US3852883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaving unit for safety razor
Assignee: Warner Lambert Co LLC
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Filing: 1973-12-13
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Granted: 1974-12-10
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Expires: 1993-12-13
Abstract
Abstract The specific disclosure provides a shaving unit having a spacer which includes a pair of spaced forwardly extending projections. A bottom razor blade is connected to the underside of the spacer with its cutting edge positioned beneath the projections or forwardly of the projections. A top razor blade is connected to the upperside of the spacer with its cutting edge positioned above the projections and rearwardly of the cutting edge of the bottom blade. Each one of the spacer projections includes a raised portion extending upwardly in front of a respective end of the cutting edge of the top razor blade.
Inventors
- 👤 F Ferraro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:30
CPC Classifications
B; B26; B26B; B26B21/00; B26B21/08; B26B21/14; B26B21/22; B29; B29C; B29C65/00; B29C65/56; B29C65/64; B29C65/645; B29C66/00; B29C66/70; B29C66/74; B29C66/742; B29L; B29L2031/00; B29L2031/718; B29L2031/7186
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
289 words
A replaceable shaving unit for a safety razor, wherein said razor comprises a transverse guard surface, spaced stop means for locating said shaving unit with respect to said guard surface, a blade seat member, a cap member extending forwardly above said blade seat member, and means for biasing said shaving unit in abutting engagement with said stop means and said blade seat member upwardly to clamp said shaving unit between said cap and said blade seat member, said shaving unit comprising: a. a spacer member including a transversely elongated center portion, a pair of spaced projections extending forwardly from said center portion, a raised portion on each one of said projections, an underside, and an upper side; b. a first razor blade connected to said underside, said first razor blade including a lower surface for abutting engagement with said blade seat member and an elongated cutting edge dimensioned for locating each outer end thereof behind a respective one of said stop means to prevent contact with the ends of the first blade cutting edge during use; and c. a second razor blade connected to said upper side, said second razor blade including an upper surface for abutting engagement with said cap member and an elongated cutting edge positioned above said projections and rearwardly and parallelly with the cutting edge of said bottom razor blade, the cutting edge of said second razor blade having each outer end thereof located behind and spaced rearwardly from a respective one of the raised portions to prevent contact with the ends of the second blade cutting edge during use; d. said second razor blade having a predetermined thickness, and the raised portions extending upwardly from said projections a distance less than said predetermined thickness.
Claim 2
Dependent Claim
289 words
A replaceable shaving unit for a safety razor, wherein said razor comprises a transverse guard surface, spaced stop means for locating said shaving unit with respect to said guard surface, a blade seat member, a cap member extending forwardly above said blade seat member, and means for biasing said shaving unit in abutting engagement with said stop means and said blade seat member upwardly to clamp said shaving unit between said cap and said blade seat member, said shaving unit comprising: a. a spacer member including a transversely elongated center portion, a pair of spaced projections extending forwardly from said center portion, a raised portion on each one of said projections, an underside, and an upper side; b. a first razor blade connected to said underside, said first razor blade including a lower surface for abutting engagement with said blade seat member and an elongated cutting edge dimensioned for locating each outer end thereof behind a respective one of said stop means to prevent contact with the ends of the first blade cutting edge during use; and c. a second razor blade connected to said upper side, said second razor blade including an upper surface for abutting engagement with said cap member and an elongated cutting edge positioned above said projections and rearwardly and parallelly with the cutting edge of said bottom razor blade, the cutting edge of said second razor blade having each outer end thereof located behind and spaced rearwardly from a respective one of the raised portions to prevent contact with the ends of the second blade cutting edge during use; d. said second razor blade having a predetermined thickness, and the raised portions extending upwardly from said projections a distance less than said predetermined thickness.
Claim 3
Dependent Claim
38 words
The shaving unit of claim 1, wherein said spacer member further includes a plurality of teeth between said projections, said teeth extending forwardly from said center portion for a distance less than the forward extension of said projections.
Claim 4
Dependent Claim
20 words
The shaving unit of claim 2, wherein said first razor blade further includes a plurality of perforations between said teeth.
Claim 5
Dependent Claim
80 words
The shaving unit of claim 1, wherein each one of said first and second razor blades further includes a transversely elongated slot, the slots being vertically aligned; and wherein said spacer member further includes a pair of transversely spaced posts, one of said posts extending upwardly into one end of the slot in said second razor blade, and the other of said posts extending downwardly into the end of the slot in said first razor blade opposite said one end.
Claim 6
Dependent Claim
85 words
The shaving unit of claim 4, wherein each one of said first and second razor blades further includes another transversely elongated slot, the another slots being vertically aligned; and wherein said spacer member further includes another pair of transversely spaced posts, one of said another posts extending upwardly into one side of the another slot in said second razor blade, and the other of said another posts extending downwardly into the side of the another slot in said first razor blade opposite said one side.
Claim 7
Dependent Claim
38 words
The shaving unit of claim 1, wherein said first razor blade has a Blunt rear edge positioned beneath said center portion, and wherein said second razor blade has a blunt rear edge positioned rearwardly of said center portion.
Claim 8
Dependent Claim
31 words
The shaving unit of claim 6, wherein said center portion of said spacer member includes a transverse rear surface positioned forwardly of the blunt rear edge of said second razor blade.
Claim 9
Dependent Claim
24 words
The shaving unit of claim 7, wherein said first and second razor blades have unequal distances from respective cutting edge to blunt rear edge.
Claim 10
Dependent Claim
20 words
The shaving unit of claim 7, wherein said first and second razor blades have identical length, width and thickness dimensions.
Claim 11
Dependent Claim
33 words
The shaving unit of claim 8, wherein each one of said first and second razor blades has a thickness of 0.006 inch, and wherein said spacer member has a thickness of 0.08 inch.
Claim 12
Dependent Claim
36 words
The shaving unit of claim 7, wherein the cutting edge of said second razor blade is in a horizontal plane 0.014 inch above another horizontal plane defined by the cutting edge of said first razor blade.
Claim 13
Dependent Claim
36 words
The shaving unit of claim 10, wherein a pair of vertical planes defined by the cutting edges of said first and second razor blades have a spacing therebetween of about 0.33 inch to about 0.41 inch.
Claim 14
Dependent Claim
25 words
The shaving unit of claim 1, wherein said first and second razor blades are connected to said spacer member by a plurality of spot welds.
Claim 15
Dependent Claim
35 words
The shaving unit of claim 1, wherein said first and second razor blades are connected to said spacer member by a plurality of projection welds, the weld projections being initially formed on said spacer member.
Claim 16
Dependent Claim
51 words
The shaving unit of claim 1, wherein each one of said first and second razor blades further includes a plurality of apertures, and wherein said center portion of said spacer member is deformed through said apertures to connect said first and second razor blades to said spacer member by integral rivets.
Claim 17
Dependent Claim
60 words
The shaving unit of claim 1, wherein each one of said first and second razor blades further includes a plurality of apertures, and wherein said center portion of said spacer member has a plurality of posts extending through said apertures, said posts being deformed at the outer ends thereof to connect said first and second razor blades to said spacer.
Claim 18
Dependent Claim
37 words
The shaving unit of claim 1, wherein a pair of vertical planes defined by the cutting edges of said first and second razor blades have a spacing therebetween of from about 0.035 inch to about 0.055 inch.
Claim 19
Dependent Claim
37 words
The shaving unit of claim 17, wherein a pair of horizontal planes defined by the cutting edges of said first and second razor blades have a spacing therebetween of from about 0.01 inch to about 0.026 inch.
Claim 20
Dependent Claim
41 words
The shaving unit of claim 6, wherein the distance between the cutting edge and the blunt rear edge of said second razor blade is greater than the distance between the cutting edge and the blunt rear edge of said first blade.
Claim 21
Dependent Claim
33 words
The shaving unit of claim 1, wherein the thickness of one of said second and first razor blades is less than the thickness of the other of said second and first razor blades.
References Cited (Backward Citations)
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US3262206A
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US3786563A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |