They do have this clause to try and expand the breadth of the claims:

It should be emphasized that the above-described embodiments of the present disclosure are merely possible examples of implementations set forth for a clear understanding of the principles of the disclosure. Many variations and modifications may be made to the above-described embodiment(s) without departing substantially from the spirit and principles of the disclosure. All such modifications and variations are intended to be included herein within the scope of this disclosure and protected by the following claims.

I am not a lawyer so do not know how much weight such clauses have, but it would seem to be trying for a lot more than just the specifically described arrangement.