FORM 2
THE PATENT ACT, 1970,
(39 OF 1970)
&
THE PATENTS RULE, 2003
PROVISIONAL SPECIFICATION
(SEE SECTION 10; RULE 13)
"AN EFFORTLESS CHECK ARM FOR THE VEHICLE DOOR"
MAHINDRA & MAHINDRA LIMITED
AN INDIAN COMPANY,
R&D CENTER, AUTOMOTIVE SECTOR,
89, M.I.D.C, SATPUR,
NASHIK - 422 007,
MAHARASHTRA, INDIA.
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED

FIELD OF THE INVENTION:-
The present invention is related to the automotive body systems. More particularly the present invention is related to the check arm of the vehicle door wherein the said check arm provides the minimum closing effort.
BACKGROUND OF INVENTION:-
The check arm in vehicle door closing system is known as shown in the figure 1 of accompanying drawing. It is observed that the one end of check arm fixed to the body of vehicle is having two pair grooves opposite side and at distant a check house fitted to the door provided with a spring biased ball in the groove, while opening door balls enters the far end grooves on check arm and while closing door the balls enter the near end grooves. It is observed that the door closing and opening is not smooth requires more effort. The failure of spring or worn out of grooves makes totally non functioning door. The present invention is a solution to the type of check arm.
OBJECTION OF INVENTION:-
It is object of invention to provide a check arm to vehicle door system for effort less smooth opening and closing of door.
It is another object of invention to provided non mechanical means to check arm for control of opening closing so as to avoid wear and tear of check arm part.
It is another object of invention to provide check arm with magnet means for control of opening and closing of vehicle door.
It is also another object of invention to provide a check arm having improved ergonomic of the operation.

STATEMENT OF INVENTION:-
Accordingly the invention provides an effortless check arm for the vehicle door comprises a check arm, fitted to the body of vehicle, provided with a first pair of magnets held by pivoted a pair cross arms with a spring sand witched therein and located on the said check arm to get desired opening of vehicle door; a check house fitted to the door provided with a second magnet having a side slot for passing of said magnet holding arms with a reduced width of the slot, at location adjacent to the said magnet of check house, to enable to press the said spring biased arm to make the said magnet closer together; the arrangement of said check hose is such that while opening the door the said magnet in the check house passes first through the check arm magnet followed by the slots in the check house and while door closing the slot in the check house passes first through the check arm magnet followed by the check house magnet.
BRIEF DESCRIPTION OF THE FIGURES:-
Figure 1 shows the conventional check arm system available in the prior art.
Figure 2 shows check arm with check house in accordance with the present invention.
Figure 3 shows another view of check arm of the present invention without the check housing.
Figure 4 shows the magnetic portion of check arm in accordance with the present invention.
Figure 5 shows the exploded view of check housing with the mounting locations.

DESCRIPTION OF THE PRESENT 1NVENTION:-
In prior art as illustrated in figure 1 a check arm is used to control the opening motion of door. The check arm what we are currently using which is shown above have detents or groove (G) at a desired position to stop the door while opening at that position for specific function. But during closing due to those grooves (G), the closing effort of the door is increased which is not desired. Some other problems related to the current system is that, if the spring(S) in the system fails then the whole system fails. The design of check arm and the check house (HD) is also complex in the current system.
The present invention solves the problem related to the current system as illustrated in figures 2 to 5. The above model consists of two magnets one in the check arm which is fitted to the body and another one in the check house which is fitted to the door. While closing the door, when the check house magnet comes near the check arm magnet, due to the attractive force between those magnets the door stops in that position. With the help of the magnets we can stop the door at the desired position during opening. The slot provided in the check house press the magnetic holding arm as it pass through it. While opening the door, magnet in the check house passes first through the check arm magnet followed by the slots in the check house.
Referring to figure 2 an effortless check arm for the vehicle door , according invention comprises a check arm 1 fitted to the body of vehicle provided with a first pair of magnets 3 held by pivoted at pivot 10 a pair cross arms with a spring 7 sand witched therein The location of the said magnet in check arm as per the opening angle door of vehicle . As illustrated in figure 4 the said first magnets 3 at distant separated a spring in between and clamped by magnet holding arms, is illustrated in figure 4 A check house 2 fitted to the door provided with a second magnet 5 having a side slot for passing of said magnet holding arms with a reduced with of the slot 8 in location adjacent to the said magnet 5 of check house so as to press spring 7 biased arm to make the said first magnets 3 closer together. The arrangement is made such that While opening the door the said magnet 5 in the check house passes first through

the check arm magnet 5 followed by the slots 8 in the check house and while door closing the slot in the check house passes first through the check arm magnet 3 followed by the check house magnet 5.
The said check arm 1 is a hollow rectangular/square cross section longitudinal member having side opening for fitting the said magnet holding pivoted arms 9 biased by a dampener spring 7 held between said magnets.
The check arm 1 is fitted to the vehicle body by a U- bracket 4 attached at end.
While vehicle door closing the slot 8 in the check house 2 passes first through the check arm magnet 3 followed by the check house magnet 5. Due to this movement, both the magnet holding arm is pressed which makes those check arm magnet 3 to come closer to each other and the distance between them to the check house magnet 5 is increased. Since dampener spring 7 is used in between those check arm magnets 3, the spring 7 slowly releases the energy. By that time the check house magnet 5 passes the check arm magnet 3 during door closing. Due to this, the magnetic force between the check house 2 and the check arm magnet 3 is reduced which ultimately reduces the closing effort of the door. But during door opening the magnet 5 in the check house passes first through the check arm magnet 3 followed by the slot 8 in the check house. During door closing the reverse takes place.
Ceramic permanent magnets can be used. Cobalt based magnet can also be used but it is costlier compared to ceramic permanent magnets. Ferrite based permanent magnet can also be used. But the disadvantage is that it is very fragile and expensive tooling is required to manufacture it. Check arm can be made up of Noryl material. It can also be made up of nylon material. Body mounting bracket can be made up of steel. The check house can be made up of steel. Dampener spring is made up of spring steel.
The technical advantages achieved by this invention are: The present invention imparts the reduced door closing efforts during the operation. The oscillatory motion (jerk) while opening the door is eliminated which increases the customer

comfort. Ergonomic of the operation is improved. Magnetic energy is used rather than groves in the check arm.

WE CLAIM:-
1. An effortless check arm for the vehicle door comprises a check arm, fitted to the body of vehicle, provided with a first pair of magnets held by pivoted a pair cross arms with a spring sand witched therein and located on the said check arm to get desired opening of vehicle door; a check house fitted to the door provided with a second magnet having a side slot for passing of said magnet holding arms with a reduced width of the slot, at location adjacent to the said magnet of check house , to enable to press the said spring biased arm to make the said magnet closer together; the arrangement of said check hose is such that while opening the door the said magnet in the check house passes first through the check arm magnet followed by the slots in the check house and while door closing the slot in the check house passes first through the check arm magnet followed by the check house magnet.
2. An effortless check arm for the vehicle door as claimed in claim 1 wherein the said check arm is a hollow rectangular/square cross section longitudinal member having side opening for fitting the said magnet holding pivoted arms biased by a dampener spring held between said magnets.
3. An effortless check arm for the vehicle door as claimed in claims 1 and 2 wherein the check arm is fitted to body by a U- bracket attached at end.
4. An effortless check arm for the vehicle door as claimed in claims 1 to 3 wherein the said magnets are permanent magnets of ceramic or cobalt based or ferrite based.
5. An effortless check arm for the vehicle door as claimed in claims 1 to 4 wherein the said check arm is made of Noryl or nylon material.
6. An effortless check arm for the vehicle door as claimed in claims 1 to 5 wherein the said check house is made of steel.

7. An effortless check arm for the vehicle door as claimed in claims 1 to 6 wherein the said damper spring made of spring steel.