DECELERATING STOP DEVICE FOR A MOVABLE MEMBER, IN PARTICULAR A FURNITURE DOOR OR DRAWER, FITTABLE TO A STOP SURFACE OF THE MOVABLE MEMBER

• US 20090119873A1
• Filed: 03/29/2007
• Published: 05/14/2009
• Est. Priority Date: 03/31/2006
• Status: Active Grant

• Current Assignee: ITW Industrial Components s.r.l. (Illinois Tool Works Inc.)
• Original Assignee: ITW Industrial Components s.r.l. (Illinois Tool Works Inc.)
• Inventors: Bassi, Alberto
• Granted Patent: US 8,104,140 B2
• Time in Patent Office: Days
• US Class Current: 16/84
• CPC Class Codes: E05F 5/08 with springs
• CPC Class Codes: E05F 5/10 with piston brakes
• CPC Class Codes: E05Y 2201/21 Brakes
• CPC Class Codes: E05Y 2201/212 Buffers
• CPC Class Codes: E05Y 2201/256 with pistons or vanes
• CPC Class Codes: E05Y 2201/264 linear
• CPC Class Codes: E05Y 2900/20 for furnitures, e.g. cabinets
• CPC Class Codes: F16F 9/20 with the piston-rod extending through both ends of the cylinder , e.g. constant-volume dampers
• CPC Class Codes: F16F 9/3242 of cylinder ends, e.g. caps

Abstract

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.

Claims

1. A decelerating device of the type adapted to intercept an end-of-stroke part of a closing path of a mobile member, such as a furniture drawer or door, comprising:

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 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;

characterised in that said first and second ends of the stem are both slidingly housed in the body outside the sealed chamber and fluid-tightly towards the sealed chamber itself.

2. A device according to claim 1, characterised in that said stem is thoroughly and fluid-tightly mounted through said sealed chamber with its intermediate portion, which carries integral and coaxial said piston.

3. A device according to claim 1, characterised in that said elastic means are arranged mounted inside said sealed chamber, submerged in use in said viscous fluid, and act on a face of said piston facing opposite sides of said pushrod.

4. A device according to claim 1, characterised in that 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 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 so as to be adapted to accommodate therein, through one mouth thereof and abuttingly against said bottom wall, said pushrod; and

the second concavity being fluid-tightly closed to one mouth thereof by a cap, so as to define said sealed chamber.

5. A device according to claim 4, characterised in that said cap is cup-shaped and overhangingly protrudes inside the second concavity of the casing with its tubular portion ending with a 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.

6. A device according to claim 5, characterised in that 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 seat accommodating the second end of the stem, in the retracted position of the pushrod;

said elastic means 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.

7. A device according to claim 6, characterised in that 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 housing seat for the second end of the stem.

8. A device according to claim 1, characterised in that 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.

9. A device according to claim 8, characterised in that 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 may in use leak following the sliding of the stem;

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.

10. 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, such as a drawer or door, 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 means.