Brakes – Operators – Fluid pressure
Patent
1994-07-27
1999-06-01
Graham, Matthew C.
Brakes
Operators
Fluid pressure
F16D 5532
Patent
active
059080922
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
This invention relates to fluid operated brake devices, such as are employed industrially for example in papermaking and related fields.
Such brake devices typically comprise a brake disc secured to a rotatable shaft which is to be braked and against which brake pads are selectively engaged by pneumatically powered actuators. For protection, operative parts of such a device are enclosed in a housing which must allow convenient access to the operative parts for servicing. The invention is accordingly concerned with the provision of a fluid-operated brake device having a housing which facilitates safe and convenient servicing of the device.
Thus from EP-A-0 219 938 there is known a brake device of the kind having fluid-operated actuator means for applying a braking force, the brake device comprising a housing having first and second parts which are relatively displaceable from a closed position to permit access to at least a part of the housing interior, a pressure fluid connection element at the housing exterior for connection with a source of pressure fluid, and passage means communicating the pressure fluid connection element with the actuator means.
In accordance with the invention there is provided a brake device of this kind in which the passage means are in the first and second housing parts and include separable cooperating connectors located on the first and second housing parts respectively so that displacement of the housing parts effects disconnection of the actuator means from the pressure fluid source.
A non-return valve upstream of the air supply connection between the two housing parts, and arranged to be held open when the parts are assembled, can be provided.
Considerable heat can be generated frictionally within the housing of a fluid operated brake device and an electric cooling fan can be incorporated in the housing. In this event, the electric power supply can be carried through the separable housing parts in a similar way so that access to the fan cannot be obtained without its being isolated from its power supply.
The invention is further described below, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a perspective view of a brake device, including a two-part housing, in accordance with the invention;
FIG. 2 is a sectional side view of the brake device of FIG. 1;
FIGS. 3 & 4 are partial perspective views, from different viewpoints, of connector portions of the two parts of the brake device housing after separation.
The illustrated brake device 10 comprises a two-part housing having a rear part 11 and a front part 15. The housing interior accommodates a brake disc received secured to a shaft extending into the housing, to which braking pressure is to be applied. Pneumatic actuators are mounted within the housing on the front part 15, for selective actuation to applied braking pads to the brake disc. Such brake mechanisms are known and are therefore not further described. For details of an exemplary mechanism of this kind, reference may be made to EP 0 219 938.
The housing rear part 11 has the shape of an axially short cylinder except for a connector portion 12 extending radially outwardly, as shown at the right in FIG. 1. The outer or front part 15 of the housing is generally similarly shaped, with a radially outwardly extending connector portion 16 overlying the portion 12, but has a frustoconical portion 17 converging forwardly to a front plate 19.
The operation of the braking mechanism within the housing generates substantial heat, and the device 10 incorporates positive cooling means in the form of an electrically powered fan 20 mounted in the front part 15. The fan comprises an electric motor driving an impeller vane assembly to rotate about the axis of the housing, so as to draw in cooling air from the outside through a grill 14 provided in the front plate 19.
The rear and front housing parts 11 & 15 are releasably secured together by bolts 25 extending through holes extending through the side wall of the front housing part into t
REFERENCES:
patent: 2510125 (1950-06-01), Meakin
patent: 4754993 (1988-07-01), Kraynick
patent: 4982736 (1991-01-01), Schneider
Dommett Simon Paul
Pearson Barry
Walter David Thomas
Graham Matthew C.
Wichita Company Limited
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