Specification for machine screw nuts, pressed type (B.A. and Whitworth form threads)

1957 ◽  
Keyword(s):  
Machine Screw

Mechanics of tunnelling machine screw conveyors: model tests

Géotechnique ◽  
2006 ◽  
Vol 56 (9) ◽  
pp. 605-615 ◽  
Author(s):  
A. S. Merritt ◽  
R. J. Mair
Keyword(s):  
Model Tests ◽  
Machine Screw ◽  
Tunnelling Machine

Standard Infant Crib Testing Enhanced With Live Children Shaking

2002 ◽  
Author(s):  
Dennis B. Brickman
Keyword(s):  
Standard Test ◽  
Test Results ◽  
Safety Standards ◽  
Machine Screw ◽  
Shake Test ◽  
Test Requirements ◽  
Push And Pull

An infant asphyxiated when a machine screw detached from a crib, the headboard separated from the crib rod, and the infant’s head stuck in the opening. The evaluation of infant cribs by inanimate standard test protocols is enhanced by live child crib shake testing. This live testing provides data for quantifying the horizontal push and pull forces that children actually apply to the sides of a crib. Comparisons are made between the live child shake test results and the inanimate test requirements contained in crib safety standards. Although the inanimate standard test protocols are inconsistent, the machine screw did not fail from normal use because the inanimate test requirements far exceed the maximum live results.

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