FIELD OF INVENTION
The present invention relates to an adjustable span lifting bridge for lifting heavy
equipment with single and double crane hook.
BACKGROUND OF THE INVENTION
Lifting bridge is an equipment used for lifting heavy equipment. The use of lifting
bridge for an equipment is limited by the span of lifting points in the equipment. For a
given weight capacity a new bridge has to be made depending upon the distance
between the lifting points in the equipment. The lifting bridge design is also governed
by the type of crane hook to be used for lifting the bridge. Cranes with single J hook
require a different design of lifting bridge than a crane with double J hook. To
overcome this issue an innovative lifting bridge with adjustable span and capable of
being lifted with single or double J crane hook was designed.
OBJECTS OF THE INVENTION
Therefore, it is an object of the invention to propose an adjustable span lifting
bridge for lifting heavy equipment with single and double crane hook, which is capable
of lifting any weight capacity by adjusting the distance lifting points without being
governed by the type of crane hook, single or double.

SUMMARY OF THE INVENTION
The arrangement is a fabricated structure made from mild steel plates welded
together. The main load carrying beam a box type beam made from an I-beam and
support plates welded to it on its sides. The support plates are welded inside the I-
beam flush with the corner so as to form a box cum I-beam. Before welding the
support plates the main beam assembly is further stiffened by stiffening ribs welded at
suitable intervals.
A slotted plate is welded on to the top of the main beam assembly. The slotted
plate has milled slots which are used in adjusting the span of the lifting bridge. Lifting
plate assembly with connecting plates is welded to the main beam assembly. The lifting
plate assembly is suitably stiffened with interconnecting stiffeners. The lifting plate
assembly, transmits the load from the lifting bollards to the main beam assembly. The
lifting plate assembly has provision for insertion of three bollards. Locking plate
arrangement is given for locking the bollard. When lifting with single J hook of crane
the top bollard is used and bottom two are removed. When lifting with double J hook
the bottom two bollards are used and the top bollard is removed. The three bollards
provide the feature of lifting with single or double J crane hook.

Two numbers span adjusting lifting brackets provide the feature for adjusting the
span of the bridge. The span adjusting lifting brackets are made of box beam with an I
beam in it. The dimensions of the box I beam of the lifting bracket are so made that it
engages in the milled slots of the slotted plate welded to the main I beam assembly.
The lifting bracket has been so designed that it just slides onto the main beam
assembly. The box with I beam of the lifting bracket engages in the slots provided in
the slotted plate of the main beam assembly. The distance between the two lifting
brackets can adjusted as per the distance of lifting points in the equipment. This
provides the adjustable span feature of the lifting bridge. The arrangement helps in
lifting equipment with different spans of lifting positions there by eliminating the need
of number of lifting bridges.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Figure 1 shows a lifting bridge with span adjusting lifting brackets;
Figure 2 shows a box beam assembly with lifting bollards for single and double J
crane hook;
Figure 3 shows a span adjusting lifting bracket;
Figure 4 Shows front and side view of lifting bridge assembly.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE
INVENTION
Figure 1 indicates the isometric view of complete lifting bridge assembly (B) with
span adjusting lifting brackets. Figure 2 indicates the isometric view of box beam
assembly with slotted plate and lifting bollards. Figure 3 indicates the span adjusting
lifting bracket. Figure 4 indicates front and side view of lifting bridge assembly.
Item 1 is the box beam assembly with slotted plates (5) for adjusting the span
and three number lifting bollards (6, 7, 7) for lifting with single or double crane hook.
Item 2 is an I beam which runs along the entire length of item 1. Two number support
plates item 3 are welded inside the I-beam flush with the corner so as to form a box
cum I-beam. Before welding the support plates the main beam assembly is further
strengthened by stiffening ribs item 4 welded at suitable intervals.
A slotted plate item 5 is welded on to the top of the main beam assembly (1).
The slotted plate has milled slots which are used in adjusting the span of the lifting
bridge. Lifting plate assembly item 8 with connecting plates item 9 is welded to the
main beam assembly. The lifting plate assembly (8) is suitably stiffened with stiffening
plate item 17. The lifting plate assembly (8) transmits the load from the lifting bollards
(6, 7) to the main beam assembly. The lifting plate assembly (8) has provision for

insertion of three bollards. Item 6 is bollard for lifting with single hook of crane. Item 7
are two numbers lifting bollard for lifting with double crane hook.
Locking plate arrangement item 11 is given for locking the bollard (7). The
locking mechanism has swivel action and engages in the slot provided in the bollard to
lock it. When the bridge is to be used with lifting with single hook crane then only the
top bollard (6) is used. The remaining two bollards at the bottom are removed. When
the bridge is to be used with lifting with double hook crane then top bollard (6) is
removed and bottom two bollard (7) are used. This removable bollard feature makes it
useable for both single and double crane hook.
Figure 3 indicates the span adjusting lifting bracket (L). The bracket (L) is
fabricated by first making a box I beam assembly item 13. Two number support plates
item 12 are welded to the box beam item 13. Hook item 16 is welded to the support
plates item 12. A handle item 14 is provided to lift the span adjusting bracket (L). The
span adjusting bracket (L) is lifted by the handle (14) and inserted in the main beam
assembly. The box beam item 13 gets engaged in slotted plate item 05. To adjust the
span the span adjustment bracket (L) can be moved and engaged in any of the slots on
item 05. This provides the adjustable span feature to the lifting bridge (B). A stopper
arrangement item 15 is provided to prevent disengagement of span adjusting bracket
from main beam assembly.

The above arrangement provides adjustable span for lifting an equipment and
can be lifted by a single or double hook of crane.
Reference numerals
1 Box Beam 09 Connecting Plate
2 I-Beam 10 Support Plate
3 Support Plate 11 Locking Plate
4 Stiffing Ribs 12 Span Adjusting Lifting Bracket
5 Slotted Plate 13 Box with I-Beam
6 Lifting Bollard with Single hook 14 Handle
7 Lifting Bollard for lifting with 15 Stopper
double J Hook
8 Lifting Plate Assy. 16 Hook
17 Stiffening Plate

WE CLAIM
1. An adjustable span lifting bridge for lifting heavy equipment with both single and
double crane hook comprising;
a box beam assembly (1);
an I-Beam (2) running along the entire length of the box beam assembly;
a slotted plate (5) welded on the top of the beam assembly (1) for adjusting the
span for lifting;
a plurality of lifting bollards (6, 7, 7) for lifting a weight with single or double
crane hook;
a plurality of support plates (3) welded inside the I-beam (2) flushing with the
corner forming a box cum-I-beam;
a plurality of stiffening ribs (4) welded to the main box beam assembly (1) at
suitable intervals for strengthening the said beam assembly;
a lifting plate assembly (8) and a plurality of connecting plates (9) welded to the
main box beam assembly;
a stiffening plate (17) fixed to the lifting plate assembly for strengthening the
lifting plate assembly;
a locking plate arrangement (11) with swivel action configured for locking the
bollard;

a handle (14) for lifting span adjusting bracket (L);
a plurality of hook welded to the support plates (12);
characterized in that,
a span adjusting lifting bracket (1) is fabricated with box I beam assembly (13)
when two support plates (12) are welded to the box beam (13) and hook (16) is welded
to support plates (12) wherein a handle is configured for lifting the span adjusting
bracket and inserting the same in the milled slots of the slotted plate (05) as per
requirement providing adjustable span facility for lifting the bridge (B) wherein the
bollards (6, 7, 7) are disposed for lifting the weight when top bollard (6) is configured
for lifting with single hook of crane and bottom two bollards are configured for lifting
with double hook crane when a stopper arrangement (15) is disposed for preventing
disengagement of span adjusting bracket (L) from main beam assembly (1).
2. The adjustable span lifting bridge (B) as claimed in claim 1, wherein two
numbers of support plates (3) are disposed for welding inside the I-Beam.
3. The adjustable span lifting bridge (B) as claimed in claim 1, wherein the slotted
plate (5) has milled slots for adjusting the span of the lifting bridge (B).

4. The adjustable span lifting bridge (B) as claimed in claim 1, wherein bollard (6) is
used for lifting with single hook of crane when two numbers bollard (7) are sued for
lifting with double hook of crane.