US2280970A

US2280970A - Contracting mandrel

Info

Publication number: US2280970A
Application number: US362558A
Authority: US
Inventors: John G O'neil; Lawrence G Zesbaugh
Original assignee: NEIL O
Current assignee: NEIL O; O'NEIL
Priority date: 1940-10-24
Filing date: 1940-10-24
Publication date: 1942-04-28
Anticipated expiration: 1959-04-28

Description

Abril 281 1,942-

G. oNExL ET AL y 2,280,970

CONTRACTING MNDREL Filed Oct. 24, 1940 Y 2 SheeLS-SheI l April 28; 1942- J. G. o'NEll. ETAL GONTRCTING MANDREL Filed 001;. 24, 1940 2 sheets-sheet 2 Patented Apr.` 28, 1942 UNITED STATES PATENT OFFICE CONTRACTING MANDREL John G. ONeil, Faribault, and Lawrence G. Zesbaugh, Minneapolis, Minn.; said Zesbaugh assig-nor to `said GNeil y Application october 24, 1940, serial No. 362,553

` (ci. 24e- 72) 7 Claims.

`This invention relates to a `mandrel or a supporting member upon which flexible material maybe wound and while said `mandrel may have various applications,` it particularly is designed for use in the formation of a container made from flexible material.

It is an object of this invention to provide a mandrel or supporting member upon which ilexiblematerial such as paper may be Wound and which is constructed and arranged to be moved so that the diameter of its periphery is reduced to facilitate the removal of the material Wound thereon.

It isa further object of the invention to provide a mandrel comprising a plurality of segments forming a substantially continuous periphery but having longitudinal spaces therebetween and means whereby the diameter of said periphery may be reduced by a longitudinal movement of said segments.

. Itis another object of the invention to provide such a mandrel as above set forth in which the said segments are held in normal position by resilient means.

It is also an object of the invention t0 provide a` mandrel of simple and efncient construction which can be readily attached to anddetached from a carrying spindle; which mandrel may have either a cylindrical or lpolygonal periphery which may be readily reduced in diameter so that the material on the mandrel may be easily removed.

These and other objects and advantages of the invention `Will be fully `set forth in the following description made in connection with the accomof Fig. 1 asindicated by the arrows;

Fig. 5 is a vertical section taken on line 5-5 of Fig. 1 as indicated by the arrows;

Fig. 6 is a central longitudinal section through a removing sleeve; Fig. '7 is a View in end elevation as seen from theright of Fig. 6; and

Figs. 8, 9 and 10 are partial views similar to Fig. 1 illustrating the position of the material on the mandrel and the removal thereof by the sleeve shown in Fig. 6. i

Referring to the drawings, 4a mandrel or supporting member is shown comprising a central carrying` member or core 2li. While this member might take various forms, in the embodimentof the invention illustrated it is shown as a cylindrical shell having one end firmly secured to and mounted on a plug2l. Plug 2l is shown as reduced in diameter to receive shell 20 and provided with a shoulder against which the end of shell 2B engages. and threaded to receive or have screwed thereinto the threaded end 22a of a. carrying spindle 22. Spindle 22 is shown as having a supporting member 23 carried in a turret 24, `a portion only of which is shown. Plug 2l is exteriorly threaded and a supporting member 25 is interiorly threaded to be mounted on plug 2l. Member 25 can thus be moved longitudinally of member 2| by being rotated thereon. A locking nut 25e is threaded in member 25 and engages member 2 I, the same having slots 25d at its inner side adapted to receive a tool for turning the same. Member 25 has a periphery 25a which is tapered or which has a tapered or truste-conical surface; A plurality of segments 26 are provided, the end portions 26a of which are bent outwardly slight# ly and are supported upon the tapered surface 25a. The segments 26 are constructed and arranged to form a substantially continuous periphery but are spaced longitudinally.` While the `number of segments may be varied, in the embodiment of the invention illustrated three of such segments 26 are shown and these have longitudinal edges which are slightly spaced as shown in Figs. 4 and 5. The other ends of segments 26 have portions 28h which are offset inwardly a short distance. These end portions 2Gb are supported upon the periphery of ,a supporting member or collar 2l interiorly threaded to be screwed on the threaded periphery of shell 2D. Said member 21 has a periphery which is tapered or of frusto-conical form and this periphery tapers in the same direction as surface 25a of member 25. Member 25 is provided with a threaded portion 25h and a holding sleeve 28 has its end interiorly threaded to be screwed on member 25. Sleeve 28 has a lip or flange 28a extending inwardly and Which engages the segments 26 for holding the same on the supporting member 25. A ring 29 is mounted on the end of shell 20 and has a flaring or frusta-conical end 29a, the interior of which has a frusto-conical Plug 2| is interiorly bored` which it can be turned. Collar 3G forms in effect a jamb or lock nut for member 2l. A compression coiled spring 3l surrounds shell 2i), bearing at one end against collar 3G andlbearingV at its other end against a collar or washerl which in turn engages cylindricalmembersor studs-33 projecting inwardly from segments 26 respectively by having reduced portions riveted in said segments. l

In Fig. 6 a shell or sleeve 35 is shown and the same has formed therein a plurality of circumferentiallyl spaced slits or kerfs 36a Whichextend throughoutthe greater portion of the length of member 36. Member 33 is slightly flared at one endliib.

In operation, the mandrel is` brought'into the proper positionby movement of turret 24 and it has wound thereon one or more layers of material 38. In -practice this material hasbeen a: heavy glazed paper and a plurality of layers have been woundA onV the mandrel. After the paper has thus been wound on` the. mandrel it severed and gluedr so that there is a shell formed' which tightly embraces the mandrel. While the container shell might be removed in various ways, in practice the sleeve 36 has been used. This sleeve will have thereon a circular band 3ly of resilientmaterial so disposed as to give the desired tension on the portions between thekerfs 36a.. The material of the member 3'6 is, of course, resilient.. The member 3B is carried on a suitable carrier and at the proper time is movedlongitudinally over the container shell 33. It is arranged to fit thevshell tightly and to be moved thereover with some friction. It will thus have considerable grip on the shell and when it is moved outwardly .toward the end of the mandrel it grips .container shell 38 which is, of course, tightly gripping the segments 28. Container shell 38 is moved outwardly and-it moves with it the segments 26. This longitudinal movement of segments 26 causes the end portions thereof to move downwardly or inwardly along the tapered surfaces of members 25 and 2l and the diameter of the periphery formed by segments 26 is .thus reduced. The segments come L substantially into contact and due to the reduced diameter of said periphery container shell 38 is released from the segments and moves freely off. of the mandrel with member 35. The movement of segments 25 .takes place against the pressure of spring 3| which is slightly compressed in this action. Spring 3l acts to hold the sleeves 26 in their normal position. The periphery of the mandrel is thus easily and quickly reduced as the container shell wound thereon is removed. As soon as the shell is removed spring 3l moves segments 2'6 back to their normal position and the mandrel is ready to have another container shell wound thereon.

. From the above description it will be seen that we have provided a very simple and efficient mandrel and one especially useful in the making of a container from flexible material. The parts, of the mandrel are easily made and assembledand itl can bev very accurately adjusted. `It

is arranged so that it can be quickly placed on and removed from its supporting spindle. The device has been amply demonstrated in actual practice and found to be very successful and efcient.

It will, of course, be understood that various changes may be made in the form, details, arrangement andproportions of, the parts, without departing from thezscope of applicants invention, which generally stated, consists in a device capable of carrying out the objects above set forth, in the parts and combinations of parts l 1.v A. collapsible-mandrel having a substantially` continuous periphery adapted to have a sheet of flexible material Wound thereon and comprising a plurality'ofslightly longitudinally separated segments, a central core, spaced supporting means for and disposed at the ends of said segments mounted on and relatively adjustable on said core, said supporti-ng. means having conical surfaces tapered in the same .direction andresilient means surrounding said core holding said segments in position on saidrsupporting means whereby said segments may be moved longitudinally and will move on-saidtapered surfaces to reduce the diameter of the periphery thereof.

2. A collapsible mandrel having in combination, a pair of spaced supporting members, said members having con-ical surfaces both tapering in diameter in the same direction, a member on which said supporting members are carried, a plurality of segments having their end portions carried onsaid tapering surfaces, said segments having comparatively small thickness and forming a substantially continuous .periphery but being slightly separated longitudinally, annular members overlying the ends` of said segments for retaining them on said supporting members and resilient means between. said supporting members normally holding said segments in position whereby said segments may be moved against the pressure of said resilient means and move l on said tapering surfaces to reduce the diameter of the periphery thereof.

3. A collapsible. mandrel comprising acentral member adapted to be attached to a carrying spindle and comprising a cylindrical plug and tubular core carried thereby, spaced supporting members movably'mounted upon said plug and core respectively, the same having peripheries tapering in the same direction, a plurality of segments of. thin material having their end portions supported upon said tapering surfaces, spaced from said core andhaving spaced longitudinal edges, said segments forming a periphery'adapted to have a flexible sheet wound thereon, members overlying the ends of said segments for holding the samev on said supporting members and resilient means surrounding and supported on said core between said supporting members acting ron said segments normally holding the same in longitudinal position whereby said segments may be moved longitudinally againsty the pressure of said resilientmeans to move on said tapered surfaces to reduce the diameter of the periphery thereof'.

4. A collapsible mandrel having in combination, a central carrying member having an end portion adapted to be attachedto a spindleand a core carried by and projecting from said end portion, spaced supporting members mounted 'on said end member'and core respectively, the same having peripheral surfaces-tapering in the same direction, a plurality of longitudinally spaced segments having their end portions carried on said tapered surfaces and spaced from said core, rings for holding said end portions on said peripheries, a spring surrounding and supported on said core, means on said carrying member against which one end of said spring engages and means carried by said segments acted on by the other end of said spring whereby said spring acts to hold said segments in normal position and said segments may be moved longitudinally to move on said tapered peripheries and reduce the diameter of the periphery thereof.

5. A collapsible mandrel having in combination, a core member adapted to be attached to a supporting spindle, conical members at the ends of said core member having their surfaces tapering in the same direction, a shell of comparatively thin material formed of a plurality of slightly spaced longitudinally divided segments supported at their ends on said conical surfaces, a coil spring surrounding said core between said supporting members and members at the inner sides of said segments acted on by said spring to move said segments longitudinally.

6. A collapsible mandrel having in combination, a central member, supporting members at .the ends of said central member having conical surfaces, said surfaces tapering in the same direction, a shell formed of slightly spaced longitudinally divided segments supported at their ends on said conical surfaces and spaced from said central member, rings surrounding the ends of said segments respectively for holding the same on said surfaces, members secured to the inner sides of said segments and disposed between the same and said central member, a spring surrounding said central member and actuating on said last mentioned members to move said segments longitudinally on said surfaces, one of said supporting members being threaded on said central member for longitudinal adjustment thereon.

'7. The structure set forth in claim 6, a lock member for said last mentioned supporting member threaded on said central member, said spring having one end engaging said lool: member.

JOHN G. ONEIL. LAWRENCE G. ZESBAUGH.