Crane hook

Medium carbon steels are stronger and must be welded with care. Examples include 1040 and 1050. They are used for machinery components such as shafts, connecting rods, crane hooks, gears and axles. 

Wherever practicable, crane hooks should be fitted with safety catches to prevent slings, chains, ropes, etc. from jumping off the hook (Figure 27.11). 

Figure 27.11 Crane hook with safety catch. (Source Dickie and Short )...

Ensure that the crane hook is positioned above the load s centre of gravity. 

TTHD bearings are well suited for applications such as crane hooks where extremely high thrust loads and heavy shock must be resisted and some measure of radial location obtained. For very low speed, extremely heavily loaded applications, these bearings are supplied with a full complement of rollers for maximum capacity. 

At the Temelin NPP, disengaging of the suspension or crane hook is avoided by electric interlock of the crane fork pin motion. The engine of the pin drive mechanism is of such dimension that when the pin is loaded, it will not be set into motion. Transport of loads above the reactor and the spent fuel pond is interlocked. Handling is carried out in polar coordinates outside of this restricted area. 

The handling device consists of a frame with integrated vacuum pump, a rail with pendulum arms, four vacuum suction cups, and a swivel motor (see Fig. 4.54). Whereas the pendulum arms can be adjusted to the required workpiece diameter, the suction cups have to be installed in order to fit the cylinder type to be handled. For slow lifting and lowering of the workpiece there is a hand-controlled hydraulic cylinder between the hard eye and the crane hook. Weight forces are controlled by digital crane scales. 

Crane hooks used to lift personnel baskets will have a positive locking device equipped with a locking pin. Spring-loaded latches and self-latching mechanisms must also be closed and secured with a locking pin. 

Crane latches are needed on crane hooks to provide more safety for those handling loads with cranes or hoists. The purpose of the safety latch on the crane hook is to prevent inadvertent disconnection of the load. A falling load can be deadly. Immediate repair of defective latches is a must for proper employee safeguarding. Crane or hoist hooks that are not equipped with safety latches can be made safer by installing this device. Never weld, drill into, drill through, or modify a crane hook this could cause failure of the hook. Contact the manufacturer of the hook so the proper size of latch can be mounted on the hook, or purchase crane hooks that include special swivel latches for maximum safety. Cranes and hoists can be used in a warehouse to lift product or batteries. 

Under no circumstances are any employees allowed to ride on the load or crane hook. 

Utilize safety latches on crane hooks. Ensure that all lifting devices are seated properly on the hook and that the safety latch is in place. 

Properly ground the piece of material used in the welding process. Do not weld on a crane hook or on any materials suspended from the crane. 

Material handling equipment secured/neutralized (e.g., forks lowered when not in use, crane hooks returned)... 

It should be noted that radial loads are forces at right angles to the axis of the shaft, such as the loads imposed by straight spur gears, drive chain or V-belts [5]. Thrust loads are parallel to the shaft axis e.g. turntable on vertical shafts, loads on crane hook. 

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