Cable tie

Details Cable tie Cable tie

1998-12-31

2001-05-22

Reichard, Dean A. (Department: 2831)

Electricity: conductors and insulators

Overhead

Ground clamps and cable clips

C174S060000, C174S13800J

Reexamination Certificate

active

06235987

ABSTRACT:

The invention relates to a cable tie in the form of a flat plastic strip provided at one end with a shaped head with an opening for passing the free end of the flat strip through and for locking in the head the flat strip part pushed through the head opening.
A cable tie of this kind is known from U.S. Pat. No. 3,186,047. In this known cable tie, the flat strip and head are made in one piece from plastic, the flat strip is conically tapered at its free end for easier introduction into the correspondingly shaped opening end of the flat head, and a metal plate with plastic partially injected around it is inserted into the head into the corresponding wall of the opening in the head and oriented in a diagonal position such that when the free end of the flat strip is passed through the head opening it abuts the corresponding flat side of the flat strip and forms an acute angle with the insertion direction of the flat strip. As a result, the free end of the flat strip can be inserted but the end of the flat strip is prevented from being pulled back through the head opening, resulting in a loosening of the cable tie, by the metal plate which cooperates in the manner of a barb with the respective side of the flat strip. It makes no difference if the side of the flat strip in question if profiled because the metal plate cooperates in a suitably restricting fashion by its sharp edge with a smooth plastic surface.
The goal of the invention is to provide an improved cable tie, based on this prior art, which is distinguished by the same or better retention reliability by improved handling ability.
This goal is achieved according to the invention by virtue of the fact that, in contrast to the state of the art described above, instead of the metal plate cooperating with a flat side of the flat strip, two metal plates are inserted opposite one another into the head of the cable tie, and cooperate with both edge surfaces of the flat strip.
In an embodiment especially provided for cable ties with small dimensions, the two opposite metal plates are replaced by two opposite edges of a Vcut in a single metal plate.
In the cable tie according to the invention, the total extent of the linear contact between the two metal plates and the opposite edge surfaces of the flat strip amounts to only a fraction of the linear contact between the single metal plate and the flat side of the flat strip of the known cable tie, but nevertheless the retention reliability is equally good or even better because the two opposite metal plates, because of their bilateral arrangement, cooperate more intensively with the edge surfaces of the flat strip, embed themselves correspondingly easily in the edge surface because of the very short contact length, and as a result form very effective barbs that very reliably prevent a loosening of the tightened cable tie.
On the other hand, the cable tie according to the invention has the advantage over the known cable tie that the insertion resistance or the pullthrough resistance of the free end of the flat strip through the head opening is much less with the metal plate located therein than in the known cable tie, which comes from the much shorter total linear contact between the metal plates and the edge surfaces on the flat strip that cooperate with them. The resultant reduction, for example halving, of the insertion and pull-through resistance of the cable tie according to the invention relative to the known cable tie may appear unimportant in the case of a single cable tie, but constitutes a considerable advantage when the situation of an assembly workforce is considered which must install many hundreds of such cable ties each workday.


REFERENCES:
patent: 3186047 (1965-06-01), Schwester et al.
patent: 3397430 (1968-08-01), Pearl
patent: 3562870 (1971-02-01), Sund
patent: 3588961 (1971-06-01), Farago
patent: 3739429 (1973-06-01), Kohke
patent: 5836053 (1998-11-01), Davignon et al.
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patent: 25 34 778 A1 (1976-02-01), None
patent: 0 469 908 A1 (1992-02-01), None
patent: 1035143 (1966-07-01), None
patent: 1 316 862 (1973-05-01), None

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