US4707915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry-shaving apparatus with angled blades
Assignee: US Philips Corp
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Filing: 1986-12-16
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Granted: 1987-11-24
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Expires: 2006-12-16
Abstract
Abstract A dry-shaving apparatus comprises a housing having a holder for a shear plate with hair-entry apertures and a cutter which is rotatable about an axis of rotation and which comprises a carrier for cutting elements which are movable relative to the carrier, in which during rotation of the cutter, as part of a revolution, each point of a cutting edge at the end of a cutting element follows a constrained path which is defined by the shear plate and each point of a cutting edge follows a circular free path when the ends are clear of the shear plate. At the more advanced axial end of the first cutting element, viewed in the direction of rotation, the radius of a circular free path of the cutting edge is smaller than the distance from the axis of rotation to the corresponding portion of the shear plate at the location where at this end the free path changes into the constrained path, so that the cutter comes gradually into contact with the shear plate.
Inventors
- 👤 Eppe Bakker
- 👤 Albert Hoekstra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:53
CPC Classifications
B; B26; B26B; B26B19/00; B26B19/14; B26B19/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
215 words
A dry shaving apparatus comprising a housing having a holder for a shear plate formed with hair-entry apertures and a cutter which is rotatable about an axis of rotation, which cutter comprises a carrier with cutting elements which are movable relative to the carrier and which at their radial ends each comprise a cutting edge which extends between two axial ends of the cutting element, one axial end being more advanced in the direction of rotation than the other axial end, and which cutter is partly surrounded by the shear plate, every point of a cutting edge at the end of a cutting element of the cutter, as it rotates, following, as part of a revolution a constrained path defined by the shear plate and every point of a cutting edge following a circular free path about the axis of rotation when the radial ends are clear of the shear plate, characterized in that viewed in the direction of rotation at the more advanced axial end of the cutting element the radius of a circular free path of the cutting edge is smaller than the distance from the axis of rotation to the corresponding portion of the shear plate at the location where at said axial end the free path changes into the constrained path.
Claim 2
Dependent Claim
215 words
A dry shaving apparatus comprising a housing having a holder for a shear plate formed with hair-entry apertures and a cutter which is rotatable about an axis of rotation, which cutter comprises a carrier with cutting elements which are movable relative to the carrier and which at their radial ends each comprise a cutting edge which extends between two axial ends of the cutting element, one axial end being more advanced in the direction of rotation than the other axial end, and which cutter is partly surrounded by the shear plate, every point of a cutting edge at the end of a cutting element of the cutter, as it rotates, following, as part of a revolution a constrained path defined by the shear plate and every point of a cutting edge following a circular free path about the axis of rotation when the radial ends are clear of the shear plate, characterized in that viewed in the direction of rotation at the more advanced axial end of the cutting element the radius of a circular free path of the cutting edge is smaller than the distance from the axis of rotation to the corresponding portion of the shear plate at the location where at said axial end the free path changes into the constrained path.
Claim 3
Dependent Claim
42 words
A shaving apparatus as claimed in claim 1, characterized in that in the free path the cutting edges of the cutting elements are disposed on a conical surface and the curved portion of the shear plate is shaped as a cylindrical surface.
Claim 4
Dependent Claim
42 words
A shaving apparatus as claimed in claim 1, characterized in that in the free path the cutting edges of the cutting elements are disposed on a cylindrical surface and the curved portion of the shear plate is shaped as a conical surface.
Claim 5
Dependent Claim
23 words
A shaving apparatus as claimed in claim 1, characterized in that the cutting elements are manufactured as flat components of a sheet material.
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) | 1990-11-23 | 1991-05-25 | 1991-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-23 | 1995-05-25 | 1995-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-23 | 1999-05-25 | 1999-11-24 | $7700.00 | Window Closed / Lapsed |