US4690018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Razor blade assembly and its method of manufacture
Assignee: Warner Lambert Co LLC
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Filing: 1985-09-18
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Granted: 1987-09-01
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Expires: 2005-09-18
Abstract
Abstract This invention concerns a razor blade assembly in which a double edge blade strip 9, which subsequently provides first and second blades 10,16 of a twin bladed assembly, is provided, in an insert moulding operation, with a blade platform 11, end walls 15, a guard bar 14 and a blade spacer 13 moulded on the first blade 10, and a top cap 17, end walls 22, a spacer 18 and rivets 20 moulded on the second blade 16. After cropping of the metal joining the two blades or after folding over one blade on to the other, the rivets 20 are brought into apertures 21 in the first blade 10 and blade platform 11 to locate the two blades with their edges parallel and in staggered mutual relationship. Finally the portions of the rivets 20 projecting through the blade platform 11 are flattened to permanently lock the two parts of the assembly together.
Inventors
- 👤 David S. Duncan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:37
CPC Classifications
B; B26; B26B; B26B21/00; B26B21/02; B26B21/06; B29; B29C; B29C65/00; B29C65/02; B29C65/08; B29C65/56; B29C65/60; B29C65/606; B29L; B29L2031/00; B29L2031/718; B29L2031/7186; Y; Y10; Y10S; Y10S76/00; Y10S76/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
133 words
A method for the manufacture of a razor blade assembly which comprises forming cutting edges of first and second blades, molding a blade platform and guard bar on to said first blade, molding a top cap on to said second blade, locating the second blade above and parallel spaced from the first blade with the cutting edges of the blades parallel to one another and in mutually staggered relationship, and securing the blades rigidly with respect to one another, which method further comprises molding a blade spacer and rivets on the second blade, the spacer and top cap being formed on opposite sides of the second blade, inserting the rivets in holes provided in the first blade and blade platform and forming heads on the portions of the rivets projecting through said holes.
Claim 2
Independent Claim
133 words
A method for the manufacture of a razor blade assembly which comprises forming cutting edges of first and second blades, molding a blade platform and guard bar on to said first blade, molding a top cap on to said second blade, locating the second blade above and parallel spaced from the first blade with the cutting edges of the blades parallel to one another and in mutually staggered relationship, and securing the blades rigidly with respect to one another, which method further comprises molding a blade spacer and rivets on the second blade, the spacer and top cap being formed on opposite sides of the second blade, inserting the rivets in holes provided in the first blade and blade platform and forming heads on the portions of the rivets projecting through said holes.
Claim 3
Independent Claim
159 words
A method for the manufacture of a razor blade assembly which comprises forming cutting edges on first and second blades, molding a blade platform and guard bar on to said first blade, molding a top cap on to said second blade, locating the second blade above and parallel spaced from the first blade with the cutting edges of the blades parallel to one another and in mutually staggered relationship, and securing the blades rigidly with respect to one another, wherein a double edge blade is formed having first and second edge portions said blade platform and guard bar being molded on said first edge portion and said top cap being molded on said second edge portion, the two portions of the double edge blade forming the first and second blades of the finished blade assembly being rotated through 180° relative to one another to bring the second edge portion into a superimposed position relative to the first edge portion.
Claim 4
Independent Claim
159 words
A method for the manufacture of a razor blade assembly which comprises forming cutting edges on first and second blades, molding a blade platform and guard bar on to said first blade, molding a top cap on to said second blade, locating the second blade above and parallel spaced from the first blade with the cutting edges of the blades parallel to one another and in mutually staggered relationship, and securing the blades rigidly with respect to one another, wherein a double edge blade is formed having first and second edge portions said blade platform and guard bar being molded on said first edge portion and said top cap being molded on said second edge portion, the two portions of the double edge blade forming the first and second blades of the finished blade assembly being rotated through 180° relative to one another to bring the second edge portion into a superimposed position relative to the first edge portion.
Claim 5
Dependent Claim
29 words
A method according to claim 2 wherein the first and second blade edge portions are severed from one another prior to the portions being rotated relative to one another.
Claim 6
Dependent Claim
29 words
A method according to claim 2 wherein the second blade edge portion is folded over relative to said first portion to bring the two portions into said superimposed position.
References Cited (Backward Citations)
US3724070A
Cited
US3879844A
Cited
GB1593979A
Cited
FR2457155A1
Cited
US4302876A
Cited
EP0116520A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-31 | 1991-03-02 | 1991-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-31 | 1995-03-02 | 1995-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-31 | 1999-03-02 | 1999-09-01 | $7700.00 | Window Closed / Lapsed |