Common Accelerator-Brake Pedal

  Use Same pedal as brake and Accelerator  
  Patent application no. -  225/BOM/98  

The common accelerator brake Pedal is for automatic transmission vehicles since these vehicles does not require clutch pedal. Common Accelerator brake pedal is only one Pedal to perform two functions of accelerator and brake.

  Invention (What is New)  

The pedal is built so that an un-pressed Pedal (released fully) apply full brakes of the vehicle remains stationary. A half pressed pedal releases the brakes completely. The pedal starts working as accelerator when pressed past half position.  (Automatic Transmission or Auto Gearshift vehicles).

  Accelerator Pedal Pedal 2
Diagram II, III & IV
  In the Diagram Above, '1' is a master cylinder of the brakes system. '2' is a piston operating inside the cylinder, '3' is a connecting rod that connect brake with the pedal. A spring '4' fitted on the body of vehicle keeps pedal upward (Brakes Applied) position when un pressed.

Shaft '3' move freely through the guide '5'. A spring '4' has enough tension to fully apply the brakes in pushed condition.

Pedal '9' (not shown complete in the diagram) moves around axis '14'. The Pedal is fitted with a cam at it's axis. The cam rotates with the Pedal around axis. Cam is shown as '8'.

The cam has a groove ('7') along periphery. A follower '6' moves along groove on the cam following the movements of cam. Follower is attached to shaft '3'. The shape of cam '8' is as shown in the diagrams II, III, and IV below.

When Pedal is un-pressed, the brakes are applied completely (position A). As the Pedal is pressed, cam moves around axis and the follower climbs up gradually releasing the brakes as the piston in the master cylinder is pulled out.

When Pedal is half pressed, the follower climbs the distance equal to the radius of the cam and brakes are released fully. Thus till half pressed position, Pedal is used as a brake Pedal.
As the Pedal is pressed further, brakes remain released due to semicircular shape of cam ‘8’ and follower remains steady.

The movement of Pedal moves limb '15' around axis '14'. When Pedal is pressed more than half pressed position the limb '15' is connected with the accelerator '11' and accelerator is pulled with the movement of the Pedal. Thus the Pedal works as accelerator when pressed past half position.

As Pedal is released it moves toward its normal position and the accelerator is set to the idle position.

Further releasing of the Pedal disengages the accelerator '11' from limb '15' and follower '6' climbs down and starts applying brakes.
  Thus one Pedal is used for two functions of accelerator and brake (automatic transmission vehicle). The Pedal operates with both the functions in mutually exclusive way