Locking screw

A locking screw or clamping screw on a mechanical component or on a measuring device is used to fix its position or angular position . For larger components, locking levers are also used, which work on the principle of the eccentric .

Locking screws come in very different sizes, designs and levels of precision. Some examples in decreasing size are:

• Heart screw for survey tripods with which a theodolite is clamped onto the tripod plate
• Coarse clamps on the axes of rotation of an astronomical telescope or a universal instrument . After closing the clamp, the fine movement can be activated
• Leg screw on a board compass or on a bevel for fixing the set angle
• Clamping screw on a sight or a photographic ball joint to fix the orientation towards a target point
• Locking screw on a cable release to keep the shutter of a camera open during a long exposure time
• Adjusting screws and worm screws on fine measuring instruments ( dial gauge , micrometer etc.) or on leveling vials
• Adjustment screws on braces or a jaw spreader
• Fixing screws inside a pocket watch or wrist watch

As screws , however, are screws referred to also allow its controlled, small displacement or rotation in addition to the fixation of a component, see adjusting screw .

literature

• Erich Siebel (Ed.): Testing and measuring equipment. Springer Verlag Berlin Heidelberg GmbH, Berlin Heidelberg 1940.
• Kurt Simon: Technical English. A guide for engineers, technicians and specialist translators, 2nd improved edition, Springer Verlag Berlin Heidelberg GmbH, Berlin Heidelberg 1990, ISBN 978-3-540-62134-8 .