US2944727A

US2944727A - Carton with snap-lock closure

Info

Publication number: US2944727A
Application number: US636665A
Authority: US
Inventors: Norman H Moore
Original assignee: Fibreboard Paper Products Corp
Current assignee: Fibreboard Paper Products Corp
Priority date: 1957-01-28
Filing date: 1957-01-28
Publication date: 1960-07-12
Anticipated expiration: 1977-07-12

Description

July 12, 1960 N. H. MOORE CARTON WITH SNAP-LOCK CLOSURE 6 Sheets-Sheet 1 Filed Jan. 28, 1957 INVENTOR Norman H Moore Attorneys July 12, 1960 N. H. MbORE 2,944,727

CARTON WITH SNAP-LOCK CLOSURE Filed Jan. 28, 1957 6 Sheets-Sheet 2 i I oooo F i 3 i 26 l I l l fflv34 o I I 27- I 27 34 36/1 I E 26 P36 \2 6 4l/ oooo --oo0o- T I l F i g. 4

INVEN TOR. Norman H. Moore W Attorneys July 12, 1960 N. H. MOORE CARTON WITH SNAP-LOCK CLOSURE 6 Sheets-Sheet 3 Filed Jan. 28, 1957 INVENTOR. Norman H. Moore Attorneys July 12, 1960 N. H. MOORE CARTON WITH SNAP-LOCK'CLOSURE 6 Sheets-Sheet 4 Filed Jan. 28, 1957 INVENTOR Norman H Moore Attorneys July 12, 1960 N. H. MOORE CARTON WITH SNAP-LOCK CLOSURE 6 Sheets-Sheet 5 Filed Jan. 28, 1957 INVENTOR Norman h. Moore July 12, 1960 N. H. MOORE 2,944,727

CARTON WITH SNAP-LOCK CLOSURE Filed Jan. 28, 1957 6 Sheets-Sheet 6 7/ INVENTOR. I

7/0 Norman H Moore 3 WWW Attorneys 3 Claims, c1. na -45y This invention relates to. a carton that, has a snap:

nited States Patentv Patented.- July 12,. 1960 iice 2 ing: flapsof; the. main body part into the openings inthe closurezpart.

Thisssnap-lock: construction provides a carton that. is much simpler and. quicker to close. than the cartonswith stapledzclosure,parts-which:were previously employed for similar purposes. Furthermore, the carton is readily stacked and shipped; because of its rectangular configuration" and; strength;v In addition, although the-snap-lock is? firmagainstpressurefrom within the carton due... to the weight of the product, the consumer canreasily open the cartonby 'pullingthelockingflaps out of the openings in the: closure-part to. enable the closure part to bev separated from the mainbody part. Once-the closure part lock closure, and more particularly to acarton formed from: suitable-material such as paperboard, in. which. a closure part for an open mouthin the. main. body part of the-carton is quickly. andsecurely lockedrinplace. by. a snap-lock arrangement. I e

To summarize thisinvention, theca'rton hereofhasa main body part composed of. aco ver panel and upright Walls connected-to the. cover. panel; with/the. outeredges of theupright walls defining. an openmoutha A; closure part. is secured within the,- open: mouth-byv meansofi a locking flap that is hingedly connected, toanouter edge of an upright wall and whichextends into an. opening in the closure part so that. portions of the closure part overlie and underlie the lockingflap.

By employing. a snap-lock,construction in which. a

portion of the closurepart disposed inwardlyof the-hinged connection of the locking flap-pressesI outwardly'against the locking flap adjacent the hinged connection, and-the free end of the locking flap passes throughanopening inthe closure part so-that a.- portion ofthe closure part presses inwardly against the free end of the locking flap, an excellent lock is obtained that holds the closure part securely within the mouth. Pressure withinthe carton against the closure part istransmittedto thezlockingflap adjacent its hinged connection, and thefree end portion of the locking flap extending through the opening inthe closure part is in turn held in place-by the closure part portion lying outwardlyof the free end portion of the locking flap in the open mouth thereby practically holding the closure part in place by its own bootstraps. As used herein the terms inwardly and outwardly means inwardly or outwardly with respect to the open mouth of the main'body part.

Most advantageously the carton is utilized in the form of a two piece construction in'which the main body-part has, been-removed, the-main body part serves as a convenient-basket in which unused portions of .the product 7 can .be: stored.

1 Referring to-the drawings with referenceto which this invention is described. in greater detail: ,;Eig,.1. is: a plan view of apaperboard blank from which the mainbody part of. apreferred embodiment of the cartonis formed, the viewbeing of the inside surfaces ofthe'main body forming part. I

1 Fig. 2 is a planviewaof a blank of the closure part for the main body part of Fig. 1.

Fig 3 isa planview of the collapsed main body part formed-from theblank of Fig. 1, the view taken facing the collapsed walls.. i p

Fig. 4 is .a' section of the collapsed main body part of the carton taken in a. plane indicated by line 4-4. in Fig. 3.

Fig. 5' is anexploded isometric view of, the carton showing, the closure part poised above the open mouth of the main body. part; r

Fig, 6 is' an isometric view of the carton. with. the closure part covering the open mouth of the main body part, and some of the locking flaps inserted within the openings. in the closure part.

Fig; 7 is an exploded isometric view of the set up carton with the cover panel of the main body part facing and the closure part are each formed from separate blanks. A carton of this type isparticularlyusefulfor packing products, such as fruits and vegetables, for -ship:-' ment and sale to the consumer in order to reduce handling of the packaged product before it reaches the consumer, and provides an attractive package for the product. Consequently, it is highly desirable that such a carton be'easy to set up and pack'without the use'of complicated machinery, and that the cartonbe strongly locked. and of.-sufiicientstrength and suitable construction tocnable the packed carton to be shipped without damaging the contents of the carton.

Alsc for convenience in storing and, shipping the carton before it is packed, the. main body partofthe carbon is desirably of a collapsible construction that can be shipped flat, and the side walls merely unfolded to provide upright walls hingcdly connected to a cover panel; When the packer has raised the. uprightwalls to provide an open mouth and the product has been. packed, the closure part is quickly and easily secured. merely by placing it within the open mouth and snapping the lock? upwardly, and the window flaps of the main body part removed above the carton to .show the manner in which the packaged product may be displayed.

Fig. 8' is a fragmentary vertical section through a locking'flap inserted within the opening in the closure part, the view being taken in a planeindicated by line 8-8 in Fig. 6.

Fig.- 9'is a plan-view of'an alternate paperboard blank from which the main body part of the carton may be formed, the view being of the inside surfaces of the main body forming part.

Fig. 10 is a plan view of'an alternate closure part for the alternate main body part shown in Fig. 9.

Fig. 11 is an exploded view of the alternate carton formed from the blanks illustrated in Figs; 9 and 10 with-the closure part on the bottom, the'main body part above the'closure part, and'the window flaps of the-main bod'y'part raised to show detail-s of construction within the main body part.

Fig.'12 is: an isometric view of the alternate carton with the closure part facing upwardly, and one "lock-ing flap inserted within the opening in the closure part.

Fig. 131is' afragmentary vertical section throughthe locking flap of the alternate carton showing it inserted within the opening in the closure part, the view being taken in a plane indicated by line 1313 in Fig. 12.

In greater detail and'with particular reference to-Figs; 5- and 6, the preferred carton is composed of main body part land closure part 3. The main body-part 2 has a cover panel 4, with a first pairof'opposite' upright side walls 6 and asecond pair of opposite upright} side walls 7 respectively hingedly connected to cover panel of main body part 2 and reinforce the same.

4 along

score lines

8 and 9. Free outer edges 11 and 12 respectively of the first and second pairs of opposite

upright side walls

6 and 7 define an open mouth 13 in the main body part.

Locking flaps 14 for securing closure part 3 over open mouth 13 are hingedly attached to edges 11 of the first pair of opposite side walls 6 along double score lines 16. The double score lines 16 provide a better locking surface for abutment of the closure part 3, as 7 18 depend at substantially right angles to closure cover panel 17 in the set up carton, and they lie within open mouth 13 adjacent to the first pair of opposite upright side walls 6. Most advantageously closure part 3 is formed of a relatively rigid material, such as heavy cardboard or corrugated paperboard, compared to main body part 2 in order to impart rigidity and strength to the carton. Two pairs of opposite score lines 19 hingedly connect the end portions of side panels 18 to closure cover panel 17.

Portions of panels 18 are so cut from closure cover panel 17 as to provide projecting tabs 21 which in the set up carton extend outwardly of panel 1'7 within the open mouth 13. The tabs 21 are formed by U-shaped cuts 22 extending from score lines 19 into closure cover panel 17. In the set up carton the cuts 22 result in formation of openings 23 in panel 17 adjacent to projecting tabs 21. Most advantageously, cuts 22 extend into closure cover panel 17 a suificient distance to provide tabs 21 that extend to a point substantially even with free outer edges 11 of the first pair of opposite side walls '6.

Main body part 2 is secured to closure part 3 by locking flaps '14 extending over projecting tabs 21 and into opening 23 so that portions of closure part 3 overlie and underlie locking flaps 14. In the set up carton pro jecting tabs 21 abut against the portions of locking flaps 14 adjacent score lines 16 whereby the weight of the material within the carton resting upon closure part 3 is transmitted from the closure cover panel 17 through projecting tabs 21 to the portion of locking flaps 14 adjacent score lines 16. The greatest locking strength is obtained when each score line 16 is spaced from its adjacent score line 16 a distance substantially equal to the thickness of a projecting tab 21 to provide a secure seat for tab 21. By this arrangement only a part of the weight of the contents of the carton is transmitted to the outer end of locking flaps 14, which are urged outwardly against the interior edge 24 of each opening 23 formed by cuts 22. This construction provides a very strong lock for locking the closure part 3 to main body part 2 simply by snapping locking flaps 14 into openings 23, as best illustrated in Fig. 6. However, double score lines 16 are not essential and a single score line 16 effects satisfactory locking.

In order to limit the extent of inward movement of closure part 3 within open mouth 13, cooperative means on the main body part 2 and closure part 3 provide for abutment of such parts. Each of the second pair of opposite side walls 7 is provided with a flange 26 defined by score lines 27 extending transversely across walls 7. Score lines 27 provide a hinged connection about which the edge portion of each of side walls 7 may be turned inwardly to form flange 26. A pair of score lines 28 extending in a diverging direction from each end of each score line 27 to adjacent edges 12 of the second pair of Panels 7 1,944,727 p p 4 g a 4 upright walls 7 permit the flange 26 to be turned inward ly about score line 27, and hold the flange in place against pressure directed inwardly by closure part 3.

To provide a hinged connection between the

side walls

6 and 7, each of the second pair of opposite upright side walls 7 has an inturned tab portion 29 hingedly connected to each end of such side wall by score lines 31. The first pair of opposite upright side walls 6 and the second pair of opposite upright side walls 7 are joined at their ends by each of the tab portions 29 secured in overlapping relationship to an end portion 32 on an adjacent wall of the first pair of opposite side walls 6.

A main body part 2 that can be collapsed into the flat structure shown in Figs. 3 and 4 is obtained by defining each of end portions 32 with a score line 33 that is toldable inwardly within the open mouth 13 to collapse main body part 2. Score lines 33 run obliquely from an outer edge 11 of the first pair of opposite side walls 6 to a point adjacent the nearest end of score lines 8 by which the first pair of opposite side walls 6 are hingedly connected to cover panel 4. Inturned tab portions 29 are fastened only to the end portions 32 of the first pair of opposite upright side walls 6 in order to permit the side walls to be folded inwardly about score lines 33 by pressure preferably on the central portion of side walls 6 adjacent the free outer edges 11.

As the first pair of opposite upright side walls 6 move inwardly because of pressure on walls 6, the second pair of opposite upright walls 7 likewise are moved inwardly and towards cover panel 4 because of the pull of walls 6 through their end portions 32 attached to tab portions 29. The resultant inward pull on tab portions 29 causes the second pair of opposite side walls 7 to pivot about score lines 9 and become inwardly folded over cover panel 4, while each tab portion 29 becomes folded between the wall of the second pair of opposite side walls 7 to which it is attached and the cover panel 4,. as best shown in Figs. 3 and 4.

When the main body part 2 is collapsed, the entire area of each tab portion 29, including the part that extends beyond the end portion 32 to which it is attached, remains substantially parallel to the end portion 32, since tab portion 29 is not otherwise secured to a side wall 6. If desired, the sections of end portions 32 that extend beyond score lines 33 can be removed. However, the substantially rectangular flaps provide a double thickness to the area that they cover and add strength to the first pair of opposite side walls 6 without waste of material.

In the collapsed carton, flanges 26 are folded outwardly into the same plane as the second pair of upright walls 7 to which flanges 26 are respectively connected. Also, locking flaps 14 are unfolded into the same plane as the wall of the first pair of opposite side walls 6 to which they are attached, as shown in Fig. 3.

The carton construction enables the packed product to be attractively displayed by means of removable panels 34 in the main body part 2. The panels 34 are defined by tearable cut-score lines 36. Underlying the panels 34 are window sections 37 of transparent material which may be uncovered for display by removing panels 34, as illustrated in Fig. 7. The transparent windows 37 are formed in the usual manner by securing suitable material to the cover panel 4 and to the second pair of opposite upright side walls 7 on the underside of main body part 2. Con: ventional vent holes 38 in cover panel 4 provide ventilation for the packed product.

As previously mentioned, main body part 2 of the carton is formed from the single blank illustrated in Fig. 1. The blank is generally rectangular in shape except for protruding locking flaps 14. Rectangular cover panel 4 is defined by two pairs of parallel

opposite score lines

8 and 9. A first pair of opposite side walls 6 are hingedly secured to cover panel 4 along score lines 8, and a second pair of opposite side walls 7 are hingedly secured to cover panel 4 along score lines 9, sothatside Walls 6: and7.can

beerected.

Locking 'flaps'14'extend from each ofthe first pair of opposite side walls 6, andthe flaps 14 areattached to 'walls 6 along double score lines 16 as previously described.

The first and second pair of opposite side walls. 6 and 7 of the blank can be joined by means of" tab-portions hingedly connected to each end of a'side-wall7 along score lines 31". When walls 6 and-7 are-raised; upright tab portions 29' are adapted to) be adhesively secured to the interior of end portions 32 by adhesive39 asindicated by'stippling inFig. 1, or any othersuitable means, such as staples; 1 v

End portions 32 are defined by score lines" 33 which run obliquely from an outer edge 11 0f the first pair of opposite side walls- 6-to-a point-adjacent the nearest end part with the closure part to limitthe extentof inward movement: of 'the closure part within the open mouth.

Alsojthealt'ernate embodiment isadapted to have its closure part 53-setup in a simple die; packed with the product; and thenclosed by locking main body part 52 over closure-part 53;-whereas the. first embodiment is I constructed to have'the'main body part 2' filled with of score line'S-by which the first pair of'opposit'e'jside walls 7 are'hingedly connected to cover panel '4. 1 Flange-portions 26*on the secondpair of'side'wallsT are provided by scoreline's 27'-'on each'of-side walls 7, and a' pair of diverging score lines 28-. The score-lines 27 extend t'rans- 'versely; across side forming walls 7 substantially parallel the product; and closjed by closure part3. In addition the alternatjeiemb'o'diment utilizes one locking fiapj64 on each of ,itsfirstpair of opposite I side walls-"5'6; rather than thetwo locking" flaps'14 utilized on eachside wall 7 6 in the first embodiment,

" In the alternate embodiment the cooperative means 7 for limiting theextent of inward movement of'the' closure to and spaced a short distance from free'edge portions 1 12=of side forming walls'7; 7

The main body part 2 is formed from the blanket Fig.

6 and 7 respectively about score lines 8' and 9-to form upright-Walls defining'open mouth 13. Inturned'tab portions 29'are turned inwardlyabout score lines 31 within open mouth 13 and are adhesively secured to end portions 32 to'cornplete setting up of the main body portion 2.

Closure part 3' of the carton isformed from-the single blank illustrated in Fig. 2 Theclosure part has closure cover'panel17 of substantially the same size as open mouth-13 except that it is sufl'iciently long to restlon flanges 26. Panel 17-is defined on opposite sides by two pairs of opposite score lines 19'which hingedly connect the end portions of side panels 18 to closure cover panel 17, aud by cuts 22 extending a short distance in'topanel 17 between the score lines 19. As previously described, projecting tab forming portions 21 form a part of side panels 18 and are cut from material-derived fromclosure cover panel 17. V

For shipment to the packer, the main body part 2 and closure part 3 are shipped flat! Main body part 2 is shipped in the collapsed state withiinturned.tabportions 29 adhesively secured to endportions-32. In this manner the packer merely raises the first and second pairs of opposite upright walls 6and 7 and turns flanges 26- inwardly to-erect the main bodypart 2. The product is then easily packed in theupwardly turned open mouthv 13 of main body part 2.

Closure part 3v is also shippedto the packer flat as is shown in Fig. 2-. The reinforcing side panels 18 are turned downwardly from closure cover panel'17, and the closure part is inserted within open mouth 13 of the'set up main; body part 2 so that side panels 18 are adjacent thedir'st pair of opposite upright walls 6 and the closure cover panel 17 abuts against flange 26. The carton is then easily lockedby snapping locking flaps 14 over projecting tabs 21 andinto openings 23.: This snap-lock securelyholds closure part 3 tomain body part2 regardless of the weight of the packed product downwardly against closure part 3, since the weight is transmitted by tabs'2'1 to flaps- 14'adjac e nt score lines 16 alon'g'which locking flaps 14" arehingedly connected to-opposite side walls 6. Edges 24 of openings 23 in closurecover panel 17 hold the free ends of locking tabs 14 in place.

When the carton reaches the retailer he may lift removable panels 34 from-main body part 2 to disclose transparent window sections 37 through which'the prod uct is clearly displayed; The consumer readily opens part isprovided by utilizing reinforcing sidepanels 68 on closure part 53 which extend into open mouth 63 and abut against cover panel 54 of main body part 52. The width of the side panels 68 is suflicient to hold the attachedclosure cover panel 67 in open mouth 63 adjacent the free outer edges 61 and '62 respectively'of the first and second pair of

opposite side walls

56 and 57. Theflange-26 of the first embodiment is not utilized in the alternate embodiment of the 'invention.v

The alternate embodimenttofFigs. 9 through 13, as in the first embodimenu has a main body part 52' and a closure part 53; In the main body part 52,cove'r panel 54 has a first and second pair of opposite walls 56 and 57' respectively hingedly connected to the cover panel along score lines 58 and'5 9. Free'outer edges 61' and 62 of

side walls

56 and 57 define an open mouth 63' when main body part 52 is set up.

Opposed locking flaps 64 are hingedly attached to side walls 56 along double score lines 66. v A single locking flap 64 on each side wall 56is utilized in the alternate embodiment of the carton.

Closure part 53, preferably formed of relatively strong paperboard, has a closure cover panel 67' of substantially the same size as open mouth 63-, and two pairs of'opposite reinforcing

side panels

68 and 68a whichin the assembled carton depend within the open mouth 63 at substantially right angles to closure cover panel 67. A pair of suchside panels 68 are of sufficient size so that they abut against cover panel 54in the set up carton, as shown in Fig. 13, and space the closure cover panel 67 within open mouth 63 adjacent free edges 61 and '62.

Side panels

68 and 68a are attached to closure cover panel 67 along'four pairs of

opposite score lines

69 and 69a which respectively connect each end portion of a panel68 and 68a to closure cover panel 67;

the carton by pulhng locking flaps 14 out of openings 7 In a manner similar to tabs 21 in the first embodiment, projecting

tabs

71 and 71a are forrnedby U shaped cuts 72: and 72a extendingfrom the inner ends of score-lines 69' and 69a into closure cover, panel '67:" These cuts 72. and 72a define openings 73 and 73a in the set up carton. Locking flaps 64 lock closure: part 53' to main body part '52 as. in the first embodiment of'the inven 7 tion by extending over projecting tabs 71 into openings 73 so that portions of closure part 53 overlie 'and underlie lockingflaps64; {Thefreeends of locking flap s 64;are

held inwardly when the carton is locked by. the interior edge 7450f each opening73, as shown in,Fig. 13.-

Side panels 63a reinforce the set up carton and help 7 to hold the closure part 53 in place. It is to be noted thattscore lines 69a, along which side panels 68a are secured to cover panel 54-, are disposed inwardly of the ends of the. first pair of side panels 68 at point. 70 where eachscore line 69a intersects with-the adjoining score line- 69., .By this arrangement: side' panels. 68a

remain inwardly of the end edges of panels 68 when the

side panels

68 and 68a are raised at an angle of substantially ninety degrees to closure cover panel 67.

Since the panels 68:: do not project outwardly, it is relatively easy to insert the open mouth 63 of main body part 52 over the erected closure part 53. This is particularly desirable when closure part 53 is set up in a die which presses against the central portion of side panels 68a and tends to bow outwardly the ends of panels 68a that lie adjacent panels 68. In the present arrangernent the ends of panels 68a do not project beyond the ends of panels 68' even when the central portions of panels 68a are pressed inwardly. Therefore, the main body part 52 is easily slipped over erected closurepart 53 after the closure part has been packed in a suitable,

die. If desired, the openings 73a could be used to receive locking flaps attached to sidewalls 57 in order to lock all four sides of closure part 53 to main body part 52'.

To connect

walls

56 and 57 and provide a collapsible construction, each of side Walls 57 has a tab portion 79 turned inwardly in the set up carton and hingedly connected to each end of side walls 57 along score lines 81. Tab portions 79 are each adhesively jointed to an end portion 82 on an adjacent wall 56 by adhesive 89, indicated by stippling in Fig. 9; End portions 82 are collapsiblerinwardly along score lines 83, which run obliquely from the inner ends of cuts 85 to the nearest end of score line 558. Each cut 85 extends from an end of score line 83 to the outer free edge 61 of the side walls 6. When the main body part 2 is collapsed inwardly about score lines 83 the entire area of each tab portion 79 remains substantially parallel to the end portion 82, as described in connection with the first embodiment. Also, locking flaps 64 are unfolded and remain in the same plane as walls 56 when the main body part 52 is collapsed.

For attractively displaying the packed product, main body part 52 is provided with removable panels 84 which are defined by tearable cut score lines 86. Window sections 87 of transparent material underlie the panels 34- within the set up carton, andvent holes 88 provide ventilatio'n for the packed product.

As in the first embodiment of the invention, the blanks of the alternate construction are formed by die cutting paperboard and securing the window sections. The main body part 52 is assembled by adhesively securing tab portions 79 to end portions 82, and collapsing the main body part 52 fo'r shipment to the packer. Closure part 53 is shipped flat as it appears in Fig. 10. Most advantageously the closure part 53 is set up in a die, packed with the product, main body part 52 is erected, slipped over the walls 82 and 82a of closure part 3, and the carton locked by snapping locking flaps 64 into openings 73 The alternate embodiment of the carton is readily shipped, and utilized by the consumer in the same manner as the first embodiment described herein.

I claim:

1. A carton comprising a main body part having a cover panel, and a first and second pair of opposite upright side walls hingedly connected to said cover panel with edges of said first and second pair of upright side walls defining an open mouth; a closure part for said open mouth comprising a closure cover panel telescoped within said open mouth, and a pair of opposite side panels hingedly connected to said closure cover panel and extending Within said open mouth adjacent to said first pair of opposite upright side Walls, said closure cover panel having openings therein adjacent said side panels; and locking flaps attached by hinged connections to said edges of said first pair of opposite upright side walls, said locking flaps extending entirely through said openings in said closure cover panel with portions of said side panels urging outwardly with respect to said open mouth against said locking flaps adjacent said hinged connections, and portions of said closure cover panel th t face tially greater than the thickness of said flaps whereby the locking flaps form an acute angle between the outer faces of the locking flaps and the inner face of the cover panel inwardly of said cover panel to provide a lock in which pressure within the carton against the closure part is transmitted to the locking flap adjacent its hinged connection and the free end portion of the locking flap extending-through the opening in the closure part is in turn held in place by the closure part portion urging inwardly against the side of said'locking flap that faces outwardly of said open mouth, and cooperative means providing for abutment of said main body part with said closure part to limit the extent of inward movement of said closure part, said cooperative means on said main body part against which said closure part abuts being substantially parallel to said closure co'ver panel and being hingedly connected on at least three sides to said main body part. 7 j

2 A carton comprising a main body part having a cover panel, and a first and second pair of opposite upright side walls hingedly connected to.said cover panel with edges of said first and second pair of upright'side walls defining an open mouth; a closure part for said open mouth comprising a closure cover panel telescoped within said open mouth, and a pair of opposite side panels hingedly connected to said closure cover panel and extending within said open mouth adjacent to said first pair of opposite upright side walls, said closure cover panel having openings therein adjacent said side panels; and locking flaps attached by hinged connections to said edges of said first pair of opposite upright side walls, said locking flaps extending entirely through said openings in said closure cover panel with portions of said side panels urging outwardly with respect to said open mouth against said locking flaps adjacent said hinged connections, and portio'ns of said closure cover panel that face inwardly towards said open mouth and which lie adjacent said openings urging inwardly against the side of said locking flaps that face outwardly of said open mouth thereby securing said closure part within said open month, said locking flaps including portions projecting beyond the inner face of said cover panels, said openings through which the locking flaps extend having a width substantially greater than the thickness of said flaps whereby the locking flaps form an acute angle between the outer faces of the locking flaps and the inner face of the cover panel inwardly of said cover panel to provide a lock in which pressure within the carton against the closure part is transmitted to the locking flap adjacent its hinged connection and the free end portion of the locking flap extending through the opening in the closure part is in turn held in place by the closure part portion urging inwardly against the side of said locking flap that faces outwardly of said open mouth, and cooperative means providing for abutment of said main body part with said closure part comprising a ledge formed by inward folds at the edges of said second pair of opposite upright side walls and disposedinwardly of said closure cover panel within said open mouth against which said closure cover panel abuts to limit the extent of inward movement of said closure part. I

3. A carton comprising a main body part having a cover panel, and a first and second pair of opposite upright side walls hingedly connected to said cover panel with edges of said first and second pair of upright side walls defining an open mouth; a closure part for said open mouth comprising a closure cover panel telescoped :within said open mouth, and a pair of opposite side panels hingedly connected to said closure cover panel and extending within said open mouth adjacent to' said first pair of opposite upright side walls, saidclosure cover panel 1 having openings therein adjacent-said side panels; and I looking flaps attached by hinged connections to said edges of said first pair of;opposite'uprightsidewalls, said. locking flaps extending: lentirely through -saidi openingsin saidclosure cover panel with-.rportions of said side its hinged connection and the free end portion ofthe locking flap extending through theopening in the closure part is intur n'held in place by the closure part portion urging inwardly against theside of said locking flap that I facesjoutwardly of said open mouth, and-cooperative .i-means providing for abutment'of, said mainbody part c ,with said closure part to'limit, the extent of inward movepanels urging outwardly with respect to said open mouth I 7 against said locking flaps adjacent, said hinged, connections, and portions of said closure coverfpanelgthat"face inwardly towards said openmouth andwhich lie adjacent j said openings urging inwardly againstthe .side-jofsaidi,

locking flaps that face outwardly of said ,openjjmouth thereby securing said closure part within saidj openmouth,l said locking flapsincludingfportions projecting" beyond the inner face'of said cover panels, said openings through which the locking flaps'extend' havingia-jwidth v substantially greater than the thickness of said jfla'ps, whereby the locking flaps form an acute angle between i the outer faces of the locking flaps andthe innerface "of the cover panel inwardly of said cover panel to provide a lock in which pressure within the carton against the closure part is transmitted to the locking flap adjacent ment. of said closure "part; said cooperative means incl'uding side panels" hingedly connected to said' closure cover panel and depending within said open mouth to abut against. the cover panel offsaidmain body part."

References Cited in the file of this patent v UNITED' STATES PATENTS Y Sparks May 8, 1956