Abrégé

A leveling control system and method for heavy equipment, in which a lower frame having a traveling unit and an upper frame are combined together by a tilting unit, includes a sensor unit, provided in the equipment, for measuring twist angles of the lower frame and the upper frame against a reference horizontal surface and a traveling speed of the equipment, and detecting working state information of working devices; a control unit for receiving the twist angles, the traveling speed, and the working state information, calculating a correction angle for the leveling control of the upper frame, and generating a control signal for instructing an operation of an actuator in accordance with the correction angle; and a driving unit for performing the leveling through the actuator in accordance with the control signal received therein.

Classes IPC  ?

• G06F 7/70 - Méthodes ou dispositions pour effectuer des calculs en utilisant une représentation numérique non codée, c.-à-d. une représentation de nombres sans baseDispositifs de calcul utilisant une combinaison de représentations de nombres codées et non codées utilisant des trains d'impulsions stochastiques, c.-à-d. des impulsions apparaissant au hasard et dont la moyenne des taux d'impulsion représente des nombres
• G06F 19/00 - Équipement ou méthodes de traitement de données ou de calcul numérique, spécialement adaptés à des applications spécifiques (spécialement adaptés à des fonctions spécifiques G06F 17/00;systèmes ou méthodes de traitement de données spécialement adaptés à des fins administratives, commerciales, financières, de gestion, de surveillance ou de prévision G06Q;informatique médicale G16H)
• G06G 7/00 - Dispositifs dans lesquels l'opération de calcul est effectuée en faisant varier des grandeurs électriques ou magnétiques
• G06G 7/76 - Calculateurs analogiques pour des procédés, des systèmes ou des dispositifs spécifiques, p. ex. simulateurs de circulation, p. ex. circulation routière
• G01D 5/00 - Moyens mécaniques pour le transfert de la grandeur de sortie d'un organe sensibleMoyens pour convertir la grandeur de sortie d'un organe sensible en une autre variable, lorsque la forme ou la nature de l'organe sensible n'imposent pas un moyen de conversion déterminéTransducteurs non spécialement adaptés à une variable particulière

Abrégé

A traveling and turning device for a construction machine is provided, which includes a left driving motor and a right driving motor driven by hydraulic fluid, a left main control valve and a right main control valve controlling movement of the left driving motor and the right driving motor, respectively, and a left pedal and a right pedal adjusting the operation state of the left main control valve and the right main control valve, respectively. One of the left pedal and the right pedal enables the construction machine to make forward and backward movement by simultaneously applying pressure to a left side of a spool of the left main control valve and a left side of a spool of the right main control valve or by simultaneously applying pressure to a right side of the spool of the left main control valve and a right side of the spool of the right main control valve, and the other of the left pedal and the right pedal enables the construction machine to make turning movement by simultaneously applying pressure to the left side of the spool of the left main control valve and the right side of the spool of the right main control valve or by simultaneously applying pressure to the right side of the spool of the left main control valve and the left side of the spool of the right main control valve.

Classes IPC  ?

• B62D 11/04 - Direction pour roues non orientablesDirection pour véhicules à chenilles ou à dispositifs similaires par entraînement différencié des éléments en contact avec le sol sur les côtés opposés du véhicule par sources d'énergie séparées

Abrégé

A hydraulic cylinder cushion device installed in a hydraulic cylinder provided, in which a rod performs reciprocating movement in a cylinder tube, and which discharges high-pressure hydraulic fluid that is formed in pressure chambers between a piston and a head cover and between the piston and a cover end during a stroke-end operation. The hydraulic cylinder cushion device includes a check ring which is installed in a groove provided on an inner surface of the head cover or the cover end, and moves to one side in the groove so as to close a flow path during rushing into a stroke end while it moves to the other side in the groove so as to open the flow path during an initial operation in the stroke end.

Classes IPC  ?

• F15B 15/22 - Autres parties constitutives pour accélérer ou ralentir le mouvement

Abrégé

A hydraulic control valve is provided, which can prevent the occurrence of overload by relieving hydraulic fluid of a return line in which the overload occurs due to an inertial force of a rotator when a hydraulic motor that is operated by the hydraulic fluid supplied from a hydraulic pump stops halfway. The hydraulic control valve includes a valve block in which a first pump path and second pump paths are formed, a spool shiftably coupled to the valve block to control the hydraulic fluid supplied to a hydraulic motor, first and second actuator paths connecting the second pump paths to first and second actuator ports according to the shifting of the spool, tank paths connecting the first and second actuator paths to a hydraulic tank according to the shifting of the spool, first to fourth flow paths in which first to fourth check valves are installed, respectively, a path having one end communicating with a crossing part between the first and third flow paths and the other end communicating with a crossing unit between the second and fourth flow paths, and a relief valve installed in the path to relieve hydraulic fluid in one of the first and second actuator ports in which the overload occurs and to provide a supplement supply of the relieved hydraulic fluid to the other actuator port in which the overload does not occur.

Classes IPC  ?

• F15B 13/04 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs pour utilisation avec un servomoteur unique

Abrégé

A hydraulic system with an improved complex operation is provided, which can prevent the generation of shock in a boom by delaying pressure supply during start and end of pilot signal pressure supplied to a spool for controlling an option device when a boom ascending operation and an operation of an option device are simultaneously performed or when such a simultaneous operation of the boom and the option device switches over to an independent operation of the boom. The hydraulic system with an improved complex operation includes main hydraulic pumps and a pilot pump; a boom cylinder and an option device; a main control valve including a boom spool and an option device spool which are shifted by a pilot signal pressure from the pilot pump; an operation lever which controls the boom spool; an option operation pedal which controls the option device spool; a confluence spool for controlling the option device; and a controller which outputs an electric control signal to a proportional control valve for the option device so as to delay pilot signal pressure supplied to the confluence spool during start and end of the pilot signal pressure supply when a complex operation for simultaneously operating the boom cylinder and the option device is performed.

Classes IPC  ?

• F16D 31/02 - Accouplements ou embrayages à fluide avec des groupes de pompage du type volumétrique, c.-à-d. dans lesquels passe un volume déterminé de liquide par tour de pompe utilisant des pompes à pistons ou à plongeurs travaillant dans des cylindres

Abrégé

An antitheft system and method for construction equipment is disclosed. The antitheft system and method can prevent the construction equipment from driving if a driver gets out of a cabin in the state in which an ignition is turned on so as to preheat a heater or engine or in a case where a driving unit is not manipulated during a predetermined period.

Classes IPC  ?

• B60R 25/00 - Équipements ou systèmes pour empêcher ou signaler l’usage non autorisé ou le vol de véhicules

Abrégé

An apparatus for cooling overheated gas generated from a diesel particulate filter which is connected between a diesel engine and an exhaust pipe of the diesel engine is disclosed. The apparatus includes a tail pipe for discharging outwardly the overheated gas discharged from the diesel particulate filter, a cooling fan, provided at one side of an engine room, for generating an air stream by sucking ambient air, and a diffuser enclosing an outer circumference of the tail pipe in such a way a space is formed between the diffuser and the tail pipe to prevent the diffuser from directly contacting the tail pipe. The engine room is provided with a through-hole penetrating one side of the engine room, and the tail pipe has one end connected to the diesel particulate filter, and the other end extended outwardly from the engine room through the through-hole.

Classes IPC  ?

• F01N 3/00 - Silencieux ou dispositifs d'échappement comportant des moyens pour purifier, rendre inoffensifs ou traiter les gaz d'échappement

Abrégé

A method for preventing overturning a dump vehicle, the vehicle including a forward vehicle section with a forward frame and a wheel axle supported by the frame. The dump vehicle further includes a rear vehicle section with a rear frame and at least one wheel axle supported by the frame. The dump vehicle further includes an articulation joint, which connects the forward frame and the rear frame and allows the forward frame and the rear frame to pivot in relation to each other about an axis extending in a longitudinal direction of the vehicle. During a tilting procedure for unloading material from a container of the dump vehicle, the method includes determining if there is a risk for a pair of wheels of the wheel axle of the forward vehicle section to lose ground contact or if the pair of wheels have already lost ground contact. A warning signal for preventing an uncontrolled rotation of the forward vehicle section relative to the rear vehicle section via the articulation joint is further established when it is determined that the wheels of the forward wheel axle have lost or are about to lose ground contact.

Classes IPC  ?

• B60P 1/16 - Véhicules destinés principalement au transport des charges et modifiés pour faciliter le chargement, la fixation de la charge ou son déchargement avec un mouvement de basculement de l'élément supportant ou contenant la charge actionné par un fluide

Abrégé

Provided is a construction equipment cab having a protective structure capable of protecting an operator from injury due to deformation of a cab in the event of a rollover accident. The construction equipment cab is mounted on an upper swivel body, and the protective structure is mounted on the cab and the upper swivel body and protects an operator from the cab in a rollover accident. The construction equipment cab includes a lower panel provided at a rear lower portion of the cab to be sunk in a forward direction in order to secure a space in which the protective structure is held, and a unit for fixing the protective structure held in the space to the upper swivel body and the cab.

Classes IPC  ?

• B62D 33/06 - Cabines de conducteur

Abrégé

A traveling system for construction equipment is provided, which can secure an initial traveling manipulability regardless of a low-speed traveling or a high-speed traveling. If the high-speed traveling is selected and the traveling is manipulated, the inclination angle of a swash plate of a hydraulic pump is variably controlled, so that the discharge flow rate of the hydraulic pump exceeds a predetermined flow rate in comparison to the low-speed traveling.

Classes IPC  ?

• G06F 19/00 - Équipement ou méthodes de traitement de données ou de calcul numérique, spécialement adaptés à des applications spécifiques (spécialement adaptés à des fonctions spécifiques G06F 17/00;systèmes ou méthodes de traitement de données spécialement adaptés à des fins administratives, commerciales, financières, de gestion, de surveillance ou de prévision G06Q;informatique médicale G16H)

Abrégé

A pressure control valve is provided, which can variably control the set pressure of a relief valve in accordance with pilot signal pressure that is controlled in an operator's seat and so on when the set pressure of the relief valve required in a replaced working device is changed.

Classes IPC  ?

• F16K 31/12 - Moyens de fonctionnementDispositifs de retour à la position de repos actionnés par un fluide
• F16K 31/36 - Moyens de fonctionnementDispositifs de retour à la position de repos actionnés par un fluide et dans lesquels il y a alimentation constante du moteur à fluide par le fluide provenant de la canalisation
• F16K 31/00 - Moyens de fonctionnementDispositifs de retour à la position de repos
• F16K 39/00 - Dispositifs pour relâcher la pression sur les faces d'un joint d'étanchéité

Abrégé

An upper frame for construction equipment mounted to swing on a lower driving structure is provided, in which fixing pins for supporting a boom and a boom cylinder are coupled to left and right side plates that are welded on a base plate to face each other, and a plate-shaped joint connection plate is welded on the left and right side plates and the base plate, so as to support the left and right side plates by exhibiting the rigidity and flexibility against load being transferred to the fixing pins through a working device during working. The upper frame includes a base plate on which a driving means for swing the upper frame is mounted, left and right side plates vertically welded on the base plate to face each other and composed of inner and outer vertical plates to which a boom and a boom cylinder are rotatably fixed by fixing pins, respectively, and a joint connection plate having both sides welded on inner sides of the inner vertical plates and a lower end part welded on the base plate and supporting the left and right side plates by exhibiting rigidity and flexibility when reaction load from the boom is generated on the fixing pins due to load generated on the working device during working.

Classes IPC  ?

• B62D 23/00 - Châssis et carrosserie combinés, c.-à-d. construction monocoque

Abrégé

An excavator mounted with tanks having side doors. Bend-formed side doors are mounted on outer sides of a hydraulic fluid tank and a fuel tank that are welded structures mounted on an upper frame of the excavator, have the same curved surfaces as an external shape of the equipment, so that no precise tank manufacturing work is required and welded portions of the tanks are prevented from being exposed to an outside.

Classes IPC  ?

• B60R 21/13 - Arceaux de sécurité

Abrégé

A hydraulic control valve for heavy equipment is provided, which includes a valve body having a supply passage supplied with a hydraulic fluid from a hydraulic pump, ports for supplying the hydraulic fluid to an actuator or receiving the hydraulic fluid from the actuator, tank passages for returning the hydraulic fluid from the actuator to a hydraulic tank, and a first regeneration passage for supplying a part of the returned hydraulic fluid to the supply passage; a spool slidably installed in the valve body in accordance with supply of a pilot signal pressure from an exterior, and controlling flow of the hydraulic fluid supplied to the actuator from the supply passage during shifting; and a regeneration valve installed between the first regeneration passage and the tank passage, and including a piston moved by the hydraulic fluid from the hydraulic pump, a regeneration spool shifted by pressure fluctuation of the supply passage to variably adjust a flow rate of the hydraulic fluid discharged from the first regeneration passage to the tank passage via a return passage, a first resilient member for resiliently supporting the regeneration spool in a direction opposite to a shifted direction of the regeneration spool, and a pilot piston for resiliently supporting a set pressure of the first resilient member.

Classes IPC  ?

• F15B 13/043 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs pour utilisation avec un servomoteur unique actionnés par la pression du fluide avec clapets-pilotes commandés électriquement
• F15B 13/04 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs pour utilisation avec un servomoteur unique
• E02F 9/22 - Entraînements hydrauliques ou pneumatiques
• F15B 13/02 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs

Abrégé

Heavy equipment having a tool box opening in forward direction of the equipment is provided, in which a tool box door mounted on an upper frame of an excavator can be simply opened and closed through pressing of a button, an auxiliary structure, such as a handrail that is used when an operator ascent toward an engine room, is not required, and the shape of the tool box door can be freely designed to sufficiently secure storage space. The heavy equipment includes a lower driving structure; an upper frame mounted on the lower driving structure to be swiveled; a cap and an engine room mounted in front and in the rear of the upper frame; working devices including a boom fixed to the upper frame, an arm, a bucket, and hydraulic cylinders for driving the boom, the arm, and the bucket, respectively; a counter weight mounted in the rear of the upper frame to keep the balance of the equipment during working; a tool box door mounted on the upper frame to open from the rear to the front side of the equipment, and forming storage space; and a gas spring for opening the tool box door when a button mounted on an external surface of the tool box door is pressed.

Classes IPC  ?

• B60R 9/02 - Accessoires supplémentaires extérieurs au véhicule, pour recevoir des charges, p. ex. des bagages, des engins de sport ou des objets similaires sur les côtés, p. ex. sur les marchepieds

Abrégé

A double check valve having a floating function is disclosed, which can prevent construction equipment from overturning through intercepting of a floating function even if a signal pressure is fed to the double check valve to perform the floating function in a state that an excavator is supported by a working device (e.g. a dozer blade), i.e. in a jack-up state, on a sloping site and so on. The double check valve includes a hydraulic pump; a hydraulic cylinder connected to the hydraulic pump to operate a working device; a control valve installed in flow paths between the hydraulic pump and the hydraulic cylinder, and shifted to control a start, a stop, and a direction change of the hydraulic cylinder; and a double check valve installed in flow paths between the control valve and the hydraulic cylinder, and including a pair of plungers having first diaphragms formed thereon to receive an operating pressure being applied to the hydraulic cylinder and second diaphragms formed thereon to receive a signal pressure being applied to the signal pressure flow path, and a pair of check valves being pressed to remove their check function through shifting of the plungers. Sectional areas of the first diaphragms and the second diaphragms are different from each other.

Classes IPC  ?

• F15B 13/01 - Clapets de blocage ou autres dispositifs de détente
• E02F 3/84 - Entraînement ou dispositifs de commande correspondants

Abrégé

An operator's seat for heavy equipment having optimized switch arrangements for controlling the equipment is provided, in which arrangements of various kinds of switches and components of operating devices that are frequently used by an operator in the seat due to the characteristic of the equipment are integrated within a radius that an operator's hand reaches (i.e. in a hand arm operation zone), and thus physical inconvenience and fatigue that the operator who repeatedly operates working devices for a long time suffers can be reduced. The operator's seat for heavy equipment includes a switch instrument installed within a radius that a hand of an operator sitting in the operator's seat reaches, a control lever mounted on a specified position of the switch instrument to control operations of working devices, and switches arranged on the switch instrument in closest proximity to the control lever so that the operator in the operator's seat can operate the switches in the closest position in which the operator does not invade a control stroke zone of the control lever.

Classes IPC  ?

• B60K 26/00 - Agencement ou montage sur les véhicules des dispositifs de commande des ensembles de propulsion

Abrégé

A console box for heavy equipment having a safety bar with a function sound device is provided, which generates a function sound when an operator rotates a safety bar to be in a horizontal/vertical direction, so that the operator can accurately recognize the rotation state of the safety bar. The heavy equipment console box includes a console box mounted on a left/right side of an operator's seat, and having an operation lever, installed thereon, for controlling an operation of a working device; a cover formed on an outer side surface of the console box mounted on a doorway side of a cab, and having first and second locking grooves formed on an outer side surface thereof; a safety bar, movably fixed to the outer side surface of the cover, for controlling an electric signal being applied to the operation lever when the safety bar is rotated to be in a horizontal/vertical direction; and a function sound generation part, mounted on an inner side surface of a main body of the safety bar, for being detachably engaged with first and second locking grooves to generate a function sound when the safety bar is rotated to be in the horizontal/vertical direction.

Classes IPC  ?

• B06D 1/28 -

Abrégé

A traveling device for crawler type heavy equipment is provided, which can improve manipulability by preventing an abrupt decrease/increase of a traveling speed of the equipment when a combined operation, in which a left/right traveling device and a working device are simultaneously driven, is performed. The traveling device for crawler type heavy equipment includes a variable orifice shifted to intercept the supply of the hydraulic fluid toward the traveling device in response to the signal pressure in the combined working mode if a load pressure of the working device is relatively higher than that of the traveling device.

Classes IPC  ?

• F15B 11/00 - Systèmes de servomoteurs dépourvus d'asservissement
• B62D 11/06 - Direction pour roues non orientablesDirection pour véhicules à chenilles ou à dispositifs similaires par entraînement différencié des éléments en contact avec le sol sur les côtés opposés du véhicule par une seule source d'énergie principale

Abrégé

A hydraulic circuit for construction equipment is disclosed, which can prevent an abrupt rotation of a swing device when a switching valve for the swing device is shifted in a state that switching valves for a traveling device and a working device have been shifted.

Classes IPC  ?

• F16D 31/02 - Accouplements ou embrayages à fluide avec des groupes de pompage du type volumétrique, c.-à-d. dans lesquels passe un volume déterminé de liquide par tour de pompe utilisant des pompes à pistons ou à plongeurs travaillant dans des cylindres

Abrégé

A hydraulic circuit for preventing a change of stroke of a boom cylinder or an arm cylinder during transportation. The hydraulic circuit includes first and second hydraulic pumps, a boom cylinder, an arm cylinder, a boom confluence logic valve, a first port connected with a chamber of the boom cylinder in a housing in which a spool for the boom cylinder is shiftably installed, a second port connected with a hydraulic tank in the housing, and a first orifice formed between the housing and a land part of the spool for the boom cylinder located between the first port and the second port. During transportation, a small amount of hydraulic fluid fed from the second hydraulic pump to the large chamber of the boom cylinder drains to the hydraulic tank through the first orifice to prevent a change of stroke of the boom cylinder.

Classes IPC  ?

• F16D 31/02 - Accouplements ou embrayages à fluide avec des groupes de pompage du type volumétrique, c.-à-d. dans lesquels passe un volume déterminé de liquide par tour de pompe utilisant des pompes à pistons ou à plongeurs travaillant dans des cylindres

Abrégé

An apparatus for easing an impact on a boom of an excavator and a method of controlling the same are disclosed, which can minimize the vibration occurring in the boom due to the impact on a boom cylinder by actively controlling an amount of hydraulic fluid being supplied to the boom cylinder when the operation of the boom cylinder is suddenly stopped due to an operator's sudden manipulation of an operation lever for a working device. The apparatus includes first and second hydraulic pumps; a boom cylinder; a main control valve; an operation lever for supplying pilot signal pressure to a spool of the main control valve when an operator manipulates the operation lever; operation lever detection means for detecting boom up and boom down signal pressures according to an amount of manipulation of the operation lever; boom cylinder pressure detection means for detecting pressures generated in a large chamber and a small chamber of the boom cylinder; a controller for calculating and outputting a control signal of the main control valve if the boom cylinder has been suddenly stopped; and boom vibration preventing means for controlling the pilot signal pressure being supplied from the second hydraulic pump to the main control valve.

Classes IPC  ?

• F16D 31/02 - Accouplements ou embrayages à fluide avec des groupes de pompage du type volumétrique, c.-à-d. dans lesquels passe un volume déterminé de liquide par tour de pompe utilisant des pompes à pistons ou à plongeurs travaillant dans des cylindres

Abrégé

A straight traveling hydraulic circuit is disclosed, which, in the case of performing a combined operation in which working and traveling devices are simultaneously driven, can prevent a declination of equipment due to an overload of the working devices. A straight traveling valve is shifted to supply the hydraulic fluid from the first hydraulic pump to the left and right traveling motors and to supply the hydraulic fluid from the second hydraulic pump to the first and second working devices. A control valve connects inlet and outlet parts of the straight traveling valve, and is shifted, when the combined operation is performed, to intercept a supply of the hydraulic fluid from the second hydraulic pump to the traveling motor.

Classes IPC  ?

• F16D 31/02 - Accouplements ou embrayages à fluide avec des groupes de pompage du type volumétrique, c.-à-d. dans lesquels passe un volume déterminé de liquide par tour de pompe utilisant des pompes à pistons ou à plongeurs travaillant dans des cylindres

Abrégé

An axle locking cylinder structure is capable of enabling an operator of heavy construction equipment to stably carry out an axle locking operation since a sudden variation of the flow rate is prevented in the axle locking cylinder by draining a highly-pressurized flow rate slowly at the release of axle locking and supplying a flow rate quickly at the drive of axle locking. A highly-pressurized hydraulic fluid can be steadily drained from a cylinder chamber since an opening region between a poppet valve and a pilot flow path is enlarged so as to open the pilot flow path connected to the cylinder chamber during a relatively long time. A cylinder rod can be quickly expanded according to the manipulation of an axle locking switch by compensating a flow rate supplied to a cylinder chamber when the cylinder rod is expanded.

Classes IPC  ?

• E02F 9/22 - Entraînements hydrauliques ou pneumatiques
• B60G 17/005 - Dispositions de blocage de la suspension

Abrégé

The invention relates to wheel axle bearing arrangement comprising a wheel axle housing (16) and a wheel axle support (17), which is configured to be rigidly connected to a vehicle frame, and a bearing means (19) configured to pivotably mount the wheel axle housing (16) relative to the wheel axle support (17). The bearing means (19) comprises at least two bearing sleeves (24,25) arranged side by side.

Classes IPC  ?

• B60G 9/02 - Suspensions élastiques d’un essieu rigide ou d’un carter d’essieux pour plusieurs roues l'essieu ou le carter étant montés à pivot sur le véhicule

Abrégé

A structure of an upper frame for supporting a cabin of construction machinery, whereby, in the event of a rollover accident, an excessive vertical load or rearward load applied to a cabin structure is primarily dispersed by a reinforcing member of the cabin structure, and the dispersed load is supported by a separate cabin supporting structure, so that the plastic deformation of the cabin structure can be minimized.

Classes IPC  ?

• B62D 33/06 - Cabines de conducteur

Abrégé

An operator protective structure for a construction machine is designed to prevent a heavy object or a cabin of the construction machine deformed during the overturning or a drop collision from injuring a body of the operator. An operator protective structure includes a front supporting frame provided with a pair of front supporting rods vertically installed on one end of the upper frame, a rear supporting frame provided with a plurality of rear supporting rods vertically installed on the other end of the upper frame to encompass the cabin, and a top supporting frame defined by a pair of top supporting rods extended from an upper end of the front supporting frame to an upper end of the rear supporting frame and provided with a plurality of auxiliary beams between the top supporting rods.

Classes IPC  ?

• B60J 7/00 - Toits amoviblesToits avec panneaux mobiles

Abrégé

The present invention relates to a safety lever system in a cab of an excavator, which is capable of preventing an unintended descending of a control box without the operation of the safety lever, and promoting a safer tilting of the control box through a limit means that controls the power application/short-circuit. According to the present invention, if the operator tilts the control box to get in or get out of the cab, the safety lever system shunts (i.e., short-circuit) the power of the control lever or the control box. Therefore, the possibility of malfunction of the excavator due to the miss-operation of the operator is very slim, and the control box cannot be returned to its original position unless the operator operates the safety lever again. This structural improvement of the safety lever eliminates a possibility of the malfunction of the excavator due to the operator's mistake, and markedly increases the reliability of the excavator.

Classes IPC  ?

• B60D 1/28 - Couplages de tractionAttelagesOrganes de tractionDispositifs de remorquage caractérisés par des dispositions en vue de fonctions particulières pour empêcher un décrochage fortuit, p. ex. accessoires de sécurité