Fully powered Fourth Part Boom Assembly With Synchronized Boom Extension-Retraction and Rope Compensation Mechanism
Field of the invention:
The present invention is generally related to a four part boom to be used in a crane, particularly in a pick and carry crane, wherein said four part boom assembly is provisioned with automatic boom extension-retraction mechanism synchronized with simultaneous rope compensation thereof.
Said four part boom assembly comprises of a main boom (that is, mother boom), disposed with three boom extensions, namely 1st boom extension, 2nd boom extension and 3rd boom extension; wherein said boom assembly comprises following novel and characteristic constructional as well as functional features:
(i) 3rd boom extension is not a manual extension and is so assembled with the 2nd boom extension that it gets automatically extended and retracted in proposed boom assembly, preferably with the 2nd boom extension therein;
(ii) 3rd boom extension is so assembled in the complete boom assembly that the rope compensation function is also automatically performed alongwith the boom extension or retraction operation;
(iii) The construction and assembly of various components of the proposed four part boom assembly, including the boom extension mechanism through hydraulic cylinder and unique rope routing arrangements thereof as well as the load handling rope-arrangement thereof, is so novel that the operator of the crane easily conducts boom extension or retraction operation, synchronized with the simultaneous rope compensation function of the load handling rope-arrangement of the said boom assembly, particularly through single lever operation;
(iv) The proposed four part boom assembly comprises a novel rope mechanism for extension & retraction of 3rd boom extension.
Background and Object of the invention:
Usually three part boom assembly with synchronized boom extension/retraction and rope compensation mechanism is known for using in a crane, particularly in pick and carry cranes. In a conventional four part boom assembly, the fourth part (third boom extension) is a manual component which is manually mounted at the distal end of the second boom extension and the jib head is mounted at the distal end of said fourth part boom. Thus the load holding rope, assembled with the jib head, passed through the fourth part boom, which is basically the integrated third boom extension therein.
Therefore the instant invention proposes a four part boom assembly to be used in a crane, particularly for pick and carry cranes, wherein the third boom extension is so assembled with the second boom extension that it is not manually mounted on to the second boom extension and it is characterized in its automatic extension and retraction in the complete boom assembly with the help of unique anchoring and routing of the rope-arrangement, and wherein its extension/retraction is well synchronized with the automatic rope compensation associated therein.
Description of the invention with the help of accompanying drawings:
The basic invention and the general field of the invention is described and illustrated herein below with two schematic drawings/scheme(s) associated with the construction and automatic synchronized functioning of the proposed four part boom assembly.
Basic structural features of the most preferred embodiment of the proposed invention namely ‘Fully powered Fourth Part Boom Assembly With Synchronized Boom Extension-Retraction and Rope Compensation Mechanism’ are depicted and illustrated in schematic drawings, wherein said four part boom assembly is provisioned with automatic boom extension-retraction mechanism synchronized with simultaneous rope compensation thereof.
Figure 1 represents a schematic view of a four part boom assembly comprises of mother boom (1) with its one end consist of a winch (6), first boom extension (2) , second boom extension (3) and third boom extension (4) in retracted condition, the jib-head (5) and load holding rope arrangement/ winch rope(7).
Figure 2 represents a schematic view of a four part boom assembly comprises of mother boom (1) with its one end consist of a winch(6), first boom extension (2) , second boom extension (3) and third boom extension (4) in extended condition and load holding rope arrangement(7)
Figure 3(a) represents first view of the Retracted Boom Assembly.
Figure 3(b) represents second view of the Retracted Boom Assembly.
Figure 4 shows schematic view of Extended Boom Assembly showing the mother boom (1) and all three boom extensions (2), (3) and (4) automatically extended using its novel rope arrangements (7).
Figure 5 represents schematic exploded view of the mother boom (1), first boom extension (2), second boom extension (3) and third boom extension in extended condition(5) of the proposed 4-part boom assembly.
Figure 6 shows schematic representation of the mother boom (1) of the proposed 4-part boom assembly showing its major constructional features.
Figure 7 shows schematic representation of the first boom extension (2) of the proposed 4-part boom assembly showing its major structural and constructional features which comprises of main body (10) with box size of 410x459 (width x height) in mm; wherein at the distal end of the said first boom extension (2) is provisioned with a Pulley (8) to guide Winch rope (7), an arrangement of pulley (12) and bracket (9) for maintaining the forward/backward movement of third extension (4), a half pulley and slot (11) to pass the retraction rope, and a rope anchoring block (13) to anchor the retraction/extension rope, particularly to support automatic rope based extension and retraction of all the boom extensions.
Figure 8 views schematic representation of the 2nd boom extension of the proposed 4-part boom assembly showing its major structural and constructional features made to support automatic rope based extension and retraction of all the boom extensions comprises the main body (16) of the box size 314x389 (width x height) in mm, having at its proximal end the arrangement of Bearing & Pin (14) for guiding retraction rope, Rear pulleys (15) for effective movement of third extension (4), and at its distal end arrangement of Bracket (17) to hold multiple pulleys (18), (19) and (20), constructed and mounted in a particular manner to pass the extension rope through them and for effective forward/backward movement of third extension (4).
Figure 9 views schematic representation of the third boom extension of the proposed 4-part boom assembly showing its major structural and constructional features made to support automatic rope based extension and retraction of all the boom extensions, comprises of its main body (16) with the box size of 198x323 (width x height) in mm, having at its proximal end the jib-head (5) with the arrangement a Pulley & bracket (21) for winch rope, and at the proximity of its distal end having the arrangement of flat pulley (23) for rope compensation and at its distal end a guide bracket (24) designed on both side for extension/retraction rope towards maintaining the forward/backward movement of said 3rd Boom Extension; and wherein said structural and constructional features of 3rd Boom Extension (4) is so provisioned to support automatic rope based extension and retraction of all the boom extensions.
Figure 10 views schematic representation of the automatic rope compensation mechanism involved with the proposed 4-part boom assembly the automatic rope compensation mechanism involved with the proposed 4-part boom assembly is secured by routing of the rope (7) from winch (6) to the snatch block (25) via all major boom components namely, mother boom(1) consisting a winch(6) and a winch rope (7) ; first boom extension(2) consisting Pulley at its one end (8); second boom extension (3) consisting a rope compensation pulley (26) at its one end and a pulley arrangement at another end (19); and third boom extension (4) consisting a rope compensation pulley (23) at its one end and a snatch block (25) at other end.
The automatic extension and retraction of the 3rd Boom Extension (4) is realized by the Synchronized Boom Extension-Retraction and Rope Compensation Mechanism, particularly by routing of the rope (7) from winch (6) to the pulley arrangement (8) at the distal end of the 1st Boom Extension (1), through to the rope compensation pulley arrangement (26) at the proximal end of the 2nd Boom Extension (3), further through the pulley arrangement (19) at the distal end of said 2nd Boom Extension (3), and further through the rope compensation pulley arrangement (23) at the proximal end of the 3rd Boom Extension (4) and finally to snatch block (25), secured at the jib head (5) at the distal end of the said 3rd Boom Extension (4).
Figure 11 views schematic representation of the proposed 4-Part boom assembly wherein those constructional and functional features of third boom extension are mainly highlighted which are responsible for its automatic extension and retraction showing first extension (35), second extension (27), third extension (28), retraction rope (29), guide bracket on both side (30) , extension rope (31), rear pulley on both sides (32), retraction rope anchor on first extension (33) and extension rope anchor in first extension (34).
In Figures, various structural features of the said four part boom assembly are labeled with certain numerals.
The mother Boom (1): This is the main and first boom Component, which is pivotally mounted onto Luff cylinders and within which all three boom extensions are provisioned to be disposed. Further on one end (6) of the mother boom (1), there is provision of mounting the rope winding winch.
First Boom Extension (2): It is the second boom component, which is provisioned to be extended from and retracted within the mother boom (1) through a hydraulic cylinder.
Second Boom Extension (3): It is the third boom component, which is provisioned to be extended from and retracted within the First Boom Extension (2), wherein such extension/retraction is performed with the help of rope arrangements synchronized with the hydraulic cylinder attached with the First Boom Extension (2).
Third Boom Extension (4): It is the fourth boom component, which is provisioned to be extended from and retracted within the Second Boom Extension (3), wherein such extension/retraction is performed with the help of rope arrangements synchronized with the hydraulic cylinder attached with the First Boom Extension (2). This fourth boom component (4) specifically is the subject matter invention herein and it is characterized in its automatic function towards extension and retraction, mainly with the help of novel rope arrangements therein, duly synchronized with the hydraulic cylinder attached with the First Boom Extension (2) and the Rope arrangements associated with Second Boom Extension (3).
The instant invention is further characterized in the rope compensation mechanism, wherein the load holding rope arrangement (7) is routed through the proposed automatically functional Third Boom Extension (4) and wherein said load holding rope arrangement (7) duly gets compensated automatically while the Boom assembly is extended or retracted by the crane operator.
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.

CLAIMS:
We Claim:
1. A four part boom assembly to be used in a crane, particularly in a pick and carry crane, wherein said four part boom assembly comprises of mother boom (1), 1st Boom Extension (2), 2nd Boom Extension (3), 3rd Boom Extension (4) and the ‘Synchronized boom Extension-Retraction and Rope Compensation Mechanism’, wherein said four part boom assembly is characterized in automatic extension and retraction of 3rd Boom Extension (4) (that is 4th part) in the said complete boom assembly with the help of provisioned anchoring and routing of the rope-arrangement for the purpose, and wherein the extension/retraction of said 3rd Boom Extension (4) is well synchronized with the automatic rope compensation associated therein.
2. A four part boom assembly, as claimed in claim 1, wherein the third boom extension is so assembled with the second boom extension that it is not manually mounted on to the second boom extension and it is characterized in its automatic extension and retraction in the complete boom assembly with the help of unique anchoring and routing of the rope-arrangement, and wherein its extension/retraction is well synchronized with the automatic rope compensation associated therein.
3. A four part boom assembly, as claimed in claim 1, wherein the first boom extension (2) of one preferred embodiment of the said four part boom assembly comprises of main body (10) with box size of 410x459 (width x height) in mm; wherein at the distal end of the said first boom extension (2) is provisioned with a Pulley (8) to guide Winch rope (7), an arrangement of pulley (12) and bracket (9) for maintaining the forward/backward movement of third extension (4), a half pulley and slot (11) to pass the retraction rope, and a rope anchoring block (13) to anchor the retraction/extension rope, particularly to support automatic rope based extension and retraction of all the boom extensions.
4. A four part boom assembly, as claimed in claim 1, wherein the second boom extension (3) of one preferred embodiment of the said four part boom assembly comprises the main body (16) of the box size 314x389 (width x height) in mm, having at its proximal end the arrangement of Bearing & Pin (14) for guiding retraction rope, Rear pulleys (15) for effective movement of third extension (4), and at its distal end arrangement of Bracket (17) to hold multiple pulleys (18), (19) and (20), constructed and mounted in a particular manner to pass the extension rope through them and for effective forward/backward movement of third extension (4); and wherein structural and constructional features of 2nd Boom Extension (3) is so provisioned to support automatic rope based extension and retraction of all the boom extensions therein.
5. A four part boom assembly, as claimed in claim 1, wherein the third boom extension (4) of one preferred embodiment of the said four part boom assembly comprises of its main body (16) with the box size of 198x323 (width x height) in mm, having at its proximal end the jib-head (5) with the arrangement a Pulley & bracket (21) for winch rope, and at the proximity of its distal end having the arrangement of flat pulley (23) for rope compensation and at its distal end a guide bracket (24) designed on both side for extension/retraction rope towards maintaining the forward/backward movement of said 3rd Boom Extension; and wherein said structural and constructional features of 3rd Boom Extension (4) is so provisioned to support automatic rope based extension and retraction of all the boom extensions.
6. A four part boom assembly, as claimed in claim 1, wherein the automatic rope compensation mechanism involved with the proposed 4-part boom assembly is secured by routing of the rope (7) from winch (6) to the snatch block (25) via all major boom components namely, mother boom(1) consisting a winch(6) and a winch rope (7) ; first boom extension(2) consisting Pulley at its one end (8); second boom extension (3) consisting a rope compensation pulley (26) at its one end and a pulley arrangement at another end (19); and third boom extension (4) consisting a rope compensation pulley (23) at its one end and a snatch block (25) at other end.
7. A four part boom assembly, as claimed in claim 1, wherein the automatic extension and retraction of the 3rd Boom Extension (4) is realized by the Synchronized Boom Extension-Retraction and Rope Compensation Mechanism, particularly by routing of the rope (7) from winch (6) to the pulley arrangement (8) at the distal end of the 1st Boom Extension (1), through to the rope compensation pulley arrangement (26) at the proximal end of the 2nd Boom Extension (3), further through the pulley arrangement (19) at the distal end of said 2nd Boom Extension (3), and further through the rope compensation pulley arrangement (23) at the proximal end of the 3rd Boom Extension (4) and finally to snatch block (25), secured at the jib head (5) at the distal end of the said 3rd Boom Extension (4).