How to Lock a Bifold Door | Home Guides

Bifold door locks are available in a variety of finishes.

Bifold doors consist of hinged sections that fold against each side of an opening. The doors are practical for closets, pantries and laundry areas where space limits the swing of a standard door. Many parents find a need to lock bifold doors to keep children from accessing the contents. The operating design of the doors requires locks that, in most cases, are easier to install than standard door hardware.

Top-Mount Lock

Purchase a top-mount lock based on the thickness of the doors. Many vinyl and pine doors are thinner than oak or other hardwood doors. Typical thicknesses are 1 inch and 1 1/4 inches.

Open one of the bifold sections against the corresponding door jamb at the side of the opening. Slip one end of the top-mount lock onto the top edge of the hinged door.

Close the doors and slide the lock in place at the seam between the two doors by hand or with the provided operating wand. Slide the lock away from the seam to open the doors.

Surface Bolts

Install 3-inch-long surface bolts at the upper portions of the edge bands of the innermost doors one at a time. Close the doors and position a lock on the face of the band at the edge of one door, with the operating knob at the lower end of the bolt. Pull the knob down until it contacts the stop inside the lock. Slide the lock up so the upper end of the bolt is even with the top edge of the door.

Mark the door at the locations of the screw holes in the lock with a felt-tip marker. Set the lock aside. Make starter pits for the screws at each of the marks using an awl or a small steel punch and a hammer. Attach the bolt at the surface of the door by driving the provided screws with a screwdriver or power drill outfitted with a screw-tip attachment.

Close the door. Slide the lock up until the end of the bolt contacts the upper door jamb. Mark the outline of the end of the bolt on the door jamb. Open the door to provide clear access to the door jamb.

Bifold door locks are available in a variety of finishes.

Source: homeguides.sfgate.com

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There are locks for bifold doors

That might help:
They are a kid-safety product, but ought to be useful for pets as well...
Good luck!
:-)

Johnson Prod. Dull Brass Hinge
Home Improvement (Johnson Prod.)
  • l E Johnson #1805PPK2 2 Bi-Fold DR Hinge
  • L E JOHNSON
Johnson Prod. Johnson Prod. 1601218P 100% Full Access Folding Door Hardware Set
Home Improvement (Johnson Prod.)
  • 100% full access folding door hardware set
  • Uniquely functioning set of hinged folding door hardware
  • Complete jamb to jamb access to closet opening
  • Doors fold out and lay flat against the wall
  • Trims like a swinging door
Hager 9861 60" Heavy Duty Aluminum Box Track and Hardware
BISS (Hager Companies)
  • For doors 1-3/8 -1-3/4 (35mm-44mm) thick
  • Up to 125 lbs (57 kg) per panel bifold
  • Up to 75 lbs (34 kg) per panel multifold
  • Universal extruded aluminum track interchanges with Stanley and Johnson track and hangers
  • Hangers have 1 (25 mm) diameter wheels

Related posts:

  1. Wooden Bifold doors
  2. Custom Bifold Doors
  3. Closet BI Fold doors