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Priority to ES1968137978UpriorityCriticalpatent/ES137978Y/es
Publication of ES137978UpublicationCriticalpatent/ES137978U/es
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Publication of ES137978YpublicationCriticalpatent/ES137978Y/es
Aparato para apertura y cierre de puertas, caracterizado por estar formado en su parte superior por un juego de rodillas o articulaciones, sujeto por un extremo al dintel anterior de la misma puerta, lugar de las bisagras y cuyas rodillas o articulaciones hacen mover un eje central, que abre o cierra unas válvulas que dan movimiento por compresión a un aceite depositado en el fondo, el cual permite frenar en general el movimiento del cerrado automático, y el movimiento final, evitando que la puerta se cierre de golpe.
ES1968137978U1968-04-191968-04-19Aparato para apertura y cierre de puertas.
ExpiredES137978Y
(es)