Lock for vehicle hood release for theft prevention

A lock for a vehicle hood release prevents theft of the vehicle by being heavily armored and having a housing which is secured to a frame member within a vehicle with device cables protected by an armored tube passing from the passenger compartment, through the firewall and into the engine housing of the vehicle--with an appropriate switch wire or switch wires capable of reentering the passenger compartment from the engine housing by passing through the firewall to a switch or switches in the passenger compartment of the vehicle hidden at a plurality of secretive points.

BACKGROUND OF THE INVENTION 
This invention relates to a device for preventing the theft of motor 
vehicles and more particularly to a lock for a vehicle hood release which 
also disables the ignition coil or starter relay of a motor vehicle. 
Vehicle theft in the United States is such a big business that even 
organized crime is involved. Vehicles are even stolen to order. Because of 
these developments, a vehicle owner is constantly on the alert for a 
device which can protect the vehicle. 
Some vehicles are extremely susceptible to being stolen. These vehicles are 
generally in the sports or luxury classes. Within the sports class are the 
four-wheel drive vehicles and sports automobiles. Typical of the sports 
automobiles is the Corvette by Chevrolet. The Corvette is such a popular 
vehicle, that clubs, having membership restricted to Corvette owners, 
exist from coast to coast in the United States. 
Unfortunately, the Corvette is also a very popular vehicle with thieves. In 
fact, the Corvette has one of the highest rates of being stolen in 
comparison to other car models. This rate of stealing leads to higher 
insurance rates and a substantial increase in the cost of ownership. A 
stolen vehicle is also a great inconvenience for the owner. For these 
reasons and other reasons, Corvette owners take great pains to protect 
their vehicles. 
The key factor in vehicle theft is time. The more quickly a thief can get 
the vehicle started and moving, the safer a thief can feel. The main 
purpose of any antitheft device is to cause the thief to spend such a 
substantial amount of time in the vehicle that it is dangerous for the 
thief to remain long enough near the immobile vehicle in his attempt to 
steal the vehicle. If given enough time, a thief can overcome almost any 
antitheft device. 
In response to this market for devices which prevent or delay vehicle 
theft, many devices to protect these vehicles are available in the art. In 
particular, these devices are centered around locking the hood and 
disabling the ignition so that the vehicle cannot be started. Locking of 
the hood prevents an ignition bypass. Shorting of the ignition prevents 
starting of the vehicle even if the ignition switch is pulled. So it is 
clear that these devices have a use in prevention of vehicle theft. 
The combination hood locking and ignition disabling devices suffer from 
certain problems. First, a resourceful thief can bypass some of these 
devices. Second, that same thief can merely break off the device and 
rupture the mechanism used. The thief can also use other methods 
completing his illegal task. 
Also the vehicle owner can have problems with the combination device which 
locks the hood and disables the ignition. Such a device must be easy to 
set, easy to release and difficult for a thief to bypass. These features 
are, at the same time, desirable and contradictory. The features are 
desirable in that the vehicle is made harder to steal. The features are 
contradictory because ease of setting and ease of release imply that a 
thief can easily bypass the device. 
It may also be inconvenient for a vehicle to have such a device on the 
vehicle--especially when the vehicle is left in a valet parking lot. If 
the device is set with the ignition disabled out, the valet cannot start 
the vehicle with the key. If the device is not set, access under the hood 
can be obtained with the resulting loss of the battery or other essential 
equipment. Thus valet parking can require that the device not be set. The 
device then becomes useless, unless the hood can be locked without 
disabling the ignition. 
A Corvette hood generally opens from the rear by the windshield as opposed 
to the front opening of most vehicles. This feature can cause problems 
with the design of a lock for a hood release, for it is sometimes 
desirable to leave a lock for a hood release unlocked but have the hood 
remain secured. If a suitable lock for a hood release can be developed, it 
must be capable of use as desired. For example, it must be capable of 
being set, unset with the hood secured (for example, when the hood is to 
be used frequently), or unset with the hood unsecured or open. In this 
fashion, both convenience and safety can be provided if desired. 
The various models of Corvette require adaptations for a hood release lock 
in order to permit a one style of hood release lock to fit various models. 
Such adaptations must be made without weakening the protective 
capabilities of the device. Such features may well be contradictory due to 
the desirable quality of such adaptation on the one hand; and the chance 
of the adaptation permitting the device to be more easily bypassed. 
Thus, a device for preventing theft of a vehicle, or at least makes the 
vehicle more difficult to steal is of great advantage to the art. 
SUMMARY OF THE INVENTION 
Therefore, it is an object of this invention to provide a device which can 
delay a vehicle thief. 
A further object of this invention to provide a device for preventing or 
delaying vehicle theft which is difficult to bypass. 
A still further object of this invention is to provide a device for 
preventing or delaying vehicle theft which secures the vehicle hood 
release. 
Yet a further object of this invention is to provide a device for 
preventing or delaying vehicle theft which disables the ignition or 
starter. 
Also an object of this invention is to provide a device for preventing or 
delaying vehicle theft which independently secures the hood release 
without disabling the ignition or starter. 
Another object of this invention is to provide a device for preventing or 
delaying vehicle theft which is easily set. 
Still another object of this invention is to provide a device for 
preventing or delaying vehicle theft which is easily released. 
Yet another object of this invention to provide a device for preventing or 
delaying vehicle theft which is selectively operated. 
A further object of this invention is to provide a device for preventing or 
delaying vehicle theft which is adaptable to various vehicle models 
without weakening the device. 
These and other objects of this invention (which other objects become clear 
upon consideration of the specification as a whole) are met by providing a 
device which is secured to a frame member within a vehicle with device 
cables protected by an armored tube passing through the firewall of the 
vehicle with an appropriate switch or switches capable of reentering the 
firewall into the passenger compartment of the vehicle at a plurality of 
secretive points.

DESCRIPTION OF THE PREFERRED EMBODIMENTS 
A hood release lock provides for disabling of the ignition and locking of 
the hood, while at the same time being releasable without the use of a 
key. In this manner, a vehicle owner may prevent or at least delay theft 
of the vehicle. 
Referring now to FIG. I, hood release lock 10 of this invention is shown as 
being mounted and connected to a hood release 11 of hood 11a in a vehicle 
12. Mounting is accomplished by bolting or otherwise securing an armored 
housing 20 to the frame of vehicle 12 on the driver's side of the vehicle 
12 in front of the driver's side door. Ignition wire 62, switch wire 64, 
and latch release 88 are contained within armored tube 66 between firewall 
17 of vehicle 12 and housing 20 of hood release lock 10. Ignition wire 62 
is connected at the other end thereof to ignition 19. Switch wire 64 is 
connected at the other end thereof to switch 18. Switch 18 can be 
concealed at innumerable places within the passenger compartment 13 of the 
vehicle 12. Thus all wires are armor protected. Because it passes through 
the firewall 17 into engine housing 15 and is concealed by hood 11a, and 
from engine housing 15 back into the passenger compartment 13 of the 
vehicle 12, the location and use of switch wire 64 is protected. 
Referring now to FIG. II, a perspective view of housing 20 of hood release 
lock 10 is shown from handle end 22. On handle end 22 is grip 72 of handle 
assembly 70. Above grip 72 and within handle end 22 is a red light 
emitting diode 110. When hood release lock 10 is in set position 14 (shown 
in FIG. III) red light emitting diode 110 is lit. Set position 14 locks 
the hood release 11 and disables the ignition 19. When hood release lock 
10 is in unset position 16 (shown in FIG. IV), the vehicle 12 is 
startable. 
FIGS. III and IV are cross-sections of FIG. II along the Section Line 2--2. 
FIG. III depicts set position 14 of hood release lock 10. FIG. IV depicts 
unset position 16 of hood release lock 10. By this cross-section, handle 
end 22 of housing 20 is shown to be oppositely disposed from cable end 24. 
Within housing 20 are a plurality of chambers. Handle chamber 26 slideably 
receives handle assembly 70. Detent chamber 28 receives detent assembly 
29. Solenoid chamber 50 receives solenoid 52. Armature chamber 58 is 
adjacent solenoid chamber 50 and receives armature 56. Latch activation 
chamber 80 receives latch release assembly 81. 
Latch release assembly 81 has three basic positions. In set position 14, 
the starter or ignition is disabled, so that the vehicle cannot start; and 
the hood release lock 10 has rendered the hood 11a unopenable. In unset 
position 16, the vehicle can be started and driven, because hood 11a is 
still secured. In released position 16a (shown more clearly in FIG. XI), 
hood latch 212 is released, and hood 11a may be raised. 
Detent chamber 28 has its vertical axis substantially perpendicular to the 
horizontal axis of handle chamber 26. Within and at one end of detent 
chamber 28 is ball end 30. Ball end 30 is also adjacent handle chamber 26. 
Situated at ball end 30 is ballbearing 32 slideably mounted within detent 
chamber 28. 
Adjacent ballbearing 32 and within detent chamber 28 is detent block 34. 
Spring end 36 in detent chamber 28 is oppositely disposed from ball end 30 
and has spring 38 secured thereto. In this manner, detent block 34 is 
spring-loaded in detent chamber 28. Within detent block 34 is a locking 
aperture 40. Locking aperture 40 is used when hood release lock 10 is in 
set position 14. 
Solenoid chamber 50 has its horizontal axis perpendicular to the vertical 
axis of detent chamber 28. Solenoid chamber 50 contains solenoid 52. 
Solenoid 52 includes solenoid body 54 with solenoid armature 56 slideably 
mounted therein. Solenoid armature 56 is slideably mounted within armature 
chamber 58. Armature chamber 58 communicates with both detent chamber 28 
and solenoid chamber 50. In this manner, solenoid armature 56 may slide 
through armature chamber 58 and into locking aperture 40 when hood release 
lock 10 is in set position 14. Solenoid 52 may be a read switching 
solenoid. 
Solenoid chamber 50 has an armature end 59 adjacent armature chamber 58 and 
connection end 60 oppositely disposed therefrom. At connection end 60, 
ignition wire 62 and switch wire 64 are electrically connected to solenoid 
52. Switch wire 64 may be a two lead wire to power diodes and activate the 
solenoid. The other end of ignition wire 62 is connected to the ignition 
19 of vehicle 12. With hood latch device 10 in set position 14, solenoid 
armature 56 is in locking aperture 40 which results in the disabling of 
the ignition 19 so vehicle 12 cannot be started. 
The other end of switch wire 64 is operatively connected to switch 18. 
Operation of switch 18 can release hood release lock 10. Because armored 
tube 66 is secured to cable end 24 of housing 20 in an armored fashion and 
extends through the firewall 17 of vehicle with ignition wire 62, switch 
wire 64, and latch wire 88 contained therein, it is both difficult and 
time consuming to foil hood release lock 10. Because switch wire 64 does 
not appear within the passenger compartment 13 of vehicle 12, switch 18 
can be concealed in such a plethora of places within the passenger 
compartment 13 so that switch 18 is extremely difficult--if not impossible 
to find--unless the person knows where it is. 
The relative position of handle assembly 70 determines whether the hood 
release lock 10 is in set position 14 or unset position 16. Handle 
assembly 70 is slideably mounted within handle chamber 26. Handle assembly 
70 includes handle 71. Handle 71 includes a grip 72 and an actuator 74. 
Actuator 74 has a grip end 76 adjacent grip 72 and is slideably mounted 
within handle chamber 26. Grip 72 is used to change hoodlatching device 10 
from set position 14 to unset position 16 and the reverse procedure. At 
the end of actuator 74 opposite grip end 76 is a latch activation chamber 
80. Between the latch activation chamber 80 and grip end 76 is ball 
receiver 82. Ball receiver 82 receives ballbearing 32 when hoodlock device 
10 is in set position 14. 
Slideably mounted within latch activation chamber 80 is latch connector 84. 
Latch connector 84 includes latch wire block 86 having latch wire 88 
secured thereto. The other end of latch wire 88 operates the hood release 
11. 
Latch wire 88 passes through latch wire slot 90 into latch spring holding 
chamber 92. Adjacent handle chamber 26 and within latch spring holding 
chamber 92 is latch spring 94. Oppositely disposed from handle chamber 26 
and within spring holding chamber 92 is latch spring holder 96. Latch 
spring holder 96 may compress or allow expansion of latch spring 94. 
Red light emitting diode 110 and green light emitting diode 111 appear in 
handle end 22 of housing 20. Red light emitting diode 110 is lit with hood 
release lock 10 in set position 14, in order to provide a visible 
indication to the proper vehicle operator that hood release lock 10 is 
set. Green light emitting diode 111 indicates an engine in operable 
condition. Connections of red light emitting diode 110 and green light 
emitting diode are in standard fashion through solenoid 52. 
As can be seen in FIG. III, set position 14 of hood latch device 10 shows 
handle assembly 70 pushed into housing 20. Ballbearing 32 is pushed into 
ball receiver 82 when detent block 34 is forced against ballbearing 32 by 
detent spring 38. At the same time solenoid armature 56 is pushed into 
locking aperture 40 by action of solenoid 52. This is set position 14 with 
the ignition 19 of vehicle 12 disabled and the hood rendered unopenable. 
As can be seen in FIG. IV, unset position 16 of hood latch device 10 shows 
handle assembly 70 pulled out of housing 20. Ballbearing 32 is pushed into 
detent chamber 28 and detent block 34 is forced against detent spring 38. 
At the same time solenoid armature 56 retreats from locking aperture 40 
back into solenoid 52. This is unset position 16 with the ignition 19 of 
vehicle 12 operable and the hood openable. 
The switch 18 can be hidden because the switch wire 64 is concealed in an 
armored cable and passes through the firewall 17. Thus switch wire 64 
cannot be seen from inside the passenger compartment. It is, therefore, 
extremely difficult to locate switch 18. These difficulties serve to delay 
a prospective car thief sufficiently to make the thief leave the vehicle 
alone. 
Referring now to FIG. V, solenoid 52 is shown in a single switch electrical 
circuit 128 for hood release lock 10 as a modification and further 
explanation of switch 18 of the invention. Solenoid ground 130 forms one 
end of the wiring connection for solenoid 52. Solenoid hot wire 132 is 
wired to the positive terminal of battery 134. Solenoid hot wire 132 is 
protected by armored tube 66 and provides power to hood lock release 10. 
Between the battery 134 and the solenoid hot wire 132 is battery switch 
136. Switch 136 is equivalent to switch 18. 
A green resistor 138 is electrically secured to green diode 111, and a red 
resistor 139 to red diode 110. Green resistor 138 and red resistor 139 may 
be the same type of resistor but the terms are used here for 
distinguishing purposes. Red diode 110 is wired at the other end to the 
red read switch contact 143a. The green diode read switch contact 148 is 
adjacent to the red diode read switch contact 143. Switch wire 150 runs 
between green diode 111 and transistor switch 152. Transistor switch 152 
is wired to coil 154 and ignition switch 156. 
Switch 136 is a momentary switch to energize solenoid 52. This switch 136 
operates the indicated green diode 111 and red diode 110 and causes power 
to the ignition system when energized. Solenoid armature 56 of solenoid 52 
52 shifts when energized and remains mechanically locked until released. 
Within FIG. VI is the additional modification of switch 18 by an operable 
switch circuit 155 to render the ignition 19 operable while the hood 11a 
remains secured. In order to accomplish this feature, green resistor 138 
is wired to green diode 111 while a red resistor 139 is wired to red diode 
110. Between transistor switch 152, and green diode 111 is wired an 
operative switch 164. Operative switch 164 is grounded and permits the 
operation of the ignition 19 while at the same time leaving the hood latch 
11 secured. Thus, these are the only changes in the circuitry diagram 
between FIG. VI and FIG. V. In this fashion, the operative switch 164 used 
in FIG. VI renders the ignition operable while leaving the hood latched 
and permits leaving of the car in a valet type parking lot without 
rendering access to the engine compartment. With operative switch 164 
closed, both red diode 110 and green diode 111 are lit--showing the engine 
operable and hood 11a secured. 
In FIG. VII, hood release lock 10 is shown with adjustable bar assembly 
180. Adjustable bar assembly 180 is another embodiment of hood release 
lock 10 and permits hood release lock 10 to be used on a variety of 
Corvette models. Adjustable bar assembly 180 includes a female nestable 
piece 182 having a housing end 184 secured to housing 20 in an armored 
fashion. Oppositely disposed from housing end 184 is receiving end 186. 
Male nestable piece 188 fits into receiving end 186 at insertable end 190. 
Oppositely disposed from insertable end 190 and also as a unitary part of 
male nestable piece 188 is fire wall end 192 of male nestable piece 188. 
Insertable end 190 fits adjustably into receiving end 186 and permits hood 
release lock 10 to be adjustable for various years of Corvette. 
Fire wall end 192 of male nestable piece 188 includes threaded section 194 
at the end thereof. Stop ridge 196 is an enlarged section of male nestable 
piece 188 adjacent threaded section 194. Slideably mounted over threaded 
section 194 and adjacent stop ridge 196 is passenger washer 198. Passenger 
washer 198 is in the passenger compartment 13 of vehicle 12. 
Engine washer 200 is also slideably mounted over threaded section 194, but 
is within the engine housing 15. Thus, passenger washer 198 and engine 
washer 200 are on opposite sides of fire wall 17. Passenger washer 198 and 
engine washer 200 combine to reinforce fire wall 17 at that point. Nut 204 
is in threaded relation with threaded section 194 to hold stop ridge 196 
tight against passenger washer 198, and to hold passenger washer 198 and 
engine washer 200 tight against fire wall 17. 
In FIG. VIII, a cut-away perspective view of a Corvette 210 is shown with 
hood release lock 10 installed. Hood latch 212 is shown as it is installed 
on Corvette 210 with hood release cable 206 secured thereto in standard 
fashion. Hood release cable 206 is shown as passing through adjustable bar 
assembly 180. Adjustable bar assembly 180 is shown as passing through 
firewall 17 at threaded section 194 and secured to cable end 24 of housing 
20 at housing end 194. Grip 72 is shown oppositely disposed from cable end 
24. In this fashion, the installation of hood release lock 10 in Corvette 
210 is shown as feasible. 
FIG. IX depicts a closeup view of set position 14 of hood release lock 10. 
FIG. X depicts a closeup view of unset position 16 of hood release lock 
10. 
As can be seen when considering FIG. III and FIG. IX together, set position 
14 of hood latch device 10 shows handle assembly 70 pushed into housing 
20. As above stated, handle assembly 70 includes handle 71. Handle 71 
includes a grip 72 and an actuator 74. Actuator 74 has a grip end 76 
adjacent grip 72 and is slideably mounted within handle chamber 26. Grip 
72 is used to change hoodlatching device 10 from set position 14 to unset 
position 16 and the reverse procedure. At the end of actuator 74 opposite 
grip end 76 is a latch activation chamber 80. Between the latch activation 
chamber 80 and grip end 76 is ball receiver 82. Ball receiver 82 receives 
ballbearing 32 when hoodlock device 10 is in set position 14. 
Slideably mounted within latch activation chamber 80 is latch connector 84. 
Latch connector 84 includes latch wire block 86 having latch wire 88 
secured thereto by setscrew 87. Latch wire 88 can be a standard Bowden 
cable suitable for activating hood release 11. The other end of latch wire 
88 operates the hood release 11. 
Latch wire 88 passes through latch wire slot 90 into latch spring holding 
chamber 92. Adjacent handle chamber 26 and within latch spring holding 
chamber 92 is latch spring 94. Oppositely disposed from handle chamber 26 
and within spring holding chamber 92 is latch spring holder 96. Latch 
spring holder 96 may compress or allow expansion of latch spring 94 
because of latch spring holder 96 being secured to the latch wire 88 by a 
second set screw 97. 
As can be seen in FIG. X (which is a partial, close-up view of handle 
assembly 70), unset position 16 of hood latch device 10 shows handle 
assembly 70 pulled out of housing 20. Ballbearing 32 is pushed into detent 
chamber 28. This is unset position 16 with the ignition 19 of vehicle 12 
operable and the hood 11a openable, but without hood release 11 released. 
This is made possible by latch spring holding chamber 92 having a cap 98 
adjacent actuator 74. 
Cap 98 is slideably mounted on latch wire 88. Latch spring 94 springloads 
cap 98 within latch spring holding chamber 92 and against spring chamber 
end 102. In this fashion cap distance is developed. 
The cap distance 100 is between cap 98 and spring chamber end 102 of spring 
holding chamber 92 is substantially the same as block distance 104 when 
hood release lock 10 is in set position 14, or unset position 16, or 
positions therebetween. Block distance 104 is the distance between latch 
wire block 86 and spring chamber end 106 of latch activation chamber 80. 
As can be seen in FIG. XI, hood 11a is now opened and unlatched. Handle 
assembly 70 is pulled out of housing 20. Ballbearing 32 is out of ball 
receiver 82 when detent block 34 is forced away from ballbearing 32 by 
detent spring 38. At the same time solenoid armature 56 is pulled out of 
locking aperture 40 by action of solenoid 52. 
Referring now to FIG. XII (which is a modification of FIG. V), a relay 250 
is shown as replacing transistor 152 in proper electrical connection. 
Relay 250 handles higher current and permits operation of a heavier duty 
circuit. Like transistor 152, relay 250 is under the hood 11 of the 
vehicle. Relay 250 has a negative ground through relay coil 254. Relay 
switch 256 is connected to the starter solenoid (not shown) and to power 
wire 258 ignition switch (not shown) thereby providing a switch between 
the starter solenoid and the ignition switch. 
Because of the disclosure herein and solely because of the disclosure 
herein, certain modifications hereof can become apparent to those having 
ordinary skill in this art. Such modifications are clearly covered hereby.