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Table 5: Earthquake resistance assessments
Whole width of the surface of projection that falls easily
Short distance from the fulcrum on the surface of projection that falls
easily to the position of the center of gravity
Distance from the rear panel to the position of the center of gravity
Height from the floor to the center of gravity
Weight of equipment
Horizontal moment (adjuster bolt) Fp = 0.94 × Wp
There is overturning moment R when 0.94*h> 0.85*L2.
Overturning moment
R = (Wp* (0.94h - 0.85L2))/(2 * L1)
Shear stress of anchor bolt (M8 × 2)
Tensile stress of anchor bolt (M8 × 2)
Interval between adjuster bolts
Interval between earthquake-resistant brackets
Tipping angle
Interval between earthquake-resistant brackets
Tipping angle
Unit
L1
mm
L2
mm
L3
mm
h
mm
Wp
kg
Fp/4
kg
R
kg
τ
N
Fp<τ
σ
N
R<σ
J1
mm
J3
mm
α1
deg
J2
mm
α2
deg
α＞15deg
22
ULVAC. Inc. Components Div.
Date: May 2021
MS120
331
156
318
197
142
33.4
OK
12.0
2038
OK
3531
OK
220
312
29.2
332
40.1
OK
YO20-0938-DI-001-00
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