Blade set and hair cutting appliance

Patent metadata

Field	Value
Publication number	US-9789617-B2
Application number	US-201415026048-A
Country	US
Kind code	B2
Filing date	Sep 29, 2014
Priority date	Oct 1, 2013
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

The present invention relates to a hair cutting appliance ( 10 ), a blade set ( 20 ) for a hair cutting appliance ( 10 ), and to a stationary blade ( 22 ) for said blade set ( 20 ), said blade comprising a first wall portion ( 44 ) and a second wall portion ( 46 ), each which defining a first surface ( 80, 82, 84 ), and a second surface ( 86, 88, 90 ) facing away from the first surface ( 80, 82, 84 ), and an intermediate wall portion ( 48 ) arranged between the first and the second wall portion ( 46 ), wherein the first wall portion ( 44 ) the second wall portion ( 46 ) and the intermediate wall portion ( 48 ) jointly define at least one toothed leading edge ( 32, 34 ), wherein the first surfaces ( 80, 82 ) of the first wall portion ( 44 ) and the second wall portion ( 46 ) face each other, at least at their leading edges ( 32, 34 ), the first wall portion ( 44 ), the second wall portion ( 46 ) and the intermediate wall portion ( 48 ) are interconnected at their tips ( 38 ) to define a plurality of teeth ( 40 ), wherein the first surfaces ( 80, 82 ) of the first wall portion ( 44 ) and the second wall portion ( 46 ) define therebetween a guide slot ( 76 ) for a movable blade ( 24 ) of said blade set ( 20 ), wherein the first wall portion ( 44 ), the second wall portion ( 46 ) and the intermediate wall portion ( 48 ) comprise an overall height extension (to), and wherein the overall height extension (to) of the first wall portion ( 44 ), the second wall portion ( 46 ) and the intermediate wall portion ( 48 ), at least at the at least one leading edge ( 32, 34 ), is in the range of about 0.3 mm to about 0.75 mm, preferably in the range of about 0.4 mm to 0.5 mm.

First claim

The invention claimed is:

1. A stationary blade for a blade set of a hair cutting appliance, said blade set being arranged to be moved through hair in a moving direction to cut hair, said blade comprising
a first wall portion arranged to serve as a skin facing wall portion during operation, the first wall portion extending in a substantially flat manner,
a second wall portion, each of the first and the second wall portion defining
a first surface, and
a second surface facing away from the first surface, and

an intermediate wall portion arranged between the first and the second wall portion,
wherein the first wall portion the second wall portion and the intermediate wall portion jointly define at least one toothed leading edge comprising a plurality of mutually spaced apart projections provided with respective tips,
wherein the toothed leading edge at least partially extends in a transverse direction (Y, t) relative to the moving direction assumed during operation, wherein the mutually spaced apart projections at least partially extend forwardly in a longitudinal direction (X, r) approximately perpendicular to the transverse direction (Y, t),
wherein the first surfaces of the first wall portion and the second wall portion face each other, at least at their leading edges,
wherein facing projections along the leading edges of the first wall portion, the second wall portion and the intermediate wall portion are interconnected at their tips to define a plurality of teeth,
wherein the first surfaces of the first wall portion and the second wall portion define therebetween a guide slot for a movable blade of said blade set,
wherein the first wall portion, the second wall portion and the intermediate wall portion comprise an overall height extension (t o ),
wherein the overall height extension (t o ) of the first wall portion, the second wall portion and the intermediate wall portion, at least at the at least one leading edge, is in the range of about 0.3 mm to about 0.75 mm, preferably in the range of about 0.4 mm to 0.5 mm, and
wherein a ratio between the height extension (t 2 ) of the second wall portion and the height extension (t 1 ) of the first wall portion is in the range of about 1.2:1 to 3.0:1.

2. The stationary blade as claimed in claim 1 , wherein the first wall portion, at least at the at least one leading edge, comprises a height extension (t 1 ), that is in the range of about 0.04 mm to 0.25 mm, preferably in the range of about 0.04 mm to 0.18 mm, more preferably in the range of about 0.04 mm to 0.14 mm.

3. The stationary blade as claimed in claim 2 , wherein the second wall portion comprises a height extension (t 2 ), at least at the at least one leading edge, that is different from a respective height extension of the first wall portion, wherein the height extension (t 2 ) of the second wall portion is in the range of about 0.08 mm to 0.4 mm, preferably in the range of about 0.15 mm to 0.25 mm, more preferably in the range of about 0.18 mm to 0.22 mm.

4. The stationary blade as claimed in as claimed in claim 1 , wherein the ratio between the height extension of the second wall portion and the height extension of the first wall portion is in the range of about 1.5:1 to 1.8:1.

5. The stationary blade as claimed in claim 1 , wherein the guide slot for the movable blade forwardly extends into the forwardly extending projections such that the teeth formed by the first wall portion, the second wall portion and the intermediate wall portion, viewed in a cross-sectional plane perpendicular to the transverse direction (Y, t), are generally U-shaped, wherein a first leg tooth thereof is defined by the first wall portion, wherein a second tooth leg thereof is defined by the second wall portion, wherein a connecting region thereof is formed by the intermediate wall portion, and wherein a respective inner space between the first tooth leg and the second tooth leg of the U-shaped teeth is arranged for housing respective teeth of the movable blade for relative sliding motion.

6. The stationary blade as claimed in claim 1 , wherein the connecting region formed by the intermediate wall portion at the at least one leading edge comprises a longitudinal extension (l fl ) in the range of about 0.35 mm to 1.5 mm, particularly in the range of about 0.5 mm to 1.1 mm, more particularly in the range of about 0.75 mm to 0.9 mm.

7. The stationary blade as claimed in claim 1 , wherein the teeth alternate with tooth spaces therebetween, wherein the tooth spaces comprise a lateral extension (w ss ) in the range of about 0.15 mm to 0.4 mm, preferably in the range of about 0.2 mm to about 0.33 mm, more preferably in the range of about 0.25 mm to 0.28 mm.

8. The stationary blade as claimed in claim 1 , wherein the teeth alternate with tooth spaces therebetween, wherein a ratio between the lateral extension (w ss ) of the tooth spaces and the height extension (t 1 ) of the first wall portion, at least at the at least one transversely extending leading edge, is in the range of about 4.8:1 to 2:1, preferably in the range of about 3.7:1 to 2:1, more preferably in the range of about 3.1:1 to 2:1.

9. The stationary blade as claimed in claim 1 , wherein the teeth comprise a lateral extension (w ts ) in the range of about 0.25 mm to 0.6 mm, preferably in the range of about 0.3 mm to about 0.5 mm, more preferably in the range of about 0.35 mm to 0.45 mm.

10. The stationary blade as claimed in claim 1 , wherein the teeth at the at least one leading edge are arranged at a pitch dimension (p) in the range of about 0.4 mm to about 1.0 mm, preferably in the range of about 0.5 mm to about 0.8 mm, more preferably in the range of about 0.6 mm to about 0.7 mm.

11. The stationary blade as claimed in claim 1 , wherein the teeth comprise a longitudinal extension (l ts ) defined by a tooth base and a tooth tip end in the range of about 0.6 mm to 2.5 mm, particularly in the range of about 1.0 mm to 2.0 mm, more particularly in the range of about 1.5 mm to 2.0 mm.

12. The stationary blade as claimed in claim 1 , wherein at last some of the forwardly extending projections forming the teeth, viewed in a cross-sectional plane perpendicular to the longitudinal direction (X, r), comprise a curved edge transition (R tle ) between an lateral surface and a contact surface that is formed as a longitudinal extension of the second surface of the first wall portion, wherein a radius of curved edge transition is in the range of about 0.05 mm to 0.07 mm, particularly in the range of about 0.053 mm to 0.063 mm.

13. The stationary blade as claimed in claim 1 , wherein the first wall portion, the second wall portion, and the intermediate wall portion jointly form, at a first longitudinal end, a first toothed leading edge, and, at a second longitudinal end, a second toothed leading edge, wherein the first leading edge and the second leading edge are facing away from each other, wherein each of the first leading edge and the second leading edge comprises a teeth portion, and wherein the stationary blade is arranged for housing a movable blade comprising two corresponding toothed leading edges.

14. A blade set for a hair cutting appliance, said blade set being arranged to be moved through hair in a moving direction to cut hair, said blade set comprising:
a stationary blade as claimed in claim 1 ; and
a movable blade with at least one toothed leading edge, said movable blade being movably arranged within the guide slot defined by the stationary blade, such that, upon lateral motion or rotation of the movable blade relative to the stationary blade, the at least one toothed leading edge of the movable blade

Assignees

• Koninklijke Philips Nv
• Koninklijke Phillips N V

Inventors

• Stapelbroek Martinus Bernardus
• Bennik Jan
• Aitink Albert Jan
• Van Der Scheer Robbert Freerk
• Ripandelli Remy
• Pragt Johan
• Voorhorst Fokke Roelof

Classifications

• B26B19/06

  involving co-operating cutting elements both of which have shearing teeth · CPC title

• B26B19/3846 Primary

  Blades; Cutters (B26B19/044, B26B19/141 take precedence) · CPC title

• B26B19/38 Primary

  Details of, or accessories for, hair clippers, or dry shavers, e.g. housings, casings, grips, guards (cutters, cutting heads B26B19/04, B26B19/12, B26B19/14; cleaning or disinfecting devices A45D27/46; drying devices A45D27/48; casings for electric apparatus in general H05K) · CPC title