US3967375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Razor construction
Assignee: Individual
•
Filing: 1975-03-03
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Granted: 1976-07-06
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Expires: 1995-03-03
Abstract
Abstract The invention contemplates a razor-handle construction of such elemental simplicity as to be fabricated as a single integral molded-plastic part, with end-lug formations contoured to removably receive and assemble to the central region of the back-edge of certain razor-blade subassemblies, including presently commercial subassemblies. In the disclosed embodiments, the handle is a sheath in which the razor-blade subassembly is self-packaged and readily accessible for assembly to the lug formations, being then correctly oriented for use.
Inventors
- 👤 Edward J. Hoffschmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:45
CPC Classifications
B; B26; B26B; B26B21/00; B26B21/40; B26B21/52; B26B21/521; B26B21/4012; B26B21/4031
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
340 words
In combination, an elongated generally polygonally prismatic sheath having a hollow generally prismatic interior open to one of the sides of said sheath, the sectional extent of said open side being of at least the sectional extent of the interior to which access is had via said open side; and a razor-blade subassembly comprising blade means with and a rigid back permanently supporting said blade means with at least one elongate straight cutting edge positioned for a shaving cut, said back defining between front and back faces blade-mounting means at and adjacent to a back edge parallel to said cutting edge, the overall length, width and thickness dimensions of said subassembly substantially conforming to the length, width and thickness dimensions of the interior of said sheath, whereby the subassembly is removably insertable in said sheath via said open side; at least one of the longitudinal-end sides of said sheath being closed and including a hooked lug formation of width substantially coextensive with the width dimension of said sheath and defining a razor-mounting opening having an inner-wall contour integrally formed with one longitudinal-end side of said sheath and substantially matching the longitudinally central sectional contour of said subassembly at least at the region thereof which includes said back edge and at adjacent portions of said front and back faces, the outermost end of said lug formation defining with the opposed inner-wall contour a blade-clamping span which is no greater than the lug-overlapped local effective thickness of said back edge region when the back edge of said blade assembly is received in said hooked lug formation, said blade-mounting means and said lug formation having interengaging means detachably retaining their assembled relationship and including a centrally recessed front-face wall formation adjacent said back edge, the longitudinal extent of said recessed wall formation being substantially the effective width of that part of said lug formation which is engageable therewith, whereby the full effective width of the sheath itself provides relatively wide-based and stabilized support of said blade assembly when retained by said lug formation.
Claim 2
Dependent Claim
340 words
In combination, an elongated generally polygonally prismatic sheath having a hollow generally prismatic interior open to one of the sides of said sheath, the sectional extent of said open side being of at least the sectional extent of the interior to which access is had via said open side; and a razor-blade subassembly comprising blade means with and a rigid back permanently supporting said blade means with at least one elongate straight cutting edge positioned for a shaving cut, said back defining between front and back faces blade-mounting means at and adjacent to a back edge parallel to said cutting edge, the overall length, width and thickness dimensions of said subassembly substantially conforming to the length, width and thickness dimensions of the interior of said sheath, whereby the subassembly is removably insertable in said sheath via said open side; at least one of the longitudinal-end sides of said sheath being closed and including a hooked lug formation of width substantially coextensive with the width dimension of said sheath and defining a razor-mounting opening having an inner-wall contour integrally formed with one longitudinal-end side of said sheath and substantially matching the longitudinally central sectional contour of said subassembly at least at the region thereof which includes said back edge and at adjacent portions of said front and back faces, the outermost end of said lug formation defining with the opposed inner-wall contour a blade-clamping span which is no greater than the lug-overlapped local effective thickness of said back edge region when the back edge of said blade assembly is received in said hooked lug formation, said blade-mounting means and said lug formation having interengaging means detachably retaining their assembled relationship and including a centrally recessed front-face wall formation adjacent said back edge, the longitudinal extent of said recessed wall formation being substantially the effective width of that part of said lug formation which is engageable therewith, whereby the full effective width of the sheath itself provides relatively wide-based and stabilized support of said blade assembly when retained by said lug formation.
Claim 3
Dependent Claim
51 words
The combination of claim 1, wherein the projecting end of said lug formation is relatively more resiliently bendable than any other part thereof, said span in the unstressed condition being less than the said local effective thickness, whereby razor-blade subassembly to the lug formation of said sheath may be resiliently retained.
Claim 4
Dependent Claim
59 words
The combination of claim 1, in which said blade subassembly includes bonded blade-mounting means defining said back edge and adjacent portions of said front and back faces, said contour being such as to incline said blade means at an acute angle to the longitudinal direction of said sheath when said blade subassembly is assembled to said hook-shaped lug formation.
Claim 5
Dependent Claim
14 words
The combination of claim 3, in which said blade-mounting means is of molded plastic.
Claim 6
Dependent Claim
65 words
The combination of claim 3, in which said blade-mounting means includes an elongated guard member offset from and parallel to the cutting edge of said blade, the geometric plane which includes said cutting edge and said guard member defining a relatively more sharply acute angle than the acute angle of said blade with respect to said longitudinal direction when assembled to said hook-shaped lug formation.
Claim 7
Dependent Claim
30 words
The combination of claim 5, wherein said contour defines a blade-subassembly support angle with respect to said longitudinal direction, said support angle being intermediate said first and second acute angles.
Claim 8
Dependent Claim
23 words
The combination of claim 1, wherein said open side is at the longitudinal sheath end opposite the end having said hook-shaped lug formation.
Claim 9
Dependent Claim
25 words
The combination of claim 1, wherein said open side is one of the longitudinally extending sheath sides adjacent the end having said hook-shaped lug formation.
Claim 10
Dependent Claim
323 words
In combination, an elongated integral single-piece generally prismatic molded-plastic sheath having a hollow generally prismatic interior open to one of the sides of said sheath, the sectional extent of said open side being of at least the sectional extent of the interior to which access is had via said open side; and a razor-blade subassembly comprising blade means and a rigid back permanently united to and supporting said blade means with at least one elongate straight cutting edge positioned and exposed for a shaving cut, said back defining between front and back faces blade-mounting means at and adjacent to a back edge parallel to said cutting edge, one of said faces having a central locking recess offset from said back edge, the overall length, width and thickness dimensions of said subassembly conforming to the length, width and thickness dimensions of the interior of said sheath, whereby the subassembly is removably insertable in said sheath via said open side; at least one of the longitudinal-end sides of said sheath being closed and including a hooked lug formation of width substantially coextensive with the width dimension of said sheath and defining a razor-mounting opening having an inner-wall contour integrally formed with one longitudinal-end side of said sheath and substantially matching the longitudinally central sectional contour of said subassembly at least at the region thereof which includes said back-edge and at adjacent portions of said front and back faces, the outermost end of said lug formation defining with the opposed inner-wall contour a blade-clamping span which is no greater than the lug-overlapped local effective thickness of said blade-mounting means when the back edge of said blade assembly is received in said hooked lug formation, and said sheath having at the lug-formed end thereof a centrally located integral detent formation projecting within said span and positioned for razor-retaining register with said recess when the longitudinally central back-edge region of said razor-blade subassembly is fitted to said contour.
Claim 11
Dependent Claim
323 words
In combination, an elongated integral single-piece generally prismatic molded-plastic sheath having a hollow generally prismatic interior open to one of the sides of said sheath, the sectional extent of said open side being of at least the sectional extent of the interior to which access is had via said open side; and a razor-blade subassembly comprising blade means and a rigid back permanently united to and supporting said blade means with at least one elongate straight cutting edge positioned and exposed for a shaving cut, said back defining between front and back faces blade-mounting means at and adjacent to a back edge parallel to said cutting edge, one of said faces having a central locking recess offset from said back edge, the overall length, width and thickness dimensions of said subassembly conforming to the length, width and thickness dimensions of the interior of said sheath, whereby the subassembly is removably insertable in said sheath via said open side; at least one of the longitudinal-end sides of said sheath being closed and including a hooked lug formation of width substantially coextensive with the width dimension of said sheath and defining a razor-mounting opening having an inner-wall contour integrally formed with one longitudinal-end side of said sheath and substantially matching the longitudinally central sectional contour of said subassembly at least at the region thereof which includes said back-edge and at adjacent portions of said front and back faces, the outermost end of said lug formation defining with the opposed inner-wall contour a blade-clamping span which is no greater than the lug-overlapped local effective thickness of said blade-mounting means when the back edge of said blade assembly is received in said hooked lug formation, and said sheath having at the lug-formed end thereof a centrally located integral detent formation projecting within said span and positioned for razor-retaining register with said recess when the longitudinally central back-edge region of said razor-blade subassembly is fitted to said contour.
Claim 12
Dependent Claim
27 words
The combination of claim 9, wherein said detent formation is on the part of said contour which is opposite the projecting end of said hook-shaped lug formation.
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) | 1979-07-06 | 1980-01-05 | 1980-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-06 | 1984-01-05 | 1984-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-06 | 1988-01-05 | 1988-07-06 | $7700.00 | Window Closed / Lapsed |