Universal pulsato unit

In musical apparatus cooperable with a speaker:

• (a) a light weight molded rotor, said rotor having a central aperture for passage of a shaft as well as having outwardly opening tapered recessed at the ends of said aperture;
• (b) said rotor having an angled sound channel with a throat at one axial end cooperable with a speaker, and having a substantially radially opening mouth for producing a rotating sound radiation pattern upon rotation of said rotor;
• (c) a first pair of rubber-like tapered grommets carried by the shaft and fitted in said tapered recesses at opposite ends of the rotor in the absence of wedging forces, said grommets being cemented in said tapered recesses;
• (d) means for rotating said rotor independently of said grommets and said shaft whereby said shaft follows the rotary movement of said rotor;
• (e) a pair of cup shaped thrust bearings for the shaft ends;
• and
• (f) a second pair of rubber-like grommets supporting said cup bearings and cooperating with said first pair of grommets to provide noise suppression as well as shock mounting of said rotor.

In a musical accessory apparatus cooperable with a speaker:

• (a) a rotor;
• (b) a panel having an aperture for mounting a speaker on one side of the panel;
• (c) a rotor shaft mounting said rotor for angular movement on the other side of the panel aperture;
• (d) said rotor having an angled sound channel with a throat at one axial end registrable with said speaker and having a substantially radially opening mouth at the other end for producing a rotating sound radiation pattern upon rotation of said rotor;
• (e) a pair of bearing cups for the shaft ends respectively;
• (f) a bracket extending across said aperture and having a mounting hole for receiving one of said bearing cups at the location of the center of said aperture;
• (g) at least three angled rods each having first proximal ends attached to the mounting panel in angularly spaced relationship about said panel aperture to surround the rotor and each having second distal ends substantially converging at a place spaced from said mounting panel to form a cage for said rotor;
• and
• (h) a separate bearing hub carried at the converging distal ends of said angled rods, said hub having a mounting hole receiving the other of said bearing cups.

In a musical accessory apparatus cooperable with a speaker:

• (a) a rotor;
• (b) a panel having an aperture for mounting a speaker on one side of the panel;
• (c) a speaker mounted at said panel aperture, said speaker having a magnet;
• (d) a rotor shaft mounting said rotor for angular movement on the other side of said panel aperture;
• (e) said rotor having an angled sound channel with a throat at one axial end registrable with said speaker and having a radially opening mouth at the other end for producing a rotating sound radiation pattern upon rotation of said rotor;
• (f) bearing means for supporting said shaft for rotation;
• (g) bracket means for said bearing means and mounted on said panel, one of the bracket means extending across said panel aperture and the other of said bracket means projecting from said panel and extending to the outboard end of said rotor shaft;
• (h) a back enclosure for said speaker made of material having the light weight characteristics of molded expanded polystyrene;
• (i) means mounting said back enclosure on the panel to surround said speaker;
• and
• (j) clamping means operative between the magnet and the back of said enclosure for compressing said enclosure to impart thereto characteristics of a heavy vibration resistant material.

In a musical accessory apparatus cooperable with a speaker:

• (a) a rotor having a sound channel;
• (b) a panel having an aperture for mounting a speaker on one side thereof;
• (c) a rotor shaft mounting said rotor for angular movement on the other side of said aperture with said sound channel in registry with said aperture;
• (d) a pulley carried by said shaft and located adjacent said panel opening;
• (e) a coupling between the pulley and said rotor for rotation thereby;
• (f) a drive motor having a pulley shaft;
• (g) a pulley belt between the pulley shaft and said pulley;
• (h) a two part bracket mounting said drive motor or said panel, said drive motor being mounted on one of said parts;
• (i) means adjustably mounting the first of said bracket parts on said panel for movement radially of said rotor axis for adjustment of the tension of said pulley belt;
• (j) the second of said bracket parts being directly attached to said motor;
• (k) one of said bracket parts having a plurality of circular openings;
• (l) a corresponding plurality of centrally apertured biconical mounting grommets made of resilient rubber-like material having acoustic damping characteristics, each mounting grommets having a peripheral groove fitting the edges of companion circular openings whereby said grommets are peripherally suspended;
• (m) a plurality of posts attached to the other of said bracket parts and respectively extending through the mounting;
• and
• (n) a plurality of posts attached to the other of said bracket parts, each of the posts extending through a corresponding grommet to capture the grommet at the opposite apex regions thereof between the proximal and distal ends of the corresponding post whereby the said bracket parts are connected with limited contact area though the apex regions thereof whereby, under normal operating conditions, the acoustic path resistance between the parts is maximized while stand by shock support is provided.