Sisänarraote

Sisänarraote is a Finnish term that can be translated as "inner grip" or "internal clamp." It is primarily used in a technical context, particularly in engineering and manufacturing, to describe a method of fastening or holding an object in place from the inside. This contrasts with an external grip, where a component encircles or clamps the outside of the object.

The principle of sisänarraote involves applying force inwards from the periphery of a hollow object or a feature with an internal recess. This can be achieved through various mechanical means. For example, a mechanism might expand radially outwards within a bore or cavity, creating a secure hold. Alternatively, it could involve wedging elements that are pushed inwards, creating friction and preventing movement.

Applications of sisänarraote can be found in tools, machinery, and various assembly processes. It is often employed where an external fastening would be impractical, aesthetically undesirable, or would compromise the structural integrity of the outer surface. Examples might include internal chucks used in machining, certain types of pipe couplings, or internal locking mechanisms in devices. The effectiveness of a sisänarraote relies on precise engineering to ensure sufficient clamping force without causing damage to the held object.