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US3558037A Expired / Lapsed US ⏱️ 0.0 years remaining

Locking device for egg cartons

Assignee: Atlantic Richfield Co
•
Filing: 1969-05-09
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Granted: 1971-01-26
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Expires: 1989-05-09
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Abstract

Abstract A locking device for an egg carton having an integrally hinged tray and cover. The locking device includes a U-shaped and longitudinally extending bar having a first leg hinged to the front of a protruding lip on the bottom of the cover''s front wall and extending downwardly in front of the tray when the bar is in locked position; a bottom leg extending rearwardly from the bottom of the first leg; and a second leg extending upwardly from the inner edge of the bottom leg. The carton is locked shut by pivoting the bar under a protruding lip on the top of the tray''s front wall and wedging the free longitudinal edge of the bar''s second leg into the angular channel between the tray''s front wall and its protruding lip.

Inventors

  • 👤 James M Andrews

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 19:09
CPC Classifications
B; B65; B65D; B65D85/00; B65D85/30; B65D85/32; B65D85/324

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 230 words
An egg carton comprising a bottom section having a frontwall and a rearwall; a cover section having a frontwall and a rearwall, the cover and bottom sections'' rear walls being hingedly connected so that the cover section can assume a closed superimposed position with respect to the bottom section; a first protruding lip extending along at least a portion of the upper edge of the bottom section''s frontwall, said lip forming an angular locking channel with the outer surface of the bottom section''s frontwall; a second protruding lip along a corresponding portion of the bottom edge of the cover section''s frontwall, the protruding lips being in substantial abutting engagement with one another when the sections are in closed position; and a U-shaped and longitudinally locking bar comprising: a. a first leg hinged along its top longitudinal edge to the forward edge of the cover section''s protruding lip permitting the locking flap to be pivoted between locked and unlocked positions, said first leg extending downwardly in front of the bottom section when the bar is in locked position; b. a bottom leg extending rearwardly from the bottom longitudinal edge of the first leg; and c. a second leg extending upwardly from the inner longitudinal edge of the bottom leg, said second leg being wedged into the angular locking channel when the bar is in locked position to hold the sections together.
Claim 2
Dependent Claim 230 words
An egg carton comprising a bottom section having a frontwall and a rearwall; a cover section having a frontwall and a rearwall, the cover and bottom sections'' rear walls being hingedly connected so that the cover section can assume a closed superimposed position with respect to the bottom section; a first protruding lip extending along at least a portion of the upper edge of the bottom section''s frontwall, said lip forming an angular locking channel with the outer surface of the bottom section''s frontwall; a second protruding lip along a corresponding portion of the bottom edge of the cover section''s frontwall, the protruding lips being in substantial abutting engagement with one another when the sections are in closed position; and a U-shaped and longitudinally locking bar comprising: a. a first leg hinged along its top longitudinal edge to the forward edge of the cover section''s protruding lip permitting the locking flap to be pivoted between locked and unlocked positions, said first leg extending downwardly in front of the bottom section when the bar is in locked position; b. a bottom leg extending rearwardly from the bottom longitudinal edge of the first leg; and c. a second leg extending upwardly from the inner longitudinal edge of the bottom leg, said second leg being wedged into the angular locking channel when the bar is in locked position to hold the sections together.
Claim 3
Dependent Claim 16 words
The carton of claim 1, wherein the carton and locking bar are of unitary molded construction.
Claim 4
Dependent Claim 17 words
The carton of claim 2, wherein the carton and locking bar are formed of molded polystyrene foam.
Claim 5
Dependent Claim 49 words
The carton of claim 1, including a longitudinal locking flange extending outwardly from the upper longitudinal edge of the locking bar''s second leg, said locking flange being wedged into the angular locking channel between the bottom section''s frontwall and its protruding lip when the bar is in locked position.
Claim 6
Dependent Claim 28 words
The carton of claim 1, including rib means interconnecting the frontwall of the bottom section and its protruding lip to reinforce the angular relation of the locking channel.
Claim 7
Dependent Claim 70 words
The carton of claim 5, in which the rib means includes a front flange extending downwardly from the forward edge of the bottom section''s projecting lip and side flanges extending downwardly from the ends of the projecting lip, said side flanges interconnecting the front flange with the frontwall of the bottom section and being spaced apart a sufficient distance to permit the locking bar to be pivoted into locked position.
Claim 8
Dependent Claim 21 words
The carton of claim 6, including a horizontal rib extending outwardly from the bottom edge of said front and side flanges.
Claim 9
Dependent Claim 56 words
The carton of claim 1, including laterally extending flanges on the upper and lower edges of the walls of the bottom and cover sections, respectively, said flanges being coextensive with the projecting lips on the frontwalls of said sections and being in substantial flush load-bearing engagement with one another when the sections are in closed position.

References Cited (Backward Citations)

US3349989A Cited
US3506182A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1974-01-25 1974-07-27 1975-01-26 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-01-25 1978-07-27 1979-01-26 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-01-25 1982-07-27 1983-01-26 $7700.00 Window Closed / Lapsed

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