Door handle

A Doorknob ( and door handle or door handle, Switzerland. Door latch ) is a lever-like device ( handle) to open and close the snap - lock a door.

Requirements and technology

This lever must enable the following functions: a thumb brake for the localization of the handle without vision, the forefinger furrow to lead the Umfassungsgriff, the palm rest increases the handle mechanism and the catching volume is the hand during the movement of the latch secure hold an adequate contact area as possible. Often, the end of the handle is bent towards the door to prevent snagging of clothing.

The doorknob, together with its enclosure door fittings, the (often with cover) has a keyhole or an additional locking device, when the door lock is lockable. Because of the strong mechanical stress doorknobs are mostly made of stainless steel or brass or at least contain a metal core. Doorknobs usually occur in pairs, there is a positive and a negative is that can be stuck into each other. Only with the positive, you can open the door, but not with the negative. Usually the two levers a doorknob by means of a pusher mandrel are interconnected. This actuates the snapper ( also called case ).

With rising crime and safety fittings are always relevant. These are a core protection that prevents pulling or drilling the lock, equipped. In most cases, these sets have a forged steel plate to prevent or make it difficult to drill through the plate.

A gymnasium mussel is a doorknob for thick doors where the door handle is mounted flush in the door. The name comes from the fact that this form commonly found in gyms use to reduce the risk of injury during sports activities.

Dissemination

In many countries outside of Europe, but also in the UK, will be held mostly handles door knobs ( doorknobs ), which are either rotatable or only serve as handles for doors which can be turned on and snap out by pressure and train. Combinations of jack and button are, however, increasingly used in Central Europe for front doors.