F - Mech Eng,Light,Heat,Weapons – 16 – H
Patent
F - Mech Eng,Light,Heat,Weapons
16
H
365/25
F16H 35/18 (2006.01) H03J 1/08 (2006.01) H03J 5/10 (2006.01)
Patent
CA 1050181
Abstract of the Disclosure A frequency selector comprising a first control member for frequency preselection changing and a second control member for changing the preselec- tion frequency. The first control member can be pushed manually to position successive screws, each representing a preselection frequency, at a particu- lar location in which the screw by abutment with a feeler rod sets a tuning member at the preselection frequency. Each screw carries an extremely toothed nut which at the predetermined location can engage with a toothed wheel carried on the second control member. Rotation of the second control member causes rotation of the nut and advancement or retraction of the screw to adjust the fine tuning. A catcher member associated with the first control member engages the toothed wheel whenever the first control member is oper- ated and moves the toothed wheel away from the particular location to a second location at which the toothed wheel remains. Thus, rotation of the second control, member has no effect on tuning until the toothed wheel is returned to the particular location and this may be done by pulling on the second control member. The dual action required prevents unintentional changing of the preselection frequency.
237413
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