Excavator tooth retention apparatus
View Patent ↗A tooth adapter defining top and bottom walls and side walls, an adapter recess in one side, a retention means in the adapter recess, a bolt with a fastening inserted in the recess, a collar formed on the bolt of predetermined diameter, a tooth having side walls and defining a hollow chamber fitting over the adaptor, a through tooth bolt opening formed in a tooth side wall of predetermined diameter, the tooth bolt opening being located to register with the adaptor recess, when the tooth is positioned on the adapter. In one version the diameter of the collar is slightly greater than the diameter of the tooth bolt opening, to create a locking effect.
1. An excavator tooth retention device for securing excavator teeth in position preventing inadvertent displacement and comprising;
a tooth adapter body;
a tooth adapter recess formed in said adapter body, and a female thread formed in said adapter body in the recess;
a bolt defining inner and outer ends;
a male thread formed on said inner end of said bolt adapted to be inserted in the tooth adapter recess and engage said female thread in said recess;
a bolt head formed on said outer end of said bolt and defining a security portion of a predetermined diameter;
a collar formed on the bolt of predetermined diameter greater than said bolt head security portion diameter,
a counterbore in said inner end of said bolt;
a spring defining inner and outer ends, wherein said spring inner end contacts said adapter body within said adapter recess, said spring extending into said counterbore, of said bolt;
a tooth having a hollow chamber defined by tooth walls fitting over said tooth adapter;
at least one tooth bolt through opening formed in a said tooth wall of predetermined diameter, said tooth bolt opening being located to register with said adapter recess, when the tooth is positioned on the tooth adapter, and defining an open outer end to allow access of a tool; wherein said adapter recess has a predetermined internal diameter equal to said collar diameter, and wherein said tooth bolt opening in said tooth wall has a predetermined internal diameter less than said adapter recess diameter.
2. The excavator tooth retention device as claimed in claim 1 including a sealing ring fitted around said bolt in said adapter recess.
3. The excavator tooth retention device as claimed in claim 2 including a tool key formed on said bolt head for receiving a tool for rotating the bolt.
4. The excavator tooth retention device as claimed in claim 1 wherein there are two said tooth walls located on opposite sides of said tooth hollow chamber, and including tooth bolt openings extending through both said tooth walls, and defining open outer ends on both sides of said tooth.
5. The excavator tooth retention device as claimed in claim 1 wherein the bolt head security portion has a length less than the length of the bolt collar.