Showing papers on "Slewing bearing published in 1976"
Patent•
23 Oct 1976
TL;DR: The rolling bearing race assembly has internal gear teeth in its inner race as discussed by the authors, and the inner race has external groove for thrust and radial load bearing rollers, and the external race inner rim projects into the groove.
Abstract: The rolling bearing race assembly has internal gear teeth in its inner race. The inner race has external groove for thrust and radial load bearing rollers. The external race inner rim projects into the groove. The race (1) with groove (2) is an integral ring. The race with inner rim (4) is formed by joining several segments connected to another integral ring (8). The inner integral race (1) has internal gear teeth (12).
13 citations
Patent•
25 May 1976
TL;DR: The Slewing Tower Crane (STC) as discussed by the authors is a crane with a telescopic tower, tilting on the crane superstructure between the vertical working and horizontal transport positions.
Abstract: The slewing tower crane has a telescopic tower, tilting on the crane superstructure between the vertical working and horizontal transport positions. The superstructure is mounted by means of a slewing ring on the chassis, and the jib is in two sections hinging together, with a crab travelling along it. The derricking gantry (12) forms part of a crank linkage (13, 14) supporting the jib (8), and pivots freely on the top of the tower (9). It has a derricking rope (15) reeved between its free end and the superstructure (3), and whose length matches that of the extended tower. The jib can be of the telescoping or folding type.
3 citations
01 Jan 1976
TL;DR: In this article, a simplified dynamic model of a luffing crane has been used to derive the magnitude of the dynamic factor which occurs when a load undergoing sinusoidal motion is lifted.
Abstract: The paper presents the theoretical background to a study of the dynamic effects experienced by cranes on offshore platforms. The study was initiated to review cranes operating in Bass Strait, Australia. A simplified dynamic model of a luffing crane has been used to derive the magnitude of the dynamic factor which occurs when a load undergoing sinusoidal motion is lifted. A theoretical idealisation of a crane was established to determine stiffness. Calculated values of crane stiffness are presented to show the influence of crane properties and operating radius. Dynamic factors for six different cranes are given, showing the influence of wave conditions, geometry and reeving of the hoist system. Overturning moments occurring on the slewing ring are considered in relation to their original design values.
3 citations