TWENTY TON PICK AND CARRY CRANE WITH OPTIMIZED ARTICULATION
I. TECHNICAL FIELD OF INVENTION:
The invention disclosed herein is related to a new pick and carry (PnC) crane with a limit of 20 tons load picking & carrying capacity, according to the prescribed load chart of this crane, wherein the proposed crane has several new and advanced structural as well as functional features, namely excellent stability with suitably positioned customized Luff cylinders; better body-balance particularly in loaded as well as articulated conditions; compact main boom with easy operational features; advanced driver's cabin with advanced positioning & better visibility; better operation-ability; better maneuverability, optimized articulation point based on the concept of AAT (Articulation Axis Tilt), with better serviceability and easy parts replacement etc.
II. 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, generally 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 loaded mobile 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. Apart from such normal practice in the field concerned herein, due to continuous advancement in the contemporary science and technology, several R&D activities are also continuously going on in mobile crane manufacturing and its mode of application, specially related to the materials used, mode of operation of the machine, improvement in the machine's quality in terms of its service and maintenance, manufacturing technique etc.
Till this date several specific patents are available for mobile cranes with variable features, satisfying different safety norms and guiding factors/regulations under one or another territory/country, Conventional pick and carry (PnC) cranes, particularly in India, have several limitations as under: (i) Basic structure is tractor mounted which itself has limitations towards load
lifting and carrying, particularly in terms of stability and smoothness/easiness
of operation; (ii) Conventional PnC has sliding mesh transmission; (iii) Conventional PnC has limitation to maximum lifting capacity, reach, travel
order height, speed and gradeability; (iv) Dimension and structure of the operator's cabin, as well as its positioning is
such that the operator's visibility is very much restricted, leading to not very
safe movement/operation of the PnC crane.; (v) Auxiliary gear box (AGB) serviceability and accessibility is limited; (vi) Replacement/maintenance of Extension Cylinder in conventional PnC crane: It
requires entire boom assembly to be taken out, which is a tedious and time
taking job; (vii) 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; (viii) In conventional PnC crane, position of Boom is such that either it obstructs the
operator's vision or it creates a psychological safety fear to the operator; (ix) Conventional Cranes have a rigid chassis i.e. no suspension system.
III. OBJECTIVE OF THE PRESENT INVENTION:
In light of the aforementioned limitations associated with conventional pick and carry (PnC) cranes, objectives of present invention are as under:
1. Primary objective is to manufacture a new pick and carry (PnC) crane with several better and advanced features, wherein the proposed crane has no tractor base and is virtually free from above mentioned demerits.
2. Other important objective is to manufacture the proposed PnC crane ensuring greater stability by means of providing 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.
3. An important objective is to optimize the steering mechanism of 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.
4. Another important objective is to manufacture the proposed PnC crane with load-lift capacity of 20 ton at 1.5m radius and capacity to reach hook height up to 14.5 meters, according to the prescribed load chart of the proposed crane.
5. Another objective is to design a crane with a telescopic load carrying capacity of 8-9 ton.
6. Another objective is to ensure greater visibility for operator/driver by means of better positioning of the boom and the driver's cabin, wherein the said cabin has a wide viewer-window(s) towards all round visibility.
7. 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 involving new concept of Extension Cylinder Housing, and consequently leading to easy
accessibility and better serviceability/maintenance/replacement of various machine components.
8. 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.
9. Another objective of the invention is to create extra safety features like overload sensing device with the proposed crane.
IV. STATEMENT OF THE INVENTION:
The present invention is intended to propose a Twenty ton pick and carry crane with optimized articulation, where the proposed PnC crane is not tractor based and wherein it involves/comprises of several better and advanced features, namely: ensures greater stability by means of providing wide wheel-base cum wheel-track & good load carrying capacity of tyres, redesigning & better positioning of boom, wide spaced Luff cylinders etc.; involves optimized steering mechanism 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; creates a load-lift capacity of 20 ton at 1.5m radius and capacity to reach hook height up to 14.5 meters, according to the prescribed load chart of the proposed crane; creates a telescopic load carrying capacity of 8-9 ton; ensures greater visibility for operator/driver by means of better positioning of the boom and the driver's cabin, wherein the said cabin has a wide viewer-window(s) towards all round visibility; involves lower approach height boom assembly with 'U' pressing feature, wherein applying a new compact & shorter main boom involving new concept of Extension Cylinder Housing, leading to easy accessibility and better serviceability/maintenance/replacement of various machine components; ensures higher road speed and minimum creep speed to reduce dynamic impact on machine; and applies extra safety features like overload sensing device with the proposed crane. The newly proposed PnC crane and its various especial
features, the supporting drawings and the claims for patent protection are substantially described hereinafter.
V. SUMMARY OF THE DESCRIPTION:
The present invention is related to design and manufacturing of a new pick and carry crane with several new and advanced structural and functional features, especially pertaining to load lifting & carrying technology, stability, safety and aesthetics; and more particularly in articulated and/or loaded condition.
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 2 heavy load carrying wheels at rear differential (drive end) axle and 4 wheels at front (non drive end) axle, the proposed crane comprises of three main parts:
(i) Drive Line unit of the proposed crane (hereinafter referred as 'Rear
Body'), and (ii) Load Handling unit of the proposed crane (hereinafter referred as 'Front
Body'), and (iii) An optimized articulation point where these Rear Body and Front Body are integrated together and which plays important role towards a balanced and stable articulation of the vehicle, particularly when the proposed crane is loaded heavily and/or moving.
The Rear Body:
The Rear Body consists of a rigid frame made up of channel/plate sections and is spring mounted on rear drive axle. The Rear Body mainly consists of the engine assembly at its rear side. The Rear Body further comprises of several components, mainly the drive shaft assembly wherein the gear box is suitably configured with the engine assembly, the suspended type rear drive axle, spring on hanger bracket, fuel tank and hydraulic oil tank, counter weight(s), optional stepney etc.
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, which is just in opposite side of the boom assembly. Thus the power transmission can be easily serviced in a better manner. Since the tyres used in the Rear Body, attached with suspended type rear drive axle provide extra shock absorbent comfort to the proposed pick and carry (PnC) crane. The Front Body:
The Front Body is also mounted on a rigid base made up of standard plate section suitable for load handling, wherein the said rigid base rests on front non-drive axle, suitably mounted on wheels, at one end and the other end of the said base is hinged. The Front body mainly comprises of Driver's Cabin assembly, Luff cylinders mounting, and extendable Boom assembly.
The Luff Cylinder and Boom assembly are mounted on the front frame in such a way that they occupy the central position of the machine. The Luff cylinders are suitably placed with wide spacing between them, extra strong, and are positioned as per four bar mechanism in a manner that the combined height of the Boom assembly reduces considerably. Working of crane boom remains up to a comfortably accessible/serviceable height. The compact boom assembly is installed with wire rope reeve through pulleys for extension/retraction and finally Luff cylinders.
As the position of the driver's cabin and the load handling unit of the proposed crane are much before the engine assembly, especially on the front body, therefore the driver/operator has a clear view of the movement of boom, especially when the crane is loaded and moving. 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. The Articulation Point:
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 Articulation Axis tilt is preferably in the range of zero to six degrees, away from the vertical line towards achieving the pre-calculated vehicle's design target of its full load lifting/carrying capacity, particularly in steered condition of the vehicle; and wherein the degree of said tilt (AAT) depends upon certain pre-calculated load lifting/carrying design target for the Off-highway vehicle, particularly for the crane/mobile-crane. Various precise advantages of the present inventions are:
• Compact Main Boom.
• Higher road speed, so lesser traveling time.
• Better visibility and no psychological fear.
• Low development cost & fast track development.
• Better Ergonomics & Aesthetics.
• Low height Boom for reaching to low height structures like Malls, Tunnels etc.
• Comfortable Approach height of hook
• Less spare part cost.
• Better serviceability
• Better Stability particularly in steered condition.
• Stepney provision as an optional.
Other innovative and novel features, in general, in the proposed crane: (i) 20 ton lift capacity at 1.5m.
(ii) Front Frame and Rear Frame, both 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) Ergonomically designed cabin with for better operator comfort, (vii) 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. 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, (xi) Synchronized Extension & Retraction rope System, (xii) Lockable Chain/Sling Box.
(xiii) Slotted boom for traveling hook on First Extension Boom, (xiv) Better placed Head Lamps & Work Lamps.
VI. DETAILED DESCRIPTION OF THE PRESENT INVENTION:
Various structural and functional features of the proposed new 20 ton pick and carry
crane are substantially discussed hereinbelow with the help of certain schematic
drawings attached herein, suitably labeled with numerical symbols.
Short description of the drawings:
Figure 1: It represents the schematic isometric view of the proposed Twenty ton
pick and carry crane with optimized articulation. 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 Frame Rear on which rear body
has been installed.
Figure 4: It shows the complete schematic view of the drive shaft, properly
configured with the engine assembly. Figure 5: It provides one schematic view of main frame of front body on which
front body is installed, alongwith various other parts. Figure 6: It shows one schematic view of advanced cabin which has various new
features. Figure 7: It provides the schematic view of articulation point where front body
and rear body of the proposed crane are integrated/ hinged together. Figure 8: It shows one schematic view of complete boom assembly.
Figure 1 shows the complete schematic isometric view of proposed crane 1. All the major components, integrated together to create the proposed crane are depicted here, namely the front Body mainly comprising of two pairs of front tyers a, driver's/operator's cabin b, load handling components (boom assembly and its mounting mechanism) c; and the Rear Body mainly comprising of rear tyers d, engine assembly e, and the drive line (not shown here) etc.
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 upto which certain load should be lifted. 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 much 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 Frame Rare 2 of the proposed PnC 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 Rear Body of the proposed crane. Important positions/arrangements on the Main Frame Rear 2 are represented by several numerical symbols, namely towards radiator mounting 3, axel mounting
4, AGB mounting bracket 5, fuel tank mounting 6, hydraulic tank mounting 7, rear
counter weight mounting 8, side counter weight mounting 9, rear steering cylinder
mounting 10, rear articulation body hinge mounting 11, and toe hook 12 etc.
The Rear Body of the proposed PnC crane actually facilitates the drive line unit of the proposed crane, wherein the engine assembly 13 is suitably configured with the drive shaft, as depicted by figure 4. The gear box 14, at one end, is directly associated to the engine assembly 13, whereas at its another end it is coupled with the propeller shaft 15a, which is further coupled with the auxiliary gear box (AGB) 16, at point 16a. Further another propeller shaft 15b, coupled with the AGB 16 at its another point 16b, is connected to the differential axle 17 at its point 17a. This differential axle 17, at the rear drive axel of the proposed crane, is connected to rear wheels of the proposed crane (not depicted here) and drives the rear wheels.
The Front Body Frame 18 of the proposed PnC crane 1, as depicted in figure
5, comprises of positions and arrangements thereof as its structural features, for
mounting of various devices towards creation of the Front Body of the proposed
crane 1. Important positions/arrangements on the Front Frame 18 are represented by
several numerical symbols, namely towards front axle mounting 19, the front side
bumper mounting 20, the Luff cylinder mounting 21, boom mounting 22, the front
steering cylinder mounting 23 and the front articulation body hinge mounting 24
etc.
A driver's/operator's cabin 25, as shown in figure 6, with several advanced features and better visibility is mounted on the Front Body Frame 18, just adjacent to the mounting position of the load handling boom, on the front body of the proposed crane. The main features of the driver's/operator's cabin 25 are namely curved front glass 26 to enable visibility at the top, sliding glass 27 on the cabin's door, side triangular glass 28, the hood guard 29 partially covering the curved front glass 27 at its upper region, the door handle 30 with preferably locking arrangement, the door step 31 of the cabin at comparatively lower height, better positioned clutch bracket 32, the toe hook 33 at the top, and a wide back-window for better back view
(not shown here) . The position of the cabin 25 on front body is such that there is no obstacle in front and back of the cabin to restrict the driver's/operator's vision. Though the driver/operator may see through the front-top roof of the cabin, which is actually the curved portion of the front window 26, but it is effectively guarded and covered by the hood guard 29, 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 the compact boom assembly 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.
Front Body and the Rear Body of the proposed crane are integrated and hinged together through an optimized articulation mechanism at an optimized articulation point, as depicted in figure 7. Actually the line passing through the articulation pivot holes at positions 36 of the front frame articulation pivot plates 34 and rear body articulation pivot plates 35, is preferably not a vertical line and is preferably tilted towards the rear body of the proposed PnC crane by very small angle, mainly in the range of 15° to 30°. The front frame articulation pivot plates 34 and the rear body articulation pivot plates 35 are arranged together in such a way that the pivot holes (at position 36) of 34 come just above the pivot holes of 35 (at position 36 too). Then these two pivot plates 34 and 35 are hinged together with the help of articulation body hinges at position 36. At each steering bracket 37, one end of the hydraulic steering cylinder is fixed for supporting smooth and balanced articulation.
The compact boom assembly 38, as depicted in figure 8, is firmly mounted on the Front Body Frame 18, at boom mounting bracket 22 using its boom pivot 39. 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 47 of the mother boom 41, and at another end they are fixed with the Front
Body Frame 18 at the Luff cylinder brackets 21. The compact boom assembly 38 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 41, first extension 42, second extension 43, jib head 44, snatch block 45, rope tensioner 46, winch 40, hook blocks 48 etc. The mother boom 41 and the extension cylinders namely 42 & 43 are manufactured based on the concept of U-pressing to provide extra strength to them.
An exclusive illustrative specification of various structural and functional features of the proposed 20 ton pick and carry crane, which is specifically followed for manufacturing the proposed crane, is described as follows:
Machine Specification: TRX 2014

(Table Removed)
Description of main features of the proposed Twenty ton pick and carry crane with optimized articulation:
i. Excellent front and rear visibility.
ii. Lifting capacity 20MT@1.5mt.
iii. Travel order height is low (suitable for working in housing apartments, malls
and under tunnels.) i v. Easy accessibility of battery and tool box. v. Maximum reach 14.5mt and under hook height 16mt. vi. Easier serviceability, vii. Meets latest emission norms i.e EURO-II viii. Easy accessibility for lifting hooks, ix. With rope compensation and synchronized extension and retraction, x. Booms in 'U' pressing, xi. With industrial drive lane.
xii. With slotted and traveling hook on first extension boom, xiii. Front tyres 12x24-20 PR (4 in numbers) and rear tyres 14x25-24 PR (2 in
numbers), xiv. Heavy counter-weight at rear and side, preferably on Rear Body, to establish
20 ton load carrying capacity, xv. Wheel base is increased to stabilize the crane, xvi. High load capacity Luff cylinders, xvii. High load capacity extension cylinders, xviii. High torque capacity propeller shaft(s). xix. Modified cabin, xx. Control valve and joy stick, xxi. Fuel tank and hydraulic tank, on Rear Body, xxii. Bonnet and modified radiator cum coolant mtg, on Rear Body. The concept involved in the designing and manufacture of the proposed PnC crane facilitates several precise advantages, such as: i. Compact boom and auxiliary boom with extension cylinder, ii. Suspended rear axle resulting excellent rough terrabilility and operator comfort.
Better crane stability.
Operator cabin in front side resulting excellent front visibility and overall stability of crane. Better serviceability.
Low height machine and compact machine can be used in city, malls, etc. AGB with synchromesh Mesh transmission. Less spare parts cost.
Equal tyres leads to easy spares and tyres rotation while wear. Robust high torque propeller shaft. Sturdy cylinder for Luffing operation. Weight lifting capacity Vs dead weight = 20/15 = 1.33 other advantages of new design proposed crane are:
Load carrying capacity has been increased from 16MT to 20MT.
Stability of machine has been improved.
Rear view has been improved due to flat deck and less obstacle from front
body column.
Easy access of fuel filling tank and its fuel level eye.
Easy access of battery and cutoff switch.
High speed and high torque propeller shaft.
Joy stick and control valve provides clean cabin and easy access to control
valve.
Robust boom and replacement of extension cylinder easy without
disturbing the system while maintenance.
Negative angle of boom so easy access to load and hook block.
Hook block has been standardized.
Improved design of aesthetic in counterweight.
Front light and its box have been improved.
• There has been improvement of gear shifting accelerator, stop cable attachment and clutch mounting inside cabin.
• Improvement inside cabin with aesthetic dashboard.
Optional Feature of the proposed crane:
The present invention provides an optional provision to produce /manufacture advanced pick and carry crane with twenty ton load carrying capacity for any type of road transport system, by rearranging and redesigning the necessary components of the proposed. Actually traffic directionality refers to regulations requiring all vehicular traffic to keep either to the left or the right side of the road, whether the right or left (relative direction) is specified depends on the laws of each country. This is so fundamental to vehicular transport that it is commonly referred to as the rule of the road. The purpose of the rule is to facilitate traffic flow and reduce the likelihood of head-on collisions. About 34% of the world, by population drives on the left and 66% on right. By roadway distances, about 28% drive on the left and 72% on the right, even though originally most traffic drove on the left worldwide.
Although the invention has been described with reference to specific
embodiments, this description is not meant to be construed in a limiting sense. Various modifications of the disclosed embodiments, as well as alternate embodiments of the invention, will become apparent to persons skilled in the art upon reference to the description of the invention. It is therefore contemplated that such modifications can be made without departing from the spirit or scope of the present invention as defined.

We claim:
1. A twenty 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 its load lifting and carrying capacity upto 20 tons, 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 ton pick and carry crane with optimized articulation, as claimed in claim 1, wherein the Rear Body mainly comprises of the Main Frame Rare with positions and arrangements thereof for mounting of various devices towards creation of the said Rear Body, the engine assembly with radiator effectively configured with the drive shaft, 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, rear articulation body hinge, 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 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, comprises of the suitable configuration of the engine assembly with the drive shaft through the gear box, wherein the drive shaft comprises of the gear box and differential axle suitably interfaced by the auxiliary gear box (AGB) using high torque propeller shaft.
4. A twenty ton pick and carry crane with optimized articulation, as claimed in claim 1, wherein the rear axle of the Rear Body of the proposed crane is a suspension type drive axel, duly incorporating the differential gear box.
5. A twenty ton pick and carry crane with optimized articulation, as claimed in claim 1, wherein the Front Body mainly comprises of the Front Body Frame with positions and arrangements thereof for mounting of various devices towards creation
of the said Front Body, front axle mounted with front wheels, the front side bumper, the Luff cylinder(s), compact boom assembly, front body articulation pivot plate and front articulation body hinge.
6. A twenty ton pick and carry crane with optimized articulation, as claimed in claim 1, wherein the articulation mechanism involves the articulation axis tilt towards the Rear Body by a small angle, preferably by 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 ton pick and carry crane with optimized articulation, as claimed in claim 1, wherein the driver's/operator's cabin mainly consists of a front glass curved to enable visibility at the top, a hood guard partially covering the front glass at its upper region, a wide back-window, sliding glass at the door, side triangular glass, foot step at lower height, door handle preferably with locking arrangement and the clutch bracket with better positioning; wherein the said cabin is mounted on the Front Body and is positioned adjacent to the compact boom assembly 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.
8. A twenty ton pick and carry crane with optimized articulation, as claimed in claim 1, wherein the compact boom assembly, mainly comprising of the mother boom, the extension cylinders, the hydraulic mechanism for regulation of extension cylinders, the rope regulation mechanism including winch, the jib head, the snatch block & load carrying hook, is installed on the Front Body of the proposed crane, wherein the said compact boom assembly is positioned adjacent to the driver's/operator's cabin in such a way that the total travel order height of the crane is low, and wherein the said compact boom assembly is characterized by its low height
towards low travel order height and easy serviceability and by involvement of U-pressing concept in the manufacture of mother boom as well as the extension cylinders/booms.
9. A twenty 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 ton pick and carry crane with optimized articulation, substantially as herein described and illustrated in the figures of the accompanying drawings.