Ammann engineers have developed a handle that reduces hand arm vibrations to unprecedented levels.

Ammann’s line of hydrostatic plate compactors now features a handle with hand-arm vibration (HAV) levels below 2.5 m/sec2, making Ammann one of the first manufacturers to hit this milestone. The handle has been extensively tested in the field and is now standard equipment on all Ammann APH Vibratory Plates.

“The reduction is a significant advantage for our customers,” said Felix Greive, Commercial Manager for Light Compaction Equipment at Ammann.

The reduced HAV levels enable an operator to use the plates for hours with a very low risk from vibration. In fact, countries with the strictest restrictions do not require that operators wear gloves during an 8-hour shift when the HAV level falls below 2.5 m/sec².

The vibration improvement results from the development of the patented “Z” buffer suspension of the handle, so named because the profile of the buffers has a Z shape.

The handle features the orbital steering known on Ammann plates for many years, enabling precise operation and guidance. “It makes the machine extremely responsive and easy to use for operators of all experience levels,” Greive said.

Other key features of the APH Series include ACE technology for intelligent compaction and the triple-shaft exciter system, which keeps plate movement consistent and enables smooth travel – even through heavy, cohesive soils.

The triple shaft also helps effortlessly overcome steep grades. APH machines even can climb while backfilling saturated areas – work that can leave competitive products at a standstill.

What is HAVS?

Excessive hand-arm vibration can lead to hand-arm vibration syndrome (HAVS), previously known as vibration “white finger.”

HAVS occurs when vibration causes the capillaries in the fingers to constrict. Symptoms range from tingling, numbness, pain and “blanching” (loss of color) in the fingers, as well as weakened grip due to nerve and blood vessel damage.

In severe cases the damage is irreversible. Mild cases often show improvement if the exposure to vibration ends.

It typically takes years for HAVS to develop. Precautionary measures, such as wearing gloves and limiting exposure to vibration, can reduce the likelihood of developing HAVS.

The chances are reduced even further with the new Ammann hydrostatic plate compactor handle, which meets even the world’s strictest safety standards. The HAV level on plates with this handle is so low that operators can run a machine for an entire shift without concern.