TOOL FOR INSTALLATION OF A PLURALITY OF OIL SEALS HAVING
DIFFERENT DIAMETERS
FIELD OF INVENTION:
The present invention generally relates to a tool for installation of oil seals. More particularly, the present invention relates to a single tool for installation of a plurality of oil seals having different diameters.
BACKGROUND OF THE INVENTION:
Oil seals and grease seals are well known in the art and used in several industries. As already known, oil seals and grease seals seal the aggregates on which they are mounted to avoid loss of lubricating fluids and also prevent injection of dirt and other foreign particles. Such aggregates are well known to a person skilled in the art such as Engine, Gearbox, Rear Axle, Front Axle and the likes.
Commercially many separate installation tools are available for fitment of oil seals. However, there are certain drawbacks associated with use of separate tools for installation of different oil seals. Firstly, different aggregates require different tools which are difficult to identify. Secondly, the cost involved to buy different tools may result in incorrect installation practices wherein the installation is done with incorrect tools to save costs. Such incorrect practices lead to improper installation which results in reworks and further costs. Further, different tools occupy more space and, therefore, lead to storage problems.
Prior arts have attempted to solve the above-mentioned problems by disclosing single tool for installation of oil seals of different diameters. However, said single tools suffer from drawbacks of axial extension with unproductive tools, are complicated and too bulky to use. Prior art US4291451 includes a plurality of frusto-conical sections, each section being

especially adapted to be releasably retained on a member to which an O-ring is to be fitted. The sections also interfit so that they can be assembled in end-to-end relationship. The drawback associated with said prior art is that of axial stacking wherein a frusto-conical section with smaller diameter cannot be used without the frusto-conical section having larger diameters. This makes the tool bulky and cumbersome to work with while installation of seals having smaller diameters.
Another prior art US7096551B2 discloses a tool having a cup member and a driving handle at the top thereof. Various sizes of a seal installing member are provided and all have the same upper cylindrical portion with the lower cylindrical portion being of various sizes. The said tool also poses the above-mentioned drawbacks. This tool is axially extending with three unproductive tools and a main tool for installation. The said tool is also complicated as every fitment of oil seals needs change in tool.
Accordingly, there is a need for an improved single tool for installation of oil seals of different diameters which overcomes the above-mentioned disadvantages and is also simple, reliable and cost effective.
OBJECTS OF THE INVENTION:
One object of the present invention is to provide a single tool for installation of a plurality of oil seals having different diameters.
Another object of the present invention is to provide a single tool which is ergonomically designed for easy and error free installation.
Yet another object of the present invention is to provide a single tool which occupies less storage space.

Yet another object of the present invention is to avoid axial extension of tool by avoiding fitment of un-productive tools during installation.
Yet another object of the present invention is to reduce cost of tool procurement. This makes a service person buy one tool which can be used for many different aggregates, as a result of using the special tool, rework is avoided, hence savings in time and money involved for rework.
These and other objects as well as advantages will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings and claims.
SUMMARY OF THE INVENTION:
In accordance with the purposes of the invention, the present invention as embodied and broadly described herein, provides a tool for installation of a plurality of oil seals having different diameters.
In one embodiment, the tool comprises a base tool, one or more first child tool and one or more second child tools. The base tool has a first end, a second end and a section extending therebetween. The second end of the base tool has protruding members. The section of the base tool has stepped cylindrical portions of different diameters on which oil seals of different diameters can be mounted for fitment /installation on different aggregates. The first child tool has a first end, a second end and a section extending therebetween. The said first child tool has a recess extending wholly or partially from the first end to the second end such that said first tool can be slidably mounted along a lengthwise portion of one of the cylindrical portions of the base tool. The section of the first child tool is made of stepped cylindrical portions of different diameters on which oil seals are mounted for fitment/installation of oils seals on different aggregates. Each of the second child tool has a first end, a second end and a section therebetween. The first end of each of said second

child tool comprises receiving members to releasably engage with the protruding members of the base tool. The advantage of such a construction is that each of the second child members can independently engage with the base tool for fitment/installation of oil seals on different aggregates. Such a construction avoids fitment of un-productive tools during installation. Also, the section of each of the child tool is made of stepped cylindrical portions of different diameters on which oil seals are mounted for fitment/installation on different aggregates.
In another embodiment, the tool comprises a base tool, one or more first child tool and one or more second child tools. The base tool has a first end, a second end and a section extending therebetween. The second end of the base tool has receiving members. The section of the base tool has stepped cylindrical portions of different diameters on which oil seals of different diameters can be mounted for fitment /installation on different aggregates. The first child tool has a first end, a second end and a section extending therebetween. The said first child tool has a recess extending wholly or partially from the first end to the second end such that said first tool can be slidably mounted along a lengthwise portion of one of the cylindrical portions of the base tool. The section of the first child tool is made of stepped cylindrical portions of different diameters on which oil seals can be mounted for fitment/installation of oils seals on different aggregates. Each of the second child tools has a first end, a second end and a section therebetween. The first end of each of said second child tools comprises protruding members to releasably engage with the receiving members of the base tool. The advantage of such a construction is that each of the second child members can independently engage with the base tool for fitment/installation of oil seals on different aggregates. Such a construction avoids fitment of un-productive tools during installation. Also, the section of each of the child tool is made of stepped cylindrical portions of different diameters on which oil seals are mounted for fitment/installation on different aggregates.
In yet another embodiment, the tool comprises a base tool and one or more child tools. The base tool has a first end, a second end and a section extending therebetween. The second

end of the base tool has protruding members. The section of the base tool has stepped cylindrical portions of different diameters on which oil seals of different diameters can be mounted for fitment /installation on different aggregates. Each of the child tools has a first end, a second end and a section therebetween. The first end of each of said second child tools comprises receiving members to releasably engage with the protruding members of the base tool. The advantage of such a construction is that each of the child tools can independently engage with the base tool for fitment/installation of oil seals on different aggregates. Such a construction avoids fitment of un-productive tools during installation. Also, the section of each of the child tool is made of stepped cylindrical portions of different diameters on which oil seals are mounted for fitment/installation on different aggregates.
These and other aspects as well as advantages will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings and claims.
BRIEF DESCRIPTION OF DRAWINGS
To further clarify advantages and aspects of the invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof, which is illustrated in the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. The invention will be described and explained with additional specificity and detail with the accompanying drawings, which are listed below for quick reference.
Figure 1(a) illustrates an isometric view of the tool 100 of the present invention, in accordance with one embodiment. Figure 1(b) illustrates the side view of the tool 100 shown in Figure 1 (a). Figure 1(c) illustrates section A-A of the side view of the tool 100 illustrated in Figure 1(b).
6

Figure 2(a) illustrates the side view of the tool 200 of the present invention, in accordance with another embodiment of the present invention. Figure 2(b) illustrates section A-A of the side view of the tool 200 illustrated in Figure 2(a).
Figure 3(a) illustrates the side view of the tool 300 of the present invention, in accordance with another embodiment of the present invention. Figure 3(b) illustrates section A-A of the side view of the tool 300 illustrated in Figure 3(a).
The person ordinary skill in the art will appreciate that elements in the drawings are illustrated for simplicity and may not have been necessarily drawn to scale. For example, the dimensions of some of the elements in the drawings may be exaggerated relative to other elements to help to improve understanding of aspects of the invention. Furthermore, the one or more elements may have been represented in the drawings by conventional symbols, and the drawings may show only those specific details that are pertinent to understanding the embodiments of the invention so as not to obscure the drawings with details that will be readily apparent to those of ordinary skill in the art having benefit of the description herein.
DETAILED DESCRIPTION
It should be understood at the outset that although illustrative implementations of the embodiments of the present disclosure are illustrated below, the present invention may be implemented using any number of techniques, whether currently known or in existence. The present disclosure should in no way be limited to the illustrative implementations, drawings, and techniques illustrated below, including the exemplary design and implementation illustrated and described herein, but may be modified within the scope of the appended claims along with their full scope of equivalents.
The term "some" as used herein is defined as "none, or one, or more than one, or all ." Accordingly, the terms "none," "one," "more than one," "more than one, but not all" or

"all" would all fall under the definition of "some." The term "some embodiments" may refer to no embodiments or to one embodiment or to several embodiments or to all embodiments. Accordingly, the term "some embodiments" is defined as meaning "no embodiment, or one embodiment, or more than one embodiment, or all embodiments."
The terminology and structure employed herein is for describing, teaching and illuminating some embodiments and their specific features and elements and does not limit, restrict or reduce the spirit and scope of the claims or their equivalents.
More specifically, any terms used herein such as but not limited to "includes," "comprises," "has," "consists," and grammatical variants thereof do NOT specify an exact limitation or restriction and certainly do NOT exclude the possible addition of one or more features or elements, unless otherwise stated, and furthermore must NOT be taken to exclude the possible removal of one or more of the listed features and elements, unless otherwise stated with the limiting language "MUST comprise" or "NEEDS TO include."
Whether or not a certain feature or element was limited to being used only once, either way it may still be referred to as "one or more features" or "one or more elements" or "at least one feature" or "at least one element." Furthermore, the use of the terms "one or more" or "at least one" feature or element do NOT preclude there being none of that feature or element, unless otherwise specified by limiting language such as "there NEEDS to be one or more ..." or "one or more element is REQUIRED."
Unless otherwise defined, all terms, and especially any technical and/or scientific terms, used herein may be taken to have the same meaning as commonly understood by one having an ordinary skill in the art.
Reference is made herein to some "embodiments." It should be understood that an embodiment is an example of a possible implementation of any features and/or elements presented in the attached claims. Some embodiments have been described for the purpose

of illuminating one or more of the potential ways in which the specific features and/or elements of the attached claims fulfill the requirements of uniqueness, utility and non-obviousness.
Use of the phrases and/or terms such as but not limited to "a first embodiment," "a further embodiment," "an alternate embodiment," "one embodiment," "an embodiment," "multiple embodiments," "some embodiments," "other embodiments," "further embodiment", "furthermore embodiment", "additional embodiment" or variants thereof do NOT necessarily refer to the same embodiments. Unless otherwise specified, one or more particular features and/or elements described in connection with one or more embodiments may be found in one embodiment, or may be found in more than one embodiment, or may be found in all embodiments, or may be found in no embodiments. Although one or more features and/or elements may be described herein in the context of only a single embodiment, or alternatively in the context of more than one embodiment, or further alternatively in the context of all embodiments, the features and/or elements may instead be provided separately or in any appropriate combination or not at all. Conversely, any features and/or elements described in the context of separate embodiments may alternatively be realized as existing together in the context of a single embodiment.
Any particular and all details set forth herein are used in the context of some embodiments and therefore should NOT be necessarily taken as limiting factors to the attached claims. The attached claims and their legal equivalents can be realized in the context of embodiments other than the ones used as illustrative examples in the description below.
Figure 1(a) illustrates an isometric view of the tool 100 of the present invention, in accordance with one embodiment. Figure 1(b) illustrates the side view of the tool 100 shown in Figure 1 (a). Figure 1(c) illustrates section A-A of the side view of the tool 100 illustrated in Figure 1(b).

The said tool 100 comprises a base tool 101, one or more first child tools 102 and one or more second child tools 103. For the sake of clarity, Figure 1 represents only one first child tool 102 and two second child tools 103. However, said Figure 1 should not construed as limiting and the tool of the present invention can comprise one or more first child tools and one or more second child tools.
As shown, the base tool 101 comprises a first end 104, a second end 105 and a section 106 extending between said first end 104 and said second end 105. The base tool 101 can be made solid or hollow depending on the weight considerations of the base tool 101. The base tool 101 is made hollow by forming a cylindrical bore 107 that runs partially or wholly through the section 106 of said base tool 101.
The base tool 101 further comprises protruding members 108 extending axially outwardly from said second end 105 of said base tool 104. In one example, the base tool comprises two protruding members located opposite each other at a radial distance from the longitudinal axis X-X of the base tool. In another example, the base tool comprises multiple protruding members located at a radial distance from the longitudinal axis X-X of the base tool and are located equidistant from each other.
In one example, the protruding members 108 are made integral with the base tool 101 and protrude from said second end 105 of the base tool 101. In another example, the protruding members 108 are fixedly attached to the said second end 105 of the base tool 101. Examples of protruding members 108 may include, being not limited to, dowel pins, tabs, extruded material, etc.
Further, the section 106 of the base tool 101 is made of stepped cylindrical portions 109 of different diameters. The diameters of the stepped cylindrical portions 109 decrease towards the second end 105 of the base tool 101. In other words, the cylindrical portion proximate to the first end of the base tool will have larger diameter than the cylindrical

portion proximate of the second end of the base tool. Oil seals of different diameters can be mounted on said cylindrical portions.
The main advantage of the base tool 101 in the present invention is that the base tool 101 is not an un-productive tool but can be used for installation of oil seals of various diameters. The stepped cylindrical portions having different diameters may be achieved by methods known to a person ordinarily skilled in the art such as machining, casting, forging, assembling and the likes.
The first child tool 102 also comprises a first end 110, a second end 111 and a section 112 extending between said first end 110 and said second end 111. The first child tool 102 further comprises a recess 113 which extends either partially or wholly from the first end 110 to the second end 111 of said first child tool 102. The dimensions of recess 113 are such that said first child tool 102 can being slidably mounted along a lengthwise portion of one of the cylindrical portions 109 of the base tool 101. The advantage of such a construction is that it overcomes the problem of axial extension/ stacking as the first child tool 102 is mounted on the base tool 101 and there is no variation in the length of the tool
100 while installation of oil seals mounted on the first child tool 102. This leads to an ergonomic design. Also, the mounting of the first child tool 102 directly on the base tool
101 reduces the space required for storage of said first child tool 102.
Oil seals of different size can also be mounted on the first child tool 102 owing to the construction of said first child tool 102. The section 112 extending between said first end 110 and said second end 111 is made of stepped cylindrical portions 114 of different diameters. The diameters of the stepped cylindrical portions decrease towards the second end of the first child tool. In other words, the cylindrical portion proximate to the first end of the first child tool will have larger diameter than the cylindrical portion proximate of the second end of the first child tool. Oil seals of different diameters can be mounted on said cylindrical portions. The stepped cylindrical portions of different diameters may be

achieved by methods known to a person ordinarily skilled in the art such as machining, casting, forging, assembling and the likes.
The second child tool 103 also comprises a first end 115, a second end 116 and a section 117 extending therebetween. The second child tool 103 further comprises receiving members 118 adapted to releasably engage with the protruding members 108 of the base tool 101. The receiving members 118 are formed on the first end 115 of the second child tool 103. In one example, the receiving members 118 are recesses adapted to engage the protruding members 108 of the base tool 101. It is to be understood that the dimension, location and number of such recesses depend on the dimension, location and number of protruding members located on the second end of the base tool.
The advantage of providing receiving members 118 on each of the second child tool is that each of the child tools 103 can independently engage with the base tool 101. Also, the second end 116 of each second child tool 103 comprises protruding means (not shown) which can releasably engage with the receiving members 118 of another second child tool. Owing to provision of protruding members on second end 116 of each of the second child tool 103, a plurality of second child tools 103 can be attached to the base tool, if required. In other words, a plurality of the second child tools 103 can be stacked together and attached to the base tool, if required.
Oil seals of different size can also be mounted on the second child tool 103 owing to the construction of said second child tool. The section 117 extending between said first end 115 and said second end 116 is made of stepped cylindrical portions 119 of different diameters. The diameters of the stepped cylindrical portions decrease towards the second end of the second child tool. Oil seals of different diameters can be mounted on said cylindrical portions. The stepped cylindrical portions of different diameters may be achieved by methods known to a person ordinarily skilled in the art such as machining, casting, forging, assembling and the likes.

It is to be understood that the cylindrical portions (109, 114, 119) of each of the base tool, first child tool and second child tool have different diameters such that oil seals of different diameters can be mounted on said base tool, first child tool and second child tool.
It is to be further understood that the material for base tools and child tool can be selected from suitable material already known in the art. The suitable material may include polymer and steel. However, such materials should not be construed as limiting and the tool 100 of the present invention may be formed of materials already known to a person skilled in the art.
In one example, the tool 100 is designed to install 10 seals of different diameters. The said tool comprises one base tool, one first child tool and two second child tools. The base tool is designed to install three oils seals of diameters such as rear end cover oil seal on flange side of ZF9 speed gearbox, rear oil seal in ZF 6 speed gearbox and oil seal in timing cover casing of Ashok Leyland H series Engines (3). The first child tool is designed to install flywheel housing oil seal in H series Engine for service level of 6mm and oil seal installation at production level of 4mm. One second child tool is used for installation of input shaft cover oil seal in ZF 9 Speed gearbox and selector housing oil seal of ZF 6 speed gearbox. Addition of bush in said second child tool allows installation of oil seal in axle arm of front axle. Another, second child tool is used for installation of oil seal in front bearing cover and rear bearing cover of Eaton 6 speed gearbox.
Figure 2(a) illustrates the side view of the tool 200 of the present invention, in accordance with another embodiment of the present invention. Figure 2(b) illustrates section A-A of the side view of the tool 200 illustrated in Figure 2(a).
The said tool 200 comprises a base tool 201, one or more first child tools 202 and one or more second child tools 203. For the sake of clarity, Figure 2 represents only one first child tool 202 and two second child tools 203. However, said Figure should not be

construed as limiting and the tool of the present invention can comprises one or more first child tools and one or more second child tools.
As shown, the base tool 201 comprises a first end 204, a second end 205 and a section 206 extending between said first end 204 and said second end 205. The base tool 201 can be made solid or hollow depending on the weight considerations of the base tool 201. The base tool 201 is made hollow by forming a cylindrical bore 207 that runs partially or wholly through the section 206 of said base tool 201. The base tool 201 further comprises receiving members 208 such as recesses provided on the second end 205 of said base tool 201.
Further, the section 206 of the base tool 201 is made of stepped cylindrical portions 209 of different diameters. The diameters of the stepped cylindrical portions 209 decrease towards the second end 205 of the base tool 201. In other words, the cylindrical portion proximate to the first end of the base tool will have larger diameter than the cylindrical portion proximate of the second end of the base tool. Oil seals of different diameters can be mounted on said cylindrical portions.
The main advantage of the base tool 201 in the present invention is that the base tool 201 is not an un-productive tool but can be used for installation of oil seals of various diameters. The stepped cylindrical portions of different diameters may be achieved by methods known to a person ordinarily skilled in the art such as machining, casting, forging, assembling and the likes.
The first child tool 202 also comprises a first end 210, a second end 211 and a section 212 extending between said first end 210 and said second end 211. The first child tool 202 further comprises a recess 213 which extends either partially or wholly from the first end 210 to the second end 211 of said first child tool 202. The dimensions of recess 213 are such that said first child tool 202 can being slidably mounted along a lengthwise portion of one of the cylindrical portions 209 of the base tool 201. In other words, the

cylindrical portion proximate to the first end of the first child tool will have larger diameter than the cylindrical portion proximate of the second end of the first child tool.
The advantage of such a construction is that it overcomes the problem of axial extension/ stacking as the first child tool 202 is mounted on the base tool 201 and there is no variation in the length of the tool 200 while installation of oil seals mounted on the first child tool 202. This leads to an ergonomic design. Also, the mounting of the first child tool 202 directly on the base tool 101 reduces the space required for storage of said first child tool 202.
Oil seals of different size can also be mounted on the first child tool 202 owing to the construction of said first child tool 202. The section 212 extending between said first end 210 and said second end 211 is made of stepped cylindrical portions 214 of different diameters. The stepped cylindrical portions of different diameters may be achieved by methods known to a person ordinarily skilled in the art such as machining, casting, forging, assembling and the likes.
The second child tool 203 also comprises a first end 215, a second end 216 and a section 217 extending therebetween. The second child tool 203 further comprises protruding members 218 extending axially outwardly from said first end 215 of said second child tool. In one example, the protruding members 218 are made integral with the second child tool and protrude from said first end 216 of the second child tool 01. In another example, the protruding members 218 may be fixedly attached to the said first end 216 of the second child tool 203. Examples of protruding members 218 may include, being not limited to, dowel pins, tabs, extruded material, etc.
The advantage of providing protruding members 218 on each of the second child tool is that each of the child tools 203 can independently engage with the base tool 201. Also, the second end 216 of each second child tool 203 comprises receiving members (not shown) which can releasably engage with the protruding members 218 of another second

child tool. Owing to provision of receiving members on second end 216 of each of the second child tool 203, a plurality of second child tools 203 can be attached to the base tool, if required. In other words, a plurality of the second child tools 103 can be stacked together and attached to the base tool, if required.
Oil seals of different size can also be mounted on the second child tool 203 owing to the construction of said second child tool. The section 217 extending between said first end 215 and said second end 216 is made of stepped cylindrical portions 219 of different diameters. The stepped cylindrical portions of different diameters may be achieved by methods known to a person ordinarily skilled in the art such as machining, casting, forging, assembling and the likes.
It is to be understood that the cylindrical portions (209, 214, 219) of each of the base tool, first child tool and second child tool have different diameters such that oil seals of different diameters can be mounted on said base tool, first child tool and second child tool.
It is to be further understood that the material for base tools and child tools can be selected from suitable material already known in the art. The suitable material may include polymer and steel.
Figure 3(a) illustrates the side view of the tool 300 of the present invention, in accordance with another embodiment of the present invention. Figure 3(b) illustrates section A-A of the side view of the tool 300 illustrated in Figure 3(a).
The said tool 300 comprises a base tool 301 and one or more child tools 303. For the sake of clarity, Figure 3 represents only two child tools 303. However, said Figure 3 should not be construed as limiting and the tool of the present invention can comprises one or more child tools.

As shown, the base tool 301 comprises a first end 304, a second end 305 and a section 306 extending between said first end 304 and said second end 305. The base tool 301 can be made solid or hollow depending on the weight considerations of the base tool 301. The base tool 301 is made hollow by forming a cylindrical bore 307 that runs partially or wholly through the section 306 of said base tool 301.
The base tool 301 further comprises protruding members 308 extending axially outwardly from said second end 305 of said base tool 304. In one example, the protruding members 308 are made integral with the base tool 301 and protrude from said second end 305 of the base tool 301. In another example, the protruding members 308 may be fixedly attached to the said second end 305 of the base tool 301. Examples of protruding members
308 may include, being not limited to, dowel pins, tabs, extruded material, etc.
Further, the section 306 of the base tool 301 is made of stepped cylindrical portions
309 of different diameters. The diameters of the stepped cylindrical portions 309 decrease
towards the second end 305 of the base tool 301. In other words, the cylindrical portion
proximate to the first end of the base tool will have larger diameter than the cylindrical
portion proximate of the second end of the base tool. Oil seals of different diameters can be
mounted on said cylindrical portions.
The main advantage of the base tool 301 in the present invention is that the base tool 301 is not an un-productive tool but can be used for installation of oil seals of various diameters. The stepped cylindrical portions of different diameters may be achieved by methods known to a person ordinarily skilled in the art such as machining, casting, forging, assembling and the likes.
The child tool 303 also comprises a first end 315, a second end 316 and a section 317 extending therebetween. The child tool 303 further comprises receiving members 318 adapted to releasably engage with the protruding members 308 of the base tool 301. The receiving members 318 are formed on the first end 315 of the child tool 303. In one

example, the receiving members 318 are recesses adapted to engage the protruding members 308 formed in the second end 305 of the base tool 301. The advantage of providing receiving members 318 on each of the child tool is that each of the child tools 303 can independently engage with the base tool 301. Also, the second end 316 of each child tool 303 comprises protruding means (not shown) which can releasably engage with the receiving members 318 of another child tool. Owing to provision of protruding members on second end 316 of each of the child tool 303, a plurality of child tools 303 can be attached to the base tool, if required. In other words, a plurality of the child tools 303 can be stacked together and attached to the base tool, if required. Oil seals of different size can also be mounted on the child tool 303 owing to the construction of said child tools. The section 317 extending between said first end 315 and said second end 316 is made of stepped cylindrical portions 319 of different diameters. The stepped cylindrical portions of different diameters may be achieved by methods known to a person ordinarily skilled in the art such as machining, casting, forging, assembling and the likes.
It is to be understood that the cylindrical portions (309, 319) of each of the base tool, child tool have different diameters such that oil seals of different diameters can be mounted on said base tool and child tool.
It is to be further understood that the material for base tools and child tool can be selected from suitable material already known in the art. The suitable material may include polymer and steel.
It is also further to be understood that the tool 300 can alternatively have receiving members on the second end 305 of the base tool, protruding members on the first end of the child tool 315 and receiving members on the second end 316 of the child tool.
While certain present preferred embodiments of the invention have been illustrated and described herein, it is to be understood that the invention is not limited thereto. Clearly, the

invention may be otherwise variously embodied, and practiced within the scope of the following claims.

We Claim:
1. A tool for installation of a plurality of oil seals having different diameters, said tool
comprising:
- a base tool having a first end, a second end and a section therebetween, said second
end of the base tool having protruding members and said section of the base tool having stepped cylindrical portions of different diameters on which oil seals are mounted for fitment/installation on different aggregates
- one or more first child tool having a first end, a second end and a section
therebetween, said first child tool having a recess capable of being slidably mounted along a lengthwise portion of one of the cylindrical portions of the base tool and said section of the first child tool having stepped cylindrical portions of different diameters on which oil seals are mounted for fitment/installation on different aggregates;
- one or more second child tools having a first end, a second end and a section
therebetween, said first end of each second child tool having receiving members to releasably engage with the protruding members of the base tool such that each second child tool can be independently mounted onto the base tool and said section of each second child tool having stepped cylindrical portions of different diameters on which oil seals are mounted for fitment/installation on different aggregates.
2. The tool as claimed in claim 1, wherein the second end of each child tool comprises protruding members to releasably engage with the receiving members located on the first end of another child tool such that the child tools can be stacked together.
3. The tool as claimed in claim 1, wherein the recess extends from the first end of the first child tool either partially or wholly through the section of said first child tool.
4. The tool as claimed in claim 1, wherein cylindrical portions of the base tool, the first child tool and each of the second child tools have different diameters.
5. The tool is claimed in claim 1, wherein the base tool and child tools are made of material selected from a group comprising:

- polymer; and
- steel.
6. The tool is claimed in claim 1, wherein the base tool has a cylindrical bore running
through the section from the first end to the second end.

7. The tool as claimed in claim 1, wherein the protruding members located on the second end of the base tool are dowel pins and the receiving members on the first end of the each of the child tools are recesses.
8. A tool for installation of a plurality of oil seals having different diameters, said tool comprising:
- a base tool having a first end, a second end and a section therebetween, said second
end of the base tool having receiving members and said section of the base tool having stepped cylindrical portions of different diameters on which oil seals are mounted for fitment/installation on different aggregates
- one or more first child tool having a first end, a second end and a section
therebetween, said first child tool having a recessed portion capable of being slidably mounted along a lengthwise portion of one of the cylindrical portions of the base tool and said section of the first child tool having stepped cylindrical portions of different diameters on which oil seals are mounted for fitment/installation on different aggregates;
- one or more second child tools having a first end, a second end and a section
therebetween, said first end of each second child tool having protruding members to releasably engage with the receiving members of the base tool such that each second child tool can be independently mounted onto the base tool and said section of each second child tool having stepped cylindrical portions of different diameters on which oil seals are mounted for fitment/installation on different aggregates.
9. The tool as claimed in claim 1, wherein the second end of each child tool comprises receiving members to releasably engage with the protruding members located on the first end of another child tool such that the child tools can be stacked together.
10. A tool for installation of a plurality of oil seals having different diameters, said tool comprising:
- a base tool having a first end, a second end and a section therebetween, said second
end of the base tool having protruding members and said section of the base tool having stepped cylindrical portions of different diameters on which oil seals are mounted for fitment/installation on different aggregates
- one or more child tools having a first end, a second end and a section therebetween,
said first end having receiving members to releasably engage with the protruding members of the base tool such that each child tool can be independently mounted onto the base tool and said section of each child tool having stepped cylindrical portions of different diameters on which oil seals are mounted for fitment/installation on different aggregates.