Patent GB-352009-A (GB)
Title: Improvements relating to friction brakes for internal combustion engines
IPC: F16D49/16
Filed: 1930-03-24
Abstract: 352,009. Brakes. PETTY, T., Dormin, Greta Avenue, and TAYLERSON, T., 41, Richard Street, both in West Hartlepool, and RICHARDSONS, WESTGARTH & CO., Ltd., Hartlepool Engine Works, Hartlepool. March 24, 1930, No. 9355. [Class 103 (i).] Applied by engine controlling appliances ; forcetransmitting mechanism; fluid pressure.-In a brake block arrangement for facilitating the manoeuvring of an internal-combustion engine the act of bringing the manoeuvring gear back to " stop " shuts off the fuel supply and at the extreme end of this operation removes an initial restraint against operation of the brake and allows its operation by fluid pressure automatically or by hand, also the manoeuvring gear cannot be brought back to starting position unless the brake is off. The main control wheel which regulates the admission of air and fuel to the engine and is rotated in one direction for starting ahead and the other direction for starting astern operates a cam 7 which maintains the control cock 2 in such a position that air is discharged from the brake cylinder through a silencer 6 and the brake released until the control wheel is moved to the stop position when a depression 8 comes under a roller 9 on a lever 10 connected to the lever 3 of the cock 2 and allows the cock to be moved to " brakes on " position, when the brake cylinder o is connected through a pipe 5 and a reducing valve 4 to a source of compressed air such as the starting bottles. If the control wheel is moved from the " stop" position while the brake is applied the lever 10 is moved to release the brake. The cam may be replaced by a disc or segment having in the " stop " position a hole opposite a locking plunger connected to the cock handle. The brake may be taken off by the action of a spring on the control handle so that it must be held in the brake " on " position. In engines having separate fuel and air controls, these controls are interlocked so that the brake can only be applied in the " stop " position of the fuel control and the air " off " position. The brake piston is connected to a pair of levers d on which one brake block a is mounted and the cylinder is mounted by means of trunnions on a pair of levers j connected by a rod v to a pair of levers e carrying the other brake block a. The brake blocks engage the stops x in released position. Spring friction devices are applied at the pivots of the blocks. To ensure balanced application of the blocks the distances between the pivot pins f u and k, mare equal, the distances between the pins f, p and k, n are equal and the distances between the pins f, c on both levers d, e are equal. Modified arrangements of the levers are shown, in one of which the cylinder is mounted at the top of one lever and connected to the top of the other lever by a rod so that inward movement of the piston applies the brake. In a modification of this arrangement outward movement of the piston applies the brake. The pins on which the brake blocks are mounted may be mounted on sliding members sliding in guides in place of levers. A modification is shown in which a single brake block is used.