GB2271024A - Circuit breaker - Google Patents
Circuit breaker Download PDFInfo
- Publication number
- GB2271024A GB2271024A GB9220203A GB9220203A GB2271024A GB 2271024 A GB2271024 A GB 2271024A GB 9220203 A GB9220203 A GB 9220203A GB 9220203 A GB9220203 A GB 9220203A GB 2271024 A GB2271024 A GB 2271024A
- Authority
- GB
- United Kingdom
- Prior art keywords
- piston
- ball
- circuit breaker
- abutment means
- body part
- 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.)
- Withdrawn
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Classifications
-
- 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
Landscapes
- Automotive Seat Belt Assembly (AREA)
Abstract
A circuit breaker has two electrically conductive pistons 25, 31, respectively slidable in two axially aligned passages 23, 63 in a body part. The body part has a chamber 13 composed of an outer endless portion 15 communicating with a central inner portion 17. The pistons are biassed under adjustable pre-loaded spring biasses towards respective stop-limited positions at which the piston crown surfaces, 29,75 each of which has a concavity 27, 73 are spaced apart by an amount less than the diameter of an electrically conductive ball 35 releasibly located in the concavities. When the ball 35 is subjected to a force in excess of a certain value, the ball 35 rides up the walls of the concavities displacing the pistons against their spring pre-loads, to be ejected into the outer endless portion 15 so as to break the circuit between the pistons 25, 31, the pistons being thereafter driven back to their spaced stop-limited positions, which prevents the ball returning to the inner chamber portion 17. The circuit breaker may be used to isolate the battery of a vehicle in the event of the vehicle stopping abruptly. <IMAGE>
Description
Circuit Breakers
This invention relates to a novel circuit breaker and to electrical sytems of motor road vehicles incorporating such circuit breaker.
The eruption of a vehicle into fire is a major hazard in the event of generally severe motor vehicle collisions the danger arising fran the so-called fire triangle -.
spilt fuel, exhaust and electrical ignition of these highly combustible products.
It is a primary, though not exclusive, object of the invention to provide an electrical circuit breaker operable at sudden arrest of a vehicle, particularly from a high speed, and especially as a result of collision, to isolate the vehicle battery from the remainder of the vehicle electrical system.
According to the invention a circuit breaker carprises: a body part having a longitudinal axis and within which is a chamber composed of an otter endless cavity portion encompassing the said axis and a central cavity portion communicating with the said endless cavity portion around the boundary of the central cavity portion;
a wall portion of the said body part is pierced with an axially extensive passage leading to the said central cavity portion;
a piston part having a concavity in the crown surface thereof is axially movable along the said passage against an adjustably preloadable spring bias;
a reaction part located in the said body part with a reaction surface thereof which in confronting relationship to the said piston crown surface;;
stop means serving to limit the extent of axial movement as aforesaid of the said piston part such that the piston and reaction parts are prevented from making contact with one another; and
an electrically conductive ball resides releasibly trapped between the said said piston crown surface and the said reaction part surface with the ball partially received within the said concavity; and in which the ball has a diameter such that, trapped as aforesaid, an electrically conductive path is completed between first and second electrically conductive path segments, the one extending from the said piston part to a first and the other from the said reaction part to a second terminal fixed in the said body part; and
the spring preload then acting upon the ball is such that the electrically conductive path may be broken only by a force resultant of a magnitude not less than a certain value determined by the spring preload and any residual friction acting on the piston part, being a force resultant acting an the ball in a direction normal to the said axis; and
upon experiencing a force as aforesaid, the ball is expelled from its position between the said piston and reaction parts into the said endless cavity, the piston part riding up the said passage against the said spring preload as a result of the movement of the ball with respect to the surface of the said piston part concavity and the said stop means being effective, the ball being expelled, as aforesaid, to arrest the piston in its movement towards the reaction part.
Preferably, the said piston has a central metal core portion and a jacket of an insulative material around the said core portion.
Preferably, the said body part has:
an integral tubular portion extensive outwardly from the said body wall portion coaxially with the said passage;
an electrically conductive rod part integral with the said piston part extends within the said tubular portion from the said piston part; and
the means whereby the said piston part may be adjustably preloaded comprises abutment means axially adjustable within the said tubular portion and a compression spring which bears at one end against the said piston part and at the other against the said abutment means.
Preferably, the means whereby the said second piston part may be adjustably preloaded comprises second abutment means axially adjustable within the said tubular portion and a second carpression spring which bears at one end against the said second piston part and at the other against the said second abutment means.
Preferably, the said stop means comprises: second abutment means located within the said tubular portion to the side of the said first abutment means remote from the said piston; and
third abutment means fixed with respect to the said rod part; and the location of the said second abutment means with respect to the first and the location of the third abutment means along the said rod part are such that at expulsion of the said ball, as aforesaid, movement of the said rod part and, hence, of the piston part is limited by contact of the movable third abutment means with the second.
Preferably, the said first terminal is constituted by the free end of the tubular portion and the free end of the said rod part.
Preferably, a second wall portion of the said body part, being a wall part opposed to the said said first wall portion is pierced with an axially extensive seond passage leading to the said central cavity portion; and
the said reaction part is constituted as a second piston part having a concavity in the crown surface thereof and being axially movable along the said second passage against an adjustably preloadable spring bias.
Preferably, the said body part has a second integral tubular portion extensive outwardly from the said second body part wall portion coaxially with the said second passage; and
a second electrically conductive rod part integral with the said second piston part extends within the said second tubular portion from the said second piston part.
Preferably, the circuit breaker has:
stop means serving to limit the extent of axial movement as aforesaid of the said second piston part such that the piston and reaction parts are prevented from making contact with one another; and
the means whereby the said second piston part may be adjustably preloaded comprises: abutment means axially adjustable within the said second tubular portion and a second compression spring which bears at one end against the said second piston part and at the other against the said abutment means.
Preferably, the last mentioned stop means corprises: second abutment means located within the said tubular portion to the side of the said first abutment means remote from the said second piston; and
third abutment means fixed with respect to the said second rod part; and the location of the said second abutment means with respect to the first and the location of the third abutment means along the said second rod part are such that at expulsion of the said ball, as aforesaid, movement of the said second rod part and, hence, of the piston part is limited by contact of the movable third abutment means with the second.
Preferably, the said second terminal is constituted by the free end of the said second tubular portion and the free end of the said second rod part.
Preferably, the said second piston part has a central metal core portion and a jacket of an insulative material around the said core portion.
Preferably, said body part is of an electrically insulative material.
Preferably, the said body part has first and second coMponent body parts, part of the chamber within the said body part being in one body part ccrAs ent and the remainder of the said chamber being within the other body part coMponent;
Preferably, the two said body part components have planar boundary surfaces;
releasible threaded fasteners secure the said two body part components together with the said boonary surfaces thereof in confronting one another; and
a sealing ring member is located within opposed endless grooves formed in the said opposed surfaces.
According to the invention, also, an electical system for a motor road vehicle employing readily earbustible fuel in the propulsion thereof which has, between the vehicle electrical battery and the wiring harness leading therefrom, a circuit breaker as set forth in any of the preceding paragraphs, the said circuit breaker being supported with the said longitudinal axis substantially vertical, and the spring preload or preloads, as the case may be, acting on the said ball being set to a value calculated to permit the said ball to be expelled from its otherwise trapped position under the impulse experienced by the ball in the event of vehicle being arrested abruptly, as at the occurence of a severe collision.
The foregoing and other features of the invention are hereinafter described with reference to the accompanying drawings in which:
Fig. 1 shows the circuit breaker in side elevation;
Fig. 2 shows the circuit breaker of Fig. 1 in plain; Fig. 3 shows on an enlarged scale a longitudinal section through the circuit
breaker of Figs. 1 and 2; and
Figs. 4 and 5 are diagrams respectively showing in longitudinal section the circuit breaker before and after impact.
The circuit breaker comprises: a body part II having a longitudinal axis A- A and within which is a chamber 13 composed of an outer endless cavity portion 15 encompassing the said axis A A and a central cavity portion 17 comTunicating with the said endless cavity portion 15 around the boundary 19 thereof.
A wall portion 21 of the body 1l is pierced with an axially extensive passage 23 leading to the said central cavity portion 17;
A piston part 25 having a concavity 27 in the crown surface 29 thereof is axially movable along the passage 23 against an adjustably preloadable spring bias.
A reaction part 31 is located in the said body 11 with a reaction surface 33 thereof in confronting relationship with the said piston crown surface 29; and an electrically conductive ball 35 resides releasibly trapped between the piston crown surface 29 and the said reaction part surface 33 with the ball 35 partially received within the concavity 27.
The ball 35 has a diameter such that, trapped as aforesaid, an electrically conductive path is carpeted between first and second electrically conductive path segrents 37,39, respectively, the one 37 extending from the said piston part 25 to a first 41 and the other from the said reaction part 31 to a second 43 terminal fixed in the body 1l.
The spring preload acting upon the ball 35 is such that the electrically conductive path may be broken only by a force resultant F of a magnitude not less than a certain value determined by the spring preload and any residual friction acting on the piston part, being a force resultant acting on the ball in any direction normal to the said axis A-A.
Upon experiencing a force resultant F as aforesaid, the ball 35 is expelled from its position between the said piston and reaction parts 25,31, into the endless cavity portion 15, the piston part 25 riding up the passage 23 against the said spring preload as a result of the movement of the ball 35 with respect to the surface of the said piston part concavity 27.
Considering the construction of the circuit breaker in greater detail, the piston part 25 has, for a reason to be mentioned hereinafter, a central metal core portion 45 and a jacket 47 of an insulative material, nylon say, therearound.
The body 1l has an integral tubular portion 49 extensive outwardly from the body wall portion 21 axially with the passage 23; an electrically conductive rod part 51 integral with the piston part 25 extends within the tubular portion 49 from the piston part 25; and the means whereby the said piston part may be adjustably preloaded Knprises abutment means 53, in the form of a disc 53b, the boundary of which is in threaded engagement with the threaded inner surface of the wall of the tubular portion 49 and which, hence, is axially adjustable within the said tubular portion 49; and a impression spring 55 and spring cup 55a which bears at one end, the spring cup end, against the said piston part 25 and at the other against the said abutment means 53.
Additionally, there is provided stop means serving to limit the extent of axial movement as aforesaid of the said piston part such that the piston and reaction parts 25, 31, are prevented from raking contact with one another. The stop means carprises a second dise 53b which, like the disc 53a, is in threaded engagfrErt with the inner surface of the tubular portion 49, and on the rod part 51 an abutment in the form of a circlip 53c fixed with respect to the said rod by being sprig into a circumferential groove therearound. To enhance the action of the circlip 53c there is provided, between the circlip and the dise 53b, a washer 53d loose on the rod part 51.
The aforesaid stop means serves, absent a ball 35 between the piston and reaction parts 25, 31, to limit the travel of the piston part 25 towards the reaction part 31, the piston part being arrested by contact between the washer 53d and the disc 53b, the circlip 53e acting as a backstop to the washer 53d. At the limit the position of the piston part 25 with respect to the reaction part 31 is represented at (b) of Fig.4 from which it should be noted that the space between the piston and reaction parts is less than the diameter of the ball 35.
The first terminal 41 is constituted by the free end 57 of the tubular portion and the serrated free and 59 of the rod part 51.
A second wall portion 61 of the said body part 1l, being a wall portion opposed to the said first wall portion 21 is pierced with an axially extensive second passage 63 leading to the said central cavity portion 17.
The body 1l has a second integral tubular portion 65 extensive outwardly from the second body wall portion 61 coaxially with the secant passage 63; and a second electrically conductive rod part 67 integral with the reaction part 31 extends within the said second tubular portion 65.
The second terminal 43 is constituted by the free end 69 of the second tubular portion 65 and the serrated free end 71 of the second rod part 67.
The reaction part 31 is constituted as a second piston part having a concavity 73 in the croon surface 75 thereof and being axially movable along the second passage 63 against an adjustably preloadable spring bias.
As with the first piston part 25 so, too, the said secand piston part 31 has a central metal core portion 77 and a jacket 79 of an insulative material therearound.
The means whereby the second piston part 31 may be adjustably pre1oac carprises as with the correspmdng means associated with the first piston part 25, abutment means 81, specifically, as with the abutment means 53, a dise 81a threaded engagement with the inner surface of the second tubular portion 65 so as to be axially adjustable therewithin, and a second compression spring 83 and spring cup 83a which bears at one end, the spring cup end, against the second piston part 31 and at the other against the second abutment means.
As with the first piston part 25, the second piston part 31 has stop means carprising a dise 81b in threaded engagement with the inner surface of the tubular portion 65, a loose washer Blc and a circilip 81d located in a circunferential groove around the rod 67.
The operation of the means for applying a preloaded spring bias to the piston part 31 and the operation of the stop means associated with the second piston part, are as described in connection with the corresponding means associated with the first piston part 25.
The body 11 is of a robust electrically insulative material, typically polypropylene or ABS.
The body 1I has first and second body parts 85,87, respectively, part 13a of the chamber 13 being in one body part 85 and the remainder 13b being within the other body part 87. The two body parts 85,87, have planar end surfaces 89,91, respectively; releasible threaded fasteners 93 secure the said two body parts together with the said end surfaces 89,9l,thereof confronting one another; and a sealing ring member 95 is located within opposed endless grooves 97,99, respectively, formed in the said opposed surfaces 89,91, respectively. The ring seal 95 and rubber gaiters 101,103, ensure that the circuit breaker is tight against the ingress of liquids, water primarily.
In use, in a motor road vehicle, a circuit breaker, as hereinbefore described, is munted in the vehicle with the axis A-A thereof substantially vertical. The circuit breaker is connected between the vehicle battery (not shown) and the heavy duty section of the vehicle wiring loan, electrical connections being made to the terminals 41,43, at the free ends of the tubular portions 49,65. The serratims at the free ends of the rods 59, 71 assist in the formation of a good electrical current path throgh the circuit breaker.
In the event of an impact as in a collision with another vehicle such that the vehicle is brought abruptly to rest from a high speed, in excess, say, of 50 m.p.h.
the impulse acting on the ball 35 causes the trapped be ejected into the endless cavity 15, the piston parts 25, 31, being first forced apart as the ball 35 rides out of the piston part concavities, and thereafter driven towards one another under the action of the preloaded compression springs 55,83, until limited from further such movement by the abutment means respectively associated with the piston parts.
The ejection of the ball 35 immediately interrupts the supply of heavy current from the battery thereby avoiding the risk of ignition of fuel likely to be present in the circumstances of the accident.
The limited space between the tho piston parts after ejection of the ball 35 excludes any possibility of the ball regaining the trapped position; and the presence of the insulative jackets 47,79, around the metal core parts 45,77, of the piston parts prevents the establistment of an electrically conductive path by contant of the ball with the said metal cores.
Claims (8)
1. A circuit breaker comprises: a body part having a longitudinal axis and within which is a chamber composed of an outer endless cavity portion emarpassing the said axis and a central cavity portion communicating with the said endless cavity portion around the boundary of the central cavity portion;
a wall portion of the said body part is pierced with an axially extensive passage leading to the said central cavity portion;
a piston part having a concavity in the crown surface thereof is axially movable along the said passage against an adjustably preloadable spring bias;
a reaction part located in the said body part with a reaction surface thereof which in confronting relationship to the said piston crown surface;;
stop means serving to limit the extent of axial movement as aforesaid of the said piston part such that the piston and reaction parts are prevented fran making contact with one another; and
an electrically conductive ball resides releasibly trapped between the said said piston crown surface and the said reaction part surface with the ball partially received within the said concavity; and in which the ball has a diameter such that, trapped as aforesaid, an electrically conductive path is completed between first and second electrically conductive path segents, the one extending fran the said piston part to a first and the other fram the said reaction part to a second terminal fixed in the said body part; and
the spring preload then acting upon the ball is such that the electrically conductive path may be broken only by a force resultant of a magnitude not less than a certain value determined by the spring preload and any residual friction acting on the piston part, being a force resultant acting on the ball in a direction mrmal to the said axis; and
upon experiencing a force as aforesaid, the ball is expelled fran its position between the said piston and reaction parts into the said endless cavity, the piston part riding up the said passage against the said spring preload as a result of the movement of the ball with respect to the surface of the said piston part concavity and the said stop means being effective, the ball being expelled, as aforesaid, to arrest the piston in its movement towards the reaction part.
2. A circuit breaker as claimed in claim 1 in which the said piston has a central metal core portion and a jacket of an insulative material around the said core portion.
3. A circuit breaker as claimed in claim 1 or 2 in which:
the said body part has an integral tubular portion extensive outwErdly fron the said body wall portion coaxially with the said passage;
an electrically conductive rod part integral with the said piston part extends within the said tubular portion fran the said piston part; and
the means whereby the said piston part may be adjustably preloaded carprises abutment means axially adjustable within the said tubular portion and a compression spring which bears at one end against the said piston part and at the other against the said abutment means.
4. A circuit breaker as claimed in claim 3 in which: the means whereby the said second piston part may be adjustably preloaded comprises second abutment means axially adjustable within the said tubular portion and a second carpression spring which bears at one end against the said second piston part and at the other against the said second abutment means.
5. A circuit breaker as claimed in claim 2, 3 or 4 and in which the said stop means carprises:
second abutment means located within the said tubular portion to the side of the said first abutment means remote fran the said piston; and
third abutment means fixed with respect to the said rod part; and the location of the said second abutment means with respect to the first and the location of the third abutment means along the said rod part are such that at expulsion of the said ball, as aforesaid, movement of the said rod part and, hence, of the piston part is limited by contact of the movable third abutment means with the second.
6. A contact breaker as claimed in any of claims 3, 4 or 5 in which the said first terminal is constituted by the free end of the tubular portion and the free end of the said rod part.
7. A circuit breaker as claimed in any of claims 3 to 6 in which:
a second wall portion of the said body part, being a wall part opposed to the said said first wall portion is pierced with an axially extensive second passage leading to the said central cavity portion; and
the said reaction part is constituted as a second piston part having a concavity in the crown surface thereof and being axially movable along the said second passage against an adjustably preloadable spring bias.
8. A circuit breaker as claimed in claim 7 in which:
the said body part has a second integral tubular portion extensive outwardly from the said second body part wall portion coaxially with the said seond passage; and
a second electrically conductive rod part integral with the said second piston part extends within the said send tubular portion from the said second piston part.
8. A circuit breaker substantially as hereinbefore described with reference to the accompanying drawings.
8. A circuit breaker as claimed in claim 7 which has;
stop means serving to limit the extent of axial movement as aforesaid of the said second piston part such that the piston and reaction parts are prevented from making contact with one another; and in which
the means whereby the said second piston part may be adjustably preloaded comprises: abutment means axially adjustable within the said second tubular portion and a second corrpression spring which bears at one end against the said second piston part and at the other against the said abutment means.
9. A circuit breaker as claimed in claim 7 or 8 in which the said stop means comprises: second abutment means located within the said tubular portion to the side of the said first abutment means remote from the said second piston; and
third abutment means fixed with respect to the said second rod part; and the location of the said second abutment means with respect to the first and the location of the third abutment means along the said second rod part are such that at expulsion of the said ball, as aforesaid, movement of the said second rod part and, hence, of the piston part is limited by contact of the movable third abutment means with the second.
10. A circuit breaker as claimed in any of claims 7, 8 or 9 in which the said second terminal is constituted by the free end of the said second tubular portion and the free end of the said second rod part.
II. A circuit breaker as claimed in any of claims 7 to 10 in which the said second piston part has a central metal core portion and a jacket of an insulative material around the said core portion.
12. A circuit breaker as claimed in any of preceding claim in which the said body is of an electrically insulative material.
13. A circuit breaker as claimed in any preceding claim in which:
the said body part has first and second component body parts, part of the chamber within the said body being in one body part component and the remainder of the said chamber being within the other body part carponent;
the two said body part components have planar boundary surfaces;
releasible threaded fasteners secure the said two body part components together with the said boundary surfaces thereof in confronting one another; and
a sealing ring member is located within opposed endless grooves forced in the said opposed surfaces.
14. An electical system for a motor road vehicle employing readily ccobustible fuel in the propulsion thereof which has, between the vehicle electrical battery and the wiring harness leading therefrom, a circuit breaker as claimed in any preceding claim, the said circuit breaker being supported with the said longitudinal axis substantially vertical, and the spring preload or preloads, as the case may be, acting on the said ball being set to a value calculated to permit the said bell to be expelled fran its otherwise trapped position under the irpalse experienced by the ball in the event of vehicle being arrested abruptly, as at the occurence of a severe collision.
15. A circuit breaker substantially as hereinbefore described with reference to the accompanying drawings.
Amendments to the claims have been filed as follows
CLAIMS 1. A circuit breaker which comprises:
a body part formed with a chamber composed of an outer endless cavity portion encompassing an axis fixed in said body part and, within said outer cavity portion, an inner cavity portion which communicates around its entire boundary with said endless cavity portion, and having first and second opposed wall portions respectively pierced with first and second axially extensive passages each leading to said inner cavity portion;
first and second electrically conductive piston parts respectively axially movable along said first and second passages and having first and second concavities, respectively, in the confronting crown surfaces thereof;;
first and second stop means effective to define inward limits of displacement for said first and second piston parts, respectively, whereby said piston crown surfaces are prevented, at all times, from making contact with one another;
first and second spring arrangements whereby said piston parts are respectively resiliently biased towards said limiting positions;
first and second means respectively operable to maintain said spring arrangements each under an adjustably preloadable spring bias; and,
an electrically conductive ball held between the first and second piston crown surfaces, within and projecting from said concavities, the diameter of said ball being such that said crown surfaces are displaced along said axially extensive passages of said opposed wall portions, outwardly away from said positional limits, against their respective spring biases; and in which:
the form of said chamber is such that, with the ball held as aforesaid in said piston crown surface concavities, an electrically conductive path is thereby completed between said piston parts; and,
the spring preloads acting upon the ball are such that the electrically conductive path may be broken only by a force of a magnitude not less than a certain value determined by the spring preloads and any residual friction acting on the piston parts, being a force acting on the ball in a direction normal to the said axis;;
upon experiencing a force as aforesaid, the ball is expelled from its position between the piston part crown surfaces from the inner into the endless outer cavity, the piston parts riding up their respective said axially extensive passages against their spring preloads, as a result of the movement of the ball with respect to the surfaces of the piston part concavities; and,
the ball being so expelled, the piston parts are arrested against movement towards one another by said stop means with said piston crown surfaces held apart displaced with respect to one another by an amount such that the ball is not able to pass from the outer to the inner cavity portion.
2. A circuit breaker as claimed in claim 1 in which the said piston has a central electrically conductive core portion and a jacket of an insulative material around the said core portion.
3. A circuit breaker as claimed in claim 1 or 2 in which: said body part has first and second tubular portions integral with said body, being tubular portions respectively extensive outwardly from said body wall portions coaxially with the said passages, and first and second electrically conductive rod parts respectively integral with said piston parts to extend respectively within said first and second tubular portions from said piston parts; and,
the first and second means whereby said piston parts may be respectively adjustably preloaded each comprise: abutment means axially adjustable within a said tubular portion and a compression spring which bears at one end against a said piston part and at the other against the associated said abutment means.
4. A circuit breaker as claimed in any preceding claim and in which each said stop means comprises:
second abutment means located within the said tubular portion to the side of the said first abutment means remote from the said piston; and
third abutment means fixed with respect to the said rod part; and the location of the said second abutment means with respect to the first and the location of the third abutment means along the said rod part are such that at expulsion of the said ball, as aforesaid, movement of the said rod part and, hence, of the piston part is limited by contact of the movable third abutment means with the second.
5. A contact breaker as claimed in any of claims 3, 4 or 5 in which each said terminal is constituted by the free end of a tubular portion and the free end of a rod part.
6. A circuit breaker as claimed in any preceding claim in which:
said body part has first and second component body parts, part of the chamber within the said body being in one body part component and the remainder of the said chamber being within the other body part component;
the two said body part components have planar boundary surfaces;
releasible threaded fasteners secure the said two body part components together with the said boundary surfaces thereof in confronting one another; and a sealing ring member is located within opposed endless grooves formed in the said opposed surfaces.
7. An electical system for a motor road vehicle employing readily combustible fuel in the propulsion thereof which has, between the vehicle electrical battery and the wiring harness leading therefrom, a circuit breaker as claimed in any preceding claim, the said circuit breaker being supported with the said longitudinal axis substantially vertical, and the spring preloads, as the case may be, acting on the said ball being set to a value calculated to permit the said ball to be expelled from its otherwise trapped position under the impulse experienced by the ball in the event of vehicle being arrested abruptly, as at the occurence of a severe collision.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9220203A GB2271024A (en) | 1992-09-24 | 1992-09-24 | Circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9220203A GB2271024A (en) | 1992-09-24 | 1992-09-24 | Circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9220203D0 GB9220203D0 (en) | 1992-11-04 |
| GB2271024A true GB2271024A (en) | 1994-03-30 |
Family
ID=10722448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9220203A Withdrawn GB2271024A (en) | 1992-09-24 | 1992-09-24 | Circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2271024A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3597125A1 (en) * | 2006-05-19 | 2020-01-22 | Ethicon Endo-Surgery, Inc. | Force switch |
| US10675022B2 (en) | 2006-05-19 | 2020-06-09 | Ethicon Llc | Electrical surgical instrument with optimal tissue compression |
| US11172931B2 (en) | 2006-05-19 | 2021-11-16 | Cilag Gmbh International | Electrically self-powered surgical instrument with cryptographic identification of interchangeable part |
| US11172930B2 (en) | 2005-07-26 | 2021-11-16 | Cilag Gmbh International | Electrically self-powered surgical instrument with manual release |
| US11234695B2 (en) | 2005-07-26 | 2022-02-01 | Cilag Gmbh International | Surgical stapling and cutting device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB801897A (en) * | 1954-11-29 | 1958-09-24 | Phoenix Telephone & Electric W | Emergency lighting unit |
| GB1355969A (en) * | 1970-11-10 | 1974-06-12 | Lucas Industries Ltd | Electric switches |
| GB1366916A (en) * | 1970-09-21 | 1974-09-18 | Mitsubadenkiseisa Kusho Co Ltd | Safety device for vehicles |
-
1992
- 1992-09-24 GB GB9220203A patent/GB2271024A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB801897A (en) * | 1954-11-29 | 1958-09-24 | Phoenix Telephone & Electric W | Emergency lighting unit |
| GB1366916A (en) * | 1970-09-21 | 1974-09-18 | Mitsubadenkiseisa Kusho Co Ltd | Safety device for vehicles |
| GB1355969A (en) * | 1970-11-10 | 1974-06-12 | Lucas Industries Ltd | Electric switches |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11172930B2 (en) | 2005-07-26 | 2021-11-16 | Cilag Gmbh International | Electrically self-powered surgical instrument with manual release |
| US11234695B2 (en) | 2005-07-26 | 2022-02-01 | Cilag Gmbh International | Surgical stapling and cutting device |
| EP3597125A1 (en) * | 2006-05-19 | 2020-01-22 | Ethicon Endo-Surgery, Inc. | Force switch |
| US10586669B2 (en) | 2006-05-19 | 2020-03-10 | Ethicon-Endo Surgery, Inc. | Force switch |
| US10675022B2 (en) | 2006-05-19 | 2020-06-09 | Ethicon Llc | Electrical surgical instrument with optimal tissue compression |
| US11172931B2 (en) | 2006-05-19 | 2021-11-16 | Cilag Gmbh International | Electrically self-powered surgical instrument with cryptographic identification of interchangeable part |
| US11183349B2 (en) | 2006-05-19 | 2021-11-23 | Ethicon Endo-Surgery, Inc | Force switch |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9220203D0 (en) | 1992-11-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |