The LORD series of Shipping Container Mounts are for fragile, valuable products needing predictable, low to medium level protection. Bonded elastomeric sandwich mounts are simple, versatile, economical and easy to install.

These Shipping Container Mounts consist of two metal plates with an elastomer bonded between them. The composition and configuration of the elastomer determines the static and dynamic properties of the part. Sandwich mounts have excellent capacity for energy control, and they exhibit linear shear load deflection characteristics through a significant deflection range.

Sandwich mounts provide excellent protection from damage due to handling and shipment. The mounts are installed between the container and the fragile unit being shipped. Shock forces from rough handling are absorbed by the mounts deflecting in the shear direction.

Design Considerations

Protecting the equipment from shock forces is the primary function of the mounting system. Controlling vibratory forces is also a factor. The combination of design parameters pertaining to drop height and fragility factor are the basis for calculating the mounting spring rate and therefore system natural frequency. Transportation vehicles produce disturbing vibration in the 2 to 7 Hz frequency range. If the shock requirements will permit, the natural frequency of the suspension system should be above 7 Hz. For lower natural frequencies, consult the LORD engineers.

Required Information

-Weight, W, of unit to be shipped

-Shock input in terms of height of drop, h, or the magnitude, g's, and duration, t, of the applied forces.

-Fragility factor, g, which is the maximum allowable shock force on the equipment.

Use of the Design Guide Curves

To determine the required natural frequency of the system:

Locate the drop height on the abscissa, Fig. 1. Find the specific fragility factor (acceleration in g's) on the ordinate and find the natural frequency at the point of intersection.

To determine the dynamic mounting deflection:

Locate the drop height on the abscissa, Fig. 2. Follow the vertical line to its intersection with the natural frequency, then read deflection on the ordinate.