Abstract: Methods are provided for calibrating a tachometer or generator device to reduce residual errors associated with the tachometer-generator device. A shim structure is positioned within the air gap of the tachometer-generator device. A physical characteristic or location of placement of the shim structure is selected to reduce variation in an output voltage of the tachometer-generator device.

Abstract: Methods are provided for calibrating a tachometer or generator device to reduce residual errors associated with the tachometer-generator device. A shim structure is positioned within the air gap of the tachometer-generator device. A physical characteristic or location of placement of the shim structure is selected to reduce variation in an output voltage of the tachometer-generator device.

Abstract: A rotational position sensing system includes a rotor, one or more magnets, a stators and at least two magnetic field sensors. The stator has an inner surface and surrounds at least a portion of an outer surface of the rotor. The stator inner surface is spaced-apart from the rotor outer surface to form a gap therebetween. The magnets are coupled to, and circumscribe at least a section of, either the rotor outer surface or the stator inner surface. The magnetic field sensors are disposed at least partially in the gap and are positioned at a predetermined angle relative to one another. The sensors detect variations in magnetic field flux as the rotor and stator rotate relative to one another and supply signals that are processed to determine the rotational position of the rotor relative to the stator.

Abstract: An air spring assembly has a pair of spaced end plates and a flexible sleeve extending therebetween forming an internal fluid chamber. One of the end plates is a bead plate which is crimped to an open end of the sleeve. An insert having an internally threaded hole is mounted in a central hole formed in the bead plate. An externally threaded coupler having a hollow bore is mounted in a central opening formed in an end member of an auxiliary reservoir and is threadably engaged with the internally threaded hole to mount the auxiliary reservoir in an abutting relationship on the air spring bead plate to provide a variable rate air spring. A fluid path is provided through the threaded connection for the flow of fluid between the air spring and auxiliary reservoir.

Abstract: An air spring assembly has a pair of spaced end plates and a flexible sleeve extending therebetween forming an internal fluid chamber. One of the end plates is a bead plate which is crimped to an open end of the sleeve. An insert having an internally threaded hole is mounted in a central hole formed in the bead plate. An externally threaded coupler having a hollow bore is mounted in a central opening formed in an end member of an auxiliary reservoir and is threadably engaged with the internally threaded hole to mount the auxiliary reservoir in an abutting relationship on the air spring bead plate to provide a variable rate air spring. A fluid path is provided through the threaded connection for the flow of fluid between the air spring and auxiliary reservoir.

Abstract: A magnetic shield has a multiple-layered lid and a multiple-layered base, wherein each layer of the lid is aligned with the corresponding layer of the base. The magnetic shield also includes an alignment mechanism to maintain the alignment of the corresponding layers of the lid and the base of the shield.

Abstract: A magnetic shield has a multiple-layered lid and a multiple-layered base, wherein each layer of the lid is aligned with the corresponding layer of the base. The magnetic shield also includes an alignment mechanism to maintain the alignment of the corresponding layers of the lid and the base of the shield.

Abstract: A container holder device used in combination with attachment to an upright handle of a mobile floor maintenance apparatus used by cleaning personnel is adapted to hold and support household maintenance fluids. The container holding devices comprises a molded body structure secured to the upright handle and supporting an outwardly extending extruded support structure particularly formed to support a container of cleaning material. Impinging members on the molded body structure in conjunction with the formed extruded support means securely maintains the fluids container within the container holding device while the floor maintenance apparatus is in use.

Abstract: An optical element driving mechanism is disclosed wherein an electromagnetic motor positions an optical element such that a laser beam passing through the optical element is focused onto an optical disk media. The optical element can be translated in two axes by energizing coils suspended within stationary magnetic fields produced by permanent magnets. The magnitude and direction of displacement is controlled by the current passing through the coils. A two axis electro-optical position sensing apparatus for determining the position of the optical element is embedded within the driving mechanism. The position sensing apparatus detects the relative position of the optical element in two axes by imaging a light emitting diode onto a four element photodetector.