US2045285A - Burglar alarm - Google Patents

Description

June 23, 1936.; K. SPRING ET AL, 2,045,285

BURGLAR ALARM Filed Dec. 3, 1954 2 Sheets-Sheet 1 J 1' 9: E Kmscl-lror 5P/f/NG JACK .SPR/NG 2 v INVENTORS ATT NEY June 23, 1936.

K. SPRING ET AL BURGLAR ALARM Filed Dec. 5, 1954 2 Sheets-Sheet 2 4 x 8 4V a w A KRISCH TOF SPRING JhcK PRl/va IN VEN TOR S ORNE) Patented June 23, 1936 UNITED STATES BURGLAR ALARM Krischtof Spring and Jack Spring, Portland, Oreg.

Application December 3, 1934, Serial No. 755,677

1 Claim.

Our present invention relates to our pending application filed in the United States Patent Office under date of September 27 1934, in Division 42, Serial No. 745,710, upon improvements in Burglar alarms.

Our present invention is comprised primarily of a base having an electric prime mover disposed thereupon and which has a speed reducer directly secured to the armature shaft thereof. The speed reducer is indirectly attached to a gun having a plurality of firing cylinders associated therewith.

A pair of parallelly disposed shafts are mounted upon the base. One of the shafts is adapted to be driven through a train of gears by the prime mover. One of the shafts is threaded. A split trip timing device is placeable in desired placement upon the threaded shaft and is adapted to be moved longitudinally of the respective shafts as the threaded shaft is rotated. An electric switch is disposed in the line of travel of the split trip timing device and is adapted to be actuated as a stop carried by the split trip timing device engages the Same. The number of shots to be fired by the gun is predetermined by the set position of the split trip timing device. The electric motor is energized through an electric current conducted thereto through suitable electric conduits and the motor is energized at one or more places by remote control. The primary purpose and object of our present invention is similar to that of our present pending application. A further object of our present invention consists in providing a simplified settable device for predetermining the number of shots that are to be fired by the gun. A still further object of our present invention consists in so constructing the device that the electric circuit is broken at the conclusion of each firing cycle and a still further object of our invention consists in so constructing and assembling the device that the same may be actuated from a remote control station or stations.

With these and incidental objects in view, the invention consists in certain novel features of construction and combination of parts, the essential elements of which are set forth in the appended claim, and a preferred form of embodiment of which is hereinafter shown with reference to the drawings which accompany and form a part of this specification.

In the drawings:

Fig. 1 is a perspective end view of the base upon which is mounted the prime mover, the speed reducer, the gun, the parallel shafts, the split trip timing device and the switch that is to be actuated thereby.

Fig. 2 is a fragmentary top plan view of the motor, the speed reducer and the actuator of the gun.

Fig. 3 is a view of the split trip timing device.

Fig. 4 is a fragmentary side view partially in section of the trip end of the base illustrating the split trip timing device-in front elevation and illustrating the trip carried thereby as having broken the electric circuit of the switches disposed in alignment with th( travel of the trip.

Fig. 5 is a perspective end view of one of the remote control switches that is intended for being tripped by the foot of the user of our device.

Fig. 6 and Fig. 7 are sectional end view layouts of the electric control wiring circuit to be used in conjunction with our device.

Like reference characters refer to like parts throughout the several views.

We mount our present invention upon a base I.

The base I is made in the form of a rectangular box with the top 2 of the box being raised above the bottom edge 3 in order that the electric connection may be disposed therein and below the top and within the side and end walls of the same. An electric motor 4 is disposed upon the top side of one end of the base and the same is connected to electric conduits there shown. that lead to a source of electric energy for energizing the same. The train of gears here shown as two in number connect the armature shaft 5 with a threaded shaft 1. A second shaft 8 runs parallel with the threaded shaft I and these respective shafts are journaled within end brackets 9 and I0. 5 A split trip timing device as illustrated in Fig. 3 is adjustably positionable upon the respective shafts. A threaded portion I I is formed adjacent one end of the timing device that is adapted to engage and coact with the thread I2 disposed upon the shaft I. The split trip timing device is comprised of two sections I3 and I4. Split sleeve members I5 and I6 are disposed adjacent the upper end of the two members I3 and I4 and. this split journal bearing is adapted to engage and precisely rest upon the shaft 8 and to be moved longitudinally thereof. The split members I3 and I4 are secured together on their one end and are hinged about a hinge pin I'I through the use of coacting bars. I8 and that are disposed at the oppositely disposed sides of the two members and that are secured to the bar section I3. The lower ends of the respective split trip are beveled as illustrated at I9 and 20 to permit the same to be hinged efficiently to facilitate their engaging the respective shafts l and 8. The upper ends of the bar sections l3 and I4 are recessed as illustrated at 2i and 22 to permit the locking screw 23 being placed therein that is used for clamping the same together through the use of the thumb nut 24. The screw 23 is hinged to the bar section I3 by a hinge pin 25. A trip 26 is secured to one of the side bar sections l3 and I4 and a hole 21 is disposed within the bracket l0 and through which the trip 26 may be made to pass as the same is in registered alignment therewith. An electric switch 28 is disposed adjacent the end bracket ill and electric conductors 29 and 30 pass electric current therethrough. The trip 26 travels and is adapted for being placed in registered engagement with the switch and breaking the circuit as illustrated in Fig. 4. A pointer 3| is carried by the split trip timing device and a graduated strip 38 is placed upon the base and contiguous to the line of travel of the pointer 3|. Graduations 33 are disposed upon the graduated strip. A gun 34 of the revolver type is secured to the base I. The shaft 35 of the speed reducer carries an arm 36 and as the shaft 35 is rotated, the arm 36 is rotated. The arm 36 carries a journal 31 that passes therethrough and as rotary motion is imparted to the shaft 35 and to. the arm 36 a reciprocating motion is imparted to the link 38, that is secured to the shaft 31. A precise positioning of the link 38 relative to the arm 36 may be made by threading the link 38 at its one end as illustrated at 39; and having a threaded positioning lock 4!) that is secured to the shaft 31. When the desired placement of the link 38 is accomplished, the same may be locked relative to the link by lock nuts 4| and 42. A trip arm 43 is carried by the link 38 and the same may be made to engage the trigger 44 of the gun 34. At each rotation of the speed reducer shaft 35 the trigger 44 of the gun is actuated into and out of firing position and fires the revolver at each revolution. The distance between the graduations 33 represents the travel of the split trip timing device for one revolution of the speed reducing shaft 35, and therefore if it is desired to fire the gun but once at each energization of the motor 4 the pointer 3| would be placed on graduation l, whereas if the gun is desired to be fired six times the pointer 3| would be placed on the graduation 6 and therefore before the circuit is broken by the trip 26 engaging in the switch 28 and breaking the electric circuit therein six revolutions of the speed reducing shaft 35 will occur and the gun will have been fired six times. A plurality of manually manipulative switches may be placed within the electric circuit leading to the electric motor and upon the manual manipulation of each of these switches, the circuit will be closed and the electric motor will be energized and the number of shots fired by the gun upon the energization of each or any one of the switches depend upon the set position of the split trip timing device. The switches may be placed within or at any suitable location. They may be placed within a box 45. The box 45 has a door 46 that is normally maintained closed by a spring latch 41 disposed in registered alignment with the switch 36. The switch 48 is normally maintained as an open switch by the coil spring 49 and when the door 46 is manipulated by the hand or toe of the user of the device the electric circuit is closed and the electric motor will be energized for the time required to move the split trip timing device from where it is set until the electric circuit is broken by the trip 26.

I have illustrated in Fig. 7 a diagrammatic layout of the electric circuits. In this view the electric conduits 50 and 5! lead to a source of electric supply not here shown. The electric motor 4 is disposed within the circuit. In the installation of the device, a master switch 54 is placed preferably adjacent the door or other exit from which the occupants of the building normally leave or normally enter the building depending upon whether the burglar alarm is to be used as a clay alarm or as a night alarm. A time switch 55 is placed in the circuit and is normally closed, being opened only at the time the gun has fired the number of shots it is set to fire, and a plurality of manually manipulative switches here shown as two in number at 56 and 5! are disposed within the circuit. When the master switch is closed and the time switch is closed, the manipulation of any one or all of the remaining manually manipulative switches, here shown at 56 and 5?, are manually closed, the electric circuit would become a closed circuit and the electric motor 53 would be energized.

While the form of mechanism herein shown and described, is admirably adapted to fulfill the objects primarily stated, it is to be understood that it is not intended to confine the invention to the embodiment herein shown and described, as it is susceptible of embodiment in various forms, all coming within the scope of the claim which follows.

What we claim is:

In a device of the class described. a support, a firearm of the repeating type, in which a pull on the trigger fires a single shot, mounted on said support, an electric motor mounted on said support, means operated by the motor for pulling the trigger a plurality of times in succession, a circuit including said motor and a switch in said circuit adapted to remain closed on being closed, a normally closed second switch in said circuit, means operated in synchronism with the motor operated means for opening the second switch, including means for adjusting the length of time the motor operates to control the number of shots fired.

KRISCHTOF SPRING. JACK SPRING.

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