US 796241 A
Description (OCR text may contain errors)
Unirse etarras' .arrasa marion.
`ALBERT DY MCNAIR, OF DALLAS, TEXAS.
Specification of Letters Patent.
Patented Aug. 1, 1905.
Application led November 4, 1904. Serial No. 231,420.
T0 all whom 7115 777,/1/7/ concern:
Be it known that I, ALBERT DY MCNAIR,
a citizen of the United States, and a resident of i exciting the wires of the fence electrically, so
as to give the animals the sensation of pain upon making proper contact with the wires. My invention also relates to time-controlled mechanism for'rendering the electric action of the fence intermittent, so as to save the battery-current.
Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures..
Figure 1 is a diagrammatic side elevation showing a fence energized by one form of my invention. Fig. 2 is a diagrammatic representation oi' another t'orm of my invention, in which the wiring connections are somewhat different; and Fig'. Sis a side elevation ot' the time-controlled mechanism for rendering the action of the interrupter intermittent.
An induction -coil 3, preferably a small Ruhmkorfi' coil, is provided with an interrupter 4 and with primary and secondary windings 5 6, these parts being ot' the usual construction. Mounted upon a board 7 is a clock 8, provided with a contact-wheel 9, adapted to rotate several times per minute. Upon the periphery oi' this wheel are contact-pins 10, adapted to successively close a contact 11. rlhe primary winding 5 of the coil is connected by a wire 14 with a battery 12, the latter being connected by a wire 13 with the contact 11. The terminals of the secondary winding 6 are respectively connected with distributing-wires 15 16, the distributingwire 15 being connected with certain fencewires 17 and the distributing-wire 16 being similarly connected with the remaining fencewires 18, so that the wires of opposite polarity are disposed alternately, as indicated by the arrows in Fig. 1. By this means any two successive wires 17 18 when energized have lthrough the fence.
opposite polarity, and when the body of an animal comes into engagement with both `of these wires, the coils being in action, the animal receives a shock from the electric current, and is thus prevented from passing The wires 1718 are supported upon fence-posts 19.
In the form shown in Fig. 2 the terminals otl the secondary winding' are respectively connected with a ground-wire 22 and a distributing-wire 23, this distributing-wire being connected with all oil the fence-wires 21, which are supported upon posts 20. With this form of the device the alternating currents generated in the secondary winding are caused to flow in parallel through the fencewires, the latter having sufficient static capacity to enable the reversals to take place. The reversals are practically simultaneous in all of the wires shown in this figure.
r1`he otiice of the clockwork is to save battery-power, which it does by throwing the primary circuit out of action. v-For instance, if the clockwork closes the contact` 11 at the rate of fteen times per minute and upon each closure of the circuit the interrupter is allowed to vibrate for one-fourth ot' a second, the device is about as effective in preventing the escape of cattle as when the interrupter acts continuously.
The invention is used as follows: A fence of either type described having been erected, the clockwork is set in motion. Each time a contact-pin closes the contact 11 the current passes from the battery 12 through the primary winding and is continuously broken by the interrupter 4. By the action of the primary winding alternating currents are induced in the secondary` winding, and these alternating currents energize the fence-wires 17 18. At the moment when any particular wire, such as 17, is energized in one sense the wire 18 immediately adjacent is energized in the opposite sense, the reversals in the direction taking place in all of the wires at practically the same moment.
Vhile in the form indicated in Fig. 1 the circuit is completed from one wire to another 'wire by the body of the animal endeavoring to pass through the fence, in Fig. 2 the cir'- cuit is completed by the animal standing on the ground and coming into contact with any one of the wires, the currents passing through the body of the animal to the ground, or vice versa.
ary winding, a circuit for energizing said pri-4 mary winding, said circuit being provided with a Contact, and time-controlled mechanism for throwing seid primary winding` into and out of circuit.
In testimony whereof l have signed my name to this speciiication in the presence of two subscribing` witnesses.
ALBERT DY MCNAIR.
WV. L. HALL, W. H. FLIPPEN.