There is no record of a Phrag Yosemite Sam; however I did a search and found a few references to a Phrag. Grande 'Yosemite Sam'.
link to photo
It's not always the case, but a big & healthy Grande that won't bloom is most often due to insufficient light. Or maybe it's getting enough light for any self-respecting phrag but wants to be irritating to the orchid grower and demand more. If the leaves are medium to dark green, I'd bump up the light levels gradually. If they're already a very light green, then it's probably not light...(and get back to us).