GB2356608A - Semi-trailer assembly - Google Patents
Semi-trailer assembly Download PDFInfo
- Publication number
- GB2356608A GB2356608A GB0028779A GB0028779A GB2356608A GB 2356608 A GB2356608 A GB 2356608A GB 0028779 A GB0028779 A GB 0028779A GB 0028779 A GB0028779 A GB 0028779A GB 2356608 A GB2356608 A GB 2356608A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wheels
- semi
- trailer
- fluid
- trailer assembly
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
- B60G17/04—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics
- B60G17/052—Pneumatic spring characteristics
- B60G17/0523—Regulating distributors or valves for pneumatic springs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/015—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements
- B60G17/0152—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by the action on a particular type of suspension unit
- B60G17/0155—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by the action on a particular type of suspension unit pneumatic unit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D53/00—Tractor-trailer combinations; Road trains
- B62D53/04—Tractor-trailer combinations; Road trains comprising a vehicle carrying an essential part of the other vehicle's load by having supporting means for the front or rear part of the other vehicle
- B62D53/06—Semi-trailers
- B62D53/067—Multi-purpose, convertible or extendable load surface semi-trailers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D61/00—Motor vehicles or trailers, characterised by the arrangement or number of wheels, not otherwise provided for, e.g. four wheels in diamond pattern
- B62D61/12—Motor vehicles or trailers, characterised by the arrangement or number of wheels, not otherwise provided for, e.g. four wheels in diamond pattern with variable number of ground engaging wheels, e.g. with some wheels arranged higher than others, or with retractable wheels
- B62D61/125—Motor vehicles or trailers, characterised by the arrangement or number of wheels, not otherwise provided for, e.g. four wheels in diamond pattern with variable number of ground engaging wheels, e.g. with some wheels arranged higher than others, or with retractable wheels the retractable wheel being a part of a set of tandem wheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
- B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
- B60G2204/47—Means for retracting the suspension
- B60G2204/4702—Means for retracting the suspension pneumatically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2300/00—Indexing codes relating to the type of vehicle
- B60G2300/04—Trailers
- B60G2300/042—Semi-trailers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2300/00—Indexing codes relating to the type of vehicle
- B60G2300/40—Variable track or wheelbase vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2600/00—Indexing codes relating to particular elements, systems or processes used on suspension systems or suspension control systems
- B60G2600/20—Manual control or setting means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2600/00—Indexing codes relating to particular elements, systems or processes used on suspension systems or suspension control systems
- B60G2600/21—Self-controlled or adjusted
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
- B60G2800/01—Attitude or posture control
- B60G2800/019—Inclination due to load distribution or road gradient
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
- B60G2800/22—Braking, stopping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
- B60G2800/24—Steering, cornering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
- B60G2800/90—System Controller type
- B60G2800/91—Suspension Control
- B60G2800/915—Suspension load distribution
Description
2356608 1 1 SEMI-TRAILER ASSEMBLY 2 3 This invention relates to a
semi-trailer assembly which 4 is adapted to be towed by a prime mover. 5 6 One problem with extending skeletal trailers is that 7 under certain circumstances e.g. during downloading and 8 unloading, the centre of gravity of the load can be to 9 the rear of the centre of support of the wheels of the 10 trailer, with the result that the trailer tends to lift 11 the rear of the prime mover. This can, for example, 12 render the prime mover difficult to start or render it 13 difficult for the trailer to be manipulated. 14 15 One example of this is extending skeletal trailers, 16 where the trailer can be extended and retracted in the 17 longitudinal direction of the trailer in order to 18 accommodate a range of standard containers. However, 19 extension or retraction of the trailer will also alter 20 the centre of gravity relative to the king pin.
2 1 Previously, it has been common pra,.-,tice to overcome 2 such problems by providing means fcr lifting the 3 forward pair of wheels clear of the ground, with the 4 result that the trailer is support(.d by the remaining 5 pairs of wheels. The effect of raising the forward 6 pair of wheels is to move the centre of support for the 7 trailer rearwardly. 8 9 The disadvantage of raising the forward pair of wheels 10 clear of the ground is that the vel-icle combination of 11 trailer and drawing unit do not coi-.form to the current 12 construction and use regulations. 13 14 It is therefore an object of the p7__-esent invention to 15 provide a semi-trailer assembly which overcomes the 16 drawbacks of lifting wheels in a sJ_mple and economical 17 manner. 18 19 According to one aspect of the present invention, there 20 is provided a semi-trailer assembl,./ having a trailer 21 chassis and two or more pairs of wheels, at least the 22 one pair of wheels being supported by a pressurised 23 fluid system, wherein the pressure of the fluid in the 24 pressurised fluid system is indepei-a dent ly controllable 25 from the pressure of the fluid supporting any other 26 pairs of wheels. 27 28 The trailer assembly may involve two, three, four or 29 more pairs or sets of wheels. In one embodiment, the 30 trailer has three pairs of wheels arranged as a forward 31 pair and two rearward pairs for supporting the chassis 32 and any load thereon. The pressuri.sed fluid means may 3 1 be a hydraulic system, but is preferably a pressurised 2 air system. Preferably, each pair of wheels is 3 supported on a suspension system which includes a 4 container for pressurised air. 5 6 The pressurised fluid for such a multi-wheeled system 7 may be connectable, and preferably there is included 8 means for releasing the pressurised fluid, e.g. air, 9 solely from the (air) container of one, e.g. the 10 forward, pair of wheels. Release of pressure, e.g. by 11 venting to atmosphere, will result in the e.g. forward, 12 pair of wheels remaining in contact with a ground 13 surface but carrying no weight of the trailer chassis 14 and any load thereon. Applying the brakes to the 15 wheels of the trailer assembly could be by a separate 16 control valve to allow the trailer to be extended or 17 retracted. 18 19 The chassis may comprise two portions, which are 20 movable relative to each other in the longitudinal 21 direction of the trailer. Locking pins or other 22 catches are provided for locking the two portions in 23 one of a number of alternative positions. However, the 24 chassis may also be of static size. 25 26 A valve system could also be provided for supplying 27 pressurised air alternatively to the braking system and 28 to the system and/or means for releasing air. The 29 means for releasing air could comprise a valve such as 30 a pilot valve, especially a 3/2 pilot valve, a push 31 pull valve, an electrical solenoid valve, or an 32 electrical impulse valve.
4 2 In particular the invention relates --o a semi-trailer 3 assembly comprising a trailer chassis with three axles 4 and three pairs of wheels arranged as a forward pair 5 and one or more rearward pairs for supporting the 6 chassis and any load thereon, each pair of wheels being 7 supported on a connected suspension system which 8 includes a container for pressurisefl-i air, the semi9 trailer assembly including: 10 11 means for releasing the air solely from the air 12 container for the forward pair of wheels such that the 13 forward pair of wheels remains in contact with a ground 14 surface but carries no weight of thE:-, trailer chassis 15 and any load thereon; and means to Enable 16 depressurisation of the suspension system of the 17 forward pair of wheels in response to application of 18 the brakes of the wheels of the tra-ler assembly. 19 20 The means for releasing air may comprise a number of 21 valves. 22 23 Preferably the system can only be operated when the 24 park brake is operated (locking the trailer wheels) 25 This could allow pressurised air to flow to the 26 solenoid valve and pull valve. The pull valve could be 27 operated so as to divert air to valves which isolate 28 the front air bags and allows them to deflate without 29 affecting any other air bag. 30 1 For an extendable trailer, the trailer pins can be 2 retracted and the increased imposed load on the prime 3 mover enables the trailer to be extended.
4 The fluid in the system supporting the relevant pair of 6 wheels can be repressurised manually. Preferably, the 7 fluid is repressurised automatically, when desired or 8 necessary. This could be as a result of the service 9 brakes being applied a set number of times, (such that e.g. an electronic counter sends a signal to the 11 solenoid valve which then resets the system), or 12 because of a pre-determined speed of the trailer being 13 achieved. Repressurisation could be provided by 14 closing the venting air allowing the front air bags to inflate and reconnect them to any connected bags, eg 16 the other axle-supporting bags. The suspension system 17 should then revert to normal operation.
18 19 According to a second aspect of the present invention, there is provided a kit for application to a semi 21 trailer assembly having a trailer chassis and two or 22 more pairs of wheels, the pairs of wheels being 23 supported by a pressurised fluid system, wherein the 24 kit comprises means for allowing independent control of the pressure of the fluid supporting at least one of 26 the pairs of wheels.
27 28 Preferably the means comprises one or more valves which 29 can be incorporated into the pressurised fluid system to provide independent depressurisation and 31 repressurisation. of fluid supporting one, eg the most 32 forward, pair of wheels of the trailer.
6 2 The particular embodiments and features described 3 hereinbefore for the semi-trailer assembly apply 4 equally to means for the kit. The kit of the present invention should be usable with an' existing trailer 6 chassis and pressurised fluid suppc,:r?-- system.
7 8 For a better understanding of the present invention anal 9 to show more clearly how it may be carried into effect reference will now be made, by the way of example, to ii the accompanying diagrammatic illustration, Figure 1, 12 which shows one embodiment of part Of a semi-trailer 13 assembly according to the present invention.
14 is Semi-trailer assemblies of the extendible skeletal type 16 are well known in themselves and wilL not be described 17 in detail herein.
18 19 Such trailer assemblies all include a trailer chassis for supporting a load in the form of one or more 21 conventional containers and (genera-I..ly) three pairs of 22 wheels (17a,b,c) disposed towards the rear of the 23 trailer for supporting the chassis:.nd any load. The 24 wheels are provided with braking mec-hanisms, conventionally operated by compressed air, and with 26 suspension systems, again conventionally incorporating 27 containers for pressurised air.
28 29 Figure I is a diagrammatic illustrai::.ion of a three axle semi-trailer incorporating a forward axle (1) 31 supported by f orward air bags (3):_ mid axle (5) 32 supported by mid air bags (7) and a -rear axle (9) 7 1 supported by rear air bags (11). 2 3 Pressurised air is supplied to brakes (not shown) for 4 the wheels (17) by way of conventional couplings (not 5 shown) and also to the air bags (3, 7, 11) to maintain 6 the air pressure therein. When the source of 7 pressurised air is turned off the drop in pressure 8 causes the brakes to be applied, but the air bags 9 (3,7,11) generally remain inflated. 10 11 Particularly in the case of an extendible skeletal 12 trailer, in which the chassis comprises two portions 13 which are slideable relative to each other in a 14 longitudinal direction of the trailer, transverse 15 locking pins (not shown) are provided to lock the two 16 portions of the chassis in one of a number of 17 alternative positions in order to adapt the trailer for 18 a particular container configuration to be carried. 19 20 Previously, it has been conventional practice to 21 provide operating means, such as a push button, on the 22 side of the chassis for lifting and lowering forward 23 wheels. However, as discussed hereinbefore, 24 this does not comply with current legal requirements. 25 26 In the present invention as shown in Fig. 1, the 27 pressurised air system (2) supporting the axle air bags 28 (3,7,11) includes two 3/2 pilot valves (15) located 29 between the forward wheels (17a) and the rearward 30 wheels (17b,c). The pilot valves (15) are able to 31 selectively direct pressurised air to either the front 32 air bags (3) or the rear air bags (7,11).
2 The venting of the air bag (3) is controlled by an 3 independent pressurised air system in having a pull 4 switch (13) in which pressurised air (19) is only fed 5 to the pull switch (13) and solenoi-1, (16) when the 6 parking brakes of the trailer are applied. 7 8 To ef f ect venting of the air bags (.3'), the pressurised 9 air system provides pressurised air to 3/2 pilot valve (15) In the absence of air pressu- e, the air bags (3, 11 7, 11) are able to communicate with each other as 12 illustrated, but when air pressure is applied to the 13 pilot of the valve (15), the pilot -lides to isolate 14 the rear air bags (7, 11) of the rearward two pairs of wheels (17h, c) (which remain pressur--'-.sed), and to allow 16 the forward pair of air bags (3) to vent to atmosphere 17 and therefore to depressurise.
18 19 The front wheels (17a) should still be in contact with 20 the ground, but carry no weight. T'_ne locking pins are 21 disengaged to allow for the extension to retraction of 22 the trailer chassis.
23 24 With an electronic counter (18) conrected between a stop light power and the solenoid s%'_tch (16), a given 26 number of electronic pulses can signal the solenoid 27 valve (16) to allow pressurised air to the pull valve 28 (13) which prevents the pilot valve "15) from being 29 pressurised, closes the vent to atmosphere and re- connects the forward air bags (3) wit--h the rearward air 31 bags (7 and 11).
32 9 1 The electronic pulses may be based on a predetermined 2 number of uses of the brake pedal, e.g. 5, or on the 3 trailer achieving a predetermined speed, e.g. 5 or 10 4 kph. This allows the user of the trailer some movement 5 of the trailer without automatic repressurisation of 6 the forward airbags (3). The user may wish to conduct 7 some small movement of the trailer to assist alignment 8 with loading and/or unloading. It also allows the user 9 to achieve a limited speed in the yard, which is below 10 any intended public highway speed. However, on 11 attaining a public highway speed, eg above 5 or 10 kph, 12 the forward airbags (3) would be repressurised, re13 engaging the forward wheels (17a), and so avoiding 14 possible non-compliance with public highway transfer 15 legislation. 16 17 When the source of pressurised. air is reconnected 18 to the brake line, the brakes can then be released. 19 20 The invention is not limited to the embodiments herein 21 described which may be varied in construction and 22 detail. 23 24
Claims (17)
1 CLAIMS
2 3 1 A semi-trailer assembly having a trailer chassis 4 and two or more pairs of whee7.-.s, at least the one pair of wheels being supported by a pressurised 6 fluid system, wherein the pressure of the fluid iri 7 the pressurised fluid system is independently 8 controllable from the pressure of the fluid 9 supporting any other pairs of wheels.
11
2. A semi-trailer as claimed in Claim 1 having two, 12 three or four pairs of wheels.
13 14
3. A semi-trailer assembly as claimed in Claim 2 is having three pairs of wheels.
16 17
4. A semi-trailer assembly as claimed in any one of 18 Claims 1-3 wherein the pressiii-ised fluid means is 19 a pressurised air system.
21
5. A semi-trailer assembly as claimed in Claim 4 22 wherein each pair of wheels is supported on a 23 suspension system which includes a container for 24 pressurised air.
26
6. A semi-trailer assembly as claimed in any one of 27 the preceding Claims wherein all the pairs of 28 wheels are supported by a conrected pressurised 29 fluid system.
31
7. A semi-trailer assembly as claimed in Claim 6 32 wherein -the pressure of the f-!,,iid in the I pressurised fluid system for the forward pair of 2 wheels is independently controllable.
3 4
8. A semi-trailer assembly as claimed in any one of the preceding Claims wherein depressurisation of 6 the pressure of the fluid is achieved by venting 7 of the fluid to atmosphere.
8 9
9. A semi-trailer assembly as claimed in any one of the preceding Claims wherein control of the 11 pressure of the fluid is by one or more valve 12 means.
13 14
10. A semi-trailer assembly as claimed in Claim 9 wherein the valve means is one or more of the 16 group comprising: pilot valve, push/pull valve, 17 electrical solenoid valve or electrical impulse 18 valve.
19
11. A semi-trailer assembly as claimed in Claim 10 21 wherein the means valve is a 3/2 pilot valve.
22 23
12. A semi-trailer assembly as claimed in any one of 24 the preceding Claims being an extendable skeletal trailer.
26 27
13. A semi-trailer assembly as claimed in any one of 28 the preceding Claims wherein repressurisation of 29 the controllable pressurised fluid system is dependent on multiple use of the brakes of the 31 assembly.
32 1
14. A semi-trailer assembly as claimed in any one of 2 Claims 1-12 wherein repressurisation of the fluid 3 in the pressurised fluid systeir. is dependent on 4 speed of the semi-trailer assembly.
6
15. A trailer chassis with three axles and three pairs 7 of wheels arranged as a forward pair and one or 8 more rearward pairs for supporting the chassis and 9 any load thereon, each pair of wheels being supported on a connected suspension system which 11 includes a container for pressurised air, the 12 semi-trailer assembly including:
13 14 means for releasing the air solely from the air container for the forward pair of wheels such tha-_ 16 the forward pair of wheels remains in contact wit-1 17 a ground surface but carries no weight of the 18 trailer chassis and any load thereon; and means to 19 enable depressurisation of the suspension system of the forward pair of wheels:--. Ln response 21 application the brakes of the,Theels of the 22 trailer assembly.
23 24
16. A kit for application to a sem:-,---tra.iler assembly having a --railer chassis and tv,,o or more pairs of 26 wheels, the pairs of wheels be:'.-ng supported by a 27 pressurised fluid system, wher-'.in the kit 28 comprises means for allowing independent control 29 of the pressure of the fluid supporting at least one of the pairs of wheels.
31 13 1
17. A semi-trailer assembly substantially as herein 2 described with reference to Figure 1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB9928064.6A GB9928064D0 (en) | 1999-11-29 | 1999-11-29 | Semi-trailer assembly |
| GB0013308A GB0013308D0 (en) | 2000-06-02 | 2000-06-02 | Semi-trailer assembly |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB0028779D0 GB0028779D0 (en) | 2001-01-10 |
| GB2356608A true GB2356608A (en) | 2001-05-30 |
| GB2356608B GB2356608B (en) | 2002-08-14 |
Family
ID=26244402
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0024758A Expired - Fee Related GB2356607B (en) | 1999-11-29 | 2000-10-10 | Semi-trailer assembly |
| GB0028779A Expired - Fee Related GB2356608B (en) | 1999-11-29 | 2000-11-27 | Semi-trailer assembly |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0024758A Expired - Fee Related GB2356607B (en) | 1999-11-29 | 2000-10-10 | Semi-trailer assembly |
Country Status (2)
| Country | Link |
|---|---|
| GB (2) | GB2356607B (en) |
| IE (1) | IE20000970A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2387359A (en) * | 2002-03-27 | 2003-10-15 | Wheelbase Engineering Ltd | Control system for lift axles |
| EP2390121A1 (en) * | 2010-05-31 | 2011-11-30 | Schmitz Gotha Fahrzeugwerke GmbH | Commercial vehicle trailer and control device for pneumatic spring assembly |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB936001A (en) * | 1958-11-24 | 1963-09-04 | Magneti Marelli Spa | Improvements in or relating to automatic pressure fluid distributors for vehicle suspensions |
| GB2239222A (en) * | 1989-12-23 | 1991-06-26 | Rubery Owen Rockwell Ltd | Multi-axle air suspension for a vehicle |
| GB2254057A (en) * | 1990-09-27 | 1992-09-30 | Saab Scania Ab | Arrangement on a vehicle bogie to distribute weight between a driven and non-driven axle |
| GB2282111A (en) * | 1993-09-24 | 1995-03-29 | M & G Tankers & Trailers Ltd | Lift axles |
| GB2288771A (en) * | 1994-04-29 | 1995-11-01 | M & G Tankers & Trailers Ltd | Trailer with air suspension and a lift-axle |
| GB2337731A (en) * | 1998-05-27 | 1999-12-01 | Overlander Trailers Ltd | Trailer Assembly |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA923933A (en) * | 1971-04-30 | 1973-04-03 | L. Fearon Robert | Vehicle with longitudinally adjustable load bearing axle |
| US4230334A (en) * | 1979-01-22 | 1980-10-28 | Mabry Jr Vern D | Cantilevered medial trailer |
| US4635742A (en) * | 1985-01-18 | 1987-01-13 | Jd-Bertolini Industries, Ltd. | Extendable chassis |
| NL9302012A (en) * | 1993-11-19 | 1994-04-05 | Cornelis Gerardus Strien | Trailer for transporting ISO standard containers. |
-
2000
- 2000-10-10 GB GB0024758A patent/GB2356607B/en not_active Expired - Fee Related
- 2000-11-27 GB GB0028779A patent/GB2356608B/en not_active Expired - Fee Related
- 2000-11-28 IE IE20000970A patent/IE20000970A1/en not_active Application Discontinuation
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB936001A (en) * | 1958-11-24 | 1963-09-04 | Magneti Marelli Spa | Improvements in or relating to automatic pressure fluid distributors for vehicle suspensions |
| GB2239222A (en) * | 1989-12-23 | 1991-06-26 | Rubery Owen Rockwell Ltd | Multi-axle air suspension for a vehicle |
| GB2254057A (en) * | 1990-09-27 | 1992-09-30 | Saab Scania Ab | Arrangement on a vehicle bogie to distribute weight between a driven and non-driven axle |
| GB2282111A (en) * | 1993-09-24 | 1995-03-29 | M & G Tankers & Trailers Ltd | Lift axles |
| GB2288771A (en) * | 1994-04-29 | 1995-11-01 | M & G Tankers & Trailers Ltd | Trailer with air suspension and a lift-axle |
| GB2337731A (en) * | 1998-05-27 | 1999-12-01 | Overlander Trailers Ltd | Trailer Assembly |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2387359A (en) * | 2002-03-27 | 2003-10-15 | Wheelbase Engineering Ltd | Control system for lift axles |
| EP2390121A1 (en) * | 2010-05-31 | 2011-11-30 | Schmitz Gotha Fahrzeugwerke GmbH | Commercial vehicle trailer and control device for pneumatic spring assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0024758D0 (en) | 2000-11-22 |
| IE20000970A1 (en) | 2001-11-14 |
| GB2356607A (en) | 2001-05-30 |
| GB2356608B (en) | 2002-08-14 |
| GB2356607B (en) | 2002-01-23 |
| GB0028779D0 (en) | 2001-01-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20071127 |