Chain – staple – and horseshoe making – Chains – Links
Reexamination Certificate
1999-08-17
2001-04-17
Jones, David (Department: 3725)
Chain, staple, and horseshoe making
Chains
Links
C059S084000
Reexamination Certificate
active
06216434
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a chain lock for link chains, having two essentially U-shaped lock parts which are releasably connected to one another and each have an inner limb and an outer limb which is connected to the latter via a yoke, the mutually facing sides of the inner and outer limbs being connected to one another in each case by three pairs of holding teeth in the closed position of the lock and a supporting and locking element for the lock parts being arranged between the mutually facing sides of the inner limbs in the region of the holding teeth of the central pairs of holding teeth which are designed to be stronger than the rest of the holding teeth.
A chain lock of the above type is known from DE 32 07 629 C2 with regard to its basic construction. The known chain lock is distinguished by a favourable distribution of the forces to be transmitted over the different pairs of holding teeth. Regardless of its advantageous design, the strength values which can be achieved with the known lock are still appreciably lower than the strength values exhibited by the links of the chain strands to be connected. Various approaches have been tried in the attempt to approximate the strength values of the lock to the strength values of chain links of the same quality category. One of the improvement possibilities is known from DE 43 33 261 C1; it consists in plastically deforming the region of the transition between the tooth flanks and the tooth interstices of the lock parts with the aid of a pressing or percussion tool in order, in this way, largely to compensate critical tensile direct stresses, occurring from the outset in the region mentioned, by means of compression stresses for the purpose of increasing dynamic strength.
SUMMARY OF THE INVENTION
The invention is based on the object of further increasing the strength of the generic chain lock by suitable measures in the sense of optimization in order to adapt the service lives of the lock and the chains to one another to an even greater extent than previously and thus, in particular, to meet the demands of mining for a reduction in the frequency of exchanging chain locks in drive chains subject to high loads under difficult conditions.
The object set is achieved by the fact that the holding teeth of the central pairs of holding teeth and the holding teeth of the pairs of holding teeth arranged in the region of the ends of the inner limbs have a greater height than the holding teeth of the pairs of holding teeth arranged in the region of the ends of the outer limbs, and that, between the flanks of the respective holding teeth of each pair of holding teeth engaged with one another, cavities are provided on both sides of a central supporting zone which extends at a maximum over a third of the height of the holding teeth and serves to transmit tensile forces.
It is achieved by the height ratios proposed that wear of the outer limbs of the lock results less rapidly than previously in weakening of the lock strength. The design of the contact conditions between the flanks of the holding teeth brings about a more favourable stress distribution within the lock, particularly in the case of heavy loads.
REFERENCES:
patent: 2819586 (1958-01-01), St. Pierre
patent: 4505103 (1985-03-01), Dalferth et al.
patent: 3207629 (1983-09-01), None
patent: 3710047 (1988-10-01), None
patent: 3916-284 (1990-11-01), None
patent: 4333261 (1994-10-01), None
Bauer Hans
Dalferth Hans
Jones David
RUD-Kettenfabrik Rieger & Dietz GmbH u. Co.
Stone Mark P.
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