(under subclass 153) Apparatus wherein the device to change or regulate the tensile stress in the endless band includes a screw member provided with a tensile stress changing nut.
SEE OR SEARCH CLASS
180, Motor Vehicles,
9.54, for an endless flexible portable track having a track support mounted for vertical movement including a longitudinally extending coil spring; and subclass 190 for a skilike runner member with one surface engaging endless track type propulsion element.
280, Land Vehicles,
28.5, for a wheel substitute; subclass 255 for a coil spring including an adjustment for spring loading.
474, Endless Belt Power Transmission Systems or Components,
135, and 138 for a guide roll spring biased in the belt tensioning direction. [figure] [caption]A, B, C - Journal boxes for track drive shaft; D - Adjusting device (threaded); E - Crawler beam; F - Screw member; G - Tensioning nut; H - Spherical seat; J - Shackle; K - Cross member; L - Sprocket; M - Track drive sprocket
