In-line pneumatic-tired roller skate with scrapers

Claim 1

A roller skate including a boot and up to three in-line pneumatic tires comprising; a U-shaped frame having a first and a second leg, said first leg having up to three throughbores disposed therein, said second leg having throughbores similarly configured and in registration with each said throughbore in said first leg, said frame fixed relative to the boot; an axle for each pneumatic tire dimensioned and configured to be received in both said throughbores in said first and second legs of said frame; a pair of spacers having axial throughbores, said spacers disposed on each said axle and positioned between said first and said second legs of said frame; a pair of bearings each having an inner and an outer race, each said inner race fixed relative to each said axle and positioned between each said spacer, each said spacer contacting one of said bearings; a hub having a first and a second face, an axial bore positioned between said first and second faces, said hub disposed on each said axle and positioned between said bearings, said bore maintaining clearance with said axle; said hub having a pair of counterbores in registration with said throughbore disposed in said first and second faces, each said counterbore receiving an outer race of each said bearing; said hub including a pair of radial flanges, each said flange including a lip disposed at a distal end of each said flange; one of said flanges of said hub further including a valve for selectively admitting air and providing means for inflating and retaining air within a volume defined by said hub and each said pneumatic tire; each said pneumatic tire including a tread and a pair of lips which sealingly engage said flange lips of said hub; a scraper for each said pneumatic tire, each said scraper positioned between said first and second legs of said frame and rearward of each said pneumatic tire, each said scraper smooth arcuate face, said face being dimensioned and configured to complementarily receive said tread of said pneumatic tire, whereby said scraper discourages rocks and debris from binding each said pneumatic tire; said first leg of said frame having a slot disposed rearward of each said throughbore disposed therein, said second leg having a similarly configured slot in registration with each said slot in said first leg; each said scraper having a first end and a second end; said first end of each said scraper being received in each said slot in said first leg of said frame, said second end of each said scraper being received in each said slot in registration in said second leg of said frame, each first and second scraper end extending through each said slot in registration in said first and second leg of said frame; and a spring positioned between each first and second scraper ends and said frame and located on an exterior of said frame, each spring biasing each said scraper toward each said tire.