Buckles – buttons – clasps – etc. – Bag fasteners – Resilient slot bag tie
Patent
1991-06-21
1993-09-28
Brittain, James R.
Buckles, buttons, clasps, etc.
Bag fasteners
Resilient slot bag tie
24 20CW, B65D 7718
Patent
active
052477231
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a U-shaped closing staple made of strip material and intended for use with bags and flexible tubes, and to a closing apparatus comprising a closing punch and a die. The closing staple consists of a crosspiece and two legs, which have outwardly bent ends and together with the leg ends of adjacent staples constitute a severable connecting web. To close a wrapper a portion of the bag or flexible tube consisting, e.g., of a filled sausage casing is gathered to form a condensed portion, which is inserted into the staple, which is held in a die that conforms to the crosspiece of the staple. Thereafter the legs of the staple are cut from the train of staples by means of a closing punch, which is moved against the die, and the condensed portion is thus closed by the staple in an operation in which the leg ends are forced against the legs on the outside.
As each staple is severed from the striplike train, burrs are formed at the parting line adjacent to the connecting web and if the strip width of the entire staple inclusive of the connecting web is approximately constant, as was the case in previously employed closing staples (German Patent Specification 10 78 495, Published German Application 26 06 658 and Published German Application 31 48 757), said burrs may laterally protrude beyond the strip width of the staple when the leg ends have been closed and forced against the legs on the outside so that the closed wrapper, such as the casing of a sausage, may be damaged. There is also a risk that other wrappers may be damaged during the further processing, e.g., by cooking. Finally, when the closed sausage is sealed into an evacuated second package the latter may be damaged by the burr and in such cases the user has often been induced to cut off the closing staple of the closed sausage before it was packaged in the second package. That additional operation is time-consuming and expensive.
For this reason the strip train of closing staples known from Published German Application 17 61 616 comprises connecting webs having on both sides an arcuate constriction, which is approximately symmetrical to the ideal parting line so that the width of the strip is reduced on both sides. It was intended thus to avoid a lateral protruding of burrs at the cut edges on the outwardly bent off leg ends after the closing operation. This has substantially been accomplished so that it was no longer necessary in many cases to cut the closing staple from the sausage, e.g., before a second packaging operation.
But it has been found that the bent off leg ends which constitute a part of the connecting web are not always forced by the closing punch against the legs on the outside thereof in a position in which said leg ends are centered with respect to the width of the strip. On the contrary, the closing operation may result in a slight canting so that the leg ends are somewhat laterally deflected and in that case again protrude laterally from the adjoining leg. This means that a protruding of burrs beyond the width of the strip has not been avoided with the reliability which is required.
It is an object of the invention to provide for bags and flexible tubes a staple closure which will ensure a reliable closing operation and has no burrs protruding beyond the width of the strip, and also to provide an apparatus which can be used to make such closure.
According to a first aspect of the invention that object is accomplished in that in a closing staple which constitutes a part of a striplike train of closing staples the strip width is decreased not only in the leg ends but also in a leg portion which adjoins the end and the outer edges of the ends and portions of the leg are approximately parallel in the region in which the strip width is reduced. Owing to their parallel edges the narrower legs can be guided during the closing operation in the severing and closing punch--e.g., by the side edges of the groove or such recess. This will not restrain the closing movement of the legs but their laterally outward deflection (o
LandOfFree
U-shaped closing staple for bags and flexible tubes does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with U-shaped closing staple for bags and flexible tubes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and U-shaped closing staple for bags and flexible tubes will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2183722