FORM 2
THE PATENT ACT 1970
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
1 I. TITLE OF THE INVENTION: Twin Roller Assembly
2. APPLICANT
(a) NAME: Universal Construction Machinery & Equipment
Ltd
(b) NATIONALITY: Indian Company registered under the provisions
of The Companies Act, 1956
(c) ADDRESS: Gate No. 327/328/329, A/P-Shivare, Tal. 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.

Twin Roller Assembly
Field of the invention
The present invention relates to construction equipment, and more particularly to a roller assembly for supporting and guiding a concrete mixing drum.
Background of the invention
Conventionally, a single roller assembly is used for supporting and guiding a mixing drum of a concrete mixer. Specifically, the single roller assembly is made up of casting material. The single roller assembly is mounted and fitted on main chassis and is aligned with drive shaft assembly of the concrete mixer. The roller of the single roller assembly has taper shape, which is suitable for matching with gear ring shape. Further, bearing is provided to the roller for easy rotation of the roller. The figure 1 shows perspective view of the single roller assembly (100) of the prior art.
However, the single roller assembly made up of casting has less strength. Further, the single roller assembly is difficult for maintenance due to inbuilt bearing and shaft. Furthermore, during replacing the bearing and the roller, the single roller assembly required to be removed from machine. Also, the single roller assembly produces more vibrations due to single point contact between rollers and mixing drum assembly.
Accordingly, there exists a need to provide a roller assembly which overcomes all the drawbacks of the prior art.
Objects of the invention
An object of the present invention is to provide a twin roller assembly, which provides rigid support and quick alignment for the mixing drum of the concrete mixer.

Another object of the present invention is to provide a twin roller assembly, which supports and guiding a mixing drum.
Yet another object of the present invention is to provide a twin roller assembly, which provides less vibration as compared to the roller assembly of prior art.
Summary of the invention
Accordingly, the present invention provides a twin roller assembly for supporting and guiding a concrete mixing drum, the twin roller assembly comprising;
a base having a bracket mounted thereon;
a shaft positioned on the bracket;
a first bracket plate mounted on a first end of the shaft and a second bracket plate mounted on a second end of the shaft, wherein a distal end portion of the first bracket plate and the second bracket plate are positioned at an upper level than the proximal end portion thereof;
a top roller assembly having at least two rollers, the top roller assembly disposed on distal end portion of the first bracket plate and the second bracket plate; and
a bottom roller having at least two rollers, the bottom roller assembly disposed on proximal end portion of the first bracket plate and the second bracket plate, each roller of the top roller assembly and the bottom roller assembly having a bearing disposed for smooth rotation thereof, wherein the bottom roller assembly supports a mixer drum gear ring.
Brief description of the drawings
Figure 1 shows a perspective view of a single roller assembly of the prior art;
Figure 2 shows a perspective view of a twin roller assembly in accordance with the present invention; and

Figure 3 shows an exploded view of the twin rollers assembly of figure 2.
Detailed 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 twin roller assembly for supporting and guiding a mixing drum of the concrete mixer. The twin roller assembly provides a rigid support and quick alignment for the mixing drum of the concrete mixer. Further, the twin roller assembly provides support for mixing drum which has strength. Furthermore, the twin roller assembly support for mixing drum provides less vibration as compared to prior art rollers.
The present invention is illustrated with reference to the accompanying drawings, throughout which reference numbers indicate corresponding parts in the various figures. These reference numbers are shown in bracket in the following description.
Referring now to figure 2 and 3, there is shown a twin roller assembly, in accordance with the present invention.' Specifically, figure 2 shows a perspective view'of the.,■twin roller assembly (200) (hereinafter the 'assembly (200)) and figuK^^hows an exploded view of the assembly (200) of figure 2.
The assemblyMncIudes a base (10), a shaft (20), a first bracket plate (30), a second bracket.'plate (40), a top roller assembly (50), and a bottom roller assembly (60).

The base (10) includes a bracket (12) mounted thereon. Further, the shaft (20) is positioned on the bracket (12). The bracket (12) includes two spaced apart supports on which the shaft,(20) is. mounted horizontally. The shaft (20) is provided with a grease cup (22) for lubrication thereof.
The;first bracket plate (30) is mounted on a first end (not numbered) of the shaft (20). Further, the second bracket plate (40) is mounted on a second end (not numbered) of the shaft (20). In an embodiment, the first bracket plate (30) and the second bracket plate (40) are elongated inwardly curved plates mounted on the shaft (20).
Specifically, the first bracket plate (30) and the second bracket plate (40) are mounted on the shaft (20) in such a way that a distal end portion (30a) of the first bracket plate (30) and a distal end portion (40a) the second bracket plate (40) are at an upper level than the proximal end portion (30b, 40b) thereof.
Further, the top roller assembly (50): includes at least two rollers (50a, 50b). The top roller assembly (50) is disposed on the distal end portion (30a) of the first bracket plate(30) and distal end portion (40a) the second bracket plate (40) respectively.
Furthermore, the bottom roller assembly (60) includes at least two rollers (60a, 60b). The bottom roller assembly (60)' js disposed on the proximal end portion (30b) of the first bracket plate (30) and the proximal end portion (40b) of the second bracket plate (40) respectively.
Each roller of the top roller assembly (50) and the bottom roller assembly (60) includes a bearings disposed thereon for-Smooth rotation thereof. For example, as shown figure. 2, the roller (60a) includes a bearing (70). The bottom roller assembly (60) supports a mixerrdfumigear ring (not shown) thereon.

Further, the bearings are also provided with greasing nipples for lubrication thereof. For example, the bearing (70) is provided with greasing nipple (72). The bearings give support to top roller assembly (50) and the bottom roller assembly (60) and helps in smooth rotation thereof. The assembly (200) also includes spring washers, hexagonal bolt, hex nut, and plain washer and the like for fastening the bearings (70) and the top roller assembly (50) and the bottom roller assembly (60) on the first bracket plate (30) and the second bracket plate (40).
Specifically, two twin roller assembly (200) are required to mount the mixing drum, wherein each bottom roller assembly (60) of the twin roller assembly (200) supports the mixing drum thereon. The assembly (200) ensures smooth rotation of the mixer drum and reduces wear and tear. Further, the assembly (200) provides alignment of mixing drum with pinion gear.
Advantages of the present invention
1. The assembly (200) of the present invention is smooth in operation and
produces very less noise while working. '
2. , fThe assembly (200) is easy for setting and alignment with mixer drum is
possible easy;
3. The.assembly (200) is simple in design and very easy for maintenance.
4. Life'of the roller, gear ring and drum is increased due to smooth rotation.
5. The assembly (200) is rigid and strong and weight is reduced as mounting bracket is Removed.
6. Machining of components is very easy due to forming process.
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 twin roller assembly for supporting and guiding a concrete mixing
drum, the twin roller assembly comprising:
a base having a bracket mounted thereon;
a shaft positioned on the bracket;
a first bracket plate mounted on a first end of the shaft and a second bracket plate mounted on a second end of the shaft, wherein a distal end portion of the first bracket plate and the second bracket plate are positioned at an upper level than the proximal end portion thereof;
a top roller assembly having at least two rollers, the top roller assembly disposed on distal end portions of the first bracket plate and the second bracket plate; and
a bottom roller assembly having at least two rollers, the bottom roller assembly disposed on proximal end portion of the first bracket plate and the second bracket plate, each roller of the top roller assembly and the bottom roller assembly having a bearing disposed for smooth rotation thereof, wherein the bottom roller assembly supports a mixer drum gear ring.
2. The twin roller assembly of claim 1, wherein the shaft is provided with a
grease cup for lubrication.
3. The twin roller assembly of claim 1, wherein the bearing is provided
witn gneasing nipples for lubrication thereof.