| 摘要 |
A key operated rotatable plug and cylinder define pin-receiving holes arranged in first, second and third rows that extend in first, second and third planes, respectively that radiate from a common center axis that extends substantially centrally through a plug-defined keyway. A key of generally rectangular cross-section is insertable into the keyway to bring recesses that are formed in its two relatively flat side surfaces and in one of its narrow edge surfaces into alignment with the pin-receiving holes so that inner ends of tumbler pins that are carried within the holes are received in the key-defined recesses to position the tumbler pins to permit plug rotation relative to the cylinder. The first plane extends from the center axis through the holes of the first row, and parallels the opposed, relatively flat side surfaces of a keyway-inserted key. The second and third planes extend from the center axis through the holes of the second and third rows, respectively, and position the second and third rows of pins so that they are inclined relative to the first plane at angles 1) that are unequal, 2) that do not cause the second and third planes to extend within a common plane, and 3) that are separately chosen from a set of values that reside between about seventy five and about one hundred five degrees, with values of ninety and one hundred five degrees being avoided in the selection of at least one, preferably both, of these angles.
|
