FIELD OF INVENTION
The present invention relates to an improved brake mechanism adapted to a
dumper.
BACKGROUND OF THE INVENTION
The improvement of a dumper movement cannot be restricted while the dump
body is in raised condition. While the dump body is in raised condition, the
movement of dumper causes damage of overhead electrical installation disposed
on the public road. This type of incidence takes place when operator of dumper
becomes careless or forgets to retract the dump body in its original house after
unloading the waste materials. Due to a small amount of carelessness or an
oversight of the operator of the dump body, there are chances of causing large
accidents on the road. Actually this is due to lack in brake mechanism on the
existing dumper. In the existing mechanism the dumper will move while the
dump body is in raised condition. So, to overcome such technical problem in
dumper a new modified improved brake mechanism developed which will restrict
the movement of dumper until the dump body retracts in its original house from
raised condition. That means the dumper will move only when the dump body
will return back to its original house otherwise the dumper will not move. This
new mechanism of brake system prevents the actual cause of the accident that
takes place in the industry.
SUMMARY OF THE INVENTION
The inventors made a brainstorming work to find out an idea for installation of a
visible indicator rod in front of the dump body such that it will be easily visible by
the operator from cabin when the dump body is in fully retracted condition. To
make the indicator rod visible at the dark of night, the indicator rod was wrapped
with a radium tape. The set-up of indicator rod was to give an indication to the
operator of dumper that by looking the indicator rod, the operator of the dumper
can understand whether the dump body is fully retracted and rests of it own
housing or not. But this idea was not a full proof system as then also accident
takes place.
A further new idea was generated by the inventor that is to restrict the
movement of the dumper automatically when the dump body is in raised
condition. This system can be achieved with some modification in air flow path of
brake lines. The air flow circuit design of parking brake and emergency brake
was thoroughly inspected. The first step was modified in the air flow circuit of
service brake but it is observed the chances of service brake failure. Next step is
to system to parking brake circuit. A new modification was made and during
trials it works perfectly and satisfactorily. The new modification is nothing but to
install a modified valve which is being operated by the weight of dump body
which allows air to release the parking brake when the dump body is in retract
condition. The valve restricts air movement which results in engagement of
parking while dump body is in raised condition. Thus the new system is operated
in two conditions only.
• Dump body rest in housing - parking brake disengaged
• Dump body in raised condition - parking brake engaged
Now, the movement of the dumper is restricted while the dump body is in raised
condition. Due to the fact that there are no chances of such accidents. This
system is a full proof system as even if operator tries to move the dumper in
dump body raised condition. The dumper would not move due to auto operated
parking brake.
There is also another valve provided in circuit inside the cabin which helps in out
damping. If the operator wants to move dumper to a certain distance in dump
body raised condition he can manually operate the valve and can travel
BRIEF PESCRIPTION OF THE ACCOMPANYING DRAWINGS
Fig.l - shows a schematic view in the prior art where engine is in running,
parking brake off, secondary brake off.
Fig.2 - shows a schematic view in the prior art where engine is in running,
secondary brake off and parking brake on.
Fig.3 - shows a schematic view as per new invention where engine is in running,
dump body down, secondary brake on, parking brake on.
Fig.4 - shows a schematic view as per new invention where engine is in running,
dump body up, secondary brake off, parking brake off.
Fig.5 - shows a schematic view as per new invention where engine is in running,
dump body up, secondary brake off, parking brake off.
Fig.6,7,8 and 9 - shows a photo view of consequential effect of operating the
dumper with raised dump body according to prior art.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE
INVENTION
Fig. 1 and 2 shows the air from an air reservoir (1) supplying to an emergency
brake control valve or secondary brake valve (2). From emergency brake control
valve air passes to a T-joint (3). Air from one outlet of T' joint (3) passes to an
inversion valve and the air from the other outlet of T-joint (3) passes to a
parking control valve (4) through which air is passing to a parking and
emergency brake valve (10). Here the situation is that engine is running parking
brake is in off condition and secondary brake is also in off condition i.e. during
engine running if secondary brake (2) is off condition, parking brake control
valve (4) and emergency brake valve (6) will be in off condition. Fig.2 shows
that air line remains same, but engine running, secondary brake (2) is off and
parking brake (4) is on condition that means valve (4) controls the air flowing to
a valve (6).
As shown in Fig.3, this relates to a new improved brake mechanism as per
invention. Here air from the air reservoir (1) enters to a first T junction (3) and
from one outlet of T' junction (3) air passes through a first horn valve (7) and
next air enters to a first end of a shuttle valve (8). The air from the other outlet
of T' junction (3) passes through a second horn valve (7A) and enters in the
second way of shuttle valve (8). From the shuttle valve (8) air passes to an
emergency brake valve (2). From valve (2) air enters into a second 'T' junction.
Air passes through one outlet of second 'T' junction (3A) to a parking valve (4)
which controls air flow to parking and emergency brake valve (6). The air passes
through the second outlet of' T'junction (3A) to an inversion valve (5).
When the dump body at rest in it's house (shown downward arrow in Fig.3), the
first horn valve (7) actuates and air passes through horn valve (7) to a shuttle
valve (8) and from shuttle valve air passes to existing system. At this movement
the dumper is allowed to move anywhere.
When the dump body is in working i.e. not at rest in its housing (as shown in
Fig.4 by an upward arrow), the first horn valve (7) is closed and the second horn
valve (7A) is also remain closed, the air will not be allowed to pass in the system,
as a result both the secondary brake (2) and parking brake valve (4) will be in
off condition. At this situation the dumper will not move, only the dump body will
function.
When the dump body is working and the operator requires to move the dumper
for a certain time. At this situation, the operator will manually operate the
second horn valve (7A) because first horn valve (7) is closed (as shown in Fig.5
by a downward arrow) and air will pass through the second horn valve (7A) to
the shuttle valve (8) which will cater air to the existing system and release
emergency brake valve (2) and parking brake valve (4) and it will allow the
dumper to move during the working condition of dump body. After completion of
dumper movement, the operator will close the second horn valve (7A) which
closes the air flow in the existing system and again the emergency brake valve
(2) and parking brake valve (2) is in off condition. At this situation only dump
body will work and dumper will not move.
LEGEND
SERW NO. CHARACTERS
1 Air Reservoir
2 Emergency Brake Control Valve
3, 3A T Joint
4 Parking Brake Control Valve
5 Inversion Valve
6 Parking & Emergency Brake Valve
7, 7A Horn Valve
8 Shuttle Valve
WE CLAIM
1. An improved brake mechanism to restrict dumper movement while the
dump body is functioning comprises:
- installation of a 'T' junction (3A) in the airline after air reservoir (1)
in series;
- installation of two sets horn valve (7, 7A) connected parallely from
'T'junction (3A) outlet air lines;
- installation of one shutter valve (8) connected at outlet of two horn
valve (7, 7A) air line from where air is supplying and in the existing
brake system;
characterised in that the said horn valve (7) is auto-controlled by
the dump body weight itself to restrict the movement of dumper
and horn valve (7A) is manually operatable by the operator to
control the dumper movement on emergency basis.

The present invention relates to An improved brake mechanism to restrict dumper movement while the dump body is functioning comprises installation of a 'T' junction (3A) in the airline after air reservoir (1) in series and installation of two sets horn valve (7, 7A) connected parallely from 'T' junction (3A) outlet air lines and installation of one shutter valve (8) connected at outlet of two horn valve (7, 7A) air line from where air is supplying and in the existing brake system characterised in that the said horn valve (7) is auto-controlled by the dump body weight itself to restrict the movement of dumper and horn valve (7A) is manually operatable by the operator to control the dumper movement on emergency basis.