Abstract: A box-shaped protective cover that covers an upper structural portion of a body of a vibrating compactor is manufactured by executing a cutting process for fashioning a single metal plate into a shape including a first planar portion, a second planar portion, an intermediate portion, and a plurality of side flaps, a bending process for bending or curving the side flaps and the intermediate portion, and a welding process for welding a side flap of the first planar portion to a side flap of the second planar portion.

Abstract: The present invention provides a method of manufacturing a sufficiently strong, box-shaped protective cover for a vibrating compactor inexpensively using a small number of processes and only simple processes, and provides a protective cover for a vibrating compactor. A box-shaped protective cover that covers an upper structural portion of a body of a vibrating compactor is manufactured by executing a cutting process for fashioning a single metal plate into a shape including a first planar portion 1, a second planar portion 2, an intermediate portion 3, and a plurality of side flaps 5 (5a to 5d), a bending process for bending or curving the side flaps 5 and the intermediate portion 3, and a welding process for welding a side flap 5a (or 5b) of the first planar portion 1 to a side flap 5c (or 5d) of the second planar portion 2.

Abstract: An apparatus for accurately measuring the freeness of paper stock in a short time is disclosed.The apparatus comprises a pump and plunger which take a sample of stock from a flowline or a place in which paper stock is prepared and places the sample in an agitation tank. A water supply dilutes the sample in the agitation tank to a predetermined consistency and a first pressurized air supply agitates the diluted sample so that fibrous material in the stock is evenly dispersed in the water. The agitation tank is closed to the atmosphere and a second pressurized air supply provides a pressure in the tank for draining the liquid from the sample through a screen. The liquid which passes through the screen is delivered to a measuring cylinder.