WO2001038936A1 - Overhead pocket, and method for the production thereof - Google Patents
Overhead pocket, and method for the production thereof Download PDFInfo
- Publication number
- WO2001038936A1 WO2001038936A1 PCT/SE2000/000065 SE0000065W WO0138936A1 WO 2001038936 A1 WO2001038936 A1 WO 2001038936A1 SE 0000065 W SE0000065 W SE 0000065W WO 0138936 A1 WO0138936 A1 WO 0138936A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- overhead
- adhesive tape
- flap
- groove
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/132—Overhead projectors, i.e. capable of projecting hand-writing or drawing during action
Definitions
- the present invention relates to an overhead pocket.
- the invention also relates to a method and to an arrangement for manufacturing an overhead pocket in accordance with the invention.
- Overhead pockets in which overhead pictures or images can be kept and displayed without needing to take them out of the pocket are known to the art, for instance from U.S. Patent Specifications 4,402,585 and 5,622,420.
- These overhead pockets have fastened to their longitudinal edges flaps that can be folded out to cover the light gap that forms outwardly of the side edges when using overhead transparencies of A4-size on a generally square projection surface.
- the outwardly fold- able flaps are normally fastened with the aid of adhesive tape.
- the overhead pocket is positioned with the flaps facing downwards towards the projecting surface, there is a danger that adhesive on tape that is situated precisely in the folded part will ad- here to the glass plate, the projecting surface, of the overhead projector. This danger becomes greater when the overhead apparatus is used for a comparatively long time and the temperature of the glass plate increases accordingly.
- This object of the invention is fulfilled with an overhead pocket that includes outwardly foldable flaps which are fastened with the aid of adhesive tape that is provided with a groove that extends along the edge of the flap.
- Another object of the invention is to provide a method for the manufacture of such an overhead pocket in which the aforesaid problems associated with known overhead pockets are avoided.
- This object of the invention is achieved with a method of manufacturing such an overhead pocket in which a flap and adhesive tape are mounted on the overhead pocket and a groove is formed in the adhesive tape along the edge of the flap with the aid of a grooving roller.
- Still another object of the invention is to provide an arrangement for use in the manufacture of such an overhead pocket so that the aforesaid problems associated with known overhead pockets will be avoided.
- This object of the invention is achieved with an arrangement that includes a grooving roller for creating a groove along the edge of the pocket, in the manufacture of such an over- head pocket.
- At least part of the groove may be perforated.
- Fig. 1 illustrates an inventive overhead pocket schematically and from above
- Fig. 2 is a schematic illustration of an arrangement for manufacturing overhead pockets in accordance with the invention
- Fig. 3 is a schematic side view of an arrangement constructed in accordance with the invention.
- the overhead pocket 1 typically includes a double-folded plastic foil that forms the actual pocket.
- the overhead pocket is suitably of standard size, e.g. of A4-size, although it may, of course, have other sizes.
- Two outwardly foldable flaps 2 are attached to the long sides of the pocket. These flaps may either consist of light-impermeable material or of material that is fully or partially light permeable.
- the flaps 2 are fastened to the pocket 1 with the aid of elongate adhesive tapes 3. These tapes will conveniently extend in one piece along the full length of the pocket 1 and are fastened with approximately half their width to the pocket 1 and half their width to the flap 2.
- the flap 2 and the tape 3 may have punched in one long side of the pocket holes 4 that enable the overhead pocket to be placed in a folder, in a known manner.
- the adhesive tape 3 is provided with a groove 5 along the edge of its respective flap 2.
- the groove will preferably extend at least along a major part of the length of the tape, optionally along its full length.
- the groove 5 may also be perforated with holes that fully penetrate the tape 3 along parts of its length, in accordance with the invention.
- the perforations terminate short of the ends of the overhead pocket 1, as shown at 6, so that the tape 3 will obtain positive attachment to the material in the overhead pocket on the short sides of said pocket.
- FIG. 2 illustrates schematically an arrangement for manufac- turing an inventive overhead pocket. Only that part of the manufacturing process that relates to the invention is shown in the Figure.
- the web of mate- rial forming the body of the overhead pockets has already been folded and provided with flaps 2 on both of its longitudinal edges, said flaps 2 being fastened with the aid of adhesive tapes 3.
- the web is guided accurately in its cross- direction in a manner not shown and passes beneath two roll- ers 7 which are adapted for rolling abutment with the tape 3 precisely at the edge of the flap 2 on respective sides of the overhead pocket. This rolling abutment of the roller 7 with the tape 3 produces a groove 5 that extends along the adhesive tape adjacent the edge of the flap 2.
- Perforations can be made along the edge of the flap, by providing the roller 7 with cutting edges that will cut through the tape along parts of its length, so as to further facili- tate folding of the flap and ensuring that the flap will remain in its outwardly folded position.
- Fig. 3 is a side view of a roller 7 for use in producing a groove 5 that includes perforations along the transition of the adhesive tape 3 to the flap 2. Extending around parts of the circumference of the roller 7 are cutting edges 8 that cut through the adhesive tape 3. The cutting depth of the cutting edges is suitably chosen so that only the adhesive tape will be penetrated and so that the strip of material forming the overhead pocket will be left essentially untouched by the cutting teeth.
- the circumference of the roller 7 corresponds exactly to the length of the overhead pocket and also includes a gap or interruption 9 in the array of cutting teeth 8, so as to avoid perforation, penetration, of the adhesive tape 3 at the ends of the overhead pocket.
- the roller cir- cumference may correspond precisely to a multiple of the length of the overhead pocket, wherewith said circumference will then include a corresponding number of gaps or interruptions in the cutting teeth arrangement.
- An adhesive tape comprised of polypropylene film is consid ⁇ ered best suited for use in the invention, and will conveniently be transparent.
- adhesive tapes that are comprised of other materials, provided that said materials have the properties desired in accordance with the invention, i.e. effective adhesion, small stretch, flexibility and non- smearing, not even when heated.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Packages (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU32014/00A AU3201400A (en) | 1999-11-26 | 2000-01-14 | Overhead pocket, and method for the production thereof |
EP00909832A EP1234212A1 (en) | 1999-11-26 | 2000-01-14 | Overhead pocket, and method for the production thereof |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9904296A SE515291C2 (en) | 1999-11-26 | 1999-11-26 | Overhead pocket and method and apparatus for making such an overhead pocket |
SE9904296-2 | 1999-11-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001038936A1 true WO2001038936A1 (en) | 2001-05-31 |
Family
ID=20417875
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2000/000065 WO2001038936A1 (en) | 1999-11-26 | 2000-01-14 | Overhead pocket, and method for the production thereof |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1234212A1 (en) |
AU (1) | AU3201400A (en) |
SE (1) | SE515291C2 (en) |
WO (1) | WO2001038936A1 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4402585A (en) * | 1980-03-13 | 1983-09-06 | Minnesota Mining & Manufacturing Company | Envelope for transparencies for overhead projectors and like projecting apparatuses |
EP0732223A2 (en) * | 1995-03-16 | 1996-09-18 | Minnesota Mining And Manufacturing Company | Envelope for transparencies for overhead projectors |
-
1999
- 1999-11-26 SE SE9904296A patent/SE515291C2/en not_active IP Right Cessation
-
2000
- 2000-01-14 AU AU32014/00A patent/AU3201400A/en not_active Abandoned
- 2000-01-14 EP EP00909832A patent/EP1234212A1/en not_active Withdrawn
- 2000-01-14 WO PCT/SE2000/000065 patent/WO2001038936A1/en not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4402585A (en) * | 1980-03-13 | 1983-09-06 | Minnesota Mining & Manufacturing Company | Envelope for transparencies for overhead projectors and like projecting apparatuses |
EP0732223A2 (en) * | 1995-03-16 | 1996-09-18 | Minnesota Mining And Manufacturing Company | Envelope for transparencies for overhead projectors |
Also Published As
Publication number | Publication date |
---|---|
SE515291C2 (en) | 2001-07-09 |
SE9904296L (en) | 2001-05-27 |
SE9904296D0 (en) | 1999-11-26 |
AU3201400A (en) | 2001-06-04 |
EP1234212A1 (en) | 2002-08-28 |
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