Title of Invention	"A BOOM FOR USE WITH A CRANE"
Abstract	An improved boom for use with a crane comprising a mother boom having first and second extensions disposed therein a manual extension member being provided with the last hydraulic operating extension member of the main jib of a crane, Characterised by a push rod having its distal end secured to said manual extension member and the proximal end to said hydraulic operated extended member being provided to stop the retracting/backward movement of said manual extension so as to adjust the height of the boom.

Title of Invention

"A BOOM FOR USE WITH A CRANE"

Abstract

An improved boom for use with a crane comprising a mother boom having first and second extensions disposed therein a manual extension member being provided with the last hydraulic operating extension member of the main jib of a crane, Characterised by a push rod having its distal end secured to said manual extension member and the proximal end to said hydraulic operated extended member being provided to stop the retracting/backward movement of said manual extension so as to adjust the height of the boom.

Full Text	This invention relates to an imployed boom for use with a crane. In particular, this invention relates to a power pinned manual extension member of said boom. Cranes presently known in the art have normally a boom of fixed length. Due to such a fixed length of the boom, hooks are provided at different lengths of the boom depending upon the weight of the load to be lifted by the crane. Such hooks are held to the boom through hook plates rigid1y he1d to the boom at said different lengths. The disadvantage associated with such a known construction is that the boom is of a fixed length and some time it. is difficult to lift a particular weight. An object of this invention is to propose an improved construction of a boom for use with a crane, Another object of this invention is to propose a boom having a power pinned manual extension member„ Still another object of this invention is to propose a boom of an adjustable length which is efficien t.,, According to this invention there is provided an improved boom for use with a crane comprising a mother boom having first and second extensions disposed therein a manual extension member being provided with the last hydraulic operating extension member of the main jib of a crane, characterised by a push rod having its distal end secured to said manual extension member and the proximal end to said hydraulic operated extended member being provided to stop the retracting/backward movement of said manual extension so as to adjust the height of the boom. Specifically in according with this invention a manually operated extension member is provided with the first hydraulic operating extension member and is locked by means of a locking pin provided with said hydraulic operated extension member. In operation, the hydraulic operated member is extended outwardly. A locking pin is provided in a hole provided at the distal end of the hydraulic operated extension member and is adapted to be removed so as to lock the manually operated extension member with the hydraulic extension member. The boom further comprises a push rod secured to the distal end to the manually operated extension member and at the proximal end to the hvdraulic operated extension member. The push rod has a plurality of spaced holes for accommodating the locking pin in any one of said holes,, When the hydraulic operated extension member is retracted within the main lib or boom,, the pin strickes the boom and allows the manual extension member to be remained outwardly,, The snatch block is secured to the distal end of the manual extension member. A boom for use with a crane according to a preferred embodiment is herein described and illustrated in the e acompanying drawinqs wherein ;... Fig,, 1 shows the boom in retractecl/unextended position; Fiq,, 2 shows the boom having first and second extensions in extended position ; Fiq,, 3 shows the boom having manual extension in the extended positionsand Fiq. 4 shows the boom havinq manual extension in extended position but first extension in the u n e x p e n d e d / r e t r a c ted p o s i t ion Referring to t h e drawinqs particular1y fig • 1 the boom comprises a mother boom B secured with the frame of the crane. A first extension X1 is disposed within the mother boom B such that to be extended outwardlv bv the hydraulic means provided for expending and retracting/unexpending the booms „ A sencond extension is disposed within the first extension such that to be extended outwardly by the hydraulic means. These features are as such known in the art and do not constitute inventive features „ Specifically, according to this invention a power pinnecl manual extension and is provided with the second extension X2 such that to be extended by means of the hydraulic means in the same way as herein described above. For' this purpose a push rod R is secured with the front/distal end of the manual extension M with the help of nut and bolts M B and the rear end of the rod is secured with the proximal/rear end of the hyciraulical 1 y operated 2nd extension. A pin P is provided at the distal end of the first extension XI such that to be replaced as and when required to fit in the holes HI, H2,, H3 etc. provided in the push rod R for stopping the retracting movement of the manua1 extension M during the retracting/backward movement of the first and second extension XI. and X2. Thus during the operation of the crane first and second extension XI and X2 are extended outwardly with the help of the hydraulic means provided with the crane. The manual extension is extended outwardly; from the second extension manually and the power pin P is removed from the first extension and is placed in any one of the holes H1, H2, H3 etc,, of the push rod as per the requirements now the first and second extensions are retracted to fix the height of the crane and retracting movement of the manual extension is stopped as the power pin P butted/strickes aqainst the distal end of the respective ex tenstion and thus remain out, even if the respective extension is retracted completely„ We claim: 1. An improved boom for use with a crane comprising a mother boom having first and second extensions disposed therein a manual extension member being provided with the last hydraulic operating extension member of the main jib of a crane, Characterised by a push rod having its distal end secured to said manual extension member and the proximal end to said hydraulic operated extended member being provided to stop the retracting/backward movement of said manual extension so as to adjust the height of the boom. 2. An improved boom as claimed in claim 1 wherein the push rod is provided with a plurality of holes to receive a pin provided at the distal end of the first extension of the boom. 3. An improved boom for use with a crane substantially as herein described and illustrated.

Full Text

This invention relates to an imployed boom for use with a crane. In particular, this invention relates to a power pinned manual extension member of said boom.
Cranes presently known in the art have normally a boom of fixed length. Due to such a fixed
length of the boom, hooks are provided at different lengths of the boom depending upon the weight of the
load to be lifted by the crane. Such hooks are held to the boom through hook plates rigid1y he1d to the boom
at said different lengths.
The disadvantage associated with such a known construction is that the boom is of a fixed length and some time it. is difficult to lift a particular weight.
An object of this invention is to propose an improved construction of a boom for use with a crane,
Another object of this invention is to propose a boom having a power pinned manual extension member„
Still another object of this invention is to propose a boom of an adjustable length which is efficien t.,,
According to this invention there is provided an improved boom for use with a crane comprising a mother boom having first and second extensions disposed therein a manual extension member being provided with the last hydraulic operating extension member of the main jib of a crane, characterised by a push rod having its distal end secured to said manual extension member and the proximal end to said hydraulic operated extended member being provided to stop the retracting/backward movement of said manual extension so as to adjust the height of the boom.
Specifically in according with this invention a manually operated extension member is provided with the first hydraulic operating extension member and is locked by means of a locking pin provided with said hydraulic operated extension member. In operation, the hydraulic operated member is extended outwardly. A locking pin is provided in a hole provided at the distal end of the hydraulic operated extension member and is adapted to be removed so as to lock the manually operated extension member with the hydraulic extension member. The boom further comprises
a push rod secured to the distal end to the manually
operated extension member and at the proximal end to the hvdraulic operated extension member. The push rod
has a plurality of spaced holes for accommodating the locking pin in any one of said holes,, When the
hydraulic operated extension member is retracted within the main lib or boom,, the pin strickes the boom and
allows the manual extension member to be remained outwardly,, The snatch block is secured to the distal
end of the manual extension member.
A boom for use with a crane according to a preferred embodiment is herein described and illustrated
in the e acompanying drawinqs wherein ;...
Fig,, 1 shows the boom in retractecl/unextended position;
Fiq,, 2 shows the boom having first and second extensions in extended position ;
Fiq,, 3 shows the boom having manual extension in the extended positionsand
Fiq. 4 shows the boom havinq manual extension in extended position but first extension in the u n e x p e n d e d / r e t r a c ted p o s i t ion
Referring to t h e drawinqs particular1y fig •
1 the boom comprises a mother boom B secured with the frame of the crane. A first extension X1 is disposed
within the mother boom B such that to be extended outwardlv bv the hydraulic means provided for expending
and retracting/unexpending the booms „ A sencond extension is disposed within the first extension such
that to be extended outwardly by the hydraulic means. These features are as such known in the art and do not
constitute inventive features „
Specifically, according to this invention a
power pinnecl manual extension and is provided with the second extension X2 such that to be extended by means of
the hydraulic means in the same way as herein described above. For' this purpose a push rod R is secured with
the front/distal end of the manual extension M with the help of nut and bolts M B and the rear end of the rod
is secured with the proximal/rear end of the hyciraulical 1 y operated 2nd extension. A pin P is
provided at the distal end of the first extension XI such that to be replaced as and when required to fit in

the holes HI, H2,, H3 etc. provided in the push rod R
for stopping the retracting movement of the manua1 extension M during the retracting/backward movement of
the first and second extension XI. and X2.
Thus during the operation of the crane first
and second extension XI and X2 are extended outwardly with the help of the hydraulic means provided with the
crane. The manual extension is extended outwardly; from the second extension manually and the power pin P is
removed from the first extension and is placed in any one of the holes H1, H2, H3 etc,, of the push rod as per
the requirements now the first and second extensions are retracted to fix the height of the crane and
retracting movement of the manual extension is stopped as the power pin P butted/strickes aqainst the distal
end of the respective ex tenstion and thus remain out, even if the respective extension is retracted
completely„

We claim:
1. An improved boom for use with a crane comprising a mother boom
having first and second extensions disposed therein a manual
extension member being provided with the last hydraulic operating
extension member of the main jib of a crane, Characterised by a push
rod having its distal end secured to said manual extension member
and the proximal end to said hydraulic operated extended member
being provided to stop the retracting/backward movement of said
manual extension so as to adjust the height of the boom.
2. An improved boom as claimed in claim 1 wherein the push rod is
provided with a plurality of holes to receive a pin provided at the distal
end of the first extension of the boom.
3. An improved boom for use with a crane substantially as herein described and illustrated.

Documents:

2306-del-1997-abstract.pdf

2306-del-1997-claims.pdf

2306-del-1997-correspondence-others.pdf

2306-del-1997-correspondence-po.pdf

2306-del-1997-description (complete).pdf

2306-del-1997-drawings.pdf

2306-del-1997-form-1.pdf

2306-del-1997-form-19.pdf

2306-del-1997-form-2.pdf

2306-del-1997-form-3.pdf

2306-del-1997-gpa.pdf

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Patent Number

220120

Indian Patent Application Number

2306/DEL/1997

PG Journal Number

29/2008

Publication Date

18-Jul-2008

Grant Date

15-May-2008

Date of Filing

14-Aug-1997

Name of Patentee

R.S.JOON

Applicant Address

ESCORTS CONSTRUCTION EQUIPMENT LIMITED,PLOT NO.2,SECTOR,13 FARIDABAD-121 007,INDIA

Inventors:

#	Inventor's Name	Inventor's Address
1	R.S.JOON

PCT International Classification Number

B66C 23/26

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA