HK1054067B - Damping device for movable furniture parts - Google Patents

Description

Damping device for movable furniture parts

Technical Field

The invention relates to a damping device for movable furniture parts, such as doors or drawers, comprising a cylinder filled with a free-flowing medium, which is compressed by a piston having a spring applied to it in its extended position.

Background

In a damping device of the type known from european patent 1006251 a2, the piston is provided with a piston rod carrying a cap which absorbs the impulse to be damped. This known damping device has a relatively large overall length, so that in principle it is only possible to attach to the inside of the wall of the body part of a piece of furniture in order to damp the impulse from a furniture part hitting this piece of furniture. However, it is also desirable to provide damping devices that can be attached not only to the body parts of immovable furniture, but also to movable furniture parts, in order to brake these parts against the furniture part during its movement or when it comes to a stop, in order to prevent more intense impulses.

Disclosure of Invention

It is therefore an object of the present invention to provide a damping device for movable furniture parts, which is characterized by a short length and/or a shallow installation depth, so that it can be attached even to thinner furniture parts, such as flaps, doors, or drawer panels.

According to the invention, this object is achieved in that the cylinder is a telescopic cylinder with at least two stages, and the pressure spring is clamped between the bottom of the outer cylinder of the last stage and the piston of the first stage.

As embodied according to the invention, the damping device can be inserted into a small bore hole, for example, which is typical for box-shaped hinged parts, the telescopic part can also be pushed into the bore hole without any protrusion.

In the damping device according to the invention, the telescopic cylinder principle is implemented in such a way that in the last cylinder, the cylinder is guided or in which the next cylinder is guided, so far as the first cylinder, in which the first piston is guided.

A first aspect of the invention provides a damping device for a movable furniture part, comprising: a telescopic cylinder having at least two stages, which is filled with air and is moved into its extended position by spring force, the air being expelled when the telescopic cylinders are pressed together, characterized in that a pressure spring is clamped between the bottom of the outer cylinder of the non-stage and the piston of said telescopic cylinder; and a sealing means inserted into annular grooves in the lower end areas of the movable cylinder and the piston or over the upper edges of the outer cylinder and the movable cylinder, the sealing means being placed in a sealed state into the inner walls of the outer cylinder and the movable cylinder or into the outer walls of the movable cylinder and the piston.

A second aspect of the invention provides a damping device for a movable furniture part, comprising: a telescopic cylinder having at least two stages, which is filled with oil and is moved into its extended position by spring force, said oil being discharged when the telescopic cylinders are pressed together, characterized in that a pressure spring is clamped between the bottom of the outer cylinder of the non-stage and the first-stage piston of said telescopic cylinder; a plurality of annular sealing means placed in annular grooves in the lower end areas of the movable cylinder and the piston, or over the upper edges of the outer cylinder and the movable cylinder, the sealing means defining in a sealed condition annular chambers between the outer cylinder and the movable cylinder and between the movable cylinder and the piston, respectively.

The damping device according to the invention conveniently comprises a double-stage telescopic cylinder, which therefore has only a single telescopic cylinder guided in the main cylinder, in which the piston is guided.

If the diameter of the cylinder is greater than its length, it is possible to obtain a particularly short construction of the damping device according to the invention. The diameter of the piston guided in the primary telescopic cylinder is also suitably greater than its length, including the piston rod.

In a further embodiment of the invention, the piston and the movable cylinder are each provided with a flange which in the extension direction of the telescopic cylinder presses against an annular flange which is positioned on the outer ends of the main cylinder and the movable cylinder and which is made smaller in diameter. This flange is embodied like an annular piston.

The outer cylinder is conveniently terminated by a base plate attached so that the cushioning device can be installed by first collapsing the piston into the first stage movable cylinder and sequentially collapsing the next stage cylinders into each other so that for final assembly the main cylinder is terminated by the base plate only after the compression spring is inserted.

The piston of the first stage, or the shaft connected thereto, is suitably provided with a cap which absorbs the impulse.

The outer cylinder, the movable cylinder, and the piston are suitably made of injection molded parts or die cast metal parts.

In order to retain the pressure spring, the base plate is suitably provided with a cylindrical projection and the piston with a small bore.

If the free-flowing medium is air, a sealing device, for example a lip seal, is placed in the annular groove of the flange and the primary piston is provided with an axial ventilation hole. When the piston and the telescopic cylinder of the damping device are compressed, air escapes in a throttled manner through this vent hole, so that the desired damping effect is produced.

The lip seal may have a V-shaped or U-shaped cross-section whereby the V-shaped or U-shaped groove formed is connected to the cylindrical chamber by a bore in the outer wall of the groove provided in the flange rim. Due to this design, the grooves of the lip seal have the gas pressure in the cylindrical chamber applied to them, so that the outer uprights of the grooves, which form the lip seal, press with greater pressure on the cylinder wall, wherein they are directed correspondingly to the increased inner pressure.

According to another preferred embodiment, a high viscosity grease is applied to the cylindrical inner chamber wall, and the primary piston is provided with an axial vent. This high viscosity grease seals the cylindrical chambers, thus replacing the seals and/or lip seals of the previous embodiments.

The annular sealing means pressing on the piston shaft and the outside of the movable cylinder forming the seal are conveniently inserted in the annular groove of the flange.

If the free-flowing medium is oil, an annular sealing device is inserted into an annular groove of the flange of the annular chamber between the sealing flange and the flange, the flange being provided with an orifice. Also in this embodiment, the annular sealing means pressing on the piston shaft and the outside of the movable cylinder forming the sealing means are inserted in the annular groove of the flange.

Drawings

Exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a top or side wall of a cabinet with a door or drawer front floor pressed thereon in a closed position using a cushioning device according to the present invention;

FIG. 2 shows a cross-sectional view through a first embodiment of a cushioning device according to the present invention in its extended position;

FIG. 3 shows the damping device as described in FIG. 2 in its compressed position into the master cylinder body;

FIGS. 4-10 illustrate individual components of the cushioning devices illustrated in FIGS. 2 and 3;

figures 11 and 12 show illustrations corresponding to figures 2 and 3 of a second embodiment of a damping device according to the invention;

FIGS. 13-17 illustrate individual components of the cushioning device according to FIGS. 11 and 12;

figures 18 and 19 show illustrations corresponding to figures 2 and 3 of a third embodiment of a damping device according to the invention, an

Fig. 20-24, which show the individual components of the cushioning device according to fig. 18 and 19.

Detailed Description

Fig. 1 shows a damping device 1 according to the invention, which is inserted into a small bore 2 of a door, lid or drawer panel 3 in a position just before the surface of a wall 4 of a cabinet body or the like.

A first embodiment of a cushioning device according to the present invention is shown in fig. 2-10. It comprises a main cylinder 6, in which a telescopic cylinder 7 is movably guided and in which a piston 8 is movably guided.

The main cylinder 6 comprises a cylindrical tubular portion having a diameter greater than its length. On its upper edge, the main cylinder body is provided with an inwardly projecting annular flange 9 and a peripheral flange 10 with which it supports itself on the edge of the hole or on a small drilled hole into which it can be inserted. The flange 10 may be provided with an ear-shaped projection having a hole for receiving a fastening screw.

At its lower end, the main cylinder 6 has an annular step into which a base plate 11 is inserted, which can be connected to the main cylinder by ultrasonic welding, for example if these parts are made of plastic. The base plate 11 has a centrally located hollow cylinder 12 which serves as a clamp for the lower end of a compression spring 13, the upper end of which is captured in a small bore 14 in the piston 8.

A movable cylinder 7 is guided in the cylinder 6. This movable cylinder has a flange 15 at its lower end provided with a peripheral annular groove 16 in which an annular lip seal 17 is placed. The lip seal 17 is V-shaped in cross-section and the outer leg 18 of the channel formed in this way presses against the inner wall of the main cylinder 6 to form a seal. The lower wall defining the groove 16 is provided with a hole 19 which opens into the V-shaped groove of the lip seal 17, so that the pressure of the cylindrical chamber is present in this groove, while the sealing lip 18 presses against the wall of the cylinder 6.

The movable cylinder 7 is provided at its upper end with an annular flange 20 which defines its diameter, against which the piston 8 presses in an extended state. The piston 8 is provided with an annular groove in a corresponding manner to the movable cylinder 7, into which a sealing ring 21 is inserted, its V-shaped groove being connected to the cylindrical chamber through the hole 22. The piston 8 is supported by a shaft-shaped member 24, into the surface of which an annular groove 25 is introduced, which is used to receive and retain a tubular clamping member 26 of a cap 27. The top wall 28 of the piston 8, which defines the small bore recess 14, is provided with a central bore 29 which is in line with the bore 30 of the cap 27 and which forms an orifice for air to escape from the cylindrical chamber when the cushioning device is compressed. The holes 30 open into the slot 32 of the cover 27 so that the escape of air is not impaired in the event of impact against a wall of a furniture part.

The movable cylinder part 7 has at its upper end a flanged rim which supports a cylindrical ring 34, thus forming an annular housing chamber 35 into which the head cover 27 can be sunk when the cushioning device is compressed.

As can be seen in fig. 3, in the compressed state of the damping device both the pistons 8, including the head cover 7, and the movable cylinder 7 are fully immersed in the main cylinder 6, so that the damping device can be positioned in a small bore hole whose movement is to be damped, or a moving furniture part, in such a way that, in the compressed state, no part projects above the surface of the furniture part in which the damping device is countersunk.

The embodiment shown in figures 11-16 differs from the embodiment shown in figures 2-8 in that the flange 40 of the movable cylinder 7 and the piston 41 have high viscosity grease 42 applied to them instead of being sealed against the cylindrical wall in the main and movable cylinders by lip seals.

Further, in the annular flanges 9 and 20 of the main cylinder 6 and the movable cylinder 7, there are provided annular grooves which project inward, into which seal rings 44 are inserted, which press against the outside of the shaft members of the movable cylinder 7 and the piston 41, forming seals.

The embodiment shown in fig. 18-24 differs from the previous two embodiments in that the liquid medium to be compressed is oil 50. The oil 50 contained in the cylindrical chamber is compressed through the orifice 51, which is introduced into the flange 55, which causes the annular piston and the edge of the piston 57 to form annular chambers 52, 53, one of which is formed between the flange 55 of the movable cylinder 7 and the flange 9 of the main cylinder 6, projecting inward, and the other of which is formed between the piston 57 and the flange 20 of the movable cylinder 7, which also projects inward.

These annular chambers 52, 53 are sealed off from the outside by sealing rings 44, which are inserted into the annular grooves of the flange rims 9, 20 in the manner described above.

Claims (14)

1. A damping device (1) for a movable furniture part (3), comprising:

-a telescopic cylinder with at least two stages, which is filled with air and is moved into its extended position by spring force, the air being expelled when the telescopic cylinders are pressed together, characterized in that a pressure spring (13) is clamped between the bottom (11) of the outer cylinder (6) of the last stage and the piston (8) of the telescopic cylinder; and the number of the first and second groups,

-sealing means (17, 21, 44) inserted into annular grooves in the lower end areas of the movable cylinder (7) and the piston, or over the upper edges of the external cylinder (6) and the movable cylinder (7), placed in a sealed condition between the internal walls of the external cylinder (6) and the movable cylinder (7), or in the external walls of the movable cylinder (7) and the piston (8).

2. Damping device according to claim 1, characterized in that the piston (8) is provided with an axial ventilation hole (29, 30).

3. A damping device according to claim 1 or 2, characterised in that the sealing means is a lip seal (17, 21) having a V-shaped or U-shaped cross-section, and that the V-shaped or U-shaped groove of the lip seal formed in this way is connected to the cylindrical chamber by a bore (19, 22) in the outer wall of the groove.

4. A damping device according to claim 1 or 2, characterised in that a highly viscous grease (42) is applied to the cylindrical inner chamber wall and the piston is provided with an axial ventilation hole.

5. Damping device according to claim 1, characterized in that the piston (8) and the movable cylinder (7) are each provided with a flange edge, which each, in the extended position of the telescopic cylinder, bear on an annular flange (9, 20), which flange (9, 20) is arranged on the outer end of the outer cylinder (6) and the movable cylinder (7) and narrows their diameter.

6. A damping device according to claim 5, characterised in that an annular sealing means (44) is placed in an annular groove of the annular flange and is inserted in a sealed condition into the rod (24) of the piston (41) and into the outside of the movable cylinder (7).

7. A damping device (1) for a movable furniture part (3), comprising:

a telescopic cylinder having at least two stages, which is filled with oil and is moved into its extended position by spring force, said oil being discharged when the telescopic cylinders are pressed together,

a pressure spring (13) is clamped between the bottom (11) of the external cylinder (6) of the non-stage and the piston (8) of the first stage of the telescopic cylinder;

a plurality of annular sealing means placed in annular grooves in the lower end areas of the movable cylinder (7) and the piston (8), or above the upper edges of the external cylinder (6) and the movable cylinder (7), said sealing means defining, in a sealed condition, annular chambers (52, 53) between the external cylinder (6) and the movable cylinder (7) and between the movable cylinder (7) and the piston (8), respectively.

8. Damping device according to claim 7, characterized in that the piston (8) and the movable cylinder (7) are each provided with a flange edge, which each, in the extended position of the telescopic cylinder, bear on an annular flange (9, 20), which flange (9, 20) is arranged on the outer end of the outer cylinder (6) and the movable cylinder (7) and narrows their diameter; and the flange side has an orifice (51).

9. Damping device according to claim 1, characterized in that the diameter of the cylinder (6, 7) is greater than its length.

10. A damping device according to claim 1 or 7, characterised in that the diameter of the piston (8) is greater than its length, including the piston rod (24).

11. Cushioning device according to claim 1 or 7, characterized in that the outer main cylinder (6) is closed by a base plate (11) placed therein.

12. Cushioning device according to claim 1 or 7, characterized in that the piston (8), or the rod (20) connected thereto, is provided with a top cover (27) absorbing the impact force.

13. A damping device according to claim 1 or 7, characterized in that the outer cylinder (6), the movable cylinder (7) and the piston (8) are made of injection-moulded parts or diecast metal parts.

14. Cushioning device according to claim 1 or 7, characterized in that, for the purpose of retaining the pressure spring (13), the base plate (11) is provided with a cylindrical projection (12) and the piston (8) with a small bore (14).