Patent US3748731A successfully refreshed from Google Patents.
US3748731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coupling for shaver drive shaft and cutter
Assignee: US Philips Corp
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Filing: 1971-08-30
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Granted: 1973-07-31
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Expires: 1991-08-30
Abstract
Abstract A dry-shaver having a movable connection between the driving shaft and the cutting member, wherein the free end of the shaft is shaped as a coupling pin and provided with convexly curved lateral surfaces that fit bearingly in a prismatic aperture provided in a portion of the cutting member.
Inventors
- 👤 H Kuiken
- 👤 W Bergsma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:49
CPC Classifications
B; B26; B26B; B26B19/00; B26B19/14; B26B19/145
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
172 words
For use with a dry shaver including a housing and a drive shaft which is rotatable about an axis and has an extending free end, a shaving head securable to the housing and movable between different inclinations relative to said axis, the shaving head comprising a shear plate with outer and inner surfaces, and a cutting member having a generally rectangular aperture in the center thereof, said free end of the drive shaft engaging said aperture to function as a moving coupling, said free end defining a coupling pin formed as a curved body having (in side view) two curved ends forming arcs of a first circle extending laterally as a circular cylinder and (in end view) two curved sides forming arcs of a second circle extending laterally as a circular cylinder of smaller diameter than the first, the aperture having four walls that intersect forming eight vertices which define between them a central point, the intersection of the axes of said first and second cylinders and this central point being coincident.
Claim 2
Dependent Claim
172 words
For use with a dry shaver including a housing and a drive shaft which is rotatable about an axis and has an extending free end, a shaving head securable to the housing and movable between different inclinations relative to said axis, the shaving head comprising a shear plate with outer and inner surfaces, and a cutting member having a generally rectangular aperture in the center thereof, said free end of the drive shaft engaging said aperture to function as a moving coupling, said free end defining a coupling pin formed as a curved body having (in side view) two curved ends forming arcs of a first circle extending laterally as a circular cylinder and (in end view) two curved sides forming arcs of a second circle extending laterally as a circular cylinder of smaller diameter than the first, the aperture having four walls that intersect forming eight vertices which define between them a central point, the intersection of the axes of said first and second cylinders and this central point being coincident.
Claim 3
Dependent Claim
43 words
Apparatus according to claim 1 wherein the diameter of the first cylinder is substantially equal to the length of one side and the aperture and the diameter of the second cylinder is substantially equal to the length of one end of the aperture.
Claim 4
Dependent Claim
50 words
Apparatus according to claim 1 wherein the cutter member is adjacent and facing the inner surface of the shear plate, and the cutter member further comprises a retaining plate secured upon the upper surface and covering said aperture, the coupling pin having a tip part that engages said retaining plate.
Claim 5
Dependent Claim
54 words
Apparatus according to claim 1 wherein said coupling pin has a top surface that defines two intersecting planes, each of which also intersects one of said end parts of said pin, and two additional plane portions each of which is tangent to one side of the aperture and intersects both of said intersecting planes.
Claim 6
Dependent Claim
104 words
A dry-shaver having a driving shaft with a free end and at least one shaving head, which is actuated by said driving shaft, said shaving head comprising a shear plate capable of assuming an inclined position relative to the driving shaft and a cooperating rotatable cutting member held in engagement with the shear plate, said cutting member including a prismatic aperture therein forming a movable connection with said free end of the driving shaft, which end is shaped so as to form a coupling pin, has its sides provided with convexly curved surfaces, which fit bearingly in the prismatic aperture in the cutting member.
Claim 7
Dependent Claim
104 words
A dry-shaver having a driving shaft with a free end and at least one shaving head, which is actuated by said driving shaft, said shaving head comprising a shear plate capable of assuming an inclined position relative to the driving shaft and a cooperating rotatable cutting member held in engagement with the shear plate, said cutting member including a prismatic aperture therein forming a movable connection with said free end of the driving shaft, which end is shaped so as to form a coupling pin, has its sides provided with convexly curved surfaces, which fit bearingly in the prismatic aperture in the cutting member.
Claim 8
Dependent Claim
150 words
A dry-shaver as claimed in claim 5, characterized in that the convexly curved surfaces form part of two pairs of opposite faces, which pairs intersect one another substantially at rIght angles, the convexly curved surfaces of one pair of opposite faces forming part of a cylindrical surface of a circular cylinder having a diameter which is substantially equal to one side of the aperture provided in the cutting member, which aperture has a rectangular cross-section, and the convexly curved surfaces of the other pair of opposite faces forming part of the cylindrical surface of another circular cylinder having a diameter which is substantially equal to the other side of the rectangular aperture in the cutting member while the centers of the said cylinders and of the sphere on which lie the vertices of the rectangular aperture provided in the cutting member coincide in the assembled situation of the driving shaft.
Claim 9
Dependent Claim
146 words
A dry-shaver as claimed in claim 5, characterized in that the convexly curved surfaces form part of two pairs of opposite faces, which pairs intersect one another substantially at right angles, the convexly curved surfaces of one pair of opposite faces forming part of a cylindrical surface of a circular cylinder having a diameter which is substantially equal to one side of the aperture of rectangular cross-section provided in the cutting member, and the convexly curved surfaces of the other pair of opposite faces forming part of a cylindrical surface of another circular cylinder having a dimaeter which is substantially equal to the other side of the rectangular aperture in the cutter member, while the centers of the cylinders and of the sphere on which lie the vertices of the rectangular aperture provided in the cutting member coincide in the assembled situation of the driving shaft.
Claim 10
Dependent Claim
165 words
A dry-shaver as claimed in claim 5, characterized in that the convexly curved surfaces form part of two pairs of opposite faces, which pairs intersect one another substantially at right angles, the convexly curved surfaces of one pair of opposite faces forming part of the surface of a sphere having a diameter which is substantially equal to the longer side of the prismatic aperture provided in the cutting member, which aperture has a cross-section in the form of a rectangular parallelogram, and the convexly curved surfaces of the other pair of opposite faces forming part of a cylindrical surface of a circular cylinder having a diameter which is substantially equal to the shorter side of the said aperture provided in the cutting member, while the center of the said sphere, the center of the said cylinder and the center of the sphere on which lie the vertices of the rectangular aperture provided in the cutting member coincide in the assembled situation of the driving shaft.
Claim 11
Dependent Claim
37 words
A dry-shaver as claimed in claim 5 characterized in that the curved surfaces of the lateral faces of the coupling pin at their upper ends facing the holder portion of the cutting member terminate in plane surfaces.
Claim 12
Dependent Claim
74 words
A dry-shaver as claimed in claim 5 further comprising a plate arranged across the prismatic aperture provided in the cutting member, this plate having an inner surface in line contact with the end of the coupling pin facing this inner surface both during any movement of the cutting member relative to the driving shaft and in the stationary relative condition of these component parts, whereby the coupling pin is retained in its assembled position.
References Cited (Backward Citations)
US3399453A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |