US3036502A

US3036502A - Method for making telescopic containers

Info

Publication number: US3036502A
Application number: US73805A
Authority: US
Inventors: William L Geist
Original assignee: RC Can Co
Current assignee: RC Can Co
Priority date: 1960-12-05
Filing date: 1960-12-05
Publication date: 1962-05-29
Anticipated expiration: 1979-05-29

Description

y 29, 1962 w. GEIST 3,036,502

METHOD FOR MAKING TELESCOPIC CONTAINERS Filed Dec. 5, 1960 4 Sheets-Sheet 1 INVENTOR. WILLIAM LGEIST BY ATTOFQNLYS May 29, 1962 w. L. GElST METHOD FOR MAKING TELESCOPIC CONTAINERS 4 Sheets-Sheet 2 Filed Dec. 5, 1960 INVENTOR. WILLIAM L. GEIST ATTORNEYS May 29, 1962 w. GEIST METHOD FOR MAKING TELESCOPIC CONTAINERS 4 Sheets-Sheet 3 Filed Dec. 5, 1960 ATTORNEYS 4 Sheets-Sheet 4 w. L. GEIST May 29, 1962 METHOD FOR MAKING TELESCOPIC CONTAINERS Filed Dec. 5, 1960 3,036,592 METHQD FOR MAKING TELESCOPIC CONTAENERfi Wiiiiarn i2. Geist, Ladue, Mo, assignor to RC. Can Company, St. Louis, Mo., a corporation of Missouri Filed Dec. 5, 1960, Ser. No. 73,865

14 Claims. (Cl. 93-94) This invention relates: to the art of paper container manufacture and more specifically to a novel method and apparatus applied to a paper tube manufactured by known processes to produce one or more tubes with a telescopic section concealed and held assembled by an outside wrapper or label. Such a tube may then be formed into a sealed container by sealing the ends of the tube.

The practice of the hereinafter disclosed methods by suitable apparatus form a paper tube with a telescopic section from a tube formed on a tube winding machine. The winding machine is set-up to wind a plurality of plies of paper into concentric tubes between which no adhesive is applied in order to form an inner tube separate and within an outer tube, which outer tube has a ply for a label or wrapper. In this respect, this invention is similar to that disclosed in my co-pending application Serial No. 834,001, filed August 17, 1959, for Telescopic Can and Label with Tear Strip and Method of Manufacture. This invention differs from the prior invention in that it pro vides economies in manufacture and increases the useful volume of the containers produced by this novel method. In other words, improved efliciencies are realized by the manufacturer and the user. In the practic of this novel method, a machine performs the tube making operation and winds a tube or tubes with :a plurality of plies some of which are adhesively secured to form an inner tube separate and within an outer tube which has an adhesively secured wrapper or label; a machine performs a stepping operation on the tubes after they are wound so as to deliver tubes with one end stepped externally and the other stepped internally an amount corresponding to the length of a telescopic section for the can body; a machine performs a perforating or scoring operation on the tubes both internally and externally; and a machine forces the inner tube into end to end relation with one end of the outer tube. As will be understood from the following detailed description, these machines may be combined or separate.

According to this method, a paper tube is constructed by sequentially or simultaneously winding a plurality of paper tapes into a paper tube so that a paper tube is wound having a plurality of plies of paper secured by a suitable adhesive into a separate inner tube within a separate outer tube which has a wrapper or cover for a label or the like, the tube so formed is severed into lengths containing a plurality of can bodies. The severing operation is accomplished by an external and internal cut through the outer tube and the inner tube, respectively, at displaced locations so that the inner tube projects beyond the end of the outer tube by an amount equal to the desired length of the telescopic section in a can body. The length of tube severed may be termed a stick, and the stick is then subject to a cutting and scoring operation from both the outside and the inside which is again a step forming operation defining individual can bodies with one end stepped externally and the other end stepped internally. The cuts are so made that each inner tube is slightly shorter than each outer tube for each can body, and the cutting operation trims the external stepped end of the stick on amount equal to this same small difference in length between the inner tube and the outer tube multipled by the number of can bodies in the stick. Each can body is then operated upon by a spanking machine or the like which knocks the inner tube into endwise alignment with the outer tube 2 at its lower end. This leaves a can body in which the outer tube at the upper end projects slightly beyond the inner tube. Can ends are then fastened to the body, to both the inner and outer tubes at the lower end, and to the outer tube only at the upper end. The slight difference in length between the inner and outer tubes at the upper end is such that the cover fastened to the upper end of the outer tube is flush with the upper end of the inner tube. Such a can can then be filled before the lower end is put on, and when so filled, the can contents, even though granular and semi-fluid, would not spill over the upper edge of the can after the cover is removed when the can is opened. Furthermore, the only waste is from a single trimming operation for an entire stick can and amounts to only a small increment of the amount of the can inner tube. For example, if there are eight can bodies in a stick and the difference in length between the inner and outer tubes is of an inch, the total waste is only of an inch from the inner tube. Thus, economies are affected in the manufacture and in the subsequent use, because the maximum volume of the can is available for the product.

One of the objects of this invention is to form a can with a telescopic section of the type described by a process which involves the minimum of waste.

Another object of this invention is to form a can of the type herebefore described with the maximum useable volume.

The following is a detailed description of the best mode or modes now contemplated by the inventor for carrying out his invention set forth in full, clear, concise and exact terms, such as to enable any persons skilled in the art to make and use the same when taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a side elevation of a can constructed according to the method disclosed in this application with parts broken away and in section to illustrate the interior construction;

FIG. 2 is a schematic illustration of a Winding machine for making paper tubes combined with a traveling pair of knives for performing the step forming operation to p cut off a stick of tubing from which the can bodies can be made;

FIG. 3 illustrates a stick of tubing as delivered from the machine shown in FIG. 2;

FIG. 4 is an end view of the stick of tubing shown in FIG. 3;

FIG. 5 is a schematic illustration of a machine or apparatus for performing the step forming cutting operation at the end of each can body in a stick of tubing, such as shown in FIGS. 3 and 4, and for performing the scoring operation on the outside of the stick for the individual tear strips on each can body;

FIG. 6 is a side elevation in section illustrating the stick of tubing with the cuts and scores performed in the machine shown in FIG. 5;

FIG. 7 illustrates in side elevation one of the tube sections separated from the stick of tubing shown in FIG. 6; and

FIG. 8 illustrates the same section of tubing as shown in FIG. 7 in transverse section after the spanking operation is performed at opposite ends to move the ends of the inner tube and outer tube into alignment.

Detailed Description of Can Construction Turning now to FIG. 1, a can is shown therein which is the final desired product obtained from the process or method steps hereinafter described as practiced by the use of the apparatus disclosed. The can, generally indicated as 1 in FIG. 1, is of the telescopic type in that the top portion of the body 1, such as indicated as 2, is separable from the bottom portion of the body, indicated as 3, after re- Patented May 29, 1962 i moval of a tear strip, such as 4, which is herein illustrated as partially peeled away along the preformed score lines 5 and 6 to expose the separation cut 7 which divides the body of the can into a so-called cover portion 2 separable from a body portion 3. The can 1 is formed on a helical tube winding machine from a plurality of paper tapes. The tapes are wound one upon the other to form a tube of a plurality of plies. Thus, the tube for the can body 1 is formed of one or more plies adhesively secured together to form an inner tube 9 and an outer tube 10. No adhesive is applied between the inner and the outer tubes however, so that one tube may be slid longitudinally within the other. Outer tube 10 has at least two plies, one of which is a wrapper or label 11. After the tubes have been wound in this manner, cutting and scoring operations are then performed thereon so that the can body has externally and internally stepped ends and is properly cut internally and scored externally so that when the bottom ends of the tube body for the can 1 are slid into alignment, the inner tube 9 is slightly shorter in length than the outer tube 10 so that when the cover 12 is applied to the upper end of the can 1, it can be attached to the outer tube 10 only, and will be positioned so that when the can is closed its lower surface lies against the upper edge of the inner tube 9. Score lines 5 and 6 in the outer label or wrapper 11 straddle the separation line 7 defining the lower edge of the cover of the can, indicated as 2. Preferably, the outer label has adhesive applied thereto except along the edges of the paper tape or metal foil, as the case may be, which form the helical wrapper defined by the lines 14 and 15. Thus, the portion 4 of the outer wrapper 11 may be readily peeled back, as shown in H6. 1, along the score lines 5 and 6. This frees the cover 2 from the body portion 3 of the can, and cover 2 may be removed by a twist and a pull.

The outer wrapper or label 11, as stated, is formed by spirally winding a paper tape or a metal foil tape, so that the edge of the tape overlap one another. Preferably the overlapping edges of the tape are left unglued. A strip of glue is applied at the center of the tape which sticks the tape to the adjacent ply, preferably of news surface paper. Since the edges are unglued, the edge of tear strip 4 can be lifted and then peeled off the adjacent ply. When the strip 4 is lifted, the overlap in the tape forming wrapper is revealed. The relative position of the edges ofthe tape in adjacent turns about the can body 1 is indicated by the

lines

15 and 16, 16 being the edge of the next turn of tape. There is also an end closure 17 for the can 1, which is, in this case, a metal closure similar to 12 which is rolled into engagement with both the inner tube 9 and the outer tube 10, preferably after the can 1 has been filled.

The construction, above described, represents economies in both manufacturing technique and economies in useable volume in the can. In the latter case, it is obvious that the can 1 may be filled completely and its entire inner volume used, since during opening, there will be no tendency for the material in the can to spill over the edges of the inner tube 9. This is because the telescopic section extends clear to the top of the inner tube 9. My prior invention, above referred to, diifers in that the telescopic section is located intermediate the ends of the container.

A method and an apparatus suitable for practicing the method will be hereinafter described by which tubes, such as shown in FIG. 1, may be obtained by the least number of operations and with the least amount of waste. For the purpose of simplification of this description, a por tion of an apparatus will be described first, and then the product obtained from this portion of the apparatus will be described but it should be understood that the several portions of apparatus described may, in fact, be a single machine.

Tube Winding and Cutofi Apparatus In the apparatus shown in FIG. 2, a machine base of some suitable kind supports a pair of parallel guideways,

such as 20 and 21, and various units in the apparatus are slidably supported longitudinally of the machine on these parallel guideways 20 and 21. At the left end of the guideways 20 and 21 is a chuck supporting framework, generally indicated as 23, and includes

transverse supports

24 and 25 at one end and 26 and 27 at the opposite end, each of these supports for the chuck supporting frame 23 are slidably supported on the guideways 20 and 21 by sleeves or the like 28, 29, 30 and 31, one located at the end of each of the supports. The chuck supporting framework also includes a plurality of radially and axially spaced adjustable clamps, such as 33, 34, and 36, which are movable radially for adjustment inward and outward by a plurality of clamping bolts 38, 39, 4t} and 41 which in turn screw into spaced arms 44 :and 45 extending from, and secured to the member 47. The clamping

members

33, 34, 35 and 36 may be moved inwardly to clamp and secure the tubular mandrel and are adjustable to different sizes of mandrel and form a chuck to hold the mandrel 50 against rotation and in any fixed adjusted longitudinal position along the ways 20 and 21.

Also mounted on the ways 20 and 21 is a framework 52 having

sleeves

53 and 54 embracing the ways 20 and 21. The outboard ends of the frame 52 carry rotatable. power driven pulleys 55 and 56 about which an elastic belt is looped as shown at 58. The motor for driving the pulleys 55 and 56 is indicated at 59. Ways 2 0 and 21 also carry a sleeve 60 and a sleeve 61. These sleeves may in turn support brackets 62 and 63 upon which spools. of paper tape are rotatably mounted, and from which rolls the tapes extend about the mandrel 50 between the mandrel and the elastic belt 58 so as to be helically' wound on the mandrel 50. The operation of the belt 58 draws the tapes from the individual rolls mounted on the brackets 62 and 63 and forms a multi-ply tubular helically' wound paper tube of a plurality of plies. In this case, only three tapes are shown, but it should be understood that the number of tapes wound is immaterial to the invention. These three tapes shown are merely for purposes of illustrations, but it is possible by overlapping the adjacent edges thereof to wind an inner tube separate and within an outer tube and apply to the outer tube a label or wrapper. In most instances however, five tapes. would be used, two wound in butt relationship at their edges and staggered to form the inner tube and the other three to form the separate outer tube with its wrapper. It is appropriate to point out here, however, that the apparatus so far described is a substantially conventional tube winding apparatus, although only schematically illus-- trated here. The structures, hereinafter described in this: apparatus, comprise the differences in construction which permit operation of the machine to perform the novel steps in this method.

At the left end of the guideway 20 is a sleeve 66 supporting a bracket 67 holding the motor 68 which can be adjusted along the position of the machine lengthwise; by movement of the sleeve 66 on the guideway 20. Suit able means, not shown, is provided for adjusting the posi-- tion of the motor 68. A pulley 69 driven by the motor 68 transmits power to a pulley 71 through a belt 70, and pulley 71 in turn drives a reciprocating rod 75 extending through the mandrel 50. There is a spline connection between the pulley 71 and the rod 75 so as to permit reciprocation of the rod 75 through the hub of the pulley 7'1 and the pulley is maintained against translation of the member 47. Pulley 69 is interchangeable so as to synchronize the speed of rotation of the reciprocating rod 75 with the speed of rotation of the paper tube as it leaves the mandrel 50. Rod 75 is reciprocated by a piston 76 in a cylinder 77 which has power connections, hereinafter described, to propel the piston 76 right and left within the cylinder 77. The opposite end of the rod 75 carries a pair of spaced mandrels 80 and 81 driven by the rod 75. Between the mandrels 80, 81 is a rotary cutter 32 rotated by the motor 68 with the mandrels 80,

81, and, of course, reciprocated by the rod 75 and the piston 76. A plurality of

sleeves

85, 86, 87 and 88 slidably mount a frame, generally indicated as 90, on the guideways 20 and 21. Sleeves 86 and 87 also pivotally mount pairs of brackets 92 and '94 which can rock inwardly and outwardly toward the mandrels 80 and 81. Brackets 92 have journals 93 rotatably supporting a shaft 95. On shaft 95 are a plurality of

rollers

96, 97 and 98 secured to the shaft and rotating therewith. A rotary cutter 99 is also mounted on the shaft 95, and the shaft is moved inwardly and outwardly in a rocking manner on the brackets 92 by a pitman 100 carrying a bearing sleeve 101 on the shaft 95 and propelled by a piston 102 in a cylinder 103 on the frame 90. Journalled in the brackets 94 is a shaft 106 carrying

rollers

107, 108 and 109 and rotary cutter 110, all of which are fixed to the shaft 106 and rotate therewith. Shaft 106 is rocked on its pivoted supports 94 toward and away from mandrels 80 and 81 by a pitman 112 which is propelled by a piston 113 in a cylinder 114, which pitman is connected to the shaft 106 by a sleeve bearing 115.

The frame 90 is reciprocated with the mandrels 80 and 81 by a power cylinder 120 in which is mounted a piston 121 connected to a piston rod 122 which in turn is attached to the frame 90 at 123. The cylinders 103 and 114' are synchronized to operate together and with the cylinders 77 and 120, and a circuit has been schematically shown to perform this function. The circuit comprises a pump and valve mechanism, such as illustrated at 125, which is driven by a separate electric motor 126. The valve mechanism 125 is timed by a photo electric cell 127 and supplies power alternately to opposite ends of the

cylinders

77, 103, 114 and 120 through a series of lines, such as 129 and 130.

Operation of the Tube Winding and Cutofi Apparatus The operation of the tube winding portion of the ma chine is conventional, and this description will be limited to the operation of the cutoff mechanism which is applied to this machine. As the paper tapes are wound into a paper tube, they progress from left to right from the belt 58 along the mandrel 50, the paper tube will be a continuous tube rotating at the speed of the belt 58 and moving along the mandrel 50 at a speed corresponding to the rotation and lead of the loop in the belt 58 about the mandrel 50. It is contemplated that the wrapper will carry a marker reflecting light upon the cell 127 which will initiate operation of the cutoff mechanism. The action of the cell 127 triggering the valve mechanism 125' will power all of the cylinders simultaneously so that the mandrel 80 and 81 will commence to move to the right at the speed at which the tube is delivered from the mandrel 50. Simultaneously, rollers 98 and 109 clamp the tube to the mandrel 80, and

rollers

107 and 96 clamp the tube to the mandrel 81.

Rollers

97 and 108 press the tube into contact with the rotary knife 82 between the driven mandrels 80 and 81, and the size of these rollers is such as to cause the knife 82 to cut through the inner tube to the outer tube. Also, simultaneously, knives 99 and 110 will cut the label and outer tube inwardly to the inner tube. As the frame 90 reaches the end of its righthand stroke, the valve 125 is triggered automatically to withdraw the

rollers

96, 97, 98 and knife '99 at one side of the frame and

rollers

107, 108 and 109 and knife 110 at the opposite side of the frame releasing the tube. At the same time, cylinder 120 withdraws the frame 90 toward the left at the same time that the mandrels 80 and 81 are withdrawn by the cylinder 77. After the stick of tubing is cut circumferentially by the

knives

82 and 99 along spaced lines, it then passes between a pair of rubber rollers or the like 140, one of which is shown. These rollers are driven by a shaft 141, one of which is shown, from a motor 142 at a much higher linear surface speed than the tube emerges from the mandrels 80 and 81 so that the externally stepped end on the emerging tube is withdrawn from the internally stepped end of the next succeeding tube section. The resulting product is illustrated in FIGS. 3 and 4. Thus, the apparatus, just described, will deliver a series of sticks of tubing, such as illustrated at S in FIG. 3, which are so cut by the

knives

99, and 82 as to have an internally stepped end, such as IS, and an eXternally stepped end, such as ES. Now returning to the description of FIG. 1, it will be remembered that the tubes consist of an inner tube, such as 9, composed of one or more plies of helically wound tapes and an outer tube, such as 10, also composed of a plurality of helically wound tapes, one of which, 11, is a wrapper or label. Thus, with reference to FIG. 4, it will be seen that this construction is obtained from the apparatus described, and no adhesive is applied between the inner tube 9 and the outer tube '10 so that they may be readily slid endwise with respect to one another. Of course, the one or more plies forming inner tube 9 are adhesively secured and the two or more plies forming the outer tube are also adhesively secured.

Scoring and Cutting Apparatus The apparatus, illustrated schematically in FIG. 5, performs the next series of operations on the stick of tubing S. Referring specifically to FIG. 5, a fixed bearing or journal, such as illustrated as 150, rotatably supports a mandrel, generally indicated as 151, which has a plurality of driven

rotary cutters

152, 153, 154, 156, 157, 158 and 159. The mandrel 151 and the cutters, above mentioned, are driven by a pulley 160 through a belt 162 from a pulley 163 on the motor 164. A shaft 166 is mounted for movement toward and away from the mandrel 151 in

bearings

168 and 169 carried by piston rods 170 and 172 operated by

power cylinders

174, 175. Pistons 176 and 177 within the power cylinders 174 and reciprocate the

bearings

168 and 169 to move the shaft 166 toward and away from the mandrel 151. On the shaft 166 are a plurality of cutters 180-187, inclusive, which rotate with the shaft 166. Also mounted on the shaft 166 are a plurality of rollers through 197, inclusive, spaced between the cutters 180-187, inclusive. Rollers 190-197 are located immediately opposite the cutters 152-159, inclusive.

A shaft 200 is mounted for movement toward and away from the mandrel 151 by bearings 201 and 202 carried by piston rods 203 and 204 operated by

power cylinders

205 and 206. On the ends of the rods 203 and 204 are

pistons

207 and 208 which move the rods 203, 204 and bearings 201 and 202 carrying the shaft 200 toward and away from the mandrel 151. Preferably, a power system is provided for the

cylinders

174, 175 and 205, 206 which will simultaneously move the

shafts

166 and 200 inwardly toward the mandrel 151 and outwardly away from the mandrel in synchronism. On the shaft 200 are a pluraliy of spaced perforating knives or scoring knives 210 through 225, inclusive, which are pressed into engagement with the outside of a stick of tube S when placed on the mandrel 151 to perform the operation of scoring the label or wrapper to form individual tear strips between each pair of perforating or scoring knives 210211, 212-213, etc., along the length of the stick S of tubing.

Operation of Tube Cutting and Scoring Apparatus In the apparatus just described, the knives 180 through 187, inclusive, when forced up against a stick of tubing, such as S, on the mandrel 151 will cut through the outer tube and wrapper to the iner tube '9 except for cutter 180 which trims off a portion of the externally stepped end of stick 8. The amount of trim removed by the cutter 180 from the externally stepped end ES of the stick S represents the total waste in the manufacture according to this method. The knives 180 through 187, inclusive are spaced apart equal distances, and these distances represent the total length of a finished can body 1, such as shown in FIG. 1. The rollers 190 through 197 on the shaft 166 force the tube wall of the stick of tubing S into engagement with the knives 152 through 159, inclusive, and these knives in turn out through the inner tube and the outer tube to the wrapper or label 11. These knives in turn are spaced along the mandrel 151 in such a way that the spacing between the knives 152 to 153, 153 to 154-, etc., is of an inch shorter than the spacing between the knives 186i, 181, etc., all for a purpose which will be hereinafter described. The scoring knives 210 through 225, inclusive, are spaced in pairs, such as 210-211 and 212-413, etc., and these pairs are spaced equally the same distance as the length of a can body which in turn corresponds to the spacing between the individual knives 180, 181, etc., on the shaft 166. it will therefore be obvious from an examination of FIG. 5, that the one knife 159, for example, is closer to the scoring knife 224 in the pair of score knives 2'24 and 225 at the right end of the apparatus than the knife 152 is to the scoring knife 211i in the pair of knives 210, 211 at the opposite end of the apparatus. The operation performed upon the stick S, therefore, is a multiple cutting scoring operation and the resulting product is illustrated in FIG. 6, for example. The stick S is telescoped over the mandrel 151 until the internally stepped end IS fits over the enlarged section of the mandrel 151 adjacent the pulley 160. Scoring or perforating knives then leave the pairs of scores 2108-2118 and 212SZ13S, etc., which correspond to the same numbers on the scoring knives 210 through 225, inclusive. The knives 180 through 187, inclusive, perform the cuts 180C, 131C, etc., along the length of the tube to 187C, being the final out at the right. The cut 180C determines the amount of waste, as above pointed out, and represents the effect of the trimming operation performed by the knife 180. Knives 152 through 159, inclusive, perform the cuts 152C through 159C.

Subsequent to the above cutting scoring operation, the individual tubes are separated from the stick S, and this can be accomplished by suitable machinery or by hand, which will separate the tubes at the lines 152C, 181C, at the lines 153C, 132C, at the lines 154C, 1830, at th lines 155C, 184C, at the lines 156C, 185C, at the lines 157C, 136C, and at the lines 158C and 187C. When so separated, the tube bodies will appear as in FIG. 7, and for purposes of illustration, the cuts determining the length are numbered the same in FIG. 7. The score lines in the Wrapper are also numbered the same. A a final step, the inner tube 9 is aligned with the outer tube 10, as shown in FIG. 8, by placing the tube in a spanking machine which knocks the inner tube 9 within the outer tube 10 so that the ends of the

tubes

9 and 10 are even at the bottom but are offset of an inch at the top. Metal ends can be applied to the outer tube 19 at the top and the can is then ready to be filled and the lower end closed by the metal end 17, as shown in FIG. 1, In each of the can bodies so formed, the inner tube 9 will be inch shorter than the outer tube 10, and, of course, the 7 of an inch here used is exemplary. The same process could be used to make the inner tube longer than the outer tube.

Changes in and modifications of the construction described may be made Without departing from the spirit of my invention or sacrificing its advantages.

Having thus described the invention, What is claimed and desired to be secured by Letters Patent is:

l. The method of manufacturing a paper can body with a telescopic section from a paper tube constructed by winding a plurality of paper tapes into a plurality of paper plies to form the paper tube With a separate inner tube within a separate outer tube, comprising, the steps of performing a step forming operation on said paper tube so that the inner tube projects from one end and the outer tube projects from the opposite end and one of said tubes is longer than the other, to form a tube with an internally stepped end and an externally stepped end with one of said stepped ends longer than the other,

making a circumferential cut in the longer tube adjacent one stepped end at a location therein which will leave the cut tube supported on the other tube, and then slipping the inner tube with respect to the outer tube to eliminate one of said stepped ends so that an end Wall can be applied to the projecting end of the longer tube.

2. The method of manufacturing a paper can body with a telescoping section from a paper tube constructed by winding a plurality of paper tapes into a plurality of paper plies to form the paper tube with a separate inner tube within a separate outer tube, comprising the steps of performing a step forming operation on said paper tube so that the inner tube projects from one end and the outer tube projects from the opposite end and the outer tube is longer than the inner tube to form the tube with an internally stepped end and an externally stepped end with one of said stepped ends longer than the other, making a circumferential cut in the longer tube adjacent one stepped end at a location therein which Will leave the cut tube supported on the other tube, and then slipping the inner tube with respect to the outer tube to eliminate one of said stepped ends so that an end wall can be applied to the projecting end of the longer outer tube.

3. The method of manufacturing a paper can body with a telescoping section concealed by a label or cover, from a paper tube constructed by winding a plurality of paper tapes into a plurality of paper plies to form the paper tube with a separate inner tube within a separate outer tube with the cover ply or label, comprising the steps of performing a step forming operation on the paper tube so that the inner tube projects from one end and the outer tube projects from the opposite end and one of said tubes is longer than the other to form the tube with an internally stepped end and an externally tepped end and with one of said stepped ends longer than the other, making a circumferential cut in the longer tube adjacent one stepped end at a location therein which will leave the cut tube supported, and then slipping the inner tube with respect to the outer tube to eliminate one of said stepped ends so that an end wall can be applied to the projecting end of the longer tube,

4. The method of manufacturing a paper can body with a telescoping section concealed by a label or cover from a paper tube constructed by winding a plurality of paper tapes into a plurality of paper plies to form the paper tube with a separate inner tube. within a separate outer tube having a cover ply or label, comprising the steps of performing a step forming operation on said paper tube so that the inner paper tube projects from one end and the outer paper tube projects from the opposite end and the outer paper tube is longer than the inner paper tube to form the tube With an internally stepped end and an externally stepped end and with one of said stepped ends longer than the other, making a circumferential cut in the longer tube adjacent one stepped end at a location therein which will leave the cut portion of the tube supported on the other tube by cutting from the inside of said outer tube outwardly to said label, and then slipping the inner tube with respect to the outer tube to eliminate one of said stepped ends so that an end Wall cag be applied to the projecting end of the longer outer tu e.

5. The method of manufacturing a paper can body with a telescoping section concealed by a cover or label from a paper tube constructed by winding a plurality of paper tapes into a plurality of paper plies to form the paper tube with a separate inner tube within a separate outer tube having the cover ply or label, comprising the steps of performing a step forming operation on said paper tube so that the inner tube projects from one end and the outer tube projects from the opposite end and one of said tubes is longer than the other, to form a tube with an internally stepped end and an externally stepped end and with one of said stepped ends longer than the other, making a circumferential cut in the longer tube adjacent one stepped end at a location therein which will leave the cut tube supported on the other tube, making a score in said label to define a tear strip adjacent said circumferential cut, and then slipping the inner tub with respect to the outer tube to eliminate one of said stepped ends so that an end wall can be applied to the projecting end of the longer tube.

6. The method of manufacturing a paper can body With a telescoping section concealed by an outer Wrapper or label from a paper tube constructed by Winding a plurality of paper tapes into a plurality of paper plies to form the paper tube with a separate inner tube within a separate outer tube having the cover ply or label, comprising the steps of performing a step forming operation on said paper tube so that the inner tube projects from one end and the outer tube projects from the opposite end and the outer tube is longer than the inner tube to form a tube with an internally stepped end and an externally stepped end and with one of said stepped ends longer than the other, making a circumferential cut from the inside of said outer tube outwardly to said label adjacent one stepped end at a location therein which will leave the cut tube supported by the label or wrapper ply, scoring said wrapper or outer ply opposite said circumferential cut to form a tear strip, and then slipping the inner tube with respect to the outer tube to eliminate one of said stepped ends so that an end wall can be applied to the projecting end of the longer outer tube.

7. The method of manufacturing paper can bodies with telescoping sections therein from a paper tube constructed by winding a plurality of paper tapes into a plurality of paper plies to form the paper tube with a separate inner tube within a separate outer tube, comprising the steps of performing a step forming operation by cutting said tube internally and externally at spaced locations circumferentially of the inner tube and the outer tube respectively to form a tube stick long enough to contain a g'ven number of tubes for individual can bodies having an internally stepped end and an externally stepped end, performing a plurality of step forming operations by internal and external spaced cuts in the inner tube and the outer tube respectively to form separate tubes from said tube stick with one of said separate inner or outer tubes long enough for a can body and with one of said separate inner or outer tubes shorter than a can body and with an externally stepped end and an internally stepped end and one of said stepped ends longer than the other, making a circumferential cut in the longer tube adjacent one stepped end therein, and then slipping the separate inner tube within the separate outer tube to eliminate one of said stepped ends so that an end Wall can be applied to the projecting end of the longer tube.

8. The method of manufacturing paper can bodies with telescoping sections therein from a paper tube constructed by winding a plurality of paper tapes into a plurality of paper plies to form the paper tube with separate inner tube Within a separate outer tube, comprising the steps of performing a step forming operation by making spaced cuts internally outwardly and externally inwardly in the inner tube and the outer tube respectively to form a tube stick long enough to contain a given number of tubes for individual can bodies having an internally stepped end and an externally stepped end, per-forming a plurality of step forming operations by making internal and external spaced cuts in the inner tube and the outer tube respec tively with the external cuts spaced the length of a tube body for a can and the inner internal cuts spaced a length less than a tube body for a can and with an internally stepped end and an externally stepped end on each separate tube with one of said stepped ends longer than the other, making a circumferential cut in one of said separate tubes adjacent one stepped end therein Which will leave the cut tube supported on the other tube, and then slipping the inner tube with respect to the outer tube to eliminate one of said stepped ends so that an end wall can be applied to the projecting end of the longer tube.

9. The method of manufacturing paper can bodies with telescoping sections concealed by a wrapper or cover from a paper tube constructed by winding a plurality of paper tapes into a plurality of paper plies to form the paper tube with a separate inner tube within a separate outer tube having a cover ply or label, comprising the steps of performing a step forming operation by making spaced cuts internally and externally in the inner tube and the outer tube respectively to form a tube stick long enough to contain a given number of tubes for individual can bodies having an internally stepped end and an externally stepped end, performing a plurality of step forming operations along said tube stick by making internal and external spaced cuts in the inner tube and the outer tube respectively with the cuts in the outer tube spaced the length of a tube body for a can and the cuts in the inner tube spaced apart a length less than the length of a tube body for a can and with an externally stepped end and an internally stepped end and one of said stepped ends longer than the other, making a circumferential cut in the longer outer tube adjacent one stepped end therein which will leave the cut portion of the tube supported by the cover ply or label, and then slipping the inner tube with respect to the outer tube to eliminate one of said stepped ends so that an end wall can be applied to the projecting end of the longer outer tube.

10. The method of manufacturing paper can bodies with telescoping sections therein concealed by an outer cover or wrapper from a paper tube constructed by winding a plurality of paper tapes into a plurality of paper plies to form the paper tube with separate inner tube within a separate outer tube covered by a cover ply or label, comprising the steps of performing a step forming operation by spaced internal and external cuts in the inner tube and the outer tube respectively to form a tube stick long enough to contain a given number of tubes for individual can bodies having an internally stepped end and an externally stepped end, performing a plurality of step forming operations by making internal and external spaced cuts in the inner tube and the outer tube respectively to form separate tubes from said tube stick with an externally stepped end and an internally stepped end, said external cuts being spaced the length of a tube body for a can and said internal cuts being spaced a slightly lesser amount one from the other so that one of said stepped ends is longer than the other, making a circumferential cut in the longer outer tube adjacent one stepped end therein which will leave the cut portion of the tube at the stepped end supported by the cover ply or label, scoring said outer cover ply at spaced points on either side of said circumferential cut, and then slipping the inner separate tube with respect to the outer separate tube to eliminate one of said stepped ends so that an end wall can be applied to the projecting end of the longer outer tube.

11. The method of manufacturing paper can bodies with telescoping sections therein concealed by an outer cover ply or label from a paper tube constructed by winding a plurality of paper tapes into a plurality of concentrio paper tubes to form the paper tube with a separate inner tube within :a separate outer tube having a cover ply or label, comprising the steps of forming lines of separa tion through the paper tapes forming the paper tubes alternately along the length of the tube at spaced intervals through the inner and outer tube to the cover ply and through the cover ply and outer tube to the inner tube with the last said lines of separation spaced a slightly greater distance apart than the first said lines of separation, separating the inner and outer tubes together as separate units along said lines of separation to form individual tubes with an externally stepped end and an internally stepped end and then slipping the inner tube with respect to the outer tube to eliminate one of said stepped ends so that an end wall can be applied to the projecting end of the longer tube.

'12. The method of manufacturing paper can bodies with telescoping sections therein concealed by an outer cover ply or label from a paper tube constructed by winding a plurality of paper tapes into a plurality of concentric paper tubes to form the paper tube with a separate inner tube Within a separate outer tube having a cover ply or label, comprising the steps of forming lines of separation in the paper tapes forming the tubes alternately along the length of the tube at spaced intervals through the inner and outer tube to the cover ply and through the cover ply and outer tube to the inner tube With the last said lines of separation spaced a slightly greater distance apart than'the first said lines, making score lines on either side of the first said lines of separation in the cover ply, separating the inner and outer tubes together as separate units along said lines of separation to form individual tubes with an externally stepped end and in internally stepped end and the slipping the the inner tube with respect to the outer tube to eliminate one of said stepped ends so that an end Wall can be applied to the projecting end of the longer separate tube.

13. The method of manufacturing paper can bodies with telescoping sections therein concealed by an outer cover ply or label from a paper tube constructed by winding a plurality of paper tapes into a plurality of concentric tubes to form the paper tube with a separate inner tube within a separate outer tube having a cover ply or label thereon, comprising the steps of successively severing tube sticks from said tube as it is Wound by a pair of knives with fixed relative spacing form-ing respectively a cut through the inner tube to the outer tube and a cut through the outer tube to the inner tube so as to separate successive tube sticks with an externally stepped end and an internally stepped end, forming lines of separation in said tube stick spaced alternately along the tube stick at spaced intervals by knives having a fixed relative spacing and arranged to cut through the inner and outer tube to the cover ply and through the cover ply and outer tube to the inner tube With the last said lines of separation spaced a slightly greater distance apart than the first said lines of separation, separating the inner and outer tubes together as separate units from said tube stick along said lines of separation to form individual tubes with an externally stepped end and an internally stepped end and then slipping the inner tube With respect to the outer tube to eliminate one of said stepped ends so that an end wall can be applied to the projecting end of the longer tube.

14. The method of manufacturing paper can bodies with telescoping sections therein, concealed by an outer cover ply or label from a paper tube constructed by winding a plurality of paper tapes into a plurality of concentric paper tubes to form the paper tube with a separate inner tube within a separate outer tube having a cover ply or label, comprising the steps of successively severing tube sticks from the tube as it is Wound by a pair of knives with fixed relative spacing forming respectively a cut through the inner tube to the outer tube and a cut through the outer tube to the inner tube so as to separate successiVe tube sticks With an externally stepped end and an internally stepped end, forming lines of separation in said tube stick alternately along its length at spaced intervals through the inner and outer tube to the cover ply and through the cover ply and outer tube to the inner tube with the last said lines of separation spaced a slightly greater distance apart than the first said lines of separation, scoring said cover ply on either side of said first said lines of separation to form a tear strip, separating the inner and outer tubes together as units from said tube stick along said lines of separation to form individual tubes for a can body with an externally stepped end and an internally stepped end, and then slipping the inner tube With respect to the outer tube to eliminate one of said stepped ends so that an end *Wall can be applied to the projecting end of the longer outer tube.

References Cited in the file of this patent UNITED STATES PATENTS 2,966,101 Fienup Dec. 27, 1960 UNITED STATES PATENT OFFICE CERTIFICATE. OF CORRECTION Patent No. 3,036,502 May 29, 1962 William L. Geist It is hereby certified that error appears in the above numbered petent requiring correction and that the said Letters Patent ehould read as corrected below.

Column 3, line 38, for "edge" read edges column 4 11ne 65, for "of" read by column 6, line 67, for "nor" read inner column 11, line 17, for "in" reagh" an line 18., for "the", first occurrence, read Q same 11ne l8, strike out "the", second occurrence.

Signed and sealed this 16th day of October 1962.

(SEAL) Attest:

ERNEST w. SWIDER DAVID LADD Attesfing Officer Commissioner of Patents