Abstract: A multifunctional desk includes a top plate, a leg portion that supports the top plate in air, a rotating shaft provided below and parallel to the top plate, a rotating plate provided below the top plate, a first fixture, a second fixture, and a slide plate provided below the top plate and above the rotating plate. The first fixture fixes the rotating plate to the top plate or releases the rotating plate from being fixed to the top plate in a state of protruding in front of the top plat. The second fixture fixes the rotating plate to the top plate or releases the rotating plate from being fixed to the top plate in a state of being retreated below the top plate. The slide plate protrudes in front of the top plate or is retreated below the top plate by sliding in parallel to the top plate.

Abstract: A multifunctional desk includes a top plate, a leg portion that supports the top plate in air, a rotating shaft provided below and parallel to the top plate, a rotating plate provided below the top plate, a first fixture, a second fixture, and a slide plate provided below the top plate and above the rotating plate. The first fixture fixes the rotating plate to the top plate or releases the rotating plate from being fixed to the top plate in a state of protruding in front of the top plat. The second fixture fixes the rotating plate to the top plate or releases the rotating plate from being fixed to the top plate in a state of being retreated below the top plate. The slide plate protrudes in front of the top plate or is retreated below the top plate by sliding in parallel to the top plate.

Abstract: A wheel speed detection system including a rotator, a sensor head, a detector, a pulse converter, a speed calculator and a threshold shifter. Plural concave and convex portions are formed on a periphery of the rotator rotating together with a wheel. The sensor head includes a coil to generate an alternate current magnetic field. The detector excites the coil to generate an eddy current on the concave and convex portions, and outputs alternate current detection signals corresponding to changes in the eddy current generated with rotation of the rotator. The pulse converter converts the alternate current detection signals into pulse signals according to preset threshold levels. The speed calculator calculates rotational speed of the wheel based on the pulse signals. The threshold shifter shifts the threshold levels corresponding to a difference between a default average and an average of the alternate current detection signals actually outputted from the detector.

Abstract: A wheel speed detection system including a rotator, a sensor head, a detector, a pulse converter, a speed calculator and a threshold shifter. Plural concave and convex portions are formed on a periphery of the rotator rotating together with a wheel. The sensor head includes a coil to generate an alternate current magnetic field. The detector excites the coil to generate an eddy current on the concave and convex portions, and outputs alternate current detection signals corresponding to changes in the eddy current generated with rotation of the rotator. The pulse converter converts the alternate current detection signals into pulse signals according to preset threshold levels. The speed calculator calculates rotational speed of the wheel based on the pulse signals. The threshold shifter shifts the threshold levels corresponding to a difference between a default average and an average of the alternate current detection signals actually outputted from the detector.

Abstract: A wheel speed detection system including a rotator, a sensor head, a detector, a pulse converter, a speed calculator and a threshold shifter. Plural concave and convex portions are formed on a periphery of the rotator rotating together with a wheel. The sensor head includes a coil to generate an alternate current magnetic field. The detector excites the coil to generate an eddy current on the concave and convex portions, and outputs alternate current detection signals corresponding to changes in the eddy current generated with rotation of the rotator. The pulse converter converts the alternate current detection signals into pulse signals according to preset threshold levels. The speed calculator calculates rotational speed of the wheel based on the pulse signals. The threshold shifter sifts the threshold levels corresponding to a difference between a default average and an average of the alternate current detection signals actually outputted from the detector.

Abstract: In a wheel speed detection system wherein an eddy current displacement sensor is used, even when a distance between the eddy current displacement sensor and a convex portion of a rotator changes due to a change in load on a wheel, an error in a wheel assembly during a maintenance or other reasons, wheel speed can be detected accurately. Sensor detection voltage corresponding to an impedance change of a detection coil (11) generated in association with wheel rotation is inputted into a signal processing device (20). In a signal level determination unit (22), threshold voltages (VTH and VTL) are calculated based on sensor detection voltage after A/D conversion. Specifically, the difference between the average of sensor detection voltage, when the facing distance between a sensor head (10a) and a convex portion (7a) is a preset default facing distance (d0), and the average of actual sensor detection voltage is obtained, and preset threshold voltages are shifted for the difference.