apex o t e of shan d n eri r sur ace s yt lengthwise curvature, and, on the other handby a groove 8 in the bottom part 9 of the outer knife.

Two bolts ID with grooves ll, arranged in the bottom piece 9 of the outer knife, serve to fasten the cutting head to a housing (Fig. 4) of a dry shaving razor by means of the pawls l2 which, on setting the cutting head, clinch in the grooves I I. The reciprocally moved clapper l3, driven by an electric motor or similar device, is pivoted on an axle pin centrally fitted in the curvature of both cutting surfaces of the cutting head. On the upper free end, the clapper is provided with a small cap l5 which is pressed towards the inner cutting comb by means of the spring [6, thus effecting an elastic impinging of the inner knife on the outer knife. The cap l5 of the clapper l3 engages the slot 1 of the inner knife, thus when oscillating the clapper I3 the inner knife is similarly moved so that the hairs, on entering the cutting spaces of both knives, are then effectively cut. Owing to the arc-like shape of the cutting surfaces, the inner knife moves oscillatorily around the center of the arc, the same serving simultaneously as the axle for the clapper, thus causing the distance between the carrier space 1 and the axle point I4 to remain identical in all moving positions. Thus, the tension of the spring l6 remains invariably the same so that an equal spring pressure is always assured. This also applies practically to embodiments in which the axle point is arranged slightly outside the arc-centre.

It is expedient to choose as large a radius as possible for the cutting surfaces of the cuttin head, for instance, from 50 to 200 mm, but at least about 30 mm., as round cutting surfaces with a smaller radius do not rest entirely in their whole length on the skin to be shaved thus rendering the shaving of convex skin surfaces more difficult.

Fig. 5 shows diagrammatically in cross-section a shaving head with a roof-shaped cutting face and Fig. 6 for sake of comparison a shaving head with a rounded cutting face. Both cutting heads being applied at right angles to the skin 20. With the same deflection T of the skin in the vertical direction the breadth B, on which the shaving takes place when the razor is moved in the direction of the arrow indicated, is much smaller with the roof-shaped cutting face (Fig. 5) than with the rounded cutting face (Fig. 6). The important advantage results thereby that in the first case the inner knife can be much narrower than in the second case, this again means less friction. Moreover with rounded cutting faces the inner knife must be made much wider because a narrow inner knife has no good guidance in the outer knife, whereas with the roof-shaped cutting faces the guidance is perfect. The concentration of the cutting action in the middle portion of the roof-shape in combination with the small inner knife provides a comparatively long way for the hairs to enter into the spaces 3 and facilitates the entering and permits to make the spaces narrow, thus causing less irritation of the skin.

As shown in Figs. 7 and 8 the roof-shaped cutting face (Fig. 7) is also advantageous over the rounded shape (Fig. 8) if the cutting head is guided over the skin to be shaved in a slightly slanting position in as much as the danger of the hairs being bent is much greater in the second case than in the first.

We claim:

A shear head for a dry shaver having in combination, a hollow outer cutter member having an outer surface for engaging the skin during shaving which surface is convexly curved in its longitudinal direction and is composed of two facets arranged at a large obtuse angle and intersecting along a medial longitudinal line, thus forming an edge for engagement with the skin to be shaved, at which edge the skin is forced to change its angle, said outer cutter having a plurality of slots extending transversely of its longitudinal extent, and opening to its hollow interior, the inner surface of said outer member opposite the skin engaging surface being curved longitudinally similarly to the outside and also being composed of two obtusely intersecting facets which form a line at their intersection, and a longitudinally reciprocable inner cutter located within the hollow of the outer cutter and having an outer surface conforming in shape to the inner surface of the outer member opposite the skin-engaging surface and having teeth with spaces therebetween, said inner cutter having less width than the interior intersecting facets so as to have free side edges, and a spring for pressing the inner cutter against said interior intersecting facets so that the inner cutter is guided by the apex of the intersecting facets.

VICTOR KOBLER. WERNER 'KOBLER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Date Germany Aug; 27,1937

US9836A 1939-10-07 1948-02-20 Cutting head for dry shaving razors Expired - Lifetime US2562104A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CH629933X 1939-10-07

Publications (1)

Publication Number Publication Date
US2562104A true US2562104A (en) 1951-07-24

Family

ID=4524676

Family Applications (1)

Application Number Title Priority Date Filing Date
US9836A Expired - Lifetime US2562104A (en) 1939-10-07 1948-02-20 Cutting head for dry shaving razors

Country Status (5)

Country Link
US (1) US2562104A (en)
CH (1) CH221371A (en)
DE (1) DE870959C (en)
FR (1) FR959156A (en)
GB (1) GB629933A (en)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2739380A (en) * 1952-07-09 1956-03-27 Victor Kobler Shearhead for dry shaving apparatus
DE944597C (en) * 1951-10-15 1956-06-21 Bernhard Tissot Dupont The dry shaving apparatus with an arched voltage and having opposite edge portions in slots of a holder mounted shear plate
US2827693A (en) * 1953-06-26 1958-03-25 Victor Kobler Mechanical shaver head having cutter bars of reduced thickness
US2844869A (en) * 1954-01-26 1958-07-29 Schick Inc Shearing head clamping means for electric shaver
US3078570A (en) * 1959-05-19 1963-02-26 Philips Corp Detachable fastening means for attaching shaver head to dry shaver housing
US3111754A (en) * 1961-01-09 1963-11-26 Sperry Rand Corp Cutter unit attachment and ejectment means for electric dry shaver
US3119180A (en) * 1961-12-20 1964-01-28 Bruecker John Shear plate and cutter assembly for rotary-type dry shaver
US3191296A (en) * 1963-01-14 1965-06-29 Sperry Rand Corp Cutter head attachment means
US3226824A (en) * 1963-08-23 1966-01-04 Jacob L Kleinman Shaving head having interlocking means for the outer shearing member
US3325894A (en) * 1965-11-26 1967-06-20 Martin Pearson Reciprocating cutter head for dry shaver
US3332146A (en) * 1964-07-23 1967-07-25 Kratz Gerd Dry razor with removable cutting head
US3417467A (en) * 1967-04-26 1968-12-24 Kobler Paul Shearhead assemblies on electrical and mechanical shavers
DE4338789A1 (en) * 1992-11-13 1994-05-19 Matsushita Electric Works Ltd Dry shaving razor
EP1685931A1 (en) * 2003-11-11 2006-08-02 Matsushita Electric Works, Ltd. Electric razor
US20120192436A1 (en) * 2011-01-31 2012-08-02 Rovcal, Inc. Electric Hair Trimmer Having Arched Detailer

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL84404C (en) * 1950-01-18
DE1089668B (en) * 1958-07-03 1960-09-22 Grady Padgett Cutting head for dry shavers
NL101486C (en) * 1959-05-19
US3103744A (en) * 1959-08-15 1963-09-17 Kobler Victor Dry shaver with hair collecting means
CH380576A (en) * 1960-11-18 1964-07-31 Kobler & Co dry shaving
US3999296A (en) * 1973-08-28 1976-12-28 Kabushiki Kaisha Suwa Seikosha Electric shaver cutter of improved efficacy
US5473818A (en) * 1992-11-25 1995-12-12 Matsushita Electric Works, Ltd. Reciprocatory dry shaver
KR100447912B1 (en) * 1996-04-26 2004-11-03 산요덴키가부시키가이샤 Electric shaver and method of manufacturing outer blade
US6158125A (en) * 1999-02-22 2000-12-12 Dolev; Moshe Cutter assemblies for electric shavers

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE649577C (en) * 1935-06-29 1937-08-27 Michele Grivetto Schergeraet for producing a Rasierschnittes
US2105223A (en) * 1937-02-05 1938-01-11 Nicholl Inc Hair clipper
US2234892A (en) * 1938-04-08 1941-03-11 Bruecker John Shaver
US2244321A (en) * 1938-05-04 1941-06-03 Frank J Winder Shaving clipper
US2315274A (en) * 1938-11-16 1943-03-30 Remington Rand Inc Mechanical razor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE649577C (en) * 1935-06-29 1937-08-27 Michele Grivetto Schergeraet for producing a Rasierschnittes
US2105223A (en) * 1937-02-05 1938-01-11 Nicholl Inc Hair clipper
US2234892A (en) * 1938-04-08 1941-03-11 Bruecker John Shaver
US2244321A (en) * 1938-05-04 1941-06-03 Frank J Winder Shaving clipper
US2315274A (en) * 1938-11-16 1943-03-30 Remington Rand Inc Mechanical razor

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE944597C (en) * 1951-10-15 1956-06-21 Bernhard Tissot Dupont The dry shaving apparatus with an arched voltage and having opposite edge portions in slots of a holder mounted shear plate
US2739380A (en) * 1952-07-09 1956-03-27 Victor Kobler Shearhead for dry shaving apparatus
DE1014458B (en) * 1952-07-09 1957-08-22 Kobler & Co Electrical dry shaving
US2827693A (en) * 1953-06-26 1958-03-25 Victor Kobler Mechanical shaver head having cutter bars of reduced thickness
US2844869A (en) * 1954-01-26 1958-07-29 Schick Inc Shearing head clamping means for electric shaver
US3078570A (en) * 1959-05-19 1963-02-26 Philips Corp Detachable fastening means for attaching shaver head to dry shaver housing
US3111754A (en) * 1961-01-09 1963-11-26 Sperry Rand Corp Cutter unit attachment and ejectment means for electric dry shaver
US3119180A (en) * 1961-12-20 1964-01-28 Bruecker John Shear plate and cutter assembly for rotary-type dry shaver
US3191296A (en) * 1963-01-14 1965-06-29 Sperry Rand Corp Cutter head attachment means
US3226824A (en) * 1963-08-23 1966-01-04 Jacob L Kleinman Shaving head having interlocking means for the outer shearing member
US3332146A (en) * 1964-07-23 1967-07-25 Kratz Gerd Dry razor with removable cutting head
US3325894A (en) * 1965-11-26 1967-06-20 Martin Pearson Reciprocating cutter head for dry shaver
US3417467A (en) * 1967-04-26 1968-12-24 Kobler Paul Shearhead assemblies on electrical and mechanical shavers
DE4338789A1 (en) * 1992-11-13 1994-05-19 Matsushita Electric Works Ltd Dry shaving razor
US5463813A (en) * 1992-11-13 1995-11-07 Matsushita Electric Works, Ltd. Reciprocatory dry shaver
EP1685931A1 (en) * 2003-11-11 2006-08-02 Matsushita Electric Works, Ltd. Electric razor
US20070056166A1 (en) * 2003-11-11 2007-03-15 Matsushita Electric Works, Ltd. Electric shaver
EP1685931B1 (en) * 2003-11-11 2009-08-26 Panasonic Electric Works Co., Ltd. Electric razor
US20100126022A1 (en) * 2003-11-11 2010-05-27 Matsushita Electric Works, Ltd. Electric shaver
US20130125401A1 (en) * 2003-11-11 2013-05-23 Panasonic Corporation Electric shaver
US8806763B2 (en) * 2003-11-11 2014-08-19 Panasonic Corporation Electric shaver
US20120192436A1 (en) * 2011-01-31 2012-08-02 Rovcal, Inc. Electric Hair Trimmer Having Arched Detailer

Also Published As

Publication number Publication date
GB629933A (en) 1949-09-30
FR959156A (en) 1950-03-25
CH221371A (en) 1942-05-31
DE870959C (en) 1953-03-19

Similar Documents

Publication Publication Date Title
US7810240B2 (en) Shaving razors and other hair cutting assemblies
US3786563A (en) Shaving system
US4831731A (en) Multiple blade safety razor
US6161288A (en) Four blade bi-directional razor structure with flexible guard system
RU2315687C2 (en) Safety razor
RU2091213C1 (en) Safety razor
US3138865A (en) Safety razor having skin-stretching and guiding means
DE4312060C1 (en) Cutting head for electric shaver - has drawing-in elements with freely projecting ends which execute combing function, and forming top blade contact surface
EP2181815B1 (en) Wet razor with four blades, and cartridge therefor
ES2317215T3 (en) Shaving machine with additional cutting blade.
US8109001B2 (en) Shaving system for performing multiple shaving actions
ES2262361T3 (en) Shaving machine with knife convex assembly.
US7761999B2 (en) Razor having separate blade groups for shaving and trimming/sculpting
CA1041754A (en) Shaving apparatus with a holder for a cutting element
US4151645A (en) Dry-shaving apparatus with hair-pulling lead cutters
KR100909606B1 (en) Shaving Foil for Electric Shaver
KR880002631A (en) Hair clippers
US6935032B2 (en) Razor cartridge
US3834017A (en) A dry shaver with hair guiding and skin stretching means
US4603477A (en) Safety razors
US20040181954A1 (en) Shaving implement having improved pivot axis location
US8555509B2 (en) Shaving unit for an electric shaver
KR930702126A (en) Shaving system
EP1273400B1 (en) Shaving implement having static and dynamic blades
KR970702131A (en) Safety razors