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Turnbuckles

Turnbuckles

A turnbuckle assembly is a mechanical screw device consisting of two threaded terminals and a threaded barrel.

Turnbuckles are fitted in the cable assembly for making minor adjustments in cable length and for adjusting cable tension.

One of the terminals has right-hand threads and the other has left-hand threads. The barrel has matching right-and left-hand internal threads. The end of the barrel with the left-hand threads can usually be identified by a groove or knurl around that end of the barrel.

When installing a turnbuckle in a control system, it is necessary to screw both terminals an equal number of turns into the barrel. It is also essential that all turnbuckle terminals be screwed into the barrel until not more than three threads are exposed on either side of the turnbuckle barrel.

After a turnbuckle is properly adjusted, it must be safe tied. The methods of safetying turnbuckles are discussed later in this chapter.

 

Push-Pull Tube Linkage

 

Push-pull tubes are used as linkage in various types of mechanically-operated systems. This type linkage eliminates the problem of varying tension and permits the transfer of either compression or tension stress through a single tube.

A push-pull tube assembly consists of a hollow aluminum alloy or steel tube with an adjustable end fitting and a check nut at either end.

The check nuts secure the end fittings after the tube assembly has been adjusted to its correct length. Push-pull tubes are generally made in short lengths to prevent vibration and bending under compression loads.

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