Patent ID: 6076615
Filing Date: 2000-06-20
Classification: E02F,E21B

Abstract:
Multi-linked working boom (35) for a working machine (10), where the boom (35) carries at the outer end a hydraulically manoeuvrable working tool, especially rock drilling equipment (17), and comprises a first pair of hydraulically manoeuvrable link arms (11,12), which are connected to the working machine (10) and a second pair of hydraulically manoeuvrable link arms (15,16) which jointably connect the working tool (17) to the first pair of link arms (11,12), wherein the second pair of link arms (15,16) is jointed to the first pair of link arms (11,12) via a link arm-forming support member (13),the support member (13) is provided with at least one stop part (13a,13b,13c) for intermittently fixing the support member (13) against an arbitrary support base by means of a tension force from the first pair of link arms (11,12),the second pair of link arms (15,16) is supported on a carrier plate (14) that is pivotally mounted on the support member (13) in two mutually crossing, vertical and horizontal pivotal planes relative to the first pair of link arms (11,12), andthe support member (13) has a separate hydraulic system (29) including a hydraulic drive motor (30) for supplying hydraulic oil separately to the power means (24,28) of the support member (13).