Claims
- 1. An inner cutter for a dry shaver, comprising an annular metallic hollow tube having a 360.degree. right-circular cross-section, a plurality of slots formed transversely at intervals along the length of said tube to provide fluid communication between the exterior of said tube and the hollow interior of said tube to define a series of arcuate bridge members, a plurality of arcuate teeth of lesser axial extent than said bridge members formed on said bridge members by shallow annular grooves formed at finite depth in the external circumference of said tube, said grooves reducing the thickness of said bridge members, each of said bridge members having a single tooth formed thereon, the thickness of said bridge members to either side of said tooth being reduced by the depth of said grooves, wherein each of said grooves span a respective slot and an axial margin of the adjacent said bridge member on each side of the said slot, so that each of said arcuate teeth form part of an annular band extending commpletely around said tube between adjacent said grooves.
- 2. An inner cutter according to claim 1, wherein the depth of said grooves, and thus the radial height of said arcuate teeth, is between 0.25 and 0.40 mm.
- 3. An inner cutter according to claim 2, wherein the axial width of each said bridge member is 0.6 mm and the width of each said tooth is 0.1 mm.
- 4. In or for use in a dry shaver comprising an arched, perforated foil shear plate, an inner cutter for shearing co-operation with said shear plate, said inner cutter comprising an annular metallic hollow tube having a 360.degree. circular cross-section, a plurality of slots formed transversely at intervals along the length of said tube to provide fluid communication between the exterior of said tube and the hollow interior of said tube and to define a series of arcuate bridge members separated by said slots, and means defining a plurality of shallow annular grooves formed at a finate depth in the external circumference of said tube, said grooves reducing the thickness of said bridge members, each of said grooves aligned with one of said slots but of greater axial extent than said slot, said grooves defining narrow teeth, one on each of said bridge members, each tooth being of lesser axial extent than said bridge members on which it is formed, and each said tooth forming part of a continuous annular rib extending completely around said tube.
- 5. An inner cutter as claimed in claim 4 wherein a radius is formed at the transitions between opposite sides of said teeth and the adjacent cylindrical surfaces of said bridge members.
- 6. A process of forming an inner cutter for a dry shaver comprising the steps of providing an annular metallic hollow tube having a 360.degree. right-circular cross-section;
- forming a plurality of slots transversely at intervals along the length of said tube to provide fluid communication between the exterior of said tube and the hollow interior of said tube thereby forming a series of arcuate bridge members; and
- providing shallow annular grooves completely around said tube and formed at a finite depth in the external circumference of said tube, said tube reducing the thickness of said bridge member, thereby forming a plurality of arcuate teeth of lesser axial extent than said bridge members thereby forming said arcuate teeth as an annular band extending completely around said tube between adjacent grooves.
Priority Claims (2)
Number |
Date |
Country |
Kind |
8135234 |
Nov 1981 |
GBX |
|
8225907 |
Nov 1981 |
GBX |
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Parent Case Info
This application is a continuation, of application Ser. No. 443,974, filed Nov. 23, 1982 now abandoned.
US Referenced Citations (15)
Foreign Referenced Citations (7)
Number |
Date |
Country |
171778 |
Jul 1952 |
ATX |
573007 |
Mar 1933 |
DE2 |
1004519 |
Aug 1957 |
DEX |
1177035 |
Aug 1964 |
DEX |
1227811 |
Apr 1960 |
FRX |
175497 |
Aug 1912 |
JPX |
177782 |
Aug 1931 |
JPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
443974 |
Nov 1982 |
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