US3844034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry shaver
Assignee: Robert Krups GmbH and Co KG
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Filing: 1973-01-26
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Granted: 1974-10-29
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Expires: 1993-01-26
Abstract
Abstract A shear foil is mounted on a housing and located within the latter is a vibratory system including a cutter unit reciprocable beneath and relative to the shear foil, an electrically energized drive including a vibratory armature and a connection from the same to the cutter unit. The vibratory system has an inherent vibratory frequency. An arrangement is provided for accommodating this inherent vibratory frequency to the frequency of the electric current with which the drive is energized.
Inventors
- 👤 K Limberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:14
CPC Classifications
B; B26; B26B; B26B19/00; B26B19/28; B26B19/282; B26B19/284
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
149 words
In a dry shaver, a combination comprising a housing; a shear foil on said housing; a vibratory system in said housing and including a cutter unit comprising a plurality of cutter blades, said unit being reciprocable beneath and relative to said shear foil, an electrically energized drive including an oscillating arm connected with a lower side of said unit for effecting reciprocation of the same, and including a vibratory armature, and springs engaging said armature and being flexible in a direction of movement of the latter, said vibratory system having an inherent vibratory frequency; and means, comprising releasable elements releasably connected with said unit, to vary the combined mass thereof and thereby change the inherent vibratory frequency of said system, so as to accommodate said inherent vibratory frequency to the frequency of the electric current by which said drive is energized by varying the mass of said cutter unit.
Claim 2
Dependent Claim
149 words
In a dry shaver, a combination comprising a housing; a shear foil on said housing; a vibratory system in said housing and including a cutter unit comprising a plurality of cutter blades, said unit being reciprocable beneath and relative to said shear foil, an electrically energized drive including an oscillating arm connected with a lower side of said unit for effecting reciprocation of the same, and including a vibratory armature, and springs engaging said armature and being flexible in a direction of movement of the latter, said vibratory system having an inherent vibratory frequency; and means, comprising releasable elements releasably connected with said unit, to vary the combined mass thereof and thereby change the inherent vibratory frequency of said system, so as to accommodate said inherent vibratory frequency to the frequency of the electric current by which said drive is energized by varying the mass of said cutter unit.
Claim 3
Dependent Claim
31 words
A combination as defined in claim 1, said plurality of cutter blades further comprising carriers for the same; and wherein said releasable elements are connectable with and disconnectable from said carriers.
Claim 4
Dependent Claim
24 words
A combination as defined in claim 1, wherein said means comprises at least one holdeR surrounding said arm and clampingly engageable with said unit.
Claim 5
Dependent Claim
36 words
A combination as defined in claim 1, said unit including a plurality of cutter blades, and carriers for the same; and wherein said holder comprises recesses arranged to frictionally receive at least one of said carriers.
Claim 6
Dependent Claim
21 words
A combination as defined in claim 1, wherein said holder is of a synthetic plastic material of at least some resiliency.
Claim 7
Dependent Claim
38 words
A combination as defined in claim 1, said holder having a pair of spaced parallel side walls provided with depressions; and further comprising elements mounted in said depressions symmetrically with reference to a center plane of said holder.
Claim 8
Dependent Claim
65 words
A combination as defined in claim 6, said holder also having a pair of spaced parallel end walls and a bottom wall connecting said end walls and provided with a central opening, said bottom wall being conically tapered in direction from said end walls to said central opening; and further comprising a coupling connecting said unit with said arm and extending through said central opening.
Claim 9
Dependent Claim
37 words
A combination as defined in claim 1, said unit including a plurality of cutter blades, and hollow carriers for the same; and wherein said means comprises elements dimensioned for releasable accommodation in the interior of said carriers.
Claim 10
Dependent Claim
44 words
A combination as defined in claim 1, wherein said means comprises at least one additional cutter unit similar to the first-mentioned unit but having a mass different from that of said first-mentioned unit and being connected in place of the same with said drive.
Claim 11
Dependent Claim
45 words
A combination as defined in claim 1, wherein one of said cutter units comprises a plurality of cutter blades and solid cross-section carriers for the same, and wherein the other cutter unit comprises a plurality of cutter blades and hollow cross-section carriers for the same.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |