Patent ID: 8627572
Filing Date: 2014-01-14
Classification: B27B

Abstract:
1. A coasting brake arrangement for a power tool having a work tool, which coasting brake arrangement comprises: a speed controlling throttle trigger member; a force transmitting cable member having one end operatively connected to the throttle trigger member and another end operatively connected to a first brake member, which is biased towards a cooperating rotary second brake member that rotates when the work tool is running, so that the work tool is free to run when the throttle trigger member is pushed in but braked when the throttle trigger member is released to make the first brake member press against the second brake member in order to prevent the work tool from running, a mechanism connects said one end of the cable member to the throttle trigger member and is designed to restrict pulling of the cable member to an initial phase of the pushing in of the throttle trigger member; wherein the throttle trigger member is mounted in a rear handle of the power tool and includes a throttle trigger button and an arm extending from the throttle trigger button in the direction of the rear handle, the arm being at least partially journalled inside the rear handle to permit pivotal movement of the throttle trigger button, said mechanism including a cam and a cam follower that is operatively connected to said one end of the cable member, the brake members being firmly pressed against each other when the throttle trigger button is released, but on pushing in the throttle trigger button, a relative movement between the cam and the cam follower causes the cam follower to pull the cable member to separate the brake members from each other to release the work tool for rotation; and wherein the cam has a cam surface shaped as a part of a cylinder at constant distance from the pivotal axis of the throttle trigger arm, whereby on further pushing in of the throttle trigger button, the cam follower rests against the cam surface without further pulling the cable member.