US4177560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety knife
Assignee: Individual
•
Filing: 1978-08-08
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Granted: 1979-12-11
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Expires: 1998-08-08
Abstract
Abstract A safety knife with basic features of a switchblade knife comprising a pair of side plates, a blade, an interplate and a pin, wherein the blade has a locking slot at a top and another locking slot at a bottom thereof, a rack insertion hole and an opening in which a shaft pin provided with gear is fixed, the rack insertion hole having such a size and being provided in such a portion of said blade that a rack can travel smoothly therethrough engaging with the gear provided around the shaft pin, and the interplate has a spring portion and a locking claw at the end of the spring portion, said locking claw being to interact with the locking slots.
Inventors
- 👤 Hiroshi Sakurai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:00
CPC Classifications
B; B26; B26B; B26B1/00; B26B1/02; B26B1/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
113 words
A safety knife comprising a pair of side plates, a blade, an interplate and a pin, wherein said blade has a locking slot at a top and another locking slot at a bottom thereof, a rack insertion hole and an opening in which a shaft pin provided with gear is fixed, said rack insertion hole having such a size and being provided in such a portion of said blade that a rack can travel smoothly therethrough engaging with the gear provided around said shaft pin, and said interplate has a spring portion and a locking claw at the end of said spring portion, said locking claw being to interact with said locking slots.
Claim 2
Dependent Claim
113 words
A safety knife comprising a pair of side plates, a blade, an interplate and a pin, wherein said blade has a locking slot at a top and another locking slot at a bottom thereof, a rack insertion hole and an opening in which a shaft pin provided with gear is fixed, said rack insertion hole having such a size and being provided in such a portion of said blade that a rack can travel smoothly therethrough engaging with the gear provided around said shaft pin, and said interplate has a spring portion and a locking claw at the end of said spring portion, said locking claw being to interact with said locking slots.
Claim 3
Dependent Claim
46 words
A safety knife according to claim 1, wherein said pin comprises a male part and a female part and a head portion of said male and female parts from a knob thereby allowing an operator to grab said knob to rotate said blade around said pin.
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) | 1982-12-10 | 1983-06-11 | 1983-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-10 | 1987-06-11 | 1987-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-10 | 1991-06-11 | 1991-12-11 | $7700.00 | Window Closed / Lapsed |