Abstract: A vacuum cleaner height adjustment mechanism including a cleaning head having a pair of laterally spaced front wheels and a pair of laterally spaced rear wheels mounted for rotation within the cleaning head for supporting the cleaning head on a floor during vacuum cleaning operations, the front wheels being mounted to a common axle mounted in the cleaning head for pivotal movement around a fixed axis, the wheels being mounted to the axle offset from the pivotal axis of the axle, an arm extending from the axle, a shaft mounted substantially horizontally in the cleaning head for rotation about a central axis disposed in a plane perpendicular to a plane containing the axis of the axle, one end of the shaft having spiral threads thereon and an opposite end having an adjustment knob fixed thereto for manually rotating the shaft, and a guide member having internal threads matching and engaged with the spiral threads on the shaft for movement along the shaft, the guide member being coupled to the arm extending from

Abstract: A binary magnitude comparator having a plurality of rows and a plurality of columns, including a most significant column and a least significant column. The binary magnitude comparator is not clocked and performs a comparison asynchronously in a shorter period of time than a clocked binary magnitude comparator of corresponding bit size. The binary magnitude comparator comprises a plurality of comparator cells forming a plurality of rows and columns. Each row corresponds to a register, and each column a bit position in that register. A comparison is begun by selecting one or more registers with a plurality of select signals coupled to comparator cells in the most significant column, and proceeds from the most significant column, to successively next most significant columns, and terminates when the comparison in the least significant column is complete.

Abstract: An integrated circuit is disclosed with a logic network having an output coupled to a sense node and having a virtual ground node, and with a sense amplifier having a sensing circuit coupled to the sense node to provide an output signal, charging and discharging feedback circuits coupled to the sense node that limit the swing of the sense amplifier, and an enable control to enable and disable the sense amplifer. In one embodiment in a CMOS integrated circuit a parallel network of n-channel transistors has an output connected to a sense node of a sense amplifier. A sensing inverter and a feedback inverter are connected to this sense node. The switchpoint of the feedback inverter is substantially higher than the switchpoint of the sensing inverter. A charging n-channel transistor is connected between the sense node and a power supply for charging the sense node, and the output of the feedback inverter is connected to the gate of the charging transistor.