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Reward Candy Dispenser for Personal Computers
A personal computer peripheral, battery powered reward candy dispenser which immediately presents students with a single candy for each problem completed correctly.
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| Number | Title | Issue Date |
| 6712313 | Constant velocity drive rotary-wing aircraft rotor with torque splitting differential A constant velocity drive mechanism of a rotary-wing aircraft rotor, comprises a torque splitting differential mechanism, comprising a driving disc integral in rotation with a rotor mast and connected to each of two driven discs either side of the driving disc, by a... | 03/30/2004 |
| 5478203 | Blade pitch change mechanism A pitch change mechanism for a plurality of fan blades (12) comprises adjustment device (60) to rotate the blades (12) about their longitudinal axes. A gear box (34) provides rotary power to drive the adjustment device (60) in response to a control signal... | 12/26/1995 |
| 5452988 | Blade pitch change mechanism A lightweight and compact apparatus is provided for altering and controlling the pitch of a plurality of rotating blades during rotation using a mechanical clutch and gear arrangement driven by a rotational speed differential between the blade drive shaft... | 09/26/1995 |
| 5183387 | Fault-tolerant apparatus for controlling blade pitch Fault-tolerant apparatus for controlling first and second input members of a mechanical actuator includes first and second electrical machines and at least two controllers. The first and second electrical machines, which apply braking forces to the first ... | 02/02/1993 |
| 4878809 | Power source and control mechanism for propeller pitch control A pitch controller (10) for controlling the pitch of a plurality of blades (11) of a fan powered by a turbine propulsion engine, with a pitch adjusting device (16) having an input (18) for controlling the pitch of the blades. An input drive shaft (15) pro... | 11/07/1989 |
| 4578019 | Ram air turbine Apparatus and methods for adjusting the pitch of a fluid reactive blade member carried upon a rotor in response to a speed difference between the rotor and a reference speed shaft.... | 03/25/1986 |
| 4565340 | Guided projectile flight control fin system A guidance system for small spinning projectiles which is mechanically simple, has low power requirements, uses relatively unsophisticated electronics, and is capable of withstanding large gas pressures and accelerations. The system uses a one-piece fin a... | 01/21/1986 |
| 4219308 | Torque control system for wind energy conversion devices Automatic torque control of wind energy conversion devices is provided through the utilization of turbine reaction torque. In the preferred embodiment, the frame of the driven machine is arranged to be rotatable through a limited angle. As rated torque of... | 08/26/1980 |
| 4047836 | Phase change means for a power driven device, such as a fan This application discloses means for driving a device, such as a cooling fan of a vehicle motor, together with means for changing the phase relationship of an element moving with the driven device whereby to change the effect of the driven device; in a sp... | 09/13/1977 |
