FORM – 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
Title:
TURN-CIRCLE ASSEMBLY FOR A MINI GRADER
Applicant:
MAHINDRA & MAHINDRA LIMITED
GATEWAY BUILDING, APOLLO BUNDER,
MUMBAI – 400001,
MAHARASHTRA, INDIA.
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED. 2

FIELD OF INVENTION
The present invention relates to construction equipment used in civil engineering. In particular, the present invention relates to a mini-grader used for grading of roads and earthworks. More particularly, the present invention relates to a turn-circle for a mini-grader.
BACKGROUND OF THE INVENTION
Grading operation in civil engineering and landscape architectural construction is performed for ensuring a level base, or a base having a specified slope for subsequently constructing, e.g. the foundation, the base course for roads or railways, or for improving the landscapes and/or gardens, or surface drainage. Such earthworks developed for these purposes are normally called as sub-grade or finished contouring. In the case of certain gravel roads and earthworks, the “grading” forms not only includes the base but also involves the cover and surface of the finished construction, and is often called as “finished grade”. It is often performed by using heavy machinery, such as bulldozers and excavators to first roughly prepare an area and subsequently, by using a grader for obtaining a finer finish.
Therefore, the graders are normally used in civil engineering as construction equipment for the purpose of "finish grading" (refining or setting precisely) operations. Whereas, the "rough grading" operation is performed by heavy equipment or engineering vehicles such as scrapers and bulldozers.
These graders are commonly used in the construction and maintenance of dirt roads and gravel roads. In the construction of paved roads, these graders are used to prepare the base course to create a wide flat surface for placing asphalt thereon. In addition, the graders are also used to set native soil foundation pads for finish grading before commencement of the construction of large buildings. The graders can produce inclined surfaces for providing cant or camber to roads. These graders are also used for producing drainage ditches with shallow V-shaped cross-sections on either side of highways in some countries.
Therefore, a grader is commonly also referred to as a road grader, a blade, a maintainer, or a motor grader, and it is a construction machine with a long blade used to create a flat surface during the grading process. 3

Some grader models have three axles, having the engine and cab located above the rear axles at one end of the vehicle and a third axle at the front end of the vehicle, with the blade in between.
In certain countries, almost every grader is equipped with a second blade placed in front of the front axle. The entire machine is also referred to as "the blade". The capacity of the graders is usually in the range of the blade widths of 2.50 to 7.30 m and engines are in the range of 93 to 373 kW (125–500 horsepower). Some graders operate multiple attachments, or can be used for operations like underground mining.
US 4161987A discloses a tractor grader in which the tractor is lengthened by forwardly spacing the front wheels and having a grader blade mounted between the front and rear wheels. The blade is mounted on a lower turntable and supported adjacent an upper turntable plate by rollers engaging the lower turntable and supported by the upper plate of the turntable. The turntable plate is mounted on a frame universally pivoted at its forward end to the elongated chassis and at its rear by a pair of spaced lift rams.
However, one end of the hydraulic cylinder is mounted on a fixed chassis and the other end is mounted on the lower plate of the turntable, while an extended bracket mounting the cylinder carries a roller rolling on the upper plate of the turntable also mounted on the fixed chassis. Therefore, the disadvantages of this tractor grader are as indicated below:
1. Turntable cannot tilt in a horizontal plane and always remains parallel (or at a predefined angle) with respect to the horizontal plate, because one end of the hydraulic cylinder is fixed on the chassis;

2. Mounting the other end of the hydraulic cylinder with a complex roller arrangement is substantially costlier; and

3. The document does not disclose or describe any wear pad arrangement.

US 3015174A discloses in a motor grader, the combination of a wheeled chassis having an upwardly offset and forwardly projecting cantilevered crane arm, a push-pull frame disposed below said crane arm and directly pivoted at its rear-end to said chassis for raising and lowering movement only, a forwardly extending shaft secured to the front end of said push-pull frame, a tubular sleeve rotatably positioned on said shaft, means on the shaft preventing longitudinal movement of said sleeve, a first turntable member secured to said sleeve for tilting movement about the axis of said shaft, a second 4

turntable member rotatably connected to the first turntable member for turning movement about an axis perpendicular to said shaft, a scraper blade carried by said second turntable member, a releasable means for locking said second turntable member against rotation relative to the first turntable member, and a pair of hydraulic cylinders mounted at opposite sides of the front end portion of said crane arm, said cylinders including piston rods operatively connected to opposite side portions of said first turntable member whereby to selectively tilt the latter about the axis of said shaft and raise and lower the same about the pivotal connection of said push-pull frame to said chassis and a valve in the driver’s compartment of the motor grader for controlling said cylinders.
However, this document also does not disclose or describe any wear pad arrangement.
US4340119A discloses a new blade positioning apparatus for use in motor graders, that provides improved visibility and allows the operator to easily control the elevation, transverse inclination, and position of the scraper blade beneath the machine. The device comprises a transverse "W" shaped beam pivotally mounted to the upper surface of the support frame of the grader to allow partial rotation of the beam about the main frame. A link member passes beneath the frame of the grader and is secured to the beam member, such that the beam and link members encircle the frame. The link member cooperates with a releasable lock mechanism for securing the beam member at selected adjusted positions relative to the support frame. According to a preferred aspect of the invention, the lock mechanism includes a bar lock pivoted at one end beneath the frame of the grader and is received in tapered notches provided in the link. An over-center locking linkage arrangement is provided for moving the free end of the bar lock from a locked position to a free position for adjusting of the beam relative to the frame.
However, this document also does not disclose or describe any wear pad arrangement.
OBJECTS OF THE INVENTION
Some of the objects of the present invention - satisfied by at least one embodiment of the present invention - are as follows:
An object of the present invention is to provide a turn circle assembly for a mini grader. 5

Another object of the present invention is to provide a turn circle assembly for a mini grader which can make angles with horizontal as well as vertical plane.
Still another object of the present invention is to provide a turn circle assembly for a mini grader which is simple to manufacture.
Yet another object of the present invention is to provide a turn circle assembly for a mini grader which requires substantially less precision wear pads for manufacturing the components thereof.
A further object of the present invention is to provide a turn circle assembly for a mini grader, in which a light-weight wear pad mechanism replaces a much heavier conventional turn-center ring gear arrangement.
A still further object of the present invention is to provide a turn circle assembly for a mini grader, which includes less number of components in the wear pad mechanism.
A yet further object of the present invention is to provide a turn circle assembly for a mini grader, in which it is easy to lubricate and maintain wear pad mechanism.
One more object of the present invention is to limit the turntable rotation, which is required in 90% of mini grader applications, thus to reduce the overall cost thereof.
These and other objects and advantages of the present invention will become more apparent from the following description, when read with the accompanying figures of drawing, which are however not intended to limit the scope of the present invention in any way.
DESCRIPTION OF THE INVENTION
The turn circle for the mini grader configured in accordance with the present invention includes a very simple and easy to use wear pad arrangement. Unlike currently available turn circles, this configuration is low-cost because of the use of replacing the hydraulic motor by the hydraulic cylinders. It does not require a ring gear and transmission arrangement. Because of its excellent cost-effectiveness, the turn circle configured according to the present invention is very suitable for mini grader, particularly in Indian perspective, where low-skill users are prevalent in the operations of the mini graders. 6

SUMMARY OF THE INVENTION
In accordance with the present invention, there is provided a turn-circle assembly for a mini grader, wherein the assembly comprises a draw bar assembly and a turntable assembly and a wear pad assembly disposed between the draw bar assembly and the turntable assembly for avoiding contact between different components to reduce wear thereof.
Typically, the assembly comprises a pair of wear pads disposed between the draw bar assembly and turntable assembly and fastened along the longitudinal axis of the draw bar assembly and a center ring assembly supporting the pair of wear pads is fixed between the draw bar plate and the turntable plate; wherein the center ring assembly includes:
- a center ring consisting of a circular upwardly projection configured with a reduced diameter;

- a top center ring for the wear pad assembly;

- a bottom center ring for the wear pad assembly; and

- a radial center ring for the wear pad assembly disposed between the draw bar plate and the turntable plate;

wherein the radial center ring is configured with a lower thin plate having a larger diameter and which is configured with a concentric thick annular projection.
Typically, the top center ring prevents a direct contact of the bottom face of the draw bar plate with the upper face of the turntable plate.
Typically, each wear pad is inserted into a pocket configured in the draw bar plate and completely supported on the top center ring.
Typically, the bottom center ring prevents direct contact of bottom face of the turntable plate from the center ring.
Typically, the bottom center ring is inserted between the lower face of the turntable plate and the thin outer periphery of the center ring. 7

Typically, the radial center ring prevents a direct contact of the circular upwardly projection of the center ring from the turntable plate.
Typically, the radial center ring is disposed between the inner diameter of central aperture in the turntable plate and the outer diameter of the circular upwardly projection of the center ring.
Typically, the turntable plate comprises a circular aperture for seating the circular upwardly projection of the center ring from below.
Typically, the circular upwardly projection of the center ring is configured with a plurality of threaded holes for fastening a respective fastener.
Typically, the draw bar plate is configured with matching plurality of holes for tightening respective fasteners for making the turn circle assembly by assembling the draw bar plate and the turntable plate fitted with the wear pad assemblies disposed therebetween.
Typically, the top center rings and the bottom center rings for the wear pad assemblies are configured with grease holes acting as greasing pockets to store the grease for lubrication in order to reduce the greasing frequency of the turn circle assembly.
Typically, the material of the wear pads is nylon or bronze or any other similar material.
In accordance with the present invention, there is also provided a method for assembling the turn circle. The method comprises the following assembly steps:
• Placing the bottom center ring concentrically on the circular upwardly projection of the center ring;

• Placing the radial center ring between the inner diameter of the bottom center ring and the outer diameter of the circular upwardly projection of the center ring;
• Inserting the assembly of center ring, bottom center ring and the radial center ring obtained in previous step from below the turntable plate in the circular aperture configured therein;

• Placing the top center ring above the turntable plate along the longitudinal axis of the draw bar plate and disposed exactly above the respective bottom center ring;
8

• Inserting wear pads in the circular pockets configured along the longitudinal axis of the draw bar plate from the lower face of the draw bar plate;

• Placing the assembly of the wear pads with the draw bar plate formed in the previous step above the turntable plate by aligning the holes in the draw bar plate and the circular upwardly projection of the center ring; and

• Tightening respective fasteners in the draw bar plate with the wear pad assembly for assembling the draw bar plate and turntable plate to obtain the turn circle assembly.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The present invention will be briefly described in the following with reference to the accompanying drawings.
Figure 1a shows a side view of the conventional motor grader having a turn circle including a turntable assembly, a draw bar assembly, and a mechanism to avoid wear between the turntable assembly and the draw bar assembly.
Figure 1b shows a top view of the conventional motor grader shown in Figure 1a.
Figure 2 shows a detailed view of the conventional turn circle of a motor grader shown in Figure 1.
Figure 3a shows a perspective view of the turn circle of the conventional motor grader of Figure 2.
Figure 3b shows a perspective view of the draw bar of the conventional motor grader of Figure 2.
Figure 4 shows an enlarged perspective view of the conventional wear inserts fitted on the turn circle shown in Figure 2.
Figure 5 shows an exploded perspective view of the turn-circle configured in accordance with the present invention.
Figure 6a shows a perspective view of the turn-circle for a mini grader configured in accordance with the present invention. 9

Figure 6b shows a cross-sectional view of the turn-circle of Figure 4a sectioned along its longitudinal center line X-X.
Figure 7a shows a perspective view of the upper wear pad configured in accordance with the present invention.
Figure 7b shows a perspective view of the lower wear pad configured in accordance with the present invention.
Figure 7c shows another perspective view of the upper wear pad configured in accordance with the present invention fitted on the turntable assembly.
DETALED DESCRIPTION OF THE ACCOMPANYING DRAWINGS
In the following, different embodiments of the present invention will be described in more details with reference to the accompanying drawings without limiting the scope and ambit of the present invention in any way.
Figure 1a shows a side view of the conventional motor grader 10 having a pair of front wheels 2, 6 and two pairs of rear wheels 6, 8 supporting the prime mover compartment and the operator’s cab. It also has a turn circle including a turntable assembly 12, a draw bar assembly 14, and a mechanism (not visible) to avoid wear between the turntable assembly 12 and the draw bar assembly 14. It also shows a scarifier 16, a moldboard 18, a prime mover compartment 20, e.g. an engine compartment and a rollover protective structure (ROPS) 22 as well as the operator’s cab equipped 24 with foot pedals for motor grader’s complete operation. The hydraulic cylinder 26 is shown mounted on the upwardly projecting front end portion 28 extending from the motor grader chassis 30.
Figure 1b shows a top view of the conventional motor grader shown in Figure 1a. The turntable assembly 12 along with the drawbar assembly 14 is encircled in red.
Figure 2 shows a detailed perspective view of the conventional turntable assembly 12 of a motor grader 10 shown in Figure 1. This assembly 12 includes a turn circle 13 and a turntable 15 holding a grader blade 32. 10

Figure 3a shows a perspective view of the turn circle 13 of the conventional motor grader 10 of Figure 1. The turn circle 13 is fitted with a plurality of composite wear inserts 40 which are normally made of nylon.
Figure 3b shows a perspective view of the draw bar assembly 14 of the conventional motor grader 10 of Figure 1.
Figure 4 shows an enlarged perspective view of the conventional composite nylon wear inserts 40 fitted by means of brackets 42 on the turn circle as shown in Figure 2. This conventional wear pad arrangement requires several of cast components.
Figure 5 shows an exploded perspective view of the turn-circle assembly 200 for a mini grader configured in accordance with the present invention. The assembly 200 consists of: a turntable assembly 210 disposed under the draw bar assembly 220. A pair of wear pads 212 are assembled on top of the draw bar in the wear pad assembly 230 (Figure 6b). The wear pad assembly 230 includes a top wear pad center ring 232 disposed under the wear pads 212 and a bottom wear pad center ring 234 disposed above the center ring assembly 240 and a radial wear pad center ring 236 disposed between the top and bottom wear pad center rings 232, 234 and surrounding the upper flange of the center ring assembly 240, on which a plurality of fasteners 238 is tightened for assembling the wear pad assembly 230. The front end of the draw bar 220 is also configured with a pair of pivot shafts 310 for supporting hydraulic cylinders (not shown) for turning the turn table 210.
Figure 6a shows a perspective view of the turn-circle assembly 200 of Figure 5. The turntable assembly 210 can be suitably turned with respect to the draw bar assembly 220, i.e. about its longitudinal axis X-X by means of a pair of hydraulic cylinders 320.
Figure 6b shows a cross-sectional view of the turn-circle assembly of Figure 6a sectioned along its longitudinal center line X-X. The center ring assembly 240 is fitted from below the turntable assembly 210 and supporting the draw bar assembly 210 and tightening the wear pad assembly by means of the plurality of fasteners 238. As already described above with reference to Figure 5, the wear pad assembly consists of a pair of wear pads 212, a top wear pad center ring 232, a bottom wear pad center ring 234, a center ring assembly 240 and a radial wear pad center ring 236 disposed between the top and bottom wear pad center rings 232, 234 and surrounding the upper flange of the center ring assembly 240. 11

Figure 7a shows a perspective view of the top wear pad center ring 232 with the grease pockets 233 configured in accordance with the present invention showing.
Figure 7b shows a perspective view of the bottom wear pad 234 with the grease pockets 235 configured in accordance with the present invention showing.
Figure 7c shows another perspective view of the top wear pad 232 with the grease pockets 233 (encircled in red) configured in accordance with the present invention and fitted on the turntable assembly 210.
WORKING OF THE INVENTION:
The drawbar assembly which connects with the main chassis frame through a ball joint and mounts one end of the hydraulic cylinder 320 while the turn table assembly having a single top turntable plate (does not require both top and bottom plate as in the conventional turn table discussed above) and hydraulic cylinders 320 mount on the turn table by means of simple brackets 322.
Thus, no roller arrangement is required in the turn circle assembly configured in accordance with the present invention.
Moreover, the new turn table 210 has a rotary motion with reference to the draw bar 220 by using the hydraulic cylinders 320. As the hydraulic cylinders 320 are mounted on the draw bar 220 and the turn table 210, so complete turn circle assembly can be tilted in any direction using the ball joints.
With this configuration, in which the draw bar 220 and center ring assembly 240 hold the turn table 210 and lower wear pads 234 are provided to avoid metal to metal contact.
Thus, the top wear pad center ring 232, bottom wear pad center ring 234 and radial wear pad center ring 236 disposed therebetween avoid the direct contact. The bottom wear pad center ring 234 avoids direct contact of bottom face of the plate of the turn table 210 with the center ring assembly 240. The radial center ring wear pad 236 avoids the direct contact of center ring assembly 240 with the plate thickness of the turn table 210, while the top wear pad center ring avoids the direct contact of bottom face of the plate of the draw bar 220 and upper face of the plate of the turn table 210. 12

All three wear pad center rings are simple in design and do not require any particular skill level for the assembly of the bottom face of the turn table plate to the center ring of the bottom plate.
Adjustable wear pads 212 are used to maintain a constant gap between the moving parts (i.e. turn table 210 and drawbar 220 and center ring assembly 240). Top and bottom wear pads 232, 234 and the holes 233, 235 created therein act as greasing pockets to store the grease whenever required and thus, substantially reduce the greasing frequency of the assembly.
TECHNICAL ADVANTAGES AND ECONOMIC SIGNIFICANCE
The turn-circle assembly for a mini grader configured in accordance with the present invention has the following technical and economic advantages:
• Cost-effective, i.e. 1/4th the cost of conventional grader assembly.

• Simple to manufacture and maintain

• Easy to service

• Reduced number of components

• Tiltable with respect to horizontal as well as vertical plane

• Need very low-precision wear pads

• Wear pad mechanism is very light-weight

• Lubrication of the wear pad mechanism is easy by grease pockets provided.

• Less than 360-degree turntable turning required in most (90%) of the mini grader applications.

• In-house design eliminates the dependency on the suppliers.

The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. 13

The embodiments herein and the various features and advantageous details thereof are explained with reference to the non-limiting embodiments in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein.
It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.
The numerical values given of various physical parameters, dimensions and quantities are only approximate values and it is envisaged that the values higher or lower than the numerical value assigned to the physical parameters, dimensions and quantities fall within the scope of the disclosure unless there is a statement in the specification to the contrary.
Throughout this specification the word “comprise”, or variations such as “comprises” or “comprising”, shall be understood to implies including a described element, integer or method step, or group of elements, integers or method steps, however, does not imply excluding any other element, integer or step, or group of elements, integers or method steps.
The use of the expression “a”, “at least” or “at least one” shall imply using one or more elements or ingredients or quantities, as used in the embodiment of the disclosure in order to achieve one or more of the intended objects or results of the present invention.
The description provided herein is purely by way of example and illustration. The various features and advantageous details are explained with reference to this non-limiting embodiment in the above description in accordance with the present invention. The descriptions of well-known components and manufacturing and processing techniques are consciously omitted in this specification, so as not to unnecessarily obscure the specification.
A person skilled in the art may make innumerable changes, variations, modifications, alterations and/or integrations in terms of materials and method used to configure, manufacture and assemble various constituents, components, subassemblies and 14

assemblies, in terms of their size, shapes, orientations and interrelationships without departing from the scope and spirit of the present invention.
The exemplary embodiments described in this specification are intended merely to provide an understanding of various manners in which this embodiment may be used and to further enable the skilled person in the relevant art to practice this invention. Although the embodiments presented in this disclosure have been described in terms of its preferred embodiments, the skilled person in the art would readily modifications recognize that these embodiments can be applied with possible within the spirit and scope of the present invention as described in this specification.
While considerable emphasis has been placed on the specific features of the preferred embodiment described here, it will be appreciated that many additional features can be added and that many changes can be made in the preferred embodiments without departing from the principles of the invention.
These and other changes in the preferred embodiment of the invention will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation. 15

We claim:
1. A turn-circle assembly for a mini grader, wherein the assembly comprises a draw bar assembly and a turntable assembly and a wear pad assembly disposed between the draw bar assembly and the turntable assembly for avoiding contact between different components to reduce wear thereof.

2. Turn-circle assembly as claimed in claim 1, which comprises a pair of wear pads disposed between the draw bar assembly and turntable assembly and fastened along the longitudinal axis of the draw bar assembly and a center ring assembly supporting the pair of wear pads is fixed between the draw bar plate and the turntable plate; wherein the center ring assembly includes:

- a center ring consisting of a circular upwardly projection configured with a reduced diameter;

- a top center ring for the wear pad assembly;

- a bottom center ring for the wear pad assembly; and

- a radial center ring for the wear pad assembly disposed between the draw bar plate and the turntable plate;

wherein the radial center ring is configured with a lower thin plate having a larger diameter and which is configured with a concentric thick annular projection.
3. Turn-circle assembly as claimed in claim 2, wherein the top center ring prevents a direct contact of the bottom face of the draw bar plate with the upper face of the turntable plate.

4. Turn-circle assembly as claimed in claim 3, wherein each wear pad is inserted into a pocket configured in the draw bar plate and completely supported on the top center ring.

5. Turn-circle assembly as claimed in claim 2, wherein the bottom center ring prevents direct contact of bottom face of the turntable plate from the center ring.

6. Turn-circle assembly as claimed in claim 5, wherein the bottom center ring is inserted between the lower face of the turntable plate and the thin outer periphery of the center ring.
16

7. Turn-circle assembly as claimed in claim 2, wherein the radial center ring prevents a direct contact of the circular upwardly projection of the center ring from the turntable plate.

8. Turn-circle assembly as claimed in claim 7, wherein the radial center ring is disposed between the inner diameter of central aperture in the turntable plate and the outer diameter of the circular upwardly projection of the center ring.

9. Turn-circle assembly as claimed in anyone of the claims 1 to 8, wherein the turntable plate comprises a circular aperture for seating the circular upwardly projection of the center ring from below.

10. Turn-circle assembly as claimed in claim 9, wherein the circular upwardly projection of the center ring is configured with a plurality of threaded holes for fastening a respective fastener.

11. Turn-circle assembly as claimed in claim 9, wherein draw bar plate is configured with matching plurality of holes for tightening respective fasteners for making the turn circle assembly by assembling the draw bar plate and the turntable plate fitted with the wear pad assemblies disposed therebetween.

12. Turn-circle assembly as claimed in anyone of the claims 1 to 11, wherein the top center rings and the bottom center rings for the wear pad assemblies are configured with grease holes acting as greasing pockets to store the grease for lubrication in order to reduce the greasing frequency of the turn circle assembly.

13. Turn-circle assembly as claimed in anyone of the claims 1 to 12, wherein the material of the wear pads is nylon or bronze or any other similar material.

14. A method for assembling the turn circle as claimed in any of the claims 1 to 13, wherein the method comprises the following assembly steps:

• Placing the bottom center ring concentrically on the circular upwardly projection of the center ring;

• Placing the radial center ring between the inner diameter of the bottom center ring and the outer diameter of the circular upwardly projection of the center ring;
17

• Inserting the assembly of center ring, bottom center ring and the radial center ring obtained in previous step from below the turntable plate in the circular aperture configured therein;

• Placing the top center ring above the turntable plate along the longitudinal axis of the draw bar plate and disposed exactly above the respective bottom center ring;

• Inserting wear pads in the circular pockets configured along the longitudinal axis of the draw bar plate from the lower face of the draw bar plate;

• Placing the assembly of the wear pads with the draw bar plate formed in the previous step above the turntable plate by aligning the holes in the draw bar plate and the circular upwardly projection of the center ring; and

• Tightening respective fasteners in the draw bar plate with the wear pad assembly for assembling the draw bar plate and turntable plate to obtain the turn circle assembly.