Patent US3863338A successfully refreshed from Google Patents.
US3863338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric shaver with cutters mounted in end to end alignment
Assignee: Gillette Co LLC
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Filing: 1972-07-20
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Granted: 1975-02-04
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Expires: 1992-07-20
Abstract
Abstract An electric shaver comprising two cutter sections mounted in aligned end-to-end relationship; the cutter sections being mounted for linear reciprocation in said aligned end-to-end relationship; with substantially the same natural frequency of reciprocation; a driving motor; the driving motor is operable to reciprocate the respective cutter sections in antiphase at said natural frequency of reciprocation.
Inventors
- 👤 Roger Paul Wellinger
- 👤 Francis Andre Vauthier
- 👤 Alberto Botta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:14
CPC Classifications
B; B26; B26B; B26B19/00; B26B19/28; B26B19/288; B26B19/02; B26B19/04
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
191 words
An electric shaver comprising: at least two cutter sections movably mounted aligned with each other and in end-to-end relationship; drive means including a motor having a rotary output shaft; transmission means including a crank coupled to and driven by said motor shaft, said crank having a pair of devices for converting the rotary motion of said motor shaft to a linear motion, said pair of devices being coupled to said at least two cutter sections for linearly driving said at least two aligned cutter sections in end-to-end linear reciprocation, respectively in antiphase; and support means including mountings coupled to and resiliently supported each cutter section, each mounting including a spring, the spring constants (K1,K2) of the mounting springs being selected in relation to the masses (M1, M2) of the respective cutter sections so that Square Root K1/M1 is substantially equal to Square Root K2/M2 , so that the at least two cutter sections have substantially the same natural frequency of reciprocation; said motor being operable under power to simultaneously drive said movable cutter sections via said transmission means substantially continuously at a frequency of reciprocation substantially equal to said natural frequency.
Claim 2
Dependent Claim
191 words
An electric shaver comprising: at least two cutter sections movably mounted aligned with each other and in end-to-end relationship; drive means including a motor having a rotary output shaft; transmission means including a crank coupled to and driven by said motor shaft, said crank having a pair of devices for converting the rotary motion of said motor shaft to a linear motion, said pair of devices being coupled to said at least two cutter sections for linearly driving said at least two aligned cutter sections in end-to-end linear reciprocation, respectively in antiphase; and support means including mountings coupled to and resiliently supported each cutter section, each mounting including a spring, the spring constants (K1,K2) of the mounting springs being selected in relation to the masses (M1, M2) of the respective cutter sections so that Square Root K1/M1 is substantially equal to Square Root K2/M2 , so that the at least two cutter sections have substantially the same natural frequency of reciprocation; said motor being operable under power to simultaneously drive said movable cutter sections via said transmission means substantially continuously at a frequency of reciprocation substantially equal to said natural frequency.
Claim 3
Dependent Claim
25 words
An electric shaver according to claim 1, wherein the at least two movable cutter sections each comprise movable inner cutters cooperating with an outer foil.
Claim 4
Dependent Claim
13 words
An electric shaver according to claim 2, wherein said outer foil is stationary.
Claim 5
Dependent Claim
67 words
An electric shaver according to claim 1, comprising two movable cutter sections and wherein said supporting means for the two cutter seCtions comprises a pair of leaf springs having at least two arms projecting from a common root, at least one arm being secured at its free end to one section and at least one other arm being secured at its free end to the other section.
Claim 6
Dependent Claim
15 words
An electric shaver according to claim 1, wherein said motor is a battery powered motor.
Claim 7
Dependent Claim
22 words
An electric shaver according to claim 1, wherein said pair of devices comprises a pair of crank throws coupled to said crank.
Claim 8
Dependent Claim
150 words
An electric shaver comprising: two cutter sections movably mounted in alignment in end-to-end relationship; means for resiliently mounting the cutter sections for linear reciprocation in said aligned end-to-end relationship, said mounting means including resilient structures defining a natural rest position for each cutter section at substantially the centre of its path of linear reciprocation; driving means including a motor having a rotary output shaft; and transmission means including a crank coupled to and driven by said motor shaft, said crank having a pair of devices for converting the rotary motion of said motor shaft to a linear motion, said pair of devices being coupled to said cutter sections so as to substantially continuously and simultaneously linearly reciprocate the respective cutter sections in antiphase such that the cutter sections linearly move simultaneously towards and away from each other alternately and always pass substantially simultaneously through their said respective natural rest positions.
Claim 9
Dependent Claim
150 words
An electric shaver comprising: two cutter sections movably mounted in alignment in end-to-end relationship; means for resiliently mounting the cutter sections for linear reciprocation in said aligned end-to-end relationship, said mounting means including resilient structures defining a natural rest position for each cutter section at substantially the centre of its path of linear reciprocation; driving means including a motor having a rotary output shaft; and transmission means including a crank coupled to and driven by said motor shaft, said crank having a pair of devices for converting the rotary motion of said motor shaft to a linear motion, said pair of devices being coupled to said cutter sections so as to substantially continuously and simultaneously linearly reciprocate the respective cutter sections in antiphase such that the cutter sections linearly move simultaneously towards and away from each other alternately and always pass substantially simultaneously through their said respective natural rest positions.
Claim 10
Dependent Claim
30 words
An electric shaver according to claim 7, wherein the mounting means comprises one or more spring mountings which imparts to the two cutter sections a common natural frequency of reciprocation.
Claim 11
Dependent Claim
27 words
An electric shaver according to claim 7, wherein the driving means operates to drive both cutter sections at or close to their common natural frequency of reciprocation.
Claim 12
Dependent Claim
16 words
An electric shaver according to claim 7, wherein said driving means includes a battery powered motor.
Claim 13
Dependent Claim
22 words
An electric shaver according to claim 7, wherein said pair of devices comprises a pair of crank throws coupled to said crank.
Claim 14
Dependent Claim
176 words
An electric shaver comprising: at least two cutter sections movably mounted aligned with each other and in end-to-end relationship; drive means including a motor having a rotary output shaft; transmission means including a crank coupled to and driven by said motor shaft and a pair of crank throws driven by said crank and being coupled to said at least two cutter sections for driving said at least two cutter sections in end-to-end reciprocation, respectively in antiphase; and support means including mountings coupled to and resiliently supporting each cutter section, each mounting including a spring, the spring constants (K1, K2) of the mounting springs being selected in relation to the masses (M1, M2) of the respective cutter sections so that square root K1/M1 is substantially equal to square root K2/M2 , so that the at least two cutter sections have substantially the same natural frequency of reciprocation; said motor being operable under power to simultaneously drive said movable cutter sections via said transmission means substantially continuously at a frequency of reciprocation substantially equal to said natural frequency.
Claim 15
Dependent Claim
176 words
An electric shaver comprising: at least two cutter sections movably mounted aligned with each other and in end-to-end relationship; drive means including a motor having a rotary output shaft; transmission means including a crank coupled to and driven by said motor shaft and a pair of crank throws driven by said crank and being coupled to said at least two cutter sections for driving said at least two cutter sections in end-to-end reciprocation, respectively in antiphase; and support means including mountings coupled to and resiliently supporting each cutter section, each mounting including a spring, the spring constants (K1, K2) of the mounting springs being selected in relation to the masses (M1, M2) of the respective cutter sections so that square root K1/M1 is substantially equal to square root K2/M2 , so that the at least two cutter sections have substantially the same natural frequency of reciprocation; said motor being operable under power to simultaneously drive said movable cutter sections via said transmission means substantially continuously at a frequency of reciprocation substantially equal to said natural frequency.
Claim 16
Dependent Claim
24 words
An electric shaver according to claim 12, wherein at least the two movable cutter sections comprise movable inner cutters cooperating with an outer foil.
Claim 17
Dependent Claim
67 words
An electric shaver according to claim 12, comprising two movable cutter sections and wherein said supporting means for the two cutter sections comprises a pair of leaf springs having at least two arms projecting from a common root, at least one arm being secured at its free end to one section and at least one other arm being secured at its free end to the other section.
Claim 18
Dependent Claim
13 words
An electric shaver according to claim 13, wherein said outer foil is stationary
Claim 19
Dependent Claim
15 words
An electrIc shaver according to claim 12, wherein said motor is a battery powered motor.
Claim 20
Dependent Claim
133 words
An electric shaver comprising: two cutter sections movably mounted in alignment in end-to-end relationship; means for resiliently mounting the cutter sections for linear reciprocation in said aligned end-to-end relationship, said mounting means including resilient structures defining a natural rest position for each cutter section at substantially the centre of its path of linear reciprocation; and driving means including a motor having a rotary output shaft; and transmission means coupled to and driven by said motor shaft, and a pair of crank throws driven by said crank and being coupled to said cutter sections so as to substantially continuously and simultaneously reciprocate the respective cutter sections in antiphase such that the cutter sections move simultaneously towards and away from each other alternately and always pass substantially simultaneously through their said respective natural rest positions.
Claim 21
Dependent Claim
133 words
An electric shaver comprising: two cutter sections movably mounted in alignment in end-to-end relationship; means for resiliently mounting the cutter sections for linear reciprocation in said aligned end-to-end relationship, said mounting means including resilient structures defining a natural rest position for each cutter section at substantially the centre of its path of linear reciprocation; and driving means including a motor having a rotary output shaft; and transmission means coupled to and driven by said motor shaft, and a pair of crank throws driven by said crank and being coupled to said cutter sections so as to substantially continuously and simultaneously reciprocate the respective cutter sections in antiphase such that the cutter sections move simultaneously towards and away from each other alternately and always pass substantially simultaneously through their said respective natural rest positions.
Claim 22
Dependent Claim
16 words
An electric shaver according to claim 17, wherein said driving means includes a battery powered motor.
Claim 23
Dependent Claim
30 words
An electric shaver according to claim 17, wherein the mounting means comprises one or more spring mountings which impart to the two cutter sections a common natural frequency of reciprocation.
Claim 24
Dependent Claim
27 words
An electric shaver according to claim 17, wherein the driving means operates to drive both cutter sections at or close to their common natural frequency of reciprocation.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |