Pivoted wheel assembly for elevator

Claim 1

A material conveying apparatus comprising: elongated material conveying means, a transverse support having end portions located on opposite sides of the conveying means, means connecting the support with the conveying means, a wheel assembly mounted on each end portion, each wheel assembly having an upright wheel, a mount rotatably supporting the wheel, first generally upright pivot means connecting the mount on the adjacent end portion for movement about an upright axis, lock means for securing the mount to the end portion to selectively hold the wheel in a number of positions relative to the support whereby the material conveying apparatus can be moved in a selected direction, said mount comprising a channellike yoke having a generally upright base and upper and lower generally horizontal members secured to said base, a generally horizontal axle secured to the base and extended in a direction opposite the generally horizontal members, said wheel being rotatably supported on said axle, said horizontal members located and extended adjacent upper and lower sides of an end portion of the support, an elongated rigid tow bar, and upright pivot means connecting one end portion of the tow bar to a horizontal member, whereby the tow bar is an elongated arm to prevent tipping of the material conveying apparatus.