FORM - 2 THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2006
COMPLETE
Specification
(See Section 10 and Rule 13) Composite Manhole cover with Modular Reinforcement part
MUTUAL INDUSTRIES LTD.
an Indian Company,
of 9, Ehara Industrial Complex, Waliv, Vasai (E)
Mumbai - 401 208, Maharashtra, India.
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE NATURE OF THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED

Field of the invention
The present invention relates to a polymer molded composite Manhole Cover for Infrastructure. More specifically, the present invention relates to a Manhole cover assembly made up of reinforced thermoplastic or thermoset material which uses modular design construction.
Background of the invention
The manhole cover provides protective shielding for opening in conduit, underground tunnel, drainage sewer and Cable trenching. The main function of manhole cover is to prevent the failing of street walker or vehicle in to pit or drainage and provide the surface Support.
Previously manhole cover are manufactured by pressure die-casting of heavy steel, or concrete which make them too heavy for installation, transportation and at the same time they are more dangerous as injury may occur to the person handling it or street walker.
The manhole cover made up of steel and concrete causes interference to radio signals and also these manholes are very difficult to handle for wireless meter reading process.
Due to recent developments in reinforced plastic, use of plastic is becoming more famous in composite manhole cover manufacturing. Use of plastic as composite material has various issues such as high production investment, production volume limitation and tendency to crack when subjected to high load condition like 12.5 Ton, 25 Ton, 40 Ton and 60 Ton requirements.
Hence, there is a need of a manhole cover that is light in weight with composite material and has a manufacturing process that can cater need of volume

production. Also there is a need of the composite manhole cover that takes care of high load requirement like 12.5 Ton, 25 Ton, 40 Ton and 60 Ton.
Objects of the invention
An object of the present invention is to use light weight composite material and Design construction that provides high volume effective manufacturing process and also resolves the failure of manhole cover against high load application like 12.5 ton, 25 Ton, 40 Ton and 60 Ton.
Another object of the present invention is to allow transfer of load from cover to its respective frame surface without affecting the integrity of components in modular construction.
Yet another object of the present invention is to provide reinforcement to it in the form of glass reinforced pre-peg or Tape and pultrusion as per requirement for load bearing.
Summary of the invention
Accordingly, the present invention provides a manhole cover assembly for infrastructure requirement. The manhole cover assembly consist of upper plate, an Modular reinforcement part and plurality of reinforcement features and reinforcement types like pultrusion, Pre-peg composite mat or Tap. The upper plate is made up of a composite material having a platform with a vibration welding ribs. The modular reinforcement is configured with plurality of ribs for a different shape of the manhole cover. The reinforcement part upper includes a plurality of rectangular, triangular rib shapes forming an inner surface on half part and forming a matching receiving surface on the other half. The base part is identical to upper part and manufactured from same mould only rotated and oriented in such a way that it will facilitate receiving surface of upper part with

press fit or adhesive bonded assembly. Upon application of load on a upper plate, the plate transfers load on the assembly of reinforcement part which subsequently transfers the load to the surrounding frame thus facilitating distribution of the load on the frame body.
The manhole cover formed from Polymer composite material like Long glass polypropylene, Long glass Nylon, Polyester and Vinyl ester composite, Unsaturated Polyester.
Brief description of drawings
Figure 1 illustrates a Rectangular/Square Manhole cover Assembly with features and basic components, in accordance with the present invention;
Figure 2 illustrates a Rectangular/Square Manhole cover reinforcement part Assembly with basic components, in accordance with the present invention;
Figure 3 illustrates a exploded view of a Rectangular/Square Manhole cover reinforcement part Assembly basic components, in accordance with the present invention;
Figure 4 illustrates a cross sectional view of Rectangular/Square Manhole cover reinforcement part Assembly along A-A;
Figure 5 explain a cross sectional view of Rectangular/Square Manhole cover reinforcement part Assembly along B-B;
Figure 6 illustrates a sectional view of Rectangular/Square Manhole cover reinforcement part Assembly along C-C, in accordance with the present invention;

Figure 7 shows a sectional view of Rectangular/Square Manhole cover reinforcement part Assembly along CI-CI, in accordance with a another embodiment of the present invention;
Figure 8 illustrates a Circular Manhole cover Assembly, in accordance with the present invention;
Figure 9 illustrates a Circular Manhole cover Assembly with basic components, in accordance with the present invention;
Figure 10 illustrates a cross sectional view D-D through horizontal plane of Circular Manhole cover Assembly;
Figure 11 explains a cross sectional view Circular Manhole cover reinforcement part Assembly along E-E;
Figure 12 shows a sectional view Dl- Dl through horizontal plane of Circular Manhole cover Assembly, in accordance with a another embodiment of the present invention;
Detailed description of the invention
The foregoing objects of the 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 embodiment.
Accordingly, the present invention provides a Manhole cover assembly which is designed to transfer the street walker and heavy vehicles weight load from

manhole to the frame. The present invention acts as a cover for Gully, Manhole, cable trenching, Utility Box and Junction Box.
For a thorough understanding of the present invention, reference is to be made to the following detailed description, including the appended claims, in connection with the above-described drawings. Although the present invention is described in connection with exemplary embodiments, the present invention is not intended to be limited to the specific forms set forth herein. It is understood that various omissions and substitutions of equivalents are contemplated as circumstances may suggest or render expedient, but these are intended to cover the application or implementation without departing from the spirit or scope of the claims of the present invention. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. 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 to figures 1 and 2, the details of a Rectangular / Square Manhole Assembly 10 for an infrastructure use like gully, manhole, and 'utility box in accordance with the present invention is shown. The Rectangular / Square Manhole Assembly 10 comprise Manhole cover plate 11, Manhole cover reinforcement part Assembly 12. The manhole cover assembly 10 of the present invention is made up of a composite material. The Manhole cover plate 11 includes a plurality of grooves configured thereon. The plurality of grooves on the plate 11 provides an anti-skidding feature to the Manhole.
The Manhole cover reinforcement part assembly 12 of the present invention consists of on one side of the Manhole cover reinforcement cover part 20 and below it Manhole covers reinforcement base part 21 by using a fixing mean as

per Figure 2. Actually the reinforcement cover part 20 and reinforcement base part 21 are identical part manufactured from same mould having the modular inserting and receptacles features which forms press fit types of assembly.
The Figure 3 explain the plurality of modular inserting and receptacles features like inserting Box features 30, receptacles Box features 31, inserting rib features 32, receptacles rib features 33 of reinforcement cover part 20 and reinforcement base part 21. The Inserting box feature 30 form the pattern with variable dimensions on one half sides 36 of the part. In the same way there are horizontal and vertical placement of inserting rib features 32 in the same half 36. Whereas the receptacle box features 31 form the respective receptacles pattern on the other half 37. In line to this arrangement respective horizontal and vertical receptacles rib features 33 are placed on the other half 37.
The cover part 11 and base part 12 also consists of glass resin pre-peg mat or tapes at the area (not shown in figure) where possibility of induced stresses are more during its use.
The section views in the figure 4, figure 5, and figure 6 explain the Manhole cover reinforcement part assemblyl2 Which is made as per following steps.
1. Manufacturing of cover part 20 from the mold as per plurality of feature describe above.
2. Manufacturing of base part 21 from the same mold.
3. Rotating the base in order to align one end of the base with an opposite end of the cover.
4. Inserting the Inserting features of cover in to the receptacles feature of base and vice versa.
The inserting Box features 30 and inserting rib feature 32 secured with receptacles Box features 31 and receptacles rib features 33 by mean of plurality Assembly process as below.

1. Plastic Press fitment between inserting and receptacles feature's faces.
2. Adhesive bonding between inserting and receptacles feature's faces.
3. Convection welding between inserting and receptacles feature's faces.
4. Another fixing mean of the present invention includes using nut/screws mounting Insert 34 and Flange Sleeve 35 by using bolts at the corner area of Manhole.
In the present invention, figure 7 showcases another embodiment where the pattern of pultrusion part 50 is being used as reinforced material which will connect the two horizontal side support of manhole especially when load bearing requirement is very high. These pultrusion members are sandwich between two modular reinforced parts (Cover and Base) and fixed with adhesive to the one of the part as shown in the figure by feature 51.
Referring to figures 8, the details of a Circular Manhole Assembly 100 for an infrastructure use like gully, manhole, and utility box in accordance with the present invention is shown. The Circular Manhole Assembly 10 comprises Manhole cover part 101, Manhole base part Assembly 102. The manhole cover assembly 100 of the present invention is made up of a composite material. The Manhole cover plate 101 includes a plurality of grooves configured thereon. The plurality of grooves on the plat 101 provides an anti-skidding feature to the Manhole.
Actually the cover part 101 and base part 102 are the identical part from same mold having the modular inserting and receptacles features which form the press fit types of assembly.
The Figure 9 explain the plurality of modular inserting and receptacles features like inserting rib features 201, receptacles rib features 202 of Cover part 101 and base part 102. There are circular and axial placement pattern of inserting rib

features 201 in the part half 203, whereas the receptacle rib features 202 form the respective receptacles pattern on the other part half 204.
The cover part 101 and base part 102 are also consists of glass resin pre-peg mat or tapes at the area (not shown in figure) where possibility of induced stresses are more during use.
The section views in the figure 10, figure 11 explain the Circular Manhole cover reinforcement part assembly 100 which is made as per following steps.
1. Manufacturing of cover part 101 from the mold as per plurality of feature above describe features.
2. Manufacturing of base part 102 from the same mold.
3. Rotating the base in order to aligned the end of the base with an opposite end of the cover.
4. Inserting the Inserting features of cover in to the receptacles feature of base and vice versa.
The inserting rib features 201 secured with receptacles Box features 202 by mean of plurality Assembly process as below.
1. Plastic Press fitment between inserting and receptacles feature's faces.
2. Adhesive bonding between inserting and receptacles feature's faces.
3. Convection welding between inserting and receptacles feature's faces.
4. Another fixing mean of the present invention includes using nut/screws mounting Insert 34 and Flange Sleeve 35 by using bolts at the corner area of Manhole.
In the present invention, figure 12 showcases another embodiment where the pattern of pultrusion part 400 is being used as reinforced material which will connect the two side support passing through the circle axis of manhole especially when load bearing requirement is very high. These pultrusion members are sandwich between two modular reinforced parts (Cover and Base)

and fixed with adhesive to the one of the part as shown in the figure by feature 401.
Advantages of the present invention
1. From the above description it is clear that invention had overcome the disadvantages of molding process where rib thickness are limitations, by constructing the two part in such a way that it will form rib thickness double than single part rib. These higher rib thickness obtain with this method will serve the purpose of load bearing requirement with higher productivity from part production perspective.
2. Light weight composite manhole cover in composite material. This will help for ergonomically easy installation and transportation and avoid back pain inj ury of operator.
3. No corrosion issue when compare with Metal casted product. Better durability and more life as compare to concrete product.
4. Due to use of polymeric material less interference to the radio frequency transmission specifically use of utility bin or junction boxes cover for telecom, railway industries. At the same time these cover are easy for handling during meter reading 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 Manhole cover assembly 10 for Gully, Manhole, cable trenching and
Utility Box, Junction box comprising:
A cover part 20 and the base part 21 are made up of a composite material with a plurality of features thereon;
A parts consist of pattern of plurality of inserting box 30 and Inserting rib 32 configured with one side of part half and pattern of receptacle box 31 and receptacle rib 33 on another side of the part half;
An manhole cover assembly 12 made of such type of modular identical cover part and base part by Rotating the base in order to aligned the end of the base with an opposite end of the cover with fixing means;
wherein upon passing of a heavy load like human, animals, vehicles on the manhole cover assembly 10, the cover 10 transfers load on the closed form and higher thickness rib formed by plurality of inserting and receptacle features which subsequently transfer the load to the side frame thereby facilitating distribution of the load.
2. A Manhole cover assembly 100 for Gully, Manhole, cable trenching and
Utility Box, Junction box comprising:
A cover part 101 and the base part 102 are made up of a composite material with a plurality of features thereon;

A part consist of pattern of plurality of Inserting rib 201 configured with one side of part half and pattern of receptacle rib 202 on another side of the part half;
An manhole cover assembly 100 made of such type of modular identical cover part and base part by Rotating the base in order to aligned the end of the base with an opposite end of the cover with fixing means;
wherein upon passing of a heavy load like human, animals, vehicles on the manhole cover assembly 100, the cover 100 transfers load on the closed form and higher thickness rib formed by plurality of inserting and receptacle features which subsequently transfer the load to the side frame thereby facilitating distribution of the load.
3. The manhole cover assembly as per claim 1 and 2, wherein the parts are being formed by injecting long glass, short glass filled resin like polypropylene, nylon in a mold or two coat resins molding of polyester, vinyl ester glass filled material or Sheet molded unsaturated polyester, HDPE concrete, PVC and thermoplastic glass mat or composite pre-peg mat.
4. The manhole cover assembly as per claim 1 and 2, wherein the reinforcement composite material is a thermoplastic glass mat or composite pre-peg mat or composite tape.
5. The manhole cover assembly as per claim 1 and 2, wherein the cover part
and base part are formed from same mold and having modularity of features.
6. The manhole covers assembly as per claim 1 and 2, wherein the plurality
of pattern of inserting features and pattern of receptacle features facilitates
an assembly process.
7. The manhole covers assembly as per claim 1 and 2, wherein the assembly
fixing is achieved by any of following means.

a. Plastic Press fitment between inserting and receptacles features faces.
b. Inserting and receptacles features with Adhesive bonding between the
faces.
c. Convection welding between inserting and receptacles features faces.
d. Another fixing mean by using nut/screws mounting Insert 34 and Flange
Sleeve 35 by using bolts at the corner area of Manhole.
8. Overcoming the disadvantages of molding process where rib thicknesses
are limitations, by construction the two parts in such a way that it will form
rib thickness double than single part rib. These higher rib thickness obtain
with this method will serve the purpose of load bearing requirement with
higher productivity from part production perspective.
9. The manhole cover assembly as per claim 1 and 2, wherein the plurality of pattern of inserting features and pattern of receptacle features form the geometrical shape for load distribution and transfer from Manhole cover assembly to frame.
10. The manhole cover assembly as per claim 1 and 2, wherein the plurality of pultrusion features act as a reinforcing element between pattern of inserting features and pattern of receptacle features which form the geometrical shape for load distribution and transfer from Manhole cover assembly to frame.

11. The manholes cover assembly as per claim 1 and 2, which will be able to sustain the load capacity of 2.5 Ton, 12.5 Ton, 40 Ton and 60 ton.
12. The manholes cover assembly as per claim 1 and 2, which will corrosion free product during use.

13. The manholes cover assembly as per claim 1 and 2, which will have less interference to the radio frequency.
14. The manholes cover assembly as per claim 1 and 2, which will have lightweight construction easy for installation, transportation and handling required during meter reading of Junction or utility box.