TWENTY THREE TON PICK AND CARRY CRANE
WITH OPTIMIZED ARTICULATION
Technical field of invention:
The invention disclosed here is related to a new pick and carry (PnC) crane with a limit of maximum 23 tons at 1.5m radius and the lift is upto the height of 19 meters, towards load picking, according to the load chart of the proposed crane herein; where several important components of the said crane are uniquely designed with novel structural and/or functional features and wherein these components are integrated & installed together in a very non-conventional manner towards better load handling, more balance and complete safety, even in the steered condition of the heavily loaded crane. Due to special designing of various components of the proposed crane and their non-conventional installation thereof, the proposed crane provides better vision to the driver/operator with better control over every functioning of the proposed crane, better serviceability of its components, and prolonged service-life. Background and objective of the invention:
There are basically three types of pick and carry mobile road mounted cranes - lattice boom crawler cranes, articulated non-slewing cranes and rough terrain hydraulic slewing. For picking up load and transporting it to a particular destination through road/ground/concrete yard or port, these mobile cranes are used. A crane holding the heavy load is very prone to instability and tilting, therefore it requires too much precaution in handling such mobile loaded machine, especially on critical/uneven road conditions or in unfavorable weather conditions.
Depending on the requirement of the maximum load handling upto certain height, several types of mobile cranes are available. As very high costs are involved in
manufacturing of a huge off-highway vehicle like a mobile crane, therefore such cranes are designed and manufactured for several specific combinations of load values and height upto which the load has to be lifted, wherein the factors like load value and the height of load-lift are particularly guided by a standard load chart.
Though there are so many mobile cranes and related literature are available in public domain with variable features, satisfying different safety norms and guiding factors/regulations under one or another territory/country, and regular research and development activities are going on towards creating better such machine with better structural and functional features, till date the conventional pick and carry (PnC) cranes, particularly in India, have several limitations as under:
(i) Basic structure of the mobile crane, particularly of low load carrying pick and carry crane, is tractor mounted;
(ii) Normally a PnC has sliding mesh transmission;
(iii) PnC has limitation to maximum lifting capacity, reach, travel order height, speed and gradeability;
(iv) Operator visibility is restricted;
(v) Serviceability of AGB and accessibility is limited;
(vi) Two bodies (front and rear) of conventional cranes are joined through link-plate at top and directly joined/coupled at bottom, prone to high instability and reduced load holding ability;
(vii) In conventional PnC crane, the position of Boom is such that either it obstructs the operator's vision or it creates a psychological safety fear to the operator;
(viii) Conventional Cranes have a rigid chassis i.e. no suspension system.
In light of the aforementioned limitations associated with conventional pick and carry (PnC) cranes, the present invention is intended to design and manufacture a new pick and carry crane with virtually no drawback, as mentioned hereinabove,
particularly in a specific load handling range upto twenty three tons. The objective of the present invention, the statement of the present invention, summary of the invention, the detailed description of the invention with the help of certain illustrative schematic drawings, and the claims herein are substantially described one by one hereinafter.
Objective of the present invention:
1. Prime objective is to manufacture a new pick and carry crane (PnC) with optimized articulation, hydrostatic transmission & industrial axle, where the proposed crane has a limit of maximum 23 tons at 1.5m radius and the reach is upto 19 meters, guided by the load-chart of this proposed crane, towards load picking and carrying capacity; wherein the proposed crane is not a tractor based crane but is based on a uniform rigid platform made up of standard channels/plate sections.
2. Another important objective pf the present invention is to design and manufacture a pick and carry crane with twenty three ton load handling capacity at 1.5m radius (guided by the load chart herein), which possess several novel and/or advanced structural and functional features, such as compact main boom, advanced driver's cabin with less fatigue & step-less speed control, rear end mounted engine with reduced noise level at operator cabin, improved visibility, better operation-ability better maneuverability, optimized articulation point, excellent stability with suitably positioned customized Luff cylinders, with better serviceability and easy parts replacement etc.
3. Other important objective is to manufacture the proposed PnC crane ensuring greater stability by means of wide wheel-base cum wheel-track & good load carrying capacity of tyres, redesigning & better positioning of boom, optimized articulation point, wide spaced Luff cylinders etc., wherein the proposed crane preferably consists of two pairs of front tyers and only one pair of rear tyres, equivalent to said two pairs of front tyers, mainly in terms of load carrying.
4. Other important objective of the present invention is manufacture the proposed pick and carry crane wherein the Front Body mainly comprises of the driver's/operator's cabin and the compact boom assembly mounted above the said cabin; and wherein the compact boom assembly is mounted in such a manner using widely spaced Luff cylinders, positioned as per four bar mechanism, that both of them take the central position on the main front frame.
5. Other important objective of the present invention is to manufacture a pick and carry crane wherein the Rear Body mainly contributes towards an industrial drive line unit of the crane, and wherein the said Rear Body is mainly installed upon an uniquely designed main rear frame, which rests on rear tyres integrated with the suspended type rear drive axle; and wherein the said Rear Body mainly comprises of engine-radiator assembly, positioned at the rear most end of the crane, properly configured with the power transmission mechanism via an auxiliary gear box (AGB).
6. An important objective is to adapt the concept of the AAT (Articulation Axis Tilt), towards better stability of the loaded and/or articulated crane.
7. Another objective is to design a crane with a telescopic load carrying capacity of 8-9 ton.
8. Another objective is to manufacture proposed PnC crane with a lower approach height boom assembly with 'U' pressing feature, wherein applying a new compact & shorter main boom and consequently leading to easy accessibility and better serviceability/maintenance/replacement of various machine components.
9. Another objective of the invention is to manufacture the proposed PnC crane with higher road speed and minimum creep speed to reduce dynamic impact on machine.
10. Another objective of the invention is to create extra safety features like downhill/uphill tilt articulation angle and safe load indicator.
Statement of the invention:
The present invention is intended to propose a Twenty three ton pick and carry crane with optimized articulation, where the proposed crane has a limit of 23 tons at
1.5m radius, guided by the load-chart of this proposed crane, towards load picking & carrying capacity; and where the proposed crane is not a tractor based crane but is based on a uniform rigid platform made up of standard channel/plate sections (front as well as rear); and wherein it involves/comprises of several better and advanced features, namely: introduction of an optimized steering mechanism for the proposed PnC crane by optimizing the articulation point, based on the concept of the AAT (Articulation Axis Tilt), towards better stability of the loaded and/or articulated crane; hydrostatic transmission & industrial drive axle duly configured with an auxiliary gear box (AGB), particularly installed at the uniquely designed main rear frame of the Rear Body, acting as the drive line unit of the proposed crane; wide wheel-base cum wheel-track & good load carrying capacity of tyres; suspended type rear drive axle; better central positioning of the compact boom assembly and the driver's/operator's cabin on the uniquely designed front main frame of the Front body of the crane using wide spaced Luff cylinders, positioned as per four bar mechanism; preferably two pairs of front tyers and only one pair of rear tyres, equivalent to said two pairs of front tyers, mainly in terms of load carrying; telescopic load carrying capacity of 8-9 tons; higher road speed and minimum creep speed to reduce dynamic impact on machine; extra safety features like safe load indicator and several new/improved features namely advanced driver's cabin with less fatigue & step less speed control, rear end mounted engine with reduced noise level at operator cabin, improved visibility, better operation-ability, better maneuverability, optimized articulation point, excellent stability with suitably positioned customized Luff cylinders, with better serviceability and easy parts replacement etc. Summary of the description:
The present invention is related to manufacturing of a new pick and carry crane, especially designed to pick and carry a lode of maximum 23 tons at 1.5m radius and reach upto height of 19 meters, duly guided by the load chart of the proposed crane, wherein this proposed crane has very advanced features towards better balance & stability during load handling; better & wide driver's/operator's visibility; and more
stable & balanced articulation during the steering of the loaded vehicle. The proposed crane has several additional advanced features, incorporated herein to create a new synergistic machine with better safety and aesthetics.
Unlike conventional tractor based pick and carry (PnC) crane, the proposed crane is based on a uniform & standard channel/plate section based rigid platform on 4 wheels at front (non drive end) axle and preferably 2 heavy load carrying wheels at rear differential (drive end) axle, equivalent to said four front wheels. The proposed crane comprises of three main parts:
(i) Drive Line unit of the proposed crane, as the Rear Body;
(ii) Load Handling unit of the proposed crane as the Front Body; and
(iii) A centralized and optimized articulation mechanism supported by hydraulic cylinders, for integrating and hinging the said Front body and the Rear Body, towards more stable and balanced steering of the proposed crane, even in loaded condition on uneven road condition.
The Rear Body, which is designed as an exclusive industrial drive line unit of the proposed crane, consists of a rigid frame made up of channel/plate sections and is spring mounted on rear drive axle. It further comprises of several components, mainly the engine assembly, the power transmission shaft assembly including the gear box and the auxiliary gear box (AGB), the suspended type rear spring on hanger bracket, multiple counter weights (preferably rear & side), fuel tank, hydraulic oil tank, optional stepney, if required. Mounting of various important components in this embodiment of the proposed machine is very unique. Here the engine assembly and the gear box are positioned at the rear most side, i.e. just in opposite side of the boom assembly. A power transmission can be easily serviced and in a better manner. The tyres used in the Rear Body, attached with suspended type rear axle provide extra shock absorbent comfort to the proposed pick and carry (PnC) crane. Except the essential components like engine assembly and the power transmission shaft assembly, the positioning and mounting of other various components on the Rear Body, namely the fuel tank, the hydraulic oil tank, the counter weights etc. on the
main rear frame normally does not involve substantial innovation and is a matter of aesthetics, and economical interests. The rear deck/platform on the Rear Body can be of certain subsequent application, depending on the requirements. The rear deck/platform is effectively kept at considerable low height so that the components installed on the main rear frame can be reached easily for serviceability or any such treatment thereof; and further the driver/operator, sitting in his/her cabin may have comfortable and clear rear-view.
The Front Body is also mounted on a rigid base made up of standard plate section, suitable for load handling; mainly resting on front non-drive axle at front side and at other end is hinged with the Rear Body through the optimized articulation mechanism. The Front body mainly comprises of centrally positioned an advanced driver's/operator's cabin, the extendable Boom assembly and the widely spaced Luff cylinders mounting around the said driver's/operator's cabin, wherein the mother boom of the said extendable boom assembly comes above the said cabin. The Luff cylinders are widely spaced, extra strong, and are positioned as per four bar mechanism in a manner that the combined height of the Boom assembly reduces considerably. The position of the driver's cabin is in the center of the front body to have a clear view of the movement of boom, especially when the crane is loaded and moving. Working of crane boom remains up to a comfortably accessible/serviceable height. The compact boom assembly is installed with wire rope reeved through pulleys for extension/retraction and finally Luff cylinders. The boom assembly of the proposed crane is very much customized for better stability, movement, accessibility and serviceability in terms of 'U' pressing feature, synchronized extension and retraction mechanism, rope compensation mechanism, slotted and two way traveling hooks on the first extension boom etc.
Front Body and the Rear Body of the proposed crane are joined and integrated together at an optimized articulation point, in such a manner that it not only creates a suitable load handling platform for the proposed crane, but also provides maximum stability to the proposed machine. The proposed joining and integration of Front and
Rear bodies of the proposed crane at the said articulation point is preferably based on the novel concept of Articulation Axis Tilt (AAT), wherein the actual axis of articulation is sifted from the vertical line towards the Rear body by certain very small angle, preferably in the range of 0° to 6°. By such tilt in the Articulation Axis, better load handling capacity in the steered condition of the vehicle can be achieved, which is virtually same as in case of the straight position of the vehicle. Various precise advantages of the present inventions are:
• Compact Main Boom.
• Higher road speed so lesser traveling time.
• Lower creep speed so less dynamic affect on machine with higher load.
• Less fatigue to the operator while changing speed.
• Less noise to the operator from the engine.
• Walkthrough cabin
• Application of the concept of AAT.
• Closed loop hydraulic circuit resulting in optimum hydraulic oil requirement.
• Wide span luff cylinder resulting in better crane stability
• Excellent all around visibility
• Low development cost, spare part cost & fast track development
• Better Ergonomics & Aesthetics.
• Low height Boom for reaching to low height structures like Malls etc.
• Comfortable Approach height of hook with a negative angle of boom.
• Wide rear deck can be utilized as per agreed requirement.
• Better serviceability
• Better Stability particularly in steered condition.
• Stepney provision as an optional.
Detailed description of the present invention with the help of the attached drawings:
The present invention is described herein with the help of certain most relevant
illustrative schematic drawings, where the important structural and functional features
of the proposed crane therein are duly labeled with certain numerical symbols. A brief
detail of the attached drawings is as followed:
Figure 1: It represents the schematic isometric view of the proposed Twenty
three ton pick and carry crane with optimized articulation mechanism. Figure 2: Represents the schematic load-chart prescribed for the proposed crane,
wherein the said load-chart is in accordance with the Lifting capacity
standards PER-IS:4573-1982. Figure 3: It shows one schematic view of Main Front Frame on which the Front
Body has been installed. Figure 4: It shows one schematic view of advanced cabin which has various new
features. Figure 5: It provides one schematic view of Main Rear Frame of the Rear Body
on which various components of the Rear Body are installed. Figure 6: It shows the schematic drawing of the Auxiliary Gear Box (AGB),
incorporated in the power transmission shaft assembly, providing a
virtual 'V shape to the said transmission shaft assembly. Figure 7: It shows the complete schematic view of the mode of transmission in
the proposed crane, wherein the power transmission shaft assembly is
properly configured with the engine assembly through gear box and
AGB, at the rear side of the Rear Body of the proposed crane. Figure 8: It provides the schematic view of articulation point where the Front
Body and the Rear Body of the proposed crane are integrated/hinged
together in the most optimized manner. Figure 9: It shows one schematic view of complete boom assembly. Figure 1 shows the complete schematic isometric view of proposed twenty three ton pick and carry crane 1. All the major components, integrated together to create the proposed crane are depicted here, namely the Front Body 2, and the Rear Body 6;
wherein the said Front Body 2 mainly comprising of two pairs of front tyers 3, driver's/operator's cabin 4, and load handling components (boom assembly and its mounting mechanism) 5; and wherein the Rear Body as the exclusive drive line unit of the crane rests on its rear tyers 7, and mainly comprises of the engine assembly, power transmission shaft assembly and other supportive components thereof (not shown in figure 1).
The proposed crane follows the load chart, as shown in figure 2, which provides the guideline for safe lifting of maximum load and the limit of the height 19m, upto which certain load should be lifted at the rate 1.5 meters, depending on this chart. The load-chart is prepared on the basis of extensive analysis of the load lifting and carrying capacity of the proposed crane. Here it is important that usually a crane in its articulated body-condition handles comparatively lesser amount of the load in comparison to its straight body-condition. But the proposed crane, due to special feature of articulation axis tilt (AAT), is capable of lifting and carrying much improved quantity of load, even in its articulated body-condition.
The Main Front Frame 8 of the proposed twenty three tons pick and carry crane, as depicted in figure 3, comprises of positions and arrangements thereof as its structural features, for mounting of various devices towards creation of the Front Body 2 of the proposed crane 1. Important positions/arrangements on the Main Front Frame 8 are represented by several numerical symbols, namely towards front non-drive axle mounting 9, the driver's/operator's cabin mounting 10, front bumper mounting 11, Luff cylinder bracket 12, boom mounting bracket 13, front body articulation hinge mounting bracket 14 etc. Two most important and unique structural aspects of the main front frame are the provisions for central positioning of the driver's/operator's cabin (not shown in figure 3), just after the front bumper 11; and secondly the provision for mounting the compact boom assembly (not shown in figure 3) around & above the cabin by mounting the base of the said boom assembly at boom mounting positions 13 on each of the two virtually inclined ends 15a and 16a of the two side frames of the said main front frame 8; duly supported by installation of two widely
spaced heavy load carrying Luff cylinders (not shown in figure 3) at positions 12 on each of the two horizontal wings \5b and \6b of the side frames of the said main frame 8. Thus the Front Body 2 of the proposed crane herein consists of the load handling unit and its control mechanism, installed in the driver's/operator's cabin, but the whole engine assembly and the power transmission assembly are installed on the Rear Body of the crane. The main front frame 8 is designed in such a manner that the driver's cabin as well as the complete installation of the compact boom assembly remains at a reasonable low height so that the total average height of the crane 1 and all the serviceable components of the crane 1 remains at easy reach height and positions thereof.
A driver's/operator's cabin 4, as shown in figure 4, with several advanced features and better visibility is centrally mounted on the Front Body Frame 8, just after the front bumper, The main features of the driver's/operator's cabin 4 are namely extra-large front glass 17, the top glass window 18 to enable visibility at the top, a wide back- window (not shown here), opening at the front lower region for steering column 19, door-openings 20 (both sides) preferably with locking arrangement, sliding side glass window 21 (both sides), very strong roof 22 and the rear toe hooks 35. The cabin 4 is not only designed to facilitate clear front visibility, but also to provide clear view of the boom movement through the top glass window 18 and a clear back-view through wide back-window, especially in case of the loaded crane-body and during steering of the crane. The position of the cabin 4 on Front Body 2 is such that there is no obstacle in front and back of the cabin to restrict the driver's/operator's vision. Since the boom assembly is above the cabin 4, the said cabin's roof is sufficiently strong, and therefore it does not cause any psychological fear to the driver/operator, especially when the load is hanged on the boom at virtually vertical direction. The said cabin is mounted on the Front Body and is positioned adjacent to and in front of the compact boom assembly, mainly covered inside the load handling boom assembly, mounted just behind it on the inclined ends 15a & 16a of the main front frame 8, at comparatively lower height in such a manner that maximum all round
visibility and complete safety/comfort is achieved therein, and wherein the a customized state-of-the-art total control mechanism of the crane towards load picking and carrying is installed inside the said cabin, preferably on the driver's/operator's control panel.
The main rear frame 24 of the Rear Body 6 of the proposed crane 1, as depicted in figure 5, is uniquely designed to create an exclusive drive line unit, preferably the industrial drive line unit, of the proposed crane 1, wherein the said main rear frame 24 is designed with provisions towards installation and customized configuration of all the components responsible for power generation and power transmission, especially the engine assembly, the power transmission shaft assembly, rear drive axle and rear wheel assembly, components of hydraulic mechanism applied therein etc. Main structural features of the said main rear frame 24 as the positions/arrangement for mounting various components of the Rear Body 6, namely the rear body articulation hinge mounting bracket 25, rear steering cylinder mounting brackets 26, the rear drive-axel mounting 27, AGB mounting 28, engine mounting 29, radiator mounting 30, fuel tank mounting 31, hydraulic tank mounting 32, rear counter-weight(s) 33, side counter weight(s) 34, and rear toe hook 35 etc. Due to especial design of the main rear frame 24 of the Rear Body 6 of the proposed crane 1, mainly following goals are achieved:
(i) The engine assembly is kept at the rarest side of the crane 1. (ii) The effective height of the main rear frame 24 is maintained at reasonably lower height, preferably similar as the effective height of the main front frame 8, even though the front tyers and the rear tyers are substantially different in their dimensions, (iii) The combined unit of the engine assembly configured with power transmission shaft assembly, through the gear box and the auxiliary gear box (AGB), is also installed at the rear most region of the Rear body 6, in such a manner that the AGB remains before the rear drive axle, in opposite direction of the engine assembly.
(iv) The Rear Body, with all its components installed properly on the main rear
frame 24, creates a vast uniform flat deck or platform, at very low height,
preferably at such height which not at all restricts the driver's/operator's
back view, wherein the said deck or platform can be utilized for placing
any object/component temporarily or permanently, as the requirement may
occur.
The Rear Body 6, through the rear body articulation hinge mounting bracket 25 of
the main rear frame 24 and the front body articulation hinge mounting bracket 14 of
the main front frame 8, gets integrated and hinged with the Front Body 2 of the
proposed crane 1; wherein the couple of hydraulic cylinders are mounted around the
central articulation point, to support the smooth articulation and steering thereof.
In figure 6, the auxiliary gear box (AGB) 36 is depicted, which helps in creating a 'V
shaped power transmission shaft assembly towards the industrial drive line unit for
the proposed crane 1, wherein the said AGB 36 gets engaged in the said power
transmission shaft assembly at virtually middle position due to its especial structural
and functional features. The said AGB 36 consists of gear shifting arrangement 40 at
its one face, while the motor mounting bracket 38 and output end 39 from AGB, are
on the opposite face therein. The said AGB 36 comprises of the feature of AGB
mounting (both side), as shown by 37.
Figure 7, representing a complete schematic view of the assembly of all the main components, responsible for the power transmission in the proposed crane 1, wherein the whole said assembly towards the mode of transmission is installed on the main rear frame 24 of the Rear Body 6 of the proposed crane 1. The engine 41, preferably the six cylinder engine, is shown at the rarest end of the Rear Body 6 of the crane 1, which consists of components like radiator fan 42, Aux pump 43, and travel pump 44 etc., as schematically shown in the figure herein. The engine assembly 41, through its gear box, is directly coupled to the AGB 36, positioned at the opposite side of the engine assembly 41 towards the front side of the Rear Body 6, somewhere much ahead of the rear drive axle 46 on the main rear frame 24. Further the AGB 36 is
suitably coupled to the differential gear box of the rear drive axle 46 using a strong propeller shaft, wherein the output from the AGB 36 is transmitted to the rear axle 46, as its input, in a direction towards the rear side again. Thus though the coupling between the engine assembly 41 and the AGB 36 is not shown herein to maintain the clarity of representation in the schematic drawing, the power transmission shaft assembly of the proposed crane 1 herein, virtually takes a 'V shape, with the middle position occupied by the said AGB 36.
Front Body 2 and the Rear Body 6 of the proposed crane 1 are integrated and hinged together through an optimized articulation mechanism at an optimized articulation point, as schematically depicted in figure 8. Actually the line passing through the combined articulation pivot holes at central pivot poison(s), as shown by numbers 50 and/or 51 between the front frame pivot plate 48 of main front frame 8 and rear frame pivot plate 49 of the main rear frame 24, is preferably not a vertical line and the said line is preferably tilted towards the Rear Body 6 of the proposed crane 1 by very small angle, mainly in the range of 0° to 6°. The main front frame articulation pivot plates 48 and the rear body articulation pivot plates 49 are arranged together in such a way that the Front Body 2 and the Rear Body 6 get integrated and hinged together at the pivot holes at positions 50 and 51. The hinge arrangement herein is suitably supported by a couple of hydraulic steering cylinders towards smooth and balanced articulation.
The compact boom assembly 5, as depicted in figure 9, is firmly mounted at its boom pivot point 54 with the main front frame 8, at the boom mounting brackets 13. The Luff cylinders are also mounted alongwith the compact boom assembly, wherein the Luff cylinders, at one end, are mounted at Luff cylinder mounting brackets 55 of the mother boom 53, and at another end they are fixed with the main front frame 8 at the Luff cylinder brackets 12, on both the horizontal side frames 15b and \6b. The compact boom assembly 5 comprises of all the state-of-the-art components and mechanism towards load lifting, extension cylinder regulation and rope regulation, mainly such as mother boom 53, first extension 56, second extension 57, jib head 58, snatch block 59, manual extension 60, fixed hooks for loading (preferably 5 in
numbers) 61, and winch 62 etc. The mother boom 53 and the extension cylinders namely 56 & 57 are manufactured based on the concept of U-pressing to provide extra strength to them. Other innovative and novel features, in general, in the proposed crane:
(i) 23 ton lift capacity at 1.5m radius, according to the load chart of the proposed crane.
(ii) Main Front Frame and Rear Frame made out of standard Channel Sections.
(iii) Lower height Booms for easy accessibility & better Visibility.
(iv) Shorter Main Boom with manual extension and provision for adding rhino hook or man carrying basket.
(v) Optimized Articulation Point for better stability in articulated condition.
(vi) Application of concept of AAT.
(vii) Economically designed cabin with for better operator comfort.
(viii) All the serviceable parts located at lower heights. So it can be attended from the floor itself like Boom Pivot Pin, Control Valve, Priority Valve, Luff Cylinder Pins and Body Joining Pins & Bearing.
(ix) Manual boom extension can be fitted and taken out independently.
(viii) Leaf spring Suspension System.
(ix) Industrial Drive Line.
(x) Booms in 'U' Pressing.
(xi) Rope compensation mechanism.
(xii) Synchronized Extension & Retraction rope System.
(xiii) Lockable Chain/Sling Box.
(xiv) Slotted boom for traveling hook on First Extension Boom.
(xv) Better placed Head Lamps & Work Lamps.
An exclusive illustrative specification of various structural and functional features of the proposed twenty three ton pick and carry crane, which is specifically followed for manufacturing the proposed crane, is described as follows:
Specification for TRX 2319
(Table Removed)

We claim:
1. A twenty three ton pick and carry crane with optimized articulation, comprising of a Rear Body, a Front body and an optimized articulation mechanism; wherein the proposed crane is characterized by the limit of its load lifting and carrying capacity as maximum 23 tons at 1.5m radius and upto the height of 19 meters, guided by the load-chart of the proposed crane; and wherein the proposed crane is further characterized by its operation in terms of handling of load and movement of the crane, from the control mechanism installed inside the driver's/operator's cabin, installed on the Front Body, though the drive line unit is on the Rare Body.
2. A twenty three ton pick and carry crane with optimized articulation, as claimed in claim 1, wherein the Rear Body mainly comprises of the main rare frame w ith positions and arrangements thereof for mounting of various devices towards creation of the said Rear Body; the engine assembly, the power transmission shaft assembly, the rear drive axel mounted with rear tyers, fuel tank, hydraulic tank, rear and side counter weights, rear steering cylinder mounting brackets, rear body articulation pivot plate, and toe hook; wherein the said Rear Body is characterized as the actual facilitator of the drive line unit of the proposed crane.
3. A twenty three ton pick and carry crane with optimized articulation, as claimed in claim 1 and 2, wherein the drive line unit is preferably the industrial drive line unit, mainly installed on the Rear Body of the proposed crane, and it comprises of the suitable configuration of the engine assembly with the power transmission shaft assembly through the gear box, the AGB and high torque propeller shafts; wherein the said engine assembly is installed at the rear most end of the main rear frame of the said Rear Body; and wherein the said engine assembly is preferably configured with the said power transmission shaft assembly in such a manner that the said power transmission shaft assembly virtually takes a "V" shape where the gear box, associated with the said engine assembly remains at one end of the shaft assembly, and the differential axle at the rear drive axel remains at the other end of the said shaft assembly; and wherein the said AGB, due to its especial structural & functional features like motor mounting bracket, point for output from AGB, and the gear
shifting arrangement, is mounted on the said main rear frame before the rear drive axle, in the opposite direction of the said engine assembly.
4. A twenty ton pick and carry crane with optimized articulation, as claimed in claim 1, wherein the rear drive axle of the Rear Body of the proposed crane is a suspension type drive axel, mounted with the leaf spring and duly incorporating the differential gear box.
5. A twenty three ton pick and carry crane with optimized articulation, as claimed in claim 1, wherein the Front Body mainly comprises of the main front frame with positions and arrangements thereof for mounting of various devices towards creation of the said Front Body; front non-drive axle, mounted with front wheels; the driver's/operator's cabin, front side bumper, the Luff cylinder(s), compact boom assembly, and front body articulation pivot plate; wherein the state-of-the-art compact boom assembly, mainly comprising of the mother boom, the extension cylinders, the hydraulic mechanism towards regulation of extension cylinders, the rope regulation mechanism including winch, the jib head, the snatch block & load carrying hook is installed around & above the driver's/operator's cabin in such a manner that the total travel order height of the proposed crane is low.
6. A twenty three ton pick and carry crane with optimized articulation, as claimed in claim 1, wherein the articulation mechanism preferably involves the articulation axis tilt (AAT) towards the Rear Body by a small angle, preferably in the range of 0° to 6°; wherein the said articulation mechanism effectively integrates and hinges the Front Body of the proposed crane with the Rear body; and wherein the said articulation involves front frame articulation pivot plates, rear frame articulation pivot plate, articulation body hinge(s), and hydraulic steering cylinders mounted between front and rear steering brackets.
7. A twenty three ton pick and carry crane with optimized articulation, as claimed in claim 1, wherein the driver's/operator's cabin is a walk through type cabin, mainly consists of a front glass, upper glass window, a strong roof, side glass-windows in both sides, opening for steering column, door-openings in both sides with locking arrangements, a wide back-window, sliding glass at the doors, and foot steps
at lower height; wherein the said cabin is mounted on the Front Body and is positioned centrally between the side frames of the main front frame, just after the front bumper and before the boom installation; and wherein the a customized state-of-the-art total control mechanism of the crane towards load picking and carrying is installed inside the said cabin, preferably on the driver's/operator's control panel.
8. A twenty three ton pick and carry crane with optimized articulation, as claimed in claim 1, wherein the installation and integration together of main components of the proposed crane herein, namely the main rear frame, the Rear body, the main front frame, the driver's/operator's cabin, and the compact boom assembly, is such that not only the all-round driver's/operator's visibility is maintained but all the major serviceable/replaceable components remain at low easy reach height and at easy reach positions; and wherein the driver's cabin is duly surrounded by a pair of widely spaced extra strong Luff cylinders in both sides, positioned as per four bar mechanism and is duly covered by the centrally positioned compact boom assembly at its top of the strong roof.
9. A twenty three ton pick and carry crane with optimized articulation, as claimed in claim 1, wherein the Front Body preferably rests on two pairs of equal tyers and the Rear Body preferably rests on one pair of equal tyers, wherein the tyers of Front Body and rear body are selected in such a manner that the rear tyers are virtually equivalent to the front tyers in terms of load handling and balancing the entire crane-body, and wherein the front tyers and rear tyers are mounted to their respective axles in such a way that the they provide wide base to the proposed crane towards better body balance and stability, even in the loaded and/or steered condition.
10. A twenty three ton pick and carry crane with optimized articulation, substantially as herein described and illustrated in the figures of the accompanying drawings.