Patent GB-506334-A (GB)
Title: Improvements in or relating to brake structures
IPC: F16D65/22
Filed: 1937-10-22
Abstract: 506,334. Brakes. GOODRICH CO., B. F. Oct. 22, 1937, No. 28872. Convention date, March 26. [Class 103 (i)] The pressure transmitting wall of an expansible tube for applying braking pressure to the friction elements of a brake comprises stiffening means whereby the pressure is transmitted simultaneously across substantially the entire width of the wall or the normal flat condition of the wall is maintained. The brake may comprise a number of spaced tubes. An expansible tube 23, Figs. 1, 5 is disposed,in a channel formed in a member 10 bolted at 11 to a non- rotatable shaft 13, the inner wall of the channel being provided by a ring 22 detachably secured to the member 10. Friction elements 26 adapted to be applied to a drum 16 secured to an aircraft or other wheel 14 mounted by bearings 15 on the shaft 13, when pressure fluid is supplied to the tube 23 through a connection 25, are guided radially by projections 28 engaging slots in the elements. Leaf springs 30 for retracting the elements are received in slots in adjacent ends of a pair of elements and at their ends in sockets 31 in the members 10, 22, The elements 26 may be of moulded composition with a reinforcement 32 of textile material, perforated metal, &c. The springs may be of highly polished metal to protect the tube 23 between the elements 26 from heat radiation. The tube 23 may comprise an inner tube 33, Fig. 2 of rubber, a complete covering 34 of bias laid fabric, a reinforcing layer of stiff fabric 35 or circumferentially arranged cords, across the outer wall and a layer 36 of heat resistant rubber on the outer face or surrounding the entire tube. The outer wall thus transmits pressure to the friction elements 26 simultaneously across the entire width and is maintained flat. To provide for maximum radial displaceability of the outer wall without consequent narrowing of the tube the margins of the inner part 33 may in the normal condition be upturned. When mineral oil is used as the pressure fluid, a rubber-like material resistant thereto such as plasticized polymerized vinyl chloride or neoprene compositions are substituted for the rubber. A local depression 20a at the entrance of the pipe connection 25 or a shallow continuous central groove may be provided in the member 10 or in the tube itself so that the walls of the tube remain spaced at this part to facilitate entry and drainage of the pressure fluid. The lugs 28, Fig. 5, may be dispensed with and the braking torque be transmitted to the member 10 by the springs 30. Fig. 11 shows a construction in which the braking torque on the friction elements 68 is transmitted to the fixed member 60 through the expansible tube 65 which is anchored to the member 60 by projections 66, the tube having an outer layer in contact with the elements 68, which layer besides resisting non-uniform expansion of the tube across its width has a high coefficient of friction and is made of rubber or elastic material and-may contain asbestos or other heat-resisting material. The lugs 28 and springs 30 are dispensed with in this case and the elements are retracted by coil springs 69 extending around the brake in grooves in the edges of the elements. The series of elements may be replaced by a single continuous element. Fig. 7 shows a pair of tubes 45 each applying a series of friction elements 46 to a common drum 53, the tubes being supplied through a common passage 50.