FORM 2
THE PATENT ACT 1970
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
1. TITLE OF THE INVENTION:
"Reversible Concrete Mixer"
2. APPLICANT
(a) NAME: Universal Construction Machinery & Equipment
Ltd.
(b) NATIONALITY: Indian Company registered under the provisions
of The Companies Act, 1956
(c) ADDRESS: Gat No. 327/328/329, A/P-Shivare,
Tai. Bhor, Dist. - Pune -411005. M.S. India
3. PRREAMBLE TO THE DESCRIPTION
COMPLETE
The following specification particularly describes the invention and
the manner in which it is to be performed.

Reversible Concrete Mixer
Field of the invention
The present invention relates to a concrete mixer, and more particularly, to a reversible concrete mixer capable of removing the ready concrete mix automatically.
Background of the invention
Concrete mix for construction work is prepared by various methods. Until recent developments, the concrete mix was prepared by manual mixing of raw material by hands. However, this method was time consuming and mixing of the raw material was improper. To overcome this drawback, a hand driven concrete mixing machine was developed so as to get uniform mixing of the raw material. However, the hand driven concrete mixer had a disadvantage of less mixing capacity and manual operation. Accordingly, motorized concrete mixers were developed. The motorized concrete mixers available presently in the market can be operated electrically or by use of diesel engine. Further, the dual powered concrete mixing machines are also available which are powered either with diesel engines or electrical motors.
Conventional motorized concrete mixer comprises a hopper, a water tank for supplying water for preparing the concrete mix and a revolving mixing drum to mix the raw material received from the hopper. Once the concrete mix is prepared in the mixing drum, the mixing drum has to be tilted manually, so as to remove the ready concrete mix out of the mixing drum. However, such manual operation of the mixing drum decreases the productivity of the concrete mix. Further, the raw material received from the hopper is not weighed and therefore not every batch of the concrete mix is consistent in quality.

Accordingly, there exists a need for an automatically operating mixing drum to remove the mixed ready concrete from the mixing drum. Further, there also exists a need for a mixing drum which provides a consistent concrete mix.
Drawbacks of the prior art
1. The mixing drum is rotated manually which reduces the productivity of the concrete mixing process.
2. The mixing drum is required to be tilted manually to remove the ready mix.
3. The manually addition and mixing of the raw material gives inconsistent and low quality of concrete ready mix.
Objects of the present invention
An object of the present invention is to provide a reversible concrete mixer having a mixing drum which is capable of removing the concrete mix automatically.
Another object of the present invention is to provide a reversible concrete mixer, which weighs all raw materials to be mixed so as give a consistent and good quality concrete mix.
Summary of the invention
The present invention provides a reversible concrete mixer comprising;
a chassis assembly forming a base;
an 'U' shaped assembly configured on the chassis assembly;
a mixing drum mounted on the 'U' shaped assembly, the mixing drum mounted within a top roller bracket and a roller assembly, wherein the top roller bracket and a roller assembly reduces friction and helps in rotation of the mixing drum;
a rotating means for rotating the mixing drum;

a hopper mounted on the chassis assembly to deliver correct amount of raw material into the mixing drum for mixing;
a water tank mounted on the chassis assembly which provides exact amount of water during mixing of the raw material to prepare a concrete mix; and
load cells for sensing weight of the raw material in the hopper, the load cells connected to a display in a control panel thereby providing a correct amount of raw material to be mixed in a mixing drum, characterized in that,
the mixing drum comprises,
a pair of mixing blades disposed on inner surface of the mixing drum, wherein the pair of blades are capable of mixing the raw material in the mixing drum upon rotating the mixing drum in clockwise direction;
a pair of screw blades disposed on inner surface of the mixing drum, wherein the pair of screw blades are capable of transferring the concrete mix from a raw material receiving end of the mixing drum to a discharge end of the mixing drum, and
a pair of discharge blades disposed on inner surface of the mixing drum, wherein the pair of discharge blades are capable of removing the concrete mix out of the mixing drum, the discharge blades being directed toward the discharge end of the mixing drum to establish a flow of the ready concrete mix towards discharge end upon rotating the mixing drum in anti-clockwise direction.
Typically, wherein the roller assembly includes a top roller holding assembly for rotating the mixing drum in anti-clockwise direction.
Brief description of the drawings
Figure 1 depicts an exploded view of a reversible concrete mixer according to the present invention; and

Figure 2 depicts an exemplary view of mixing blades of the reversible concrete mixer according to the present invention.
Detail description of the invention
The foregoing objects of the present invention are accomplished and the problems and shortcomings associated with the prior art, techniques and approaches are overcome by the present invention as described below in the preferred embodiments.
The present invention provides a reversible concrete mixer having a mixing drum which is capable of removing the concrete mix automatically. Further, the reversible concrete mixer weighs all raw materials 10 be mixed so as give a consistent and good quality concrete mix.
The present invention is illustrated with reference to the accompanying drawings, throughout which reference numbers indicate cot-responding parts in the various figures. These reference numbers are shown in bracket in the following description.
Referring now to figure 1, there is shown an exploded view of a reversible concrete mixer (100) according to the present invention. Specifically, the figure 1 shows the concrete mixer (100). The concrete mixer (100) includes a chassis assembly (10), a 'U' shaped assembly (20), a mixing drum (30), a rotating means (not numbered), a hopper (40), a water tank (50), and load cells (not shown), and control panel (60). Characterized in that, the mixing drum (30) includes a pair of mixing blades (32), a pair of screw blades (34), and a pair of discharge blades (36).

The chassis assembly (10) forms the base for the reversible concrete mixer (100). The chassis assembly (10) is configured with a 'U' shaped assembly (20) which provides support for a mixing drum assembly (30). The mixing drum (30) is mounted within a top roller bracket and roller assembly (22) which reduces the friction and helps in easy rotation of the mixing drum (30). Specifically, the mixing drum (30) is guided by a top roller holding assembly (24) during rotation. When the mixing of the raw material is complete in the mixing drum (30), the top roller holding assembly (24) guides the drum gear ring assembly to rotate the mixing drum (30) in anti-clockwise direction so that the mixing drum (30) starts discharging the ready concrete mix. Further, the top roller assembly (24) is provided with a compression spring (not numbered) which maintains the tension of the top roller assembly (24).
Further, the mixing drum (30) includes bottom roller twin assembly (26) which reduces the friction and helps in easy rotation of the drum (30). The reversible concrete mixer (100) further includes a rotation means for rotating the mixing drum (30). For example, a mixing dram drive assembly includes a motor (not shown), which rotates the mixing drum (30). The motor is covered with a cover. Moreover, the motor includes a handle (not numbered) assembly which may be used to rotate mixing drum (30) manually in a situation when electricity is not available. In an embodiment, Hex nuts and Hex bolts are used as a fastener in a top roller bracket and roller assembly (22).
Furthermore, the reversible concrete mixer (100) comprises a hopper (40) with brackets which delivers the correct amount of the raw material into the mixing drum (30) for mixing. The hopper (40) is configured with load cells which sense the weight of the material in the hopper (40) and provides a display in a control panel (60) so that correct amount of raw material can be mixed in a mixing drum (30). The hopper (40) is mounted on the chassis assembly (10) with the help of a hopper pedestal (not numbered). Further, the hopper (40) is powered by a hydraulic cylinder (42) which provides the power for lifting the hopper (40).

Furthermore, the hopper (40) is configured with a pivot bracket support assembly, which supports the hopper pivot brackets (44). The hopper pivot bracket (44) helps in vertical movement of the hopper assembly (40).
The reversible concrete mixer (100) also includes a water tank (50) with a scale bar for storing and measuring water. The water tank (50) is mounted on a water tank mounting bracket (52) which provides exact amount of water during mixing of the raw material to prepare concrete mix. The water tank (50) is configured with a water tank leveler assembly (54), which helps to identify the water level therein.
The control panel (60) of the reversible concrete mixer (100) includes control switches and indicators for controlling the operation of the reversible concrete mixer (100). Further, the reversible concrete mixer (100) is configured with oil tank assembly which is used to store oil for lubrication purpose. A tool box assembly is also provided in reversible concrete mixer (100) enables storage of ail tools required for maintenance and smooth working of the reversible concrete mixer (100).
Specifically, the chassis assembly (10) is provided with a jack leveling assembly (12) which lifts wheels of the reversible concrete mixer (100) and takes the load thereof. The jack pin locks the jack assembly (12) at one place. An axle with a hub and a wheel assembly engages the wheels for easy mobility of the reversible concrete mixer (100),
Characterized in that the mixing drum (30) includes a pair of mixing blades (32), a pair of screw blades (34) and a pair of discharge blades (36).
Referring now to figure 2, there is shown an exemplary view of mixing blades of the mixing drum (30). The mixing drum (30) includes a pair of mixing blades (32) disposed on inner surface of the mixing drum (30). The pair of mixing blades (32)

Is used to mix the raw material present in the mixing drum (30) when the mixing drum (30) is rotated in clockwise direction. Further, the mixing drum (30) includes a pair of screw blades (34) disposed on inner surface of the mixing drum used to transfer the ready concrete mix from a raw material receiving end (38) of the mixing drum (30) to a discharge end (39) of the mixing drum (30). Furthermore, the mixing drum includes a pair of discharge blades (36) disposed on inner surface of the mixing drum which are used to remove the ready mix out of the mixing drum (30). The discharge blades (36) are directed toward the discharge end (39) of the mixing drum (30) to establish a flow of the ready concrete mix towards discharge end in response to rotation of the mixing drum (30) in anti-clockwise direction.
The reversible concrete mixer (100) of the present invention has a batch capacity of about 300 liter for unmixed raw material. Alternatively, the reversible concrete mixer (100) may be designed for batch size of about 550 liters, 800 liters, 1050 liters , 1400 liters and 1700 liters. The reversible concrete mixer (100) of present invention has an output of about 4.8 Cu M/hr and requires electrical motor of 3Hp. However, it is evident to one skilled in the art to vary the power requirement according to the capacity of the reversible concrete mixer (100). Total weight of the reversible concrete mixer (100) is around 900 kg.
Advantages of the present invention
1. Tilting of the concrete mixing drum (30) manually is not required to remove the ready mixture.
2. All the ingredients of the raw material are weighed and then mixed, so as to get consistent and good quality concrete mix every time.
3. The semiautomatic operation of the concrete mixer increases the productivity of the concrete mixing process.

4. The concrete mixer has low vibrations which increases the life of the machine.
The foregoing descriptions of specific embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the present invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the present invention and its practical application, to thereby enable others skilled in the art to best utilize the present invention and various embodiments with various modifications as are suited to the particular use contemplated. It is understood that various omission and substitutions of equivalents are contemplated as circumstance may suggest or render expedient, but such are intended to cover the application or implementation without departing from the spirit or scope of the present invention.

We claim
1. A reversible concrete mixer comprising:
a chassis assembly forming a base for mounting; an circular assembly configured on the chassis assembly; a mixing drum mounted in the circular assembly, within a top roller bracket and a roller assembly, wherein the top roller bracket and a roller assembly reduces friction and helps in rotation of the mixing drum; a rotating means for rotating the mixing drum;
a hopper mounted on the chassis assembly to deliver correct amount of raw material into the mixing drum for mixing:
a water tank mounted on the chassis assembly, which provides exact amount of water during mixing of the raw material to prepare a concrete mix; and load cells for sensing weight of the raw material in the hopper, the load cells connected to a display of a control panel thereby providing a correct weight of raw material to be mixed in a mixing drum, characterized in that, the mixing drum comprises.
a pair of mixing blades disposed on inner surface of the mixing drum, wherein the pair of blades are capable of mixing the raw material in the mixing drum upon rotating the mixing drum in clockwise direction;
a pair of screw blades disposed on inner surface of the mixing drum, wherein the pair of screw blades are capable of transferring the concrete mix from a raw material receiving end of the mixing drum to a discharge end of the mixing drum, and
a pair of discharge blades disposed on inner surface of the mixing drum, wherein the pair of discharge blades are capable of removing the concrete mix out of the mixing drum, the discharge blades being directed toward the discharge end of the mixing drum to establish a flow of the ready concrete mix towards discharge end upon rotating the mixing drum in anti-clockwise direction.

2. The reversible concrete mixer of claim 1, wherein the roller assembly includes a top roller holding assembly for rotating the mixing drum in anti-clockwise direction.