US2211488A

US2211488A - Method of forming egg cartons

Info

Publication number: US2211488A
Application number: US220068A
Authority: US
Inventors: Bergstein Samuel
Original assignee: Individual
Current assignee: Individual
Priority date: 1938-07-19
Filing date: 1938-07-19
Publication date: 1940-08-13
Anticipated expiration: 1957-08-13

Description

Aug. 13, 1940. s. BERGSTEIN- METHOD OF FORMING EGG CARTONS Filed July 19, 1958 2 Sheets-Sheet l ZTORNEYJ,

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METHOD OF FORMING EGG CARTONS Filed July 19, 1938 2 Sheets-Sheet 2 INVENTOR. SAM/4 flags-s r//v.

ATTORNEYIS.

Patented Aug. 13, 1940 I I 2 g r 9 UNITED STATES PATENT OFFICE METHOD OF FORMING EGG CARTONS Samuel Bcrgstein, Cincinnati, Ohio Application July 19, 1938, Serial No. 220,068

6 Claims. (Cl. 93-49) This application is a continuation in part of my Figure 10 Shows the final p f folding, in pending application, Serial No. 714,678 and covers which o t e Ca te s new ready for Shipment. the method described in said former application F r 11 ill rates the finished carton shown for making structures such as egg cartons. in Figure 10, in Squared up form- An object of my invention is to provide 9. Referring first to Figure 1, the form of blank method of folding and gluing bl nk having indicated has a panel No. 1 which for the sake plurality of projecting independent flaps. of convenience will be referred to as the top panel.

An object of my invention is the provision of AS indicated in the drawings, t s Pa is divided a method of forming a sealed, tubular carton havby transverse lines of weakening Without complete mg a tamper proof feature. severance, preferably by a line of perforations,

An object of my invention is the provision of a into an intermediate Portion la d marginal rnethod of making a carton structure severable Portions Articulated to Panel l e e 9 into a plurality of operative cartons. mlity 0f Projecting p intermediate fl p 3 Another object of my invention is to provide which is connected to the Portion la beinga method of folding and gluing h bl k ferred to for convenience as the tuck-in flap,

wherein intermediate flaps are folded to underlie while the m r l flaps adj in n 3. n rti uan opposite outer panel,but are unsecured thereto. lated to the portions 2 d marked 4 wi A still further object of my invention is to probe referred to for the sake of convenience as the vide a method of folding and gluing such blanks lue fial S- It W be convenient to refer o 6 as in flat knocked-down form, while the blanks are the back P and as the bOttOm Panel, and

being moved along. to 5 as the front panel.

These and other objects of my invention will Referring a moment to the completed. be apparent from the following descriptions taken erected carton as illustrated in Figure wherein in connection with the accompanying drawings, I w employ k numerals t those set forth wherein one preferred method of practicing the above as to the blank, the reasons for the deeiginvention is specifically set forth, the novelty innations given n e pa a ph ab l be herent in the invention being set forth in the readi y ap Referring o F u e 5. t e lue claims appended to this specification, to which flaps 4, been secured to the front Panel reference ishereby made. The tuck-in flap 3 is in position behind front In the drawings: panel 5, but it is unsecured to the front panel. 3

Figure 1 is a perspective view illustrating part In this erect position the carton can be packed of the steps in forming the carton from the flat with contents y insertion t h e the end, blank. as for example, by sliding in a filler which has Figure 2 is a perspective view showing a step been loaded with eggs. And when it is desired in the folding of the blank illustrated in Figure 1. to remove the contents, the c r n can be Opened Figure 2a illustrates a step subsequent to Figure m t p y lifting upward 011 the e 2, adhesive having been applied to the under surdiate pa l portion la, severing the panel along face of the glue flaps. the lines of weakening therein. The tuck-in flap Figure 3 illustrates a perspective of this blank 3 being unsecured to the adjoining marginal flaps in a subsequent stage of folding. I, 4 will readily start to lift, and when the entire Figure 4 is a perspective illustrating the blank t diat lid p t as e raised n p n after the final folding operation, in which form position, the carton will still retain its tubular the carton is ready for shipment. form due to the marginal portions 2, 2.

Figure 5 is a perspective of the finished carton In order to accomplish this, my preferred prostructure shown in Figure 4 upon being square up. cedure is to have the blanks move along mm the Figure 6 is a view of another form of blank flaps projecting transverse the direction of moconsisting of multiple units, illustrating part or tion without any reference to timed relation. the steps in forming the carton from the blank. e first S ep in e folding 15 to divert the c Figure Us a perspective of the blank shown in in p from t Plane 01 the fl t ank, prefer-.- Figure 6 in its initialstage of folding. ably upward as i u a in u e There- Figure 8 shows the step Subsequent to Figure 7, after in the course of further movement, the glue adhesive having been applied underneath the glue flaps can be coated on the under side by a conflaps. tinuously revolving glue wheel, as shown in Fig- Figure 9 is a perspective of this blank with ure 2a. Thereafter, the partially folded position subsequent folding operations. of the tuck-in flap may be relaxed, and the usual type folding device, such as twist belts or the like, employed to fold over the top panel (as shown in Figure 3), the final stage thereafter being to fold the front panel over as shown in Figure 4. Since the top wall has merely been weakened but not completely severed, the top wall and flaps fold as a unit, with no dislocation of parts either in feeding or folding. The folded carton thereafter is conveyed to pressure devices, such as a series of rollers or a stacking conveyor where the cartons are lapped under pressure in offset relation to cause adhesion.

In Figure 1, I have illustrated one way of accomplishing the foregoing steps automatically. Here the'carton blanks are fed along by suitable conveying elements indicated at El in the direction indicated by the arrow. Suitably mounted on the frame of the machine is a twist plate ill having a narrow extension H which is spaced so as not to engage the glue flaps 4, l as the blank moves forward, but which projection does engage the longer tuck-in flap 3, as illustrated. In conjunction with this twist plate is an overhead spring finger l3, suitably positioned as indicated, which depresses the glue flaps l, 41 as the blank moves under it, which, as shown, does not depress the tuck-in flap 3, because the outer edge of the tuck-in flap 3 is supported by the extension ll of the twist plate, as previously explained.

As a result the tuck-in flap rides on the twist plate, while the glue flaps travel underneath it, and the plate is twisted as indicated at l2 to bring the tuck-in flap into upright position out of the plane of the glue flaps, so that as the blank further progresses in the same direction of motion the extended glue flaps can receive a coating of adhesive on their under surface from the continuous glue wheel I 3a, which lies in the path of the glue flaps. Thereafter, the twist plate can release the tuck-in flap, and the carton structure is ready for folding as illustrated in Figures 3 and 4 to bring it into its final form.

In Figures 6 to 11, I have shown an alternate form of blank which is adaptable to my method, the finished carton in squared-up form being shown in Figure 11. While manufactured as a single unit, the carton in use can be broken along the line of fracture 20 into two distinct and independent units.

Referring to the blank shown in Figure 6, it can be seen that there are two tuck-in flaps and three glue flaps, the middle glue flap being adapted to be subsequently severed into two parts if the carton is broken into two units by the user along the line of weakening 20, as explained in the preceding paragraph. As in the previous example, the glue flaps are of shorter length than the tuck-in flap.

As illustrated, the blanks consist of a top panel designated by H across which there are transverse lines of weakening without severance dividing this top panel into two lid portions Ha, Ma and adjoining marginal portions 15. The projecting independent flaps comprise two independent tuck-in flaps 2|, 2| articulated to Ila, a, and three

glue flaps

22, 22, 22 and there is also the back panel H, the bottom panel I9, and the front panel l8. As illustrated the line of fracture 20 transverses the entire blank, and it can be seen that this line 20 divides the blank into two component units, each unit of which is constructed in exactly the same manner as the blank previously described in Figures 1 to 5.

And in forming the carton, the steps are the same as previously described in connection with the other blank previously referred to. As illustrated in Figure 6, the spring finger it again serves to deflect the glue flaps under the twist plate, the twist plate engaging the tuck-in flaps and in the course of further motion of the blank turning the tuck-in flaps in upright position as shown in Figure 7. Again this leaves the glue flaps projecting in the original plane of the blank, so that in the course of further motion of the blank the continuously revolving underneath glue wheel can apply adhesive to the under surface of these flaps as shown in Figure 8, whereupon the tuck-in flaps may be released and the carton folded as shown in Figure 9, and lastly as shown in Figure 10 thereafter conveyed under pressure to secure adhesion.

It can be seen that by my method I accomplish the gluing and folding of blanks having a plurality of projecting flaps that certain selective flaps including the forward and rearward flaps in the direction (if motion of'the blank are adhered, while other flaps are left unsecured, but in folded condition underlying the front panel, and that I accomplish this by a rapid operation as the blanks are moved along, resulting in a carton in knocked-down form having the characteristics described.

The embodiment shown in my preferred method as it permits application of adhesive to interi mittent flaps without the need of timed spacing of the blanks. It will be apparent that my procedure for forming cartons of this type can be carried out also on machines adapted to convey a sucession of blanks in timed relation, in which 5 case a timed adhesive mechanism can be used to apply glue either to the upper surface of the front panel on the portions corresponding to the glue flaps, or to the glue flaps themselves without the need of flap separation. It is also apparent that 4 variations can be made in the blank adaptable to my method, such as having the glue flaps articulatedto the front panel instead of to the lid panel, asjt is immaterial which of the two outer panels the glue flaps are articulated thereto, but 4 I prefer the particular blank structures illustrated due to the fact that they are more economical. All such modifications should be understood to be included in the scope of my invention, and

what I claim as new and novel, and desire to se- 5 cure by Letters .Patent is as follows:

1. A method of forming a closed tubular carton having when erected a separate tuck in flap in position within the carton and attached only to a central panel divided from the top of the carton 5;

by partially severed lines, which consists in forming a blank having a main bottom panel, side panels, top panel and a flap articulated to the top panel, forming incomplete lines of severance through the top panel portion to define sides 6 of a median portion forming complete lines of severance between the median portion of the flap and its ends, so as to leave glue tabs separated from the rest of the flap at both ends, folding the entire top panel with the articulated flap por- 5 tions over upon the remainder of the blank, and then folding'the still uncovered side wall portion over upon the articulated flap portions, adhesive having been applied to those areas wherein said side wall engages the separated glue tabs whereby 70 the median portion of the said flap will when the carton is erected, be detached from the glued portions, and in position to be lifted up by completing the partial lines of severance of the median portion of the top panel, the adhesive be- 7 ing applied by the step of separating the median portion of the flap from the terminal tabs, applying adhesive to the faces of said tabs, and then releasing the median portion before folding over the top panel.

2. A process of making a glued, collapsible tubular carton having an initially sealed top panel portion and adapted to be opened without de-.

stroying the carton, which comprises scoring a blank along longitudinal fold lines to form bottom, side and top walls and a sealing flap, perforating said blank along transverse lines to define panel portions extending transversely of the top wall, completely severing said sealing flap along lines in continuation of said perforation lines, applying glue to the blank in a manner to secure certain of said severed portions of said sealing flap along one longitudinal edge of the blank to the other longitudinal edge of the blank, and folding said blank into tubular form along some only of said longitudinal fold lines.

3. A process of making a glued, knockdown tubular carton having initially sealed top panel portions and adapted to be opened without destroying the carton, which comprises scoring a blank along longitudinal fold lines to form side, bottom and top walls and a sealing flap, perforating said blank along transverse lines to provide panel portions extending transversely of the top wall, said panel portions being at least five in number, completely severing said sealing flap along lines in continuation of said perforation lines, applying glue to the blank in a manner to secure alternate ones of said severed portions of said sealing flap including the end portions there-' of along one longitudinal edge portion of the blank to the other edge portion of the blank, and folding said .blank into tubular form along some only of said longitudinal fold lines.

4. A process as set forth in claim 3 including the step of perforating the blank transversely through all walls with a line of perforations centrally disposed of the blank, whereby the carton is separable into two complete operative units.

5. A process of making a glued, collapsible, tubular carton having an initially sealed top panel portion and adapted to be opened without destroying the carton, which comprises cutting,

.scoring and perforating a blank so as to provide bottom, side and top walls articulated together,- incompletely severed panel portions extending transversely of said top wall to provide a closure panel, and laterally contiguous tube-maintaining panels, a tuckflap articulated to said closure panel and sealing flaps for said tube-maintaining panels, said flaps being free of each other, applying glue to the blank in such a way, as to adhere said sealing flaps to a wall at the respective edges of the blank, and folding said blank into tubular form along certain only of said lines of articulation.

6. A process of making a glued, knockdown tubular carton which includes cutting, scoring and perforating a blank to provide a bottom, side walls on each side of the bottom, a top articulated to one of the side walls, the perforating step providing lines of weakening in the top wall to divide it into at least one portion which may be used as a lid panel, and tube-maintaining portions at each side thereof, said lid panel having a tuck flap articulated thereto, there being sealing flaps for said tube-maintaining portions, said perforations being formed without completely severing said top wall whereby said top wall may be folded as a unit, applying glue to said blank in such a way as to cause adhesion of said sealing flaps to an opposite edge of said blank, and folding the blank into tubular form along some only of said lines of articulation, the flat, tubular blank thus formed being erectible without freeing said lid panel, said carton thus being one in which lifting the lid panel breaks the saidlines of perforation and provides an indication that the carton has been opened.

SAMUEL BERGSTEIN.