US1132283A - Apparatus for shaping cardboard tubes. - Google Patents

Description

J. W- PATON.

APPARATUS FOR SHAPING CARDBOARD TUBES.

APPLICATION FILED NOV. 29, 1913.

Patented Mar. 16, 1915.

THE NORRIS PETERS Ca. PHOTO-LITHO., WASHINGmN. D. c.

l lhl 1 TE STATg PATENT JAMES WALLACE EATON, OF LIVERPOOL, ENGLAND.

APPARATUS FOR SHAPING GAR-DBGARD TUBES.

Application filed November 29, 1913.

To all whom it may concern:

Be it known that 1, JAMES VVALLAOE PATON, a subject of the King of Great Britain, residingat Liverpool, in the county of Lancaster, in the kingdom of England, have invented certain new and useful Apparatus for Shaping Cardboard Tubes, of

vhich the following is a specification.

This invention relates to apparatus for shaping circular tubes of cardboard or like material into tubes of a permanently altered shape in cross section.

According to this invention, I take circular tubes of cardboard or the like. One way of producing these circular tubes is by winding paper suitably coated with adhesive in a number of convolutions around a suitable rotating mandrel, from which mandrel the finished tube is removed in any suitable manner, but this does not form a part of the present invention. When these cylindrical tubes of cardboard or like material have become hard or have set, they are by the present invention transformed in shape by subjecting them to a shaping and heating operation between a central mandrel or male die, and a co-acting outer tubular former or female die, while under intermittent longitudinal movement, both the said dies starting at the entrant end with a circular cross sectional outline, and gradually changing until at the exit end they correspond to the cross sectional outline it is desired the tubes shall present, a free space being left between the two dies correspond ing to the thickness of the tube blanks. This has the effect of not only transforming the shape of the tube, but also of compressing and solidifying the fibers of the cardboard or like material, so that when the tubes come out at the exit end, they have by means of these dies been strengthened and made more rigid, and this is in my view the only possible solution of the problem of satisfactorily transforming cardboard or like tubes into tubes of different shape.

The apparatus by which the circular tubes or blanks are transformed into the shape required at one operation will be understood from the following description, reference being had to the accompanying drawings, in which Figure 1 is a sectional elevation of such apparatus; and Fig. 2, a plan view thereof; Fig. 3 is a detail view of that part of the Specification of Letters Patent.

?at ented Mar. 116, 1915.

Serial No. 803,699.

apparatus which holds the tubular blanks in line with the shaping dies.

In these figures, the apparatus embodies a female shaping die 2 of suitable length, which is circular at one end 3 and of the same diameter as the external diameter of the circular tubes or tubular blanks l, but gradually and uniformly altering its shape from the circular end 3 toward the other end 4. (lo-acting with this female die 2, is a male shaping die 5 also circular at one end 3 but corresponding in diameter to the internal diameter of circular tubes or blanks 1. This also gradually and uniformly alters its shape from the circular end 3 toward the other end 4-. The female die 2 is a fixture being secured to the bed plate '3, but the male die 5 is mounted freely in the female one, and thus between these two dies, there is left a free space corresponding to the thickness of the tubular blanks 1, and the two dies in conjunction form a. matrix. For instance if the circular tubes are to be transformed. into rectangular on s having two oftheir sides wider than the other two sides, the two dies 2 and 5 would gradually change from the circular form into the rectangular form in cross section, the form at the delivery end 4 giving the final shape into which the tubes are to be transformed.

At one end of the female shaping die 2 (namely the circular end), a pair of half dies 7 and 31 are provided, into which the circular tubes are fed automatically by means of the sloping chute 28, down which such tubes or blanks can roll by gravity into the half die 7, so that they come to rest one by one in front of the circular end of the female die. One of these half dies 7 is a fixture, being supported on a suitable pedestal, but the other half die 31 is hinged thereto by a spring hinge 37, so that it can be opened on its hinge to receive a tubular blank, or closed to press a tubular blank down into the fixed half die, and insure it lying in line with the annular space between the shaping dies. The hinged half die is caused to open and close automatically at intervals by a revolving cam 33 working against roller 35 at the end of an arm 36 projecting from the hinged half die 31. In line witn the female die at the feeding end, is a plunger 8 adapted to be reciprocated either by means of a cam 9 or in other suitable manner, and the end of this plunger has blanks that have been previously pressed in,

a further length onward, and forcing the foremost or finished one out of the dies at the delivery end, the form of the final shape given to the tubes, depending entirely on the form of the dies at the delivery end. In line with the dies at the delivery end, is a reciprocating finger 11, adapted to come against the end of the male die 5, and form a stop, to pr vent the male die being driven out, at the moment when the plunger 8 is pushing the tubular blanks in between the dies. When the plunger 8 has pushed a tubular blank between the male and female dies, the plunger 8 moves back the cam 83 operates to open the half die 31 just far enough to allow another blank to roll down the chute 28, and escape into the space between the two half dies. half die 31 closes again by the action of a spring hinge, and presses the tubular blank between the two half dies, so that the tube is held in the exact position required to be forced between the shaping dies when the plunger moves forward again. This half die has a chamfer or bevel 39 at its edge, so that in closing it forces the succeeding tube in the chute 28 back clear of the said half die, and forms a stop which keeps the succeeding tubular blanks in the chute, and prevents them following the one that has escaped. The strip 38 prevents the blanks rising out of the chute 28. Simultaneously with the moving back of the plunger 8, the finger 11 at the other end reciprocates back also, and frees the shaped tube 1 that has been delivered from the dies, so that it can fall into a receiving hopper. The plunger 8 now moves forward again, pushing a tubular blank between the dies, pressing the tubular blanks already between the dies a step forward, and discharging the foremost one at the delivery end on to the finger 11, the tubular blanks being gradually and uniformly shaped during their longitudinal passage between the dies, and so the action is repeated each time the plunger reciprocates forward. The finger 11 moves against the male portion of the die, each time the plunger presses a tubular blank between the shaping dies, and so acts as a prop to prevent the male die 5 being driven out or becoming wedged, but it moves clear of the delivered tube simultaneously with the rear ward motion of the plunger 8, withdrawing itself from the finished tube which latter cannot follow owing to it coming against an abutment 12, and so frees a finished tube at each stroke. To prevent any liability of the delivered tube sticking to the adjacent one, a spring finger 13 may be provided The said hinged which pressing against the foremost or finished tube, forces it off the adjacent one, and compels it to fall down into the delivery receptacle when the finger 11 is drawn clear.

In the embodiment shown in the drawing, the sliding plunger 8 is guided in suitable bearings 14, and by the crosshead 15 sliding between the guide bars 16. The plunger is caused to slide by the stud l7 engaging the cam grooves 9 in the revolving drum, which is secured to the shaft 18 driven by the pulley 19. This shaft 18 has also fixed thereto the cam 33. The finger 11 is secured to the arm 20 adjustably fixed on the sliding rod mounted inbearings 22, and guided by the crosshead 23 sliding between the guide bars 24:. It also is caused to slide by'a stud 25 engaging the cam groove 9. The shape of this cam groove is such that the plunger 8 and finger 11 are caused to approach each other simultaneously to perform the functions herein before mentioned, also receded from each other simultaneously. 7 V

' The dies are heated by gas jets 26, or by steam jackets or in other suitable manner, so as to heat the tubular blanks 1 as they are shaped between the dies 2 and 5, and thus assist in the tubular blanks being permanently altered in shape; or if desired the lower part of the die 2 may be heated to a higher temperature than the'upper part, so as to give a greater permanent set to one part, than to another part.

The plunger 8 and its operating mechanism can be arranged to make a comparatively slow forward In vement, but a quick return, and allow sufficient interval for a tubular blank to take up its position, ready to be pushed between theshaping dies on the This can easily be effected by making the came groove 9 of the desired shape or curvature;

The female die 2' is made in two halves firmly clamped together, but capable of separation when required. 27 is a handle for lifting the top die off when unclamped from the lower half. The male die is supported centrally in the female die bythe tubular blanks 1, and endwise movement of the male die is prevented by the finger or stop 11 aforesaid. V 7 c c I declare that what I claim is 7 1. An apparatus for shaping circular tubes of cardboard or like material into rectangular or other suitable shapein cross section, comprising in combination I a central mandrel or male die and an outer tubular former or female die between which the 'tubes are longitudinally propelled, boththe said dies having at the entrant end a circular cross sectional outline with an annular space between corresponding to the size of the tube, and gradually changing until at the exit end they cor.-

respond to the cross sectional outline it is desired the finished tube shall present.

2. In apparatus for shaping circular tubes of cardboard or like material into rectangular or other suitable shape in cross section, the combination of a female die, a male die supported centrally within it by tubular blanks, means for heating the dies, a reciprocating plunger adapted to push the tubular blanks longitudinally into the space between the male and female dies, while at the same time pushing the tubular blanks which have been already pressed in, a further length outward, and a reciprocating finger located in line with the dies at the delivery end for preventing endwise move ment of the male die within the female one.

3. In apparatus for shaping circular tubes of cardboard or like material into rectangular or other suitable shape in cross section, the combination with a male die of a female shaping die, a pair of half dies located at one end of the female die means for feeding the tubular blanks automatically into said half dies, so that they come to rest one by one in front of the female shaping die.

4. In apparatus for shaping circular tubes of cardboard or like material into rectangular or other suitable shape, the combination of shaping dies one within the other, the inner one being supported centrally within the other by the tubular blanks, a pair of half dies at the entrant end to the shaping dies, one of which half dies is hinged to the other, a feeding chute for the tubular blanks, a cam for opening the hinged half dies to allow a blank to escape from the chute into the space between the half dies and close the same, and a bevel or chamfer at the edge of the hinged die for the purpose of pressing back the succeeding blanks in the chute from following the one that has escaped.

5. In apparatus for sha ing circular tubes of cardboard or like material into rectangular or other suitable shape, the combination with a female die and a male die supported centrally within it by the tubular blanks, of a reciprocating plunger adapted to push the tubular blanks between the dies, a reciprocating finger located in line with the dies at the delivery end and adapted to prevent the male die being driven out of the female die when the plunger at the other end is pushing the tubular blanks in between the dies.

6. In apparatus for shaping circular tubes of cardboard or like material into rectangular or other suitable shape, the combination with the female die and the male die supported centrally within it by the tubular blanks, a plunger for pushing the tubular blanks between the dies at the entrant end, and a reciprocating finger located in line with the dies at the delivery end, of an abutment located somewhat in advance of the delivery end of the dies and in such a position as to form a stop for the finished tubes that are discharged from the dies.

In testimony whereof I have hereunto signed my name this 20 day of Nov., 1913, in the presence of two subscribing Witnesses.

JAMES l/VALLACE PATON. l/Vitnesses:

G. C. DYMOND, W. WI-IOOBRIDGE.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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