US1732146A - Secondary clock - Google Patents

Description

Oct. 15, 1929, WEBB L732J46 SECONDARY cLocK Filed Nov. 2.; 1925 4 Nader clocK 35 J9 will} 7 3y 4 l lllllllllll 36 Jzm asA FZZ Patented Oct. 15, 1929 PATENT OFFICE JAMES A. WEBB, OF CORPUS CHRISTI, TEXAS SECONDARY CLOCK Application fl led November 2, 1925. Serial No. 66,320.

My present invention has reference to a secondary clock designed to be operated in timed relation with a master clock, the improvement being especially adaptable for use in connection with moving picture machines, whereby a projecting machine in one moving picture theatre may be operated in proper timed relation with respect to that in another moving picture theatre.

To the attainment of the foregoing the invention consists in the improvement as hereinafter described and definitely claimed.

In the drawing I have illustrated a diagrammatic view of my improvement.

In the drawing a master clock is broadly indicated by the numeral 21. As the same works are employed in this clock as in those or ordinary constructions, a detail description thereof will not be entered into. A spring turned wheel 22 revolves another wheel 23. This Wheel 23 may be formed on one of the faces of a larger toothed wheel 33. Between the teeth of the wheel 33 there are inserted insulator blocks 34. Designed for intermittently contacting with the metal teeth of the wheel 33 and the insulator blocks 34 there is a spring armature or finger 35. To this spring finger or armature 35 there is attached a conductor Wire 35 and to the shaft 23 for the wheels 23 and 33 there is attached a second conductor wire 33. Both of these conductors are in circuit with a battery 34 and both of these wires 35 and 33 are connected to an electro-magnet 36.

The secondary clock is broadly indicated by the numeral 14 and the same is operated by the master clock in a manner which will now be described.

The core of the magnet 36 attracts and releases the metal arm 37 of the pallets 38 for the escapement wheel 39 of the secondary clock 14. Fixed on the shaft 39' of the escapement wheel 39 there is a pinion 50, and this pinion is in mesh with a larger pinion 51 that is journaled on a shaft 44. Fixed on one side of the pinion 51 or to the shaft 44 there is a ratchet wheel 45 and mounted for turning on the shaft 44 there is a metal bell crank lever 43. On one of the arms of the bell crank lever 43 there is pivotally connected a pawl 46 which engages with the teeth of the ratchet wheel 45. The numeral 42 designates an electro-magnet disposed opposite the second arm of the metal bell crank lever 43. This electro-magnet 42 is in circuit with a suitable battery and has one of its conductor wires connected to the pivot for the arm 37 and its second conductor wire secured to a contact element 41 which is disposed opposite a spring finger 40 that is secured on one side of the arm 43.

The toothed wheel comprising the circuit breaker 33 will, upon the rotation thereof, and as previously stated, make and break the circuit to the electro-magnet 36, the said electro-magnet 36 when energized attracts the arm 37 of the pallets 38 to bring one of said pallets out of engagement with one of the teeth of the escapement wheel 39 and the second arm in the path of engagement with another tooth. This movement brings the contact 40 into engagement with the contact 49, completing the second electric circuit and energizing the electro-magnet 42 which attracts the bell crank lever 43 and causes the pawl 46 to turn the ratchet wheel 45, and consequently turn the gear train of the auxiliary clock 14 for a predetermined distance. The two armatures are returned to initial position when the circuit is broken by ordinary means employed for this purpose, such as a spring cooperating with a fixed stop.

Having described the invention, I claim In a device for the purpose set forth, the combination with an electric circuit which includes an electro-magnet and means for intermittently energizing the circuit at timed intervals, of a clock designed to be actuated by the circuit, said clock having a revoluble toothed wheel, an escapement wheel rotated by the turning of the toothed wheel, a pivoted metal arm having pallets to engage with the teeth of the escapement wheel, disposed in close proximity and designed to be attracted by the mentioned electromagnet, a bell crank lever pivoted on the shaft of the toothed wheel and having a pivoted pawl to engage with the teeth thereof, a battery circuit having an electro-magnet therein disposed opposite and designed to attract one arm of the bell crank lever, one of the Wires of the said circuit being connected to the pivot of the metal arm, a spring finger comprising a contact on the pallet carrying arm and the second Wire of the circuit having a contact to be engaged by the spring finger when the pallet arm is attracted by the first mentioned electro-magnet.

In testimony whereof I affiX my signature.

JAMES A. WEBB.

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