Turnbuckle

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Turnbuckle, lock nuts and threaded rods in a Malakow tower
Screw coupling of railway wagons
Shroud tightener on a sailing boat
Small turnbuckle with the associated screws

A turnbuckle is a double nut with a right-hand and a left-hand thread , which holds two tie rods with corresponding external threads together by tensile stress. By turning in one direction or the other - the double nut has a transverse hole or a hexagon in the middle - it tightens the rods or loosens the connection.

The compact design as a yoke-shaped double nut is called a turnbuckle or hook. This includes two different eye or hook screws with right or left thread .

Uses

Turnbuckles and bolts are very often used to tighten ropes or wires (suspension bridges, wire fences). Furthermore, due to the variability of the clamps, ceiling structures can also be anchored and held. Many clamping elements must be adjusted to the same tension.

Clamping elements allow the tightening of chains in the load securing transportation ( lashing , straps ) often using a built-in ratchet, to which a tubular steel lever is pushed.

On sailing yachts , tensioning screws are used to tension a wire railing . Turnbuckles (as turnbuckle hereinafter) are used to control the voltage of shrouds , and shrouds set.

Clamping screws are often used on machines to adjust play, a working stroke or a spring force. They are often provided with lock nuts for this purpose .

The variability is that in constructions with several ropes or tie rods, the tensile stress of each individual tensioning screw can be readjusted and thus corrected.

In steel construction practice , tensioning screws are often used to adjust components to each other in position with millimeter precision. For this purpose, the adjustment elements are temporarily welded to the components to be moved . The components can then be positioned by screwing them apart or together. Reversing the direction of movement causes play and hysteresis . After fixing the position - usually with screws, rivets or even full welding - the clamping screws can be removed again.

Clamping screws are also used in furniture construction to connect two parts of a box or a worktop.

A simple coupling of railway wagons to the locomotive and among each other also uses a very large clamping screw (see picture).

Details on dimensions and load capacity can be found in several standards, including DIN 1478 .

Web links

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