Release system, particularly for releasing hydraulic actuators for automatic openings

Abstract

A release system, particularly for releasing hydraulic actuators for automatic openings having an articulated arm for swing-door gates, provided in a hydraulic circuit having a hydraulic pump (3), operated by a reversible motor, two cylinder-piston elements (6, 7), alternatively receiving hydraulic liquid (L) from the hydraulic pump (3) through two tubes (4, 5), a valve (9, 10) being provided along the tubes (4, 5), between each cylinder-piston element (6, 7) and the hydraulic pump (3), preventing the return of the hydraulic liquid toward the hydraulic pump (3), the return being permitted only by an inverse rotation of the pump (3) operation motor, the system being characterized in that a normally closed manual opening-closing elements (11) being provided along the tubes (6, 7), connected in parallel with respect to the pump (3).

Description

The present invention will be now described, for illustrative but not limitative purposes, according to its preferred embodiments, with particular reference to the figures of the enclosed drawings, wherein:

FIG. 1 schematically shows a hydraulic circuit according to the prior art;

FIG. 2 is a second schematic view of a hydraulic circuit according to the prior art;

FIG. 3 schematically shows a hydraulic circuit with the device according to the invention; and

FIG. 4 is a second schematic view of a hydraulic circuit with the device according to the invention.

Claims

1. Release system, particularly for releasing hydraulic actuators for automatic openings having an articulated arm for swing-door gates, provided in a hydraulic circuit having a hydraulic pump, operated by a reversible motor, two cylinder-piston elements, alternatively receiving hydraulic liquid from said hydraulic pump through two tubes, a valve being provided along said tubes, between each cylinder-piston element and the hydraulic pump, preventing the return of the hydraulic liquid toward the hydraulic pump, said return being permitted only by a inverse rotation of the pump operation motor, said system being characterised in that, a normally closed manual opening-closing means is provided along said tubes, connected in parallel with respect to said pump.

2. Release system, particularly for releasing hydraulic actuators for automatic openings according to claim 1, characterised in that said normally closed manual opening-closing means is comprised of a manual cock.

3. Release system, particularly for releasing hydraulic actuators for automatic openings according to claim 1, characterised in that said normally closed manual opening-closing means is provided in a protected position.

4. Release system, particularly for releasing hydraulic actuators for automatic openings according to claim 3, characterised in that said normally closed manual opening-closing means is provided within a housing having a door that can be open by lock or other system permitting its opening only by authorised personnel.

5. Release system, particularly for releasing hydraulic actuators for automatic openings according to claim 2 characterised in that said normally closed manual opening-closing means is provided in a protected position.