Page:Federal Reporter, 1st Series, Volume 6.djvu/399

 YALE LOCK MANDF'q CO. V. NORWICH NAT. BANK. 387 �defendant, as relates to the first and seveiith claims, is thus described : The naultiple boit work of the safe door is held by a sliding dog, which holds the boit work faat when it is thrust forward, and releases it when it is retracted. A spring in the rear of the dog tends to keep it thrust. for- ward in the loeked position. This dog is moved by a bent pivoted lever. When one arm of the lever is pressed down, the other arm moves the dog back against the force of the spring into the unlocking position, and when the pressed- down arm is released, the resistance of the other arm is withdrawn and the dog moves by the force of the spring into the locking position. �For the purpose of moving the lever, and through it the dog, into the locking or unlocking position, the lever is gov- erned by two adjustable locking Angers, oarried by a dial revolved by the time movement. Each of these fingers has a trip pin projecting from it. When one of these pins strikes the arm of the lever it presses it down, and thus moves the dog back into the unlocking position. When the other pin comes around it releases the lever, and thus permits the dog to move forward into the locking position. For the purpose of retaining the lever in the unlocking position during the interval which elapses after it has been unlocked, and before the locking pin comes around, a catch is provided. When the unlocking pin has pressed the arm of the lever down into the unlocking position, the arm passes under the end of the catch, and is held in that position. When the locking pin comes round it strikes the catch and releases the lever. The important difference between the two looks is that the Little look can only be used as. a subsequent locker, unless by the addition of some other device, as the invention specified in the patent to Emory Stockwell, No. 168,062, of September 21, 1875. The locking meohanism of the Little lock proper operated positively upon the boit work, so that if the bolts were left retracted at the time when the locking mechanism was to operate, the dog would be held in check by the retracted boit work, and the clock mechanism would be stopped. ��� �