US1973771A

US1973771A - Spool for adhesive tape

Info

Publication number: US1973771A
Application number: US488357A
Authority: US
Inventors: Wallace C Mills
Original assignee: JL Clark Manufacturing Co
Current assignee: Clarcor Inc
Priority date: 1930-10-13
Filing date: 1930-10-13
Publication date: 1934-09-18
Anticipated expiration: 1951-09-18

Description

Sept. 18, 1934. w c. L s 1,973,771-

SPOOL FOR ADHESIVE TAPE Filed Oct. 13. 1950 Patented Sept. 18, 1934 UNITED STATES PATENT OFFICE SPOOL FOR ADHESIVE TAPE Wallace 0. Mills, Rockford, Ill., assignor to J. L.

Clark Manufacturing Co Rockford, 111., a corporation of Illinois The invention pertains to spools for containing adhesive plaster or the like and has especial reference to a spool of small size constructed to permit of the application of the heads of -the spool to a metallictubular core after the adhesive plaster has been applied to the core.

The primary object of the invention is to provide an improved construction facilitating the application of the heads to the core while insuring that'the heads shall be firmly held in position.

A further object is to provide an improved core for spools formed from a fiat sheet of metal and embodying an improved method of interlocking the edges of the sheet at the extreme ends of the core.

Another object is to provide in a spool of this character a mode of connecting the heads of the ends of the tubular body such that the heads Imay be spaced from the ends of the roll of adhesive plaster carried by the body, thus permitting of the free and unrestricted unwinding of the tape from the spool. V

A general object is to provide a spool construction which is simple in character, capable of economical manufacture, and presenting a neat and attractive appearance.

In the accompanying drawing:

Figure 1 is a central longitudinal sectional:

view illustrating one embodiment of my invention, one of the heads being shown applied to the core and the other in position for assembly.

Fig. 2 is an end view of the core. Fig. 3 is a plan view illustrating the blank Jfrom which the core is formed.

Fig. 4 is a fragmentary sectional view taken on line 44 of Fig. 1 but on an enlarged scale,

and illustrating the manner of connecting the meeting edges of the sheet forming the core.

Fig. 5 is an elevational view of a core showing a diiierent embodiment of the invention.

Fig. 6 is an end view of the core shown in Fig. 5.

Fig. '7 is a plan view of the blank from which the core Figs. 5 and 6 is formed.

Referring first to Figs. 1 to 4, 8 designates generally a tubular core having applied thereto a roll 9 of adhesive plaster in tape form. At

opposite ends of the core are inturned curved portions, herein in the form of curls 10 of substantially circular cross section with which anchoring portions 11 on heads 12 are adapted to engage frictionally to hold the heads in position on the core.

The heads 12 are formed from flat metallic disks having peripheral strengthening curls 13, and each has a centrally depressed axial por tion or annulus in the form of an annular flange constituting the anchoring portions 11.

The core 8 is especially constructed to prevent expansion thereof upon the insertion of the annulus 11, and this is accomplished in the present instance by the construction more especially illustrated in Figs. 3 and 4. Thus the blank from which the core is formed, is serrated along opposite side edges to provide a row of teeth 14 of which the end teeth are spaced from the adjacent teeth to form end lugs 14: and 14 The spacing of these lugs from the adjacent teeth is such as to form notches 14. The length of the blank is such that the ends thereof may be overlapped, as shown in Fig. 4, a sufficient distance to permit the reception of the end lugs on the overlapping end of the blank into the notches 14 at the opposite end thereof when the lugs are curled inwardly. Thus as shownin Fig. 3, the end lugs l4 on the overlapping end portion of the blank are engaged in notches 14 atthe'opposite underlying end portion of the blank. Such inward curling of the lugs is accomplished at the same time that the serrations 14 are curled inwardly to form the curls 10,. the lugs being disposed in substantially the same circularplane as the serrations l4 and thus interlocked.

Preferably the width of each of the notches 14 at its base is somewhat narrower than the widthof the base of the lug received thereby so that the latter engages the sloping side walls of the notch and thus avoids any looseness in the interengagement after the curling operation.

In Figs. 5, 6 and. '7, I have illustrated another specific mode of forming the core. In this instance the ends of'the completed core are not curled inwardly so that the blank is provided only with lugs 15 and notches 16 which when the blank is rolledinto tubular form, as shown in Fig. 5, with its ends overlapping, may be bent into interengaging relation. As in the previous embodiment the lugs are carried by the overlapping end portion of the blank and when folded inwardly are adapted to engage with the notches in the underlying portion.

It will be observed that in the above embodiments of the invention, the core is positively held against expansion at the ends thereof, so that when the heads are applied to the end of the core, each annulus 11 upon being forced into the core may engage therewith with a snug or driving fit and thus be held firmly in position.

be held against expansion. A further advantage resides in the embodiment shown in Figs. 1 to 4: wherein the ends of the core are curled inwardly. Thus the interlocking lugs and notches do not add appreciably to the bulk'of the metal at the joint since the lugs while engaging in the notches are disposed in substantially the same plane as the inturned serrations or teeth 14. To permit of the unrestricted unwinding of the tape from the spool after the heads are applied thereto,- the latter are constructed to provide spaces between them and the ends of the rolls 9. This is accomplished by forming an axially offset'portion 17 in'each headat thebase of the annular anchoring flange-'11.

I claim as my invention: 1 1. A spool comprising a tubular metallic core and a head adapted to be secured on one end of the core and having an annulus projecting axially thereof for insertion intosaid end of the core, said core being formed from a sheet of metalbent into tubular form with portions overlapping at said end of the core, said overlapping portions being shaped to, provide respectively, a notch opening endwise of the core and ajlug bent into interengaging relation with the notch whereby to hold the end of the core against expansion.

2. A spool comprising a core formed from a sheet of metal having a, serrated'edgepsaid. sheet being bent into tubular'fo-rm with its op posite ends overlapping and having atitsrespective ends a notch and a lug, said serrated edgebeing curled inwardly: together with said lug with the lug interengagingin said notch whereby to hold'said end-of the corezagainst expansion, and a head having an annulus projecting axially thereof andinserted into saidend of the core in holding engagement therewith.

3; A tubular core for adhesive -plaster formed .from a sheet of metal having a serrated'edge portion and bent'into tubular form, said serrated edge pcrtion being bent to forma rounded end for the core, and the oppositeends of. saidserrated edge portion being. constructed to provide an interlocking joint for of the core.

4. A tubular core for adhesive plaster or the like, said core being formed from a sheet of metal having at one edge a. row of teeth with one .of said teeth near one end of the sheet spaced from its adjacent tooth so as to provide a notch, one of the teeth at the opposite end of the sheet forming alug'which isbent into engagement with said notch, and. the intermediate teeth being bent to provide a-rounded end for the core.

said rounded end 5. A tubular core for adhesive plaster rolls comprising a fiat sheet of metal bent into tubular form with its end portions overlapping, the edge of said sheet forming one end of the core being curved inwardly into the core, and the overlapping end portions of the sheet being provided-respectively with a-lug bent inwardly toether. with said curved edge portion of the sheet and a notch for receiving said lug.

6. A'metallic core for adhesive plaster rolls and the like comprising a sheet of metal having its opposite side edges serrated and. bent into tubular form with said serrated edge portions curled inwardly into the-ends of the core, said serrated portions terminating short of the ends of the sheet, and said ends of the sheet having respectively a notch and a lug bent inwardly into engagement with the notch.

7. A metallic core for adhesive plaster rolls and the like comprising a flat sheet of metal bent into tubular form, said ends of the sheet having-respectively a notch and alug bent inwardly into engagement with the notch, and said notch being of a width gradually decreas me; towards its base and said lug being. greater than the width of the base of the notch.

' 8. A spool comprising 'a tubular member formed from a flat sheet of metal to provide a metallic core for a roll of adhesive tape or the like, said core having its opposite ends bent inwardly, and heads for opposite ends of the core, each comprising a disk formed of sheet metal and having a central portion pressed axially thereof to form an integral annulus With a terminal portion adaptedto engage With one of said inturned ends of the core, each of said heads being disposed in a plane ofiset outwardly from the annulus to provide a space between the head and the adhesive plaster on the core. 9. A metallic core for adhesive plaster-spools, formed from'a flat sheet of metal bent into tubular form with overlapping end portions curled inwardly and axially of the core into interlocking relation to hold said end portions against'expansion;

=10. A spool comprising ahead having-an annulus projecting axially thereof, and a core formed from a sheet of metal bent into tubular form and having at one extreme end overlapping edge portions bent in a direction axially of the core into interlocking relation to prevent expansion of the core, said annulus being forced into holding engagement with said extreme end of the core.

11. A spool comprising a tubular metallic core