FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
As amended by the Patents (Amendment) Act, 2005
&
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2006
COMPLETE SPECIFICATION
(See section 10 and rule 13)
TITLE OF THE INVENTION
A caster wheel assembly
APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTORS
Rajgopal Desale, Vishal Bagade of Crompton Greaves Ltd, Switchgear Division, Nasik, Maharashtra, India, both Indian Nationals
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the nature of this invention and the manner in which it is to be performed:

FIELD OF THE INVENTION
The following specification particularly describes the nature of this invention and the manner in which it is to be performed:
BACKGROUND OF THE INVENTION
Heavy equipments often need to be transported or re-located within factory premises for maintenance and/or assembly and replacement of old parts and components of the equipment. It is difficult to relocate such equipments without causing unintended damage to the various components that make up the equipment. In some cases it is also necessary the relocate the equipment without causing a lot of undue vibrations. Currently forklifts and cranes are popularly used to lift and relocate such heavy equipment. However, forklifts and cranes are usually huge in size and it becomes difficult to maneuver them in a limited area and therefore the relocation of the equipment becomes difficult. Further, factory site also has over head electrical lines and the operator of the forklift or crane needs to be especially careful about them while performing the re-location. There is a need for conveniently and safely relocating heavy equipment within factory premises.
The present invention relates generally to a wheel assembly and in particular to an adjustable wheel assembly. More particularly, the present invention relates to a caster wheel assembly suitable for easy transportation and re-location of heavy duty electrical equipment for e.g. circuit breakers at a factory site. Further, the present invention relates to a caster wheel arrangement that can be used to conveniently re-locate the equipment without causing much vibration.

OBJECTS OF THE INVENTION
An object of the present invention is to provide a caster wheel assembly and a trolley using such a caster wheel assembly to allow for convenient re-location of heavy equipment.
DETAILED DESCRIPTION OF THE INVENTION
According to the invention a caster wheel assembly is disclosed that comprises of a first plate; and a second plate; and a caster wheel mounted on a wheel bracket, the wheel bracket being mounted below the second plate; the first plate and the second plate being hinged pivotally such that the second plate is rotatable with respect to the first plate between a first position and a second position; and a resilient member extending between the first plate and the second plate that can be acted upon being to radially urge the second plate between the first position and the second position.
Preferably in the proposed caster wheel assembly, the first plate and the second plate have a free end and a pivotal end; and a threaded hole is provided at the free end of the first plate and another hole provided at the free end of the second plate with the resilient member engaging the first plate and the second plate via the threaded hole in the first plate and the hole in the second plate; and a pair of hinge pin receiving members welded in a spaced apart relationship at the pivotal end of the first plate; and a rectangular block with a cylindrical hole welded at the pivotal end of the second plate; and wherein the rectangular block with the cylindrical hole is arranged between the pair of hinge pin receiving members ; and a hinge pin extending through the pair of hinge pin receiving members and the rectangular block with the cylindrical hole and thereby frictionally engaging the first plate and the second plate.
Preferably in the proposed caster wheel assembly, the resilient member is a threaded bolt.

Preferably in the proposed caster wheel assembly, in the threaded bolt is screwed and unscrewed by a pre-determined number of turns to angularly displace and angularly retract the second plate with respect to the first plate from the first position to the second position.
According to the invention a trolley for moving equipment on a pair of guided rails is disclosed that employs the caster wheel assembly as proposed by the invention. The trolley comprises of at least a first pair of caster wheel assembly as proposed earlier on a first rail of the guided rails; and at least a second pair of caster wheel assembly as proposed earlier on a second rail of the guided rails; and a first side rail welded to the first pair of caster wheel assembly; and a second side rail welded to the second pair of caster wheel assembly; and wherein the first side rail and the second side rail have a set of holes that are coincidable with a corresponding set of holes on the guided rails at destined locations where the equipment is desired to be fixed in position; and wherein the first and second pair of caster wheels assembly is operated with respective second plates being positioned in said first position to lower the equipment on the guided rails at the destined locations; and wherein the first and second pair of caster wheels assembly are operated with respective second plates being positioned in said second position to move the trolley along the guided rail.
These and other aspects, features and advantages of the invention will be better understood with reference to the following detailed description, accompanying drawings and appended claims, in which,
Figure 1 is an isometric view of a caster wheel assembly according to an embodiment of the present invention.
Figure la represents some elements of the caster wheel assembly in greater detail.

Figure 2a is a front view of the caster wheel assembly according to an embodiment of the present invention.
Figure 2b is a front view of the caster wheel assembly in which the second plate is shown angularly displaced from the first plate according to the present invention.
Figure 3a is an isometric view of a trolley that comprises of the caster wheel assembly as proposed in the present invention
Figure 3b is a close up view of a caster wheel assembly as assembled on the trolley as proposed in the present invention
Referring to Figure 1 and Figure la , the caster assembly 100 comprising of a first plate 1, a second plate 2 , caster wheel 3 mounted on wheel bracket 4 that and is firmly secured below second plate 2, threaded bolt 5, hinge pin 6 and hinge pin receiving members 7, rectangular block with a cylindrical hole 9.
Referring to Figure la, the first plate 1 and second plate 2 are aligned in a vertical axis and mounted over one another to form the caster wheel assembly 100. The first plate 1 has a free end and a pivotal end representable as 'a1 and 'b'. The second plate 2 also has a free end and a pivotal end representable as 'c' and'd'. As can be seen from Figure la, the first plate 1 has a pair of hinge pin receiving members 7 that are welded under the first plate 1 at the pivotal end 'b' in a spaced apart relationship. The first plate 1 has a hole 10 with grooves within towards its free end 'a'. The second plate 2 has a rectangular block with a cylindrical hole 9 welded at its pivotal end'd'. The second plate 2 has a hole 11 towards its free end 'c'.

The rectangular block with the cylindrical hole 9 is held within the hinge pin receiving members 7. A hinge pin 6 is locatable through the hinge pin receiving members 7 and the rectangular block with the cylindrical hole 6 that pivotally holds the first plate 1 and the second plate 2. A threaded bolt 5 can be inserted through holes 10 and 11. The threaded bolt 5 is loosely held within hole 11 in the second plate 2 within by means of a washer and a split pin (not shown) such that it can be rotated within the hole 11. The threaded bolt 5 can be screwed and unscrewed to radially extend the second plate 2 away from the first plate 1.
In Figure 2a, the caster wheel assembly 100 is shown in which the second plate 2 is shown in a first position in which it is not radially displaced away from first plate 1. In Figure 2b, the threaded bolt 5 is screwed (say clockwise) to extend the second plate 2 away from the first plate 1 to arrive at a second position. As the second plate 2 gets radially displaced from the first position to the second position downward, it causes a slight rotation of the caster wheel 3 that is freely mounted on the wheel bracket 4. From the second position of the second plate 2 as shown in Figure 2b, if the bolt 5 is unscrewed (i.e. anti clockwise), the second plate 2 is angularly retracts towards the first position as represented in Figure 2a. One may also notice that the angular displacement of second plate 2 also affects the vertical distance of the first plate 1 from the ground surface. The first plate 1 is raised or lowered by a vertical distance proportional to the angular displacement to the second plate 2 as the threaded bolt 5.is screwed or unscrewed.
Figure 3a illustrates a trolley 300 that is formed using caster wheel assemblies 101-104. The caster wheel assemblies 101-104 are firmly secured to a rail casing 60 and the trolley can be displaced along a pair guided rails 50. The heavy duty equipment that needs to be re-located may be mounted over the rail casing 60 and can be firmly secured via nut and bolt arrangement in the holes provided on the rail casing 60. Caster wheel assemblies 101 and 102 are secured to a side rail 30 while caster wheel assemblies 103 and 104 are secured to side rail 70 and the side rails 30 and 70 have holes along them.

The guided rails 50 also adjoins a fixed rail 40 for caster wheel assemblies 101 and 102 and a fixed rail 80 for caster wheel assemblies 103 and 104. The fixed rails 40 and 80 have holes along them. For the trolley 300 to move the side rails 30 and 70 need to be raised above the fixed rail 40 and 80. In order to make this possible the second plate of each of the caster wheel assemblies 101-104 is taken in to the second position by screwing the corresponding threaded bolts equally for each of the caster wheel assemblies. The caster wheel assemblies and the threaded bolts in particular are resilient and strong enough to bear the weight of the heavy duty equipment. Figure 3a illustrates a closer view of caster wheel assembly 101 on the trolley 300.
As the trolley 300 moves along the guided rails 50 the side rail 30, 70 also get displaced along. As the trolley moves along the holes on the side rails 30 and 70 can be made to coincide to the holes on the fixed rails 40 and 80. The holes on the fixed rails 40 and 80 are pre-decided according to the desired locations the equipment needs to be re-located along the guided rails 50. At the desired location where the holes on the side rails 30, 70 coincide with the holes on the fixed rail 40, 80 the second plates of corresponding caster wheel assemblies 101-104 are angularly retracted to their first positions by unscrewing the corresponding threaded bolts. As the threaded bolts are unscrewed the side rails 30, 70 of the trolley get lowered on to the fixed rail 40, 80. The side rail can be firmly secured with the fixed rail to steady the position of the trolley 300.
Although the invention has been described with reference to a specific embodiment, this description is not meant to be construed in a limiting sense. Various modifications of the disclosed embodiment, as well as alternate embodiments of the invention, will become apparent to persons skilled in the art upon reference to the description of the invention, ft is therefore contemplated that such modifications can be made without departing from the scope of the invention as defined in the appended claims.

We Claim,
1. A caster wheel assembly including:
a first plate; and
a second plate; and
a caster wheel mounted on a wheel bracket, the wheel bracket being mounted below the second
plate;
wherein the first plate and the second plate being hinged pivotally such that the second plate is
rotatable with respect to the first plate between a first position and a second position; and
a resilient member extending between the first plate and the second plate that can be acted upon being
to radially urge the second plate between the first position and the second position.
2. The caster wheel assembly of claim 1,
wherein the first plate and the second plate have a free end and a pivota) end; and wherein a threaded hole is provided at the free end of the first plate and another hole provided at the free end of the second plate with the resilient member engaging the first plate and the second plate via the threaded hole in the first plate and the hole in the second plate; and
a pair of hinge pin receiving members welded in a spaced apart relationship at the pivotal end of the first plate; and
a rectangular block with a cylindrical hole welded at the pivotal end of the second plate; and wherein the rectangular block with the cylindrical hole is arranged between the pair of hinge pin receiving members ; and
a hinge pin extending through the pair of hinge pin receiving members and the rectangular block with the cylindrical hole and thereby frictionally engaging the first plate and the second plate.
3. The caster wheel assembly of claim 2, the resilient member is a threaded bolt.

4. The caster wheel assembly of claims 1 to 3,
wherein the threaded bolt is screwed and unscrewed by a pre-determined number of turns to angularly displace and angularly retract the second plate with respect to the first plate from the first position to the second position.
5. A trolley for moving equipment on a pair of guided rails using a caster wheel assembly as claimed
in claims 1 to 4, the trolley comprising:
at least a first pair caster wheel assembly as claimed from claims 1 to 4 on a first rail of the guided
rails; and
at least a second pair of caster wheel assembly as claimed from claims 1 to 4 on a second rail of the
guided rails; and
a first side rail welded to the first pair of caster wheel assembly; and
a second side rail welded to the second pair of caster wheel assembly; and
wherein the first side rail and the second side rail have a set of holes that are coincidable with a
corresponding set of holes on the guided rails at destined locations where the equipment is desired to
be fixed in position; and
wherein the first and second pair of caster wheels assembly is operated with respective second plates
being positioned in said first position to lower the equipment on the guided rails at the destined
locations; and
wherein the first and second pair of caster wheels assembly are operated with respective second
plates being positioned in said second position to move the trolley along the guided rail.