FIELD OF THE INVEJN TWJJX: This invention relates to "Self Activated Power Brake". BACKGROUND OF THE INVENTION:

The existing power brakes in automobiles, industries, railways etc. are activated by externally generated power through electric motor, hydraulic pump, air compressor or some other means. The power brake system is needed to assist or ease the driver of the vehicle or operator of the machine, as it requires a lot of power to stop any heavy moving object. This existing facility increases cost like the cost of electric motor, hydraulic pump or air compressor and running cost of the system too. In every braking system in a machine external force is required to stop or slow down the rotating wheel or any part of the machine, making the system as a whole more complicated and bulky.

OBJECT OF THE INVENTION:

Object of this invention is to obviate the above drawbacks by providing a "Self Activated Power Brake".

SUMMARY OF THE INVENTION:

To achieve the said objective, this invention provides A Self Activated Power Brake comprising:

- a rotating disk/drum coaxially fitted to a wheel, - a housing to hold brake shoes of a brake in a fixed position with respect to the rotating disk/drum,

- a brake pedal system to transmit motion generated by hand or foot to at ^• least one actuating pilot caliper,

- said pilot caliper is attached to at least one actuating mechanism, which actuates said brake shoes.

The actuating mechanism comprising:

- at least one linkage mechanism to link said pilot caliper to at least one transmitting means so that force from pilot caliper can be transmitted to said transmitting means,

- said transmitting means to apply force on at least one engaging means,

- at least one engaging means to engage said brake shoes to said rotating disk/drum when force is applied.

The pilot caliper comprising:

- at least one engaging brake shoe to engage to said rotating, disk/drum when motion is transmitted from said brake pedal system,

- a movable holding frame to hold said engaging brake shoes. The brake is a disc brake, a drum brake, a hydraulic brake, a pneumatic brake or a railway mechanical brake.

The linkage mechanism is either a mechanical link or a sliding piston arrangement. The transmitting means is at least one lever system or at least one V shaped slot or at least one master cylinder hydraulic system.

The engaging means is at least one sliding piston arrangement or at least one V shaped protrusion or at least one hydraulic sliding piston arrangement.

The actuating mechanism is of oval shape so that when said pilot caliper engages to said drum brake, said oval shaped actuating mechanism tilts and engages the brake shoes by at least one mechanical means (E5). The actuating mechanism is of eye shape so that when said pilot caliper engages to said drum brake, said eye shaped actuating mechanism tilts and engages the brake shoes by hydraulic means (E6).

The pilot caliper engages to said disc brake and actuates said linkage mechanism, which further transmits force to said transmitting means so that it enables the engaging means to engage the brake shoes to said rotating disk/drum.

BRIEF DESCRIPTION OF THE INVENTION: The invention will now be described with reference to accompanying drawings:,

Fig.l shows the sectional view of "Self Activated Power Brake" for disc brake with mechanical lever. Fig.2 shows the sectional view of "Self Activated Power Brake" for disc brake with V shaped arrangement.

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Fig.3 shows the sectional view of "Self Activated Power Brake" for disc brake with two V shaped arrangement.

Fig.4 shows the sectional view of "Self Activated Power Brake" for disc brake with hydraulic arrangement.

Fig.5 shows the side view of "Self Activated Power Brake" for drum brake with mechanical arrangement. Fig.6 shows the side view of "Self Activated Power Brake" for drum brake with hydraulic arrangement.

Fig.7 shows the side view of "Self Activated Power Brake" for disc brake with V shaped arrangement.

Fig.8 shows the side view of "Self Activated Power Brake" for disc brake with hydraulic arrangement.

Fig.9 shows the sectional view of Pilot Caliper of "Self Activated Power Brake".

Fig.10 shows the perspective view of "Self Activated Power Brake" for railways.

DETAILED DESCRIPTION OF THE INVENTION: Referring to the drawings Self Activated Power Brake is made up of a rotating disk/drum (A) coaxially fitted to a wheel (not shown in figures). A housing (F) to hold brake shoes (G) of a brake is provided in a fixed position with respect to said rotating disk. A brake pedal system connected to hydraulic light pressure line (N) to transmit motion generated by hand or feet to at least one actuating pilot caliper (B). Said pilot caliper (B) is attached to preferably one actuating mechanism, which actuates said brake shoes (G). The actuating mechanism has preferably one linkage mechanism (M) to link said pilot caliper to at least one transmitting means, so that force from the pilot caliper can be transmitted to said transmitting means. Said transmitting means applies force on at least one engaging means, when force is transmitted. Said engaging means, engages said brake shoes (G) to said rotating disk (A) when force is applied. The pilot caliper (B) is made up of at least one engaging brake shoe (P) to engage to the rotating disk, when motion is transmitted from said brake pedal system and a movable holding frame (Q). Said linkage mechanism consists of a pilot caliper having sliding piston (C) connected to pilot caliper (B) at one end and said actuating mechanism at other end.

Figure 1 shows Self Activated Power Brake for disc brake with mechanical lever according to one 'embodiment of the present invention. In this embodiment

8 actuating mechanism is a mechanical lever system (Dl) with two flexible L ship^cP- ^ levers (Ll and L2) so that when actuating mechanism is actuated said levers (Ll and L2) push engaging means (El) so as to engage the brake shoes (G) to the rotating disk (A).

Fig.2 shows Self Activated Power Brake ¹ for disc brake with V shaped arrangement according to one embodiment of the present invention. In this embodiment actuating mechanism is an arm (D2) with a V shaped slot so that when actuating mechanism is actuated said V shaped slot moves and pushes V shaped protrusion of engaging means (E2) so as to engage, the brake shoes (G) to the rotating disk (A). Alignment and centering is done by main brake housing on mounted pin (H).

Fig.3 shows Self Activated Power Brake for disc brake with two V shaped arrangement according to one embodiment of the present invention. In this embodiment actuating mechanism is an arm (D3) with two V shaped slot so that when actuating mechanism is actuated said V shaped slot moves and pushes both V shaped protrusion of engaging means (E3) so as to engage the both brake shoes (G) to the rotating disk (A) uniformly from both sides so wear and tear in both the brake shoes are uniform. This principle can be used in other embodiments as well. Alignment and centering is done by adjusting screws (J3 and K3).

Fig.4 shows Self Activated Power Brake for disc brake with hydraulic arrangement according to one embodiment of the present invention. In this embodiment actuating mechanism is a master cylinder (D4) so that when actuating mechanism is actuated said master cylinder applies pressure on hydraulic sliding piston (E4) so as to engage the brake shoes (G) to the rotating disk (A).

Figl5 shows Self Activated Power Brake for drum brake with mechanical arrangement according to one embodiment of the present invention. In this ^■ embodiment actuating mechanism is an oval shaped arm (D5) so that when actuating mechanism is actuated said oval shaped arm moves and pushes concave shaped engaging means (E5) so as to engage the brake shoes (G) to the rotating disk (A). Tension spring (I) is connected to said brake shoes (G) to keep them untouched to the drum in ideal condition. Gap adjusting arrangement (H) is provided to adjust gap between said shoes (G) and said drum (A).

Fig.6 shows Self Activated Power Brake for drum brake with hydraulic arrangement according to one embodiment of the present invention. Engaging brake shoe (P) is connected to two sliding piston cylinders (C) connected to hydraulic pressure line (N) to engage with the rotating drum (A). In this embodiment actuating mechanism is an eye shaped arm (D6) so that when actuating mechanism is actuated said eye shaped arm tilts and pushes engaging means (E6) so as to build up pressure in hydraulic master cylinders (R) which further build up pressure in

main hydraulic cylinder (K) to engage the brake shoes (G) to the rotating drum (A). Tension spring (I) is connected to said brake shoes (G) to keep them untouched to the drum in ideal condition. Gap adjusting arrangement (H) is provided to adjust ' gap between said shoes (G) and said drum (A).

Figure 10 shows Self Activated Power Brake for disc brake with mechanical lever according to one embodiment of the present invention for railways. In this embodiment actuating mechanism is a mechanical lever system (DlO) so that when actuating mechanism is actuated engaging means (ElO) engages the brake shoes (G) to the rotating disk (A).

Said Self Activated Power Brake can be used in a disc brake, a drum brake, a hydraulic brake or a pneumatic brake or mechanical brakes of railways. Force applied by the brake shoes on the disc/drum is multifold of the force applied by the driver/operator on the brake pedal as the pilot caliper generates the actual force for the brake shoes. Again as the actual force is generated by the pilot caliper, when rotating disk/drum is stopped completely said force becomes zero and the main brake shoes are released from the disk. Although the invention has been described with reference to specific embodiments, this description is not meant to be construed in a limiting sense. Various modifications of the disclosed embodiments, 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 spirit or scope of the present invention as defined.