US2669167A - Machine for erecting double side walls on double walled cartons - Google Patents

Description

Feb. 16, D HL MACHINE FOR ERECTING DOUBLE SIDE WALLS ON DOUBLE WALLED CARTONS Filed Dec. 3, 1952 3 Sheets-Sheer. l

w y a f M 47' 5 IN VEN TOR Feb. 16, 1954 v J. D. BEHL 2,669,167

MACHINE FOR ERECTING DOUBLE SIDE WALLS ON DOUBLE WALLED CARTONS Filed Dec. 3, 1952 3 Sheets-Sheet 2 Ti -.Z.Z. Y 7- 7 f @mgw Feb. 16, 1954 J BEH'L 2,669,167

MACHINE FOR ERECTING DOUBLE SIDE WALLS ON DOUBLE WALLED CARTONS Filed Dec. 3, 1952 3 Sheets-Sheet. I5

INVENTOR.

CM 2 56m i,@wa {We -5 in Fi 1.

-I-l-'--II in Fig. 1.

Patented Feb. 16, 1954 MACHINE FOR ERECTING DOUBLE SIDE WALLS ON DOUBLE WALLED CARTONS John D. Behl, Kalamazoo, Mich., assignor to Sutherland Paper Company, Kalamazoo, Mich., a corporation of Michigan Application December 3, 1952, Serial No. 323,816

16 Claims.

This invention relates to improvements in machine for erecting double side walls on double walled cartons.

The principal objects of this invention are:

First, to provide a machine which will automatically form extended side flaps on a carton blank into double side walls and lockingly engage the side walls with previously erected double end walls.

Second, to provide a machine that will fold the side wall forming flaps of a carton blank in the desired fashion without unnecessarily rubbing and marring the Wall forming flaps.

Third, to provide a machine which will fold a flap in three spaced parallel fold lines and progressively fold the flap into a double walled structure.

Other objects and advantages of the invention will be apparent from a consideration of the following description and claims. The drawings of which there are three sheets illustrate a highly practical form of the invention.

Fig. 1 is a plan view of the machine as attached to an auxiliary structure for delivering the partially erected cartons thereto.

Fig. 2 is a perspective view of one of the partially erected cartons as it is delivered to the side wall folding machine.

Fig. 3 is a perspective View of the finished double walled carton as delivered by the machine.

Fig. 4 is a fragmentary transverse cross sectional view through the machine taken along the plane of the line 4-4 in Fig. 1.

Fig. 5 is a fragmentary transverse cross tional view taken along the plane of the secline secline secline seeline .8- -8 in Fi 1.

secline Fig. 9 is a fragmentary transverse cross tional view taken along the plane of the 99 in Fig. 1.

Fig. 10 is a fragmentary transverse cross tional view taken along the plane of, the Ill-10 in Fig. 1.

Fig. 11 is a fragmentary transverse cross tional view taken along the plane of the secline secline Fig. 12 is a fragmentary longitudinal cross sectional view taken along the plane of the line lZ-IZ in Fig. 1.

Fig. 13 is a fragmentary perspective view illustrating the side wall forming flap in the initial bending stages thereof.

Fig. 14 is a fragmentary perspective view of the carton with the side wall forming flap in a further folded position.

Fig. 15 is a fragmentary perspective View of the carton near the end of the erecting operation.

Fig. 16 is a fragmentary perspective view of the carton in its finally erected position.

The carton on which the machine is designed to operate is made of paper board or cardboard and includes a flat rectangular bottom panel I having outer end walls 2 folded upwardly from the ends thereof. The top edges of the end walls are turned inwardly in top end spacer walls 3 and the inner edges of the top end spacer walls are connected to downwardly extending inner end walls4 that are thus positioned in parallel spaced relationship with the outer end walls 2. The lower edges of the inner end walls 4 are connected to integral attaching flaps 5 that are glued to the bottom panel I. The end walls 2 and 4 are erected into the rectangular cross sectional shape illustrated by a preliminary forming and erecting structure a portion of which is indicated at 6 in Fig. 1. The relative description of the sides and ends of the carton is for purpose of description only and it will be appreciated that either side of the carton might be considered the side or end. The cartons are delivered to the side wall erecting apparatus from the end wall erecting mechanism by a conveyor generally indicated at I with the end walls 2 and 4 at the leading and trailing ends of the partially erected carton with respect to the path of movement of the carton.

The ends of the inner side walls 4 are cut away or notched as at 8 to provide a flap receiving recess in the chambered end wall of the carton and the notch 8 is enlarged at the bottom to provide a downwardly facing locking shoulder 9.

The side wall forming flaps of the carton blank are folded integrally upwardly from the side edges of the bottom panel I as at H]. The side wall forming flaps are prescored as at I l to form a fold line between the outer side wall panel [2 and a top spacer panel [3. A second score line i l defines a folded connection between the top spacer panel l3 and the inner side wall panel 15. A third score line l6 forms a folded connection between the inner side wall panel l and a bottom spacer flap ll. The ends of the inner side wall panel are cut away from the of the top spacer panel l2 by a distance approximately equal to the width 01 the top spacer panel 3 in the double end walls. The end of the inner side wall panel is notched as. at it to provide an upwardly facing shoulder that coacts with the locking shoulder a on the inner end wall when all of the walls are erected. The triangular portion It on the ends of the inner side walls forms a locking tab that is projected. through the notched end 8 of the inner end wall and desirably the line of connection between the tab is and the inner side wall panel isscored as at 26 to facilitate entry of the locking tabs between the inner end walls of thecarton.

The outer side wall panels ii are provided with flap receiving slots 2| and the outer" end wall panels 2 are provided with end flaps 22 that are folded into locking engagement in the slots by the preforming mechanism 5.. The cartons thus come from the preforming mechanism G in the form illustrated in Fig. 2..

The conveyor 5 which advances: the partially formed cartons through the final erecting operation includes a conveyor chain 23 driven in timed relationship with. the preforming mechanism by the shaft 24 and chain 25. The conveyor chain 23 is provided with carton advancing flights 26 that advance the cartons progressively along the conveyor way El. Side rails 28 laterally support the side walls of the carton with the upper portions of the side wall forming flap projecting above the level of the side rails. Extending transversely across and over the conveyor way and the containers thereon is a bridge element 2% located near the infeed end of the conveyor. A second bridge element- 38 extends transversely across the conveyor way near the off-deed end of the conveyor. A central hold down rail 5! is supported by the bridge elements longitudinally over the center of the conveyor way and above the cartons to slidingly engage the erected end walls of the cartons as they are advanced along the way.

The first folding operation performed by the machine is the folding of the bottom spacer flap ill from the plane of the side flap forming panel. This operation is performed as is best illustrated in Fig. l by pairs of rollers 32 and 33 supported from the bridge element 29 and rotatable about transversely spaced vertical axes. The rollers 32 are disposed to engage the inner sides of the side wall forming flaps just below the score line it while the rollers 33 are disposed to engage the outer side of the side wall forming flap above the score line. As the carton is advanced between the pairs of rollers 32 and 33 the score line It is broken or bent to deflect the bottom spacer panel I! inwardly of the carton and of the conveyor way. During the breaking of the score line it the side wall forming flaps are held upwardly by a support 34 that is carried underneath the bridge element 29 and the center rail 3!. The side edges of the support 34 are disposed in inwardly spaced relationship with respect to the side rails 28 and hold the side wall forming flaps in upright position.

fter the bottom spacer flaps have been bent from the plane of the inner side wall panels i5 the container is advanced. to side flap folding rolls best illustrated in Fig. 5 and indicated at The rollers 35- are supported on vertical axes spaced outwardly from. the general plane-oi the side rails 28 and the rollers are downwardly tapered as illustrated to engage the outer sides of the inner side wall flaps i5 and bend the inner side walls inwardly of the carton. The side edges of the support 34 continue to laterally support the inner surface of the side wall forming flap'just below the score linev is between the inner side wall panel and the upper side wall spacer panel 52. After passing the rollers i the inner side wall panels are advanced past side flap folding. rollers 36 that are rotatable about upwardly and inwardly inclined axes so that the periphery of the rollers engages the partially deflected inner; side. wall panels and bends them further inwardly. The rollers 35 are inwardly tapered to facilitate entry of the leading edges of the. inner side. wall panels to below the periphery of the rollers 36. After passing the side flap folding rollers 35 the cartons are advanced past bending rollers 37 that are rotatable about transverse horizontal axes. and are disposed with their peripheries located over and inwardly of extensions 38 of the support 34. The rollers 31 thus coact with the. support extensions 38 t0 crimp the fold along the score line I4.

After passing the bending rollers 31 the cartons are advanced to a longitudinally spaced series of rollers 39A, 39B, 33C, and son. The rollers: 39 are rotatable about transverse horizontal axes and have their lower peripheries positioned at approximately the level of the tops of the end walls of the carton. The; rollers of the series are spaced with. their outer edges progressively further outwardly from the center of the conveyor way so that each roller depresses the inner side wall panel it further into: the carton. Note that the lower spacer panel ll approaches the bottom panel 5 of the carton during this operation. After passing the series of rollers 3.9 the carton is advanced past bevelled crimping: rolls 40 that are rotatable about downwardly and inwardly'inclined axes with the rollers disposed on the inner sides of the cartons and just above the level of the end walls. These rollers engage and crimp the inner side wall forming panels l5 against the upper spacer panels i2 and thus crimp or set the folds along the score line I4.

After the cartons pass the bevelled crimping rolls 4!] they are advanced past inwardly tapering rollers 41 illustrated in Fig. 10'. The rollers 4| are rotatable about horizontal axes and are disposed with their lower periphery in the path of the upper spacer panels 52 to fold these panels inwardly and bend the side wall forming flap along the score line I l A second set of inwardly tapered rolls 42 positioned behind the rolls 4'! and illustrated in Fig. 11 have a smaller degree of taper and further bend the top spacer panels [2 inwardly. During the downwardly folding motion of the top spacer panels I! the inner side wall panels I5 are pressed downwardly between the inner end walls 4 of the carton and the looking tabs I9 are sprung into the notches 8 in the ends of the inner end walls. The bottom side spacer panels ll are carried against the bottom side edges of the carton where they form abut' ments or supports to facilitate bending of the side wall forming flaps along the score lines H, M and I6.

After the cartons have passed the rollers 4| and 42 they ar advanced underneath rotating shoes 43 that are carried on arms 44 secured to the transversely extending shaft G5. The shaft 45 extends transversely across; the conveyor way and, is driven in timed relationship Withthe conveyor chain 23 by a chain 46 to rotate the arms 44 against the direction of movement of cartons and in timed. relation with the conveyor chain to present the shoes 43 to the now nearly horizontal top spacer panels l2. The lower surfaces of the shoes 43 at the lower limit of their travel are disposed in the plane ofthe upper surface of the end walls of the carton and thus firmly press the side walls into fully erected rectangular cross sectional position. This final downward pressure on the upper side spacer panels I: forces the inner side walls l5 downwardly sufliciently to permit the upper edges of the locking tabs 19 to snap underneath the locking shoulders 9 in the inner end walls and the erection of the carton is complete.

In order to make sure that the erected carton is square and firm it is advanced past squaring rollers 41 after passing the shoes 43. The rollers 41 are outwardly tapered and disposed over the double side walls of the carton to cammingly force th inner and outer side wall slightly outwardly against the side rails 28 to assure that the sides of the carton are square. After passing the rollem 41 the cartons are delivered from the end of the erecting machine.

A highly practical form of the invention has thus been described so that others may reproduce or use the same for the purpose intended. Quite obviously various modifications and changes in detail and arrangement of the parts can be made without departing from the spirit of the invention as defined in the following claims.

It will be understood that the terms side walls and end walls are used in the specification and claims as a matter of convenience in desi nating the parts particularly in relation to the elements coacting therewith in erecting the carton, and that the carton might be of any desired dimensions, that is, it might be elongated rather than square as is illustrated.

Having thus described our invention, what we claim to be new and desire to secure by Letters Patent, is:

l. A. machine for folding and erecting inner side walls on a partially erected carton having erected double end walls and outer side Walls with inner side wall forming flaps extending as continuations above said outer side walls comprising, a conveyor having flights adapted to advance the cartons in endwise fashion, side rails laterally retaining said outer side walls along said conveyor, bridge elements spaced longitudinally along said conveyor and extending transversely thereover, a hold down rail supported by said bridge elements and extending beyond the element at the infeed end of the conveyor to engage the tops of the end walls of said cartons, a support carried by said center rail at the infeed end thereof in spaced relation above said end Walls and coacting with said side rails to laterally support the inner sides of said side wall flaps in upright position, pairs of rollers mounted on the infeed end bridge element for rotation about transversely spaced vertical axes on opposite sides of said side flaps, the rollers of said pairs being vertically spaced to bend the upper ends of said sid 'fiaps inwardly into spacer flaps, the flaps being scored to facilitate such bending, side flap folding rollers mounted on inclined axes on. said side rails behind said pairs of rollers and engageable with said side flaps to fold the same inwardly over the sides of said support, said side folding rollers being tapered inwardly, narrow extensions on the trailing end of said support, bending rollers rotatable about transverse horizontal axes over said extensions to bend said side flaps thereover, a series of longitudinally spaced rollers positioned behind said bending rollers and rotatable about transverse horizontal axes with the outer ends of the rollers in the series positioned progressively outwardly from the center of th conveyor to progressively depress said side flaps, bevelled crimping rollers positioned behind said series of rollers to crimp said side flaps against said outer side walls, inwardly tapering rollers rotatable about transverse horizontal axes behind said crimping rollers and in the path of the crimped fold in said side flaps to fold the subadjacent portions of the side flaps inwardly into top spacer walls, and shoes rotatable in longitudinal vertical planes over said side walls and swingable in timed relationship with said conveyor in oppositely traveling direction to the level of the tops of said outer walls to bend said top spacer walls to horizontal position, the inner side wall forming flaps being pressed against the bottom of the carton in spaced relation to the outer side Walls by the top spacer walls.

2. A machine for folding and erecting inner side walls on a partially erected carton having erected double end walls and outer side walls with inner side wall forming flaps extending as continuations above said outer side walls comprising, a conveyor having flights adapted to advance the cartons in endwise fashion, side rails laterally retaining said outer side walls along said conveyor, bridge elements spaced longitudinally along said conveyor and extending transversely thereover, a hold down rail supported by said bridge elements to engage the tops of the end walls of said cartons, a support carried by said center rail at the infeed end thereof in spaced relation above said end walls and coacting with said side rails to laterally support the inner sides of said side wall flaps in upright position, pairs of rollers mounted on the infeed end bridge element for rotation about transversely spaced vertical axes on opposite sides of said side flaps, the rollers of said pairs being vertically spaced to bend the upper ends of said side flaps inwardly into spacer flaps, side flap folding rollers mounted on inclined axes behind said pairs of rollers and engageable with said side flaps to fold the same inwardly over the sides of said support, narrow extensions on the trailing end of said support, bending rollers rotatable about transverse horizontal axes over said extensions to bend said side flaps thereover. a series of longitudinally spaced rollers positioned behind said bending rollers and rotatable about transverse horizontal axes with the outer ends 01' the rollers in the series positioned progressively outwardly from the center of the convevor to progressively depress said side flaps. bevelled crimping rollers positioned behind said series of rollers to crimp said side flaps against said outer side walls, inwardly tapering rollers rotatable about transverse horizontal axes behind said crimping rollers and in the path of the orimped fold in said side flaps to fold the sub-adjacent portions of theside flaps inwardly into top spacer walls, and shoes rotatable in longitudinal vertical planes over said side walls and swingable in timed relationship with said conveyor to the level of the tops of said outer walls to bend said top spacer walls to horizontal position, the inner side wall forming flaps being pressed against the bottom of the carton in spaced relation to th outer side walls by the top spacer walls.

3. A machine for folding and erecting inner side walls on a partially erected carton having erected end walls and outer side walls with inner side wall forming flaps extending as continuations above said outer side walls comprising, a conveyor having flights adapted to advance the cartons in endwise fashion, side rails laterally retaining said outer side Walls along said conveyor, 2. hold down rail supported longitudinally over said conveyor to engage the tops of the end walls of said cartons, a support carried by said center rail at the infeed end thereof in spaced relation above said end Walls and coacting with said side rails to laterally support said side wall flaps, pairs of rollers mounted above the infeed end of said support for rotation about transversely spaced axes on opposite sides of said side flaps, the rollers of said pairs being axially spaced and overlapping to bend the upper ends of said side flaps inwardly into spacer flaps, side flap folding rollers mounted alongside said conveyor behind said pairs of rollers and engageable with said side flaps to fold the same inwardly over the sides of said support, narrow extensions on the trailing end of said support, bending rollers rotatable about transverse axes over said extensions to bend said side flaps thereover, a series of longitudinally spaced rollers positioned behind said bending rollers and rotatable about transverse axes with the outer ends of the rollers in the series positioned progressively outwardly from the center of the conveyor to progressively depress said side flaps, bevelled crimping rollers positioned behind said series of rollers to crimp said side flaps against said outer side walls, inwardly tapering rollers rotatable about transverse axes behind said crimping rollers and in the path of the crimped fold in said side flaps to fold the subadjacent portions of the side flaps inwardly into top spacer walls, and shoes rotatable in longitudinal planes over said side walls and swingable in timed relationship with said conveyor to the level of the tops of said outer walls to bend said top spacer walls to horizontal position.

4. A machine for folding and erecting inner side walls on a partially erected carton having erected end walls and outer side walls with inner side Wall forming flaps extending as continuations above said outer side walls comprising, a conveyor having flights adapted to advance the cartons in endwise fashion, side rails laterally retaining said outer side walls along said conveyor, a hold down rail supported longitudinally over said conveyor to engage the tops of the end walls of said cartons, a support carried by said center rail at the infeed end thereof in spaced relation above said end walls and coasting with said side rails to laterally support said side wall flaps, pairs of rollers mounted above the infeed end of said support for rotation about transversely spaced axes on opposite sides of said side flaps, the rollers of said pairs being axially spaced and overlapping to bend the upper ends of said side flaps inwardly into spacer flaps, side flap folding rollers mounted alongside said conveyor behind said pairs of rollers and engageable with. said side flaps to fold the same inwardly over the sides of said support, narrow extensions on the trailing end of said support, bending rollers rotatable about transverse axes over said extensions to bend said side flaps thereover, a series of longitudinally spaced rollers positioned behind said bending rollers and rotatable about transverse axes with the outer ends of the rollers in the series positioned progressively outwardly from the center of the conveyor to progressively depress said side flaps, rollers rotatable behind said series of rollers and in the path of the upstanding portions of said side flaps to fold the upstanding portions of the side flaps inwardly into top spacer walls, and shoes rotatable in longitudinal planes over said side walls and swingable in timed relationship with said conveyor to the level of the tops of said outer walls to bend said top spacer walls to horizontal position.

5. A machine for folding and erecting inner side walls on a partially erected carton having erected end walls and outer side walls with inner side wall forming flaps extending as continuations above said outer side walls comprising, a conveyor having flights adapted to advance the cartons in endwise fashion, means laterally retaining said outer side walls along said conveyor, a support mounted over said conveyor at the. infeed end thereof in spaced relation above said end walls and acting to laterally support the inner sides of said side wall flaps, pairs of rollers mounted above said support for rotation about transversely spaced axes on opposite sides of said side flaps, the rollers of said pairs being axially spaced and overlapped to bend the upper ends of said side flaps inwardly into spacer flaps, side flap folding means mounted behind said pairs of rollers and engageable with said side flaps to fold the same inwardly over the sides of said support, narrow extensions on the trailing end of said support, means positioned over said extensions and engageable with the outsides of the side flaps to bend said side flaps over said extensions, a series of longitudinally spaced rollers positioned behind said last means with the outer edges of the rollers in the series positioned progressively outwardly from the center of the conveyor to progressively depress said side flaps and press the swinging end thereof between said end walls, crimping rollers positioned behind said series of rollers to crimp the inwardly folded portions of said side flaps against the unfolded portions thereof, rollers positioned behind said crimping rollers and in the path of th fold in said side flaps to fold the sub-adjacent portions of the side flaps inwardly into top spacer walls, and shoes rotatable over said side walls and swingable in timed relationship with said conveyor to the level of the tops of said outer walls to bend said top spacer walls to horizontal position.

6. A machine for folding and erecting inner side walls on a partially erected carton having erected end walls and outer side walls with inner side wall forming flaps extending as continuations above said outer side walls comprising, a

conveyor having flights adapted to advance the cartons in endwise fashion, means laterally retaining said outer side walls along said conveyor, a support mounted over said conveyor at the infeed end thereof in spaced relation above said end walls and acting to laterally support the inner sides of said side wall flaps, pairs of rollers mounted above said support for rotation about transversely spaced axes on opposite sides of said side flaps, the rollers of said pairs being axially spaced and overlapped to bend the upper ends of said side flaps inwardly into spacer flaps, side flap folding means mounted behind said pairs of rollers and engageable with said side flaps to fold the same inwardly over the sides of said support, a. series of longitudinally spaced rollers positioned behind said last means with the outer edges of the rollers in the series positioned progressively progressively depress said side flaps and press-the swinging end thereof between said end walls, rollers positioned behind said series of rollers and in the path of the fold in said side flaps to fold the sub-adjacent portions of the side flaps inwardly into top spacer walls, and shoes rotatable over said side walls and swingable in timed relationship with said conveyor to the level of the tops of said outer walls to bend said top spacer walls to horizontal position.

'7. A machine for folding and erecting inner side walls ona partially erected carton having erected end walls and outer side walls with inner side wall forming flaps extending as continuations above said outer side walls, comprising a conveyor having flights adapted to advance the cartons in endwise fashion, means laterally retaining said outer side walls along said conveyor, pairs of rollers mounted above the infeed end of said conveyor for rotation about transversely spaced axes on opposite sides of said side flaps, the rollers of said pairs being axially spaced and overlapped to bend the upper ends of said side flaps inwardly into spacer flaps, side flap folding means mounted behind said pairs of rollers and engageable with said side flaps to fold the same inwardly, a series of longitudinally spaced rollers positioned behind said side flap folding means with the other edges of the rollers in the series positioned progressively outwardly from the center of the conveyor to progressively depress said side flaps, crimping rollers positioned behind said series of rollers to crimp the inwardly folded portions of said side flaps against the unfolded portions thereof, means positioned behind said crimping rollers and in the path of the crimped fold in said side flaps to fold the sub-adjacent portions of the side flaps inwardly into top spacer walls, and shoes rotatable over said side walls and swingable in timed relationship with said conveyor in oppositely traveling direction to the level of the tops of said outer walls to bend said top spacer walls to horizontal position, the inner side wall forming flaps being pressed against the bottom of the carton in spaced relation to the outer side walls by the top spacer walls.

8. A machine for folding and erecting inner side walls on a partially erected carton having erected end walls and outer side walls with inner side wall forming flaps extending as continuations above said outer side walls, comprising, a conveyor having flights adapted to advance the cartons in endwise fashion, means laterally retaining said outer side walls along said conveyor, means mounted above the infeed end of said conveyor on opposite sides of said side flaps, said last means being overlapped to bend the upper ends of said side flaps inwardly into spacer flaps, side flap folding means mounted behind said spacer flap folding means and engageable with said side flaps to fold the same inwardly, a series of longitudinally spaced rollers positioned behind said side flap folding means with the outer edges of the rollers in the series positioned progressively outwardly from the center of the conveyor to progressively depress said side flaps, crimping means positioned behind said series of rollers to crimp the inwardly folded portions of said side flaps against the unfolded portions thereof, means positioned behind said crimping means and in the path of the crimped fold in said side flaps to fold the sub-adjacent portions-of the side flaps inwardly into top spacer walls, and shoes rotatable over said side wallsand swingable in timed relationship with said conveyor to the level of the donatisaidouter walls. to bend. said top, spacer walls to horizontal position, the inner side wall forming flaps being pressed against the bottom of the carton in spaced relation to the outer side walls by the top spacer walls.

9. A machine for folding a side flap extending at right angles from the bottom of a partially erected carton into spaced inner and outer side Walls spacedby upper and lower spacer walls, the flap being scored longitudinally to divide the flap into said wall portions, comprising, a conveyor adapted to advance the carton with said flap in upright longitudinally extended position,

I first folding means positioned to engage the outer edge of said flap and bend the bottom spacer wall laterally from the plane of the other wall portions of the flap, second folding means engageable with the outside of said flap at the inner side wall portion thereof to fold said side wall laterally from the plane of the outer wall and upper spacer wall portions extended, a fixed support engageable with the upper spacer wall portion in opposition to said second folding means, third folding means engageable with the laterally folded inner side wall to depress the same to an acute angle inwardly from the top spacer wall portion extended, fourth folding means engageable with the outside of the top spacer Wall portion to bend the same laterally inwardly from the top of the outer side wall, all said folding means comprising rollers rotatively engageable with the stated portions of said side flap with the periphery of each roller extending tangentially to the plane of the folded position of the flap portion, and mean including a shoe rotatable in timed relation to said conveyor and in the plane of said side wall extended to tangent to the top of said outer side Wall to depress said top spacer wall to horizontal position whereby the lower spacer wall and inner wall are swung downwardly and inwardly into erected engagement with the outer side wall and bottom respectively of the carton.

10. A machine for folding a side flap extending at right angles from the bottom of a partially erected carton into spaced inner and outer side walls spaced by upper and lower spacer walls, the flap being scored longitudinally to' divide the flap into said wall portions, comprising, a conveyor adapted to advance the carton with said flap in longitudinally extended position, first folding means positioned to engage the outer edge of said flap and bend the bottom spacer wall laterally from the plane of the other wall portions of the flap, second folding means engageable with the outside of said flap at the inner side wall portion thereof to fold said side wall laterally from the plane of the outer wall and upper spacer wall portions extended, a fixed support engageable with the upper spacer wall portion in opposition to said second folding means, third folding means engageable with the laterally folded inner side wall to depress the same to an acute angle inwardly from the top spacer wall portion extended, fourth folding means engageable with the outside of the top spacer wall portion to bend the same laterally inwardly from the top of the outer side wall, all said folding means comprising rollers rotatively engageable with the stated portions of said side fiap with the periphery of each roller extending tangentially to the plane of the folded position of the flap portion, and means to depress said top spacer wall to horizontal position whereby the lower spacer wall and inner wall are swung downwardly and in- 11 wardly into erected engagement with the outer side wall and bottom respectively of the carton.

11. A machine for folding a side flap extending at right angles from the bottom of a partially erected carton into spaced inner and outer side walls spaced by upper and lower spacer walls, the flap being scored longitudinally to divide the flap into said wall portions, comprising, a conveyor adapted to advance the carton with said flap in longitudinally extended position, first folding means positioned to engage the outer edge of said flap and bend the bottom spacer wall laterally from the plane of the other wall portions of the flap, second folding means engageable with the outside of said flap at the inner side wall portion thereof to fold said side wall laterally from the plane of the outer wall and upper spacer wall portions extended, a fixed support engageable with the upper spacer wall portion in opposition to said second folding means, third folding means engageable with the laterally folded inner side wall to depress the same to an acute angle inwardly from the top spacer wall portion extended, fourth folding means engageable with the outside of the top spacer wall portion to bend the same laterally inwardly from the top of the outer side wall, said third folding means comprising longitudinally spaced rollers rotatively engageable with the inner side wall portion of said side flap with the outer edges of successive rollers extending progressively outwardly and tangentially to the plane of the folded position of the inner wall portion, and means to depress said top spacer wall to horizontal position whereby the lower spacer wall and inner wall are swung downwardly and inwardly into erected engagement with the outer side wall and bottom respectively of the carton.

12. A machine for folding partially erected cartons having erected and connected side and end walls with a side flap extending from the side wall into spaced inner and outer side walls between said end walls spaced by upper and lower spacer walls, the flap being scored longitudinally to divide the flap into said wall portions, comprising, a conveyor adapted to advance the carton with said flap in upright longitudinally extended position, first folding means positioned to engage the outer edge of said flap and bend the bottom spacer wall laterally from the plane of the other wall portions of the flap, second folding means engageable with the outside of said flap at the inner side wall portion thereof to fold said side wall laterally from the plane of the outer wall and upper spacer wall portions extended, a fixed support engageable with the upper spacer wall portion in opposition to said second folding means, third folding means engageable with the laterally folded inner side wall to depress the same between said end walls to an acute angle inwardly from the top spacer wall portion extended, fourth folding means engageable with the outside of the top spacer wall portion to bend the same laterally inwardly from the top of the outer side wall, said third folding means comprising series of longitudinally spaced rollers rotatively engageable with said inner sidewall portion of said side flap with the outer end of each successive roller extending further outwardly of the conveyor, and means including a shoe rotatable in timed relation to said conveyor and in the plane of said side wall extended to tangent to the top of said outer side wall to depress said top spacer wall to horizontal position whereby the lower spacer wall and inner wall are swung 12 downwardly and inwardly into erected engagement with the outer side wall and bottom respectively of the carton.

13. A, machine for folding partially erected cartons having erected and connected side and end walls with a side flap extending from the side wall into spaced inner and outer side: walls between said end walls spaced by upper and lower spacer walls, the flap being scored longitudinally to divide the flap into said wall portions, comprising, a conveyor adapted to advance the carton with said flap in upright longitudinally extended position, first folding means positioned to engage the outer edge of said flap and bend the bottom spacer wall laterally from the plane of the other wall portions of the flap, second folding means engageable with the outside of said 'flap at the inner side wall portion thereof to fold said side wall laterally from the plane of the outer wall and upper spacer wall portions extended, third folding means engageable with the laterally folded inner side wall to depress the same between said end walls to an acute angle inwardly from the top spacer wall portion extended, fourth folding means engageable with the outside of the top spacer wall portion to bend the same laterally inwardly from the top of the outer side wall, said third folding means comprising series of longitudinally spaced rollers rotatively engageable with said inner side wall portion of said side flap with the outer end of each successive roller extending further outwardly of the conveyor, and means positioned to depress said top spacer wall to horizontal position whereby the lower spacer wall and inner wall are swung downwardly and inwardly into erected engagement with the outer side wall and bottom respectively of the carton.

14. A machine for folding partially erected cartons having erected side and end walls with a side flap extending from the side wall into spaced inner and outer side walls between said end walls spaced by upper and lower spacer walls, the flap being scored longitudinally to divide the flap into said wall portions, comprising, a conveyor adapted to advance the carton with said flap in upright longitudinally extended position, first folding means positioned to engage the outer edge of said flap and bend the bottom spacer wall laterally from the plane of the other wall portions of the flap, second folding means engageable with the outside of said flap at the inner side wall portion thereof to fold said side wall laterally from the plane of the outer wall and upper spacer wall portions extended, third folding means engageable with the laterally folded inner side wall to depress the same between said end walls to an acute angle inwardly from the top spacer wall portion extended,.fourth folding means engageable with the outside of the top spacer wall portion to bend the same laterally inwardly from the top of the outer side wall, said third folding means comprising series of longitudinally spaced rollers rotatively engageable with said inner-side wall portion of said side flap with the periphery of each roller extending tangentially to the plane of the flap portions, in progressively deflected positions, and means positioned to depress said top spacer wall to horizontal position whereby the lower spacer wall and inner wall are swung downwardly and inwardly into erected engagement with the outer side wall and bottom respectively of the carton.

15. A machine for folding and erecting inner side walls on a partially erected carton having erected end walls and outer side walls with inner 13 side wall forming flaps extending as continuations above said outer side walls comprising, a conveyor having flights adapted to advance the cartons in endwise fashion, means laterally retaining said outer side walls along said conveyor, a support mounted over said conveyor "at the infeed end thereof in spaced relation above said end walls and acting to laterally support the inner sides of said side wall flaps, first folding means mounted above said support and transversely engageable with opposite sides of said side flaps and overlapped to bend the upper ends of said side flaps inwardly into spacer flaps, side flap folding means mounted behind said first folding means and engageable with said side flaps to fold the same inwardly over the sides of said support, narrow extensions on the trailing end of said support, means positioned over said extensions and engageable with the outsides of the side flaps to bend said side flaps over said extensions, other means positioned behind said last means and engageable with the inwardly folded side flaps at points spaced longitudinally along the conveyor to progressively depress said side flaps and press the swinging ends thereof between said end walls, crimping means positioned behind said other means to crimp the inwardly folded portions of said side flaps against the unfolded portions thereof, top folding means positioned behind said other folding means and in the path of the fold in said side flaps to fold the subadjacent portions of the side flaps inwardly into top spacer walls, and shoes rotatable over said side walls and movable vertically in timed relationship with said conveyor to the level of the tops of said outer walls to bend said top spacer walls to horizontal position.

16. A machine for folding and erecting inner side walls on a partially erected carton having erected end walls and outer side walls with inner side wall forming flaps extending as continuations above said outer side walls comprising, a conveyor having flights adapted to advance the cartons in endwise fashion, means laterally retaining said outer side walls along said conveyor, a support mounted over said conveyor at the infeed end thereof in spaced relation above said end walls and acting to laterally support the inner sides of said side wall flaps, first folding means mounted above said support and transversely engageable with opposite sides of said side flaps to bend the upper ends of said side flaps inwardly into spacer flaps, side flap folding means mounted behind said first folding means and engageable with said side flaps to fold the same inwardly over the'sides of said support, other means positioned behind said last means and engageable with the inwardly folded side flaps at points spaced longitudinally along the conveyor to progressivelyv depress said side flaps and press the swinging ends thereof between said end walls, top folding means positioned behind said other folding means and in the path of the fold in said side flaps to fold the sub-adjacent portions of the side flaps inwardly into top spacer walls, and means over said side walls and movable vertically in timed relationship with said conveyor to the level of the tops of said outer walls to bend said top spacer walls to horizontal position.

JOHN D. BEHL.

No references cited.

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