Abstract: This invention provides in a continuously operating device having a mixing section comprising opposite-handed helical threads in each of the two relatively rotatable components which threads vary in cross-sectional area in complementary fashion so as to produce a layer-by-layer material transfer and shear working between the said components, that the said opposite handed helical threads in said mixing section complement one another substantially also in respect to their helix-angles to the extent that if one helix angle is between 0.degree.and 45.degree. the other is between 45.degree. and 90.degree., to bring about, viewed with respect to the shear-plane-area, a subdivision sufficient for the mixing and compounding requirement.

Abstract: A continuous mixer comprising at least one mixing zone formed by a Transfermix geometry in which the number of starts of the helical thread changes for each of the components along the length of said Transfermix zone in the opposite sense to the change of the cross-sectional area of helical grooves on said component, whereby when in operation a medium moves along said Transfermix zone, portions thereof are successively transferred between the grooves of facing helical threads as giver and taker and whereby grooves of larger cross-sectional area are of greater widths than grooves of small cross-sectional area; in a preferred embodiment the mixer has a driven rotor and stationary barrel, the helical threads thereon being of opposite hand and the number of starts facing one another at any cross-section of the Transfermix zone is such as to make a substantially constant product.

Abstract: A pulse-echo ultrasonic transducer probe includes a substantially centrally disposed axial bore running therethrough and a radial slot extending from the bore to the periphery of its housing. A slotted cap dimensioned to rotatably fit over the top of the housing is provided with a hollow semi-circular stem extending into the bore, the slot of the cap being aligned with the longitudinal opening of the stem. The slot of the cap and that of the transducer, when passing a surgical instrument through the bore into an opaque body, are rotatably adjusted so that they are out of registry with one another for supporting the surgical instrument and for maintaining the instrument in the center of an ultrasonic search beam. Subsequently, after the instrument has reached the desired position in the body the slots are brought into registry for providing removal of the transducer probe from around the instrument.

Abstract: Apparatus for positioning battery-operated road vehicles at relay stations where exhausted batteries are replaced with recharged batteries and wherein automatic or semiautomatic equipment is used for removal and/or introduction of batteries has a horizontal platform for the rear wheels and two sockets for the front wheels of a vehicle. The sockets are provided in a slide which is movable to and fro in parallelism with the front axle of the vehicle and is mounted in a carriage which is movable back and forth along the ground in the longitudinal direction of the vehicle. The carriage and the slide are movable by discrete motors to respectively move the vehicle lengthwise and about a vertical axis to an optimum position relative to a dolly or lift for delivery of recharged batteries or removal of exhausted batteries.

Abstract: A horizontally elongated base is provided and an upright standard has its lower end oscillatably supported from one end of the base for angular displacement about a horizontal axis extending transversely of the base with the standard swingable between an upstanding position and a generally horizontally disposed position with the upper free end of the standard swung downwardly toward the other end of the base. The standard is adjustable in length and the upper end portion thereof includes a reverse bend terminating downwardly in a horizontally outwardly projecting terminal end extending outwardly of the aforementioned one end of the base. The free end of the terminal end portion includes an endwise outwardly opening cup-shaped mount in which a tennis ball is seatingly secured.

Abstract: An improvement to a circular toy intended to be scaled which provides a whistling sound. The whistling sound is produced by a plurality of generally Y-shaped passageways having flexible reeds disposed therein and which are exposed to air currents when the toy is scaled.