How do uPVC Sliding Door Keeps Work?

The primary locking mechanism in a uPVC sliding door is typically a hook lock or a “touch lock” / “crescent lock” system.

• Hook Locks: These are very common for security. When you engage the lock (usually by turning a key or a thumb-turn), multiple hook-shaped bolts extend from the edge of the sliding door sash. The “keeps” for these hooks are specifically designed slots or receivers on the fixed frame or static panel that the hooks latch into. This prevents the door from being lifted off its tracks or forced open horizontally.

• Touch Locks / Crescent Locks: These are often simpler locks found on sliding windows or secondary sliding doors, or as supplementary locks. A “touch lock” usually has a latch that slides into a small keep on the frame. A “crescent lock” often features a crescent-shaped lever that rotates to engage with a fixed pin or loop (the keep) on the frame. These are more about holding the door closed than providing high security.

   

Key Functions of uPVC Sliding Door Keeps:

1. Security: This is paramount. They provide the anchor points for the locking bolts, preventing the sliding door from being opened by force. Good multi-point locking systems will have several keeps for multiple hooks along the vertical edge of the door.

2. Alignment and Stability: While the rollers primarily handle the weight and movement, the keeps help to pull the door into its final, secure position and prevent rattling when locked.

3. Weather Sealing (Indirectly): By ensuring the door is pulled tightly into its locked position, keeps contribute to the compression of weather seals, which helps prevent drafts, dust, and water ingress.
   
   

Types of uPVC Sliding Door Keeps:

The specific type of keep will depend heavily on the brand and model of the multi-point locking system used in your sliding door.

• Hook Lock Keeps: These are metal plates with precisely cut slots that correspond to the number and spacing of the hook bolts on your sliding door lock. They can be full-length strips or individual plates for each hook.

• Latch/Deadbolt Keeps: For the main central locking point that might include a deadbolt or a standard latch mechanism, similar to a casement door’s central keep, but designed for a sliding application.

• Touch Lock Keeps: Simpler, smaller plates or brackets designed to receive the latch of a touch lock.

• Crescent Lock Keeps: Often a simple pin or small metal loop that the crescent lever engages aroun.