Two-part plastic clip for closing sausage casings, bags or the l

Details Two-part plastic clip for closing sausage casings, bags or the l Two-part plastic clip for closing sausage casings, bags or the l

1994-07-25

1996-08-20

Cuomo, Peter M.

Buckles, buttons, clasps, etc.

Bag fasteners

Resilient slot bag tie

B65D 7710, F16L 5500, A22C 1112

Patent

active

055466370

DESCRIPTION:

BRIEF SUMMARY
This invention relates to a plastic clip which serves to close sausage casings, bags or the like and consists of two parts, which embrace the wrapper end that has been gathered to form a tip and are adapted to be interlocked, and the tip is deflected in wave shape by at least one inwardly directed projection and is subjected to an applied pressure when the clip is in its interlocked closed state.
Such a plastic clip is known, e.g., from German Patent Specification 10 23 693. In that case one part consists of a capsule, which is circular in a top plan view and adjacent to mutually opposite sectors of its periphery is provided with correspondingly curved uprights on a substantially flat bottom. The tip of the wrapper end is inserted between the uprights and is fixed by being clamped by a cover, which constitutes the second clip part and interlocks with detent projections at the top edges of the uprights. A pin which is integrally formed with the bottom of the first part forces the tip in wave shape into a corresponding recess of the cover part.
A problem arising in connection with such plastic clips resides in that the pressure which is applied by them to the wrapper material (i.e., the pressure which is applied by the clip after it has been closed) is determined by the geometrically defined size of the passage which is left free by the two parts when they have been closed. For this reason any change of the volume of the wrapper material which extends through that passage as a tip will result in a corresponding change of the pressure applied. In addition to the fact that it is not possible to make clips of a separate size for each wrapper size, even small differences in the thickness of the wrapper material will exert possibly detrimental influences on the pressure applied. If the tip volume is too large it will no longer be possible to cause the cover to snap behind the detent projections at the uprights of the capsule. If the tip volume is too small the required (hermetically) tight seal of the package will no longer be ensured.
For this reason it has been attempted to eliminate that disadvantage, which is ascribed to the interlock between the two clip parts, and to achieve this in that the wrapper tip is inserted into a bar which is bent in U-shape, the legs of the U are inserted through a frame and the U-shaped bar is fixed in the frame in that the U-shaped bar is pressed against the frame by means of wedges which are forced inwardly opposite to the inserting direction. Whereas this will permit a change of the passage for the wrapper tip in adaptation to the tip volume by a corresponding variation of the insertion of the U-shaped bar into the frame, this will be possible only at the closing time. Any later change of the volume of the closed tip by thermal processes or processes due to aging will result in a change of the pressure applied to the wrapper tip because in that case the geometry of the passage which has been formed during the closing operation and receives the tip material will not be changed. Besides, the frictional connection between the U-shaped bar and the frame which surrounds the legs of said bar, which frictional connection has been established by the wedging, is not sufficiently resistant to separation.
The invention intends to solve the problems set forth hereinbefore. It resides in that at least one part of the plastic clip consists of an elongate frame, which extends transversely to the longitudinal direction of the tip and is optionally closed on the outside and has side bars, which are relatively high relative to their wall thickness and have centrally disposed aligned recesses, and that the projection is integrally formed at least with the second part, which substantially covers the frame on the side on which the recesses are disposed, and the projection consists of a rib, which is parallel to the side bars and protrudes into the interior of the frame. The interior of the frame constitutes a chamber, into which the tip of the wrapper end is deflected and the volume of which can b

REFERENCES:
patent: 3164250 (1965-01-01), Paxton
patent: 3171184 (1965-03-01), Posse
patent: 4128922 (1978-12-01), Hutchison
patent: 4275485 (1981-06-01), Hutchison
patent: 4405161 (1983-09-01), Young et al.
patent: 4416038 (1983-11-01), Morrone, III
patent: 5189766 (1993-05-01), Weber

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