CA2427405A1

CA2427405A1 - Leveling instrument, an electromechanical lifter and a self leveling integrated lifting system using both of them

Info

Publication number: CA2427405A1
Application number: CA002427405A
Authority: CA
Inventors: Roberto Maggiori
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-11-02
Filing date: 2003-05-01
Publication date: 2004-11-01
Anticipated expiration: 2023-05-01
Also published as: ITRM20010646A1; DE60214966T4; DK1334947T3; ES2273990T3; ITRM20010646A0; CY1106277T1; DE60214966D1; EP1334947A3; EP1334947B1; ATE340759T1; EP1334947A2; CA2427405C; DE60214966T2

Abstract

This self-leveling device is employed in the field of lifting of aircraft, helicopters, civil and military flying vehicles, watercraft, camping vehicles, trains, bridges, radar, etc., and for all those activities that require self leveling and centring during lifting and lowering operations with fast results, without damages to the structure and in perfect safety (eg.: for helicopter lifting, for internal load balance, for safery during take-off and landing). The device is composed of a number of electromechanical lifting groups that operate synchronistically and autonomously from one another, linked with an electronic central general control for operation and a leveling cell. The whole system provides perfect self-leveling in case of unstable ground, for weighing and leveling purposes, targeting, weight balance, maintenance, etc.

Description

A leveling instnzment~ an electromechanical lifter and a self Ievelin~;
integrated lifting system using both of them The object of this application of patent, called Self Leveling Integrated Lifting Device, is employed in the field of lifting devices. In particular, this lifting device is used for lifting and lowering operations, for leveling purpose, for self leveling and weighing of aircrafts, such as aeroplanes, helicopters, civil and military aircrafts, watercraft, camping vehicles and similar, cars and trains, bridges, radar, and any other structure and/or object to which it can be applied.
To the moment, the existing procedures are the following.
In the specific case of the lifting of aeroplanes, helicopters, civil and military aircrafts, the procedure of lifting is made in the following way: are used for operation of weighing, balancing, maintenance and leveling, hydraulic jacks or self assisted for lifting, activated by manual methods. This manual operation is obtained by a minimum of five operators which proceed to this lifting operation with much time of actuation: moreover, could be possible a structural yielding of the hydraulic jack during the operation of Lifting and this may be cause of damages to persons and things.
It is in fact obvious that the manual operation causes instability and lack of precision of the leveling, and consequently it is difficult to bring suitable corrections of the same weight, corrections that axe required for the safety of the flight.
Moreover, the operators move in a state of insecurity and dangerously, because they works under the same aircraft for the proper maneuvers, and they find difficulty in transporting the same hydraulic jacks for the attack upon the linking points of the aircraft; even uncontrolled movements of this aircraft are taken place during lifting and lowering operations, caused by suspensions of the main retractable undercarriages. This happens very frequently, and after many years of verifications in this field, these problems still remain caused to this empiric method of lifting above mentioned.
Then, in the specific field of airlines and transport aeroplanes, civil and military, of transport and similar and however for aircrafts of big dimensions, for the operations of lifting, for balance, for leveling, for maintenance and above all to centre the linking point of the aircraft, are utilzed four hydraulic jacks or self assistant type, and that is; the front one (secondary) two principal centrals, and the auxiliary rear: this one is controlled manually, during the lifting for the proper correction of the weight, because it must have respect of the maximum load allowed by the aircraft specifications of construction and to avoid damages to the structure and at the same time to control the exceeding weight: moreover, dangerous lateral movements of the aircraft load with eventual structural damages of the aircraft can be verified during the operation of lifting and lowering caused to the instability of its linking point and of the its load. To the moment, the operators in order to avoid the disadvantage of lateral movements of the cargo of the aircraft, throw a mineral oil on the ground to make so that the movement of the axis of the linking point comes compensated from the forced sliding. This kind of operation is really difficult. Moreover it is imperfect to foresee more or less the exceeding load of the tail of the aircraft, which cannot exceed the established load of safety. In many cases structural damages of airerafts have been verified.
This Self Leveling Integrated Lifting device brings the following improvements:
It is composed by three or more lifting groups (Fig. O1 and Fig. 10) that are all manufactured with "nut-screw" system (Fig. O1, part. 1) : this lifting group works everyone autonomous or in synchronous speed to have a self leveling operation to reference to a leveling cell (Fig. OS). The agglomerate of this Self Leveling Integrated Lifting device in order to avoid that one of the jacks for effect of instability to the ground doesn't guarantee one perfect adherence, ( as an example during the operations of lifting may happens a separation from the linking points scheduled on the aircrafts and helicopters, etc..), it assure the raising and therefore it allows a perfect weighing and leveling to balance the weight; it is completely automatic only when the linking points scheduled by the aircraft are perfectly adherent to the ground and its linking points; The benefits of this innovation are:
fully electronic management and at distance, only with an operator who with this device operate by few time for the lifting and lowering; to allow the lifting in emergency situations in which is indispensable in few time to supply the apparatus and balance the weight upon the aircraft before the takeoff; reduced maintenance and easy use owned to the considerable mobility of the lifting groups; high safety owned by the use of "nut-screw" penetrable, self blocking, which at the end of the lifting operation, it avoid possible instabilities of the attitutude obtained upon the aircraft, besides accidental lowering. Moreover, an absolutely new feature is :2 representated by the fact that lifting and, therefore, lowering can be obtained in synchronism, with a special floating head for centring operation in case of application to large-dimension aircraft. Another feature is the display of partial and total weights and leveling measurement, this latter being possibly obtained acoustically as well. Self leveling is also useful to operate on mobile surfaces, such as floating platforms, aircraft carriers, etc. In the specific case of various camping vehicles, perfect internal attitude is required for electrical appliances (refrigerators, etc.) and for people inside, independent of the ground the vehicle rests on.
At the moment, in order to obtain perfect attitude, either hydraulic or electrical, manually-controlled jacks are used, which need to be stabilised and levelled by the same user who surveys leveling from inside, through a visual level. It is clear that balancing is not perfect in this case, in particular when the ground below is unstable, which may bring about damages to the vehicle's structure because the jacks are independent and non automatically controlled. The advantages of the Self leveling Integrated Lifting device include perfect load balance and attitude of people inside the vehicle, in addition to increased stability of the vehicle itself, due to the above-described characteristics, since self leveling is performed automatically even in the case of unstable conditions of the gruound. Lifting of bridges for ordinary maintenace, i.e.
replacement of joints and supporto devicesnecessary to check regualrly the bridge stability and capability to sustain load, is today performed by manually-operated hydraulic jacks,zwith subsequent economic losses of manpower and working hours, in addition to possible damage to people or things. Thebenefits of the Self leveling Integrated Lifting device include shorter time for automatic application, with the above-reported characteristics but different capability of resistance to loads in lifting ando lowering, in addition to synchronous, automatic lifting of one or more lifting groups, which avoids possible damage to the strucutreor users. The Self leveling Integrated Lifting device also allows to reduce time losses and overwork for operation and is perfectly safe for the stability of the lifters used by an operator alone.
After these general preliminary remarks, technical description and various designs are reported below for preferred, non-restrictive, realisation of the devise called Self leveling Integrated Lifting.
The lifting device is made of three or more groups of ELECTRO-MECHANICAL
LIFTERS (Fig. O1 and 04), a CENTRAL GENERAL C~NTR~L (Fig. 12), and a LEVELING CELL (Fig. OS). Each ELECTROMECHANICAL LIFTER (Fig.
O1) is constituted by the following elements: a load-bearing base and some supports (Fig. 01, particular 6) equipped with moving wheels (Fig. 01, particular 4), each including the following parts: a jack with ''nut-screw system", i.e. bronze-threaded, penetrating, telescopic screws and bushings with one or more sectors (Fig. 1, particular 1), two accumulators (Fig. OI, particular 9), abattery charger (Fig. 01, particular 7), a reduction unit (Fig. O1, particular 2) a motor (Fig. 01, particular 3) , a run-out switch and synchronism control (Fig. O1, particular 5), electronic control of the above elements (Fig. 01, particular 10), an adhesion sensor (Fig. 01, particular 8) for automatic control of one or more lifting groups and for function of the self leveling mechanism with reference to the LEVELING CELL (Fig. Ol), and a keyboard (Fig. 02). Every lifting group is self functioning, being integrated with an electronic card apparatus (Fig. Ol, particular 10) that can be operated at various degrees of speed or in multiple, for control function in synchronism of every lifting group, with automatic weight control that follows lifting by controlled push of the load. This synchronous control function allows to perform lifting and lowering operations. In case of lifting of large dimension aircraft, due to the impossibility to know any rear-load excess - which cannot be greater than that fixed for safety and centring operations of the aircraft, the lifting system is also provided with an automatic sensor to avoid possible structural damage of the aircraft, also aimed at overcoming difficulties in transport of the lifting system itself. This self adhesion automatic sensor is necessary for multiple control during the synchronous function, and provides perfect lifting and weighing just as all points expected to link to the vehicle are presently and perfecly attached with the liking points, so that any detachment is avoided. Moreover, the lifting group is equipped with a tripod base, with the specific shape arid structure as shown in Fig. 10, and protective fairing which makes orbital and axial movements automatically, and is formed by steel fifth-wheels for support (Fig. 10, particular 2), suitable for acceptable Load. This allows to perform the automatic centring operation by means of a self centring, floating head (Fig. 11), for anchorage with the vehicle's link point and for automatic control of lifting - both upward and downward - in order that exact centring is recovered on a real-time basis to avoid any lateral shifting of the aircraft load.
The self centring floating head (Fig. 11 ) for the specific lifting device at the rear of the aircraft, functions as an automatic control (self controlled version) of the rear shift, by never exceeding the safety load limits given in the aircraft specifications aflter proper calibration. In particular, during lifting and lowering, the following actions take place: two main lifting devices together with the rear lifting group (Fig.
10) start the aircraft detachment from ground. This rear lifting group possesses an automatic weighing system that follows lifting with a controlled-load push. If the load is exceeding or insuff dent for aircraft attitude, as provided for in the aircraft specifications, a load cell - suitably calibrated according to load requirements - stops automatically the whole lifting system by displaying the excess or defect load (safety threshold). After recovering regular attitude, the operation may bee repeated.
These lifting and lowering operations can be performed by a single operation outside the aircraft, who uses a palmar remote control in perfect safety, rapidly and with little energy, thanks to the easy handling of the device (Fig. I0, particulars 6 and 4).
The CENTRAL GENERAL CONTROL (Fig. 12) is composed of a remote control for self leveling and manual operations (Fig. 12, particular 4) plus a system with electrical command card for self leveling, liked with the lifting groups (Fig.
I2, particular I) by means of wires or radio control. The central general control (Fig. 12) is aimed at receiving and processing signals coming from the leveling cell (Fig. OS) through wires linked with the IN-connector of the level (Fig. 12, part. 2). As soon as received, the signals are co-ordinated by the electrical command card. By a series of accumulators (Fig. Ol, part. 9) placed within the lifting groupo, this card supplies the energy necessary for the lifters to start and drives them to their self leveling operation, either in synchronism or singularly. The whole apparatus is enclosed in a portable metal case that allows the user to control and operate the different lifting groups by means of a keyboard (Fig. 12).
The LEVELING CELL (Fig. OS) is an integrated, compact, airtight device with fluid-controlled oscillation that represents constant reference for the whole system, placed within the aircraft by means of a telescopic sustaining pole (Fig. 07), directly linked with the central general control (Fig. 12) or with the electronic command apparatus (Fig. Ol, part. 10) through electric multipolar wire. It is made of the following components: a mechanical pendulum (Fig. 05, sect. C, part. 2) placed on a suitable, highly sensitive, wedge pin (Fig. 0S, sect. B, part. 2) enclosed roan airtight methacrylate cell (Fig. S, sect. B, part. 2), submerged in antifreeze fluid for antishock effect. The leveling cell is enclosed in a suitable container (Fig. 06) together with the following components: external reading sensors (Fig. OS, sect. B, part. 4 -description of mortise positioning of the sensor inside the container Fig.
06), with infrared, photoelectric, or similar power of interception of the mechanical pendulum shifts (Fig. OS), LED for sensor interception and sensitivity regulators for leveling calibration. The leveling cell is equipped with supports appropriate for every kind of means to be lifted and self levelled. Fig. 07 shows a sustaining telescopic pole with a spherical sector that operates in reference to the leveling cell (Fig. OS) whose container (Fig. 06) is placed below the telescopic pole itself in order to make possible amplification of the sensitivity of pendulum shift and, therefore, to attain further leveling precision. The whole system is designed to obtain centring and/or self leveling and/or leveling as a substitute for the currently used plumb line. At the basis of the whole device (including telescopic pole and leveling cell container) there is a "goniometric" support (Figs. 08 and 09). The goniometric support is part of the Self leveling Integrated Lifting device and acts by means ~f an electronic control device for triangulation, which makes easier the shifting of the longitudinal axis for targeting purposes or aircraft attitude simulation. This goniometric support (Figs. 08 and 09) interferes with micrometrical shift by either manual or servo-controlled rotation of a knob (Fig. 08, part. O5; Fig. 09, part. 1 ) placed at the basis of the graduated goniometre to perform manual simulation maneuvers. In fact, by means of the triangulation system for aircraft survey that is present in the goniometric support, which utilizes three special control cells, it allows a single user to perform centring operations automatically, in the shortest operational time and with utmost accuracy.
The leveling cell (Fig. OS) is placed inside the aircraft by means of its support telescopic pole (Fig. 07) and connected through multipolar electric wire to either the electronic command apparatus including an electronic card (Fig. 01, part. 10) placed inside each lifting group (Fig. O 1 ) for autonomous function, or the 1N-connector of the level in the central general control (Fig. 12, part. 2)also provided with electric command card for function in synchronism of the various lifting groups.
Every shift of the mechanical pendulum in the level cell is translated by the external readingsensors into electrical impulses, which in turn are sent to the electronic command system or central general control (Fig. O1, part. 10) through wires and therefore translated into shifts by the electronic card for signal control that interprets them as lifting and/or lowering and moves the lifters.
Figure 01 shows a top-view design of the whole lifting group apparatus without its upper cover. It includes 11 particulars: 1) lifting jack sectors; 2) reduction units; 3) motor; 4) wheels; 5) run-out switch; 6) bearing base and supports; 7) battery-charger;
8) adhesion sensor; 9) accumulators; 10} electronic command system; lI) steering rod.
Figure OZ shows the front-view design of a lifting group with upper cover, including the keyboard , movement wheel and stering rod. It includs 11 particulars; 1) voltage LED; 2) manual/automatic switch; 3) signal entry; 4) up/down knob; 5) ON/OFF
key; 6) lifting jack head; 7) battery disconnecter; 8} battery indicator; 9) steering rod;
10) movement wheel; 11 } wheels.
Figure 03 shows to rear-view design of a lifting group with upper cover including support bases, plus lateral view with upper cover. It includes 5 particulars:
1) lifting jack head; 2) cover; 3) supports; 4) wheels; 5) steeing rod and movement wheel.
Figure 04 shows the top-view of a lifting group with its upper cover. It includes 6 particulars: 1}guidance knob and movement wheel ; 2) keyboard; 3) cover; 4) lifting jack head; 5) wheels; 6) supports.
Figure 04-1 shows the lifting group assembly.
Figure OS shows the level cell. It includes: Section A: I) cover. Section B:
1) wedge pin; 2) antishock cae of the methacrylate cell; 3) projection of the cell antishock case;
4) sensors. Section C: 1) wedge pin slot (sect. B, part. 1); 2) mechanical pendulum;
3) projection of the swaying bell.
Figure 06 shows the leveling cell container. It includes 3 particulars, i.e.
LED, signal entry, tightening.
Figure 07 shows the support telescopic pole. It includes 3 particulars: 1 }
plumb.line reference thrust rod; 2) approach knob; 3} lifting/lowering regulation cursor.
Figure 08 shows model "A" of the goniometric shift system. It includes 5 particulars:
1} clutch of the leveling cell container; 2) threaded internal screw; 3) reference push rod; 4) positioning push rods; 5) regulation knob.
Figure 09 shows model "B" of the goniometric shift system. It includes 3 particulars:
1) regulation knob; 2) clutch of the leveling cell container; 3) reference index of degree shifting.
Figure 10 shows the lifting group with tripod base for large-dimension aircraft. It includes 6 particulars: 1) anti-vibrant supports of the tripod base; 2) fifth wheels with balls; 3) self adhesion automatic sensor; 4) wheels ; 5) lifter housing; 6) motor stewing rod.

Figure 11 shows self centring floating head. It includes 5 particulars: 1) aircraft link point; 2) pin and springs for centring; 3) fifth-wheel with balls; 4) sensors;
5) centring reference pin.
Figure 12 shows the central general control front panel, including 4 particulars: 1 ) IN-connector for signals from lifters; 2) IN-connector of the level; 3) IN-connector of palmar control; 4) manual control.
l

Claims

1. A leveling instrument, characterized by comprising:
a pendulum in the form of a hollow conical body with a downwardly tapered peripheral wall, said hollow conical body having an apex including a center housing which is provided with a vertical through-hole;
a tight pendulum container having a container base provided with a conical center on which said pendulum with its center housing is balanced, the container base being endowed with a circular recess adapted to receive said peripheral wall of the pendulum; said pendulum container having a closure cover to retain said pendulum submerged by a dampening fluid;
a set of C-shaped external sensors positioned under the container base to enclose, like a mortise, said circular recess for the interception of the peripheral wall of the pendulum to detect the position thereof and send relevant information in the form of electrical signals to a control unit;
a vessel enclosing said pendulum container and said set of external sensors.

2. A leveling instrument according to claim 1, wherein said vessel is sustained by a support telescopic pole, having an upper end and a lower end, the support telescopic pole being installed inside a structure to be leveled.

3. A leveling instrument according to claim 2, wherein the upper end of the support telescopic pole is provided with a upper spring-charged push rod having a screw adjusting means.

4. A leveling instrument according to claim 2, wherein the lower end of the support telescopic pole is connected to a goniometric shift device lodging said vessel and comprising an upper portion having a clutch means for the connection with the lower end of a support telescopic pole, a pedestal including lower positioning push rods, a knob controlled shifting means to shift the lower end of the support telescopic pole along a longitudinal direction of the structure to be leveled, a pointer which is coaxial to the support telescopic pole indicating downwardly the position of the support telescopic pole with respect to a scale in the longitudinal direction of the structure to be leveled.

5. A leveling instrument according to claim 1, wherein said vessel is mounted to a goniometric shift device, having a supporting means fixed to the structure to be leveled comprising a base plate which is designed to be tilted with respect to said supporting means and provided with a clutch means for the mounting of said vessel on the goniometric shift device, a knob controlled tilting means to tilt said base plate with respect to said supporting means, a pointer which is fixed to said base plate coaxially to said vessel to indicate the tilt on a goniometer fixed to said supporting means.

6. An electromechanical lifter, comprising a load-bearing base equipped with both wheels and fixed supports, sustaining a motor-controlled nut-screw jack, characterized in that said jack carries on its upper end a self centering floating head for the connection to a link point of a structure to be lifted, head which is provided with position sensors adapted to detect the position of said head and send relevant information in the form of electrical signals to a central control unit.

7. A self leveling integrated lifting system used for lifting and lowering operations, for leveling purpose, for self leveling and weighing aircrafts, watercrafts, and other large structures, characterized by at least a leveling instrument applied to a structure to be lifted and provided of a set of sensors to detect and send level information in the form of electrical signals to a central control unit;
a plurality of electromechanical lifters, each of whom carries on the upper end of its jack a self centering floating head which is provided with position sensors adapted to detect the position of said head and send relevant information in the form of electrical signals to a central control unit; and a central control unit adapted to receive information in the form of electrical signals from said sensors of the leveling instrument and from said position sensors of the plurality of electromechanical lifters and to control said electromechanical lifters for lifting said structure with an accurate leveling.