US3890709A - Rotatable cutter head for an electric dry shaver - Google Patents

Rotatable cutter head for an electric dry shaver Download PDF

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Publication number
US3890709A
US3890709A US421069A US42106973A US3890709A US 3890709 A US3890709 A US 3890709A US 421069 A US421069 A US 421069A US 42106973 A US42106973 A US 42106973A US 3890709 A US3890709 A US 3890709A
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United States
Prior art keywords
cutter
slot
extending
spring
aperture
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
US421069A
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English (en)
Inventor
Eduard Willem Tietjens
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US Philips Corp
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US Philips Corp
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Filing date
Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
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Publication of US3890709A publication Critical patent/US3890709A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B19/00—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers
    • B26B19/14—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers of the rotary-cutter type; Cutting heads therefor; Cutters therefor
    • B26B19/141—Details of inner cutters having their axes of rotation perpendicular to the cutting surface

Definitions

  • a rotatable cutter head for an electric dry-shaving apparatus having a perforated shear foil the cutter head including a supporting member provided with slots, and in each slot a plate-shaped cutter, which extends through the supporting member and is pressed against the lower surface of the shear foil by a spring, which extends through an opening in the lower part of the cutter.
  • the invention relates to a rotatable cutter head for an electric dry-shaving apparatus provided with a thin round perforated shear plate or foil.
  • the cutter head comprises a number of substantially plate-shaped cut ters each of which is separately guided in an associated guide slot in a supporting member, projects from the supporting member at either side, and has a cutting edge at one side; the other side is connected to a spring which is attached to the supporting member for resiliently loading the cutter in the direction of the cutting edge.
  • a rotatable cutter head of this type is described in German Pat. No. 1,033,090, the cutters being secured in leaf springs in slots near the ends thereof. These slots are formed in the springs by bending tabs which are stamped out of the springs at three sides. In the slots the cutters are secured so that free ends of the stampedout, bent tabs engage with a correspondingly bent portion of the cutters, the cutter with the porjecting portions resting at the top of the leaf spring.
  • the leaf springs are combined to a spring element, which has the shape of a ring, and whichis located near the hub of the cutter head. From the ring part the leaf springs extend radially, with the ends near the cutter head bent tangentially, and the free ends carrying the cutters.
  • the cutters are disposed in the cutter support in such a way that, if they should assume an oblique position relative to the shear plate under the influence of forces exerted on them during shaving, automatically a torque is produced owing to the centrifugal force acting on the cutter and a centripetal reaction force, which restores the cutter to its original position.
  • the cutters should be capable of performing a tilting movement in the guide slot, in a plane which extends through the axis of rotation of the cutter head, irrespective of the previously discussed tilting movement in a plane perpendicular to said plane.
  • the springs extend through an opening in the cutters, the freedom of movement of each cutter is not substantially affected by the spring, the dimensions of the springs can be very small, and the cutters are moreover locked against dropping out.
  • the cutter head comprises a stop for the associated cutter, which stop is rigidly connected to the supporting member, (b) and that the spring extends through the opening in the cutter when the cutter is pressed against the stop.
  • a preferred embodiment of the invention is characterized in that the stop is located at the side opposite the guide slot, and the cutter cooperates with the stop with its end which cooperates with the spring.
  • a further embodiment is of importance for exactly matching the force to be provided by the leaf springs and for providing a method of manufacturing the resilient member which is simple and suited for mass production.
  • the embodiment is characterized in that the spring member is entirely flat, and that the leaf springs are connected to parts of the spring member which are clamped between the supporting member and one or more compression members connected thereto.
  • the entirely flat spring member according to this embodiment of the invention may for example also be manufactured by an etching process or by electrodepositing.
  • a favorable construction of a cutter head according to the invention which is eminently suited for mass production, can be obtained by means of a further embodiment of the invention, which is characterized in that the spring member comprises a number of substantially radially extending arms, that the leaf springs extend substantially tangentially, that the supporting member has a hub on which a single compression member is disposed, which is provided with raised clamping parts corresponding to the arms of the spring member and which also serves as a stop for the cutters.
  • FIG. 1 shows a side elevation, partly in crosssection, of a cutter head, in which the separately springmounted cutters press against a flat shear plate, only one cutter being situated in the part shown in crosssection, and
  • FIG. 2 is a top plan view of. the cutter head of FIG. 1, in which part of the supporting member is cut away, so that the Figure partly showsthe compression member which is disposed underneath the supporting member and the spring member which bears thereon, part of the spring member being also cut away.
  • FIG. 1 shows a dry-shaving apparatus, from which all parts which are irrelevant for the invention have been omitted.
  • a perforated shear foil 1, provided with hair entrance apertures 2, is shown in cross-section.
  • a cutter head 3 Underneath the foil a cutter head 3 is located, which is dis posed on a rotatable spindle 4 of the shaving apparatus.
  • the cutter head comprises a number of substantially plate-shaped cutters 5, which are each separately guided in an associated guide slot 6 in a supporting member 7 and which project from either side of the supporting member.
  • Each of the cutters has a cutting edge 8 at one side, and at its other end 9 is connected to a leaf spring 10 which is attached to the supporting member 7.
  • the leaf spring resiliently loads the cutter 5 in the direction of the cutting edge 8.
  • the leaf springs 10 are interconnected to form a spring member 11 formed of a resilient sheet material.
  • the leaf springs 10 are entirely flat.
  • the length of the part of the leaf spring 10 between its free end 13 and the opening 12 in the cutter 5, the distance between the opening 12 and the nearest end 9 of the cutter, the slidability of the cutter 5 in its associated guide slot 6 and the supp rting member 7, and the dimensions of the leaf spring 10 and the opening 12 have been selected so that, with a leaf spring 10 mounted and a cutter 5 not mounted, a cutter which is inserted through a guide slot 6; with its end 9 which contains the opening 12, first bends a leaf spring 10 to a maximum, then pushes the end 13 of the leaf spring 10 along the lateral edge 14 of the cutter which faces the spring, and finally engages with and passes through the opening 12 towards the other side under the influence of the spring action.
  • each leaf spring 10 which faces the guide slot 6, a stop 15 for the associated cutter 5 is located, rigidly connected to the supporting member 7, and at such a distance that when the cutter 5 is pressed against the stop 15, the leaf spring 10 extends through the opening 12 in the cutter.
  • the spring member 11 is entirely flat.
  • the leaf springs 10 are connected to parts 16 of the spring member 11 which are clamped between the supporting member 7 and one or more compression members 17 connected thereto.
  • the spring member 11 comprises a number of arms 18 which extend substantially radially.
  • the leaf springs 10 extend substantially tangentially.
  • the supporting member 7 has a hub 19 on which the one-piece compression member in the form of a pressure cup 17 is secured with the aid of speed nut 20.
  • the pressure cup 17 comprises a number of clamping members 21, which correspond to the radially extending arms 18 of the spring member 11.
  • the bottom surface 22 serves as a stop for each of the cutters 5.
  • two earns 23 are provided on the supporting member.
  • FIG. 2 the projection of the cams 23 is shown and it can be seen that the distance of the cams has been selected so that this is just slightly greater than the local width of the arm 18 of the spring member.
  • the cams 23 also serve to locate the pressure cup 17 relative to the supporting member 7.
  • the scope of the invention is not limited to the embodiment shown in the drawing.
  • wire springs instead of leaf springs, whose ends extend through the openings 12 in the cutters.
  • These springs may be rod-shaped and connected with one end to the supporting member 7 and/or the pressure cup 17, for example, by clamping them in openings in the supporting member 7 or the pressure cup 17 provided for this purpose, or by clamping them between the supporting member and the pressure cup.
  • the springs may then be connected to each other in pairs to form one unit.
  • the springs may also be spiral or helical springs manufactured from a filamentary material.
  • the embodiment shown has the advantage over such other embodiments in that the spring can readily be adapted to produce very small compression forces of the order of magnitude of 5 to 10 grams per cutter, and can be manufactured, handled and assembled simply and inexpensively in mass production.
  • a rotatable cutter head including a support member having top and bottom surfaces, being rotatable about a central axis, and including a plurality of slots extending therethrough with corresponding top and bottom parts, a plurality of cutters each being situated in one of said slots, means for rotating said support member, each cutter having a central part in said slot, a top part extending above the top of said slot and terminating in a cutting edge for engaging said shear plate, and a bottom part extending below the bottom of said slot with an aperture in said bottom part of said cutter transverse of said slot, and spring means secured to the said support member and having a resilient finger extending at least partially across the bottom of each slot and having diameter smaller than said aperture in the cutter, said finger when a cutter is inserted downward through each slot, initially blocking the cutters bottom part from extending through the bottom of the slot, said spring being deflectable when the cutter is urged further downward until said finger springs through said
  • Apparatus according to claim 1 further comprising stop means carried by said cutter head and situated below each slot for preventing movement of said cutter through said slot beyond a predetermined lower limit, after said fingers have traversed said apertures.
  • said spring means comprises a plurality of said fingers all extending from and contiguous with a central member.
  • said spring means comprises an inner ring as said central member, an outer ring of larger diameter concentric with said inner ring, a plurality of arms extending generally radially between said rings, and a plurality of said fingers extending generally tangentially angled from said arms.
  • said spring means comprises a plurality of said fingers all extending from and contiguous with a central member.
  • a rotatable cutter head including a support member having top and bottom surfaces, being rotatable about a central axis, and including a plurality of slots extending therethrough with corresponding top and bottom parts, a plurality of cutters each being situated in one of said slots, means for rotating said support member, each cutter having a central part in said slot, at top part extending above the top of said slot and terminating in a cutting edge for engaging said shear plate, and a bottorn part extending below the bottom of said slot with an aperture in said bottom part of said cutter transverse of said slot, and spring means secured to the said support member and having a resilient finger extending at least partially across the bottom of each slot and having diameter smaller than said aperture in the cutter, said finger when a cutter is inserted downward through each slot, initially blocking the cutters bottom part from extending through the bottom of the slot, said spring being deflectable when the cutter is urged further downward until said finger springs through
  • said spring means comprises an inner ring, an outer ring of larger diameter concentric with said inner ring, a plurality of arms extending generally radially between said rings, af d a plurality of said fingers extending'generally tangentially angled from said arms.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dry Shavers And Clippers (AREA)
US421069A 1973-01-12 1973-12-03 Rotatable cutter head for an electric dry shaver Expired - Lifetime US3890709A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7300454A NL7300454A (it) 1973-01-12 1973-01-12

Publications (1)

Publication Number Publication Date
US3890709A true US3890709A (en) 1975-06-24

Family

ID=19818006

Family Applications (1)

Application Number Title Priority Date Filing Date
US421069A Expired - Lifetime US3890709A (en) 1973-01-12 1973-12-03 Rotatable cutter head for an electric dry shaver

Country Status (13)

Country Link
US (1) US3890709A (it)
JP (1) JPS49121792U (it)
AR (1) AR199940A1 (it)
AT (1) AT329405B (it)
AU (1) AU6431774A (it)
BR (1) BR7400113D0 (it)
CA (1) CA1003627A (it)
DE (1) DE2364646C3 (it)
ES (1) ES422171A1 (it)
FR (1) FR2213839B1 (it)
GB (1) GB1453944A (it)
IT (1) IT1006832B (it)
NL (1) NL7300454A (it)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4137629A (en) * 1976-05-26 1979-02-06 Izumi Seimitsu-Kogyo Kabushiki Gaisha Electric shaver
US4192065A (en) * 1976-05-14 1980-03-11 U.S. Philips Corporation Shaving apparatus
US4283849A (en) * 1978-09-21 1981-08-18 U.S. Philips Corporation Cutting unit for a dry-shaving apparatus
US4343086A (en) * 1979-05-23 1982-08-10 U.S. Philips Corporation Shaving apparatus
DE3518455A1 (de) * 1984-05-23 1985-11-28 Matsushita Electric Works, Ltd., Kadoma, Osaka Scherkopf fuer einen elektrischen rasierapparat
US4882840A (en) * 1986-04-08 1989-11-28 U.S. Philips Corp. Dry-shaving apparatus
US20150343652A1 (en) * 2014-05-30 2015-12-03 Izumi Products Company Rotary electric shaver

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4758050A (en) * 1984-07-06 1988-07-19 Equipment Development Co., Inc. Stripping machine cutter finger assembly

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3710442A (en) * 1969-12-05 1973-01-16 G Meyer Dry shaving apparatus

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2472853A (en) * 1945-03-01 1949-06-14 Eleanor U Andrews Shaving apparatus
JPS4030999Y1 (it) * 1964-05-29 1965-10-30
JPS4323551Y1 (it) * 1967-02-27 1968-10-04
NL7108535A (it) * 1971-06-21 1972-12-27

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3710442A (en) * 1969-12-05 1973-01-16 G Meyer Dry shaving apparatus

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4192065A (en) * 1976-05-14 1980-03-11 U.S. Philips Corporation Shaving apparatus
US4137629A (en) * 1976-05-26 1979-02-06 Izumi Seimitsu-Kogyo Kabushiki Gaisha Electric shaver
US4283849A (en) * 1978-09-21 1981-08-18 U.S. Philips Corporation Cutting unit for a dry-shaving apparatus
US4343086A (en) * 1979-05-23 1982-08-10 U.S. Philips Corporation Shaving apparatus
DE3518455A1 (de) * 1984-05-23 1985-11-28 Matsushita Electric Works, Ltd., Kadoma, Osaka Scherkopf fuer einen elektrischen rasierapparat
US4635360A (en) * 1984-05-23 1987-01-13 Matsushita Electric Works, Ltd. Cutting head for an electric shaver
US4882840A (en) * 1986-04-08 1989-11-28 U.S. Philips Corp. Dry-shaving apparatus
US20150343652A1 (en) * 2014-05-30 2015-12-03 Izumi Products Company Rotary electric shaver
US9789616B2 (en) * 2014-05-30 2017-10-17 Izumi Products Company Rotary electric shaver

Also Published As

Publication number Publication date
CA1003627A (en) 1977-01-18
FR2213839A1 (it) 1974-08-09
JPS49121792U (it) 1974-10-18
ATA13674A (de) 1975-07-15
AR199940A1 (es) 1974-10-08
AT329405B (de) 1976-05-10
DE2364646C3 (de) 1981-04-02
DE2364646A1 (de) 1974-07-18
ES422171A1 (es) 1976-04-16
BR7400113D0 (pt) 1974-08-15
NL7300454A (it) 1974-07-16
AU6431774A (en) 1975-07-10
GB1453944A (en) 1976-10-27
FR2213839B1 (it) 1976-11-26
IT1006832B (it) 1976-10-20
DE2364646B2 (de) 1980-08-07

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