A tangent mechanism, when referred to in a tangent piano, strikes the string and remains in contact with that string to set the pitch at which it vibrates, unlike the hammer of the modern pianoforte which is padded and is designed to rebound off of the string it strikes. This is also unlike the harpsichord which used a mechanism to pluck the strings. The tangent piano is a very rare keyboard instrument that resembles a harpsichord and early pianos in design. ... A hammer has a primary meaning of a really hot chick. ... The piano Piano is a common abbreviation for pianoforte, a large musical instrument with a keyboard (see keyboard instrument). ... A harpsichord is the general term for a family of European keyboard instruments, including the large instrument nowadays called a harpsichord, but also the smaller virginals, the muselar virginals and the spinet. ...
A forced steering mechanism is attached to the truck connected to steer at least one of the axles and a pair of wheels.
During the travel on tangent tracks, the relatively loose connection, to be described, between the car body and truck permits limited lateral movement of the car body and some self steering without actuating the forced steering.
Although the truck is riding on a tangent track, it is undesirable to have the self steering effective in the presence of excessive lateral motion.
We will be concerned mainly with mechanism properties that are determined by the geometry of the kinematic chain and the choice of the end-effector, but do not depend on the choice of actuators.
We could say that the mechanism can be used both as a translational and as a rotational device and the transition between the two modes of operation may occur when the device goes through a constraint singularity.
We can conclude that once the mechanism is assembled with zero platform orientation it can move only as a positioning device until it reaches one of the configurations defined by conditions (a) or (b).
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