Doorknob

Doorknob

A doorknob is a type of mechanical device used for opening and closing a door. It is typically a round or spherical object that is attached to a door and can be turned to operate a latch or bolt mechanism. Doorknobs are commonly found in residential, commercial, and industrial buildings.

History

The use of doorknobs dates back to the 18th century. Before the invention of doorknobs, doors were commonly secured with latches or locks that required keys. The development of the doorknob allowed for easier and more convenient access to rooms and buildings.

Types of Doorknobs

There are several types of doorknobs, each designed for specific purposes:

• Passage Doorknobs: These are used on doors that do not require locking, such as closet doors or hallway doors.
• Privacy Doorknobs: These are used on doors that require locking from the inside, such as bathroom or bedroom doors.
• Dummy Doorknobs: These are non-functional doorknobs used for decorative purposes or on doors that do not need a latch mechanism.
• Keyed Entry Doorknobs: These are used on exterior doors and can be locked and unlocked with a key.

Materials

Doorknobs can be made from a variety of materials, including:

• Brass
• Stainless steel
• Glass
• Porcelain
• Wood

Mechanism

The basic mechanism of a doorknob involves a spindle that connects the two knobs on either side of the door. When the knob is turned, the spindle rotates and retracts the latch, allowing the door to open. Some doorknobs also include a locking mechanism that can be engaged or disengaged with a key or a thumb turn.

Installation

Installing a doorknob typically involves the following steps: 1. Drilling holes in the door for the knob and latch. 2. Inserting the latch mechanism into the edge of the door. 3. Attaching the doorknob to the door using screws. 4. Ensuring that the latch aligns with the strike plate on the door frame.

Related Pages

• Door
• Lock (security device)
• Latch
• Handle
• Hinge
• Key