DESC:FORM – 2

THE PATENTS ACT, 1970
(39 of 1970)

COMPLETE SPECIFICATION
(See section 10; rule 13)

“ANTI-TRAILER LIFT DETECTION SYSTEM FOR RTG CRANE"

Adani Ports and Special Economic Zone Limited
A Company Incorporated under the Indian Companies Act
Adani House, Near Mithakhali Circle,
Navrangpura, Ahmedabad, Gujarat, India, 380009

The following specification particularly describes the nature of this invention and the manner in which it is to be performed:
FIELD OF THE INVENTION:
The present invention relates to an Anti-Trailer Lift Detection System for RTG Crane. More particularly, the present invention relates to an Anti-Trailer Lift Detection System for RTG Crane that ensures trailer Chassis is not lifted upward while the Rubber Tyre Gantry Crane (here referred as RTG Crane) lifts the container from trailer chassis or platform using Spreader.

BACKGROUND OF THE INVENTION AND PRIOR ART:

A rubber tyre gantry crane (RTG crane) (also transtainer) is a mobile gantry crane used in intermodal operations to ground or stack containers. Inbound containers are stored for future pickup by drayage trucks, and outbound are stored for future loading on to vessels. RTGs typically straddle multiple lanes, with one lane reserved for container transfers.
Being mobile, RTGs are often powered by Diesel generator systems (gensets) of 100 to 600kW. The first electrified rubber-tyred gantry cranes (ERTG) in the China was unveiled in Aug 2008 by The She Kou container terminal (SCT). The new technology reduces fuel consumption by an estimated 95 percent.
Typical RTGs comprises of:
• the vertical girders
• two horizontal girders mounted on said vertical girders,
• spreader
• hoist
• trolley

said vertical girders are in pair on each side, travelling on the track using tyres below vertical girders;

said spreader attached to the hoist mounted on the trolley and is used to unload containers from truck in stack and load containers on truck for the movement outside the terminal,

said structure achieves the task by travelling on the horizontal girder over the containers stack.

In a container terminal, containers are stacked in the yard, before being sent to the ship or outside container terminal. This stacking of the containers in the container yards is done by said Rubber Tyre Gantry (RTG) crane that travels on wheels over the container stack (CS), as shown in (Fig. 2). The mobilization of the said container is done by the Truck (TR) that have trailer (TT) attached to it. Said trailer (TT) is the platform at which container is loaded, wherein said platform has twist locks (TL) installed on the corners that when twisted, fits into the twist lock brackets of the container. (Fig.3 and Fig. 5) shows the Truck (TR) with trailer (TT) having twist locks (TL).
A container terminal has two parts i.e. Quay and Yard. Quay is the area where vessel berth and Quay cranes are mounted. Quay Cranes receive the containers loaded (L) on the truck (TR) below them for loading on to the vessel or empty trucks (TR) for the container to be unloading (UL) from the vessel for inland movement.
The second part is the yard, which serve the purpose of the intermediary storage area for the containers unloaded (UL) form the vessel and waiting for the pick-up trucks (TR) for inland movement or for the containers waiting for the vessel for outward deliveries. As the number of containers coming in and out of the container terminal is very large it is imperative to have a strong system that records each container position in the yard. For the purpose of assigning position address to each container, every yard is sub divided into Block (BL), Bay (BA), Row (RO) and Tier (TI). (Fig. 4)
The yard (Y) bound trailers (TT) that arrives below RTG crane, have container loaded on them as shown in (Fig.2). Said containers, in order to avoid toppling during the transit, are locked above the trailer (TT) using the twist locks (TL). Ideally a trailer (TT) has eight twist locks to accommodate two twenty foot containers, which when twisted gets fixed into the twist lock brackets of the container. Each said container has twist lock brackets on its upper and lower corner, which ensures that the container loaded on the trailer (TT) does not get toppled accidentally during the movement or because of sudden application of break by the truck driver. Said twist locks (TL) are required to be unlocked before the RTG crane lifts container upward using spreader (S), wherein Spreader (S) is a metal frame attached to the hoist motor (HM) with help of wire ropes. The spreader (S) has twist locks (TL) which when twisted, fits into the upper twist lock brackets of the container.
A Rubber Tyre Gantry (RTG) crane operator operates from operator cabin (HE) of Rubber Tyre Gantry (RTG) Crane, at a height of 18.1 meter from ground. The crane operator have a Vehicle Mounted Terminal (VMT) in his cabin (HE), at which operator receives regular information of the jobs i.e. Loading (L) or Unloading (UL), to be performed. The operator receives the said information from the Terminal Operating System (TOS) for executing loading or unloading job.
A job could either to load (L) the container from the container stack (CS) on the Truck (TR) or to unload (UL) a container into the container stack (CS) from the Truck (TR).
Primarily there are two sources from which a container terminal receives the containers. The first source is the vessel and the second source is the inland factories/Container depots.
For the containers that are unloaded (UL) from the vessel, the checker (an individual deployed on the quay) records the container number on the Vehicle Mounted Terminal (VMT) and the planner assigns an unloading position to the truck (TR) driver.
Similarly when a container is received from the inland factory or container depot at the gate of the container terminal the gate checker checks the mandatory documents and on his satisfaction, feeds the container number in the Terminal Operating System (TOS). Based on the inputs entered by the gate checker the position is generated by the Terminal Operating System (TOS) and same is assigned to the truck (TR) driver.
The second task performed by a container terminal is the dispatch of the container. During dispatch, the containers are to be dispatched to two locations. First is to the vessel and second is to the inland factories/container depots.
For the containers to be delivered to the vessel, planner, on arrival of a vessel on the quay, through Terminal Operating System (TOS) assigns the loading (L) job to the Rubber Tyre Gantry (RTG) Crane. A job contains container number and its position.
Similarly, in case of dispatch to the inland factories/container depot, the loading (L) job is assigned to the Rubber Tyre Gantry (RTG) Crane as soon as the truck (TR) enters the container terminal gate. The gate checker checks the documents and on his satisfaction, assigns the position to the truck (TR). Once the position is assigned to the truck the loading (L) job is assigned to Rubber Tyre Gantry (RTG) Crane.
While performing loading (L) and unloading (UL) of the container, it is responsibility of the Rubber Tyre Gantry (RTG) crane operator to update the position of the container in the Vehicle Mounted Terminal (VMT). For the purpose of assigning position address to each container, every container terminal is divided into Yard, Block (BL), Bay (BA), Row (RO) and Tier (TI). (Fig. 4) The yards are marked with Yard Numbers, Block Number and Bay Numbers.
While unloading the containers from the truck, the yard bond containers that arrive below RTG crane are locked using twist locks on the chassis of trailer. However, there is possibility, where twist lock (TL) of the trailer (TT) is not unlocked and the spreader lifts the chassis of the trailer while lifting the container because of low visibility to the RTG Crane operator. This leads to fatal accidents. Thus, there is a need to develop a system that ensures trailer Chassis is not lifted upward while the Rubber Tyre Gantry Crane (here referred as RTG Crane) lifts the container from trailer chassis or platform using Spreader.

PRIOR ART AND ITS DISADVANTAGES
The prior art US 12/748,343 “Method and apparatus for crane topple/collision prevention” proposes use of Proximity sensor, Communicative coupling and PLC to avoid a condition were Spreader (S) fails to disengage, causing possibility of truck getting lifted up with container, though the output generated is limited to the generation of alert message only.
However, even after generation of the alert message, there is possibility of negligence, in which container is lifted upward. Thus the prior art does not mitigate the complete risk of failure of spreader’s disengagement with the container.
Available systems for detection of lifting of trailer chassis along with the container involves manual or sensor based detection. They suffer from at least one of the following disadvantages:
1. Manual methods for detection involves observation by crane operator which fails to detect the same accurately due to the position at which the crane operator is sitting. Not every angle of the crane and the lifted portions are visible to him.
2. Manual observation by another person (not the crane operator) also cannot be accurate and real time notification to the crane operator may not be possible.
3. Even if the crane operator is notified in real time; it is difficult for the crane operator to manage crane operation along with the communications with such another person.
4. Once the chassis is already started to be lifted; communication by such other person and then stopping the crane by the crane operator lifting the container does not serve the purpose.
5. Even if the notification is automated and detection is sensor based; management by the crane operator suffers from one of the aforementioned problems.

Thus, there is an unmet need to develop a system that ensures trailer Chassis is not lifted upward while the Rubber Tyre Gantry Crane (here referred as RTG Crane) lifts the container from trailer chassis or platform using Spreader.

OBJECTS OF THE PRESENT INVENTION
The main object of the present invention is to provide an Anti-Trailer Lift Detection System for RTG Crane that ensures trailer Chassis is not lifted upward while the Rubber Tyre Gantry Crane lifts the container from trailer chassis or platform using Spreader.
Another object of the present invention is to provide an Anti-Trailer Lift Detection System for RTG Crane that detects the trailer carrying container chassis movement and stops the upward movement of the spreader automatically if the trailer is found to be moving upward with the container.
Yet another object of the present invention is to provide an Anti-Trailer Lift Detection System for RTG Crane that eliminates the risk of fatal accidents that could lead to the loss man, material or machinery.
Yet another object of the present invention is to provide an Anti-Trailer Lift Detection System for RTG Crane that is reliable and efficient.
Yet another object of the present invention is to provide an Anti-Trailer Lift Detection System for RTG Crane that obviates the problems of the prior art.

BRIEF DESCRIPYION OF DRAWINGS:
FIGURE DESRIPTION
Fig. 1 : Shows Block diagram of present Anti- trailer Lift Detection System.
Fig. 2 : Shows Rubber Tyre Gantry Crane (RTG) of the present Anti- trailer Lift Detection System.
Fig. 3
: Shows Truck with trailer having Twist Lock of the present Anti-trailer Lift Detection System.
Fig. 4 : Shows Block, Bay, Row and Tier of the present Anti-trailer lift detection System.
Fig. 5 : Shows Twist Lock Bracket of container the present Anti –trailer lift detection system
Fig. 6 : Shows laser sensors installed on boggy structure of RTG crane of the present Anti-trailer Lift Detection System.
Fig. 7
: Shows enlarged view of Fig.6 of the present Anti-trailer Lift Detection System.
Fig. 8 : Shows trailer lifted upwards with the container in the present Anti-trailer Lift Detection System.
Fig. 9 : Shows container lifted upward from the trailer in the present Anti trailer Lift Detection System.
Fig. 10 : Shows the flow chart for unloading cycle of the present Anti trailer Lift Detection System.

Meaning of Reference numerals of said format of said component parts of present automatic container position detection system:
(A) : Anti-trailer Lift Detection System
(RTG) : Rubber Tyre Gantry
(S) : Spreader
(TR) : Truck
(LS) : Laser Sensor
(T) : Trolley
(H) : Hoist and Hoist Encoder
(L) : Load
(UL) : Unload
(HD) : Hoist Drive
(HM) : Hoist motor
(C) : Controller
(VMT) : Vehicle Mounted Terminal
(TOS) : Terminal Operating System
(TI) : Tier
(BL) : Block
(RO) : Row
(BA) : Bay
(CS) : Container Stack
(TT) : Trailer
(TL) : Twist Lock
(Y) : Yard
(HE) : Cabin
(SP) : Spreader
(COH) : Hoist Encoder Processing
(COD) : Means of Detection
(COHC) : Means of Comparison
(P) : Means of processing
(HG) : Horizontal Girder
(VG) : Vertical Girder
(TE) : Trolley Encoder

SUMMARY OF INVENTION:

The present invention embodies an Anti-Trailer Lift Detection System (A) for RTG Crane that ensures trailer Chassis is not lifted upward while the Rubber Tyre Gantry Crane (here referred as RTG Crane) lifts the container from trailer chassis or platform using Spreader. Present Anti-Trailer Lift Detection System (A) is installed in the existing infrastructure of the container terminal.
Present an Anti- Trailer lift detection system (A), mainly comprises of a Rubber Tyre Gantry (RTG) crane further comprising:
• Laser sensors (LS),
• Trolley Encoder (TE),
• Hoist Encoder (H),
• Controller (C),
• Vehicle Mounted Terminal (VMT),
• Terminal Operating System (TOS);

wherein:
- said controller (C) further comprises of:
o Hoist Encoder Processing (COH) which is in turn comprised of:
? means for detection (COD),
? means for comparison (COHC);
? means for processing (P) laser sensors (LS)
- said Vehicle Mounted Terminal (VMT) is further comprised of:
? Means for display (VD), and
? Means for transmitting (VT);
said Terminal Operating System (TOS) further comprises of:
? Means for updating (TU),
? Means for displaying (TD).
DETAILED DESCRIPTION OF INVENTION:

The present invention embodies an Anti-Trailer Lift Detection System (A) for RTG Crane that ensures trailer Chassis is not lifted upward while the RTG Crane lifts the container from trailer chassis or platform using Spreader. Present Anti-Trailer Lift Detection System (A) is installed in the existing infrastructure of the container terminal.
Referring to Fig.2 shows, the RTG crane used in the present Anti-trailer Lift detection System (A) uses existing RTG with:

• the vertical girders (VG)
• two horizontal girders (HG) mounted on said vertical girders,
• spreader (S)
• hoist and Hoist Encoder (H)
• trolley (T)
• Bus Bar (BB),
• Drive-In Trolley (DT),
• Terminal Operating System (TOS)
and requires installation of following for installing present Anti-Trailer lift detection system:
• Laser sensors 1 (LS1),
• Laser sensors 2 (LS 2),
• Laser sensors 3 (LS 3),
• Laser sensors 4 (LS 4), as shown in Fig. 6 and Fig. 7
• Hoist Drive (HD)
• Hoist Motor (HM)

Wherein;

Said container yard consists of multiple RTG Cranes. Said RTG cranes are provided to load (L) and unload (UL) the containers from the container stack (CS) below to the trailer (TT) and from the trailers (TT) to the container stack (CS). The said RTG crane unloads (UL) the container from the trailer (TT) in the container stack (CS), through the spreader (S). Said spreader (S) is moved downwards on the top of the trailer (TT) carrying container with help of wire ropes and a hoist motor (HM). Said spreader (S) of the RTG crane consists of twist locks (TL), wherein said twist locks when twisted, locks over the container with the spreader (S) to facilitate the unloading (UL). Also further the trailer (TT) carrying container consist of twist locks (TL) which locks the container on the trailer’s (TT) platform upon twisting the said twist lock (TL) as shown in Fig.3 Said locking of the container on trailer’s platform ensures that the containers do not move from trailer while trailer (TT) is driven.
Fig.2 shows the rubber tyre Gantry crane used in the present Anti-Trailer Lift detection System (A). The Rubber Tyre Gantry (RTG) is remotely operated in the present invention wherein the Rubber Tyre Gantry (RTG) crane operator sits in the remote operations station where he have access of Rubber Tyre Gantry (RTG) through wi-fi network and job information through Vehicle Mounted Terminal (VMT).
Referring to Fig. 1 to 10 present an Anti-trailer lift detection system (A) mainly comprises of a Rubber Tyre Gantry (RTG) crane further comprising:

• Plurality of Laser sensors (LS)
• Hoist Encoder (H)
• Controller (C)
• Vehicle Mounted Terminal (VMT)
• Terminal Operating System (TOS)
• Spreader (S)
• Hoist Drive (HD)
• Hoist Motor (HM)
wherein:
Referring to Fig.2 rubber tyre gantry cane (RTG) is provided for loading (L) and unloading (UL) of the containers held in the trailer (TT). An unloading (UL) job is assigned to said RTG Crane once the trailer (TT) carrying container arrives at the terminal gate. At terminal gate, the gate operator checks documents and upon his satisfaction to the standards, the gate operator allows the movement of the trailer to the pre-defined location at the container yard (Y) where said RTG crane is moved on the designated bay, where the trailer carrying container is unloaded and takes the spreader (S) over the container for unloading (UL) the container in the yard (Y). Said spreader (S) is attached to the container through twist lock (TL). Operator of the RTG crane gets the signal on locking and unlocking of the said twist lock (TL) of trailer (TT). Said RTG cranes load (L) and unload (UL) the containers either from the container stack (CS) below the trailer (TT) and/or from the trailers (TT) to the container stack (CS). Said container is unloaded (UL) from the trailer (TT) in the container stack (CS) using the spreader (S). Said spreader (S) is moved downwards on the top of the trailer (TT) carrying container with help of wire ropes and a hoist motor (HM). Said spreader (S) of the RTG crane consist of twist locks (TL) as show in in Fig 2 and Fig 3. Said trailer (TT) carrying container consists of twist locks (TL) that, locks the container on the trailer’s (TT) platform as shown in Fig.3, wherein locking of the said container on trailer’s platform ensures the containers do not move from trailer while trailer (TT) is driven. Said twist locks upon twisting, locks over the container with said spreader (S) further facilitates in the unloading (UL) of the container.

A Vehicle Mounted Terminal (VMT) is a mobile electronic device having a means of Display (VD), a keypad and a means of transmitting (VT) of data transmission. The user or Rubber Tyre Gantry (RTG) Crane operator receives the visuals on the display of the container number and its position on which either a loading (L) or unloading (UL) job is to be performed. On completing the said job the Rubber Tyre Gantry (RTG) Crane operator punch in the completion status and container position using keypad. This displays the job on the screen and the inputs from the Rubber Tyre Gantry (RTG) Crane operator is communicated to and fro with the Terminal Operating System (TOS). Where in case a Rubber Tyre Gantry (RTG) is remotely operated the Rubber Tyre Gantry (RTG) crane operator sits in the remote operations station where he has access of Rubber Tyre Gantry (RTG) through Wi-Fi network and job information through Vehicle Mounted Terminal (VMT).Said job is either to load (L) the container from the container stack (CS) on the Truck (TR) or to unload (UL) a container into the container stack (CS) from the Truck (TR).

A Terminal Operating System (TOS) is a system used at the container terminals to record and interpret the container terminal information. It records the database of the container coming in and out of the container terminal, containers stored in the yard with their respective position, vehicles coming In and out of the container terminal, vessel schedules, containers to be loaded (L) or unloaded (UL) from a vessel, and job allocated to the Rubber Tyre Gantry (RTG) Cranes. The Terminal Operating System (TOS) acts as an interface for the planner of the container terminal. Said Terminal Operating System (TOS) further comprises of: Means for displaying (TD) for displaying said records and other container terminal information; and Means for updating (TU) for updating the container terminal information and the records of the database including the details of the container coming in and out of the container terminal, containers stored in the yard with their respective position, vehicles coming In and out of the container terminal, vessel schedules, containers to be loaded (L) or unloaded (UL) from a vessel, and job allocated the Rubber Tyre Gantry (RTG) Cranes;
An encoder is an electro-mechanical device that converts the angular position or motion of a shaft or axle to an analog or digital code and transfers same to the controller (C). Said Hoist Encoder (H) is installed with Hoist Motor (HM) of RTG crane as shown in Fig.2 which further moves over the container stack (CS) on the Horizontal girder and controls the movement of the spreader (S).
Laser sensor (LS) is used to ensure that the said trailer (TT) is not lifted upwards along with the container. Four Laser Sensors (LS1, LS2, LS3, and LS4) are installed on boggy structure of the RTG crane, at a height of 1.8 meters from the ground as shown in Fig. 6 and Fig.7. Said plurality of laser sensors (LS) are installed parallel to the trailer (TT) at height of 1.8 meters from ground, considering the height of trailer (TT) from ground; which is 1.8 meter as shown in Fig.6. Said laser sensors (LS) sense the object (trailer platform) and gives binary input to the controller (C). Controller (C) is programmed to take input of any two out of the said four laser sensors (LS) according to the size of the container being unloaded (UL); wherein said one set of two laser sensors (LS) are designated for twenty feet container and another set of two laser sensors (LS) is designated for the forty feet container further were in lifting the container at the height of 100mm the input from any of the two laser sensors (LS) is sensed 1, means that the trailer is detected and the trailer is also getting lifted upwards along with the container as shown in Fig 8. Wherein, the input from both the laser sensors (LS) is 0, means that no trailer is detected and only the container is lifted upwards as shown in Fig. 9.

Said controller (C) controls the Unloading (UL) and is provided to process the inputs of the hoist encoder (H) to calculate the height of lifting the container above the trailer (TT); and evaluate inputs from the laser sensors (LS). Said spreader (S) lifts the container to a height of 100 mm above the trailer (TT) and further the controller (C) is programmed to take input of laser sensors (LS). Said inputs are in the form of binary inputs i.e. in the form of “0” and “1”. Further where in case the container is lifted upwards along with the trailer said controller (C) upon receiving the inputs from the Laser sensors (LS); gives stop command to the Hoist Drive (HD) which further stops the rotation of the Hoist motor (HM) and thereby stops the upward movement of the container, which aids to prevent an accident caused in case the trailer is also lifted upwards. A yard staff goes and checks for the physical condition, where trailer (TT) is found to be getting lifted upward, yard staff directs RTG crane operator to bring the container downwards to unlock the locked twist locks (TL) of the trailer (TT). In case where the trailer is not sensed the said controller does not provide the stop command and unloading (UL) of the container is permitted.

Fig.1 shows the block diagram of the present Anti-trailer lift detection system (A), wherein the said controller (C) is provided to process the inputs of the hoist encoder (H) to calculate the height of lifting the container above the trailer (TT) and inputs from the laser sensors. Said inputs are in the form of binary inputs i.e. in the form of “0” and “1”.The Controller (C) detects the spreader position (SP) using inputs from the said Hoist encoder (H) by the means of comparison (COHC) and means of detection (COD). Input of the said Hoist encoder (H) is processed (COH) and spreader position is determined and container is lifted upward. The present Anti-trailer lift detection system comprises of plurality of Laser sensors termed as Laser sensors 1 (LS1), Laser sensors 2 (LS 2), Laser sensors 3 (LS 3), Laser sensors 4 (LS 4), controlled by the said controller (C) Said laser sensors (LS) are positioned parallel to the trailer platform. Said two laser sensors (LS) are provided for twenty feet container and another set of two laser sensors (LS) are provided for the forty feet container. Said Laser sensors are attached on the boggy structure of the RTG crane to ensure that the trailer (TT) is not lifted upward along with the said container. Where the Controller receives the input “1” means that the trailer is sensed along with the container and the said Hoist Drive (HD) further stops the movement of the Hoist Motor (HM) thereby stops the movement of the spreader (S). Said Hoist Motor (HM) is stopped by the Host drive (HD) when the trailer (TT) is lifted along with the container, and thus stops the upward movement of the container as shown in Fig. 8. Unloading (UL) of container is permitted by the controller where the controller receives the input “0” trailer (TT) is not sensed and the RTG lifts the said container as shown in Fig.9.

WORKING OF THE INVENTION:
An unloading (UL) and loading (L) cycle for the detailed explanation on the stepwise working of the invention is provided below, referring to the numerals given in the flow chart illustrated in Fig.10:
• 1 and 2- The unloading (UL) process starts with the Truck (TR) carrying container, which arrives at the Pre Gate of the Port.
• 3, 4 and 5 - Upon its arrival a gate entry operator checks the shipping documents and allows the movement of the truck inside the terminal; if the shipping documents meet standards else truck (TR) is directed towards buffer yard to unload (UL) the container.
• 6, 7 and 8- On arrival of the truck (TR), carrying container, at the terminal gate position is generated by the gate operator. Said position is given to the truck driver and simultaneously displayed on the Vehicle Mounted Terminal (VMT) of the RTG crane.
• 9 and 10- RTG Crane moves to the yard using Job Information and lifts the container using its spreader (S).
• 11- Controller (C) processes Hoist encoder (H) and stops movement at a height of 100 mm from last lock position to detect the inputs of the laser sensors (LS).
• 12 and13- Controller (C), checks for the input of the laser sensor (LS). If the input is sensed “1”, controller (C) considers this as Object (Trailer Platform) has been detected by the said laser sensor (LS) and the trailer is also getting lifted upward with the spreader (S) thus upward movement of container is stopped by giving command to the Hoist Drive (HD).
• 14- Container is brought downward and twist locks (TL) are unlocked.
• 15- Controller (C) receives “0” as input from the laser sensor (LS) which is considered as Object (Trailer Platform) is not detected and the upward movement of the container is allowed.
• 16- Unloading (UL) job is finished.
,CLAIMS:We Claim:
1. Anti-trailer Lift Detection System(A) which mainly comprises of a Rubber Tyre Gantry (RTG), further comprising of:
o the vertical girders (VG)
o two horizontal girders (HG) mounted on said vertical girders,
o spreader (S),
o hoist and Hoist Encoder (H),
o trolley (T),
o Terminal Operating System (TOS),
o Laser sensors 1 (LS1),
o Laser sensors 2 (LS 2),
o Laser sensors 3 (LS 3),
o Laser sensors 4 (LS 4),
o Hoist Drive (HD),
o Hoist Motor (HM);

wherein;
said container yard consists of multiple RTG Cranes; said RTG cranes are provided to load (L) and unload (UL) the containers from the container stack (CS) below to the trailer (TT) and from the trailers (TT) to the container stack (CS) wherein said RTG crane unloads (UL) the container from the trailer (TT) in the container stack (CS), through the spreader (S); said spreader (S) is moved downwards on the top of the trailer (TT) carrying container with help of wire ropes and a hoist motor (HM); said spreader (S) of the RTG crane consists of twist locks (TL), wherein said twist locks when twisted, locks over the container with the spreader (S) to facilitate the unloading (UL), further the trailer (TT) carrying container consist of twist locks (TL) which locks the container on the trailer’s (TT) platform upon twisting the said twist lock (TL), said locking of the container on trailer’s platform ensures that the containers do not move from trailer while trailer (TT) is driven;
said rubber tyre gantry cane (RTG) is provided for loading (L) and unloading (UL) of the containers held in the trailer (TT) wherein an unloading (UL) job is assigned to said RTG Crane once the trailer (TT) carrying container arrives at the terminal gate, wherein at terminal gate, the gate operator checks documents and upon his satisfaction to the standards, the gate operator allows the movement of the trailer to the pre-defined location at the container yard (Y) where said RTG crane is moved on the designated bay, where the trailer carrying container is unloaded and takes the spreader (S) over the container for unloading (UL) the container in the yard (Y); said spreader (S) is attached to the container through twist lock (TL); further operator of the RTG crane gets the signal on locking and unlocking of the said twist lock (TL) of trailer (TT) and said RTG cranes load (L) and unload (UL) the containers either from the container stack (CS) below the trailer (TT) and/or from the trailers (TT) to the container stack (CS); said container is unloaded (UL) from the trailer (TT) in the container stack (CS) using the spreader (S) which moves the spreader (S) downwards on the top of the trailer (TT) carrying container with help of wire ropes and a hoist (HM) motor; said trailer (TT) carrying container consists of twist locks (TL) that, locks the container on the trailer’s (TT) platform wherein locking of the said container on trailer’s platform ensures the containers do not move from trailer while trailer (TT) is driven; said twist locks upon twisting, locks over the container with said spreader (S) further facilitates in the unloading (UL) of the container; RTG Crane operator is provided for loading (L) - unloading (UL) on Vehicle Mounted Terminal (VMT);
said Vehicle Mounted Terminal (VMT) is a mobile electronic device having a means of Display (VD), a keypad and a means of transmitting (VT) of data transmission; Rubber Tyre Gantry (RTG) Crane operator receives the visuals on the display of the container number and its position on which either a loading (L) or unloading (UL) job is to be performed; on completing the said job the Rubber Tyre Gantry (RTG) Crane operator punch in the completion status and container position using keypad; this displays the job on the screen and the inputs from the Rubber Tyre Gantry (RTG) Crane operator is communicated to and fro with the Terminal Operating System (TOS); further in case a Rubber Tyre Gantry (RTG) is remotely operated the Rubber Tyre Gantry (RTG) crane operator sits in the remote operations station where he has access of Rubber Tyre Gantry (RTG) through Wi-Fi network and job information through Vehicle Mounted Terminal (VMT), wherein said job is either to load (L) the container from the container stack (CS) on the Truck (TR) or to unload (UL) a container into the container stack (CS) from the Truck (TR);
said Terminal Operating System (TOS) is a system used at the container terminals to record and interpret the container terminal information; and records the database of the container coming in and out of the container terminal, containers stored in the yard with their respective position, vehicles coming In and out of the container terminal, vessel schedules, containers to be loaded (L) or unloaded (UL) from a vessel, and job allocated to the Rubber Tyre Gantry (RTG) Cranes; said Terminal Operating System (TOS) acts as an interface for the planner of the container terminal; said Terminal Operating System (TOS) further comprises of: Means for displaying (TD) for displaying said records and other container terminal information; and Means for updating (TU) for updating the container terminal information and the records of the database including the details of the container coming in and out of the container terminal, containers stored in the yard with their respective position, vehicles coming In and out of the container terminal, vessel schedules, containers to be loaded (L) or unloaded (UL) from a vessel, and job allocated the Rubber Tyre Gantry (RTG) Cranes;
said encoder is an electro-mechanical device that converts the angular position or motion of a shaft or axle to an analog or digital code and transfers same to the controller (C) wherein said Hoist Encoder (H) is installed with Hoist (H) of RTG crane ;
said Laser sensor (LS) is used to ensure that the said trailer (TT) is not lifted upwards along with the container; Four Laser Sensors (LS1, LS2, LS3, and LS4) are installed on boggy structure of the RTG crane, at a height of 1.8 meters from the ground wherein said plurality of laser sensors (LS) are installed parallel to the trailer (TT) at height of 1.8 meters from ground, considering the height of trailer (TT) from ground; which is 1.8 meter ;said laser sensors (LS) sense the object (trailer platform) and gives binary input to the controller (C); Controller (C) is programmed to take input of any two out of the said four laser sensors (LS) according to the size of the container being unloaded (UL); wherein said one set of two laser sensors (LS) are designated for twenty feet container and another set of two laser sensors (LS) is designated for the forty feet container further were in lifting the container at the height of 100mm the input from any of the two laser sensors (LS) is sensed 1, means that the trailer is detected and the trailer is also getting lifted upwards along with the container ; wherein, the input from both the laser sensors (LS) is 0, means that no trailer is detected and only the container is lifted upwards as ;
said controller (C) controls the Unloading (UL) and is provided to process the inputs of the hoist encoder (H) to calculate the height of lifting the container above the trailer (TT); and evaluate inputs from the laser sensors (LS)wherein the spreader (S) lifts the container to a height of 100 mm above the trailer (TT) and further the controller (C) is programmed to take input of laser sensors (LS)wherein the inputs are in the form of binary inputs i.e. in the form of “0” and “1”, further where in case the container is lifted upwards along with the trailer said controller (C) upon receiving the inputs from the Laser sensors (LS); gives stop command to the Hoist Drive (HD) which further stops the rotation of the Hoist motor (HM) and thereby stops the upward movement of the container, which aids to prevent an accident caused in case the trailer is also lifted upwards; in case where the trailer is not sensed the said controller does not provide the stop command and unlading (UL) of the container is permitted;
said Controller (C) further detects the spreader position (SP) using inputs from the said Hoist encoder (H) by the means of comparison (COHC) and means of detection (COD); input of the said Hoist encoder (H) is processed (COH) and spreader position is determined and container is lifted upward; wherein present Anti-trailer lift detection system comprises of plurality of Laser sensors termed as Laser sensors 1 (LS1), Laser sensors 2 (LS 2), Laser sensors 3 (LS 3), Laser sensors 4 (LS 4), controlled by the said controller (C); said laser sensors (LS) are positioned parallel to the trailer platform, where two laser sensors (LS) are provided for twenty feet container and another set of two laser sensors (LS) are provided for the forty feet container; said Laser sensors are attached on the boggy structure of the RTG crane to ensure that the trailer (TT) is not lifted upward along with the said container; where the Controller receives the input “1” means that the trailer is sensed along with the container and the said Hoist Drive (HD) further stops the movement of the Hoist Motor (HM) thereby stops the movement of the spreader (S) ; Hoist Motor (HM) is stopped by the Host drive (HD) when the trailer (TT) is lifted along with the container, and thus stops the upward movement of the container ;Unloading (UL) of container is permitted by the controller where the controller receives the input “0” trailer (TT) is not sensed and the RTG lifts the said container;
said Anti-trailer lift detection system (A) works either from the RTG crane operator cabin or remotely from a remote operations station working on Wi-Fi technology wherein the crane operator have access of Rubber Tyre Gantry (RTG) through Wi-Fi network and job information through Vehicle Mounted Terminal (VMT).

2. Present Anti-trailer lift detection system (A) as claimed in claim 1, wherein said system comprises of plurality of Laser sensors (LS); LS1, LS2, LS3, LS4 which are provided to ensure that the said trailer (TT) is not lifted upwards along with the container; said plurality of sensors are installed on boggy structure of the RTG crane, at a height of 1.8 meters from the ground wherein said plurality of laser sensors (LS) are installed parallel to the trailer (TT) at height of 1.8 meters from ground, considering the height of trailer (TT) from ground; which is 1.8 meter ;said laser sensors (LS) sense the object (trailer platform) and gives binary input to the controller (C): said binary input is “0” – “1”.
Dated this 3rd day of April, 2017
__________________________
GOPI J. TRIVEDI (Ms.)
(Authorized Patent Agent of the Applicant)

To,
The Controller of Patents,
The Patent Office,
Mumbai.