Title of Invention

A DEVICE FOR TRANSMITTING ROTARY MOTION AND METHOD THEREOF

Abstract The present invention relates a geared speed / revolution indicating device, wherein the rotation of Spindle, the drive shaft (1) is transmitted directly to a measuring mechanism (4) via a pair of toothed gear (2, 3). One toothed gear (2) is arranged on the spindle (1) and another toothed gear is arranged on the measuring device (4). The toothed gears (2, 3) are configured as worm or helical gear. Figure 1.
Full Text

FIELD OF INVENTION
This invention relates to a device and method for transmitting rotary motion from a driver shaft onto a second shaft for measuring angular speed of said rcftary motion, said device comprises: a driver shaft with toothed gear meshed with that of second shaft wherein axis of the driver shaft is at an angle with that of the second shaft, and a measuring device fixed to the second shaft. The method comprises meshing the driver shaft toothed gear with that of the second shaft wherein the driver shaft axis is at an angle with that of the second shaft, and fixing the second shaft with a measuring device.
BACKGROUND OF THE INVENTION
In the existing trends it is seen that the driving shaft axis is inline with the axle (7). But this is not desired since driving shaft housing fouling with Head lamp in vehicle. Hence it is desired that the driving shaft axis is offset towards left (From Inst cluster viewing angle) with respect to Axle (7) inorder to prevent driving shaft housing fouling with Head lamp in vehicle.
In addition it is desire that the driving shaft is in an angle with respect to second shaft (2) inorder to maintain the cable in-line / straight & prevent sharp bend at mounting condition. The driving shaft angle will compensate the Instrument cluster mounting angle in vehicle & always maintain the drive shaft perpendicular to ground level. Hence cable sharp bend is eliminated at assembly condition in vehicle. This inturn prevents ovality & reduces friction of inner cable / flexible shaft during rotation. Hence enhancing the speed measuring device quality.
PRIOR ART:
Title: GEARED MEASURING DEVICE, ESPECIALLY FOR A TACHOMETER OR A
REVOLUTION COUNTER
PCT publication number: WO9852048

This publication can be considered as the closest prior art relating to instant invention. This invention also deals with the above mentioned problems and proposes a solution. The invention WO9852048 is related to a geared measuring device, wherein the rotation of the drive shaft can be transmitted to an intermediate shaft via a first pair of toothed gears and from the intermediate shaft to a measuring device drive mechanism via a second pair toothed gears. To this end, a first toothed gear is arranged on the drive shaft and a second toothed gear is arranged on the measuring device. The parts of the toothed gear pairs are configured on the intermediate shaft as a cylindrical worm and at least one toothed gear has a semi-globoidal shape gear.
Instant invention also addresses all the problems as mentioned above. At the same time, it differs from the prior art WO9852048 in the way in which the desired objective is achieved. Instant invention provides for more efficient and cost effective means of solving the problem. Instant invention has come out with a method and a device, wherein there is no need for the intermediate shaft for transfer of energy to measure the speed of rotation. Accordingly, the invention provides for more accurate measurement of the speed of rotation. In addition, avoiding intermediate shaft in the invention will result in more efficient transfer of energy. Further, this avoids wastage of energy because of indirect way of transfer of the rotary energy from first shaft to second shaft via intermediate shaft as stated in prior art. This will further reduce wear and tear of the device and will also reduce the cost of manufacturing of the device.
BRIEF DESCRIPTION OF DRAWINGS
Figure 1: shows the schematic diagram of the transmission of Instrument movement
containing Spindle, First gear wheel, Second gear wheel & measuring device.
Figure la: shows perspective view of figure 1
Figure 2: shows instant invention comprising speed indicator pointer along with
odometer.
Figure 2a: shows front view of figure 2.
Figure 2b: shows back view of figure 2.
Figure 3a: back view of instant invention
Figure 3b: side view of instant invention

Figure 3c: front view of instant invention Figure 3d: perspective view of instant invention
OBJECTS OF THE INVENTION
The primary object of the invention is to develop a device for transmitting rotary motion
from a driver shaft onto a second shaft for measuring angular speed of said rotary motion.
Another object of this invention is to develop a driver shaft with toothed gear meshed
with that of second shaft wherein axis of the driver shaft is at an angle with that of the
second shaft.
A further objective of the invention is to develop a measuring device fixed to the second
shaft.
Another main objective of the invention is to develop a method for transmitting rotary
motion from a driver shaft on to a second shaft for measuring the angular speed of said
rotary motion.
Yet another objective of the invention is to provide for meshing the driver shaft toothed
gear with that of the second shaft wherein the driver shaft axis is at an angle with that of
the second shaft
Still another objective of the invention is to provide for fixing the second shaft with a
measuring device.
STATEMENT OF INVENTION
Accordingly the invention provides a device for transmitting rotary motion from a driver shaft onto a second shaft for measuring angular speed of said rotary motion, said device comprises: a driver shaft with toothed gear meshed with that of second shaft wherein axis of the driver shaft is at an angle with that of the second shaft, and a measuring device fixed to the second shaft. This also provides for a method for transmitting rotary motion from a driver shaft on to a second shaft for measuring the angular speed of said rotary motion, said method comprising steps of: meshing the driver shaft toothed gear with that of the second shaft wherein the driver shaft axis is at an angle with that of the second shaft, and fixing the second shaft with a measuring device.

DETAILED DESCRIPTION OF INSTANT INVENTION
The primary embodiment of the invention is a device for transmitting rotary motion from a driver shaft onto a second shaft for measuring angular speed of said rotary motion, said device comprises: a driver shaft with toothed gear meshed with that of second shaft wherein axis of the driver shaft is at an angle with that of the second shaft, and a measuring device fixed to the second shaft.
In yet another embodiment of the present invention the rotary motion of the second shaft is same as that of the driver shaft.
In still another embodiment of the present invention the angle is 10 to 80 .
In still another embodiment of the present invention the toothed gear is worm or helical gear.
In still another embodiment of the present invention toothed gear of the second shaft is meshed with that of a horizontal shaft for counting the rotary motion.
In still another embodiment of the present invention eddy current principle is used for measuring the angular speed.
In still another embodiment of the present invention the device measures angular speed in automobile.
Another main embodiment of the present invention is a method for transmitting rotary motion from a driver shaft on to a second shaft for measuring the angular speed of said rotary motion, said method comprising steps of: meshing the driver shaft toothed gear with that of the second shaft wherein the driver shaft axis is at an angle with that of the second shaft, and fixing the second shaft with a measuring device.
In yet another embodiment of the present invention the speed is measured using eddy current principle.

In still another embodiment of the present invention toothed gear of the second shaft is meshed with that of a horizontal shaft for counting the rotary motion.
In still another embodiment of the present invention the method measures angular speed in automobile.
Instrument movement for a speedometer or a tachometer or a revolution counter employed with frame (5) made of sheet metal or die casted or Injection molded plastic holding spindle (1), toothed gears (2, 3), measuring device (4). The Spindle holds the first toothed gear (2) and measuring device contains the second toothed gear (3) wherein the first toothed gear meshes directly with second toothed gear. The meshing angle between first toothed gear and second toothed gear varies from 10° to 60°. The first toothed gear & second toothed gear are designed as helical gear.
The measuring device carries Axle (7) wherein the speed / RPM indicating pointer (8) is fitted to the Axle. The frame holds the Horizontal shaft (6) in which second toothed gear is meshed with Horizontal shaft for motion transmission to Odometer / revolution counter (9).the horizontal shaft has worm gear.
Power / motion from flexible shaft / cable is transmitted to first toothed gear through spindle. The power in-turn is transmitted to second toothed gear in which first toothed gear is directly meshed with second toothed gear. The second toothed gear distributes the motion / power to both speed measuring device & Horizontal shaft for counting revolution (Odometer).
Task of the invention is it therefore, an Instrument movement with a transmission on admits, with which the turn of the drive shaft / spindle is transferable over a first tooth wheel mating directly over a second toothed gear which distributes motion / power to speed measuring device & revolution counter through horizontal shaft, can simply be mounted and only little building area is required. This task according to invention by the fact it is drawn that two gear wheel are implemented as worm / helical gears.

The invention has the advantage that intermediate shaft is not required for motion transmission from first gear wheel to second gear wheel. Horizontal shaft / intermediate shaft is required only for motion transmission from second gear wheel to Odometer or revolution counter. Also horizontal shaft can be eliminated when the measuring device contains only speed / RPM indicator without revolution counter / Odometer.
The first gear wheel & second gear wheel rotates in same direction having transmission ratio 1:1 and gear meshing angle can be varied from 10° to 60° or even upto 80°. This results in axis offset between Spindle & Speed indicating pointer. The worm gear wheels are small and nevertheless quiet transmission, with which the potential danger of struck up / blocking is impossible. Further worm gear wheels can be produced by injection molding process. Thus Instrument movement indicating speed / RPM works, under eddy current principle is simple and long-lived construction unit.
The measuring device contains a magnet (10), Magnet cover (11), Temperature compensator (12) which are integrated with second gear wheel. This in-turn is surrounded by a cup drag (13) and the same tends to rotate the Speed indicating pointer. It also has a spring spiral (14).
Figure 1 shows the schematic diagram of the transmission of Instrument movement containing Spindle, First gear wheel, Second gear wheel & measuring device.
Figure 2 shows the schematic diagram of the transmission of Instrument movement containing Frame, Spindle, First gear wheel, Second gear wheel & measuring device. Measuring device includes Magnet, Compensator, Magnet cover, Axle, Spring spiral, Cup damping & Speed indicating pointer.
The present invention relates geared speed / revolution indicating device, where in the rotation of Spindle, the drive shaft (1) is transmitted directly to an measuring mechanism (4) via a pair of toothed gears (2, 3). One toothed gear (1) is arranged on the spindle (1) and another toothed gear is arranged on the measuring device (4). The toothed gears (1,2) are configured as worm or helical gear. The Instrument movement

works under eddy current principle. The Horizontal shaft (1) comprises further gear wheel (6) which transmits motion to odometer. The tooth wheel mating between the Horizontal shaft (6) and Odometer is implemented as worm and helical gears. Second gear wheel (worm / helical gear) is integrated with magnet. The magnet is in contact with temperature compensation disc. The Cup drag partially covers the magnet assembly. The magnet assembly is enclosed partially in the magnet cover.





































We claim:
A device for transmitting rotary motion from a driver shaft onto a second shaft for measuring angular speed of said rotary motion, said device comprises:
a. a driver shaft with toothed gear meshed with that of second shaft wherein
axis of the driver shaft is at an angle with that of the second shaft, and
b. a measuring device fixed to the second shaft.
The device for transmitting rotary motion as claimed in claim 1, wherein the rotary motion of the second shaft is same as that of the driver shaft.
The device for transmitting rotary motion as claimed in claim 1, wherein the angle is 10° to 80°.
The device for transmitting rotary motion as claimed in claim 1, wherein the toothed gear is worm or helical gear.
The device for transmitting rotary motion as claimed in claim 1, wherein toothed gear of the second shaft is meshed with that of a horizontal shaft for counting the rotary motion.
The device for transmitting rotary motion as claimed in claim 1, wherein eddy current principle is used for measuring the angular speed.
The device for transmitting rotary motion as claimed in claim 1, wherein the device measures angular speed in automobile.
A method for transmitting rotary motion from a driver shaft on to a second shaft for measuring the angular speed of said rotary motion, said method comprising steps of:
a. meshing the driver shaft toothed gear with that of the second shaft wherein
the driver shaft axis is at an angle with that of the second shaft, and
b. fixing the second shaft with a measuring device.

The method for transmitting rotary motion as claimed in claim 8, wherein the speed is measured using eddy current principle.
The method for transmitting rotary motion as claimed in claim 8, wherein toothed gear of the second shaft is meshed with that of a horizontal shaft for counting the rotary motion.
The method for transmitting rotary motion as claimed in claim 8, wherein the method measures angular speed in automobile.


Documents:

1127-CHE-2007 AMENDED PAGES OF SPECIFICATION 12-07-2011.pdf

1127-CHE-2007 AMENDED CLAIMS 12-07-2011.pdf

1127-che-2007 form-3 12-07-2011.pdf

1127-CHE-2007 EXAMINATION REPORT REPLY RECEIVED 12-07-2011.pdf

1127-CHE-2007 FORM-13 15-01-2010.pdf

1127-CHE-2007 FORM-3 15-01-2010.pdf

1127-che-2007-abstract.pdf

1127-che-2007-claims.pdf

1127-che-2007-correspondnece-others.pdf

1127-che-2007-description(complete).pdf

1127-che-2007-drawings.pdf

1127-che-2007-form 1.pdf

1127-che-2007-form 26.pdf

1127-che-2007-form 3.pdf

1127-che-2007-form 5.pdf

1127-che-2007-others document.pdf


Patent Number 249121
Indian Patent Application Number 1127/CHE/2007
PG Journal Number 40/2011
Publication Date 07-Oct-2011
Grant Date 30-Sep-2011
Date of Filing 30-May-2007
Name of Patentee PRICOL LIMITED
Applicant Address P.B. NO 6331, (1087-A) ,NEW NO .702/7, AVANASHI ROAD, COIMBATORE-641 037,TN
Inventors:
# Inventor's Name Inventor's Address
1 P.SANTHANAKRISHNANA 225, PALAMALAI ROAD, SAMICHETTYPALAYM, COIMBATORE -641 047,TN
2 K.MUTHUMANICKAM 619 # 5, AC CHURCH ROAD, NEAR VETINARY HOSPITAL, PANDIAN NAGAR, KARIAPATTI-626 106, VIRDHUNAGAR DISTRICT ,TN
3 M.MANIVANNAN A1-304 "LOTUS" SREEVATSA GARDENS THUDIYALUR , COIMBATORE -641 034 ,TN
PCT International Classification Number F15B13/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA