Abstract: A wheel balance measuring apparatus includes a frame, a hollow rim support shaft rotatably supported by the frame through a bearing, a lower rim mounted on the hollow rim support shaft, and an upper rim positioning above and confronting with the lower rim, so as to be shiftable along and rotatable about the vertical axis. A tested wheel is sandwiched between these upper and lower rims and is rotated together with the hollow rim support shaft for measuring dynamic balance of the tested wheel. The apparatus comprises a coupling shaft having an upper end connected integrally with the upper rim and a lower end formed with a plurality of engaging projections arrayed along an axial direction. This coupling shaft is inserted into or pulled out from the hollow rim support shaft. Claws are disposed inside the rim support shaft for selectively engaging with and disengaging from the engaging projections. A shift device shifts the claws between an engaging position and a disengaging position.

Abstract: The invention provides a key-board switch unit used, for example, in pocketable electronic calculators comprising a base plate having at least one pair of switch electrodes and a covering pad made of an insulating rubber and provided with at least one contact member made of an electroconductive rubber and bonded on the lower surface thereof to face the electrodes coming into contact therewith when the pad is depressed. The contact member is embedded in the covering pad in such a manner that the surface of it is coplanar with the surface of the covering pad at least along the peripheries in conjunction with the covering pad and the contact member is sufficiently small so as to be confined within the area of the covering pad facing the void space formed between the base plate and the covering pad at the portion of the electrodes.

Abstract: In a cassette tape recorder having a loading space for accommodating a cassette loaded thereinto and having a capstan adapted to enter relatively into a capstan receiving opening in the cassette and to drive a tape within the cassette, a cassette loading device comprises a cassette holder for receiving and holding the cassette inserted thereinto, and a cassette holder supporting member rotatably supporting said cassette holder by means of a first pivot shaft. The cassette holder supporting member is rotatably supported by a second pivot shaft. The second pivot shaft is disposed in a fixed position such that the distance between the second pivot shaft and said capstan is relatively small.