Abstract: In a pump, a plurality of pump chambers are defined by a plurality of diaphragms. A pivotable member is attached to the diaphragms. A rotator has a fitting hole formed in one face eccentrically from a rotation center of rotator. A shaft member is inserted into the fitting hole to connect the pivotable member and the rotator. An entrance edge of the fitting hole is chamfered.

Abstract: A toy suitable for attaching to infant furniture has an elongated track having ends with connecting members positioned on the ends of the track for connecting to an appropriate portion of the infant furniture, such as the side rails of a crib. A housing is mounted along the track. The housing includes a motor and associated components which drive the housing along the track. A stop member is located on each of the ends of the track. The housing includes a sensing lever which is engaged against the stop members on the respective ends of the track, so as to switch the direction of travel of the housing along the track. The housing also includes a musical device and a gear train driven by the motor for producing a constant output to drive the musical device.

Abstract: A toy capable of teaching certain information to a child includes a housing having an information display system located on the housing. Indicia is located on a portion of the information display system and is divided into units of information which are viewable one at a time from the exterior of the housing. A control mechanism is associated with the information display system. One of the members of the control system is capable of assuming a variety of positions on the housing with each of these positions coordinated with one of the units of information on the information display system. A test system is located in association with the control system and has at least a first and a second test element which are movable on the housing. The test elements interact with the control system such that they are capable of interacting either in a first manner or a second manner, which can be utilized to correlate a first and second answer with regard to the unit of information currently displayed.