Cutlery – Razors – With cooperating shearing blades
Reexamination Certificate
1998-04-24
2001-10-30
Peterson, Kenneth E. (Department: 3724)
Cutlery
Razors
With cooperating shearing blades
C030S224000
Reexamination Certificate
active
06308415
ABSTRACT:
FIELDS OF THE INVENTION
The invention relates to an apparatus for cutting hairs, having a toothed cutting device which comprises a first toothed cutter with a first cutter-tooth row, which extends in a tooth row direction and comprises a plurality of cutter teeth, and a second toothed cutter with a second cutter-tooth row, which also extends in the tooth row direction and comprises a plurality of cutter teeth, and in which: (1) both toothed cutters are reciprocatingly drivable relative to one another in accordance with a given stroke; (2) both toothed cutters lie against one another in the area of their cutter-tooth vows and (3) both toothed cutters have at least one supporting limb each in their areas which, in directions transverse to the tooth row direction, are remote from the cutter tooth rows, which supporting limbs face one another pairwise and each have a given dimension in the tooth row direction, and (4) one of the two toothed cutters carries an intermediate element of a low-friction material, which intermediate element comprises at least one intermediate element portion interposed between two facing supporting limbs, via which portion the at least one supporting limb of this one toothed cutter acts upon the at least one supporting limb of the other toothed cutter and has a given dimension in the tooth row direction.
The invention further relates to a toothed cutting device for an apparatus for cutting hairs, which toothed cutting device comprises a first toothed cutter with a first cutter-tooth row, which extends in a tooth row direction and comprises a plurality of cutter teeth, and a second toothed cutter with a second cutter-tooth row, which also extends in the tooth row direction and comprises a plurality of cutter teeth, and in which: (1) both toothed cutters are reciprocatingly drivable relative to one another in accordance with a given stroke and in (2) both toothed cutters lie against one another in the area of their cutter-tooth rows (3) both toothed cutters have at least one supporting limb each in their areas which, in directions transverse to the tooth row direction, are remote from the cutter tooth rows, which supporting limbs face one another pairwise and each have a given dimension in the tooth row direction, and (4) of the two toothed cutters carries an intermediate element of a low-friction material, which intermediate element comprises at least one intermediate element portion interposed between two facing supporting limbs, via which portion the at least one supporting limb of this one toothed cutter acts upon the at least one supporting limb of the other toothed cutter and has a given dimension in the tooth row direction.
BACKGROUND OF THE INVENTION
An apparatus of the type defined in the first paragraph and a toothed cutting device of the type defined in the second paragraph are known, for example, from the document DE 26 46 818 A1. In the known apparatus and in the known toothed cutting device the two toothed cutters each have a single supporting limb in their areas which are remote from the rows of cutter teeth in directions transverse to the tooth row direction, which limbs have exactly the same dimension in the tooth row direction, which dimension corresponds to the overall length of each of the two cutters. In the known apparatus and in the known toothed cutting device the intermediate element of a low-friction material is connected to the non-drivable toothed cutter, which is stationary in operation. The intermediate element consists of a synthetic material. Owing to the fact that in the known apparatus and in the known toothed cutting device the intermediate element carried by one toothed cutter, i.e. the stationary toothed cutter, and the supporting limb of the other toothed cutter, i.e. the drivable toothed cutter, have the same dimensions in the tooth row direction, the successively recurring situation arises that in operation each of the two end portions of the supporting limb, which are spaced apart in the tooth row direction, come into contact with the intermediate element carried by the stationary toothed cutter, and is subsequently moved over the intermediate element up to and beyond the end of this element. This process leads to abrasion of the intermediate element by the end portions of the supporting limb of the drivable toothed cutter, as a result of which the toothed cutting device becomes soiled in the area of the two supporting limbs and the intermediate element, which abraded material may get between the intermediate element carried by the stationary toothed cutter and the supporting limb of the drivable toothed cutter, which gives rise to an undesirable increase of the friction between the intermediate element and the supporting limb of the drivable toothed cutter. Moreover, as a result of the abrasion of the intermediate element at its two ends the surface pressure between the intermediate element and the supporting limb of the drivable toothed cutter in the central area of these two parts of the toothed cutting device increases comparatively strongly, which also gives rise to an undesirable increase of the friction between these two parts.
SUMMARY OF THE INVENTION
An object of the invention is to preclude the above problems and to improve an apparatus of the type defined in the first paragraph and a toothed cutting device of the type defined in the second paragraph and provide an improved apparatus and a toothed cutting device, in which the friction between the intermediate element carried by one of the two toothed cutters and the supporting limb of the other one of the two toothed cutters does not increase even after a long time of use.
According to the invention, in order to achieve the above object an apparatus of the type defined in the first paragraph is characterized in that the at least one intermediate element portion of the intermediate element carried by one of the two toothed cutters has a smaller dimension in the toothed cutter direction than the at least one supporting limb of the other one of the two toothed cutters, which last-mentioned supporting limb faces the at least one intermediate element portion. As a result of these measures in accordance with the invention, it is achieved in a very simple manner and without any additional investment, i.e. at low cost, that during operation of the apparatus the ends of a supporting limb of a toothed cutter do not come into contact with an intermediate element portion of the intermediate element carried by a toothed cutter or, if there is contact, it is only to such a small extent that no abrasion of an intermediate element portion by the free ends of a supporting limb occurs. Consequently there is no abraded material of the intermediate element and thus no soiling of the toothed cutting device in the area of an intermediate element portion and of the supporting limb lying at the intermediate element portion. Thus possible drawbacks which would lead to an increased friction between a portion of the intermediate element and a supporting limb which cooperates with such a portion of the intermediate element are precluded.
In an apparatus in accordance with the invention having a toothed cutting device which comprises a first toothed cutter with a first cutter-tooth row, which extends in a tooth row direction and comprises a plurality of cutter teeth, and a second toothed cutter with a second cutter-tooth row, which also extends in the tooth row direction and comprises a plurality of cutter teeth, and in which both toothed cutters are reciprocatingly drivable relative to one another in accordance with a given stroke, in which both tooted cutters lie against one another in the area of their cutter-tooth rows, in which both toothed cutters have at least one supporting limb each in their areas which, in directions transverse to the tooth row direction, are remote from the cutter tooth rows, which supporting limbs face one another pairwise and each have a given dimension in the tooth row direction,
and in which one of the two toothed cutters carries an intermediate elemen
Sablatschan Siegfried
Tautscher Manfred
Bartlett Ernestine C.
Peterson Kenneth E.
Spain Norman N.
U.S. Philips Corporation
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