CA1270543A - Inertia switch - Google Patents
Inertia switchInfo
- Publication number
- CA1270543A CA1270543A CA000552368A CA552368A CA1270543A CA 1270543 A CA1270543 A CA 1270543A CA 000552368 A CA000552368 A CA 000552368A CA 552368 A CA552368 A CA 552368A CA 1270543 A CA1270543 A CA 1270543A
- Authority
- CA
- Canada
- Prior art keywords
- elongated member
- vehicle
- state
- secured
- metal arm
- 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
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/135—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by making use of contacts which are actuated by a movable inertial mass
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/14—Switches operated by change of acceleration, e.g. by shock or vibration, inertia switch
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/14—Switches operated by change of acceleration, e.g. by shock or vibration, inertia switch
- H01H35/141—Details
- H01H35/143—Resetting means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Switches Operated By Changes In Physical Conditions (AREA)
Abstract
A B S T R A C T
An inertia switch for a vehicle which is capable of being displaced from a first stable position to a second stable position upon being subjected to rapid deceleration and to activate an electrical circuit when in the second stable position, comprising a longitudinally slideable elongated member with manipulating means on one end thereof and means for completing an electrical circuit on the other end thereof, and spring means capable of two stable states to urge the elongated member to said first stable position or to said second stable position according to the inertial momentum.
An inertia switch for a vehicle which is capable of being displaced from a first stable position to a second stable position upon being subjected to rapid deceleration and to activate an electrical circuit when in the second stable position, comprising a longitudinally slideable elongated member with manipulating means on one end thereof and means for completing an electrical circuit on the other end thereof, and spring means capable of two stable states to urge the elongated member to said first stable position or to said second stable position according to the inertial momentum.
Description
s~
FIELD OF THE INVENTION
This invention relates to inertia switches.
More particularly, this invention relates to an inertia switch for activating the hazard lights of a vehicle upon impact or severe deceleration.
BACKGROUND OF THE INVENTION
~ .. . . . . ~
In the event of motor vehicle accidents, it is desirable to have automatic means for activating various safety features of the vehicle. The same need arises in relation to other means of transportation such as aircraft.
Canadian Patent 522,231, which issued February 28, 1986 to the Pyree and Company, discloses an inertia switch for an aircraft to provide for the autornatic activation and control of apparatus such as fire extinguishers. The inertia switch of the Pyree and Company patent comprises housing and contact surfaces which are spaced a short distance apart under normal conditions.
One of the contact surfaces is in the shape of a disk. The other contact surface is in the form a cup, which partly surrounds the disk but does not touch it when the vehicle is at rest. The contacts are carried on supports with differing moments of`
inertia such that under conditions of constant deceleration, the contacts will not rneet, but in the event of higher differentials ~7~
~f velocity, such as the case of a collision, the displacement of the disk and the surrounding cup will vary with respect to one another such that the disk will come into contact with the cup thus establishing an electrical connection.
Canadian Patent 809,825 whic`n was issued April 1, 1969 to Paonessa, discloses an inertia switch involving a heavy metal ball and a spring. The metal ball is positioned within a metal cage in an enclosure which extends parallel to the direction of travel of the vehicle. A spring urges the metal cage towards the rear end of the enclosure. An electrical contact is provided at the forward end of the enclosure. Upon rapid deceleration such as in the case of a co].lision, the forward inertia of the heavy metal ball urges the cage forward against the spring and into contact with the electrical contact thus activating a warning systesn for any vehicles behind the decelerating vehicle.
Canadian Patent 998,138 issued October 5, 1976 to Nissan Motor Company Limited discloses a trigger switch mechanisrn for airbags in a vehicle. The mechanism consists of an arcuate member made of piezoelectric material held in position at one end of a casing and a weight movably supported against the inner surface of the arcuate rnember by a spring. Two electrical terminals are connected at opposite ends of the piezoelectric ~7~3 material. In the event of rapid deceleration, the inertia of the weight exerts pressure on the piezoelectric material thus inducing a voltage response between two terminals proportional to the pressure. The proportional voltage is used to control the activation of the airbags in the event of a collision.
Each of the patents referred to above discloses a mechanisrn for automatically enabling a contact switch in the event of a collision. However, none of the patents describes a inertia switch which may be manually operated at the discretion of the vehicle operator. In the case of hazard lights for example, it is desirable that in the event of rapid deceleration or collision, the hazard lights would be autornatically enabled, but that they would otherwise be subject to manual operation by the vehicle operator. Moreover, it is desirable in such circumstances as a collision that means be provided for ensuring that the inertia switch will remain engaged until disabled by the vehicle operator.
OBJECTS OF THE INVENTION
It is therefore an object of the present inventinn to provide an automatic inertia switch which may be manually activated.
~27~
,, It is a further object of this invention to provide an automatic inertia switch which will remain activated after a collision until manually deactivated.
It is yet a further object of the invention to provide such an aukomatic inertia switch which is simple in construction and which may be fitted to the dashboard of a motor vehicle.
SUMMARY OF THE_INVENTION
The inertia switch of the present invention comprises an elongated member slidably extending through the dashboard of a vehicle such that the longitudinal axis of the member is substantially parallel to the direction of travel of the vehicle.
One end of the member is provided with manipulating means and the opposite end of the member is provided with rneans for completing an electrical circuit when the member is slid to its forwardmost extent. Means extend between the member and a fixed point on the frame of the vehicle, said means being capable of assuming a first stable state in which the member is urged rearwardly and a second stable state in which the member is urged towards it forwardmost extent, said means further being capable of effecting a transition from the first state to the second state when the vehicle is subjected to rapid deceleration and from the second ~ ;27~
state to the first state when the member is pulled rearward by said manipulating means.
FIGURES
The invention may be more fully appreciated by reference to the illustrations and description of a preferred embodiment of the invention, in which:
Figure 1 is a side elevation of the invention wherein the elongated member is in its rearward configuration.
Figure 2 is a side elevation of the invention wherein the elongated member is in its forwardmost position.
Figure 3 is a sectional view taken along line 3-3 of Figure ~' 2.
DETAILED DESCRIPTION OF THE PRE~ERRED EMBODIMENT
Referring to Figure 1, the dashboard of a vehicle is designated by the numeral 1. The forward direction of travel of the vehicle is indicated by arrow 2 while the rearward direction of travel is indicated by arrow 1~.
`` ~.2~
A backplate 5 is secured by bolts 7 and 9 to the back of the dashboard 1.
A bushing 8, which may be of nylon or other suitable material is mounted integrally with backplate 5. A cylindrical elongated push rod 6 extends through the bushing 8 in a direction parallel to the direction of travel of the vehic:Le. The push rod 6 is adapted to slide through the bushing 8 along the push rod's longitudinal extent.
Manipulating means 10 are provided at the rearward end 12 of the push rod 6 whereby the vehicle operator may slide the push rod 6 forward or rearward as desired, as more fully discussed below.
The forward end 1ll of the push rod 6 is provided with means 16 to complete an electrical circuit when the push rod 6 is slid to its forwardmost extent, as illustrated in Figure 2. In the preferred embodiment described herein, such means 16 consists of an electrically conduct:ive contact plate 18.
An electrical switch 20 is fixed to the vehicle in longitudinally spaced relation with respect to the push rod 6.
Electrical switch 20 includes electrical contact points 22 and ~7QS~3 24, which open to a circuit 26 adapted to operate safety lights, air bags, or other devices in the vehicle. Such devices will be activated when the push rod 6 is slid to its forwardmost extent thereby bringing the plate 18 into contact with the electrical contact points 22 and 24 to close the electrical circuit 26, as best illustrated in Figure 2.
As best illustrated in Figure 3, the push rod 6 is journaled laterally through its diameter as at 28. A shaft 30 is disposed through the journal 28. Shaft 30 is of a length greater than the diameter of the push rod 6 so as to accommodate a mass 32 which is secured to the push rod 6 about the journaled portion 28 thereof.
Still referring to Figure 3, each end 36, 38 of the shaft 30 acts as a fulcrum and securement point for a pair of rigid connecting arms 40, 42 (about left end 36 of shaft 30) and 44, 46 (about right end 38 of shaft 30). A lock pin 48 retains the shaf`t 30 in the journa]. 28.
It can therefore be seen that the mass 32 is sandwiched between the connecting arms L10, 42, and 4l1, 46 about the journaled portion 28 of the push rod 6.
- ~27~5~3 The pair of connecting arrns 40, 44 iS adapted to be pivoted about the ends 36, 38 of the shaft 30 independently of the pair of connecting arms 42, 46.
Connecting arms 40 and 44 curve towards each other to be pivotally secured to one end 48 of a first metal spring 50 by means of a shaft 52. Similarly, connecting arms 42 and 46 curve towards each other to be pivotally secured to one end 54 of the second spring 56 by means of a shaft 58.
In the preferred embodiment described herein, the metal springs 50 and 56 are made of flat elongated strips of resilient and flexible metal. As best illustrated in Figure 1, the other ends 60 and 62 of the metal springs 50, 56 respectively are secured to the backplate 5 by rivets 64, 66, 68, 70.
The operation of the invention is as follows. In normal operation of the vehicle, the push rod 6 is urged rearward by the connecting arms which form an angle 72 with the push rod 6 which angle ol)ens towards the front of the vehicle. In this state, the tension induced by the curvature of the metal springs 50 and 56 maintains an inward pressure on the connecting arms which tends to reduce the angle 72 and thereby urges the push rod 6 rearward.
In this stable state, the contact plate 18 is not in contact with ~7~543 the electrical contact points 22 and 24 and the circuit 26 remains open.
When the vehicle undergoes rapid deceleration, as in the event of a collision, the momentum of the mass 32 will urge the push rod 6 forward thus forcing the connecting arms to overcome the tension in metal springs 50 and 56 and to pivot about the shaft 30 to a new stable position wherein the push rod is slid to its forwardmost extent as illustrated in Figure 2. The mass 32 must be chosen so that its momentum will overcome the metal springs 50, 56 in such circumstances.
In this new stable state, the plate 18 is in contact with electrical contact points 22, 24 thereby closing circuit 26 and activating the safety and other devices which are connected to the circuit 26. As best illustrated in Figure 2, the connecting arms will form an angle 74 which opens towards the rear and the downward tension from the metal springs will prevent the push rod 6 from spontaneously disengaging the plate 18 from the electrical contact points 22, 24.
If the vehicle operator wishes thereafter to disengage the safety or other devices, or to reset the inertia switch, the ~7~3 -- 10 _ operator may use the manipulating means 10 to urge the push rod 6 to the first stable position illustrated in Figure 1.
It will be appreciated by those skilled in the art that variations of the preferred embodiment described herein may be practiced without departing from the essence of the invention.
For example, the means for holding the push rod 6 in its rearwardmost or forwardmost extents, which in the preferred embodiment consists of the combination of pivoting connecting arms and metal springs, may instead conslst any suitable means attached about the push rod which are capable of effecting a transition between a first stable state and a second stable state.
Similarly, the means for completing the electrical circuit 26, which in the preferred embodiment consists of a contact plate 18, may instead consist of any suitable arrangement of components known to those skilled in the art.
FIELD OF THE INVENTION
This invention relates to inertia switches.
More particularly, this invention relates to an inertia switch for activating the hazard lights of a vehicle upon impact or severe deceleration.
BACKGROUND OF THE INVENTION
~ .. . . . . ~
In the event of motor vehicle accidents, it is desirable to have automatic means for activating various safety features of the vehicle. The same need arises in relation to other means of transportation such as aircraft.
Canadian Patent 522,231, which issued February 28, 1986 to the Pyree and Company, discloses an inertia switch for an aircraft to provide for the autornatic activation and control of apparatus such as fire extinguishers. The inertia switch of the Pyree and Company patent comprises housing and contact surfaces which are spaced a short distance apart under normal conditions.
One of the contact surfaces is in the shape of a disk. The other contact surface is in the form a cup, which partly surrounds the disk but does not touch it when the vehicle is at rest. The contacts are carried on supports with differing moments of`
inertia such that under conditions of constant deceleration, the contacts will not rneet, but in the event of higher differentials ~7~
~f velocity, such as the case of a collision, the displacement of the disk and the surrounding cup will vary with respect to one another such that the disk will come into contact with the cup thus establishing an electrical connection.
Canadian Patent 809,825 whic`n was issued April 1, 1969 to Paonessa, discloses an inertia switch involving a heavy metal ball and a spring. The metal ball is positioned within a metal cage in an enclosure which extends parallel to the direction of travel of the vehicle. A spring urges the metal cage towards the rear end of the enclosure. An electrical contact is provided at the forward end of the enclosure. Upon rapid deceleration such as in the case of a co].lision, the forward inertia of the heavy metal ball urges the cage forward against the spring and into contact with the electrical contact thus activating a warning systesn for any vehicles behind the decelerating vehicle.
Canadian Patent 998,138 issued October 5, 1976 to Nissan Motor Company Limited discloses a trigger switch mechanisrn for airbags in a vehicle. The mechanism consists of an arcuate member made of piezoelectric material held in position at one end of a casing and a weight movably supported against the inner surface of the arcuate rnember by a spring. Two electrical terminals are connected at opposite ends of the piezoelectric ~7~3 material. In the event of rapid deceleration, the inertia of the weight exerts pressure on the piezoelectric material thus inducing a voltage response between two terminals proportional to the pressure. The proportional voltage is used to control the activation of the airbags in the event of a collision.
Each of the patents referred to above discloses a mechanisrn for automatically enabling a contact switch in the event of a collision. However, none of the patents describes a inertia switch which may be manually operated at the discretion of the vehicle operator. In the case of hazard lights for example, it is desirable that in the event of rapid deceleration or collision, the hazard lights would be autornatically enabled, but that they would otherwise be subject to manual operation by the vehicle operator. Moreover, it is desirable in such circumstances as a collision that means be provided for ensuring that the inertia switch will remain engaged until disabled by the vehicle operator.
OBJECTS OF THE INVENTION
It is therefore an object of the present inventinn to provide an automatic inertia switch which may be manually activated.
~27~
,, It is a further object of this invention to provide an automatic inertia switch which will remain activated after a collision until manually deactivated.
It is yet a further object of the invention to provide such an aukomatic inertia switch which is simple in construction and which may be fitted to the dashboard of a motor vehicle.
SUMMARY OF THE_INVENTION
The inertia switch of the present invention comprises an elongated member slidably extending through the dashboard of a vehicle such that the longitudinal axis of the member is substantially parallel to the direction of travel of the vehicle.
One end of the member is provided with manipulating means and the opposite end of the member is provided with rneans for completing an electrical circuit when the member is slid to its forwardmost extent. Means extend between the member and a fixed point on the frame of the vehicle, said means being capable of assuming a first stable state in which the member is urged rearwardly and a second stable state in which the member is urged towards it forwardmost extent, said means further being capable of effecting a transition from the first state to the second state when the vehicle is subjected to rapid deceleration and from the second ~ ;27~
state to the first state when the member is pulled rearward by said manipulating means.
FIGURES
The invention may be more fully appreciated by reference to the illustrations and description of a preferred embodiment of the invention, in which:
Figure 1 is a side elevation of the invention wherein the elongated member is in its rearward configuration.
Figure 2 is a side elevation of the invention wherein the elongated member is in its forwardmost position.
Figure 3 is a sectional view taken along line 3-3 of Figure ~' 2.
DETAILED DESCRIPTION OF THE PRE~ERRED EMBODIMENT
Referring to Figure 1, the dashboard of a vehicle is designated by the numeral 1. The forward direction of travel of the vehicle is indicated by arrow 2 while the rearward direction of travel is indicated by arrow 1~.
`` ~.2~
A backplate 5 is secured by bolts 7 and 9 to the back of the dashboard 1.
A bushing 8, which may be of nylon or other suitable material is mounted integrally with backplate 5. A cylindrical elongated push rod 6 extends through the bushing 8 in a direction parallel to the direction of travel of the vehic:Le. The push rod 6 is adapted to slide through the bushing 8 along the push rod's longitudinal extent.
Manipulating means 10 are provided at the rearward end 12 of the push rod 6 whereby the vehicle operator may slide the push rod 6 forward or rearward as desired, as more fully discussed below.
The forward end 1ll of the push rod 6 is provided with means 16 to complete an electrical circuit when the push rod 6 is slid to its forwardmost extent, as illustrated in Figure 2. In the preferred embodiment described herein, such means 16 consists of an electrically conduct:ive contact plate 18.
An electrical switch 20 is fixed to the vehicle in longitudinally spaced relation with respect to the push rod 6.
Electrical switch 20 includes electrical contact points 22 and ~7QS~3 24, which open to a circuit 26 adapted to operate safety lights, air bags, or other devices in the vehicle. Such devices will be activated when the push rod 6 is slid to its forwardmost extent thereby bringing the plate 18 into contact with the electrical contact points 22 and 24 to close the electrical circuit 26, as best illustrated in Figure 2.
As best illustrated in Figure 3, the push rod 6 is journaled laterally through its diameter as at 28. A shaft 30 is disposed through the journal 28. Shaft 30 is of a length greater than the diameter of the push rod 6 so as to accommodate a mass 32 which is secured to the push rod 6 about the journaled portion 28 thereof.
Still referring to Figure 3, each end 36, 38 of the shaft 30 acts as a fulcrum and securement point for a pair of rigid connecting arms 40, 42 (about left end 36 of shaft 30) and 44, 46 (about right end 38 of shaft 30). A lock pin 48 retains the shaf`t 30 in the journa]. 28.
It can therefore be seen that the mass 32 is sandwiched between the connecting arms L10, 42, and 4l1, 46 about the journaled portion 28 of the push rod 6.
- ~27~5~3 The pair of connecting arrns 40, 44 iS adapted to be pivoted about the ends 36, 38 of the shaft 30 independently of the pair of connecting arms 42, 46.
Connecting arms 40 and 44 curve towards each other to be pivotally secured to one end 48 of a first metal spring 50 by means of a shaft 52. Similarly, connecting arms 42 and 46 curve towards each other to be pivotally secured to one end 54 of the second spring 56 by means of a shaft 58.
In the preferred embodiment described herein, the metal springs 50 and 56 are made of flat elongated strips of resilient and flexible metal. As best illustrated in Figure 1, the other ends 60 and 62 of the metal springs 50, 56 respectively are secured to the backplate 5 by rivets 64, 66, 68, 70.
The operation of the invention is as follows. In normal operation of the vehicle, the push rod 6 is urged rearward by the connecting arms which form an angle 72 with the push rod 6 which angle ol)ens towards the front of the vehicle. In this state, the tension induced by the curvature of the metal springs 50 and 56 maintains an inward pressure on the connecting arms which tends to reduce the angle 72 and thereby urges the push rod 6 rearward.
In this stable state, the contact plate 18 is not in contact with ~7~543 the electrical contact points 22 and 24 and the circuit 26 remains open.
When the vehicle undergoes rapid deceleration, as in the event of a collision, the momentum of the mass 32 will urge the push rod 6 forward thus forcing the connecting arms to overcome the tension in metal springs 50 and 56 and to pivot about the shaft 30 to a new stable position wherein the push rod is slid to its forwardmost extent as illustrated in Figure 2. The mass 32 must be chosen so that its momentum will overcome the metal springs 50, 56 in such circumstances.
In this new stable state, the plate 18 is in contact with electrical contact points 22, 24 thereby closing circuit 26 and activating the safety and other devices which are connected to the circuit 26. As best illustrated in Figure 2, the connecting arms will form an angle 74 which opens towards the rear and the downward tension from the metal springs will prevent the push rod 6 from spontaneously disengaging the plate 18 from the electrical contact points 22, 24.
If the vehicle operator wishes thereafter to disengage the safety or other devices, or to reset the inertia switch, the ~7~3 -- 10 _ operator may use the manipulating means 10 to urge the push rod 6 to the first stable position illustrated in Figure 1.
It will be appreciated by those skilled in the art that variations of the preferred embodiment described herein may be practiced without departing from the essence of the invention.
For example, the means for holding the push rod 6 in its rearwardmost or forwardmost extents, which in the preferred embodiment consists of the combination of pivoting connecting arms and metal springs, may instead conslst any suitable means attached about the push rod which are capable of effecting a transition between a first stable state and a second stable state.
Similarly, the means for completing the electrical circuit 26, which in the preferred embodiment consists of a contact plate 18, may instead consist of any suitable arrangement of components known to those skilled in the art.
Claims (3)
1. In a vehicle which has a front and a rear and which includes a frame, a dashboard, and an electrical circuit, an inertia switch comprising an elongated member having a rearward and a forward ends, said elongated member slidably extending through the dashboard such that the longitudinal axis of said elongated member is substantially parallel with the direction of travel of the vehicle, the rearward end of said elongated member being provided with means for manipulating said elongated member, the forward end of said elongated member being provided with means for completing the said electrical circuit when the elongated member is slid to its forwardmost extent, and means extending between said elongated member and the frame of the vehicle, said means being capable of assuming a first stable state in which said elongated member is urged to its rearwardmost extent and a second stable state in which the said elongated member is urged to its forwardmost extent, said means further being capable of effecting a transition from said first state to said second state when the vehicle is subjected to rapid deceleration and from said second state to said first state when the said elongated member is urged rearwardly by said manipulating means.
2. The invention as in claim 1 wherein said means extending between said elongated member and the frame of the vehicle consists, in combination, of at least one metal arm and spring means, wherein one end of said metal arm is pivotally secured to a point about said elongated member so as to pivot in a common plane with the longitudinal axis of said elongated member, the other end of said metal arm being secured to one end of said spring means, the other end of said spring means being secured to said fixed point, said means being capable of assuming a first stable state in which said metal arm forms an angle with said longitudinal axis of said elongated member opening towards the front of the vehicle so as to urge the elongated member rearwardly, or a second stable state in which said metal arm forms an angle with said longitudinal axis of said elongated member which opening towards the rear of the vehicle so as to urge the elongated member forwardly.
3. The invention as in claim 2 wherein said spring means consist of a resilient, flexible strip of material, one end of said strip being secured to the rear of the dashboard and the other end of said strip being secured to said other end of said metal arm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000552368A CA1270543A (en) | 1987-11-20 | 1987-11-20 | Inertia switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000552368A CA1270543A (en) | 1987-11-20 | 1987-11-20 | Inertia switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1270543A true CA1270543A (en) | 1990-06-19 |
Family
ID=4136885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000552368A Expired CA1270543A (en) | 1987-11-20 | 1987-11-20 | Inertia switch |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1270543A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993003385A1 (en) * | 1991-08-07 | 1993-02-18 | Robert Bosch Gmbh | Acceleration sensor and process for its production |
-
1987
- 1987-11-20 CA CA000552368A patent/CA1270543A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993003385A1 (en) * | 1991-08-07 | 1993-02-18 | Robert Bosch Gmbh | Acceleration sensor and process for its production |
| US5415043A (en) * | 1991-08-07 | 1995-05-16 | Robert Bosch Gmbh | Acceleration sensor and process for its production |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |