A supersonic transducer including means for detecting its vibrating speed and for changing the frequency of the energizing current in response thereto. This invention utilizes the property that when an electrostrictive vibrator is vibrated resonantly, its dynamic admittance varies depending upon the difference in its stress distribution. The electrostrictive vibrator is divided into portions of large and small stresses to cancel the applied brake currents. Simultaneously, a signal is derived tha...

Acrylonitrile polymer having excellent whiteness and resistance to thermal coloration is prepared by polymerizing acrylonitrile or a mixture of at least 85 percent by weight of acrylonitrile and the balance of an ethylenically unsaturated monomer capable of copolymerizing with acrylonitrile in an aqueous medium containing a catalyst comprising nitrous acid or its salt and a water-soluble sulfoxy reducing compound and at least 10.sup.2 p.p.m. of a chelating agent.

Anti-skid brake control system for vehicles including a hydraulic braking circuit and anti-skid actuator driven by pump powered hydraulic pressure for controlling the braking pressure in response to an electric signal indicating a wheel rotational condition. The actuator includes a cut off valve for ON-OFF controlling of the braking circuit, a hydraulic pressure reducing piston operatively connected to the cut off valve for reducing the hydraulic brake pressure of the circuit, and an electro-mag...

A safety device for vehicles comprises a movable member which normally lies stowed but which, upon collision of the vehicle with a pedestrian, is raised by a motor to form a barrier around an upward-facing surface upon which the pedestrian may land, thus restraining him from falling off again. This surface may be part of the vehicle, e.g. the bonnet. The barrier may contain fracture devices which break if the vehicle collides with a massive object, e.g. another vehicle.

A box-shaped furniture unit having an open front, a top board, right and left side boards, a bottom board, and a back board, all of which are interengaged with each other, the unit being able to be connected to a plurality of other furniture units so as to form various vertical and horizontal arrays.

A battery actuated and motor-driven three-wheeled toy car for a child having a seat at the rear part of the vehicle and being driven by a front wheel associated with a gear reduction mechanism and a motor which is energized or de-energized by operation of a manually maneuverable lever.

A mulching film of synthetic material of substantial length in a running direction having a plurality of short parallel slits or linear apertures formed therein in at least one row extending in the running direction of the film. The film is used to cover fields in which seeds or seedlings are planted.

A molded case circuit breaker comprising a contact arm movable between circuit closed and open positions, a collapsible mechanism including a releasable member having one end normally engaged with a latch member of an automatic trip unit, a pair of toggle links provided between the movable contact arm and the releasable member, and a tension spring stretched between a manually operable handle and a toggle knee of the toggle links, the other end of the releasable member having a wedge member swin...

A mat is provided having a cushion such as a plurality of bristles whose roots are forked. The mat having a cushion is prepared by extruding a melted synthetic resin from a plurality of orifices or a slit in a swinging nozzle onto a surface of a running sheet and adhering the forked roots of the bristles or film on the sheet and cooling it to solidify the same. The extrusion of the melted synthetic resin can be made between two sheets through the swinging nozzle and the bristles laid between the...

An in-process sizing device generates an output signal corresponding to the diameter of a rotating workpiece of non-circular cross-section. A signal generating circuit generates a first and a second signal each time the output signal is respectively increasing and decreasing in the cycle thereof. A peak holding circuit holds the voltage peak of the output signal in response to the first signal. A sample holding circuit picks up a voltage sample corresponding to a major diameter of the rotating w...