Handling: hand and hoist-line implements – Spacing hoist bar or frame – Load gripping units
Patent
1981-11-20
1984-04-24
Marbert, James B.
Handling: hand and hoist-line implements
Spacing hoist bar or frame
Load gripping units
294 67DA, 294 67R, B66C 142
Patent
active
044444265
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a locking device assembly commonly known and hereinafter referred to as a twistlock assembly for mounting into a lifting beam generally called a spreader, which is particularly designed to be coupled to load carriers, containers or the like equipped with standardised fittings to facilitate lifting, i.e. fittings incorporating openings to permit releasable coupling to a locking device such as may be fitted to a spreader. It is most important that the lifting and handling of containers is effected quickly and with great operational safety. This demands that the equipment is robustly manufactured and that, despite this, when the lifting device is damaged or deformed, repairs can be effected with the minimum of delay. All known types of spreaders require tools to effect the replacement of the twistlocks which enter into and couple with the lifting fittings of the container. These lifting fittings, which are part of the construction of a container, are hereinafter referred to as corner castings. Twistlocks, because of their extended situation, are most prone to damage. When damage occurs, it is important that repairs are effected quickly, otherwise great expense may be incurred because a ship may be compelled to wait for loading whilst repairs are being made. Furthermore, in many ports and terminals it is a requirement that any such repairs must be carried out by an authorised mechanic when any such repair demands the use of tools or similar equipment.
Usually a lifting spreader is releasable coupled to a container by means of corner castings with oval apertures permanently fixed within the container top being coupled to rotatable twistlocks with oval locking heads mounted within the underside of a spreader. Twistlocks, in their open position, can be inserted into the said openings and after being rotated approximately 90 degrees to a locking position, secure the corner casting to the twistlock thereby coupling together the container and the spreader. Each twistlock is mounted in a bearing house or support plate and is rotated by an operating device, for example an hydraulic cylinder, which is releasably connected either directly or indirectly to the shaft of the twistlock.
The present invention discloses a construction which enables damaged twistlocks to be replaced without recourse to tools and without special knowledge or ability. This means that stevadores or crane operators can themselves effect repairs in a simple way and whereby the above-mentioned disadvantages can be avoided.
This invention discloses a manually easily mountable and demountable twistlock assembly, the shaft of said twistlock being provided with a groove around its circumference to accept a locking element such as a pair of semi-circular locking rings arranged to bear upon the twistlock bearing house thereby preventing axial displacement with lifting and whereby a casing, arranged to hold the locking rings in place in the twistlock groove, is prevented from axial displacement primarily by the bearing house and its associated elements during working rotation of 90 degrees and yet can be axially released for removal of the twistlock by its being turned past the extent of its normal working area, i.e. past either the twistlock locked or unlocked position.
The invention is below described with reference to the accompanying drawing, showing a selected example of a twistlock in a container spreader, where
FIG. 1 shows a side view of the device,
FIG. 2 shows a section of the device through the line II--II in FIG. 1,
FIG. 3 shows a plan view of the device,
FIG. 4 shows a section through an alternative arrangement of the device and
FIG. 5 shows a section through line V--V in FIG. 4,
FIGS. 6 and 7 in the same way as FIGS. 4 and 5 show yet a further alternative arrangement of the device.
In FIG. 1 the device in its entirety is marked with the FIG. 1. The twistlock is mounted in a hole through a corner of the spreader frame which is here shown in section and is marked 2. Within the hole, and firmly secured to the spr
REFERENCES:
patent: 3749438 (1973-07-01), Loomis et al.
patent: 3751096 (1973-08-01), Wyon
patent: 3892436 (1974-07-01), Fathauer
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