JNIOSH

Abstract of RIIS Report ( SH-1955-1 )

National Institute of Occupational Safety and Health, Japan

Some Experiments of Hand-Trucks (Successive Report) --About Strength of Hand-Trucks--

SH-1955-1-2
E.Akiyama, T.Kondo, T.Hakamazuka

: We reported previously the results obtained in the experiment of movement of hand-trucks. Then we measured stresses in the frame of a truck when loaded. We found that the magnitude of stress is large and dangerous in most trucks. Also we knew the states of varying stress in various conditions. These results are useful for designers and users of hand-trucks.

Studies on the Electrification-Phenomena of Flowing Flour in Spout

SH-1955-1-3
S.KOUZUKI, M.TERAZAWA and K.SAKANUSHI

: Dust explosion is often occured by spark-discharge of static electricity which is induced in the flow of flour : So we have researched fundamental cause of electrification of it. Electro static charge induced on flour and spout must be measured and discussed as follows.
  1. Relation between electro static charge on flour and spout.
  2. Variation of electro static charge by kinds of flour.
  3. Variation of electro static charge of flour by electrical effect of earth contact and inserting grid on spout.
  4. Electrical effect by kinds of material, shape and inclination of spout.

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