Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Closers
Patent
1996-04-08
1997-11-18
Mah, Chuck Y.
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Closers
16 58, E05F 100
Patent
active
056874510
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The invention relates to a revolving door drive having a hydraulic closing device with a hydraulic piston-cylinder unit, a closing spring and a motor-operated opening device with a hydraulic pump and an electromotor.
A revolving door drive of this type is known, for example, from German Patent Document DE-OS 32 02 966. A so-called electrohydraulic door closing device is described there which has a pressure spring as an energy accumulator for the closing and a hydraulic pump with an electromotor for the motor-operated opening. The opening of the door takes place fully automatically in that the piston is hydraulically displaced by means of the hydraulic pump while the closing spring is compressed; the closing operation will then take place purely mechanically as in the case of a conventional hydraulic door closing device under the effect of the closing spring. It is a disadvantage in the case of such known revolving door drives with a fully automatic opener motor that the construction is relatively large. It is essentially the result of the high-power unit consisting of the hydraulic pump and the electromotor which is required for the fully automatic opening. However, in practice, a fully automatic motor-operated opening of the door is frequently not necessary. A so-called servo-closer would often be sufficient which has an opening motor which is used only for the purpose of assisting in the case of a manual opening.
From German Patent Document DE-OS 32 34 319, a so-called automatic door closing device is known in the case of which the closing spring can be prestressed hydraulically during the opening by way of an independently movable supporting member arranged between the piston and the closing spring by means of a hydraulic pump so that the user of the door does not have to apply any force for the prestressing of the closing spring. The construction is relatively complicated.
It is an object of the invention to further develop an initially mentioned revolving door drive in such a manner that it can be used as a servo door closer and has a relatively simple and small construction.
The invention achieves this object in that, during the motor-operated opening operation, the pressure of the hydraulic medium is controlled while it is adapted to the momentary force of the closing spring. As a result, it is taken into account that, as a function of the respective door opening angle and depending on the spring prestressing, different pump pressures are in each case required in order to manually open the door, preferably along the whole rotating range without any additional application of force.
In preferred embodiments of the revolving door drive, the piston is displaceably guided in the hydraulic cylinder while forming a pressurized chamber and an unpressurized chamber. For controlling the pump pressure, it may be provided in this case that the closing spring interacting with the piston or a spring adapted to this closing spring is supported by means of its one end on the piston and by means of its other end on a hydraulic pressure pad, in which case the same hydraulic pressure is adjusted in a controlled manner in the pressure chamber and in the hydraulic pressure pad. Preferably, the pressure chamber and the hydraulic pressure pad are hydraulically connected in this case with the delivery side of the hydraulic pump and, in different opening positions of the door, a pressure equilibrium can be adjusted in the pressure chamber and in the pressure pad. According to the relationship of the operative surfaces of the piston absorbing the pressure in the pressure chamber and of the valve member in the pressure pad, when the pressure equilibrium is adjusted, the piston is displaced under the effect of the pump pressure (automatic opening system) or is held in a floating manner (servo operation). In preferred embodiments, the quotient of the operative surfaces can be adjusted in an optional manner.
In the stationary pressure equilibrium in the servo operation, the piston is held
REFERENCES:
patent: 4365442 (1982-12-01), Speer
patent: 4660250 (1987-04-01), Tillman et al.
patent: 4910961 (1990-03-01), Ribaudo
patent: 4995194 (1991-02-01), Schultze et al.
patent: 5251400 (1993-10-01), Schultze
Geze GmbH & Co.
Mah Chuck Y.
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