“Clockwork mechanisms” are the assemblies that are clocks or clock-like, while “timer mechanisms” (“timers”) are often the assemblies (devices) that actuate something (e. g., switch on/off).


(1)
“A timer of the type described comp-rising a clockwork mechanism, an alarm mechanism, an electric switch, means actuated by said clockwork mechanism fcr simultaneously actuating said ala'rm mechanism and closing said switch at a predesignated time, means for prohibiting the `actuation of said alarm mechanism while permitting the closing of said switch, and means actuated by said clockwork mechanism for opening said switch at a predesignated time”
+
“Figure 5 is a fragmentary isometric view of parts of the timer mechanism”
http://www.google.com/patents/US2633507
drawing - http://patentimages.storage.googleapis.com/pages/US2633507-0...


(2)
“Timer mechanism
US 2783835 A”
“...the timer may be adjusted for automatic operation by turning the control knob 35 as far as it will go in a clockwise direction”
http://www.google.com/patents/US2783835