Chain – staple – and horseshoe making – Chains – Links
Reexamination Certificate
2000-03-15
2001-05-01
Jones, David (Department: 3725)
Chain, staple, and horseshoe making
Chains
Links
C059S084000
Reexamination Certificate
active
06223517
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a connecting chain link for link chains having two connecting-link parts whose ends, which are connected to each other via a respective longitudinal web, are pushed one into the other in the closed position in such a manner that a respective, essentially U-shaped retaining web of one end grips into a respective, essentially U-shaped retaining groove at the other end.
German Utility Model 74 35 053 discloses a connecting chain link of the abovementioned type. In the case of the known connecting chain link, in order to open and close the connecting link, comparatively large displacement paths have to be covered and there is no space for these, particularly if—as is disclosed in DE 298 11 332 U1 in the central region of the longitudinal limbs of the connecting link there are projections which protrude into the interior of the connecting link. In the latter case, in order to make it possible for the connecting link to be opened and closed, the ends of the connecting link are only held together by short, sickle-shaped retaining webs gripping into identically shaped retaining grooves assigned to them. It is obvious that there is a restriction on the transverse forces which can be transmitted by the short projections. In order at least partially to compensate for the loss in strength in the face of transverse forces, in the second known connecting chain link the projections are designed as hooks gripping one into another.
SUMMARY OF THE INVENTION
The invention is based on the object of providing a connecting chain link of the type under consideration, in whose fitting and removal the connecting-link parts have only to be displaced with respect to each other by comparatively short amounts in the direction of the longitudinal axis of the connecting link, without the shortening of the displacement path having to be bought at the price of a serious limitation of the stressability of the ends of the connecting chain link by means of transverse forces, and without additional precautions having to be taken in the region of the projections in order to absorb transverse forces. This object is achieved in the case of a connecting chain link of the generic type by, in the region of its two limbs, the particular retaining web consisting of two sections which are separated from each other by a clearance, by the wall facing the dividing gap of the connecting link and belonging to the particular retaining groove being provided with a respective recess in the region of the groove limbs, and by the size and position of the recesses and of the clearances being matched to one another in such a manner that the connecting-link parts can be separated from each other and joined together again in an intermediate position, in which they are merely partially pushed together, by means of a movement directed perpendicularly to the longitudinal axis of the connecting link.
The connecting chain link according to the invention provides the advantage that comparatively large transverse forces can be transmitted in the region of its ends even if the connecting-link parts have projections in the region of their longitudinal limbs, or if they are used in order to connect sections of chain strands having links of a small pitch.
REFERENCES:
patent: 859082 (1907-07-01), Kenter
patent: 2525724 (1950-10-01), Robbins
patent: 2761275 (1956-09-01), Robbins
patent: 2819586 (1958-01-01), Pierre
patent: 2979886 (1961-04-01), Robbins
patent: 4090357 (1978-05-01), Smith
patent: 4505103 (1985-03-01), Dlaferth et al.
patent: 6021634 (2000-02-01), Brodziak
patent: 7435053 (1976-05-01), None
patent: 298 11 33 U (1998-02-01), None
Bogdan Zvonimir
Scherle Hans-Jurgen
Jones David
RUD-Kettenfabrik Rieger & Dietz GmbH u. Co.
Stone Mark P.
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