Showing papers on "Slewing bearing published in 1986"
Patent•
15 Sep 1986
TL;DR: In this article, a machining apparatus is mounted on the cage of a slew bearing to grind the bearing surface of a rail section, with a grinding profile 30 which it may follow to perform the desired cut along the rail section.
Abstract: Machining apparatus (10) which can be mounted on the cage (15) of a slew bearing (12) to grind the bearing surface (23) of a rail section (13). The machining apparatus is provided with a grinding profile 30 which it may follow to perform the desired cut along the rail section (13).
2 citations
Patent•
02 Jan 1986
TL;DR: In this article, an auxiliary safety system for crane and particularly for tower crane with horizontal sewing jib is presented, in order to give the greatest safety either to such slewing jib against yieldings of those mechanical members or elements which are provided to maintain them in their horizontal slowing state, and to the upper slewing section of the crane tower the axis of which is to be maintained in its vertical position within the forecast limits of tolerance.
Abstract: An auxiliary safety system for crane and particularly for tower crane with horizontal sewing jib. In order to give the greatest safety either to such slewing jib against yieldings of those mechanical members or elements which are provided to maintain them in their horizontal slowing state, and to the upper slewing section of the crane tower the axis of which is to be maintained in its vertical position within the forecast limits of tolerance, such auxiliary safety system comprises a first auxiliary safety means formed by tension ropes (20, 21) operating elastically through the co-operation of spiral springs (28) to maintain the jib/jibs (11, 12) in their horizontal slewing plane, and a second auxiliary safety means formed by a cage (16) extended upwards from the area of thrust bearing (15) between stationary and slewing sections (13, 14), respectively of crane tower and provided with a top collar (30) on the inner perimetrical surface of which rollers (31) mounted on said slewing section (14) are pushed elastically and rolling, in order to maintain the axis of this latter in its vertical, central position.
2 citations
Patent•
11 Sep 1986
TL;DR: In this paper, a freely rotatable jib crane with a three-point bearing on the chassis of the jib is proposed to adjust the crane during vertical positive guidance of the revolving superstructure.
Abstract: In a freely rotatable jib crane, three-point bearing (14, 16, 16') of the slewing ring (13), underpinning the revolving superstructure (12), on the chassis (11) is proposed. The three-point bearing (14, 16, 16') enables the revolving superstructure (12) to be adjusted during vertical positive guidance of the revolving superstructure (12). One (14) of the bearing points is formed by a standard pivot bearing, and the two other bearing points (16, 16') are each formed by two bearings (161, 162 or 161', 162'), of which one (161, 161') is arranged on the chassis (11) and the other (162, 162') is arranged on the revolving superstructure (12). A spindle (163 or 163') extends between the bearings (161, 162 or 161', 162'). When the chassis (11) is slanting, the slewing ring (13) can be shifted into the horizontal by actuating the spindle (163 or 163'), whereby the crane base (121) is orientated perpendicularly.
1 citations