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Motion control hinges - is it all just torque?
motorbike topbox

A motorcycle top box presents an interesting problem - how to control the motion?
CSH-63 detent hinge
The CSH-63 is a detent hinge which holds things opened or closed - it has a damped version too.

S-AT lift assist stay
Strong springs allow the S-AT to make a lid feel weightless

A damped hinge like the HG-JH14-50 gives great refinement of movement.

HG-TS torque hinge
The ultimate in control -  a constant torque or friction hinge like the HG-TS is entirely predictable and reliable.

What is a motion control hinge?

A hinge offers a simple form of motion control, allowing one part to rotate around another and very often that’s entirely satisfactory. There are situations where the modification of that simple motion can be a boon.

Take for example the design of a top box for a motorcycle courier or a pizza delivery guy. The box will need to be repeatedly opened, maybe with gloves on, possibly in gusting wind and the contents may be fragile or awkward to handle. A locking stay is a possible solution but it will always obstruct access to the interior of the box. If holding the lid open is the chief consideration then a detent hinge may suit.

A click-stop hinge like the CSH-63 uses two detents, one to keep the lid open and one to keep it closed. With the optional added refinement of a damper this solution can cover most bases.

If the lid is heavy then some element of lift assist might enter the equation. The S-AT is a stay with a powerful spring cleverly engineered to give constant force that makes the lid feel weightless in use. This is very helpful for one handed operation. A spring hinge may also achieve a similar effect although it is unlikely to be as controllable.

To protect digits from unexpected closure, damped or soft closing hinges are a good solution. The damping stops the lid from slamming with the added advantage of a refined and silent motion. The HG-JH14-50 is a beautiful stainless steel hinge with a tough orifice damper that quietly returns the lid to closed position. Perhaps not the first choice for a couriers box as the damper needs to be primed by at least partial opening to be effective. It serves well in a more ordered environment - a lid to an instrument cabinet or lifting lid to a chart table on a yacht for example.

The ultimate in safety would be a full torque hinge like the HG-TS where torque is applied over the full range of the hinges orbit. No surprises with this one - the lid stays where you put it. The only consideration would be that with a heavy lid the extra effort required to lift it may be important.

There's always more than one way to find engineering solutions - Sugatsune's products give you the range and variation for the perfect answer.

Japanese saying:
Tonbi ga taka wo umu
"Tonbi ga taka wo umu" - A kite breeding a hawk 

Meaning - a splendid child from common parents

Our UK warehouse carries thousands of lines enabling us to supply much of our product range next day for orders before 3.00pm

Call us on 01189 272 955 before 3pm to order components for next day delivery
or visit our website to search our products and order a catalogue

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