Patent ID: 7517029

Claim:
An extension and retraction arrangement with a control system for a monitor on a work surface comprising: a trolley structure; a rail arrangement with a first end, a second end, and a body portion; and a means for retaining the trolley structure in relation to the rail arrangement for axial extension and retraction along the body portion of the rail arrangement wherein the trolley structure has a retracted configuration wherein the trolley structure is disposed adjacent to the second end of the rail arrangement and an extended configuration wherein the trolley structure is disposed adjacent to the first end of the rail arrangement; and a control system with an actuating arrangement and a means for selectively controlling a travel of the trolley structure in relation to the rail arrangement in response to an actuation of the actuating arrangement wherein the means for selectively controlling the travel of the trolley structure in relation to the rail arrangement comprises a means for mechanically engaging and disengaging the trolley structure in response to the actuation of the actuating arrangement comprising a first locking projection, a means for adjusting the first locking projection into and out of engagement with the trolley structure based on the actuation of the actuating arrangement, an actuating rod, and a first pivot member pivotally retained relative to the actuating rod wherein the first locking projection is retained for movement with the pivot member whereby an actuation of the actuating rod pivots the first locking projection of the first pivot member into and out of engagement with the trolley structure.