US4811484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry-shaving apparatus
Assignee: US Philips Corp
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Filing: 1988-06-08
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Granted: 1989-03-14
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Expires: 2008-06-08
Abstract
Abstract A dry-shaving apparatus comprises a housing; a longitudinally extending shear plate; a holder for the shear plate, the holder being removable from the housing; and a longitudinally extending cutter rotatable relative to the shear plate. The cutter includes a carrier having cutting elements movable in a substantially radial direction relative to the carrier. Each cutting element has a cutting edge at its radial end, such radial ends being in contact with the shear plate during only a part of a revolution of the cutter and being clear of other parts of the apparatus during another part of the cutter revolution. A guide wall provided on the housing adjoins the shear plate, the radial ends of the cutting elements also being in contact during a further part of the cutter revolution with such guide wall.
Inventors
- 👤 Willem S. Wijma
- 👤 Eduard W. Tietjens
- 👤 Eppe Bakker
- 👤 Albert Hoekstra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:43
CPC Classifications
B; B26; B26B; B26B19/00; B26B19/14; B26B19/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
246 words
A dry-shaving apparatus comprising a housing; a longitudinally extending shear plate; a holder for the shear plate, said holder being removable from the housing; a longitudinally extending cutter rotatable relative to the shear plate and including a carrier having cutting elements movable in a substantially radial direction relative to the carrier; the shear plate having a central portion shaped as a part of a circularly cylindrical surface and two peripheral portions respectively adjoining the central portion; the shear plate having a first transition between one peripheral portion and its central portion, a cutting edge of each cutting element at its radial end changing from a free path to a constrained path in the vicinity of the first shear-plate transition, and having a second shear-plate transition between the other peripheral portion and its central portion, a cutting edge of each cutting element at its radial end changing from a constrained path to a free path in the vicinity of the second shear-plate transition; each cutting element having a cutting edge at its radial end, and at least one guide wall provided on the housing and adjoining the shear plate forming a part of at least one transition between said constrained and free path, the radial ends of the cutting elements also being in contact during a further part of the cutter revolution with said guide wall whereby cutting elements enter and leave the transitions reducing the effects of collisions between the cutting elements and the shear plate.
Claim 2
Dependent Claim
246 words
A dry-shaving apparatus comprising a housing; a longitudinally extending shear plate; a holder for the shear plate, said holder being removable from the housing; a longitudinally extending cutter rotatable relative to the shear plate and including a carrier having cutting elements movable in a substantially radial direction relative to the carrier; the shear plate having a central portion shaped as a part of a circularly cylindrical surface and two peripheral portions respectively adjoining the central portion; the shear plate having a first transition between one peripheral portion and its central portion, a cutting edge of each cutting element at its radial end changing from a free path to a constrained path in the vicinity of the first shear-plate transition, and having a second shear-plate transition between the other peripheral portion and its central portion, a cutting edge of each cutting element at its radial end changing from a constrained path to a free path in the vicinity of the second shear-plate transition; each cutting element having a cutting edge at its radial end, and at least one guide wall provided on the housing and adjoining the shear plate forming a part of at least one transition between said constrained and free path, the radial ends of the cutting elements also being in contact during a further part of the cutter revolution with said guide wall whereby cutting elements enter and leave the transitions reducing the effects of collisions between the cutting elements and the shear plate.
Claim 3
Dependent Claim
50 words
A dry-shaving apparatus according to claim 1, in which the housing has guide walls adjoining the shear plate on opposite sides of the rotatable cutter forming a part of the transition between the constrained path to the free path and the transition between the free path to the constrained path.
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) | 1992-03-13 | 1992-09-12 | 1993-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-13 | 1996-09-12 | 1997-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-13 | 2000-09-12 | 2001-03-14 | $7700.00 | Window Closed / Lapsed |