FORM 2
THE PATENTS ACT 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION (See Section 10; rule 13)


TITLE OF THE INVENTION Flushness Measurement Device And Method Of Measuring Thereof
APPLICANTS
TATA MOTORS LIMITED
an Indian company, having its registered office
at Bombay House, 24 Homi Mody Street,
Hutatma Chowk,
Mumbai 400 001 Maharashtra, India
INVENTOR
Mr. Sudhir M Sutar and Mr.Nitin V Kontamwar
Both are Indian Nationals
of TATA MOTORS LIMITED,
an Indian company having its registered office
at Bombay House, 24 Homi Mody Street, Hutatma Chowk,
Mumbai 400 001 Maharashtra, India

PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner
in which it is to be performed


FIELD OF INVENTION
This invention is related to measuring device and more particularly it relates to flushness measurement device.
BACKGROUND OF INVENTION
To measure the quality of assemblies comprising spaced panels it is desirable to measure the spacing between panel edges and panel surfaces. For example all automobiles have flushness between doors and surrounding panels as well as between the hood and fenders, doors. During manufacture measurements are frequently made to assure that the correct gap and the panel flushness has been obtained. Conventionally, it has been the practice to use manually operated comparators like filler gauges and straight edge tools to make the gap and flushness measurements. These methods are very slow, with more fatigue and its accuracy is highly dependant on the skill of operator. These results are also indicative .The process of measuring flushness is mainly carried on last stage assembly of any automobile.
In order to address above problems, the flushness measurement device is developed which is useful to measure flushness of adjacent panels after assembly.
This device also helps to ascertain whether the part has achieved the desired design flushness position after assembly.
In comparison to modern methods of measurement where measurements are linked to computer systems, this present device is quite economical, handy and portable.
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This device can be carried to any place like dealer for flushness measurement BRIEF DESCRIPTION OF INVENTION
In accordance to present invention flushness measurement device comprises; hardened metallic machined block (3) having hole, machined bush (4) disposed in the said hole of said metallic block, dial gauge (5) having probe attached to said block through bush provided therein and a mechanical screw (6) for locking the stem of said dial gauge. There are two metallic machined block one is having flat contact surface (7) respectively.
• Placing the flat surface of said block on vehicle body panel
• Setting the zero of dial gauge
• Recording the value of distance between the said probe and said contact surface
• Recording the distance between said first vehicle body panel and second body panel
• Determining the flushness value.
OBJECTS OF INVENTION
The main object of the present invention is to provide flushness measurement device and method of measuring thereof.
Another object of the present invention is to provide flushness measurement device which is simple in construction and cost effective
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BRIEF DESCRIPTION OF DRAWINGS
Fig.l;-Schematic cut section of conventional vehicle.
Fig.2;-Shows the flushness measuring tool with flat surface (7).
Fig.3:-Shows the flushness measuring tool with curved surface (7).
Fig.4:-Shows the method for using the current tool.
Fig.5:-Shows the isometric view of flushness measuring tool with flat surface.
Fig.6:-Shows the isometric view of flushness measuring tool with curved surface.
DETAILED DESCRIPTION OF THE INVENTION
Referring now to the drawings wherein the showings are for the purpose of illustrating a preferred embodiment of the invention only, and not for the purpose of limiting the same,
In accordance to present invention flushness measurement device comprises; hardened metallic machined block (3) having hole, machined bush (4) disposed in the said hole of said metallic block, dial gauge (5) having probe attached to said block through bush provided therein and a mechanical screw (6) for locking the stem of said dial gauge. There are two metallic machined block one is having contact surface (7) respectively.
Wherein said contact surface (7) is flat surface or curved surface.
Referring to figure-01 which shows the pair of first body panels (1) and second body panel (2) representing two adjacent parts of metal structure such as conventional vehicle body. The surfaces of these parts are intended to be nearly in the same plane or flush. At section U-U the planes of said two panel are separated by a distance
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"X" which is distance between said two panels and determined by flushness measurement.
Referring to figure-02 and 03, which shows the tool for measuring flushness .The said block (3) which is metallic machined block comprising holes provide therein and the machined bush (4) is disposed in the said holes of said block. A dial gauge (5) is mounted on the stem provided on it for measuring. The said bush is provided to locate the stem of said dial gauge. The said stem of dial gauge sits inside the said bush (2). A mechanical screw (6) is provided for locking the stem of said dial gauge. The said metallic machined block (3) is having contact surface (7) which is flat or curved surface. While measuring the flushness "D" is distance between contact surface and probe tip of said dial gauge The distance between said contact surface and said probe tip plays a major role while computing the flushness value between two adjacent panels.
In flushness measurement there two conditions namely,
• Under flushness
• Over flushness.
These conditions are dependant where we measure the flushness.
Initially, the said metallic machined block (3) is placed with a dial gauge on any surface plate to get the correct value of "D" from the said contact surface which is directly obtained on a dial gauge.
To measure the flushness (i.e. Under or Over) a metallic machined block (3) with said contact surface (7) is kept on one of the first body panel (1) and the probe tip of said dial gauge (5) is on second body panel (2), then distance XI is distance between first body panel (1) and second body panel (2) . The said distance XI is obtained
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from said dial gauge (5). The desired flushness (Under or over) between two adjacent panels is obtained by subtracting the distance "D" from "X1'i.e (X1 - D) which is
flushness.
The present device provides accurate measurement of flushness between pair of panels in a short period of time. This device is portable device. This is also cost effective and will use to determine the flushness value between any two adjacent panels in any industry.
Method of measuring
• Placing the flat surface of said block on vehicle body panel
• Setting the zero of dial gauge
• Recording the value of distance between the said probe and said contact surface
• Recording the distance between said first vehicle body panel and second body panel
• Determining the flushness value
The foregoing description is a specific embodiment of the present invention. It should be appreciated that this embodiment is described for purpose of illustration only, and that numerous alterations and modifications may be practiced by those skilled in the art without departing from the spirit and scope of the invention. It is intended that all such modifications and alterations be included insofar as they come within the scope of the invention as claimed or the equivalents thereof.
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WE CLAIM
1. A flushness measurement device comprising:
a metallic block;
a bush disposed in an aperture provided in said metallic block;
a dial gauge having a probe attached and fastened to said metallic block through said bush; and
a contact surface provided on said metallic block, such that a predefined distance between said probe tip of said dial gauge and said contact surface is calibrated to facilitate flushness measurement between any adjacent surfaces.
2. The device as claimed in claim 1, wherein said metallic block is machined block.
3. The device as claimed in claim 1, wherein said contact surface is a fiat surface.
4. The device as claimed in claim 1, wherein said contact surface is a curved surface.
5. The device as claimed in claim 1, wherein said contact surface is configured to be mounted on a first panel surface and said dial gauge probe is configured to be mounted on a second panel surface, to measure flushness between said first and second panel surfaces.
6. A method for testing flushness between two panel surfaces using the device as claimed in any one of the claims 1 to 4 comprising the steps of:
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determining the calibrated distance (D) between said contact surface of said metallic block and said dial gauge probe tip;
placing said contact surface of said metallic block on said first panel surface;
placing said dial gauge probe on said second panel surface;
setting dial gauge to zero;
recording distance between said probe and said contact surface (X1); and
determining the flushness between said first and second panel surfaces using the formula: Xl-D.
7. The method as claimed in claim 5, wherein said first and second panel surfaces are vehicular panel and/or door surfaces.
8. A flushness measurement device as hereinabove described with reference to the accompanying drawings.
Dated this 3rd day of February 2009
TATA Motors Limited By their Agent & Attorney
(Karuna Goleria)
of De PENNING & De PENNING