Chain – staple – and horseshoe making – Chains – Links
Reexamination Certificate
2000-03-15
2001-04-17
Jones, David (Department: 3725)
Chain, staple, and horseshoe making
Chains
Links
C059S086000
Reexamination Certificate
active
06216435
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a connecting chain link having two connecting-link parts which are locked in place in the closed position by means of a bolt-shaped locking element, which is guided in an at least partially cylindrical holder formed by the connecting-link parts, and is secured against axial displacements by at least one locking member which is arranged in its central region and can be pressed into a slot in the holder.
A connecting chain link of the abovementioned type is disclosed in DE 43 33 261 C1. In this connecting chain link, in order to secure the axial position of the locking element use is made of two spring lock washers which are pressed, with the insertion of balls, into a slot in the holder by means of a clamping sleeve which can be driven into a central hole in the locking element. As experience has shown, the locking element of the known connecting link has a tendency to tilt in its holder, the size of the tilting movements depending on the manufacturing tolerances and on the particular operating conditions. Although these tilting movements are small, particularly with the connecting link being novel, they encourage wear of the locking element and this may have a negative effect on the service life of the connecting chain link.
SUMMARY OF THE INVENTION
The invention is based on the object of providing a connecting chain link of the type under consideration, in which tilting movements of the locking element about a transverse axis running perpendicularly to its longitudinal axis are eliminated. According to the invention, this object is achieved by the locking element having in the vicinity of its two ends a respective groove which is provided, in the region of its bottom, with a pad which consists of an elastic material and against which the inside of a spring lock washer, which is arranged in the respective groove, is supported, the spring lock washer bearing in the locked state with its outside against that surface of the holder which faces it.
The connecting chain link according to the invention provides the advantage that any wobbling of the locking element is prevented with it, by means of the spring lock washers which are arranged at the location favourable for supporting a tilting movement, even if the manufacturing tolerances maintained during the production of the connecting link are comparatively large. The elastic material forms a type of resilient bridge between the spring lock washers and the bottom of the grooves holding them.
REFERENCES:
patent: 4505103 (1985-03-01), Dalferth et al.
patent: 4706451 (1987-11-01), Stromberg et al.
patent: 3710047 (1988-10-01), None
patent: 3916284 (1990-11-01), None
patent: 4333261 (1994-10-01), None
Bogdan Zvonimir
Scherle Hans-Jurgen
Jones David
RUD-Kettenfabrik Rieger & Dietz GmbH u. Co.
Stone Mark P.
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