A Reinforced Polymer Hammer Cap for Eliminating Metal-to-Metal Contact and Reducing Hand-Transmitted Vibration
2006
A hammer fitted with a polymer cap on the impact face has been developed and
successfully used to drive nails. As configured, the hammer-cap assembly eliminates direct metalto-
metal contact during nail driving. Unlike non-marring and other protective hammers, the design
utilizes a high performance reinforced polymer which does not reduce hammer performance.
Experiments to measure the nail driving characteristics of conventional hammers and hammers fitted
with a polymer cap revealed no significant difference in driving capability. Vibration measurements
on the handle of several hammers fitted with caps revealed that vibrations at the handle-hand
interface were significantly reduced compared to conventional hammer designs. Sound pressure
levels were also significantly reduced. Unlike previous work with hand-struck chisels fitted with a
cap, the polymer modulus had much less effect on performance.
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