US3676980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for wrapping bulky or stacked objects
Assignee: CARL DROHMANN GmbH
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Filing: 1970-06-12
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Granted: 1972-07-18
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Expires: 1990-06-12
Abstract
Abstract An apparatus for wrapping bulky objects, or objects stacked on pallets, by which a continuous length of flattened foil tubing is positively gripped at its leading end, is opened out, and this open end is drawn down over the objects to envelop them, whereafter jaws are brought into action automatically to seal and sever the section of enwrapping foil from the parent stock.
Inventors
- 👤 Walter Engelhardt
- 👤 Bruno Friedrich Bernhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:27
CPC Classifications
B; B65; B65B; B65B9/00; B65B9/10; B65B9/13; B65B9/135
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
175 words
In an apparatus for wrapping bulky objects or stacked groups of objects in packaging foils including a conveyor device for conveying the objects into the apparatus for temporary arrest therein, and a feed device for (feeding-in) a continuous length of foil tubing, the improvement comprising a foil transporting means for engaging the leading end of the infed foil tubing, for opening this end to a cross-section greater than the corresponding area of the objects on the conveyor device, and for drawing the opened end of the tubing a preselectable amount over said objects, and including a foil transverse welding and severing device arranged after said feed device and having means for applying a transverse seam to the foil tubing above said objects and for severing said tubing above this transverse seam, control means for controlling said foil transporting means for performIng the transporting operation in two steps, and for operating the transverse welding and severing device between these two steps for the application of the transverse welding seam and the severing of the foil tubing.
Claim 2
Dependent Claim
175 words
In an apparatus for wrapping bulky objects or stacked groups of objects in packaging foils including a conveyor device for conveying the objects into the apparatus for temporary arrest therein, and a feed device for (feeding-in) a continuous length of foil tubing, the improvement comprising a foil transporting means for engaging the leading end of the infed foil tubing, for opening this end to a cross-section greater than the corresponding area of the objects on the conveyor device, and for drawing the opened end of the tubing a preselectable amount over said objects, and including a foil transverse welding and severing device arranged after said feed device and having means for applying a transverse seam to the foil tubing above said objects and for severing said tubing above this transverse seam, control means for controlling said foil transporting means for performIng the transporting operation in two steps, and for operating the transverse welding and severing device between these two steps for the application of the transverse welding seam and the severing of the foil tubing.
Claim 3
Dependent Claim
44 words
Apparatus according to claim 1, further comprising an adjustably-positioned first switch which is operable by said transporting means, after it has performed one step of the transporting operation, to stop said transporting means and initiate the operation of said transverse welding and severing device.
Claim 4
Dependent Claim
43 words
Apparatus according to claim 2, characterized by the fact that there is arranged beyond said first switch a second adjustably-positioned switch operable by the transporting means on completion of the second step of the transporting operation to effect the termination of said operation.
Claim 5
Dependent Claim
34 words
Apparatus according to claim 1, in which said means engaging the leading end of the infed foil tubing comprises two parallel bars with suction openings connected to a suction pump through a control valve.
Claim 6
Dependent Claim
73 words
Apparatus according to claim 1, in which the foil transporting means further comprise pairs of chains in vertically-disposed, parallel loops arranged in mirror image fashion centrally of the conveyor device and of the objects standing ready for wrapping on the conveyor device, the upper parts of said pairs running at a small distance below said feed device and the lower parts of said pairs running at a greater distance above said conveyor device.
Claim 7
Dependent Claim
38 words
Apparatus according to claim 5, in which said chains run beneath the feed device first downwards and apart and then temporarily towards one another, and in which said transverse welding and severing device is arranged in this locality.
Claim 8
Dependent Claim
107 words
Apparatus according to claim 6, in which said feed device comprises a pair of draw rollers which can be opened and closed, a pre-winding arrangement disposed in advance of said draw rollers, and a pilot rod having means for engaging the end of a length of foil tubing and being secured to one of said chains and disposed parallel to the axis of said draw rollers, said pilot rod being movable from said prewinding arrangement, between the opened draw rollers to at least said transverse welding and severing device to introduce the leading end of a new length of foil tubing into effective position in the apparatus.
References Cited (Backward Citations)
US2751735A
Cited
US3210909A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |