US3774300A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cutter head for dry-shavers
Assignee: US Philips Corp
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Filing: 1971-08-25
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Granted: 1973-11-27
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Expires: 1991-08-25
Abstract
Abstract Cutter head for dry shavers having a cutter head frame and a stationary upper cutter and reciprocating driven lower cutter resiliently pressed against the upper cutter. The upper cutter forms a resilient frame and has cutter teeth and the upper cutter is clamped to the cutter head frame under initial stress and with slight curvature concave towards the lower cutter.
Inventors
- 👤 R Konig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:46
CPC Classifications
B; B26; B26B; B26B19/00; B26B19/02; B26B19/04; B26B19/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
160 words
In a dry shaver cutting head including a cutting head frame, at least one lateral trimmer comprising a stationary upper cutter formed as a resilient upper cutter frame having two spaced parallel sides and two transverse end parts bridging said sides, and a row of cutter teeth on at least one of said sides, a lower cutter reciprocally movable in the direction of said sides and having teeth corresponding to and adjacent said upper cutter teeth, means for resiliently urging said lower cutter and its teeth against the upper cutter and its teeth respectively, first measn for attaching the upper cutter frame to the cutting head frame at points along said sides, second means supporting said upper cutter frame relative to said cutting head frAme at points along said transverse ends intermediate said sides, said second means engaging said cutter frame end parts in pressure contact urging same into a concave curvature, with said concave surface facing said lower cutter.
Claim 2
Dependent Claim
160 words
In a dry shaver cutting head including a cutting head frame, at least one lateral trimmer comprising a stationary upper cutter formed as a resilient upper cutter frame having two spaced parallel sides and two transverse end parts bridging said sides, and a row of cutter teeth on at least one of said sides, a lower cutter reciprocally movable in the direction of said sides and having teeth corresponding to and adjacent said upper cutter teeth, means for resiliently urging said lower cutter and its teeth against the upper cutter and its teeth respectively, first measn for attaching the upper cutter frame to the cutting head frame at points along said sides, second means supporting said upper cutter frame relative to said cutting head frAme at points along said transverse ends intermediate said sides, said second means engaging said cutter frame end parts in pressure contact urging same into a concave curvature, with said concave surface facing said lower cutter.
Claim 3
Dependent Claim
35 words
A cutting head according to claim 1, in which the frame part of the upper cutter carries the cutter teeth in a plane offset from and parallel to the remainder of said upper cutter frame.
Claim 4
Dependent Claim
153 words
A cutting head according to claim 1, in which the cutting head frame is quadrangular and consists of (i) two side parts extending parallel to the direction of reciprocation of the lower cutter, and of (ii) two transverse parts, and in which, in the region of each of the four corners of the cutting head frame, there is said first means formed as a projection extending perpendicular to the plane of the cutting head frame, these projections each having a lateral recess open outward in the direction of movement of the lower cutter for reception of the transverse parts of the upper cutter frame, said transverse parts of the cutting head frame each also having a similarly extending support projection which is said second means, and the upper cutter frame, when its transverse parts are inserted into these recesses and engaged by said support projections, being flexed and maintained in a concave state.
Claim 5
Dependent Claim
38 words
A cutting head according to claim 3 wherein said support projections are formed by a nose on each of the two transverse parts of the cutting head frame for supporting the transverse parts of the upper cutter frame.
Claim 6
Dependent Claim
65 words
A cutting head according to claim 3, in which the side parts of the upper cutter frame which extend parallel to the direction of movement of the lower cutter are clamped along two spaced lines to adjacent sides of the cutting head frame, while the support projections for supporting the transverse parts of the upper cutter frame are detachably secured to the cutting head frame.
Claim 7
Dependent Claim
99 words
A cutting head according to claim 3 wherein said upper cutter frame has a clear aperture of a given length between its transverse parts, and wherein each of said recesses has an outward facing end face, and the distance between a pair of opposite end faces of the recesses lying one behind the other in the direction of movement of the lower cutter is equal to said given length, while at least one pair of recesses lying side by side perpendicular to the direction of movement of the lower cutter are provided with a further depression in stair form.
Claim 8
Dependent Claim
38 words
A cutting head according to claim 3, in which the inner edges of the side parts of the upper cutter frame which extend parallel to the direction of movement of the lower cutter lie immediately beside said projections.
Claim 9
Dependent Claim
45 words
A cutting head according to claim 7, in which, in at least the projections of one of the two pairs of projections aligned one with the other in the direction of movement of the lower cutter, are closer together than projections of the other pair.
Claim 10
Dependent Claim
24 words
A cutting head according to claim 4, in which the noses facing normal to the direction of movement of the lower cutter, are bevelled.
Claim 11
Dependent Claim
33 words
A cutting head according to claim 5, wherein said cutting head frames transverse parts have engaging projections, and said second means comprise U-shaped brackets having apertures therein for resiliently engaging said engaging projections.
Claim 12
Dependent Claim
20 words
A cutting head according to claim 1, further comprising springs which press said lower cutter against the upper cutter frame.
Claim 13
Dependent Claim
38 words
A cutting head according to claim 1, further comprising said positioning projections on the cutter head frame, and corresponding apertures in the upper cutter frame, for engaging and positioning the upper cutter frame relative to cutter head frame.
References Cited (Backward Citations)
US2975516A
Cited
US3456341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |