Auto alarm system

An alarm system for a vehicle is disclosed. The alarm system is responsive to theft of the vehicle either by pulling the lock mechanism or by starting of the vehicle through the forced entry of the bowl plate. The alarm system further includes a signal system remote from the detection system for emitting a single frequency for detection remote from the vehicle. The detector may include distance and direction detection from the detector to the vehicle.

TECHNICAL FIELD 
This invention relates to silent vehicle alarm systems and more 
particularly to silent alarm systems for vehicle theft through the act of 
starting the vehicle. 
BACKGROUND ART 
There are many appraoches taught in the prior art for vehicle theft 
detection devices. Many of these systems use some sort of transmitting 
system. See, for example, U.S. Pat. No. 4,012,728 to Fowler; U.S. Pat. No. 
4,319,230 to Fowler, et al.; U.S. Pat. No. 3,665,312, to Jarvis; U.S. Pat. 
No. 4,187,497 to Howell et al; U.S. Pat. No. 3,357,020 to Slifer, Jr.; 
U.S. Pat. No. 4,177,466, to Reagan; and U.S. Pat. No. 3,357,020 to Slifer, 
Jr.; U.S. Pat. No. 4,177,466, to Reagan; and U.S. Pat. No. 4,188,614 to 
Habib et al. Many of these, such as Fowler, Jarvis and Howell use a 
mechanism for detecting the theft of the device. For example, Fowler 
discloses a burglar alarm system which utilizes an electric back-up 
circuit. When the electrical conductor of the burglar alarm system is cut, 
a lock-in relay is operated to close the back-up circuit and actuate a 
radio transmitter to transmit radio signals to a receiver that indicated 
that an electrical conductor of the burglar alarm has been cut. Jarvis 
discloses an alarm and monitoring system for a vehicle in which a 
transmitter is activated upon illegal entry into, or theft of, the 
vehicle. The transmitter sends out a coded signal which identifies the 
vehicle. The signal is sent out sequentially on different frequencies with 
a predetermined and different time interval between each transmission. The 
received signals are utilized to locate the vehicle by triangulation 
techniques. Howell et al discloses a portable vehicle alarm system having 
a motion sensitive switch in a transmitter for transmitting an alarm to a 
remote receiver. The receiver is capable of several functions, including 
silent alarm to police or security guards, as well as visual and audible 
signals at remote locations. Further, U.S. Pat. No. 1,239,602 to Johnston, 
shows a steering shaft with a special protective housing constructed to 
include sounding an alarm if the housing is disturbed, but fails to show 
any alarm system responsive to tampering with the starting mechanism of 
the vehicle. U.S. Pat. No. 4,449,605, to Read shows a system associated 
with starting the vehicle after partially destroying the starting 
mechanism, which system prevents car movement and therefore has no alarm 
nor suggests an alarm. Also, the Read system is actuated by starting the 
vehicle rather than by the removal of a portion of the starting mechanism. 
U.S. Pat. No. 3,629,818, to Yokohama, et al. shows a dual test alarm 
system for the open door of the vehicle with the steering shaft unlocked 
and does not disclose an alarm intrusive to the starting mechanism with 
the door closed. In addition, Habib et al discloses a remote alarm system 
for preventing of motorcycles, bikes or other similar devices from theft. 
The alarm system includes a housing which is positioned on a support 
surface for cooperative engagement with a wheel of the vehicle. 
Many other techniques have also been discovered for prevention of theft. 
For example, see U.S. Pat. No. 3,947,693, to Eskenas. Eskenas discloses an 
electrical pushbutton ignition combination lock wired into the electrical 
circuit of the motor of the vehicle. The proper combination of buttons 
must be pushed to energize a relay to complete the ignition circuit. 
Pressing any of the other buttons simply grounds the circuit and disables 
the unlocking mechanism. 
However, none of the above-referenced prior art discloses a system 
specifically adapted to respond to the removal of the lock cylinder in the 
steering column or steering column intrusive starting techniques, despite 
the fact that most thefts involving vehicles result from a removal of the 
lock mechanisms from the steering column or breaking into steering columns 
that have no special locks. In addition, most signal devices of the prior 
art are very complex and not easily adapted to present police procedures. 
It is an object of the present invention to teach apparatus that responds 
to the removal of an ignition lock to cause a silent alarm, or audible if 
required, to respond to the event. 
It is a further object of the present invention to teach apparatus for 
signaling the presence of a stolen vehicle to policemen in the vicinity. 
DISCLOSURE OF THE INVENTION 
A silent alarm system and apparatus for a response to the removal of the 
lock cylinder or for a response to the starting of the vehicle by breaking 
through the bowl plate and manually starting the vehicle from a steering 
column is disclosed. The system is partially mounted into the interior of 
the steering column and is spring loaded against the lock mechanism of the 
steering column. Upon activation by removal of the lock cylinder or manual 
starting of the vehicle through the bowl plate of the steering column 
mechanism, a mechanical linkage to the activating switch of the alarm 
system would melt. This linkage, when released, would force the completion 
of an electrical circuit to a high frequency radio signal unit. A patrol 
car through a remote detection unit in the nearby vicinity could then 
detect the signal of the stolen vehicle through a remote detection unit. 
Because the system could be hidden in the vehicle, it would be difficult 
to find and would give the patrolman an opportunity to pick it up on the 
remote unit.

PREFERRED MODE FOR CARRYING OUT THE INVENTION 
Referring to FIGS. 1 and 5, there is shown the detection mechanism 1 of the 
present invention. The detection mechanism 1 is located at the lower turn 
signal housing 6 of a vehicle (not shown) and is mounted with screw 4 and 
bearing assembly 9 to secure mechanism 1 in a fixed position. Mechanism 1 
abuts lock cylinder 5 and is housed in a contact mechanism box 10. 
Mechanism box 10 is mounted in the rear of lock mechanism 5 through oval 
mounting bracket 70 by use of a metal bar 3. The metal bar 3 is mounted to 
bearing assembly 9 (FIGS. 1, 2, 5) of steering shaft 8 under a turn signal 
mounting plate 400 which is under the steering wheel locking plate 300. 
The bearing assembly 9 prevents rotation of the bar 3. Screw 4 holds metal 
bar 3 to the bottom of turn signal mounting plate 400. Oval mounting 
bracket 70 is mounted to metal bar 3 by screws 7. A projector rod 80 is 
mounted in a bowl plate 75 with mechanical finger 301 to secure the 
steering wheel locking plate 300 in the lock position. A thief breaking in 
bowl plate 75 would apply upward force to a rack 21 or projector rod 80, 
or both, by a screwdriver 2 or other mechanism to unlock steering wheel 
locking palte 300 and engage the ignition to steal the vehicle (not 
shown). 
As shown in FIG. 5, the bowl plate 75 is a protective cover mounted to the 
lower lock cylinder housing 310 to protect projector 80 and rack 21. Plate 
75 is constructed of plastic or light gauge metal which is easily broken. 
Accordingly, mechanism 1 is designed to prevent starting the engine (not 
shown) with the projector rod 80 after breaking into bowl plate 75 and 
forcing upward travel at projector rod 80 by screwdriver 2 or by pulling 
lock mechanism 5 by reacting to these intrusions to set off the alarm. 
The activation of the alarm mechanism by movement of projector rod 80 is 
accomplished by supplying adjustable brackets 55, 56 affixed to box 10 
which bear contacts 45, 40, respectively, thereon. Contact 45 is mounted 
in a position juxtaposed to projector rod 80. Projector rod 80 is mounted 
such that adjustable contact bracket 55 is adjusted to the highest point 
that the projector rod 80 can attain when in the starting position normal 
for the vehicle (not shown), plus a 1/32 inch clearance between contact 
45, 40. In this manner, any time projector rod 80 is forced beyond its 
normal travel, contact 45 mates to contact 40 with the upward force on 
projector rod 80 by the screwdriver 2 or other mechanism. 
Each of contacts 40, 45 has a contact wire 60, 65, respectively, engaging 
other parts of the system. As shown in FIG. 7, contact wire 60 engages the 
positive side 170 of the battery 120. Cotact wire 65 engages the negative 
side 35 of the signal fuse or belfuse 85 located in an activation box 175 
(FIG. 3). 
As shown in FIGS. 1 and 2, should the lock cylinder 5 be pulled instead of 
tampering with projector rod 80 inside bowl plate 75, spring 15 is 
provided to abut at one end box 10. The other end of spring 15 is in 
contact with activating spring seat 180 mounted on metal bar 3. In 
addition, a set of brackets 22, 23 are provided, one of the brackets 23 
affixed to box 10 and the other bracket 22 affixed to bar 3. Each of the 
brackets 22, 23 holds one of the contacts 20, 25, respectively, in 
juxtaposed relationship with an approximate 1/32 to 1/64 inch clearance 
between contacts 20, 25. Should lock mechanism 5 be removed or pulled, 
spring 15 will force sufficient movement of box 10 relative to bar 3 with 
screws 7 permitting movement of box 10 using the width of the slots in 
which screws 7 are mounted to permit contacts 20, 25 to meet. 
The contact 25 is connected to the positive side 170 of battery 120, and 
contact 20 is connected to the negative side 35 of the signal fuse 85 
located in an activation box 175 (FIGS. 3,7). Activation box 175 may be 
located anywhere in the vehicle (not shown) and would usually be placed in 
a non-accessible area of the vehicle. 
As shown in FIG. 3, activator box 175 includes a fuse holder 90 having a 
signal fuse 85. Fuse 85 is made up of, for example, a one amp belfuse and 
is capable of melting at relatively low temperatures. As discussed above 
and shown in FIG. 7, wire 65 is connected to one side 35 of fuse 85. The 
other side of fuse 85 is connected to a unit contact 100. As shown in FIG. 
3, unit contact 100 is mounted to a flexible bracket 14 and physically 
separated from fuse holder 90. A spring 95 is located between fuse holder 
90 and unit contact 100 to maintain the tension of the fuse wire 85 which 
physically holds back spring 95 from expansion. Mounting bracket 14 is 
connected to the ground 105 of the car battery 120. Juxtaposed with 
contact 100 is contact 150 mounted on rubber insulator and bracket 110 to 
insulate contact 150 from ground 105. Contact 150 is fixed in position and 
connected to the negative side 145 of transmitter power supply/transmitter 
155. The positive side 130 of the battery 120 is connected to positive 
terminal 135 of transmitter power supply/transmitter 155 at all times. 
As shown in FIG. 6, the fuse holder 90 includes a hook 305 securing one end 
at the fuse wire 85. The other end of fuse wire 85 is routed through a 
hole 306, such as a 1/16 inch hole in a spring seat 91 at holder 90. From 
hole 306, the other end of fuse wire 85 is attached to a hook 307 on 
flexible bracket 14. The expansion length of spring 95 positioned against 
seat 91 allows contacts 100, 150 to mate upon release of flexible bracket 
14 by fuse wire 85. A reset switch 115 (FIGS. 3, 7) would be used to turn 
off the transmitter 155 after the unit has been recaptured from the theft. 
The reset switch 115 performs its function by shutting off power from the 
twelve volt battery 120. 
As shown in FIG. 4, a detection meter such as a radio altimeter 164 is 
mounted by mounting bracket 195 in a police patrol car (not shown). The 
receiver 160 has a warning light 200 to indicate the presence and 
closeness of a stolen car. If several cars approach, the car distance can 
be determined from the frequency by a radio altimeter 164 and the vehicle 
located by a direction finder such as a portable radio compass 165. 
Triangulation may be used to locate the particular vehicle. The meter 164 
has a short range receiver 160, such as Archer mobile alert mod. no. 
49-491A. 
In operation, when the lock cylinder 5 is removed during the act of theft, 
the contacts 20, 25 are interconnected, thereby completing a circuit with 
regard to fuse wire 85. A similar contact make-up of contacts 40, 45 would 
occur if the bowl plate 75 were broken into and projector rod 80 pushed 
upward. With current flowing through fuse wire 85, the fuse wire 85 will 
melt, thereby releasing spring 95 so that contact 100 comes into contact 
with contact 150, thereby keying transmitter 155. Transmitter 155 would 
then cause a unique frequency to be emitted by the vehicle so long as the 
battery 120 was connected with power supply 155. A patrolman cruising 
would be able to determine by warning light 200 that a vehicle that has 
been stolen was approaching and could then, by use of radio compass 165, 
determine which approaching car had been stolen if there were multiple 
cars in the vicinity. 
Because many varying and different embodiments may be made within the scope 
of the inventive concept herein taught including equivalent structures or 
materials hereinafter thought of, and because many modifications may be 
made in the embodiments herein detailed in accordance with the descriptive 
requirements of the law, it is to be understood that the details herein 
are to be interpreted as illustrative and not in a limiting sense.