FORM 2
THE PATENTS ACT 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION (See Section 10; rule 13)
TITLE OF THE INVENTION
Torso Extension Bracket For Crash Test Dummy For Photographic Reference And Method Of Preparing Dummy And Performing Crash Test
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
INVENTORS
V S Gogate, Ajay Chavare
And Sharad Kadam
All 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 Maharashtr^ India
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner
in which it is performed.

FIELD OF INVENTION
This invention relates to a crash test dummy & more particularly for provision of an extension bracket on the torso for photographic reference.
BACKGROUND OF INVENTION
Whiplash injuries in slow speed rear impacts have emerged as a significant road safety hazards in recent past. "Whiplash injuries" are set of common symptoms of pain in head, neck, shoulders & arms alongwith muscles, ligaments & vertebrae. Uncontrolled movement of head with respect to the torso, through neck, is identified as the mechanism for resulting into these movements. These symptoms are predominantly observed under the influence of deceleration in rearward directions as seen in slow speed rear impacts (15 to 20 kmph).
Head restraints (not. head rests) are observed to be quite efficient in extending the required support to the head during the rearward decelerations. These head restraints minimise the uncontrolled movement of the head & also absorb the kinetic energy of the head with soft cushioning.
However it is necessary that the head restraint geometry, strength & its energy absorbing capability is adequate to avoid injuries to the occupant. Global Technical Regulation 7 (GTR7) has defined a dynamic test for assessment of the injuries to the occupant in the event of slow speed rear impacts which also evaluates the aspects of the head restraints mentioned previously.
Crash test dummies were originally developed for assessing the occupant injuries in the event of frontal impacts. Recently these dummies have also been used for assessment of the occupant injuries in the rear impact. One of the injury parameter that is proposed to be assessed by these dummies is the neck rotation during rear impact situations. The crash test dummy does not have capability for measurement of the neck rotation at present. The assessment procedures being quite new, not much of the information is available regarding the neck rotation measurement techniques.

One of the ways would be to use photography during the test to capture the torso, neck, head movements and compute the neck rotations. During test photography, the necessary dummy parts are Fixed with marker stickers which can be tracked later to compute the movements of a particular part of the dummy. However a crash test dummy does not have a surface to fix marker stickers to track movements of the torso.
OBJECTS OF THE INVENTION
The main object of the present invention is to obviate the above drawbacks.
Another object of the present invention is to provide an extension bracket at the torso
of crash test dummy (e.g. a hybrid 3 50th percentile) for fixing the photographic
references.
Another object of the present invention is to provide an extension bracket which is
simple in construction & cost effective.
STATEMENT OF INVENTION
Accordingly the present invention provides 1. Torso extension bracket for crash test
dummy for photographic reference comprising of
at least one transverse extension plate;
at least one pair of longitudinal extensions plate;
at least one spacer and at least one pair of mounting fasteners;
at least one marker sticker adapted for tracking and computing positions.
The Method of preparing dummy and performing crash test with said torso extension bracket mounted on said crash test dummy for photographic reference comprising the steps of
• preparing a dummy by removing the dummy head, neck, hands and dummy jacket;
• removal of the shoulder attachment fasteners to insert the transverse plate and spacer to the shoulder structure with the spacers;

• attachment of said transverse plate, spacer and shoulder structure together to the chest structure by longer mounting bolts;
• putting said dummy jacket on said dummy;
• connecting the longitudinal extension on either end of the transverse plate;
• fitting of hands, neck and head back to the dummy;
• placing said dummy on the test sample seat;
• fixing of appropriate marker stickers on the longitudinal extensions as well as on the dummy head;
• conducting and recording the test with high speed photographic cameras;
• tracking the marker stickers fixed on head and torso extension brackets after the test to compute their position in space throughout the test event;
• establishing the angular positions of the head & shoulder by geometrical computations using coordinates of minimum 2 marker stickers one each on head & the torso extension bracket;
• computing further rotation of the head relative to the torso by simple subtraction of their respective inclinations within the photographic frames.
BRIEF DESCRIPTION OF INVENTION
An extension bracket for torso of a hybrid 3 50th percentile crash test dummy consist of a transverse plate fixed at the shoulder. Longitudinal extensions attached to either end of the transverse extension plates for fixing the marker sticker.
A method for computing the rotation of head with respect to shoulder of a crash test dummy comprising of:
Said torso extension bracket comprising transverse plate, pair of longitudinal extensions at both ends; spacer and pair of first mounting fasteners for mounting the transverse plate with the shoulder structure & second mounting fastener for connecting the said longitudinal extension to the said transverse plate.

Said extension plate is attached to the shoulder through pair of holes and the longitudinal extensions being attached at its end at the slot, in such a way that the axis of said transverse plate is eccentric to said mounting holes.
A projection being provided at one end of the said longitudinal extensions to suit its fitment with said slot on said transverse plate.
The width of the other end of the said longitudinal extension is wide enough to
accommodate the said marker stickers.
at least one marker stickers fixed on head of said crash test dummy,
The marker stickers fixed on head and torso extension brackets are tracked to compute
their position and angular positions in space throughout the test event using
coordinates of marker stickers on head & the torso extension bracket.
The rotation of the head relative to the torso is computed by subtraction of their respective inclinations within the photographic frames.
BRIEF DESCRIPTION OF DRAWINGS
According to the present invention,
Figure - 01 shows side view of a hybrid 3 50th percentile crash test dummy fitted with
the torso extension brackets in a test set up in accordance with the present invention,
Figure - 02 shows side view of chest of a hybrid 3 50 percentile.
Figure - 03 & 04 show side & front views of chest of a hybrid 3 50th percentile
without the shoulder jacket.
Figure - 05 shows contents of the torso extension bracket.
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.

According to present application an embodiment in Figure 01 shows a crash test dummy (1) is fitted with the torso extension bracket (2). The figure also shows the marker stickers (3), used for photographic references, fixed on head & the said torso extension brackets.
Figure 02 shows side view of chest of crash test dummy of embodiment shown in figure 01. It shows the said torso extension bracket (2), torso jacket (1.1) for the said dummy & the said marker stickers (3) fixed to the said torso extension bracket.
Figure 03 shows the side view of chest of a dummy fitted with the said torso extension brackets but without the said torso jacket. It additionally shows the shoulder (1.2) & rib cage (1.3) of the dummy.
Figure 04 shows front view of chest of crash test dummy with the said torso extension bracket. It also shows the parts of the torso extension bracket. It shows the transverse plate (2.1), pair of longitudinal extensions (2.2) & pair of mounting fasteners (2.3) of the said torso extension bracket.
Figure 05 shows details of the said torso extension bracket. It shows the transverse plate (2.1), pair of longitudinal extensions (2.2), spacer (2.4), pair of first mounting fasteners (2.4) for mounting the transverse plate with the dummy shoulder structure & second mounting fastener (2.5) for connecting the said longitudinal extension to the said transverse plate.
Figure 06 shows the transverse extension plate. The said extension plate is attached to the shoulder through the pair of holes (2.1.3) & the longitudinal extensions are attached at its end at the slot (2.1.2). The axis of the said transverse plate is eccentric (2.1.1) to the said mounting holes to avoid fouling with the shoulder structure. The width of the said slot is also controlled to ensure appropriate fit with the said longitudinal extensions. The said transverse plate has also been provided with pair of threads (2.1.4) to fit the attachment fasteners for the said longitudinal extensions.

Figure 07 shows the details of the said longitudinal extensions. A projection (2.2.1) has been provided at one end of the said longitudinal extensions to suit its fitment with the said slot (2.1.2) on the said transverse plate. The width of the other end of the said longitudinal extension is wide enough to accommodate the said marker stickers.
For conducting the whiplash assessment test, a dummy is prepared as follows. The dummy head, neck, hands & dummy jacket are removed. The shoulder attachment fasteners are removed. The transverse plate is then inserted to the shoulder structure with the spacers. The said transverse plate and shoulder structure are together attached to the chest structure by longer mounting bolts. The dummy jacket is put on the dummy. The longitudinal extensions are connected on either end of the transverse plate. Hands, neck & head are fitted back to the dummy. The dummy is placed on the test sample seat. Appropriate marker stickers are fixed on the longitudinal extensions as well as on the dummy head. The test is conducted & the test is recorded with high speed photographic cameras. After the test, the marker stickers fixed on head & torso extension brackets are tracked to compute their position in space throughout the test event. Using coordinates of minimum 2 marker stickers each on head & the torso extension bracket, the angular positions of the head & shoulder are established by geometrical computations. Further rotation of the head relative to the torso is computed by simple subtraction of their respective inclinations within the photographic frames.
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.

WE CLAIM
1. Torso extension bracket for crash test dummy for photographic reference
comprising of
at least one transverse extension plate;
at least one pair of longitudinal extensions plate;
at least one spacer and at least one pair of mounting fasteners;
at least one marker sticker adapted for tracking and computing positions.
2. The bracket as claimed in claim 1 wherein said transverse extension plate is mounted on dummy shoulder structure with a pair of first mounting fasteners through the mounting holes.
3. The bracket as claimed in claim 2 wherein the axis of said mounting plate is eccentric as compared to the axis of said mounting holes adapted to avoid fouling with shoulder structure.
4. The bracket as claimed in previous claims wherein at least one slot is provided at the end of the said torso extension plate to suit location of said longitudinal extensions.
5. The bracket as claimed in previous claims wherein the said longitudinal extensions have been provided with at least one extension to suit the locating slot provided on the said transverse extension plate,
6. The bracket as claimed in previous claims wherein said transverse extension plate is provided with a pair of threads for mounting said secondary mounting fasteners through said longitudinal extensions.

7. The bracket as claimed in previous claims wherein the width of other end of said longitudinal extension is provided with sufficient width for accommodating and mounting marker stickers.
8. The bracket as claimed in previous claims wherein width of said slot is controlled for ensuring appropriate fitting with said longitudinal extensions.
9. The Method of preparing dummy and performing crash test with said torso extension bracket mounted on said crash test dummy for photographic reference comprising the steps of

• preparing a dummy by removing the dummy head, neck, hands and dummy jacket;
• removal of the shoulder attachment fasteners to insert the transverse plate to the shoulder structure with the spacers;
• attachment of the said transverse plate, spacer and shoulder structure together to the chest structure by longer mounting bolts;
• putting said dummy jacket on the said dummy;
• connecting the longitudinal extension on either end of the transverse plate;
• fitting of hands, neck and head back to the dummy;
• placing said dummy on the test sample seat;
• fixing of appropriate marker stickers on the longitudinal extensions as well as on the dummy head;
• conducting and recording the test with high speed photographic cameras;
• tracking the marker stickers fixed on head and torso extension brackets after the test to compute their position in space throughout the test event;
• establishing the angular positions of the head & shoulder by geometrical computations using coordinates of minimum 2 marker stickers each on head & the torso extension bracket and;

• computing further rotation of the head relative to the torso by simple subtraction of their respective inclinations within the photographic frames.
10. The Torso extension bracket for crash test dummy for photographic reference and the method of preparing dummy and performing crash test substantially as herein described in description as illustrated with reference to accompanying drawings.