Abstract: An exercise treadmill is disclosed having a flexible, endless belt entrained around a pair of spaced rollers and having a slider bed disposed under the upper reach of the belt. The slider bed is of a heat-conducting metal plate, and is supported by an open frame such that air may freely flow under the slider bed to carry away heat generated by the upper reach of the belt (with the weight of the runner supported thereon) functionally sliding on the slider bed. The frame, slider bed supports, and slider bed are constructed in such manner as to permit limited vertical flexing movement of these parts when a user runs or walks on the upper reach of the belt supported by the slider bed so as to absorb shock and cushion the impact of the user's feet.

Abstract: A debris-collecting assembly for a sliding door track in which a door is slidably mounted in an elongate lower channel of a door frame for movement between open and closed positions, and a top-open pan is removably located in the channel, the pan being open at one end to receive debris swept along the channel when the door is in its open position, and to receive the door in its closed position. An elongate track is in the channel and slidably engages the door, the track being spaced from a closed channel end to provide a compartment, and the pan is removably located in the channel compartment with the open pan end facing toward the track. In a double door assembly a pair of channels are disposed in side-by-side relation with a door slidably mounted in each channel. A passage between the channels places the channels in communication.