Abstract: A battery case hinged at the bottom is of substantially the same size as a conventional heavy-duty six-volt battery and has positive and negative terminals located at substantially the same spacing of positive and negative terminals of a conventional heavy-duty six-volt battery. The case accommodates four columns of batteries with each column accommodating a D, C and AA battery between pairs of conducting strips connected in series. In each column the C battery is located intermediate the D and AA battery. In adjacent columns, the D battery is adjacent to the AA battery. The negative and positive terminals are connected to the extreme ones of the conducting strips to develop six volts therebetween, each triad of batteries being connected in parallel between a respective pair of conducting strips. Resilient contacts attached to negative ones of the conducting strips engage the negative terminal of a respective battery and urge it toward a positive conducting strip.

Abstract: A luminaire has a spherical or ovoid reflector formed with asymmetrical voids that allow beams from the lightbulb in the reflector to emerge side-by-side through the voids in opposite directions after reflection from opposite internal surfaces of the reflector.

Abstract: A loudspeaker driver has a molded plastic basket made of thermoplastic polyester with 20-30% glass fill and a stamped octagonal front pole plate of low reluctance magnetic material molded into the base of the basket with a keyed central bore. The break edge of the stamped pole plate is used as an undercut for encapsulation. The basket is formed with three tabs spaced equiangularly about the periphery for attachment to the baffle. Accurate upstanding rims extend between the tabs for making engagement with rim segments in a baffle to effect an essentially fluid-tight attachment of the driver to the baffle using snap-in techniques. The tabs are also formed with openings for accommodating screws or other fastening elements to fasten the driver in place with more conventional techniques. Radial ribs extend downward then radially inward from each tab. An exceptionally flat annular surface is just inside the tabs for accommodating the edge of the diaphragm or cone, the roll of which may be either concave or convex.

Abstract: An elastomeric shoesole designed specifically for athletic activities wherein the sole contains at the outer side of the heel and/or the inner side of the ball transversely-extending, longitudinally-spaced openings which extend to approximately the longitudinal center line and wherein the respective opposite sides are substantially solid, thereby allowing the sole to yield at the outer side of the heel end to a greater extent than at the inner side and at the inner side of the ball to a greater extent than at the outer side.