FR2631073A1 - Device for the automatic opening and closing of doors or gates - Google Patents

Abstract

The invention relates to a device for the automatic opening and closing of doors or gates with two leaves, which is characterised in that it uses glycol-containing water as a single control fluid and in that it comprises, in combination: a) a low-pressure central pressure and control unit 1; and b) two pneumatic jacks 6 and 7 intended for opening and closing the two leaves 10 and 11; c) conduits 12 and 13 connecting the central unit to the jacks and made of plastic.

Description

 The invention relates to devices for automatically opening and closing doors or gates with two leaves.

 The known devices of the kind in question are of three types (1) those using mechanical housings, with integrated geared motor, associated with articulated arms connected to the leaves; (2) those using hydraulic cylinders, with incorporated central unit, or electric worm screws, interposed between the pillars and the leaves; (3) those using rotary actuators, powered by a hydraulic unit, integral with the axis of the gate and buried on the ground vertically on the same axis.

 They all have the following disadvantages in common - they are expensive: each mechanism is autonomous and has its own control member; - they require timing circuits to allow the leaves to close one after the other; - they require mechanical unlocking, in the event of a power failure, in order to handle them.

As for hydraulic devices, they have, in addition, the following drawbacks - they use a special hydraulic fluid of a higher cost than that used in the device according to the invention; - They work at medium pressure (20 to 50 bars): which requires very specific pressure adjustments and precautions in the choice of the constituent parts including the pipes if necessary; - they require an electric strike or a specific hydraulic lock to keep the gate locked.

 The object of the present invention is in particular to remedy these various drawbacks - and for this purpose relates to an automatic opening and closing device for doors or gates which is characterized in that it uses, as the sole control fluid, glycol water and that it comprises, in combination a) a low-pressure pressure and control unit; b) two pneumatic cylinders intended to open and close the two leaves; c) pipes, connecting the central unit to the cylinders, made of plastic.

In particular, the pressure and control unit comprises a) a centrifugal pump whose pressure is limited to 3.8 bars; b) a tank containing glycol water; c) a non-return valve placed at the pump outlet; d) a solenoid valve with 5 ports and 2 positions (cross-parallel) controlled by an induction coil.

 Such characteristics allow in particular the use of - low-pressure centrifugal pumps which are very widespread and "inexpensive"; - glycol water at a price much lower than that of hydraulic oil; - plastics and not copper pipes; a single pressure and control unit; - pneumatic and non-hydraulic cylinders and solenoid valves; these various components giving the whole flexibility, reliability and reduced maintenance.

 Other characteristics and advantages will appear on reading the following description of a preferred embodiment of the invention given by way of non-limiting example and shown in the accompanying drawings.

In these drawings - Figure 1 is a detailed view of the opening and closing device; - Figure 2, an overview "device-portal".

The device for automatic opening and closing of doors or gates shown in the figures, comprises - a pressure and control unit (1) which itself comprises:
a low pressure centrifugal pump (2) (3.8 bars maximum) supplied for example with 220 volts AC;
.a reservoir (3) containing glycol water which constitutes the single control and transmission fluid;
a non-return valve (4), placed at the pump outlet, used to lock the gate in the closed position;
a solenoid valve (5), used in pneumatics, with 5 ports and 2 positions (crossed-parallel), controlled by an induction coil, supplied for example with 12 continuous volts; - two pneumatic cylinders (6) and (7) placed respectively between the pillars (8) and (9) of the portal and the corresponding leaves (10) and (11); they are connected to the central unit (1) by two pipes (12) and (13), made of plastic: (li) corresponding to the closing circuit and (13) to that of opening the leaves; the cylinders can be linear or rotary displacement; the "jack-door" (14) and "pillar jack" (15) connections being articulated.

The pipes connecting the two cylinders to the central unit have different lengths so as to allow the two leaves to be offset offset (different pressure losses).

In the event of a power failure, an auxiliary battery supplies the solenoid valve so that there is no need to mechanically unlock the system from the inside and require an auxiliary door to allow this operation.

The pneumatic cylinders are chosen to be of sufficient section to obtain, on each leaf, a maximum torque of 15 decanewtons per meter.

Of course, the device according to the invention can be adapted to a single door or to a gate with a single leaf.

 The operation of the assembly is as follows 1) the solenoid valve in position (a) controls the closing of the leaves: circuit (12), under pressure. circuit '(13) in communication with the reservoir; once the leaves are closed, the non-return valve locks them; 2) the solenoid valve in position (b) controls the opening of the circuit leaves (13) under pressure. circuit (12) in communication with the tank.

 Torque limiting means, opening detection, etc., can be adapted on this system.

 Of course, the invention is not limited to the embodiment described and shown for which we can provide other variants without departing from the scope of the invention.

Claims (6)

 1- Device for automatic opening and closing of doors or gates with two leaves, characterized in that it uses, as the sole control fluid, glycol water and that it comprises, in combination a) a central pressure and control '(1), low pressure; b) two pneumatic cylinders (6) and (7), intended to open and close the two leaves (10) and (11); c) pipes (12) and (13), connecting the central unit to the jacks, made of plastic.  2- Device according to claim 1, characterized in that the central pressure and control (1) comprises a) a centrifugal pump (2) whose pressure is limited to 3.8 bars; b) a reservoir (3) containing glycol water; c) a non-return valve (4) placed at the pump outlet; d) a solenoid valve (5), with 5 orifices and 2 positions (cross-parallel), controlled by an induction coil.  3- Device according to claim 1, characterized in that the pneumatic cylinders are of sufficient section to obtain, on each leaf, a maximum torque of 15 decanewtons per meter.  4- Device according to one of claims 1,2 or 3 ', characterized in that the pipes, connecting the two cylinders to the central, have different lengths so as to allow the closing offset of the two leaves.  5- Device according to any one of the preceding claims, characterized in that the jacks used can be linear or rotary movement.  6- Device according to any one of the preceding claims, characterized in that the control coil of the solenoid valve is supplied by an auxiliary battery.