Shock & Vibration Isolators

John Evans’ helical vibration isolators provide the ultimate in shock and vibration protection.

 

Why is shock and vibration protection so important?

Shock and vibration influence the performance and life expectancy of nearly every kind of mechanical and electrical device, large or small.

What added benefits do isolators provide?

Typically, protection from shock and absorption of vibration is accomplished through the combination of a resilient element (metal mesh, an elastomer, a steel spring, etc.) and a metallic supporting frame. However, the helical isolator, also known as a helical mount or a cable mount, provides a higher level of isolation from shock and vibration than any other type of isolation device. Helical mounts provide a coulomb damping of 15-17% of critical (C/Cc).

What makes John Evans’ isolators so effective?

• Our helical vibration isolators (also referred to as spring vibration isolators) are made of aircraft quality stainless steel cable, wound into metal retaining bars prepared for surface mounting.
• The wire rope (ranging in diameter from 1/16” to 1”+) and its helix configuration provide the specific resilience required to cushion fragile loads as small as a few pounds or substantial loads of many thousands of pounds, and absorb vibration through a wide frequency spectrum.
• The isolator operates well in any position: in compression, extension, shear, and roll.
• Our isolators provide protection in all axes simultaneously.
• All-metal construction makes our isolators virtually impervious to severe environments, and maintenance free.

Applications:

Helical isolators protect a broad range of loads:

• Very fragile (electronic equipment, computer hardware, optical devices).
• Highly substantial (heavy engines, machinery––during transit or while in operation, even in a moving vehicle).

See table below for more details.

Applications	Typical Equipment	Protection From	Operational Advantages
Shipboard	Electronics, Computers, Machinery	Explosive blast, Inherent vibration, Storms	Long life, Maintenance free, Temperature extremes, Corrosion resistance, All axes protection
Rough Terrain Vehicles	Instrumentation, Generators, Electronics	Rough terrain, Poor road conditions, Collision	Long life, Maintenance free, Temperature extremes, Ozone, Radioactivity, UV Radiation
Aircraft	Electronics, Computers	High-G maneuvering, Hard landings, Turbulent air	Temperature and altitude extremes, Lightweight
Shipping Containers	Optics, Instruments, Missiles, Electronics	Transit, Handling drop, Loading/Unloading	Long life, Maintenance free, Exposure to moisture, Repeated use
Industrial Equipment	Centrifuge, Dryers, Pumps	Unbalanced dynamic loads, Fluid hammer, Inherent vibration, Foundation weakness	Long life, Maintenance free, Corrosive environments
Ordnance Equipment	Missile launcher, Tank artillery, Computer controls, Electronics	Rough terrain, Railroad humping, Transit	Maintenance free, Temperature extremes, Nearby blast
Medical Equipment	Mechanical equipment necessary for patient care	Vibration from moving parts, Mobile carts-Transport shock	Maintenance free, No outgassing, Can be sterilized
Chimneys	Chimneys, Scrubbers, Measuring devices	Wind causing resonant frequencies, Stack gas causing turbulence near scrubber, etc.	Maintenance free, Temperature extremes, Corrosive environments

 

Options:

• Iridited aluminum bars are standard; however, other materials and finishes can be used.
• Variations in cable configuration are available if the standard is not suitable.

From basic transportation to aerospace, there is an application for Helical Isolators from America's Oldest Springmaker.