Abstract: In a process of casting a rocker arm as one piece from high chrome cast iron, a Ca-Si base addition agent is added to the molten metal in an amount of 0.3 to 0.6% by weight. The agent is effective as a globulizer to round high-hardness carbide precipitates directing toward the casting surface.

Abstract: There is disclosed a device for driving four wheels of a car at all times. In this device, a differential is provided between the left front wheel shaft and right rear wheel shaft and likewise a differential is also provided between the right front wheel shaft and left rear wheel shaft so that said two differentials can be driven by the same driving source.

Abstract: A high strength high chromium cast iron contains fine particle precipitated hard carbide. The precipitated hard carbide has an average particle size of 20 .mu.m or less and hardness of Hv 500 or more in martensite base matrix, and has area ratio in a range of 30% or more and 45% or less. The precipitated hard carbide has spheroidal ratio (surface area of sphere circumscribing the precipitated hard carbide versus actual surface area of precipitated hard carbide) of 40% or more.

Abstract: A limited slip differential that uses worms and worm wheels, wherein two or more groups of worm wheels are rotated on a planetary carrier without using a spur gear which has heretofore been employed to mesh the worms with each other. An even-numbered of worm wheels are provided, and pinions are respectively connected to the worm wheels in such a manner that the pinions are alternately disposed at either one or the other of the axial ends of each of the worm wheels. The arrangement provides that the worm wheels are alternately in engagement with a pair of internal gears coupled to respective differential rotary shafts through the pinions.

Abstract: A rocker arm for use in an internal combustion engine. The rocker arm has a portion abutting an opponent mechanical component, and at least the portion is formed of a cast iron consisting of from 2.5 to 3.7 wt % of carbon; from 1.0 to 2.0 wt % of silicon; from 0.5 to 1.0 wt % of manganese; from 10 to 20 wt % of chromium; from 0.3 to 0.7 wt % of nickel; not more than 0.3 wt % of phosphorus; not more than 0.1 wt % of sulfur; and balance iron and impurities; Carbide mainly containing chromium is uniformly precipitated from at least one of pearlitic and martensitic matrix in the cast iron.

Abstract: A sliding member for use in an internal combustion engine having an improved wear resistance. The sliding member has a sliding surface composed of a mixture of 50 to 97% by weight of high carbon ferrochromium and 3 to 50% by weight of ferrous alloy applied thereto by spraying. In a preferred embodiment, the ferrous alloy is high carbon iron containing at least 0.6% by weight of carbon.

Abstract: An elongated envelope for a fluorescent light bulb is held at each of its ends, and heated to a degree by which it is bendable. The ends are then moved relatively to each other in a path by which they are turned inwardly in opposition to each other and toward the center portion of the envelope while being directed out of the plane of the center portion to in part overly the center portion.