Patent ID: 7117952

Claim:
A system comprising: a mechanical arm; an attachment member tiltably mounted on the mechanical arm about a pivot joint, wherein the attachment member has a range of tilt about the pivot joint bounded by an extreme forward orientation and an extreme rearward orientation; an actuator operably connected to the attachment member for powering the attachment member to tilt about the pivot joint; a power system operably connected to the actuator; an electronic control operatively connected to the power system, and comprising an automatic vibration mechanism for causing the attachment member to vibrate automatically in response to an activation signal; and an operator interface in operable communication with the electronic control; wherein the system comprises a default state, and an activation state for causing the activation signal; wherein the system has a predetermined segment of the range of tilt of the attachment member that is comprised in the activation state, and a remainder of the range of tilt comprised in the default state, wherein the attachment member being selectably oriented within the predetermined segment of the range of tilt comprised in the activation state is a necessary condition for causing the activation signal; and wherein the system also has a predetermined length of time, comprised in the activation state, for the attachment member to be oriented within the predetermined segment of the range of tilt, wherein the attachment member being oriented within the predetermined segment of the range of tilt for the predetermined lenath of time is a further necessary condition for causing the activation signal.