Stroke limiting means for friction clutch pressure piston in a s

Details Stroke limiting means for friction clutch pressure piston in a s Stroke limiting means for friction clutch pressure piston in a s

1988-03-10

1989-07-25

Jones, David

Metal deforming

With means to drive tool

Including screw-actuated tool support

7245301, 72 31, 100289, B21J 918

Patent

active

048502154

ABSTRACT:
A screw press has a friction clutch for coupling the driving flywheel to the press spindle. The clutch is engaged by a hydraulic piston. To maintain a constant piston stroke as the friction clutch wears, a metering piston and cylinder are interposed between the clutch operating piston and the pressure fluid supply to trap pressure fluid in the clutch operating cylinder and to top it up as required, so that the operating piston stroke corresponds essentially to the fixed stroke of the metering piston. Fluid flow to the operating cylinder bypassing the metering piston is controlled by a normally closed valve arranged to be opened positively in dependence on the position of the metering piston, as the metering piston approaches the end of its stroke in the direction for pressurizing the clutch operating piston to engage the clutch. This arrangement ensures that the clutch cannot be inadvertently locked in an engaged condition.

REFERENCES:
patent: 4181003 (1980-01-01), Kononov et al.
patent: 4563889 (1986-01-01), Landwehr
patent: 4590787 (1986-05-01), Trimborn
patent: 4606217 (1986-08-01), Schiller et al.

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