| 摘要 |
<p>A handleset has a pivotal thumb piece 10 which drives a half round spindle 16 to operate a latch assembly, and a key operated cylinder assembly 40 which acts to disengage the thumb piece by turning a spindle 42. A driving pinion 56 for the spindle 16 is mounted for rotation on the spindle 42 and is engaged by teeth on a rack 52. The pivotal thumb piece 10 acts to move a connector 26 upwardly against spring bias and to move a locking arm 38 via a flange 36 of the arm locating in an arcuate slot 34 of the connector 26. The spindle 42 has a cam 44 secured thereto which locates in an arm opening 38 so that turning the key results in the cam 44 rotating the arm 38 - the flange 36 moving along the arcuate slot 34. The arm 38 and the rack 52 have formations that interagage in one position of the flange in the slot to transmit movement of the thumb piece to the spindle 16 via the rack and pinion. When the arm 38 is rotated by the action of the key cylinder, a pin 48 on the arm moves out of a slot 50 on the rack and a formation 47 on the bottom of the arm 38 moves clear of a pad 50 on the rack so that any upward movement of the arm 38 effected by the connector 26 is not transmitted to the rack.</p> |
