End construction for bellows type envelopes and the like

Claim 2

An end construction for a bellows-type envelope comprising a sheet having an outward and inward surface, a front wall, a bottom wall, and a back wall defined by first inward fold lines on a sheet, side walls defined by second inward fold lines on a sheet, said side walls defining a continuous longitudinal flap on both sides of the front wall, bottom wall and back wall, isosceles triangles defined by third inward fold lines on the side walls, the third inward fold lines being astride the first inward fold lines, and latitudinal extensions coextensive with a portion of each flap and defined by outward longitudinal fold lines, the flaps being folded over respective front, bottom and back walls, the front and back wall folded over in registration with each other and the bottom wall folded outwardly upon itself, the opposing faces on the outward side of each of the triangles being folded together and secured together, the latitudinal extension being secured to said continuous flaps at portions not coextensive with said latitudinal extensions.

Claim 3

The end construction according to claim 1, and a medial outward latitudinal fold line on the bottom wall.

Claim 4

An end construction for a belLows type envelope comprising a sheet having an inward and outward side, three latitudinal fold lines on the sheet, the first and third being inward fold lines defining between them, a bottom for the envelope, and said inward latitudinal fold lines further defining the front and back of the envelope; and the second fold line being an outward fold line defining an outwardly bending fold in the center of the bottom of the envelope, a longitudinal inward fold on each side edge of the sheet extending the length of said sheet, said inward folds defining flaps constituting expandable side walls for the envelope, isosceles triangular areas defined by inward fold lines, each on opposite sides of the second latitudinal fold line, each triangle having an altitude in registration with one of the longitudinal fold lines, each triangle having a base lying on an edge of the flap and a base angle of each triangle terminating on the middle latitudinal fold line at the edge of the flap, each half of one isosceles triangle on one side of the triangles altitude being attached to the opposite half thereof on the other side of the altitude, whereby when the expandable end wall is disposed with the portions on either side of the middle latitudinal fold, in the same plane, the side walls will be extended generally perpendicular to the front and back portions, a latitudinal extension on a portion of the flaps defined by outward longitudinal fold lines, the extensions being attached to the corresponding opposite portion of the flaps.

Claim 5

An end construction for a belLows type envelope comprising a sheet having an inward and outward side, three latitudinal fold lines on the sheet, the first and third being inward fold lines defining between them, a bottom for the envelope, and said inward latitudinal fold lines further defining the front and back of the envelope; and the second fold line being an outward fold line defining an outwardly bending fold in the center of the bottom of the envelope, a longitudinal inward fold on each side edge of the sheet extending the length of said sheet, said inward folds defining flaps constituting expandable side walls for the envelope, isosceles triangular areas defined by inward fold lines, each on opposite sides of the second latitudinal fold line, each triangle having an altitude in registration with one of the longitudinal fold lines, each triangle having a base lying on an edge of the flap and a base angle of each triangle terminating on the middle latitudinal fold line at the edge of the flap, each half of one isosceles triangle on one side of the triangles altitude being attached to the opposite half thereof on the other side of the altitude, whereby when the expandable end wall is disposed with the portions on either side of the middle latitudinal fold, in the same plane, the side walls will be extended generally perpendicular to the front and back portions, a latitudinal extension on a portion of the flaps defined by outward longitudinal fold lines, the extensions being attached to the corresponding opposite portion of the flaps.

Claim 6

An expansible envelope comprising: a one piece blank including a substantially rectangular front panel, a back panel coextensive with and hingedly depending from the lower edge of said front panel by inboard and outboard bottom gusset panels defined by transversely extending triple score lines, an inboard gusset panel hinged to each of the lateral edges of said front panel along corresponding inboard longitudinally extending score lines, a gusset section coextensive with and hinged to each of the lateral edges of said back panel along an extension of the corresponding inboard longitudinally extending score line, said inboard and outboard bottom gusset panels, said inboard side gusset panels and said gusset sections all being substantially equal in width along a dimension perpendicular to the respective hinged score lines thereof, a flap substantially coextensive with and hinged to the lower edge of each of said inboard side gusset panels along extensions of the inboard transverse score line and being further hinged to each of the lateral edges of said inboard bottom gusset panel along extensions of the corresponding inboard longitudinally extending score line, a tab substantially coextensive with and hinged to the adjacent edge of each of said gusset sections along extensions of the outboard transverse score line and being further hinged to each of the lateral edges of said outboard bottom gusset panel along extensions of the corresponding inboard longitudinally extending score line, said flaps and said tabs being respectively hinged to each other along extensions of the intermediate transverse score line, a top sealing flap hinged to the upper edge of said front panel, and an outboard side gusset panel hinged to the lateral edge of each of said inboard side gusset panels along a corresponding outboard longitudinally extending score line and having a lower edge terminating at a position short of the inboard transverse score line by a space substantially equal to the width of one of said gusset panels to define a clearance below said outboard side gusset panels, said inboard side gusset panels, said flaps, said tabs and said gusset sections being inwardly folded along the corresponding inboard longitudinally extending score line, said outboard side gusset panels being then outwardly folded along the corresponding outboard longitudinally extending score line, said bottom gusset panels and said back panel being inwardly, outwardly and then inwardly folded along the tranSverse triple score lines, and said gusset sections being adhesively secured to the corresponding underlying outboard gusset panels and portions of said flaps and tabs being adhesively secured to each other whereby all gussets are interiorly folded with closed corners.

Claim 7

An expansible envelope comprising: a one piece blank including a substantially rectangular front panel, a back panel coextensive with and hingedly depending from the lower edge of said front panel by inboard and outboard bottom gusset panels defined by transversely extending triple score lines, an inboard gusset panel hinged to each of the lateral edges of said front panel along corresponding inboard longitudinally extending score lines, a gusset section coextensive with and hinged to each of the lateral edges of said back panel along an extension of the corresponding inboard longitudinally extending score line, said inboard and outboard bottom gusset panels, said inboard side gusset panels and said gusset sections all being substantially equal in width along a dimension perpendicular to the respective hinged score lines thereof, a flap substantially coextensive with and hinged to the lower edge of each of said inboard side gusset panels along extensions of the inboard transverse score line and being further hinged to each of the lateral edges of said inboard bottom gusset panel along extensions of the corresponding inboard longitudinally extending score line, a tab substantially coextensive with and hinged to the adjacent edge of each of said gusset sections along extensions of the outboard transverse score line and being further hinged to each of the lateral edges of said outboard bottom gusset panel along extensions of the corresponding inboard longitudinally extending score line, said flaps and said tabs being respectively hinged to each other along extensions of the intermediate transverse score line, a top sealing flap hinged to the upper edge of said front panel, and an outboard side gusset panel hinged to the lateral edge of each of said inboard side gusset panels along a corresponding outboard longitudinally extending score line and having a lower edge terminating at a position short of the inboard transverse score line by a space substantially equal to the width of one of said gusset panels to define a clearance below said outboard side gusset panels, said inboard side gusset panels, said flaps, said tabs and said gusset sections being inwardly folded along the corresponding inboard longitudinally extending score line, said outboard side gusset panels being then outwardly folded along the corresponding outboard longitudinally extending score line, said bottom gusset panels and said back panel being inwardly, outwardly and then inwardly folded along the tranSverse triple score lines, and said gusset sections being adhesively secured to the corresponding underlying outboard gusset panels and portions of said flaps and tabs being adhesively secured to each other whereby all gussets are interiorly folded with closed corners.

Claim 8

An expansible envelope comprising a one piece blank including a substantially rectangular front panel, a back panel coextensive with and hingedly depending from the lower edge of said front panel by inboard and outboard bottom gusset panels defined by transversely extending triple score lines, an inboard side gusset panel hinged to each of the lateral edges of said front panel along corresponding inboard longitudinally extending score lines, a gusset section coextensive with and hinged to each of the lateral edges of said back panel along an extension of the corresponding inboard longitudinally extending score line, said inboard and outboard bottom gusset panels, said inboard side gusset panels and said gusset sections all being substantially equal in width along a dimension perpendicular to the respective hinged score lines thereof, a flap substantially coextensive with and hinged to the lower edge of each of said inboard side gusset panels along extensions of the inboard transverse score line and being further hinged to each of the lateral edges of said inboard bottom gusset panel along extensions of the corresponding inboard longitudinally extending score line, a tab substantially coextensive with and hinged to the adjacent edge of each of said gusset sections along extensions of the outboard transverse score line and being further hinged to each of the lateral edges of said outboard bottom gusset panel along extensions of the corresponding inboard longitudinally extending score line, said flaps and said tabs being respectively hinged to each other along extensions of the intermediate transverse score line, and an outboard side gusset panel hinged to the lateral edge of said inboard side gusset panels along a corresponding outboard longitudinally extending score line and having a lower edge terminating at a position short of the inboard transverse score line by a space substantially equal to the width of one of said gusset panels to define a clearance below said outboard side gusset panels, said inboard side gusset panels, said flaps, said tabs and said gusset sections being inwardly folded along the corresponding inboard longitudinally extending score line, said outboard side gusset panels being then outwardly folded along the corresponding outboard longitudinally extending score line, said bottom gusset panels and said back panel being inwardly, outwardly and then inwardly folded along the transverse triple score lines, and said gusset sections being adhesively secured to the corresponding underlying outboard gusset panels and portions of said flaps and tabs being adhesively secured to each other whereby all gussets are interiorly folded with closed corners.

Claim 9

An expansible envelope comprising a one piece blank including a substantially rectangular front panel, a back panel coextensive with and hingedly depending from the lower edge of said front panel by inboard and outboard bottom gusset panels defined by transversely extending triple score lines, an inboard side gusset panel hinged to each of the lateral edges of said front panel along corresponding inboard longitudinally extending score lines, a gusset section coextensive with and hinged to each of the lateral edges of said back panel along an extension of the corresponding inboard longitudinally extending score line, said inboard and outboard bottom gusset panels, said inboard side gusset panels and said gusset sections all being substantially equal in width along a dimension perpendicular to the respective hinged score lines thereof, a flap substantially coextensive with and hinged to the lower edge of each of said inboard side gusset panels along extensions of the inboard transverse score line and being further hinged to each of the lateral edges of said inboard bottom gusset panel along extensions of the corresponding inboard longitudinally extending score line, a tab substantially coextensive with and hinged to the adjacent edge of each of said gusset sections along extensions of the outboard transverse score line and being further hinged to each of the lateral edges of said outboard bottom gusset panel along extensions of the corresponding inboard longitudinally extending score line, said flaps and said tabs being respectively hinged to each other along extensions of the intermediate transverse score line, and an outboard side gusset panel hinged to the lateral edge of said inboard side gusset panels along a corresponding outboard longitudinally extending score line and having a lower edge terminating at a position short of the inboard transverse score line by a space substantially equal to the width of one of said gusset panels to define a clearance below said outboard side gusset panels, said inboard side gusset panels, said flaps, said tabs and said gusset sections being inwardly folded along the corresponding inboard longitudinally extending score line, said outboard side gusset panels being then outwardly folded along the corresponding outboard longitudinally extending score line, said bottom gusset panels and said back panel being inwardly, outwardly and then inwardly folded along the transverse triple score lines, and said gusset sections being adhesively secured to the corresponding underlying outboard gusset panels and portions of said flaps and tabs being adhesively secured to each other whereby all gussets are interiorly folded with closed corners.

Claim 10

A bellows-type envelope comprising a blank having an inward side and an outward side, said blank having a first latitudinal score line adapted to provide an outward folding thereof, and two further latitudinal score lines parallel to and equidstant from said first score line, said two further latitudinal score lines being adapted to provide an inward folding of said blank to define a front panel, a back panel and a bottom panel, said bottom panel being disposed between said two further latitudinal score lines, first longitudinal score lines adapted to provide an inward fold and define side panels, and triangular score lines adapted to provide an inward folding of the blank and define two isosceles triangles in each side panel, said triangles being astride said further latitudinal score lines, and two further longitudinal score lines adapted to provide an outward folding of said blank and define flaps coextensive with a portion of each of said panels, each side panel being folded inwardly said outside surface of said triangles having adhesiVe applied thereto said triangular surfaces being folded into each other to secure same.

Claim 11

A bellows-type envelope comprising a blank having an inward side and an outward side, said blank having a first latitudinal score line adapted to provide an outward folding thereof, and two further latitudinal score lines parallel to and equidstant from said first score line, said two further latitudinal score lines being adapted to provide an inward folding of said blank to define a front panel, a back panel and a bottom panel, said bottom panel being disposed between said two further latitudinal score lines, first longitudinal score lines adapted to provide an inward fold and define side panels, and triangular score lines adapted to provide an inward folding of the blank and define two isosceles triangles in each side panel, said triangles being astride said further latitudinal score lines, and two further longitudinal score lines adapted to provide an outward folding of said blank and define flaps coextensive with a portion of each of said panels, each side panel being folded inwardly said outside surface of said triangles having adhesiVe applied thereto said triangular surfaces being folded into each other to secure same.

Claim 12

An envelope as claimed in claim 6, wherein each triangle defined by said score lines includes a base and altitude, said altitude being in registration with the further latitudinal score line that said triangle is astride of, and the base of each triangle being a side edge of said side panel.

Claim 13

An envelope as claimed in claim 6, wherein said flaps are coextensive with said side panels defined by said further longitudinal score lines with a portion of said side panel terminating at a point where the triangular score line intersects the side panel.

Claim 14

An envelope as claimed in claim 6, wherein said blank includes a cover panel defined by a third latitudinal score line to foldably hinge said cover panel to one of said front and back panels.

Claim 15

An envelope as claimed in claim 6, adhesive is disposed on the inward surface of said flaps and said flaps are secured to a portion of the outward surface of the side panel not coextensive therewith.