How it works
A bifold door is pairs of hinged panels hung from a top track. Each pair swings on a top pivot and a bottom pivot at the jamb, while a guide at its free end runs along the track.
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Parts of a closet door that folds
At the jamb, the top pivot sits in a pivot bracket in the track and the bottom pivot in a jamb bracket on the floor. At the middle, each lead panel carries a guide, a knob and, on the back, an aligner.
Adjusting it
Turn the threaded bottom pivot to raise or lower a pair. Slide the top pivot bracket along the track to move it in or out. Set the snugger so it meets the guide when the door is shut.
Questions and answers
What are the parts of a bifold door called?
Door panels joined in pairs by hinges, a top track, a top and a bottom pivot at the jamb, a top pivot bracket, a jamb bracket on the floor, a guide at each pair's free end, a snugger, knobs and aligners.
What is the wheel on top of a bifold door called?
The guide, also called a roller, slide guide or guide pivot. It sits in the top of the panel at the free end of each pair and runs along the track as the door folds.
What is a snugger on a bifold door?
A small block set in the top track beside the guide. With the door shut it meets the guide, holding the pair closed.