A pad for providing alternating pressure e.g. in a mattress. The pad comprises first and second flexible longitudinal tubes adjacent respective first and second sides of the pad. The pad also includes a plurality of first transverse tubes communicating pneumatically with the first longitudinal tube and each having a closed end remote therefrom and a plurality of second transverse tubes communicating pneumatically with the second longitudinal tube and each having a closed end remote therefrom. Th...

A foot massager is built around a cylinder that preferably mounts two axially spaced longitudinally ribbed, bulging sleeves separated by a radially extended central partition disk and captured at their outer ends by roller disks, each having end stops to prevent the massager from rolling too far. The sleeve has alternating short and substantially compressible tall ribs to clutch the skin of a user's foot and thereby enhance the soothing effect. The cylinder mounts a vibrator internally. The user...

An object of the invention is to, in a vehicular alternating current (AC) dynamo, reduce an influence of vibration on a brush during operation, thereby preventing the brush from wobbling, cracking or causing other damages, also to make the brush sufficiently exposed to cooling air during operation, thereby preventing the brush temperature from rising excessively. In the vehicular AC dynamo, by virtue of a pressing force produced upon a tubular cover integral with a fan guide being fixed to a rea...

An alternating drive for wheeled vehicles comprises two opposite pedals which can move on a circular path about a pedal shaft secured on the cycle frame. The alternating drive is characterized in that it is equipped with two cranks (26, 27; 26a, 27a; 26b, 27b) which can be moved within a predetermined oscillating angle range about an auxiliary shaft (25) secured to the frame (10). Between the cranks (26, 27; 26a, 27a; 26b, 27b) and the pedals (21) is a driver connection which transforms the circ...

A rotor for an alternating current generator of the Lundell type. The rotor shaft carries two segments which have interleaved pole teeth. The rotor has a core member and a field coil disposed about the core member. The segments and/or core member are formed of compressed powder iron particles having a particle size in a range of about 10 to 250 microns. In the manufacture of the core and/or segments the iron powder particles are coated with a thermoplastic material and this thermoplastic coated ...

An alternating current generator for a vehicle, in which durability is improved, magnetic fluxes are prevented from leaking, and noises are reduced. In the alternating current generator, a ring made of a steel material is disposed so as to abut against field core claws and on the outer peripheral side of a field winding. Resin permanent magnets which are molded onto the ring are disposed between the field core claws so as to abut against the field core claws, respectively.

A far infrared (FIR) range responsive photodetector. There is a substrate (28) of degenerate germanium. A a plurality of alternating impurity-band (32) and high resistivity (30) layers of germanium are disposed on the substrate (28). The impurity-band layers (32) have a doping concentration therein sufficiently high to include donor bands which can release electrons upon impingement by FIR photons of energy hv greater than an energy gap .epsilon.. The high resistivity layers (30) have a doping c...

An alternating current generator for supplying the electrical loads on a motor vehicle. The generator has a stator core that carries a three-phase stator or output winding. The rotor of the generator has two claw pole members that are so oriented that the fingers of the pole members are aligned. Disposed between the two pole members is a third pole member having projections disposed between the aligned fingers of the claw pole members. The rotor has two field coils which are so arranged and ener...

An alternating current electromagnet with a magnetic core assembly is provided with a unique design for a sideplate. The sideplate has a slot with a lateral opening. In assembling the sideplate onto the side of the magnetic core, the slot receives a shading coil. A portion of the sideplate forming the slot extends across a channel formed in a pole face of the core to lock the shading coil into the channel along the sides of the core. The sideplate is formed in a C-configuration and interconnects...

Apparatus is disclosed for mounting a plurality of doors to the weapons bay of an aircraft such that each door is pivotal about one of two hinge lines. Generally, the apparatus includes a door-operating assembly for displacing each of said plurality of doors. A journal assembly is provided for supporting each said door such that the door is pivotal about either a first or second axis. The journal assembly includes a housing portion which is fixed to an end wall of the weapons bay and a bearing p...