Читать книгу Rudimentary Treatise on the Construction of Locks онлайн

36 страница из 53

fig. 7. Section to shew the action of wards.

It is not at a first glance that the relation between the clefts in a key and the wards of a lock can be duly appreciated; because the wards present themselves to view as portions of circles to which nothing in the key seems to correspond; but if it be borne in mind that the key has a rotary motion within the key-hole around the pipe or barrel as an axis, the circular form of the wards will be accounted for, and their section will be regarded as exhibiting the looked-for relation to the wards of the key. In the annexed cut, for example (fig. 7), which represents a portion of the interior of a warded lock, the curved pieces of metal are the wards (two in this case); and there are two clefts in the bitt of the key to enable the latter to take its circular course without interruption from the wards. If the clefts were other than they are, either in number, position, or size, this freedom of the key’s movement could not be obtained.

fig. 8. End sections of keys.