DE19915164A1 - Sprung cylinder for use with furniture fitting - Google Patents

Abstract

The sprung cylinder has a cylinder housing (26) and a movable rod part (30) and spring (36) whose first end with the cylinder housing, and other end works together with the rod part. The outer surface (64) of the rod part and/or the inner surface of the cylinder housing are built such that both opposite lying surfaces of the cylinder housing and the rod part are movable against one another. They are movable over a first elevation of the rod part or first friction. They are also movable over a second part of the elevation, against the first different friction.

Description

The invention relates to a spring cylinder for use together with a furniture fitting according to the generic term of claim 1.

For furniture fittings that are relatively heavy against connect pieces of furniture to be moved (especially Flaps around one at their top end horizontal axis are pivotable) are often spring cylinder used to support the weight of the moveable furniture at least partially record and so that Moving this piece of furniture by the user to facilitate tern.

Such spring cylinders have the disadvantage that sometimes the spring force is so great that the movable Furniture part if it is not manually in the ge desired end position is guided by the spring cylinder hard against one that specifies the end position Stop is driven. The furniture part then bounces off this hard attack back and then by the spring cylinder again against the stop moves. This is both in terms of wear and tear also disadvantageous in terms of noise.

The present invention is therefore intended to be a spring cylinder according to the preamble of claim 1 so white be educated that the rod part when entering is dampened into its extended position because of and such a hard hit of the furniture part on which  the spring cylinder works, is avoided.

This object is achieved by a Spring cylinder with the Merk specified in claim 1 to paint.

The spring cylinder according to the invention allows in one support of the first section of its stroke Movement of the furniture part, as in a known Zy linder, but worries in a second section of his Hubes for damping the movement of the furniture part. This is achieved with mechanically simple means which is the cost of a spring cylinder increase only marginally.

Advantageous developments of the invention are in Un claims specified.

The development of the invention according to claim 2 with a view to progressively dampening the movement of the rod part is an advantage. Tapered surfaces can be also on molded parts, especially injection molded plastic create sharing very easily.

For damping spring cylinders that work together with Furniture fittings are used, cone surface opening angle as specified in claim 3, particularly advantageous.

The development of the invention according to claim 4 a particularly fine and up to the end of the Hubes controlled damping of the movement of the bars part, since you essentially only have a line contact that generates the frictional force. So the un controlled transition between sliding friction and detention  friction less exposed to randomness than with surface contact.

According to the development according to claim 5, one can very fine and - if desired - elastic Establish frictional contact.

In the development of the invention according to claim 6 the working edge is gone due to a larger volume underlying material given so that the damping properties remain constant over a long period of time.

The development of the invention according to claim 7 allows an adjustment of the damping force via the deformable speed of the addressed section of the cylinder housing and / or rod part.

According to claim 8, the elasticity of the above Section of the cylinder housing and / or rod part control over the geometry and number of slots, which allows you to choose the material for these parts is largely free.

The development of the invention according to claim 9 allows tet it, the deformable portion of the cylinder housing to give a pre-deformation. That way you can the point at which the damping begins, in axial Set direction and manufacturing fluctuations in the Adjust dimensions of cylinder housing and rod part chen, to different points of use for the Would cause friction damping.

In a spring cylinder according to claim 10, the clamping ring in the axial direction on the cylinder housing posi tioned what with regard to a precise and reproducible  adjustable setting of the starting point of the friction damper is an advantage.

The development of the invention according to claim 11 allows easy adjustment of the damping insert point, the adjustment mechanism being very compact Has.

The development of the invention according to claim 12 allows a simple manual adjustment of the damping characteristics Logistics without the use of tools.

This remains with the development of the invention Claim 13 a damping charters once set obtained because the clamping ring is flat on the slot attacks the th section of the cylinder housing.

The development of the invention according to claim 14 allows it, also the clamping ring a certain spring property to give. This allows the damping characteristic even more variable.

The development of the invention according to claim 15 is with a view to securely gripping the clamping ring and turning it with greater torque of Advantage. You can thus the thread on which the Tension ring runs, form as self-locking thread, so that the position of the clamping ring once set remains in the long term.

In a spring cylinder according to claim 17, this is used Inside of the rod part also as a spring chamber. In order to can build the spring cylinder axially short.

The development of the invention according to claim 18 is used  an improved guidance of the rod part. In order to the spring cylinder can easily absorb tilting moments without that this requires an elaborate guidance of the rod part would be necessary in that cylinder end wall which the rod part is passed through.

The development of the invention according to claim 19 is with regard to low friction between the guide part and rod part an advantage.

With the development of the invention according to claim 20 is achieved that the spring cylinder only one needs to have a small number of components. Also the assembly of the spring cylinder is ver in this way simple.

In a spring cylinder according to claim 21 can adjust the spring preload.

According to claim 22 you get one without additional components Step lock, which is formed in the cylinder housing is.

Locked in a spring cylinder according to claim 23 the step lock simply under the force of the spring of the spring cylinder.

The training according to claim 26 is in view for easy adjustment of the spring preload even with small dimensions of the cylinder housing is an advantage.

The design of the operating handle according to claim 27 is in view of a tight closure of the Locking groove and preventing fingers from getting caught a user advantage, especially if the  Operating handle in the adjustment direction is long, so that it largely or completely closes the locking groove.

For spring cylinders that together with furniture fittings used are surface qualities, as they are in Claim 28 are specified, particularly advantageous.

The development of the invention according to claim 29 he allows too little production of the spring cylinder Costs. Plastics are also controllable frictional relationships for the one considered here The desired size is advantageous.

The invention based on embodiment examples with reference to the drawing explained. In this show:

Figure 1 is a vertical section through a furniture compartment, which can be closed by a pivoting flap, together with an opening movement of the flap support the spring cylinder with integrated damping function.

Fig. 2 is a side view of a cap and guide member of the spring cylinder shown in Fig. 1;

Fig. 3 is a side view of a cylinder housing of the spring cylinder of Fig. 1;

Fig. 4 is a side view of a Stangentei les of the spring cylinder shown in Fig. 1;

. 5 is an enlarged view of a portion of the damping cylinder which is part of a cushioning Fig;

Fig. 6 shows a transverse section through the portion of the cylinder housing shown in Figure 5 along the section line VI-VI of Fig. 5.

. Fig. 7 is an axial section through the left-positioned in Figure 4 the end of the rod member;

Fig. 8 is a transverse section through a clamping ring of the spring cylinder of FIG. 1;

Fig. 9 is a transverse section through the Füh tion part of the spring cylinder of FIG. 1;

FIG. 10 is a view similar to FIG. 5, but showing a modified embodiment for the cylinder housing;

Fig. 11 is a side view of a modified cylinder housing;

FIG. 12 is an axial section through a clamping ring, which is used together with the cylinder housing of FIG. 11;

Fig. 13 is a plan view of the end face of the clamping ring according to Fig. 12;

FIG. 14 is a side view of a bearing cap for the cylinder housing shown in FIG. 11;

Fig. 15 is a side view of a modified spring guide member for use with the cylinder housing of FIG. 11;

FIG. 16 shows a transverse section through the head of the guide part shown in FIG. 15 along the section line XVI-XVI from FIG. 15; and

Fig. 17 is an enlarged view of an actuating part for adjusting the guide part in the cylinder housing.

In Fig. 1, a section of a furniture compartment is indicated schematically at 10 , which can be closed ver at its open end located on the right in Fig. 1 by a flap 12 . The latter is connected to the furniture compartment 10 by a hinge 14 located at its upper end, which is only indicated schematically and in practice can be a concealed hinge, which simultaneously ensures a rotational movement and a translational movement of the flap 12 , so that the latter in its closed position Front of the furniture compartment 10 covered symmetrically.

To compensate for the weight of the flap 12 and the Publ nen to facilitate the furniture compartment, a generally denoted by 16 spring cylinder is provided. This sits with its one lower end on a pivot pin 18 which is supported by a screwed to the furniture compartment 10 fitting plate 20 . The other end of the spring cylinder sits on a pivot pin 22 which is supported by an angled fitting plate 24 which is screwed to the flap 12 .

The spring cylinder 16 consists of three injection molded plastic components, namely a tubular cylinder housing 26 , a lower cap and guide part 28 in the drawing, a rod part 30 and a plastic clamping ring 32 which is carried by the cylinder housing 26 .

The rod part 30 is hollow and so gives a spring chamber 34 in which a coil spring 36 is arranged. This is supported at one end on the upper floor of the spring chamber 34 , with its end at the end face of the cap and guide part 28 .

As can be seen from Fig. 2, the cap and guide part 28 has a cap portion 38 which is fixed (e.g. by press fit or gluing or welding) in the open lower end of the cylinder housing 26 is inserted. The cap section 38 has a bearing bore 40 which cooperates with the pivot pin 18 in a sliding fit.

The cap section 38 carries a guide section 42 which has four axial guide ribs 44 equally distributed in the circumferential direction. The clear outer contour of the guide section 42 is selected so that the guide section 42 can engage part 30 in the sliding play inside the hollow rods.

As can be seen from FIGS . 3 and 5, the inner surface of the cylinder housing 26 is formed as a stepped bore which defines a shoulder 46 . Its inner edge forms a working edge 48 .

In the vicinity of the working edge 48 , the wall of the cylinder housing 26 is double-conically thickened on the outside, as indicated at 50. The opening angle of the conical surfaces 50 is 4.76 °. Between the two conical surfaces there is a cylindrical constriction 52 , which specifies two axially spaced shoulders 54 , between which the clamping ring 32 , indicated by dashed lines in FIG. 5, is received.

In an axial area that extends beyond the shoulders 54 , the wall of the cylinder housing 26 in the vicinity of the working edge 48 is provided with four slots 56 which are equally distributed in the circumferential direction. In this way, the intermediate wall sections 58 can be elastically deformed somewhat in the radial direction, whereby the radial position of the working edge 48 can also be changed accordingly.

The rod part 30 shown in FIG. 4 has an end portion 60 on the left in the drawing, which has a larger diameter than the main portion of the rod part and thus gives a stop shoulder 62 which together with the shoulder 46 defines an extended end position of the spring cylinder 16 . The outer surface 64 of the rod part 30 is slightly conical, the tip of the cone being on the right in FIG. 4. In practice, the slope of the conical outer surface 64 is between 1: 200 and 1: 700, preferably (in connection with thermoplastic materials) about 1: 500.

The conical outer surface 64 can thus form a friction damper together with the working edge 48 . The point of use of this friction damping depends on the diameter of the right-hand end of the Stangentei les 30 , the angle of attack of the conical surface and the diameter of the working edge 48th These parameters can be used to set the starting point for friction damping and its extent. Further parameters which influence the damping of friction are the material from which the cylinder housing 26 and the rod part 30 are made and the surface quality of the outer surface 64 and the micro-geometry of the working edge 48 (sharp or rounded).

As can also be seen from FIG. 4, an end section 66 is integrally formed on the rod part 30 , which has a bearing bore 68 which works together with the pivot pin 22 .

The bearing bores 40 and 68 , as can be seen from FIGS. 1 and 4, have an outwardly leading slot 70 in order to be able to slide the bearing bore onto the associated pivot pin in tight sliding play or a loose press fit.

As can be seen from FIG. 7, the end of the inner surface of the rod part 30 has a conical indentation 72 , which centers the end of the guide section 42 when entering the open end of the rod part 30 . The cone 72 can have a slope of 1:25, and the surface quality of the cone 72 is again 0.4.

The clamping ring 32 is, as shown in FIG. 8, provided with a threaded bore 74 in which a clamping screw 76 runs, as shown in FIG. 1, which can also be a self-tapping screw. By screwing the clamping screw 76 more or less far into the threaded bore 74 , one can make a fine adjustment of the working edge 48 in the radial direction.

Preferred materials for the spring cylinder components described above are preferred. For the cylinder housing polymethylene oxide (e.g. trade name Delrin), for the rod part polyamide (e.g. PA 66), for the cap and guide part also polymethylene oxide (eg Delrin). As a material for the clamping ring, a PUR material with a Shore hardness of 90 is suitable. This material is somewhat elastic, so that the clamping ring 30 can be pushed over the conical surfaces 50 into the constriction 52 .

The spring cylinder with integrated friction damping described above works as follows:
If the flap 12 is moved from the open position shown in FIG. 1 to the closed position, the frictional force which is generated by moving the working edge 48 on the conical outer surface 64 must first be overcome during the closing movement. This force becomes smaller as the swivel angle increases, since the diameter of the part of the outer surface 64 lying at the working edge 48 decreases increasingly. At the same time, the coil spring 36 is compressed between the bottom of the spring chamber 34 and the end face of the guide section 42 by this movement. In the closed position, the flap 12 is held by a schematically indicated magnetic catch 78 or another closure in contact with the front of the furniture compartment 10 .

If the flap 12 is opened, the opening movement is supported by relaxing the coil spring 36 . From a point specified by the setting of the clamping screw 76 , the working edge 48 comes into frictional engagement with the outer surface 64 of the rod part 30 . From this point, the opening movement of the flap 12 is then gradually dampened. The flap 12 is thus stopped gently, even if the user releases it before the open position is reached.

In the modified embodiment according to FIG. 10, the working edge 48 is seated on a narrow rib 80 which extends in the circumferential direction and which is integrally formed on the inner surface of the cylinder housing 26 . The working edge 48 is less supported in this embodiment and in turn elastic. So you have a more uniform, less dependent on the stroke but still progressive towards the end position damping of the rod part 30 and the connected movable furniture part.

Figs. 11 to 16 show a further modified embodiment which differs from the above-beschrie surrounded embodiments is that one can change the bias of spring 36 and that can be adjusted merely by rotating the clamping ring 32, the damping characteristics of the spring cylinder. Figs. 15 to 17 are shown in an enlarged scale different.

Parts of the various components described above already explained are again with the same reference Sign and do not need again in detail to be described.

In this exemplary embodiment, the rod part 30 is configured in exactly the same way as in the first exemplary embodiment and therefore need no longer be shown and described.

The cylinder housing 26 has at its end adjacent to the cap section 38 a locking groove designated overall by 82 . This includes an axially parallel groove section 84 and herringbone branching Nutzweigab sections 86 , 88 , which follow one another at regular intervals and proceed in the opposite direction from the groove section 84 in the biasing direction of the coil spring 36 .

As shown in FIGS. 15 and 16 can be seen, a portion 90 of the head has a spring seat member forming guide member 42 has a blind bore 92. In this, a driving pin 94 is inserted at the mounted spring cylinder 16 , the diameter of which is selected so that it can be moved in the sliding play in the locking groove 82 and which projects beyond the outer side of the cylinder housing 26 . With mounted spring cylinder 16 of the driving pin is in the protruding over the outside of the cylinder housing 26 free end portion 94, an actuating handle presses up 96th The latter has a blind bore 98 which receives the end of the driving pin 94 . An inner surface 100 of the operating handle 96 is curved according to the curvature of the outer surface of the cylinder housing 26 , so that the operating handle 96 runs positively on the outside of the cylinder housing 26 .

The actuating handle 96 is at least so long in the longitudinal direction of the locking groove 82 that a finger actuating it cannot be pinched between it and the locking groove 82 . The actuating handle 96 is preferably so long that it covers the locking groove 82 in all working positions.

To adjust the spring preload, the actuating handle 98 is moved against the spring preload in the direction of the clamping ring 32 , so that the driving pin 96 is released from the receiving branch section 86 or 88 and is in the groove section 84 . It can now be moved in the direction of the cap section 38 (lowering the pre-tension) or moved in the direction of the tensioning ring 32 (increasing the pre-tension) and then moved back into a useful section 86 or 88 , whereby the pre-tension is then fixed.

In the bottom in Fig. 15 end face of the head portion 90 , a recess 102 is incorporated for attaching a Phillips screwdriver.

As can be seen from FIG. 11, a housing section 104 of the cylinder housing 26 containing the slots 56 is conical on its outer surface such that the diameter decreases towards a threaded end section 106 of the cylinder housing 26 .

On the end section 106 of the cylinder housing 26 , a modified clamping ring 32 runs , which is provided with an end thread 106 matching internal thread 108 .

A remote from the internal thread 108 portion 110 of the inner surface of the clamping ring 32 is complementary to the outer surface of the threaded portion 104 forms conical. At the inner surface portion 110 in the direction of the internal thread 108 is another inner surface portion 112 , which is cylindrical.

The peripheral wall of the sleeve-shaped clamping ring 32 is interrupted by two opposite slots 114 , which extend into the vicinity of the internal thread 108 . In this way, two spring arms lying between the slots 124 of the plastic injection molded clamping ring 32 are obtained .

On its outer surface, the clamping ring 32 is seen with a plurality of lower, sharp-edged ribs 126 , which enable the user to exert a larger torque on the clamping ring 32 with small dimensions of the clamping ring.

It can be seen that by screwing the clamping ring 32 onto the threaded end section 106 of the cylinder housing, the radial tension which is exerted on the wall regions of the cylinder housing 26 lying between the slots 56 can be adjusted easily. In this way, the damping characteristic of the spring cylinder 16 can be adjusted easily and without tools, as can the end position of the spring cylinder.

This allows the carpenter or the user to open the door angle of a furniture flap or another moving Furniture part and its moving into the end position set easily and without tools.

Above, the invention has been described with reference to a Federzylin 16 , which is used together with a rotary fitting for a furniture part. It is understood that such a spring cylinder can also be used together with other furniture fittings, the pivoting of a furniture part about a vertical axis or a linear guide of a furniture part. In all cases, it is ensured that the furniture part is not under the force of Coil spring 36 strikes hard in its end position.

Above, a magnetic catch was used to hold the flap 12 in the closed position. Alternatively, you can choose the articulation points of the spring cylinder 16 on the furniture compartment or the flap so that the articulation point 22 is moved over an upper dead center when closing. In this case, the helical spring 36 can then also serve to hold the flap 12 in the closed position.

It can also be seen that according to the invention a progressive Friction damping on a spring cylinder with only very receive little additional mechanical effort becomes.

Claims (29)

1. Spring cylinder for use together with a furniture fitting, with a cylinder housing ( 26 ) and a rod part ( 30 ) movably guided therein, and with a spring ( 36 ), one end of which is connected to the cylinder housing ( 26 ) and the other end of which is connected to the rod part ( 30 ) cooperates, characterized in that the outer surface ( 64 ) of the rod part ( 30 ) and / or the inner surface of the cylinder housing ( 26 ) are designed such that the two mutually opposite surfaces of the cylinder housing ( 26 ) and rods part ( 30 ) over a first part of the stroke of the rod part ( 30 ) are movable against each other with vanishing or first friction and over a second part of the stroke under second, of the first different friction are movable against each other. 2. Spring cylinder according to claim 1, characterized in that one of the opposing surfaces is a conical surface ( 64 ). 3. Spring cylinder according to claim 2, characterized in that the slope of the conical surface ( 64 ) is between 1: 200 and 1: 700, preferably about 1: 500. 4. A spring cylinder according to claim 2 or 3, characterized in that the other of the surfaces lying opposite one another has a working edge ( 48 ) which cooperates with the conical surface ( 64 ). 5. Spring cylinder according to claim 4, characterized in that the working edge ( 48 ) is formed by a radial rib ( 80 ). 6. Spring cylinder according to claim 4, characterized in that the working edge ( 48 ) is formed by a material stage ( 46 ). 7. Spring cylinder according to one of claims 1 to 6, characterized in that the cylinder housing ( 26 ) and / or the rod part ( 30 ) in the frictionally with the rod part ( 30 ) or the cylinder housing ( 26 ) cooperating section radially elastically deformable bar is. 8. Spring cylinder according to claim 7, characterized in that the cylinder housing ( 26 ) and / or the rod part ( 30 ) in the with the rod part ( 30 ) or the cylinder housing ( 26 ) cooperating deformable ren portion with at least one axial extent Kung component having slot ( 70 ) is preferably provided with a plurality of such equally distributed in the circumferential direction slots ( 70 ). 9. Spring cylinder according to claim 8, characterized in that the slots ( 70 ) on the cylinder housing ( 26 ) are provided and the housing carrying the slots sea section ( 52 ) is surrounded by a clamping ring ( 32 ). 10. Spring cylinder according to claim 9, characterized in that the clamping ring ( 32 ) carrying housing section ( 52 ) has shoulders ( 54 ) which position the clamping ring ( 32 ) axially on the cylinder housing ( 26 ). 11. Spring cylinder according to claim 9 or 10, characterized in that the clamping ring ( 32 ) carries a radial clamping screw ( 76 ) which cooperates with the housing section ( 52 ) carrying the clamping ring ( 32 ). 12. Spring cylinder according to claim 9, characterized in that that portion of the cylinder housing ( 26 ) which is provided with at least one axial extension component having slot ( 56 ). at least partially has a conical outer surface ( 104 ) which cooperates with an inner surface of the clamping ring ( 32 ) and that the clamping ring ( 32 ) can be screwed onto a threaded section ( 106 ) of the cylinder housing ( 26 ). 13. Spring cylinder according to claim 12, characterized in that the inner surface of the clamping ring ( 32 ) is at least in a section ( 110 ) complementary to the slots ( 56 ) containing, at least partially conical section ( 104 ) of the cylinder housing ( 26 ) . 14. Spring cylinder according to claim 12 or 13, characterized in that the clamping ring ( 32 ) at least in its conical inner surface section ( 110 ), preferably also in an adjoining cylindrical section ( 112 ) at least one, preferably several distributed in the circumferential direction Has slots ( 114 ). 15. Spring cylinder according to one of claims 12 to 14, characterized in that the clamping ring ( 32 ) has a rough outer surface, for. B. has a plurality of ribs ( 116 ). 16. Spring cylinder according to one of claims 1 to 15, characterized in that the cylinder housing ( 26 ) and the rod part ( 30 ) together have the fully extended position of the rod part ( 30 ) predetermined impact means ( 46 , 62 ). 17. Spring cylinder according to one of claims 1 to 16, characterized in that the rod part ( 30 ) has an open to the interior of the cylinder housing spring chamber ( 34 ). 18. Spring cylinder according to claim 17, characterized by an axial guide part ( 42 ) for the rod part ( 30 ) which is carried by the cylinder housing ( 26 ) and works together with the wall of the spring chamber ( 34 ). 19. Spring cylinder according to claim 18, characterized in that the guide part ( 42 ) has a plurality of circumferentially distributed guide ribs ( 44 ), the planes of which contain the axis of the guide part ( 42 ). 20. A spring cylinder according to claim 18 or 19, characterized in that the guide part ( 42 ) is integrally formed on a cap part ( 38 ) which is fixedly connected to the end of the cylinder housing ( 26 ) remote from the Stan part ( 30 ). 21. Spring cylinder according to one of claims 1 to 20, characterized by a with one end of the spring ( 46 ) cooperating spring seat part ( 42 ) which is axially adjustable in the cylinder housing ( 26 ). 22. Spring cylinder according to claim 21, characterized in that the spring seat part ( 42 ) with a driver mer ( 86 ) is connected, which protrudes through a locking groove ( 82 ) of the cylinder housing ( 26 ). 23. Spring cylinder according to claim 22, characterized in that the locking groove ( 82 ) has an axial groove section ( 84 ) and a plurality of the outgoing Nutzweiab sections ( 84 , 86 ) which in the biasing direction of the spring ( 26 ) to the axis of the cylinder housing ( 26 ) inclined. 24. Spring cylinder according to claim 23, characterized in that the Nutzweigabschnitte ( 84 , 86 ) go at a regular distance from the axial groove portion ( 84 ). 25. Spring cylinder according to one of claims 22 to 24, characterized in that two sets of groove branch sections ( 86 , 88 ) are provided symmetrically to the axial groove section ( 84 ). 26. Spring cylinder according to one of claims 22 to 25, characterized by an actuating handle ( 96 ) carried by the driver ( 94 ). 27. Spring cylinder according to claim 26, characterized in that the actuating handle ( 96 ) positively ( 100 ) on the outside of the cylinder housing ( 26 ) runs. 28. Spring cylinder according to one of claims 1 to 27, characterized in that the mutually opposite surfaces of the cylinder housing ( 26 ) and rods part ( 30 ) have a surface quality of at least 0.6, preferably before about 0.4. 29. Spring cylinder according to one of claims 1 to 28, characterized in that the cylinder housing ( 26 ) and the rod part ( 30 ) are plastic injection parts.