US4086698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety guard for the blade of carton openers
Assignee: Unifi Inc
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Filing: 1977-02-28
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Granted: 1978-05-02
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Expires: 1997-02-28
Abstract
Abstract A blade guard is mounted to a conventional carton cutter for longitudinal, reciprocal movement between a "safe" position outwardly of and covering the tip of the cutter blade and a retracted position spaced inwardly from and exposing the tip and a portion of the blade. The guard is normally spring biased to the safe position, yet responsive to pressure against the carton wall to retract the guard until it passes the end of the carton wall in front of the blade.
Inventors
- 👤 William F. Sparks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:43
CPC Classifications
B; B26; B26B; B26B27/00; B26B27/005; B26B29/00; B26B29/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
161 words
In combination with a carton cutter of the type having a handle formed of complimentary sides and a cutting blade disposed between said sides and protruding longitudinally from one end of said handle a prescribed distance, an improved cutter guard comprising: (a) a guard means attached to said handle and including a shoe movable in a longitudinal path between an extended, safe position wherein said shoe protrudes from said handle a distance at least as great as said prescribed distance and closely adjacent to the tip end of said blade and a second, retracted position in which said blade tip is exposed, said movement of the guard means from said first to said second position being responsive to initiation of a cutting action by said blade against a given surface; (b) said longitudinal path of said guard means being parallel to and closely adjacent the exposed sharp edge of said blade with said shoe preceding said blade during a cutting stroke.
Claim 2
Dependent Claim
161 words
In combination with a carton cutter of the type having a handle formed of complimentary sides and a cutting blade disposed between said sides and protruding longitudinally from one end of said handle a prescribed distance, an improved cutter guard comprising: (a) a guard means attached to said handle and including a shoe movable in a longitudinal path between an extended, safe position wherein said shoe protrudes from said handle a distance at least as great as said prescribed distance and closely adjacent to the tip end of said blade and a second, retracted position in which said blade tip is exposed, said movement of the guard means from said first to said second position being responsive to initiation of a cutting action by said blade against a given surface; (b) said longitudinal path of said guard means being parallel to and closely adjacent the exposed sharp edge of said blade with said shoe preceding said blade during a cutting stroke.
Claim 3
Dependent Claim
87 words
The improved cutter guard according to Claim 1 wherein said guard means includes a tubular housing attached to said handle, a shaft extending parallel to said cutter blade and received within said housing for reciprocal movement, said shoe attached to the free end of said shaft, and a spring within said housing and engaging said shaft for normally biasing said shoe to said safe position, the bias applied by said spring being overcome by the pressure required to penetrate and slit a carton wall with said cutter.
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) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |