CA1268638A - Antitheft device for automotive vehicles - Google Patents
Antitheft device for automotive vehiclesInfo
- Publication number
- CA1268638A CA1268638A CA000494883A CA494883A CA1268638A CA 1268638 A CA1268638 A CA 1268638A CA 000494883 A CA000494883 A CA 000494883A CA 494883 A CA494883 A CA 494883A CA 1268638 A CA1268638 A CA 1268638A
- Authority
- CA
- Canada
- Prior art keywords
- check valves
- rod
- brake
- mechanical means
- brakes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Regulating Braking Force (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An antitheft device includes a switch inserted in the electric supply circuit for an auto-vehicle. A control element which is operated by a key or a combination device acts simultaneously in the switch and the valves to cause, in a first position, an interruption of the electric circuit and a locking of the brake circuit and, in a second position, re-establishment of the electric circuit and the brake circuit.
An antitheft device includes a switch inserted in the electric supply circuit for an auto-vehicle. A control element which is operated by a key or a combination device acts simultaneously in the switch and the valves to cause, in a first position, an interruption of the electric circuit and a locking of the brake circuit and, in a second position, re-establishment of the electric circuit and the brake circuit.
Description
This inven-tion relates to an antitheft device for au-tomotive vehicles.
An already known an-tltheft device for automotive vehicles comprises a switch in the electric supply circuit of the vehicle's engine, a check valve in the vehicle's brake circuit and a control element operable by a key or by a com-bination device or similar. This control element acts simultaneously on the switch and the valve in order to 1~ cause, in a ~irst position, an interruption of the electric circuit and a locking of the brake circuit and, in a second position, to cause the re-establishment both of the electric circuit and the brake circuit.
Embodiments of these devices are disclosed in US Patents No.
3,515,442 and 3,617,663.
In the above patents, the brake locking devices described, comprise a valve block provided with two parallel passages, each passage having a valve seat midway along its length.
Against each of these seats, a ball check valve is held closed due to the action of a coil spring. Two plungers are slidably mounted within respective bores forming a part of the passage. The plungers are provided with dxiving means in order to be moveable axially in a direction which unseats the ball check valves against -the action of the coil spring.
Each plunger is provided with a seal ring. The driving means comprises a crosshead having opposite end portions, which contact -the projecting ends o-f the plungers, and a curved surface which is engaged by a cam member mounted to turn within a bore of the body of the device. Within this ~bore then is housed a key-operated lock assembly. Due to the turning movement of the cam member, the plungers move to :. , ~:
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" `. ` ~`.' ' $3~3 unseat the ball check valves so -that the hydraulic fluid may flow from -the inlets to the outlets of the loc}cing device.
The device is also provided with means for in-terrup-ting the electrical lead wire connected to the star-ter switch of the starter motor.
In operation the wheel bralces are applied by depressing the brake pedal so pressuri~ing the hydraulic lines leading to the vehicle's brakes. While the pedal is still depressed, the key is turned thus locking the device. The brake pedal may then be released and the brake lines remain pressurized because the ball check valves preven-t the return flow of the hydraulic fluid.
Moreover, in this position of the key the starter switch is inoperative and the vehicle remainS locked. The above specified devices present some drawbacks, the most important of which is due to the presence of the seal rings mounted on the plungers. Indeed due to the fact that the pressures developed for activating the brakes can reach a value of 120 ATM, the seal rings are obliged to work under high stress and thus deteriorate quickly. In this way they easily lose their sealing features and the locking device does not work efficiently~
The main object of the present invention is therefore to eliminate the above drawbacks of the prior art by providing ; an antithef-t device for automotive vehicles in which ~30 particularly shaped sealing rings cooperating with the plungers do not move with these latter but are fixedly mounted in respective housings provided within the body oE
the device, so improving the reliability of the antitheft device itself~
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Another object o-f the present invention is to imp:rove the electrical unit of the }cnown devices by providing a switch having two palrs of double contacts in order to act not only on the starter engine, but also on another electrical component of -the vehicle such as, for example, an acoustic warning de~ice.
A further importan-t objec-t of this invention is to provide an anti-the~-t device which is highly functional and has a low price relative -to -the high degree of safety that it can ensure.
In meeting these and other objects, the present invention provides an antitheft device for an automotive vahicle equipped wi-th at least two electric circui-ts and front and rea:r hydraulic brakes, a hydraulic circuit for each brake, and brake ac-tuation means operatively associated wi-th the hydraulic circuits for controlling their operation; the device comprising:
- a switch provided with first and second pairs oE contacts, each pair forming a component in respective electric circuits;
: - front and rear brake check valves mounted in respective hydraulic circuits ;
- mechanical means mounted adjacent to the check valves and movable between a first position in which the mechanical means engages the check valves and holds the check valves open, thereby permitting normal application and release of the brakes under the con-trol of the brake actuation means, ; and a second position in which the mechanical means is ~ disengaged from the check valves and permi-ts the check : valves to open in response to actuation of the brake actuation means and otherwise to close, thereby permitting .~
. .
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` ', "` ,, ' ' application but preventing release oE the brakes, and - key-controlled means mechanically connec-ted to -the mechanical means and con-trolling the movemen-t thereof between the firs-t and second posi-t.ion, - the mechanical means comprising a pair of rod-shaped extensions operatively associated with respective check valves; a pair of bores provided in the body of the device for passage of -the extensions; a pair of sealing elements fixedly mounted in respective bores, respective rod-shaped extensions being slidingly movable within the sealing elemen-ts and operatively associated with the check valves;
a transverse ~ember connected to each of the rod-shaped ex-tensions; a two-ended bolt connected at one end thereof to the transverse member and movable in response to operation of the key-control~ed means; and a push-button carried by the switch and in biasing relationship against the other end of the bol-t for simultaneously controlling the firs-t and second pairs of contacts.
Further features and advantages of the invention will best be understood from the detailed description of a preferred bu-t not restrictive embodiment of an antitheft device for automobiles,according -to -the invention, shown by way of illustrative but non-limiting example with reference to the accompanying drawings.
- Fig. 1 is a par-tially sectional plan view of the device according to the invention - Fig. 2 shows a diagram for using the device according to the invention; and : - Fig. 3 is a sectional view in an enlarged scale of the sealing means shown in fig. lo With reference -to the drawings, the device according to the . 4 -. ~ ! ' ' ~ .
. . , . '~ ' . ': , .
' ' ' invention, generall~ indicated at A, comprises two prismatic blocks l and 2, integral to one another by means of screws 3; a cylinder lock 4 operable by a key 5 is provided in block l. Activation of the cylinder lock 4 causes a bolt 6 to move back and forth. One encl of -this bolt engages wi-th a swi-tch 7, to be inserted in the electric supply circuit of the engine while, at its opposite end, the same bolt 6 is integral, by means of a transverse member 8, to two rod-shaped extensions 9 and 10 parallel to the axis oE the bol-t and disposed at a certain mutual distance in order to form a fork. The member 8 can move within a suitable seat ll in block 2 while rods 9 and 10 are slidable into corresponding bores 30 and 31 also formed in the block 2, in order to engage, at their free ends, with two check valves made up of balls 12 and 13 -thrust towards their respective seats by springs 12a and 13a.
These check valves are housed in connections 14 and 15 which can be screwed in corresponding holes provided in block 2:
two o-ther connections 18 and 19 end in -the same holes, at 16 and 17.
Connections 18 and 19 are connected, by means of respective pipes 20 and 21, to the brake master cylinder 22. More particularly, pipe 20 is connected to the outlet 23 of the master cylinder 22, arranged to operate the rear wheel brakes, while the other pipe 21 is connected, through the connection line 24 and two other pipes 25, to the two outlets 26 of the master cylinder arrangecl to operate the front wheel brakes (Fig. 2). Finally, connections 14 and 15 are connected to respective pipes 27 and 28, one of which (27) diverges into two pipes 27a and 27b (Fi~. 2) connected to the front wheel brakes, while the o-ther (28) is connected to the rear wheel brakes.
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Referring now to Fig. 3,in each of the bores 30 and 31 is fixedly mounted a sealing element 32. Each of these sealing elements 32 is formed by two annular concentric portions 33 and 34 joined together by another por-tion 35 to form an annular recess 36. An annular lip 37 pro-truding transversally from -the free end of the portion 30 facili-ta-tes the engagemen-t of the sealing elements in the bores 30 and 31. I-t is to be noted that the rod-shaped axtensions 9 and 10 can slidingly move within -the internal annular por-tion 34 of the sealing elements 32 without moving -these latter because the pressure developed within the annular recesses 36 causes the portions 33 -to adhere to the walls of the bores 30 and 31 and the portions 34 to adhere to the rod-shaped extensions.
Referring now to Fig. 1, the bolt 6, at its other end, is in biasing relationship with a push button 40 of the electric switch 7. This switch substantially consists of a box-shaped housing 42 within which said push-button 40 is slidably housed, against the action of a coil spring 43.
Switch 7 bears two pairs of double contacts indicated at 44 and 45 respectively. One pair 44 consists of a fixed contact 46 leading off -to a terminal 47 and of a movable contact 48 which, owing to the ac-tion of a coil spring 49, is elastically located within a hollow lug 50 of push-button 40. The second pair of contacts 45 in turn consists of a fixed contact 51 to which a terminal 52 is integral and of a movable contact 53 which, owing to the presence of a coil spring 54, is elastically located within a second hollow lug 55 of push-button 40. It should be noted that when contacts Sl and S3 are connected to each other and therefore permit curren-t flow, contacts 46 and 48 are disconnected and vice-versa. Tha-t allows one for example to connect contacts 51 . .
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:' ' : ' and 53 to the electric engine ignition system by means of a connection to the battery, the s-tarter or the electro-valve, while contacts 46 and 48 may be connected to an acoustic warning device constituted for example by the vehicle horn itself, addi-tional horns or an elec-tric siren.
The operation of the device described above appears evident.
By rotating key 5 in the OFF position, bolt 6 is moved towards the right (wi-th reference to Fig. 1), so that switch 7 will complete the electric supply circuit of the engine, while rods 9 and 10 keep the check valves open -thrusting the balls 12 and 13 away from their seats, as shown in-Fig. 1.
Thus -the brakes' hydraulic system is kept open thereby allowing the normal flow and reflow of the oil with consequent regular functioning of the brakes of all four wheels. More precisely, the oil forced ou-t by the master cylinder 22 can go in the normal way from pipe 20 to pipe 28 to actuate the rear wheel brakes and from pipe Zl to pipe 27, to actuate the fron-t wheel brakes and then normally flow back after each braking.
On the contrary, by rotating key 5 in the ON position, bolt 6 is moved in -the di.rection opposite to the above, causing rods 9 and 10 to move to the left, thus allowing balls 12 and 13 to adhere to the respective seats, while switch 7 opens the electric supply ci.rcuit of -the engine. Under these conditons, if the brake pedal is depressed, -the oil can go in the normal way to the brake cylinders, locking the wheels, bu-t the twocheck valves no longer allow the normal flow back of the oil, so that the brakes, immediately after ~ functioni~g, are permanently locked. To restore the normal : operation of the hydrauIic system it is necessary to move : key 5 into the OFE' position.
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The presence of two check valves in the hydraulic circuit, one for the front brakes and one for -the rear brakes, makes the antitheft device particularly safe against any attempt to tamper with it.
On the other side of the prismatic block l, the bolt 6 bears against push-button 40 50 that contacts ~6 and 48 connected to the electric warning circuit are closed at the same time as contacts 51 and 53 connected to the electric engine feeding circuit are open. Therefore, if a thief does not disconnect the above described antitheft device but tries anyway to cause the vehicle to move using a facsimile key, the warning circui-t is caused to trip, while, a-t -the same time, the electric engine feeding circuit cannot be closed.
Should a thief succeed in tampering with the electric part of the antitheft device oE the invention, the hydraulic systems would still remain locked.
As the antitheft device of the invention controls the essential operating members of a vehicle such as the brakes, they make the removal of -the same vehicle practically impossible.
Obviously, various modifications and variations may be made to the above described device without departing from the scope of the inven-tion.
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An already known an-tltheft device for automotive vehicles comprises a switch in the electric supply circuit of the vehicle's engine, a check valve in the vehicle's brake circuit and a control element operable by a key or by a com-bination device or similar. This control element acts simultaneously on the switch and the valve in order to 1~ cause, in a ~irst position, an interruption of the electric circuit and a locking of the brake circuit and, in a second position, to cause the re-establishment both of the electric circuit and the brake circuit.
Embodiments of these devices are disclosed in US Patents No.
3,515,442 and 3,617,663.
In the above patents, the brake locking devices described, comprise a valve block provided with two parallel passages, each passage having a valve seat midway along its length.
Against each of these seats, a ball check valve is held closed due to the action of a coil spring. Two plungers are slidably mounted within respective bores forming a part of the passage. The plungers are provided with dxiving means in order to be moveable axially in a direction which unseats the ball check valves against -the action of the coil spring.
Each plunger is provided with a seal ring. The driving means comprises a crosshead having opposite end portions, which contact -the projecting ends o-f the plungers, and a curved surface which is engaged by a cam member mounted to turn within a bore of the body of the device. Within this ~bore then is housed a key-operated lock assembly. Due to the turning movement of the cam member, the plungers move to :. , ~:
..,:
" `. ` ~`.' ' $3~3 unseat the ball check valves so -that the hydraulic fluid may flow from -the inlets to the outlets of the loc}cing device.
The device is also provided with means for in-terrup-ting the electrical lead wire connected to the star-ter switch of the starter motor.
In operation the wheel bralces are applied by depressing the brake pedal so pressuri~ing the hydraulic lines leading to the vehicle's brakes. While the pedal is still depressed, the key is turned thus locking the device. The brake pedal may then be released and the brake lines remain pressurized because the ball check valves preven-t the return flow of the hydraulic fluid.
Moreover, in this position of the key the starter switch is inoperative and the vehicle remainS locked. The above specified devices present some drawbacks, the most important of which is due to the presence of the seal rings mounted on the plungers. Indeed due to the fact that the pressures developed for activating the brakes can reach a value of 120 ATM, the seal rings are obliged to work under high stress and thus deteriorate quickly. In this way they easily lose their sealing features and the locking device does not work efficiently~
The main object of the present invention is therefore to eliminate the above drawbacks of the prior art by providing ; an antithef-t device for automotive vehicles in which ~30 particularly shaped sealing rings cooperating with the plungers do not move with these latter but are fixedly mounted in respective housings provided within the body oE
the device, so improving the reliability of the antitheft device itself~
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3~ `
Another object o-f the present invention is to imp:rove the electrical unit of the }cnown devices by providing a switch having two palrs of double contacts in order to act not only on the starter engine, but also on another electrical component of -the vehicle such as, for example, an acoustic warning de~ice.
A further importan-t objec-t of this invention is to provide an anti-the~-t device which is highly functional and has a low price relative -to -the high degree of safety that it can ensure.
In meeting these and other objects, the present invention provides an antitheft device for an automotive vahicle equipped wi-th at least two electric circui-ts and front and rea:r hydraulic brakes, a hydraulic circuit for each brake, and brake ac-tuation means operatively associated wi-th the hydraulic circuits for controlling their operation; the device comprising:
- a switch provided with first and second pairs oE contacts, each pair forming a component in respective electric circuits;
: - front and rear brake check valves mounted in respective hydraulic circuits ;
- mechanical means mounted adjacent to the check valves and movable between a first position in which the mechanical means engages the check valves and holds the check valves open, thereby permitting normal application and release of the brakes under the con-trol of the brake actuation means, ; and a second position in which the mechanical means is ~ disengaged from the check valves and permi-ts the check : valves to open in response to actuation of the brake actuation means and otherwise to close, thereby permitting .~
. .
, . ~: .
` ', "` ,, ' ' application but preventing release oE the brakes, and - key-controlled means mechanically connec-ted to -the mechanical means and con-trolling the movemen-t thereof between the firs-t and second posi-t.ion, - the mechanical means comprising a pair of rod-shaped extensions operatively associated with respective check valves; a pair of bores provided in the body of the device for passage of -the extensions; a pair of sealing elements fixedly mounted in respective bores, respective rod-shaped extensions being slidingly movable within the sealing elemen-ts and operatively associated with the check valves;
a transverse ~ember connected to each of the rod-shaped ex-tensions; a two-ended bolt connected at one end thereof to the transverse member and movable in response to operation of the key-control~ed means; and a push-button carried by the switch and in biasing relationship against the other end of the bol-t for simultaneously controlling the firs-t and second pairs of contacts.
Further features and advantages of the invention will best be understood from the detailed description of a preferred bu-t not restrictive embodiment of an antitheft device for automobiles,according -to -the invention, shown by way of illustrative but non-limiting example with reference to the accompanying drawings.
- Fig. 1 is a par-tially sectional plan view of the device according to the invention - Fig. 2 shows a diagram for using the device according to the invention; and : - Fig. 3 is a sectional view in an enlarged scale of the sealing means shown in fig. lo With reference -to the drawings, the device according to the . 4 -. ~ ! ' ' ~ .
. . , . '~ ' . ': , .
' ' ' invention, generall~ indicated at A, comprises two prismatic blocks l and 2, integral to one another by means of screws 3; a cylinder lock 4 operable by a key 5 is provided in block l. Activation of the cylinder lock 4 causes a bolt 6 to move back and forth. One encl of -this bolt engages wi-th a swi-tch 7, to be inserted in the electric supply circuit of the engine while, at its opposite end, the same bolt 6 is integral, by means of a transverse member 8, to two rod-shaped extensions 9 and 10 parallel to the axis oE the bol-t and disposed at a certain mutual distance in order to form a fork. The member 8 can move within a suitable seat ll in block 2 while rods 9 and 10 are slidable into corresponding bores 30 and 31 also formed in the block 2, in order to engage, at their free ends, with two check valves made up of balls 12 and 13 -thrust towards their respective seats by springs 12a and 13a.
These check valves are housed in connections 14 and 15 which can be screwed in corresponding holes provided in block 2:
two o-ther connections 18 and 19 end in -the same holes, at 16 and 17.
Connections 18 and 19 are connected, by means of respective pipes 20 and 21, to the brake master cylinder 22. More particularly, pipe 20 is connected to the outlet 23 of the master cylinder 22, arranged to operate the rear wheel brakes, while the other pipe 21 is connected, through the connection line 24 and two other pipes 25, to the two outlets 26 of the master cylinder arrangecl to operate the front wheel brakes (Fig. 2). Finally, connections 14 and 15 are connected to respective pipes 27 and 28, one of which (27) diverges into two pipes 27a and 27b (Fi~. 2) connected to the front wheel brakes, while the o-ther (28) is connected to the rear wheel brakes.
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Referring now to Fig. 3,in each of the bores 30 and 31 is fixedly mounted a sealing element 32. Each of these sealing elements 32 is formed by two annular concentric portions 33 and 34 joined together by another por-tion 35 to form an annular recess 36. An annular lip 37 pro-truding transversally from -the free end of the portion 30 facili-ta-tes the engagemen-t of the sealing elements in the bores 30 and 31. I-t is to be noted that the rod-shaped axtensions 9 and 10 can slidingly move within -the internal annular por-tion 34 of the sealing elements 32 without moving -these latter because the pressure developed within the annular recesses 36 causes the portions 33 -to adhere to the walls of the bores 30 and 31 and the portions 34 to adhere to the rod-shaped extensions.
Referring now to Fig. 1, the bolt 6, at its other end, is in biasing relationship with a push button 40 of the electric switch 7. This switch substantially consists of a box-shaped housing 42 within which said push-button 40 is slidably housed, against the action of a coil spring 43.
Switch 7 bears two pairs of double contacts indicated at 44 and 45 respectively. One pair 44 consists of a fixed contact 46 leading off -to a terminal 47 and of a movable contact 48 which, owing to the ac-tion of a coil spring 49, is elastically located within a hollow lug 50 of push-button 40. The second pair of contacts 45 in turn consists of a fixed contact 51 to which a terminal 52 is integral and of a movable contact 53 which, owing to the presence of a coil spring 54, is elastically located within a second hollow lug 55 of push-button 40. It should be noted that when contacts Sl and S3 are connected to each other and therefore permit curren-t flow, contacts 46 and 48 are disconnected and vice-versa. Tha-t allows one for example to connect contacts 51 . .
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....
:' ' : ' and 53 to the electric engine ignition system by means of a connection to the battery, the s-tarter or the electro-valve, while contacts 46 and 48 may be connected to an acoustic warning device constituted for example by the vehicle horn itself, addi-tional horns or an elec-tric siren.
The operation of the device described above appears evident.
By rotating key 5 in the OFF position, bolt 6 is moved towards the right (wi-th reference to Fig. 1), so that switch 7 will complete the electric supply circuit of the engine, while rods 9 and 10 keep the check valves open -thrusting the balls 12 and 13 away from their seats, as shown in-Fig. 1.
Thus -the brakes' hydraulic system is kept open thereby allowing the normal flow and reflow of the oil with consequent regular functioning of the brakes of all four wheels. More precisely, the oil forced ou-t by the master cylinder 22 can go in the normal way from pipe 20 to pipe 28 to actuate the rear wheel brakes and from pipe Zl to pipe 27, to actuate the fron-t wheel brakes and then normally flow back after each braking.
On the contrary, by rotating key 5 in the ON position, bolt 6 is moved in -the di.rection opposite to the above, causing rods 9 and 10 to move to the left, thus allowing balls 12 and 13 to adhere to the respective seats, while switch 7 opens the electric supply ci.rcuit of -the engine. Under these conditons, if the brake pedal is depressed, -the oil can go in the normal way to the brake cylinders, locking the wheels, bu-t the twocheck valves no longer allow the normal flow back of the oil, so that the brakes, immediately after ~ functioni~g, are permanently locked. To restore the normal : operation of the hydrauIic system it is necessary to move : key 5 into the OFE' position.
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... : . :: ., 3~
The presence of two check valves in the hydraulic circuit, one for the front brakes and one for -the rear brakes, makes the antitheft device particularly safe against any attempt to tamper with it.
On the other side of the prismatic block l, the bolt 6 bears against push-button 40 50 that contacts ~6 and 48 connected to the electric warning circuit are closed at the same time as contacts 51 and 53 connected to the electric engine feeding circuit are open. Therefore, if a thief does not disconnect the above described antitheft device but tries anyway to cause the vehicle to move using a facsimile key, the warning circui-t is caused to trip, while, a-t -the same time, the electric engine feeding circuit cannot be closed.
Should a thief succeed in tampering with the electric part of the antitheft device oE the invention, the hydraulic systems would still remain locked.
As the antitheft device of the invention controls the essential operating members of a vehicle such as the brakes, they make the removal of -the same vehicle practically impossible.
Obviously, various modifications and variations may be made to the above described device without departing from the scope of the inven-tion.
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Claims (4)
1. An antitheft device for an automotive vehicle equipped with at least two electric circuits and front and rear hydraulic brakes, a hydraulic circuit for each brake, and brake actuation means operatively associated with said hydraulic circuits for controlling their operation; the device comprising:
- a switch provided with first and second pairs of contacts, each pair forming a component in respective electric circuits;
- front and rear brake check valves mounted in respective hydraulic circuits :
- mechanical means mounted adjacent to said check valves and movable between a first position in which said mechanical means engages said check valves and holds said check valves open, thereby permitting normal application and release of said brakes under the control of said brake actuation means, and a second position which said mechanical means is disengaged from said check valves and permits said check valves to open in response to actuation of said brake actuation means and otherwise to close, thereby permitting application but preventing release of said brakes, and - key-controlled means mechanically connected to said mechanical means and controlling the movement thereof between said first and second position, - said mechanical means comprising a pair of rod-shaped extensions operatively associated with respective check valves; a pair of bores provided in the body of the device for passage of said extensions; a pair of sealing elements fixedly mounted in respective bores, respective rod-shaped extensions being slidingly movable within said sealing elements and operatively associated with said check valves; a transverse member connected to each of said rod-shaped extensions; a two-ended bolt connected at one end thereof to said transverse member and movable in response to operation of said key-controlled means; and a push-button carried by said switch and in biasing relationship against the other end of said bolt for simultaneously controlling said first and second pairs of contacts.
- a switch provided with first and second pairs of contacts, each pair forming a component in respective electric circuits;
- front and rear brake check valves mounted in respective hydraulic circuits :
- mechanical means mounted adjacent to said check valves and movable between a first position in which said mechanical means engages said check valves and holds said check valves open, thereby permitting normal application and release of said brakes under the control of said brake actuation means, and a second position which said mechanical means is disengaged from said check valves and permits said check valves to open in response to actuation of said brake actuation means and otherwise to close, thereby permitting application but preventing release of said brakes, and - key-controlled means mechanically connected to said mechanical means and controlling the movement thereof between said first and second position, - said mechanical means comprising a pair of rod-shaped extensions operatively associated with respective check valves; a pair of bores provided in the body of the device for passage of said extensions; a pair of sealing elements fixedly mounted in respective bores, respective rod-shaped extensions being slidingly movable within said sealing elements and operatively associated with said check valves; a transverse member connected to each of said rod-shaped extensions; a two-ended bolt connected at one end thereof to said transverse member and movable in response to operation of said key-controlled means; and a push-button carried by said switch and in biasing relationship against the other end of said bolt for simultaneously controlling said first and second pairs of contacts.
2. A device according to claim 1, wherein said sealing elements each comprise two annular concentric portions joined together to form an annular recess, the outer portion being fixedly mounted within said bore of the device and the inner portion being in sealing slidable contact with a respective rod-shaped element.
3. A device according to claim 2, wherein said annular recess is in communication with respective hydraulic circuits.
4. A device according to claim 1, 2 or 3, wherein said mechanical means holds said check valves open by means of respective first ends of respective rod-shaped extensions each first end abutting a respective valve and displacing said valve from a corresponding valve seat, and wherein said transverse member is connected to second ends of said rod-shaped extensions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000494883A CA1268638A (en) | 1985-11-08 | 1985-11-08 | Antitheft device for automotive vehicles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000494883A CA1268638A (en) | 1985-11-08 | 1985-11-08 | Antitheft device for automotive vehicles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1268638A true CA1268638A (en) | 1990-05-08 |
Family
ID=4131835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000494883A Expired - Fee Related CA1268638A (en) | 1985-11-08 | 1985-11-08 | Antitheft device for automotive vehicles |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1268638A (en) |
-
1985
- 1985-11-08 CA CA000494883A patent/CA1268638A/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |