Boom point assembly for an excavating machine
AssigneePage Engineering Company
InventorKrishnaswamy Rangaswamy
Life of this patent
Estimating the term…
Abstract
A boom point assembly is provided with a sheave or sheaves that are swivel mounted to allow the sheaves and the cables supported thereby to swing sidewise relative to the centerline of the boom without applying substantial twisting forces on the boom and without causing undue wear on the sheaves or on the cables. The cross-shaft or pin for supporting the sheave or sheaves is mounted in the side cheeks of the boom point assembly with the axial thrust from the sheave bearings and mount being transverse to the cross-shaft or pin and being transmitted through a support pylon to the chords of the boom frame.
Claims12
A dragline excavating machine having a housing and a boom pivotally mounted at one end portion to said housing, a boom point assembly mounted on the other end portion of said boom and having a pair of side plates, a cross-shaft traversing the space between said pair of side plates, the end portions of said shaft being fixed in said plates, boom support lines running from said housing to said plates of said assembly, a bearing support connected to the end of the boom and to the cross-shaft and having bearing means thereon, said bearing support having an axis extending outwardly from the end of said boom, a saddle mounted on said bearing means for rotating movement about said axis of said bearing support, said saddle having a hub with an opening through which said cross-shaft extends, said opening in the hub being elongate in a vertical plane with the long axis of the opening extending vertically relative to the axis of the cross-shaft, a sheave rotatably mounted on said hub and saddle, a thrust bearing between said bearing support and said saddle for transmitting thrust loads from said saddle to said bearing support and to said boom, and a haul line running from the housing around the sheave and being connected to a bucket whereby side-to-side swing of the bucket cants the sheave, hub and saddle from side-to-side about the axis of the bearing support with said saddle rotating on said bearing means for keeping flanges on the sheave substantially in alignment with the haul line from the bucket.
An excavating machine having a housing movably mounted on a ground anchoring pad, a boom having at least three main chords and being pivotally connected at one end to said housing, a boom point assembly fixed in axial alignment with said boom at the other end thereof and having a pair of side plates, a cross-shaft traversing the space between said side plates and having end portions of the cross-shaft fixed to said side plates, an end plate carried by the ends of the chords of said boom, boom support lines extending from said housing to said side plates of said assembly, a bearing support connected to said end plate and to the center portion of said cross-shaft and having a bearing surface and a thrust bearing thereon, at least one sheave carried by said bearing support and having a mounting means connected to the midportion of said sheave, said mounting means encircling a portion of the bearing support and applying weight to said bearing surface and applying thrust to said thrust bearing thereon, said mounting means having oblong side openings through which said cross-shaft passes with the major axis of the oblong lying generally vertical, and a haul line running from the housing around the sheave and being connected to a bucket whereby side-to-side swing of the bucket cants the sheave from side-to-side with the mounting means of the sheave riding on the bearing surface for permitting the flanges of the sheave to substantially align with the haul line as said oblong openings permit said mounting means to rotate relative to said cross-shaft.
A boom point assembly for an excavating machine having a boom with a pair of spaced apart side plates connected at the outer end portion thereof, a cross-shaft traversing the space between said pair of side plates, a bearing support connected to the outer end of said boom and to the center portion of said cross-shaft, said bearing support having a curved bearing surface and a thrust bearing surface at right angles to each other, a saddle movably mounted on said curved bearing surface and applying thrust to said thrust bearing surface, at least one sheave rotatably mounted on said saddle, said saddle having enlarged openings through which said cross-shaft passes, and a haul line passing around the sheave and being connected to a bucket whereby side-to-side swing of the bucket moves the sheave and saddle from side-to-side relative to the cross-shaft for keeping the flanges of the sheave substantially in alignment with the haul line to the bucket and thrust loads on the sheave from the haul line are transmitted through the thrust bearing and the bearing support to the boom.
Dependencies are inferred from the claim text.