US4868985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Utility knife
Assignee: Individual
•
Filing: 1987-12-28
•
Granted: 1989-09-26
•
Expires: 2007-12-28
Abstract
Abstract A utility knife has a handle housing within which a slide bearing a knife is mounted for longitudinal displacement. Retraction means act on the knife to move it into a protected position. Turnably mounted within the housing (10) is a friction disk (22) which extends out of the handle housing (10) on the cutting-edge side of the knife blade (16). The axis of rotation (24) of said friction disk extends substantially perpendicularly to the plane of the knife blade. A driver member acts on the friction disk which advances the slide together with the knife blade into the cutting position thereof against the force of the retraction means.
Inventors
- 👤 Helmut Rehm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:16
CPC Classifications
B; B26; B26B; B26B5/00; B26B5/001; B26B5/003
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
137 words
A utility knife comprising a handle housing having an upper and lower edge (32); a slide mounted within said housing for longitudinal displacement; a knife blade having a cutting edge and connected to said slide; retraction means (18) located within said housing for retracting said slide and said knife blade (16) from a cutting position into a protected position in the handle housing; a friction disk (22) turnably mounted within said handle housing (10) and extending out of said handle housing (10) on said cutting-edge side of said knife blade (16); the axis of rotation (24) of said friction disk extending substantially perpendicularly to the plane of said blade; and a driver member for advancing said slide (12) together with said knife blade (16) into the cutting position thereof against the force of the retraction means (18).
Claim 2
Dependent Claim
137 words
A utility knife comprising a handle housing having an upper and lower edge (32); a slide mounted within said housing for longitudinal displacement; a knife blade having a cutting edge and connected to said slide; retraction means (18) located within said housing for retracting said slide and said knife blade (16) from a cutting position into a protected position in the handle housing; a friction disk (22) turnably mounted within said handle housing (10) and extending out of said handle housing (10) on said cutting-edge side of said knife blade (16); the axis of rotation (24) of said friction disk extending substantially perpendicularly to the plane of said blade; and a driver member for advancing said slide (12) together with said knife blade (16) into the cutting position thereof against the force of the retraction means (18).
Claim 3
Dependent Claim
53 words
The utility knife according to claim 1, additionally comprising a flat (26) on the outer circumference of said friction disk (22); said flat being flush, in the cutting position of the knife blade (16), with said lower edge (32) of said housing which lies on said cutting-edge side of said knife blade (16).
Claim 4
Dependent Claim
18 words
The utility knife according to claim 1, wherein the friction disk (22) is knurled on its outer periphery.
Claim 5
Dependent Claim
23 words
The utility knife according to claim 1, wherein said driver member comprises a pull wire (28) fastened eccentrically to said friction disk (22).
Claim 6
Dependent Claim
32 words
The utility knife according to claim 4, additionally comprising a cylindrical extension (38) protruding from said friction disk (22); said pull wire 28 being fastened to the outer periphery of said extension.
Claim 7
Dependent Claim
15 words
The utility knife according to claim 1, wherein said driver member comprises a toothed gearing.
Claim 8
Dependent Claim
58 words
The utility knife according to claim 6, wherein said toothed gearing comprises a transfer gearwheel (40) a toothing (42) on said friction disk (22) and a rack part (44) on said slide (12); said transfer gearwheel (40) meshing both with said toothing (42) on said friction disk (22) and with said rack part (44) on said slide (12).
Claim 9
Dependent Claim
15 words
The utility knife according to claim 1, wherein said driver member is a friction-wheel gearing.
Claim 10
Dependent Claim
36 words
The utility knife according to claim 8, wherein said friction-wheel gearing comprises a transfer friction wheel (40') in engagement both with said cylindrical extension (38) protruding from said friction disk (22) and with said slide (12).
Claim 11
Dependent Claim
15 words
The utility knife according to claim 1, wherein said drive member comprises a belt drive.
Claim 12
Dependent Claim
60 words
The utility knife according to claim 10, further comprising a friction wheel (40') in frictional contact with said slide (12) and wherein said belt drive comprises a transfer belt (46) which is wrapped over s id cylindrical extension (38) protruding from said friction disk (22) and over said friction wheel (40') which is in frictional contact with said slide (12).
References Cited (Backward Citations)
FR1346481A
Cited
US3906627A
Cited
US3999290A
Cited
US4086698A
Cited
US4139939A
Cited
US4683656A
Cited
US4523379A
Cited
US4713885A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-25 | 1993-03-27 | 1993-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-25 | 1997-03-27 | 1997-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-25 | 2001-03-27 | 2001-09-26 | $7700.00 | Window Closed / Lapsed |