Quick disconnect coupling for saw blade


Tractive AB puts great emphasis on creating technical solutions for its products that are safe to use. This is the most important criteria when our machines are designed.

All saw heads except the Pentruder 6-12 Lean and Pentruder 6-8 HF are equipped with a patented quick disconnect coupling for the saw blade. The intention with this coupling is primarily to enhance safety and handling.

A unique patented coupling for the blade flange enhances safety and simplifies awkward set-up’s considerably, especially when flush cutting must be performed. The saw blade can always be fitted, after the machine is mounted, radially, and heavy and troublesome set-up’s can be eliminated to a great extent.

Mounting a saw blade for flush cutting has always been relatively awkward and often one must mount the saw head and the saw blade together, and it can be difficult to mount also a normal saw blade for the upper or the lower cut, or even for vertical cuts if the available space is limited.

 With Pentruder’s quick disconnect all these problems are gone. Provided the operator is trained in the correct operation of the coupling it will provide considerable improvement on both safety and efficiency.

Function principle:

The saw blade is fitted on a blade flange by means of an outer collar and clamped by means of a special pin screw and bolt, or, for flush cutting, on a special flush cutting flange by means of 6 countersunk screws and nuts.

The blade flange, regardless of type, is provided with a radial T-slot to the centre of the flange. The flange, with blade fitted, is mounted on the machine spindle and its pull stud which fits in to the T-slot in the flange. When the coupling is tightened with the locking screw at the rear of the spindle, the flange is clamped towards the machine spindle by the pull stud which then moves inwards.

The flange and the spindle are provided with drive dogs to transmit the torque to the blade. The dogs must always be aligned, in mesh, for the coupling to work properly.

At the same time as the pull stud moves inwards, a conical centering ring moves outwards to centre the flange on the spindle. This ring at the same time interlocks the coupling by blocking the T-slot.

This principle is very safe, as it does not require more than one single operation to be carried out to clamp and interlock the coupling. Even if the coupling is not completely tightened the saw blade can not fall off the spindle as the conical ring keep the blade on the spindle. It is however very important that the dogs are completely in mesh before the coupling is tightened.