Isnt there a pretty big contradiction in there or am I reading it wrong?The LA link is fully patented. Therefore it does not infringe on anything that DW has done.
As far as I know, the 4-bar linkage and roller system are both prior art; in other words, they've been around for ages, nobody can really claim to have invented them, nobody can put a patent on them.
K9 says they have a granted patent but also say it all is prior art so cant be patented?