Metal tools and implements – making – Blank or process – Cutlery
Patent
1996-11-13
1998-09-08
Payer, Hwei-Siu
Metal tools and implements, making
Blank or process
Cutlery
30 4392, B21K 1100, B26B 1938
Patent
active
058029320
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a cutter which performs the function of either the outer cutter or the inner cutter in a cutting device comprised of outer and inner cutter of an electric shaving apparatus or an electric beard trimmer, which includes in its cutting area configured as a plane sliding surface a plurality of teeth extending from a comb strip with slots therebetween and cutting edges formed on the tooth edges, and on which cutter one or several wall portions angled relative to the cutting area are arranged, with the outer and the inner cutter being caused to perform parallel relative movements against each other during a cutting action, such that hair entering the slots in the outer and inner cutter will be cut off by the cutting edges.
On pages 4 to 9 of applicant's Product Catalog, Fall 1992 issue, a plurality of electrically powered shavers are offered most of which include, apart from the conventional shaving foil cutter, an additional long-hair trimmer. These long-hair trimmers are essentially comprised of two comb-type cutters having their teeth in relative sliding engagement, of which the outer cutter which is to be moved into engagement with the skin to be shaved is the stationary member, while the inner cutter is the driving member that slides along the outer cutter in an oscillating manner. In the area of the teeth, the blades of both the inner and the outer cutter are required to lie flat against each other in order to prevent hair from penetrating between the outer and inner cutter during a cutting action which necessarily produces less satisfactory cutting results. To eliminate these disadvantages, the sliding surfaces of the blades of outer and inner cutter which slide upon each other must be plane and smooth to allow relative sliding movement of the blades in a nearly snug fit. Additional spring forces exerting a defined contact pressure ensure that the oscillating inner cutter is at all times in snug sliding engagement with the outer cutter.
For an improved cutting performance, it is however not only the planeness but also the sharpness and the service life of the cutters that are of great importance. For this purpose, the cutters are stamped out from a piece of sheet steel or are formed by etching. Subsequently, the sheet metal parts are bent and then hardened. Finally, the surface of the effective cutting areas of the teeth is face-ground and/or polished. The grinding operation makes the prior hardened cutting edges sharper; yet, the cutting edge sharpness obtainable with this process is only in the range of between 10 and 15 .mu.m. While this presents an improvement of the cutting performance over unground or unpolished sliding surfaces of the teeth, good cutting results still fail to be accomplished.
In addition to the customary short-hair cutter heads for a normal shave, there is further known from DE-A-43 13 371 an electric shaving apparatus having a cutting device comprised of outer and inner cutter. This particular cutting device referred to is a central cutter which is intended to cut longer beard hair. In this central cutter, both the outer and the inner cutter are comprised of a sheet metal member bent in a U-shaped configuration and hardened following the stamping and bending process. To obtain the requisite planeness to ensure good cutting results, the irregularities on the sliding surfaces resulting from the bending action are abraded down by grinding.
Further, commercially available shavers of the 255, 355 or 550 type of the Philips company are known, in which three round cutters serving as outer cutters are provided on the shaving head for sliding engagement with round rotary cutters serving as inner cutters. The outer cutters are round, cup-shaped sheet-metal members integrally made of one piece and including bridge members and slots, with the sheet-metal members being equally subjected to a hardening operation following forming. Subsequently, at least the sliding surfaces thereof are ground to obtain both plane and sharp cutting edges. Th
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PCT/EP 94/04330, International Search Report dated Apr. 21, 1995.
Braun Product Catalog Fall 1992--English version.
Braun Product Catalog Fall 1992--German version.
Huth Dieter
Johne Karlheinz
Majthan Rudolf
Seidel Gunther
Vankov Michael
Braun Aktiengesellschaft
Payer Hwei-Siu
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