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 testing device for simultaneously testing the dimensions of a plurality of profiles of a work
piece APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli,
Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTOR
Baidyanath Ghosh of Crompton Greaves Ltd, AMDTC, Global R&D Centre, Bhaskara, Kanjur Marg (East), Mumbai 400 042, India, both Indian Nationals
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed:

FIELD OF THE INVENTION
This invention relates to a testing device for simultaneously testing the dimensions of a plurality of profiles of a work piece.
BACKGROUND OF THE INVENTION
Dimensions of all the profiles of a mechanical work piece having irregular shape and size are required to be tested for size checks before being assembled into its target device. Usually, dimension, such as length, of each profile of the work piece is measured separately and turn by turn using a dial indicator. The free end of a spindle of the dial indicator engages with the profile at appropriate point depending upon the dimension of the profile to be measured. Thereafter, the measured value is manually compared to a reference value. Base on the result of the comparison(s), the work piece is either accepted or rejected. Such a technique of measuring the dimensions of each profile of the work piece separately and turn by turn and subsequently comparing it with a reference value is time consuming, requires skilled labour and prone to error.
DETAILED DESCRIPTION OF THE INVENTION
According to the invention there is provided a testing device for simultaneously testing the dimensions of a plurality of profiles of a work piece, the device comprising a frame adapted to hold the work piece on a top surface thereof, a dial indicator corresponding to each profile of the work piece to be tested held horizontally over the top surface of the frame by a supporting means, and a movable contact member corresponding to each dial indicator held slidingly on the top surface of the frame between the respective dial indicator

and the profile of the work piece to be tested, a free end of the spindle of each dial indicator being connected to respective the movable contact member.
According to a preferred embodiment, the work piece is a holding catch used in a switchgear comprising a body hole and three projections each extending outwardly from the body hole in a spaced apart relationship with each other. The frame comprises an upstanding member projecting from the top surface of the frame extending through the body hole of the work piece and a circular clamp to be placed over the work piece for holding thereof firmly on the top surface of the frame.
The supporting means is a dial gauge mounting block mounted on the top surface of the frame between the dial indicator and the movable contact member, the dial gauge mounting block supporting the dial indicator at its neck such that the spindle of the dial indicator extends through a hole provided on the dial gauge mounting block.
The movable contact member comprises a profile gauge block and a sliding block fastened adjacently to each other wherein the profile gauge block being taller than the sliding block and facing the profile of the work piece to be measured, the free end of the spindle of the dial indicator extending over the sliding block and thread engaged to the profile gauge block, the sliding block being connected to the cam means at the bottom surface thereof for sliding thereof between the profile of work piece to be measured and the dial indicator
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,
Fig 1 is a work piece according to a preferred embodiment.

Fig 2a and 2b are respectively an isometric view of a testing device with and without a work piece placed therein for simultaneously testing the dimensions of a plurality of profiles of the work piece.
Fig 3 is a bottom view of a testing device for simultaneously testing the dimensions of a plurality of profiles of a work piece.
As shown in figs 2a and 2b, the a testing device for simultaneously testing dimensions of a plurality of profiles of a work piece of Fig 1 comprises, according to a preferred embodiment, a four-legged table frame 9 dimensioned and profiled to hold various components of the device (as described below) on its top 7 and bottom surface 34. The work piece 1 as shown in Fig 1, according to a preferred embodiment, is a holding catch used in switchgear mechanism and comprises a body hole 2 and three profiles 3, 4 & 5 each extending outwardly from the body hole 2 in a spaced apart relationship with each other. The work piece 1 is held horizontally on top surface 7 such that an upstanding member 6 projecting from the top surface 7 of the frame 9 extends through the body hole 2 of the work piece 1. A circular clamp 8 having a center hole is placed over the work piece 1 extending through the upstanding member 6 for holding the work piece 1 firmly on the top surface 7. Four dial indicators 10, 11, 12 & 13 are held horizontally over the top surface 7 of the frame 9 such that the free ends of spindles 19, 21, 22 of three dial indicators 10, 12, 13 faces the profiles 3, 4, 5 of the work piece and the free end of the spindle 20 of the fourth dial indicator 11 faces an area 14 of the work piece 1 between the projections 3 & 4. Each dial indicator 10, 11, 12, 13 is supported at its neck by a dial gauge mounting block 15, 16, 17, 18 mounted on the top surface 7 in front of the respective dial indicators 10, 11, 12, 13 such that the spindles 19, 20, 21, 22 from each dial indicators 10, 11, 12, 13 extends through a hole in the dial gauge mounting blocks 15, 16, 17, 18. The testing device further comprises a movable contact members held on the top surface 7 in front the respective dial gauge mounting blocks

15, 16, 17, 18 and in a spaced apart relationship therewith. According to the preferred embodiment, each movable contact member comprises a profile gauge block 23, 24, 25, 26 and a sliding block 27, 28, 29, 30 fastened adjacently to each other such that the profile gauge blocks 23, 24, 25, 26 faces the profiles 3, 14, 4, 5 of the work piece 1 and the sliding blocks 27, 28, 29, 30 faces the respective dial gauge mounting blocks 15, 16, 17, 18. The profile gauge blocks 23, 24, 25, 26 are provided taller than the sliding blocks 27, 28, 29, 30 such that the spindles 19, 20, 21, 22 of the respective dial indicators 10, 11, 12, 13 extends over the corresponding sliding blocks 27, 28, 29, 30 such that the free ends of the spindles 19, 20, 21, 22 is thread engaged within a hole in the respective profile gauge blocks 23, 24, 25, 26. As shown in Fig 3, the bottom surfaces of the sliding blocks 27, 28, 29, 30 are connected to a cam means 32 mounted at the bottom surface 34 of the frame 9 for sliding the profile gauge blocks 23, 24, 25, 26 fastened therewith towards and away from the profiles 3, 14, 4, 5. A setting screw 31 is provided proximally to the free ends of the spindles 19, 20, 21, 22 of the dial indicators 10, II, 12, 13 for zero-setting the dial indicators 10, 11, 12,13.
For simultaneously testing the dimension of different profiles 3, 14, 4, 5 of the work piece 1 as shown in Fig 1, a reference work piece is first placed on the top surface 7 and the circular clamp 8 placed over it. The cam means 32 is then actuated to move the sliding blocks
27, 28, 29, 30 and consequently the profile gauge blocks 23, 24, 25, 26 fastened therewith towards the profiles 3, 14, 4, 5 in front thereof. The sliding blocks 27, 28, 29, 30 are slid upto an extent of making a contact of the profile gauge blocks 23, 24, 25, 26 with the profiles 3, 14, 4, 5 of the work piece 1 in front of it. Thereafter, all the dial indicators 10, 11, 12, 13 are set to zero by adjusting the setting screws 31 of the dial indicators 10, 11, 12, 13. The reference work piece is then removed from the frame 9 by sliding back the sliding blocks 27,
28, 29, 30 through the cam means 32. Thereafter, a fresh work piece 1 which is to be tested is placed on the top surface 7 in the same manner as the reference piece was placed with the

clamp 8 placed on it. The sliding blocks 27, 28, 29, 30 are slid through the cam means 32 to the make a contact of the respective profile gauge blocks 23, 24, 25, 26 with the profiles 3, 14, 4, 5 of the work piece 1 in front thereof. Since the dial indicators were set to zero, any change in the position of the profile gauge blocks 23, 24, 25, 26 as compared to their earlier position when the reference work piece was placed is indicated on the dial indicators 10, 11, 12, 13. If the readings on all the dial indicators 10, 11, 12, 13 is not zero and also outside tolerance limit, the work piece 1 is concluded to be not matching with the reference work piece.
According to the invention, the testing device facilitates a quick, easy and hassle free simultaneous testing of the dimensions of different profiles if the work piece thus saving a lot of time and resources.
It will be apparent to a person skilled in the art that the number of the dial gauges and placement thereof on the frame depends on the requirement and the work piece to be measured. The movable contact member may not be a two-part assembly as described in the preferred embodiment. The sliding means may not be necessarily a cam means and there may be other means which serves the purpose.
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. It 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 testing device for simultaneously testing the dimensions of a plurality of profiles of a work piece, the device comprising a frame adapted to hold the work piece on a top surface thereof, a dial indicator corresponding to each profile of the work piece to be tested held horizontally over the top surface of the frame by a supporting means, and a movable contact member corresponding to each dial indicator held slidingly on the top surface of the frame between the respective dial indicator and the profile of the work piece to be tested, a free end of the spindle of each dial indicator being connected to respective the movable contact member.
2. The testing device as claimed in claim 1, wherein the supporting means is a dial gauge mounting block mounted on the top surface of the frame between the dial indicator and the movable contact member, the dial gauge mounting block supporting the dial indicator at its neck such that the spindle of the dial indicator extends through a hole provided on the dial gauge mounting block.
3. The testing device as claimed in claim 1, wherein the movable contact member comprises a profile gauge block and a sliding block fastened adjacently to each other wherein the profile gauge block being taller than the sliding block and facing the profile of the work piece to be measured, the free end of the spindle of the dial indicator extending over the sliding block and thread engaged to the profile gauge block, the sliding block being connected to the cam means at the bottom surface thereof for sliding thereof between the profile of work piece to be measured and the dial indicator.

4. The testing device as claimed in claim 1, wherein the work piece is a holding catch used in a switchgear comprising a body hole and three projections each extending outwardly from the body hole in a spaced apart relationship with each other.
5. The testing device as claimed in claim 4, wherein the frame comprises an upstanding member projecting from the top surface of the frame extending through the body hole of the work piece and a circular clamp to be placed over the work piece for holding thereof firmly on the top surface of the frame.