US3556384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interlocks for folding box panels
Assignee: Kliklok LLC
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Filing: 1969-05-21
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Granted: 1971-01-19
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Expires: 1989-05-21
Abstract
Abstract A glueless interlock is provided in which two arms of a threearmed star cut in one box panel define an insertion slot outlining an internal tongue which points towards the box corner, under which tongue a second panel or flap is insertable. The second panel or flap has an internal engagement slot in it, one portion of which, in fully inserted position, coincides with, and engages, a portion of the insertion slot and another portion of which coincides with, and engages, the third arm of the star cut. The third arm is of curved or angular outline adjacent the star center and forms at the that point a lock tab or tip which, when snapped past an edge of the engagement slot, maintains the coinciding edges in load-bearing engagement.
Inventors
- 👤 Chester J Pierce Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:13
CPC Classifications
B; B65; B65D; B65D5/00; B65D5/20; B65D5/30; B65D5/301; B65D5/302
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
273 words
An interlock for two corner-forming wall panels of a folding box of paperboard, one of the wall panels having a flap articulated to it along a corner fold line, said flap being foldable over, and insertable into an insertion slot in the other wall panel, the insertion slot being formed by two arms of a three-armed star cut, said two arms being so disposed as to define a tongue in said other wall pointing in a direction opposite to the direction of insertion, the third arm of the star being curved and comprising a near portion adjacent the star center, which near portion extends at an angle to the bordering edge of said tongue, said third arm further comprising a terminal portion remote from the star center, which terminal portion extends in a direction substantially in continuation of one of the said two arms of the star cut, said flap comprising an internal engagement cut, one section of which, in fully inserted position of the flap, coincides with said terminal portion of the said third arm and another section of which coincides with said one of the two arms with respect to which said remote portion forms a continuation, said angular near portion defining a lock tab at the star center pointing in the direction of insertion, which lock tab may be snapped past one of the edges of said engagement cut from a position overlying one surface of the flap to a position overlying the opposite surface of the flap, in which latter position the engagement cut is in coincidence with said terminal portion and with said one of the two arms.
Claim 2
Dependent Claim
273 words
An interlock for two corner-forming wall panels of a folding box of paperboard, one of the wall panels having a flap articulated to it along a corner fold line, said flap being foldable over, and insertable into an insertion slot in the other wall panel, the insertion slot being formed by two arms of a three-armed star cut, said two arms being so disposed as to define a tongue in said other wall pointing in a direction opposite to the direction of insertion, the third arm of the star being curved and comprising a near portion adjacent the star center, which near portion extends at an angle to the bordering edge of said tongue, said third arm further comprising a terminal portion remote from the star center, which terminal portion extends in a direction substantially in continuation of one of the said two arms of the star cut, said flap comprising an internal engagement cut, one section of which, in fully inserted position of the flap, coincides with said terminal portion of the said third arm and another section of which coincides with said one of the two arms with respect to which said remote portion forms a continuation, said angular near portion defining a lock tab at the star center pointing in the direction of insertion, which lock tab may be snapped past one of the edges of said engagement cut from a position overlying one surface of the flap to a position overlying the opposite surface of the flap, in which latter position the engagement cut is in coincidence with said terminal portion and with said one of the two arms.
Claim 3
Dependent Claim
14 words
An interlock according to claim 1 in which the engagement slot is substantially straight-linear.
Claim 4
Dependent Claim
19 words
An interlock according to claim 1 in which the engagement slot extends substantially parallel to said corner fold line.
Claim 5
Dependent Claim
92 words
An interlock according to claim 1 in which the star cut comprises a first arm substantially parallel to the corner fold line, considering the corner in assembled condition, a second arm extending from said first arm downwardly towards the box bottom and away from the corner, and a third arm extending from the star center which lies on said second arm, said third arm representing substantially a continuation of the said first arm, and in which the first arm comprises an angled terminal portion extending in a direction away from the corner.
Claim 6
Dependent Claim
81 words
An interlock according to claim 1 in which the star cut comprises a first arm, at least a portion of which extends substantially parallel to the corner fold line, considering the corner is assembled condition, a second arm extending from said first arm upwardly towards the top of the box and away from the corner, and a third arM extending from the star center, the said terminal portion of the third arm representing substantially a continuation of said first arm portion.
Claim 7
Dependent Claim
128 words
An interlock according to claim 1 in which the star cut comprises a first arm, at least a portion of which extends substantially parallel to the corner fold line, considering the corner in assembled condition, a second arm extending from said first arm upwardly towards the top of the box and away from the corner, and a third arm extending from the star center, the said terminal portion of the third arm representing substantially a continuation of said first arm portion, the third arm being an interrupted cut forming a weak severable bridge of paperboard closely adjacent said lock tab, said bridge being adapted to be severed by the snapping of said tab past said one of the edges of said engagement cut as recited in claim 1.
Claim 8
Dependent Claim
223 words
In a folding box comprising a plurality of interconnected panels forming walls of the box, at least one pair of said panels being interconnected by means of an extension of one of a pair of panels, which extension is inserted into a curved insertion slot in the other panel of said pair to an inserted end position, the curved insertion slot defining a tongue pointing in the direction substantially opposite to the direction of insertion, there being an engagement slot in said extension, which engagement slot is in coincidence with a certain section of said insertion slot in the condition of full insertion, a further section of the insertion slot being out of coincidence with the engagement slot, the improvement comprising a further slot in the said other panel communicating with said insertion slot and extending in a general direction to represent a lineal continuation of said certain section, at least a portion of said further slot being in coincidence with said engagement slot except for a tab defining section adjacent the point of junction of the further slot with the insertion slot, said tab pointing in the direction of insertion and being adapted to be snapped from a position overlying one face of said extension, past the edge of said engagement slot, into a position overlying the opposite face of said extension.
Claim 9
Dependent Claim
223 words
In a folding box comprising a plurality of interconnected panels forming walls of the box, at least one pair of said panels being interconnected by means of an extension of one of a pair of panels, which extension is inserted into a curved insertion slot in the other panel of said pair to an inserted end position, the curved insertion slot defining a tongue pointing in the direction substantially opposite to the direction of insertion, there being an engagement slot in said extension, which engagement slot is in coincidence with a certain section of said insertion slot in the condition of full insertion, a further section of the insertion slot being out of coincidence with the engagement slot, the improvement comprising a further slot in the said other panel communicating with said insertion slot and extending in a general direction to represent a lineal continuation of said certain section, at least a portion of said further slot being in coincidence with said engagement slot except for a tab defining section adjacent the point of junction of the further slot with the insertion slot, said tab pointing in the direction of insertion and being adapted to be snapped from a position overlying one face of said extension, past the edge of said engagement slot, into a position overlying the opposite face of said extension.
Claim 10
Dependent Claim
19 words
A folding box construction as defined in claim 7 in which the engagement slot is a substantially straight line.
Claim 11
Dependent Claim
49 words
A folding box construction as defined in claim 7 in which said pair of panels forms a corner, in which the engagement slot is substantially straight-linear and in which said further slot forms a substantially straight line continuation, beyond said tab, of said certain portion of the insertion slot;
Claim 12
Dependent Claim
53 words
A folding box construction as defined in claim 7 in which: a. said pair of panels forms a corner, in which; b. said extension is a flap articulated to said one panel along a corner fold line and in which; and c. said engagement slot is substantially parallel to said corner fold line.
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |