Sports shoe cleats release torque

Interchangeable sports shoe cleats must strike a balance between ease of removal and secure retention during use. While users should be able to replace cleats without difficulty, the fastening mechanism must remain stable under load conditions encountered during activity.

Solution

Release torque is evaluated using a software-controlled torque testing system equipped with custom-designed fixtures. These fixtures ensure accurate positioning of the shoe sole specimen and precise engagement with the cleat interface.

A controlled axial load is applied during testing using a pneumatic mechanism, ensuring consistent contact between the tool interface and the cleat throughout the torque application.

Benefits

• Repeatable and application-specific testing methodology
• Automated operation for consistent and reliable results

Requirement

A global footwear manufacturer required a method to quantify the release torque of interchangeable cleats used in sports shoes. The cleats, typically designed with six to eight engagement teeth, are mounted into the sole using a standard insert system. Removal is carried out with the help of a tool, which works in designated holes in a cleat.

The goal was to provide a pass/fail criterion, where cleats can be removed with minimal effort and, at the same time, stay firmly attached to their user. This is necessary to avoid loosening under forces applied in the process of being in the ground.

Solution

A computer-controlled torque test system was engineered in a manner that the size of the test footwear was somewhat large enough to allow it enough room throughout rotational testing.

Purpose-made fixtures were designed to improve repeatability and ease of operation. The cleat is accurately aligned using a gimbal mechanism integrated with an X-Y positioning stage. The upper fixture incorporates dual engagement pins to interface with the cleat, while a defined axial load maintains proper engagement during testing.

The applied load is automatically released between test cycles in order to make the tests efficient. The control software will make a real-time capture of the torque versus angle information, determine the peak release torque, and compare it against preset acceptance values to provide an immediate pass/fail indication.

Test Equipment

• Software-controlled torque testing system
• Customised gripping and alignment fixtures