Patent ID: 8584769

Claim:
A hammer drill comprising: a body in which is mounted a motor and a hammer mechanism which is driven by the motor when the motor is activated; a tool holder mounted on the front of the body and which is capable of holding a cutting tool, the hammer mechanism, when driven by the motor, capable of delivering impacts to the cutting tool, when held by the tool holder; a rear handle, moveably mounted on to the rear of the body via at least one movement control mechanism and which is capable of moving towards or away from the body; a biasing mechanism which biases the rear handle away from the body; wherein each movement control mechanism comprises: a first mount; a rod, having a longitudinal axis, rigidly connected at one of it ends to the first mount; a second mount which slidingly engages with the rod at two distinct points only along its length to allow the rod to slide relative to the second mount in a direction parallel to the longitudinal axis whilst preventing the rod from moving relative to second mount in a direction perpendicular to longitudinal axis; wherein one mount is attached to the body and the other mount is attached to the rear handle; and wherein the second mount comprises a tubular guide which surrounds the rod and slidingly engages with the side of the rod; and wherein the tubular guide has an inner surface which tapers outwardly along its length, the guide slidingly engaging the rod at its narrowest point.