Importance

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Abstract

A shock attenuating coupling device is provided for a rotary impact tool for drivingly connecting a hammer mechanism to a drive anvil. The shock attenuating coupling device includes a first coupling member, a second coupling member, a rolling member and a spring. The first coupling member has a longitudinal drive portion with an input end configured to couple for rotation with a hammer mechanism. The first coupling member also has an output end with a first engagement portion having a first ramped groove. The second coupling member is coaxial with the first coupling member and has an output end configured to couple for rotation with a drive anvil. The second coupling member also has an input end with a second engagement portion having a second ramped groove extending in a direction opposite a direction of the ramped groove. The second engagement portion is configured to cooperate with the first engagement portion. The rolling member is provided between the first ramped groove and the second ramped groove. The spring is configured to engage the first engagement portion and the second engagement portion to drive the rolling member to a resting lower-most position within each of the first ramped groove and the second ramped groove.

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First Claim