was necessary to either attach the device to an external fixed object or to built a full frame to
support the device.
Pulley System
Design Concept
The pulley system consists of two pulleys, positioned identically to the pulleys in the Shirt Horn.
However, a clip is attached at one end of the string which is intended to clip on to the back of the
user’s shirt and pull the shirt over Elsa’s head.
Design Rationale
The pulley system is required to redirect the force that the user applies. As Elsa can apply a
significant sustained downward force, it was necessary to use this to an advantage (see Appendix
E: User Testing Summary). As the pulley can convert a downward force on one end to an upward
force which pulls the shirt up, it