device for preventing the penetration of foreign bodies and ensure the implementation and permit the restraint of lubricant in twinned wheels

摘要

Device for preventing the penetration of foreign matter and for allowing the application and retention of lubricant in self-orientating twin castors comprising a pair of wheels (14, 15) which are rotatably mounted on a spindle (6) driven through a seat (5) of a support (2) which is composed of a vertical wall (3) lying between the wheels and in which a vertical cylindrical recess (4a) is formed; the recess is open upwards for the rotational engagement of a stem (4b) for mounting the castor on a piece of furniture; two tubular portions (7, 8) are rigidly coupled to the opposite sides of the wall and are coaxial to the spindle (6); tubular bosses (16) rigidly coupled to the respective wheels (14, 15) protrude into the tubular portions (7, 8); a vertical blind recess (21) is furthermore formed in the wall and opens into the seat (5) above the spindle (6); a through bore (22) is also provided in the wall and is aligned with the blind recess (21) below the spindle; a spring (20) is accommodated in the recess (21) and acts on the spindle (6); the device is characterized in that it comprises elements (23-28) for closing the bore (22) and for preventing the leakage of lubricant through the tubular portions. IMAGE