Page:Federal Reporter, 1st Series, Volume 6.djvu/400

 388 FEDERAL REPORTER. �The Cliinnock lock may be both an instant and a subse- quent locker. If the locking mechanism was set for an hour after the door has been shut and the bolts have been pushed, it is a subsequent locker. If the locking mechanism was set for an hour before the elosing of the door, and the lever is tripped before the bolts are thrown, the dog will be released ; but inasmuch as it is moved by the spring into the locking position, it will be provented from yielding to the spring by the hindrance of the bolts. When the bolts are thrust for- ward, the dog will instantly move to ita locking position, so that the lock is then an instant locker, �Infringement of the Little patent is not avoided by the fact that although the Chinnock lock has two adjustable devices for locking and. unlocking automatically at predetermined times, which are the equivalents of the Little cam mechan- ism, yet it can be used as an instant locker. The principle of locking automatically is not affected by the instant lock- ing. The lock is, and is used as an automatic locker at a predetermined time. The lever is tripped at the appointed time, and is ready to act upon the boit work when the bolts are in proper position. �The other main point of alleged difference between the two locks is that the locking devices are actuated by mechanism of different methods of operation. It is said that the Little patent shows a direct combination of time mechanism with a movable dog, while the Chinnock lock has a combination of time mechanism, latching gear, and a movable dog, and the adjustable devices are in combination directly with the latching gear. "The time mechanism works on independ- ently of the locking dog until a pin on the revolving dial trips the latch that holds the dog, whereupon the dog is shot like the boit of a spring lock." �I do not regard the latching gear and the tripping of the latch that holds the dog as strictly a mechanical equivalent for the direct action of the cam upon the dog, but it is plain that at the date of the Little patent the Chinnock method of holding and roleasing a dog was a well-known substitute for that part of the Little mechanism which performs the same ��� �