VIBRATION DAMPED IMPACT TOOL WITH PRESSURE AIR FEED MEANS

摘要

A pneumatic impact tool comprises a housing (10) with a pressure air supply passage (19), and an impact mechanism (12) movably supported in the housing (10) and having a front opening (23) for receiving a working implement and a hammer piston (27) for delivering hammer blows to the working implement, the impact mechanism (12) is supported in the housing (10) by a pivot device (28) in a point located between the forward and rear ends (A,B) of the impact mechanism (12) and allowing longitudinal and pivotal movements but preventing in the support point radial and rotational movements of the impact mechanism (12) relative to the housing (10), and a resilient membrane (38) is located at a distance from the pivot device (28) and arranged to bias the impact mechanism (28) to a neutral position relative to the housing (10) while absorbing longitudinal as well as radial vibration movements of the impact mechanism (28), wherein the membrane (38) comprises at least one air feed passage (40) connecting the air supply passage (19) to the impact mechanism (12).