US 1848625 A
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March 8, 1932. c. D. HAGER ELECTRIGAL SCREEN DOOR Filed Feb. 25, 1931 5 Sheets-sheet l Y Q W 7 g Inventor llomey March 8, 1932'. c. D. HAGER 1,848,625
ELECTRICAL SCREEN DOOR Filed Fb. 25, 1931 .5 Sheets-Sheet 2 1 n venior A llorncy March 8, 1932. C D, HAGER 1,848,625
ELECTRICAL SCREEN DOOR Filed Feb. 25, 1951 s Sheets-Sheet s F 3 Inventor v '7' A llomcy March 8, 1932; c HAGER 1,848,625
ELECTRICAL SCREEN DOOR Filed Fb, 25, 1931 5 sheets-sheet 4 e [Za7'%$p-fl2 qer Invenior A Home y ELECTRICAL SCREEN DOOR Filed Feb. 25, 1931 5 Sheets-Sheet 5 Inventor Czar/as 2 2 A Horney Patented Mar. 8, 1932 CHARLES D. HAGEB, OF CROWN POINT, NEW MEXICO ELECTRICAL SCREEN DOOR Application filed February 25, 1931. Serial no. 518,217.
This invention, relates to means for electrifying screen doors, windows or the like so as to kill flies and other insects that come into contact with the door, the general object of the invention being to so arrange the secreen in the door or window, that current can be passed over the same so as to electrify the screen with means for alternately making and breaking the circuit to the screen so that the screen will be electrified only at intervals with means for adjusting the period of time in .which the current flows to the screen.
This invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claims. i
In describing the invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which Figui'e 1 is a perspective view of a screen door constructed in accordance with this invention.
Fig. 2 is an elevation with parts in section showing the means for controlling the flow of current to the screen of the door.
Fig. 3 is a similar view showing the parts in a different position. s
Fig. 4 is a view of the slotted plug for controlling the fiow of air into and from the cylinder.
Fig. 5 is a perspective view of that side of the door which is opposite the side shown in Fig. 1.
Fig. 6 is a section on line 6- -6 of Fig. 5.
Fig. 7 is a section on line 77 of Fig 1 Fig. 8 is a section on line 8-8 of Fi Fig; 9 is a diagrammatic view of th errcuit.
a The drawings show the invention applied to a screen door, but it will of course be unde'rstoo'd that the invention can be used with a window screen or the like. In these drawings, the letter-A indicates the frame of the door and the letter B the screen thereof. This screen is composed of the secondary wires 1 and the primary wires 2, the two sets of wires I although being separated by the longitudinal members 3 which are preferably formed of waterproof material and treated linen twine. As shown, the wires 1 and 2 extend transversely across the frame with the wires 1 alternating with the wires 2.- The upper end of the Wire 1 is connected to a contact plate 4 on the top of the door and the upper end of the wire 2 is connected to a contact plate 5 on said upper end.
The lower end of the wire 1 terminates at 6 in the wooden part of the frame, while the other end of the wire 2 is formed with an extenslon 7 passing through a groove longitudinally in the door and has its upper end cono5 nected to the contact 8.
A I prefer to connect the wires to the frame in the following manner. A longitudinal groove 9 is formed in each longitudinal member of the frame on the inner face of the door with the groove extending to the inner edge of the member. Then a small groove 10 is cut in the bottom wall of the first groove. The looped ends of the secondary wire are placed in the bottom of the groove 10 and then a strip of wood 11 is placed in each groove 10 to hold"the loop portions therein.
The looped portions of the wire 2 are then placed the grooves 9 and the strip 11 in the small groove acts to insulate the secondary wire from the primary wire and a strip 12 is then placed in each groove 9 to cover the looped portions of the primary wire.
The looped portions are held in lace by stap es or the like. The looped en s of the twine are held in the end pieces of the frame inpractically the same manner.
1s laced on each face of thedoor rawings only show the guard on one face. This uard' is composed of a number of substantially yoke-shaped mem bers 13 fastened to the door, and aplurality of longitudinally arranged rods .14 which pass through the holes in the members 13, the rods being spaced apart so as to prevent any one from touching the charged screen; This guard is clearly. shown in Figs. 5 and 6.
The means for controlling the flow of current to the screenof the door are placed in A guard a casing C which can be located at'anysuitable point anl which is preferably construoted in sucha manner as to be water'- proof. This casing contains a transformerT ut of course where the device is not to. be used on the house current, then batteriesare substituted for the transformer.
A vibrator coil V'is also placed in the casing and a conductor a connects the secondary terminals of the vibrator to the contact 40f the secondary wire on the door, while the conductor b connects the primary terminal 7:. to
.- the contact 5 as is plainly shown on the drawings.
The terminal 8 on the door is connected by a conductor c'with the negative terminal of the transformer. The vibrator coil steps the current u to approximately 6,000 volts on thessecon ary line that passes through thescreem. I p
A mercury switch 14 is pivotally supported.
. intermediate its ends on abracket 15, located. 1n the casing, and a second switch 16 also of the switch 14 in closed switch 16' is so pivoted t shap mercury type is-pivoted t'o a bracket'17. A solenoid 18 is arranged in the casing between the two switches. A spring 19 tends to hold position, while the at gravity acts to hold it in open position. The tension of the spring 19 is ad usted by a set screw 20 and a set screw 21".a'cts as an adjustable stop for liniting the opening movement of the switch 1 The armature of the solenoid has a rod 21 attached thereto to the lower end of which iston 22 is fastened which operates in a Athreaded hole is formed in the bottom of the c linderto receive a threaded plug-24 which as a bore 25 passing therethrough in which is placed an upwardly movingcheck valve 26. j j The plug is provided with a Wedgeslot'2'l erem, Thus on the upwarmovement of' piston, air will pass the check valve and-enter the lower part of the cylinder through the bore 25, but on the down stroke of the piston, the check valve will close and air can only-escape slowly from the cylinder through the slot 27 By adjusting the plug,'the'escape of the air from the cylinder gulated.
can be re v v I The rod 21 carries a cross bar 28'which has acontact member 29-30 adjacent each end thereof, the contact'members being connected together by a conductor 31. Brackets 32 and 33 are fastened to the side walls of the easing under the ends'of the cross piece 28 and these brackets carry the adjusting screws '34 and 35 which when the cross piece or beam '28 is in lowered position, will engage the contacts 29 and 30. The contacts36 and 37 are connected to the brackets 38 which also support the brackets 15 and 17,-and these contacts 36-and 37 are engaged by the contacts der 23,-the cylinder and pistonforming a'dash pot 29 and 30 when the beam or cross piece 28 is in raised position. i
y A plunger 39 engages each end of the beam .or cross-piece 28 and these plungers are suit ably guided-in the brackets 38 and are normall'y pressed downwardly by the springs 40.
Thus, these springs act to hold the beam 28 and its associated parts in lowered. position while the contacts 29 and 30 engage the set screws 34 and 35. 4
A small magnet 41 is supported by one of the brackets 38 under an armature forming part 42 on the outer end of the switch 16.
Thus-when the magnet 41 is energized it will attract the part 42 so that the switch 16 will be moved to closed position.
A springfinger 43 is carried by one of the plungers 39 for engaging the switch 14 when the plunger is moved upwardly so as to move conductor 49 connects the second end of the winding of .the solenoid 18 with one end of the switch 16 and a conductor 50 connects the other end of the switch with the conductor 48.
From the foregoing, it will be seen that when the parts are in the lowered position transformer or other source of supply through conductor 44, switch 14, which is in closed "position, conductor 45, contact 35, conductor 46 and brackets 32 throughscrew 34 to contact d 29' on the beam 28 and through the conductor 31 to the contact 30. From contact 30 the current will pass through the screw 35 in the bracket 33 through conductor 47 into the ma et 41 and from this magnet, the current w as through conductor 48v to a negative terminal of the transformer.
Thus the magnet 41 is energizedso that it will move the switch 16 to closed position and or solenoid 18 and from the solenoid, the cur-. rent will pass through :the conductor 49,
shown in -Fig. 3 current will passfrom the then current will pass through the switch 14 iand conductors 45 and 45' into the magnet switch 16, conductor 50 tothe conductor 48 I the negative terminal. 4 1 p This energization of solenoid 18 will raise" the rod21 and the-piston 22 so that the beam or cross piece 28 is raised to a position where the contacts 29 and 30 thereon will engage the contacts 36 and 37. This upward movement ofthe beam 28 will also raise the plunger 39 against the action'of a spring 40 and as shown as the contacts 29 and 30 leave the screws 34 and 35, the circuit to the magnet 41 willbe broken so that the switch 16 will drop to open position.
When the contacts 29 and 30 engage the contacts 36 and 37, current will flow through the switch 14 over the conductor 45 to contact 36 through contact 26 and conductor 31 to contact 30, and through contact 37 over conw ductor 51 to the terminal 52 of the-vibrator V from which the current flows through the primary and secondary terminals of the coil to the terminals 4 and 5 on the door and thus through the secondary and primary wires of the screen.
The r primary current will then pass through the conductor 7 to the terminal 8 and back through conductor a to the negative terminal on the transformer. The spring finger 43 then opens the switch 14 against the action of the spring 19 so as to break the circuit to the screen of the door and as the current to the solenoid 18 was broken by the opening of switch 16 the parts start to slowly descend, to the first position, the downward movement being. checked by the slow escape of the air through the slot in the plug 24 which as before stated can be regulated by adjusting the plug in the threaded opening 3 in the bottom of the cylinder.
The length of time in which the current is flowing through the screen can be regulated both by the plug 24 and the screw 20 which adjusts the spring 19 which acts to close the switch. The parts can be soadjusted that the current will flow to the screen at any time between five seconds to twenty minutes,
' so that a wide duration of time in which the current flows to the screen is provided for.
When the parts reach their lowered position, the circuit is again closed to the magnet 41 by the contacts 29 and 30 on the beam 28 resting upon the screws 34 and 36, so that the operation begins over again and thus the 4 current is alternately supplied and stopped to the screen as will be seen the beam 28 with the parts attached thereto,'the screws 34 and 35 and the contacts 36 and 37 constitute a switch for controlling the flow of current to the parts electrically connected thereto.
The conductors are shown in Figure 2.
Any flies or other insects on the screen will be killed by the current passing through the wires thereof, and then when the current ceases to flow, said flies will fall from the screen.
It is thought from the foregoing description that the advantages and novel features 0 of the invention will be readily apparent.
It is to be understood that changes may be made in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the o6 scope of appended claims.
Having thus described my invention, what I claim as new is 1. In combination with a door having a screen formed of primary and secondary wires in spaced relation to each other, a vibrator coil electrically connected with said wires, a circuit including adash pot device for the wires including the coil, automatic means for alternately opening and closing the circuit, and means for adjusting the period of time the circuit remains closed including means for regulating the flow of air from the dash pot device.
2. In combination with a door having a screen formed of primary and secondar wires inspaced relation to each other, a v1- brator coil electrically connected with said wires, a circuit for the wiresincluding the coil, automatic means for alternately opening and closing the circuit, means for adjusting the period of time the circuit re mains closed, said means comprising a normally closed switch and a normally open switch, a solenoid, the circuit of which is controlled by the normally open switch, a magnet for closing said latter switch, a third switch controlling the circuit to the magnet and moved to open position when the solenoid is energized, said third-switch closing the circuit to the vibrator coil when operated by the solenoid, and means operated by the third switch for opening the first switch.
3. In combination with a door having a screen formed of primary and seconda wires in spaced relation to each other, a v1- brator coil electrically connected with said wires, a circuit for the wires including the coil, automatic means for alternately opening and closing the circuit, means for adjusting the period of time the circuit remains closed, said means comprising a normally closed switch and a normally open switch, a solenoid, the circuit of which is controlled by the normally open switch, a magnet for closing said latterswitch, a third switch controlling the circuit to the magnet and moved to open position when the solenoid is energized, said third switch closing the circuit to the vibrator coil when operated by the solenoid, and means operated by the 115 third switch for opening the first switch, and a dash pot for checking the movement to normal position of the third switch.
4. In combinationwith a screen covered frame the screen of which is formed of pri- 12o mary and secondary wires insulated from each other, a circuit connected to said wires including a vibrator coil, a normally closed switch 1n the circuit, a normally open switch in the circuit, a solenoid located between the switches and electrically connected tli'reto, a magnet for closing the second switc a third switch for closin the circuit of the magnet normally and movlng to break said circuit when the solenoid is energized,
7 said third switch closing the circuit to the the first switch when switch and a normal! switch in closed a magnet for 010 third switch 'for closing. the madgnet circuit said third 7 a switch closing the circuittothe vibrator coil vibrator coil when 0 rated by the solenoid, a dash pot connec with the third switch for checking its return movement to normal position, means for adjusting the escape of air from the dash pot, a spring-pressed p unger for moving thethird switch to normal 120- sition, a'finger on the plun%er for opemn t e unger is raised by the upward movement 0 the third switch, and an adjustable-spring for holding the first position. 1
,5. In combination with a screen covered frame the screen of which-is formedof primary and secondary wires insulated from each other, a circuit connected to said wires including a vibrator coil, a normally closed I open switch in the circuit, a solenoid ocatedbetween the switches and electricallyconnected thereto, the second switch, a
when the solenoid is de-energize when operated b tlie solenoid, a dash pot connected with e third switchfor checkn its ur movement'to normal Position,
means for adjusting the escape of air from the dash pot, a spring-pressed plunger for moving the third switch to normal- -positiop,
a r on the plun er for opening the fir'st.
switc 'when'the p anger is raised by the upward movement of the third switch, an adjustable spring for holdinmeswitch; said and second in closed POSItIOII, switches being of the mercury type, i I
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