EP0349359A1 - Torque or moment limiting system for hoisting devices - Google Patents
Torque or moment limiting system for hoisting devices Download PDFInfo
- Publication number
- EP0349359A1 EP0349359A1 EP89401460A EP89401460A EP0349359A1 EP 0349359 A1 EP0349359 A1 EP 0349359A1 EP 89401460 A EP89401460 A EP 89401460A EP 89401460 A EP89401460 A EP 89401460A EP 0349359 A1 EP0349359 A1 EP 0349359A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- torque
- moment
- reading
- limiting system
- flow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/24—Safety devices, e.g. for preventing overload
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/88—Safety gear
- B66C23/90—Devices for indicating or limiting lifting moment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/88—Safety gear
- B66C23/90—Devices for indicating or limiting lifting moment
- B66C23/905—Devices for indicating or limiting lifting moment electrical
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- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C5/00—Ladders characterised by being mounted on undercarriages or vehicles Securing ladders on vehicles
- E06C5/32—Accessories, e.g. brakes on ladders
- E06C5/36—Safety devices against slipping or falling of ladders; Safety devices against overloading ladders
Definitions
- the present invention relates to a torque or moment limiting system for lifting devices.
- the present invention proposes to provide a system capable of reacting in real time with respect to a moment exerted by a determined exchange rate, on the turret of a lifting machine, so as to prevent or dissuade the user from doing carry out movements with the hoist likely to aggravate this state of charge.
- the present invention applies more particularly without being limited thereto, to mobile cranes, auxiliary cranes, nacelles or the like.
- the idea underlying the present invention consists in digitally interpreting the force which is applied in the lifting cylinder (s) of the arm of the lifting machine, as well as the relative value of the lever arm of this or of these lifting cylinders with respect to the articulation axis of the arm and then to exploit the digital information after processing so as to limit the movements of the crane without however immobilizing or blocking it, in order to allow a return operating conditions in the normal chart given by the manufacturer.
- the device according to the present invention responds to a double concern, on the one hand ensuring the safety of a lifting machine and on the other hand maintaining the reliability of this machine, even in conditions close to dangerous operating zones as defined by the manufacturer.
- the subject of this invention is a torque or moment limiting system for lifting devices such as in particular mobile cranes, auxiliary cranes, nacelles or derivatives, characterized in that it comprises: - Means ensuring the reading of the various parameters which make it possible to calculate the torque or the moment exerted at any time on the turret of the lifting machine by a determined state of load; - an electronic computer ensuring the integration of the values collected by said measurement and reading means and allowing the calculation of the torque or the moment by delivering binary information "0" or "1" indicating whether one is in the abacus load defined by the construct or outside this abacus, and a hydraulic system receiving the information delivered by said computer and acting on the control device of the lifting machine in order to slow down or possibly to prohibit any movement likely to worsen the state of charge when the information delivered is "1".
- said reading means are constituted by a set of proportional inclinometers allowing the determination of the angular position of the articulated arm of the lifting machine and that of its control jack, or by an optical reading system of a micro-etching produced on the rod of the control cylinder and making it possible to know the stroke at a given instant or by a flow meter positioned so as to measure the variations in the volume of the hydraulic fluid in the cylinder (or cylinders) of the control cylinder (s) of the lifting machine, this flow meter automatically resets itself at the end of travel of the cylinder (s).
- said hydraulic system comprises a solenoid valve which deflects the nominal flow rate of the hydraulic pump supplying the lifting device, generating movements towards the hydraulic fluid reservoir, while maintaining the pressure of use in the circuit, this flow being diverted to a flow limiting means so as to allow passage to the movements only a small leakage flow allowing a very limited movement of the arm of the lifting machine.
- FIG. 1 the load P manipulated by the hook of the crane is represented and which is located at a distance D from the axis of rotation of the turret T of this crane.
- P1 is the value of the pressure of the hydraulic fluid in the jack V for controlling the first articulated arm of the crane;
- S1 is the area of action of the hydraulic pressure in this jack V, this area is of course constant and
- d represents the (variable) lever arm for applying the hydraulic force to the first articulated arm of the crane, as has shown in Figure 1.
- This value can therefore be calculated from the angular positions ⁇ 1, ⁇ 2, ⁇ 3 of the first articulated arm of the crane, as shown in Figure 1 or from the stroke C1 of the rod of the lifting cylinder V or from the volume Q1 of the hydraulic fluid contained at the instant determined in the cylinder of this jack V.
- ⁇ 1, ⁇ 2 or ⁇ 3 can be read using a conventional system of proportional inclinometers, C1 can be read from an optical reading of a micro-etching carried out on the cylinder rod V and Q1 can be read from a flow meter that automatically adjusts itself to the end stop of the jack V.
- the information sent by the computer is delivered to a solenoid valve A through which the supply of the operating pressure Pu of the lifting cylinder V takes place, from a hydraulic pump Q.
- the hydraulic circuit comprises a bypass D on which a flow limiter L has been interposed. It is understood that the information delivered by the computer deviates the nominal flow rate of the hydraulic pump Q , which generates the movements towards the hydraulic fluid reservoir, while maintaining the operating pressure Pu in the circuit, allowing only a leakage flow to pass through the movements, thanks to the flow limiter L, allowing extremely limited movement, for example of a milimetric nature, of the mobile elements of the crane.
- the electrical signal delivered by the computer is therefore used to act on the hydraulic system AL, so as to considerably reduce the flow rate usable for the movements of the crane, so that the time necessary to carry out movements with the handling arms of this crane becomes important for the user, which dissuades him from exceeding the resistance limits of the crane set by the load chart given by the manufacturer.
- the system which is the subject of the present invention fulfills the double objective of reliability and safety which it has set itself given that the movements made by the handling arms of the lifting machine when approaching dangerous zones defined by the manufacturer are done at very low speed, which avoids inertial movements harmful to the hoist and in particular to its stability.
Abstract
Description
La présente invention est relative à un système limiteur de couple ou de moment pour des engins de levage. La présente invention se propose d'apporter un système apte à réagir en temps réel par rapport à un moment exercé par un état de change déterminé, sur la tourelle d'un engin de levage, de manière à empêcher ou dissuader l'utilisateur de faire effectuer à l'engin de levage des mouvements susceptibles d'aggraver cet état de charge.The present invention relates to a torque or moment limiting system for lifting devices. The present invention proposes to provide a system capable of reacting in real time with respect to a moment exerted by a determined exchange rate, on the turret of a lifting machine, so as to prevent or dissuade the user from doing carry out movements with the hoist likely to aggravate this state of charge.
La présente invention s'applique plus particulièrement sans pour autant y être limitée, aux grues mobiles, grues auxiliaires, nacelles ou équivalents.The present invention applies more particularly without being limited thereto, to mobile cranes, auxiliary cranes, nacelles or the like.
L'idée à la base de la présente invention consiste à interpréter de façon numérique l'effort qui est appliqué dans le ou les vérins de levage du bras de l'engin de levage, ainsi que la valeur relative du bras de levier de ce ou de ces vérins de levage par rapport à l'axe d'articulation du bras puis d'exploiter ensuite l'information numérique après traitement de manière à limiter les mouvements de la grue sans toutefois l'immobiliser ou la bloquer, afin de permettre un retour des conditions de fonctionnement dans l'abaque normal donné par le constructeur.The idea underlying the present invention consists in digitally interpreting the force which is applied in the lifting cylinder (s) of the arm of the lifting machine, as well as the relative value of the lever arm of this or of these lifting cylinders with respect to the articulation axis of the arm and then to exploit the digital information after processing so as to limit the movements of the crane without however immobilizing or blocking it, in order to allow a return operating conditions in the normal chart given by the manufacturer.
On comprend que le dispositif selon la présente invention répond à une double préoccupation, d'une part assurer la sécurité d'un engin de levage et d'autre part maintenir la fiabilité de cet engin, même dans des conditions proches des zones dangereuses de fonctionnement telles que définies par le constructeur.It is understood that the device according to the present invention responds to a double concern, on the one hand ensuring the safety of a lifting machine and on the other hand maintaining the reliability of this machine, even in conditions close to dangerous operating zones as defined by the manufacturer.
En conséquence, cette invention a pour objet un système limiteur de couple ou de moment pour engins de levage tels que notamment grues mobiles, grues auxiliaires, nacelles ou dérivés, caractérisé en ce qu'il comprend :
- des moyens assurant la lecture des différents paramètres qui permettent de calculer le couple ou le moment exercés à tout instant sur la tourelle de l'engin de levage par un état de charge déterminé ;
- un calculateur électronique assurant l'intégration des valeurs recueillies par lesdits moyens de mesure et de lecture et permettant le calcul du couple ou du moment en délivrant une information binaire "0" ou "1" indiquant si l'on est dans l'abaque de charge défini par le constructure ou en dehors de cet abaque, et
- un système hydraulique recevant l'information délivrée par ledit calculateur et agissant sur le dispositif de commande de l'engin de levage afin de ralentir ou éventuellement d'interdire tout mouvement susceptible d'aggraver l'état de charge lorsque l'information délivrée est "1".Consequently, the subject of this invention is a torque or moment limiting system for lifting devices such as in particular mobile cranes, auxiliary cranes, nacelles or derivatives, characterized in that it comprises:
- Means ensuring the reading of the various parameters which make it possible to calculate the torque or the moment exerted at any time on the turret of the lifting machine by a determined state of load;
- an electronic computer ensuring the integration of the values collected by said measurement and reading means and allowing the calculation of the torque or the moment by delivering binary information "0" or "1" indicating whether one is in the abacus load defined by the construct or outside this abacus, and
a hydraulic system receiving the information delivered by said computer and acting on the control device of the lifting machine in order to slow down or possibly to prohibit any movement likely to worsen the state of charge when the information delivered is "1".
Selon un mode de réalisation préféré de la présente invention, lesdits moyens de lecture sont constitués par un ensemble d'inclinomètres proportionnels permettant la détermination de la position angulaire du bras articulé de l'engin de levage et de celle de son vérin de commande, ou par un système de lecture optique d'une micro-gravure réalisée sur la tige du vérin de commande et permettant d'en connaître la course à un instant considéré ou par un débit-mètre positionné de manière à mesurer les variations du volume du fluide hydraulique dans le cylindre (ou les cylindres) du ou des vérins de commande de l'engin de levage, ce débit-mètre se recalant automatiquement en butée de fin de course du ou des vérins.According to a preferred embodiment of the present invention, said reading means are constituted by a set of proportional inclinometers allowing the determination of the angular position of the articulated arm of the lifting machine and that of its control jack, or by an optical reading system of a micro-etching produced on the rod of the control cylinder and making it possible to know the stroke at a given instant or by a flow meter positioned so as to measure the variations in the volume of the hydraulic fluid in the cylinder (or cylinders) of the control cylinder (s) of the lifting machine, this flow meter automatically resets itself at the end of travel of the cylinder (s).
Selon au autre exemple de réalisation préféré de cette invention, ledit système hydraulique comprend une électrovanne qui dévie le débit nominal de la pompe hydraulique alimentant l'engin de levage, générant les mouvements vers le réservoir de fluide hydraulique, tout en maintenant la pression d'utilisation dans le circuit, ce débit étant dévié vers un moyen limiteur de débit afin de ne laisser passer vers les mouvements qu'un faible débit de fuite permettant un déplacement très limité du bras de l'engin de levage.According to another preferred embodiment of this invention, said hydraulic system comprises a solenoid valve which deflects the nominal flow rate of the hydraulic pump supplying the lifting device, generating movements towards the hydraulic fluid reservoir, while maintaining the pressure of use in the circuit, this flow being diverted to a flow limiting means so as to allow passage to the movements only a small leakage flow allowing a very limited movement of the arm of the lifting machine.
D'autres caractéristiques et avantages de la présente invention ressortiront de la description faite ci-après en référence au dessin annexé qui en illustre un exemple de réalisation dépourvu de tout caractère limitatif. Sur le dessin :
- La figure 1 représente en élévation latérale une grue à laquelle est appliqué le système limiteur de couple objet de la présente invention et
- La figure 2 est un schéma illustrant le système limiteur de couple selon l'invention.
- FIG. 1 shows in side elevation a crane to which the torque limiting system object of the present invention is applied and
- FIG. 2 is a diagram illustrating the torque limiting system according to the invention.
On se réfère en premier lieu à la figure 1. Sur cette figure, on a représenté la charge P manipulée par le crochet de la grue et qui est situé à une distance D par rapport à l'axe de rotation de la tourelle T de cette grue. Le couple M exercé sur la tourelle T par la charge est :
M = P x D.
L'image du couple M sur la tourelle est donc:
M = P x D = P1 x S1 x dFirstly, reference is made to FIG. 1. In this figure, the load P manipulated by the hook of the crane is represented and which is located at a distance D from the axis of rotation of the turret T of this crane. The torque M exerted on the turret T by the load is:
M = P x D.
The image of the couple M on the turret is therefore:
M = P x D = P1 x S1 xd
P1 est la valeur de la pression du fluide hydraulique dans le vérin V de commande du premier bras articulé de la grue ; S1 est la surface d'action de la pression hydraulique dans ce vérin V, cette surface est bien entendu constante et d représente le bras de levier (variable) d'application de la force hydraulique sur le premier bras articulé de la grue, comme on l'a représenté sur la figure 1.P1 is the value of the pressure of the hydraulic fluid in the jack V for controlling the first articulated arm of the crane; S1 is the area of action of the hydraulic pressure in this jack V, this area is of course constant and d represents the (variable) lever arm for applying the hydraulic force to the first articulated arm of the crane, as has shown in Figure 1.
Par conséquent, la valeur qui doit être calculée afin de connaître à tout instant le moment M appliqué par la charge P sur la tourelle T pour un état de charge déterminé, est d x P1 (en tenant compte du fait que la surface S1 est une constante).Consequently, the value which must be calculated in order to know at all times the moment M applied by the load P on the turret T for a determined state of charge, is dx P1 (taking into account the fact that the surface S1 is a constant ).
Cette valeur peut donc être calculée à partir des positions angulaires α1, α2, α3 du premier bras articulé de la grue, comme représenté sur la figure 1 ou à partir de la course C1 de la tige du vérin de levage V ou à partir du volume Q1 du fluide hydraulique contenu à l'instant déterminé dans le cylindre de ce vérin V.This value can therefore be calculated from the angular positions α1, α2, α3 of the first articulated arm of the crane, as shown in Figure 1 or from the stroke C1 of the rod of the lifting cylinder V or from the volume Q1 of the hydraulic fluid contained at the instant determined in the cylinder of this jack V.
Selon la présente invention, α1, α2 ou α3 peuvent être lus à l'aide d'un système classique d'inclinomètres proportionnels, C1 peut être lu à partir d'une lecture optique d'une micro-gravure réalisée sur la tige du vérin V et Q1 peut être lu à partir d'un débit-mètre se recalant automatiquement en butée de fin de course du vérin V.According to the present invention, α1, α2 or α3 can be read using a conventional system of proportional inclinometers, C1 can be read from an optical reading of a micro-etching carried out on the cylinder rod V and Q1 can be read from a flow meter that automatically adjusts itself to the end stop of the jack V.
On a représenté de façon schématique sur la figure 2 un exemple de réalisation d'un système limiteur de couple selon la présente invention.There is shown schematically in Figure 2 an embodiment of a torque limiting system according to the present invention.
Les différentes variables α1, α2, α3, C1, Q1 permettant comme on l'a vu ci-dessus de connaître à tout instant le moment M appliqué sur la tourelle de la grue sont donc déterminées par les moyens précisés ci-dessus et les signaux obtenus sont transmis à un calculateur électronique qui permet d'intégrer les valeurs obtenues pour délivrer une information "0" ou "1" signalant que l'on est dans l'abaque de charge ou hors de l'abaque de charge défini par le constructeur. Ainsi qu'on l'a déjà indiqué, cette information est utilisée pour ralentir ou interdire tout mouvement de la grue susceptible d'aggraver son état de charge.The different variables α1, α2, α3, C1, Q1 allowing, as we have seen above, to know at all times the moment M applied to the crane turret are therefore determined by the means specified above and the signals obtained are transmitted to an electronic computer which makes it possible to integrate the values obtained to deliver information "0" or "1" signaling that one is in the load chart or out of the load chart defined by the manufacturer . As already indicated, this information is used to slow down or prohibit any movement of the crane liable to worsen its state of charge.
Dans l'exemple de réalisation non limitatif illustré par la figure 2, l'information émise par le calculateur est délivrée à une électrovanne A au travers de laquelle s'effectue l'alimentation en pression d'utilisation Pu du vérin de levage V, à partir d'une pompe hydraulique Q. Selon l'invention, le circuit hydraulique comporte une dérivation D sur laquelle on a interposé un limiteur de débit L. On comprend que l'information délivrée par le calculateur dévie le debit nominal de la pompe hydraulique Q, qui génère les mouvements vers le réservoir de fluide hydraulique, tout en maintenant la pression d'utilisation Pu dans le circuit, ne laissant passer vers les mouvements qu'un débit de fuite, grâce au limiteur de débit L, permettant un déplacement extrêmement limité, par exemple d'ordre milimétrique, des éléments mobiles de la grue.In the nonlimiting exemplary embodiment illustrated in FIG. 2, the information sent by the computer is delivered to a solenoid valve A through which the supply of the operating pressure Pu of the lifting cylinder V takes place, from a hydraulic pump Q. According to the invention, the hydraulic circuit comprises a bypass D on which a flow limiter L has been interposed. It is understood that the information delivered by the computer deviates the nominal flow rate of the hydraulic pump Q , which generates the movements towards the hydraulic fluid reservoir, while maintaining the operating pressure Pu in the circuit, allowing only a leakage flow to pass through the movements, thanks to the flow limiter L, allowing extremely limited movement, for example of a milimetric nature, of the mobile elements of the crane.
Le signal électrique délivré par le calculateur est donc utilisé pour agir sur le système hydraulique AL, de manière à diminuer considérablement le débit utilisable pour les mouvements de la grue, afin que le temps nécessaire pour effectuer des mouvements avec les bras de manutention de cette grue devienne important pour l'utilisateur, ce qui le dissuade de dépasser les limites de résistance de la grue fixées par l'abaque de charge donné par le constructeur.The electrical signal delivered by the computer is therefore used to act on the hydraulic system AL, so as to considerably reduce the flow rate usable for the movements of the crane, so that the time necessary to carry out movements with the handling arms of this crane becomes important for the user, which dissuades him from exceeding the resistance limits of the crane set by the load chart given by the manufacturer.
Le système objet de la présente invention remplit bien le double objectif de fiabilité et de sécurité qu'il s'est fixé étant donné que les mouvements effectués par les bras de manutention de l'engin de levage aux approches des zones dangereuses définies par le constructeur se font à très petite vitesse, ce qui permet d'éviter les mouvements d'inertie néfastes à l'engin de levage et en particulier à sa stabilité.The system which is the subject of the present invention fulfills the double objective of reliability and safety which it has set itself given that the movements made by the handling arms of the lifting machine when approaching dangerous zones defined by the manufacturer are done at very low speed, which avoids inertial movements harmful to the hoist and in particular to its stability.
Il demeure bien entendu que la présente invention n'est nullement limitée aux exemples de réalisation décrits et représentés ici mais qu'elle en englobe toutes les variantes.It remains to be understood that the present invention is in no way limited to the exemplary embodiments described and shown here, but that it encompasses all variants thereof.
Claims (5)
- des moyens assurant la lecture des différents paramètres (α1, α2, α3, C1, Q1) qui permettent de calculer le couple ou le moment (M) exercés à tout instant sur la tourelle (T) de l'engin de levage par un état de charge déterminé;
- un calculateur électronique assurant l'intégration des valeurs recueillies par lesdits moyens de mesure et de lecture et permettant le calcul du couple ou du moment en délivrant une information binaire "0" ou "1" indiquant si l'on est dans l'abaque de charge défini par le constructeur ou en dehors de cet abaque, et
- un système hydraulique (A, D, L) recevant l'information délivrée par ledit calculateur et agissant sur le dispositif de commande de l'engin de levage afin de ralentir ou éventuellement d'interdire tout mouvement susceptible d'aggraver l'état de charge lorsque l'information délivrée est "1".1- Torque or moment limiting system for lifting devices such as in particular mobile cranes, auxiliary cranes, nacelles or derivatives, characterized in that it comprises:
- means ensuring the reading of the various parameters (α1, α2, α3, C1, Q1) which make it possible to calculate the torque or the moment (M) exerted at all times on the turret (T) of the lifting machine by a determined state of charge;
- an electronic computer ensuring the integration of the values collected by said measurement and reading means and allowing the calculation of the torque or the moment by delivering binary information "0" or "1" indicating whether one is in the abacus load defined by the manufacturer or outside this chart, and
- a hydraulic system (A, D, L) receiving the information delivered by said computer and acting on the control device of the lifting machine in order to slow down or possibly prohibit any movement likely to worsen the state of charge when the information delivered is "1".
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8808605 | 1988-06-27 | ||
| FR8808605A FR2633268B3 (en) | 1988-06-27 | 1988-06-27 | TORQUE OR MOMENT LIMITING SYSTEM FOR LIFTING MACHINES |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0349359A1 true EP0349359A1 (en) | 1990-01-03 |
Family
ID=9367756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89401460A Withdrawn EP0349359A1 (en) | 1988-06-27 | 1989-05-29 | Torque or moment limiting system for hoisting devices |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0349359A1 (en) |
| FR (1) | FR2633268B3 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2678256A1 (en) * | 1991-06-27 | 1992-12-31 | Neotec Dev | Device for controlling and limiting the tilting torque of a bracket, particularly for supporting a handling arm |
| WO1993019000A1 (en) * | 1992-03-23 | 1993-09-30 | Hiab Ab | Hydraulic crane with increased maximum lifting power in the high-position area, and method therefor |
| FR2691185A1 (en) * | 1990-10-31 | 1993-11-19 | Samsung Heavy Ind | Control system to automatically prevent overloading of an excavator. |
| FR2796059A1 (en) * | 1999-07-07 | 2001-01-12 | Liebherr Werk Ehingen | CONTINUOUSLY ADJUSTABLE CRANE |
| CN103018602A (en) * | 2012-12-06 | 2013-04-03 | 中联重科股份有限公司 | Moment limiter testing device, moment limiter testing system and moment limiter testing method |
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|---|---|---|---|---|
| FR2166087A1 (en) * | 1971-12-29 | 1973-08-10 | Unic Corp | |
| FR2256101A1 (en) * | 1973-12-28 | 1975-07-25 | Biron Didier | Telescopic jib crane overload protection system - compares jib angle derricking force with permissible maxima |
| FR2300035A1 (en) * | 1975-02-04 | 1976-09-03 | Krueger & Co Kg | CONTROL DEVICE FOR THE OPERATING MECHANISM OF THE Boom of a Crane |
| FR2320894A1 (en) * | 1975-08-14 | 1977-03-11 | Forney International | LOAD MEASURING AND DISPLAY DEVICE FOR A VARIABLE LENGTH ARM CRANE |
| DE2659755A1 (en) * | 1976-12-31 | 1978-07-06 | Krueger & Co Kg | DEVICE FOR SENDING A SET POINT SIGNAL FOR A MONITORING DEVICE OF A JIB CRANE OR THE LIKE. |
| DE2836337A1 (en) * | 1978-08-19 | 1980-02-28 | Magirus Deutz Ag | Turntable ladder excessive tilt prevention control - has computer comparing separate control units data for operation interruption or continuation |
| GB2050294A (en) * | 1979-05-18 | 1981-01-07 | Coles Cranes Ltd | Safe load indicator |
| FR2497851A1 (en) * | 1981-01-12 | 1982-07-16 | Mascha Roger | Dangerous working condition electronic analyser for excavator - has elongation, pressure and flow sensors for each jack and inclinometer to determine and prevent dangerous sequence of manoeuvres |
| FR2534643A1 (en) * | 1982-10-15 | 1984-04-20 | Bennes Marrel | Hydraulic circuit loading monitor for mobile crane |
| EP0154069A2 (en) * | 1984-03-08 | 1985-09-11 | Merryweather And Sons Limited | A control system for an elevatable and extendible structure |
-
1988
- 1988-06-27 FR FR8808605A patent/FR2633268B3/en not_active Expired - Fee Related
-
1989
- 1989-05-29 EP EP89401460A patent/EP0349359A1/en not_active Withdrawn
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2166087A1 (en) * | 1971-12-29 | 1973-08-10 | Unic Corp | |
| FR2256101A1 (en) * | 1973-12-28 | 1975-07-25 | Biron Didier | Telescopic jib crane overload protection system - compares jib angle derricking force with permissible maxima |
| FR2300035A1 (en) * | 1975-02-04 | 1976-09-03 | Krueger & Co Kg | CONTROL DEVICE FOR THE OPERATING MECHANISM OF THE Boom of a Crane |
| FR2320894A1 (en) * | 1975-08-14 | 1977-03-11 | Forney International | LOAD MEASURING AND DISPLAY DEVICE FOR A VARIABLE LENGTH ARM CRANE |
| DE2659755A1 (en) * | 1976-12-31 | 1978-07-06 | Krueger & Co Kg | DEVICE FOR SENDING A SET POINT SIGNAL FOR A MONITORING DEVICE OF A JIB CRANE OR THE LIKE. |
| DE2836337A1 (en) * | 1978-08-19 | 1980-02-28 | Magirus Deutz Ag | Turntable ladder excessive tilt prevention control - has computer comparing separate control units data for operation interruption or continuation |
| GB2050294A (en) * | 1979-05-18 | 1981-01-07 | Coles Cranes Ltd | Safe load indicator |
| FR2497851A1 (en) * | 1981-01-12 | 1982-07-16 | Mascha Roger | Dangerous working condition electronic analyser for excavator - has elongation, pressure and flow sensors for each jack and inclinometer to determine and prevent dangerous sequence of manoeuvres |
| FR2534643A1 (en) * | 1982-10-15 | 1984-04-20 | Bennes Marrel | Hydraulic circuit loading monitor for mobile crane |
| EP0154069A2 (en) * | 1984-03-08 | 1985-09-11 | Merryweather And Sons Limited | A control system for an elevatable and extendible structure |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2691185A1 (en) * | 1990-10-31 | 1993-11-19 | Samsung Heavy Ind | Control system to automatically prevent overloading of an excavator. |
| FR2678256A1 (en) * | 1991-06-27 | 1992-12-31 | Neotec Dev | Device for controlling and limiting the tilting torque of a bracket, particularly for supporting a handling arm |
| WO1993019000A1 (en) * | 1992-03-23 | 1993-09-30 | Hiab Ab | Hydraulic crane with increased maximum lifting power in the high-position area, and method therefor |
| FR2796059A1 (en) * | 1999-07-07 | 2001-01-12 | Liebherr Werk Ehingen | CONTINUOUSLY ADJUSTABLE CRANE |
| CN103018602A (en) * | 2012-12-06 | 2013-04-03 | 中联重科股份有限公司 | Moment limiter testing device, moment limiter testing system and moment limiter testing method |
| CN103018602B (en) * | 2012-12-06 | 2015-08-05 | 中联重科股份有限公司 | Limiter of moment proving installation, system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2633268A1 (en) | 1989-12-29 |
| FR2633268B3 (en) | 1991-05-31 |
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