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A decelerating device intended to intercept an end-of-stroke part of a closing path of a mobile member, such as a furniture drawer or door, including: a body fastenable in use to an abutting surface for the mobile member and internally defining a sealed chamber filled in use with a viscous fluid; a

A decelerating device intended to intercept an end-of-stroke part of a closing path of a mobile member, such as a furniture drawer or door, including: a body fastenable in use to an abutting surface for the mobile member and internally defining a sealed chamber filled in use with a viscous fluid; a pushrod at least in part overhanging from the body and being adapted to cooperate in use with the mobile member, the pushrod being integral with a stem slidingly accommodated in the body against the bias of elastic means between an extracted position of the pushrod and a retracted position; and a piston accommodated in the sealed chamber so as to divide it into two portions hydraulically connected to each other and mechanically connected to the stem; wherein the stem presents a first end integrally connected to the pushrod and a second end opposite to the first, both slidingly accommodated in the body outside the sealed chamber and fluid-tightly towards the sealed chamber itself; the piston is provided with a mobile sealing member to choke the hydraulic communication between the two portions of the sealed chamber only during the stroke of the stem towards the retracted position.

대표청구항 ▼

1. A decelerating device adapted to intercept an end-of-stroke part of a closing path of a mobile member, the device comprising: a body configured to be fastened to an abutting surface for the mobile member and internally defining a sealed chamber configured to be filled with a viscous fluid;an elas

1. A decelerating device adapted to intercept an end-of-stroke part of a closing path of a mobile member, the device comprising: a body configured to be fastened to an abutting surface for the mobile member and internally defining a sealed chamber configured to be filled with a viscous fluid;an elastic member housed in the body;a pushrod at least in part overhanging from the body and configured to cooperate with the mobile member, the pushrod being integral with a stem slidingly accommodated in the body against the bias of the elastic member between an extracted position of the pushrod and a retracted position, said elastic member bounding a portion of said stem within said body; anda piston accommodated in the sealed chamber so as to divide it into two portions maintained in reciprocal hydraulic communication, and mechanically connected to the stem; the stem presenting a first end integrally connected to the pushrod and a second end opposite to the first, wherein said first and second ends of the stem are both configured to slide outside the sealed chamber while housed in the body and are configured to slide in a fluid-tight manner with regard to the sealed chamber;wherein said body comprises a casing shaped so as to define therein a first and a second cup-shaped concavities, reciprocally opposite and subdivided by a common first bottom wall provided with a passage hole for the stem and with a first seat for a seal rubbing on the stem; the first concavity being shaped to accommodate said pushrod therein in said retracted position through one mouth thereof and abuttingly against said first bottom wall; and the second concavity being fluid-tightly closed to one mouth thereof by a cap, so as to define said sealed chamber, said cap comprising a cavity therewithin to accommodate a portion of said stem in said retracted position. 2. The device according to claim 1, wherein said stem is throughly and fluid-tightly mounted through said sealed chamber with its intermediate portion, which carries integral and coaxial said piston. 3. The device according to claim 1, wherein said elastic member is mounted inside said sealed chamber, is submerged in use in said viscous fluid, and acts on a face of said piston opposite of said pushrod. 4. The device according to claim 1, wherein said cap is cup-shaped and overhangingly protrudes inside the second concavity of the casing with its tubular portion ending with a second bottom wall provided with a passage hole for the stem and a second seat for a seal rubbing on the stem; said first and second seats presenting assembly mouths for the respective seals facing opposite sides, that of said first seat facing said cap. 5. The device according to claim 4, wherein said tubular portion of the cap radially forms on the outside a predetermined clearance with a lateral wall of the second concavity and internally defines a second seat accommodating the second end of the stem, in the retracted position of the pushrod; said elastic member being defined by a helical spring accommodated within said predetermined clearance, fittingly carried by the tubular portion of the cap and sandwiched with a predetermined preload between said piston and said cap. 6. The device according to claim 5, wherein said cup-shaped cap is closed to its access mouth toward said tubular portion of the same, by a cover provided with at least one vent opening for the air present in said second seat for the second end of the stem. 7. The device according to claim 1, wherein the piston is provided with a mobile sealing member for choking said hydraulic communication between the two portions of the sealed chamber only during the stroke of the stem toward said retracted position. 8. The device according to claim 7, wherein said hydraulic communication between the two portions of the sealed chamber is defined by a radial clearance between said piston and an internal lateral surface of said sealed chamber, through which said viscous fluid leaks following the sliding of the stem, and said mobile sealing member being formed by an o-ring mounted with clearance in a peripheral annular seat of the piston radially delimited towards the sliding axis of the stem by a conical surface, which tapers facing the opposite side of the pushrod. 9. A piece of furniture provided with a decelerating device according to claim 1 fitted to an abutting surface of at least one mobile member of the furniture, so as to be adapted to intercept with said pushrod an end-of-stroke part of a closing path of the mobile member to consequently produce a sliding of the stem towards the retracted position of the pushrod, against the bias of said elastic member. 10. The piece of furniture according to claim 9, wherein the mobile member is a drawer of the furniture.