Electric beard trimmer
A cutter system is for an electric shaver and trimmer, comprising a pair of cooperating cutting elements with two rows of comb-like cutting teeth at opposite edges thereof and cutting perforations between said rows of comb-like cutting teeth, wherein said cutting elements are movably supported relative to each other by a support structure. The cutting perforations are arranged in two separated elongated fields of perforations which are separated from each other by an elongated unperforated center section of an outer one of said cutting elements defining a skin contact surface, and each of at least two rows of perforations extends along the rows of comb-like cutting teeth.
1 . A cutter system for an electric shaver and trimmer, said system comprising:
a pair of cooperating cutting elements comprising an inner cutting element and an outer cutting element, wherein said inner cutting element and said outer cutting element each comprise two rows of comb cutting teeth at opposite edges thereof, wherein said inner cutting element and said outer cutting element each comprise at least one field of cutting perforations between said rows of comb cutting teeth, wherein said inner cutting element is movably supported relative to said outer cutting element by a support structure,
said outer cutting element defining a skin contact surface,
wherein said at least one field of cutting perforations of said outer cutting element includes at least two rows of perforations extending along said rows of comb cutting teeth,
wherein said at least one field of cutting perforations of said inner cutting element comprises elongated transverse perforations, such that at least one elongated transverse perforation cooperates with a corresponding perforation in each of the at least two rows of perforations of the field of perforations of said outer cutting element,
wherein a driver is slidably guided by the support structure and connected to the inner cutting element to drive the inner cutting,
wherein said support structure is configured to sandwich said inner cutting element between said outer cutting element and support ribs of said support structure, wherein a gap is defined between said outer cutting element and said support ribs which is slightly wider than the thickness of the inner cutting element to reduce friction, said support structure further includes a pair of outer frame portions holding said outer cutting element at opposite edge portions thereof, and distal ends of the outer frame portions are spaced from the inner cutting element and the skin contact surface of the outer cutting element in a direction parallel to a direction of a thickness of the inner cutting element.
2 . The cutter system according to claim 1 , wherein said at least one field of cutting perforations of said outer cutting element is separated from said rows of comb teeth by elongated, unperforated side sections of said outer cutting element.
3 . The cutter system according to claim 2 , wherein said support ribs are defined by a pair of support ribs supporting said inner cutting element under said unperforated side sections along outer boundaries of said at least one field of perforations.
4 . The cutter system according to claim 1 , wherein said at least one field of cutting perforations of said outer cutting element is arranged in two separate elongated fields of perforations that are separated from each other by an elongated unperforated center section of said outer cutting element, said elongated unperforated center section has a width which is larger than a width of each of said two separate elongated fields of perforations.
5 . The cutter system according to claim 4 , wherein said skin contact surface which, in cross-sectional view, is continuously, smoothly dome-shaped from one of said rows of comb cutting teeth over said fields of perforations to the other one of said rows of comb cutting teeth, with said elongated unperforated center section defining a largest height over a straight base line going through tooth-tips of said rows of comb cutting teeth.
6 . The cutter system according to claim 4 , wherein each of said fields of perforations of said outer cutting element includes two to five rows of non-circular or hexagonal perforations, wherein a longer main axis of each of said non-circular or hexagonal perforations extends transverse to a longitudinal direction of said at least two rows of perforations.
7 . The cutter system according to claim 4 , wherein said inner cutting element extends unsupported under said elongated unperforated center section between said two separate elongated fields of said perforations.
8 . The cutter system according to claim 4 , wherein said elongated unperforated center section has a width that ranges from 100% to 250% of a width of each of said two separate elongated fields of perforations.
9 . The cutter system according to claim 1 , wherein more than ⅔ of an area of said skin contact surface of said outer cutting element defined between said comb cutting teeth is unperforated.
10 . The cutter system according to claim 1 , wherein said perforations of at least one of said inner element or said outer element have non-circular contours including a longer main axis and a shorter main axis, wherein said perforations are oriented such that said longer main axes extend transverse to said rows of comb cutting teeth and said shorter main axes extend parallel to said rows of comb cutting teeth.
11 . The cutter system according to claim 10 , wherein said non-circular contours are hexagonal.
12 . The cutter system according to claim 1 , wherein said support structure is configured to sandwich said inner cutting element between said outer cutting element and support edges of said support ribs of said support structure, wherein said inner cutting element is movably received in said gap, and wherein said support ribs extending from a base portion of said support structure.
13 . The cutter system according to claim 12 , wherein said support ribs extend from said base portion of said support structure at an angle (B) from 20° to 40°.
14 . The cutter system according to claim 12 , wherein said support edges of said support ribs facing said inner cutting element are spaced from each other at a distance ranging from 35% to 70% of a distance defined between said rows of comb cutting teeth at said opposite edges of said cutting elements.
15 . The cutter system according to claim 12 , wherein said support ribs are rigid so as to not flex under operational loads onto said cutting elements and, when viewed in cross-section, said support ribs define a V-shape and have a linear contour with flat side surfaces.
16 . The cutter system according to claim 1 , wherein said outer frame portions and said outer cutting element define a cutter head chamber which is divided by said support structure into an inner sub-chamber for collecting short hair particles from said perforations and a pair of outer sub-chambers for collecting long hair particles from said comb cutting teeth, wherein said inner sub-chamber communicates with each of said fields of perforations.
17 . An electric shaver and trimmer, comprising said cutter system which is configured in accordance with claim 1 .
18 . The cutter system according to claim 1 , wherein said perforations of said outer cutting element expand from a side opposite to said skin contact surface towards said skin contact surface of said outer cutting element.
19 . The cutter system of claim 1 , wherein said support structure includes said support ribs defined by a pair of support ribs, the driver is located between the pair of support ribs and directly connected to the inner cutting element.