US 5,400,860 AGranted

Apparatus for reducing vibration transmission in hand-held tool

AssigneeIngersoll-Rand Company

InventorsAnthony Best, Stephen J. Neads

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Abstract

An air-operated percussive tool incorporates apparatus for reducing vibration transmission from a working end portion (1) to a hand grip (2), thereby to reduce vibration transmission to the hand/arm of the user. The apparatus includes a male frustoconical portion (3) whose tip is located facing a female bed (4) with the base of the frustoconical part attached to the handle grip (2) while the bed (4) is attached to the working end portion (1). Three rubber balls (5) are trapped between the portion (3) and bed (4) and the balls (5) are located in their mean positions under compression. Oscillatory movement of the female bed parallel to the longitudinal access of the frustocone causes the balls to roll on the male and female surfaces and effectively provide a rising spring rate or stiffness. Apparatus is also disclosed for reducing vibration transmissions from the working portion to a casing (12) of the tool.

Claims23

Dependent claims

A hand-held percussive tool having means for reducing vibration transmission from a working potion of the tool to the user;

said tool comprising a working tool potion, a handle potion, and a casing which surrounds part of said handle potion and is radially displaced therefrom;
said working tool potion and said handle potion including a male part associated with one of said potions and a female part associated with the other of said portions, said male part and said female part being in facing relationship and axially-spaced apart and at least said male part including a frustoconical surface;
first means including a resilient ball arrangement comprising a plurality of non-contact resilient balls interposed between said handle portion and said working tool portion for reducing axial and radial vibration transmission from said working tool portion to said handle portion;
and
second means for reducing vibration transmission from the working tool portion to the casing, said second means being located adjacent the working tool portion and between the casing and the working tool portion.

2 more elements

Dependencies are inferred from the claim text.