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OBJECTS OF THE INVENTION
It is therefore, an object of the present invention to propose a pneumatic locking device of dallah flap in dumper which eliminates the adversity of the prior art.
Another object of the present Invention is to propose a pneumatic locking device of dallah flap in dumper which is easy to handle.
A further object of the present Invention is to propose a pneumatic locking device of dallah flap in dumper which is safe way to eliminate spillage from dumper.
A still further object of the present invention is to propose a pneumatic locking device of dallah flap in dumper which resists the polluslon and accident on road.
An yet further object of the present Invention Is to propose a pneumatic locking device of dallah flap in dumper which can be handled by the driver of the dumper.

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SUMMARY OF THE INVENTION
Pneumatic flap locking device comprising of a combination of pneumatic system and a mechanical means. In first phase, a pneumatic pipe line is drawn from a air tank already installed in the dumper to a control for opening and closing operation, valve disposed near the driver seat via a pressure regulator valve.
From the control valve, two pneumatic air lines are drawn and connected to a pneumatic cylinder which is fixed in position under carrier body. The control valve operate the pneumatic cylinder by means of pneumatic air pressure.
The piston rod head of pneumatic cylinder is attached to a hinge of first end of a connecting member and the second end of the connecting member is attached with the central shaft disposed under the carrier body. The opening and closing of pneumatic cylinder piston rotates the central shaft in clockwise and anti-clockwise direction. In the second phase, both ends of the central shaft is connected to a first end of a connecting member which is parral to first connecting member of the central shaft. So when central shaft rotates, the second connecting member on both sides also rotate. The second end of the second connecting members at both sides are

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hinged to first end of a turn backle tie-rod at and both sides and the second end of the turn tie-rod at both sides are hinged with first end of a pull rod at both sides and the second end of pull rods are at both sides are connected to a oblique hockey stick shaped member for hooking. First end of oblique hockey stick shaped member at both sides are hinged is a side wall of the dumper and second end of the latch provided with a groove which in turn passes over an extended pin of flap door for locking.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING.
Flg-1 shows a schematic diagram of pneumatic flap locking system In a dumper.
Fig-2 shows a schematic diagram flap locking system in closing condition on one side of fig-1.
Fig-3 shows a schematic diagram flap locking system in opening condition of one side of fig-i.

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DETAILS DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
As shown In fig 1,the present Invention help a driven of the dumper to
open or close the dallah flap door of the dumper by operating a hand lever
(1). For opening, the hand lever (1) of control valve (4) have to rotate
anti-clockwise direction (3) (2) and for closing the hand lever (1) have to
rotate in clockwise direction (2). The hand lever (1) is connected to a
control valve (4) which controls the pneumatic air, the inlet pneumatic air
of the control valve is supplied from a air tank (5) via a on line pressure
regulator (6) and two outlet pneumatic air pipe (7,8) of the control valve
(4) are connected to a two point of a pneumatic cylinder (9). The opening
and losing of the pneumatic cylinder (9) are regulated by the control valve
(1). The piston rod head (10) of the pneumatic cylinder (9) is hinged with
a first end of a central connecting member (11) (fig-2,3) and the second
end of a central connecting member (11) is rightly fixed with central shaft
(12) which supported by a plurality of bearings (13, 14, 15, 16) fastened
with body structure of the dumper and disposed under carrier body (26).
Two identical connecting members (17,17) parallel to central connecting
member, (11) are also fastened at both end (18,19) of the central shaft
(12). The second end of the second connecting member, (17,17) are
hinged with a turn buckle tie-rods (20,20) at both sides. The second end of
the turn buckle (20,20) are hinged with a pull rod (21) which in turn rightly

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fixed with a oblique hockey stick shaped member (22). One end (32) of oblique hockey stick shaped member (22) is hinged with side wall of dumper and he second end of the oblique hockey stick shaped member provided with a groove which passes over an extended pln (24) of flap door and locked the flap door (25). For locking the flap door, the driven rotates the hand lever (1) of control valve (4) clockwise (2) which allows the pneumatic air to pass to the cylinder (9) through air pipes (7,8). The pneumatic air pushes the cylinder piston forward and piston rod head pushes the connecting member (11) in forward direction which in turn rotates central shaft (12) clockwise, and second connecting member (17,17) on both sides also rotates clockwise direction and pushes the turn buckle tie-rod (20) In forward direction which in turn pushes the oblique hockey stick shaped member (22) to place the groove (23) on the hinge pin (24) of flap (24) for hooking and locked (fig-2).
For opening the flap door, the driver rotates the hand lever (1) of control valve (4) in anti-clockwise (3) which release the air pressure and allows the pneumatic cylinder to push backward direction which In turn allows to rotate the central shaft (12) in anti-clockwise direction via a connecting member (11). The side connecting members (17,17) on both sides also rotates anti-clockwise direction along with shaft (12) which in turn pull the turn buckle (20) on both sides and allows the oblique hockey stick shaped

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member groove (23) to come out from the extended pln (24) of the flap door (25) (fig-3).

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WE CLAIM
1. A pneumatic locking device of dallah flap in dumper comprising
- a hand lever (1) of the control valve (4) rotateable clockwise (2)
or anti-clockwise (3) for opening and closing of dallah flap (2);
- a pneumatic cylinder (9) rightly fixed with the carrier body (26),
controllable and operateable by the control valve (1) and the
piston head Is hinged with a connecting member (11) which in
turn connected with a central shaft (12) by the other end and
the push or pull movement of the piston of pneumatic cylinder
rotates the central shaft (12) clockwise or anti-clockwise via a
connecting member (11);
- a central shaft (12) supported by a plurality of bearings (13, 14,
15, 16) rightly fixed with the carrier body (26), the central part
of shaft (12) is connected to a connecting member (11) and
both end (18,19) of shaft (12) are connected with a second
connecting member (17,17);
- two connecting member (17,17) at attached to shaft (12) are
disposed at both side of the dumper, one end of each

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connecting member (17) is connected with a central shaft (12) and the second end of each connecting member is hinged with a turn buckle tie rod (20);
- a turn buckle tie-rod (20), one end is hinged with a connecting
member (17) and the second end is hinged with a pull rod (21);
- a pull rod (21), one end is connected with turn buckle tie-rod
(20) and second end is connected with a oblique hockey shaped
member (22);
- a oblique hockey shaped member (22), one end (23) Is hinged
with side wall of dallah and the second end provided with a
groove (23) with rests on a extended pin (24) of flap (25) for
locking;
- a extended pin (24) of the flap (25) on which the groove (23)
portion of a oblique hockey Shaped member (22) rest for
locking;
- a air tank (25) for catering air through a pressure regulator (6)
to the control valve (4) by means of air pipe line and from

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control valve (4) to pneumatic cylinder (9) by means of air pipe line (7,8)
2. A process of operating the locking device comprising following steps
- operating the hand lever (1) clockwise (2) or anti-clockwise (3),
of the control valve (4) which allows the pneumatic cylinder (9)
through pipe line (7, 8) and operates one piston of the cylinder
(9);
- operating the piston of the cylinder (9) to push the first
connecting member (11) in forward direction which rotates the
central shaft (12) clockwise which in turn further rotate the
second connecting member (17) in clockwise direction, which
pushes the turn buckle tie-bar in forward direction to place the
groove (23) of oblique hockey stick shaped member (22) over
the pin (24) for locking the flap (25).
3. A pneumatic locking device of dallah flap In dumper as substantially
described and illustrated herein with reference to accompanying
drawings.
4. A process of operating locking device as substantially described and
illustrated herein with reference to accompanying drawings.
Dated this 8th day of DECEMBER 206.