FIELD OF INVENTION
The present invention relates to a mechanized tail gate arrangement in a tipper. More
particularly the invention relates to automatic opening without any human intervention
as the dallah or dump body goes up for dumping.
BACKGROUND OF THE INVENTION
A dump truck or production truck is a truck used for transporting loose material (such
as sand, gravel, or dirt) for construction. A typical dump truck is equipped with a
hydraulically operated open-box bed hinged at the rear, the front of which can be lifted
up to allow the contents to be deposited on the ground behind the truck at the site of
delivery. In the UK and Australia the term "Dump Truck OR Dumper applies to off-road
large equipment used in construction, Mining & Steel plant only. The smaller Dumpers
built on standard Truck chassis under road vehicle category are known as a tipper,
tipper lorry or tip truck.
The dump truck was first conceived in Saint John, New Brunswick when Robert T.
Mawhinney attached a dump box to a flat bed truck in 1920. The lifting device was a
winch attached to a cable that fed over sheave (pulley) mounted on a mast behind the
cab. The cable was connected to a lower front end of the wooden dump box which was
attached by a pivot at the back of the truck frame. The operator turned a crank to raise
and lower the box. Today, virtually all dump trucks operate by hydraulics and they
come in a variety of configurations each designed to accomplish a specific task in the
construction material supply chain.
A standard dump truck is truck chassis with a dump body (commonly known as Dallah)
mounted to the frame. The bed is raised by a hydraulic ram mounted under the front of
the dumper body between the frames, and at the back of the bed is hinged at the back
to the truck. The tailgate can swing on these hinges.
Tippers are extensively used inside the steel plant for internal transportation of
materials. The Tail gate is supposed to be closed during loading and movement of the
Tipper. The gate should open automatically during dumping of material. Flawless
operation of this gate is very important for safe operation of tippers. There are
following hazards which may lead to fatality:
- Poor sealing of Tail Gate: This will be resulting in spillage on road which may
turns dangerous for the following two wheelers or smaller vehicles.
- Tail gate does not open: This is more dangerous as the vehicle may topple
during tipping operation due to change of centre of gravity.

The tail gate of a tipper is at the rear of the dump body (Dallah). This is hinged at the
top and locked at the bottom by different arrangements. The available systems are as
follows:
Mechanical latch - Available in most of the contractor's vehicle. This is not spillage
proof. This has to be fixed manually. This is unsafe to open at the dump yard due to
general hazardous condition. There may by sudden fall of material which can cause
fatality to the man who opens the tail gate.
Spring loaded lock - This is very much maintenance prone. At times this does not get
opened causing unsafe situations. It becomes very costly for the fleet owners to
maintain this arrangement and ensure safe operation of the Tippers. Hence to come out
from regular problem at a cheaper cost they use simple mechanical latch arrangement.
Thus the closest known prior art in this area is the spring loaded mechanical lock and
manual make shift arrangement as being used in dumpers.
Hence, there was a need to find out a system which can eliminate the disadvantages of
the prior art.

OBJECTS OF THE INVENTION
Therefore it is an object of the invention to propose a mechanical tail gate arrangement
in a tipper, which is capable of operating the tail gate without direct involvement of
pneumatics or hydraulics that can reduce the cost and complexity of the system.
Another object of the invention is to propose a mechanical tail gate arrangement in a
tipper, which can avoid additional activities to open the tail gate and which has no
threat of toppling.
A further object of the invention is to propose a mechanical tail gate arrangement in a
tipper, which is able to make a perfect sealing to stop any spillage even when
transporting coal dust.
A still further object of the invention is to propose a mechanical tail gate arrangement in
a tipper, which is capable of opening the gate automatically during dumping of material.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Fig.1 - shows the dump body in hoist position
Fig.2 - shows the dump body, "L" shaped frame link and pin arrangement in rest
position

Fig.3- a photograph of a Tipper with Tail Gate and mounting hinges
Fig.4 - photographs of a) spillage b) Topple c) Spring loaded hook d) hook and roller
arrangement of a tipper
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE
INVENTION
The present invention relates to a system by which the Flap or tail gate (1) will open
automatically without any human intervention as the dallah goes up for dumping. It has
a linkage arrangement which is connected to the movement of Dallah. This new system
that has been found out to operate the Tail gate is carried out without direct
involvement of Pneumatics or Hydraulics to reduce cost and complexity of the system.
The movement of the dump body is utilized to operate the tail gate (1). One cross
beam (2) is fixed over the sub frame (3). Two "L" shaped frames (5) are designed
when the smaller ends (6) are welded at both sides with the tail gate (1) permanently.
The existing mountings at the top corners of tail gate (1) were removed. One additional
cross member is welded in the dump body near the earlier tail gate mounting to
improve strength and avoid deformation during the new system. New mounting (Hinge
points) positions are arranged over the dump body. Pin and bush systems (7) with
grease lubrication are disposed over the dump body. This is connected to the larger
side (8) of the "L" shaped frame. So, the tail gate can move around the hinge pin (7).
The longer arm (8) is then connected with the cross beam though a link and pin

arrangement (9). One turn buckle (10) is placed in between the ends of the linkage
providing means for minor adjustment in this linkage system (9).
Now when the dump body (11) goes up for dumping materials there is a pull at the end
of the longer arm (8) which in turn opens the tail gate (1). The opening of tail gate (1)
widens with the increase in the angle between link (9) and longer arm (8) of the frame.
The gate opens fully when the dump body (11) is raised at its maximum position. When
the dump body comes on its rest, the tail gate will be totally closed. As there is no
additional activity to open the tail gate and no threat of toppling, the operation is
smooth. The sealing is perfect as there is no spillage even while transporting coal dust.

WE CLAIM
1. A mechanical tail gate arrangement in a tipper, the said arrangement comprising:
fixing one cross beam (2) over a sub frame (3) of a tipper;
disposing a plurality of V shaped frames (5) in the two sides of the tipper;
welding the smaller ends (6) with the tail gate (1) permanently;
removing the existing mountings at the top comers of the tail gate (1);
welding an additional cross member in the dump body (11) near the earlier tail
gate mounting to improve strength and avoid deformation;
arranging new mounting positions over he dump body (11);
fixing a pin and bush system (7) with grease lubrication over the dump body
(11) and connecting the said system with the larger side (8) of the 'L' shaped
frame (5);
characterized in that,
the longer arm (8) is then connected with cross beam (2) through a link and pin
arrangement (9) wherein a turn buckle (10) is placed in between the ends of the
linkage to provide minor adjustment in the linkage system when the dump body
(11) goes up for dumping materials and pulls the end of the longer arm (8)
which in turn opens the tail gate (1).
2. The mechanical tail gate arrangement as claimed in claim 1, wherein the tail gate
moves around the hinge pin (7).

3. The mechanical tail gate arrangement as claimed in claim 1 and 2, wherein the
opening of tail gate is widen with the increase in the angle between link (9) and
longer arm (8) of the frame (5).
4. The mechanical tail gate arrangement as claimed in claim 1 to 3, wherein the
gate (1) opens fully when the dump body (11) is raised at its maximum position.
5. The mechanical tail gate arrangement as claimed in claim 1 to 4, wherein the tail
gate (1) is totally closed when the dump body (11) comes on its rest.

The present invention relates to a mechanical tail gate arrangement in a tipper. The
said arrangement consists of fixing one cross beam (2) over a sub frame (3) of a tipper,
disposing a plurality of 'L' shaped frames in the two sides of the tipper, welding the
smaller ends (6) with the tail gate (1). The existing mountings at the top corner of the
tail gate is removed when an additional cross member is welded in the dump body near
the earlier tail gate mounting to improve strength and avoid deformation. New
mounting positions are arranged over the dump body (11). A pin and bush system (7)
is fixed with grease lubrication over the dump body (11) and the said system is
connected with the larger side (8) of the 'L' shaped frame (5) wherein the longer arm
(8) is connected with cross beam (2) through a link and pin arrangement (9) and a turn
buckle (10) is placed in between the ends of the linkage to provide minor adjustment in
the linkage system when the dump body (11) goes up for dumping materials and pulls
the end of the longer arm (8) which in turn opens the tail gate (1).