DE102006027318B3 - Object support column for vehicle flap, has radial nozzle grooves radially guided towards outside, and sealing ring that is not passed during attachment of sealing ring to another groove sided wall that is close to another working chamber - Google Patents

Abstract

The column has a groove ground (32) with a region that is close to a working chamber and is connected to the chamber by a flow connection. Radial nozzle grooves (36) are formed in a groove sided wall (23) and are opened axially for a circular groove (20). The grooves are radially guided from the groove ground towards outside, and a sealing ring (21) is not passed during the attachment of the sealing ring to another groove sided wall (24) that is close to another working chamber.

Description

The The invention relates to a slide column with a gas spring, the a guide tube closed on both sides having, filled with a compressed gas or compressed gas / oil mixture interior from a displaceable piston into a first working chamber and a second working chamber is divided, with one on the piston with its one end fixedly arranged piston rod through the second Working chamber is passed through and sealed to the outside, with a manual actuated first valve means through which the first working chamber the second working chamber, the piston is immediately connectable and with a second valve means through which the second working chamber is connectable to the first working chamber, wherein the second valve means one on the cylindrical surface of the piston radially open having circumferential annular groove, in which a sealing ring made of an elastic Material is arranged axially movable, with the bias the inner wall of the guide tube in plant and when the sealing ring at the first working chamber closer the first groove side wall can be underflowed in the region of the groove bottom, wherein the closer to the first working chamber area of the groove bottom via a flow connection connected to the first working chamber.

such Slide columns are especially as chair columns related to chair adjustment. It should be arranged on the gas spring, a Chair seat supporting seat support after relief of the previously loaded chair seat from any seat height position automatic in the complete pushed out state of the gas spring to be moved.

at Loading the chair seat, the piston rod moves so long into the gas spring as the first valve device manually open is and an overflow of Compressed gas is allowed from the first to the second working chamber. When closing manually the second valve device is then set the desired seating position.

The second valve device opens at a relief of the chair seat automatically and does not have to be operated manually.

at a slide column of the The aforementioned type is an axial nozzle bore in the first groove side wall from the first working chamber nearer the groove bottom the annular groove to the first working chamber known. The cross section the nozzle bore determines the extension speed. This is a quick but not Too rapid extension of the piston rod cause a hard Avoid striking in the extended end position.

Reach Dirt in the nozzle bore and close wholly or partly their passage cross-section, so it comes to a strongly fluctuating extension speed up to a Blocking the gas spring in the lifting direction. This can also occur if the friction between the guide tube and the sealing ring is too big.

contamination inside the guide tube can due to installation or e.g. caused by abrasion of seals.

From the GB 2 303 194 A Still another gas spring is known for a vehicle door which blocks the pivotal movement of the door in a position between the closed and fully open positions. For this purpose, the piston of the gas spring has a region with a larger diameter, which divides the pressure cylinder by means of a sealing ring into two working chambers, and an area with a smaller diameter. The smaller diameter portion also includes a sealing ring which cooperates with a sleeve provided in one of the working chambers such that when the sealing ring of the smaller diameter portion is moved against the sleeve, the extension of the gas spring is initially blocked. In order to bring the gas spring to the fully extended position and the flap to its fully extended position, the piston must be manually moved further in the extension direction by manual force until the gas spring begins to move automatically. By opening a valve disposed in the piston, however, this blocking position can be canceled, so that the flap can also swing continuously from the closed position to the fully open position.

task Therefore, it is a blockable slide column of the invention to create the type mentioned above, which is a largely constant Exceeding speed of the gas spring ensured.

These Task is inventively characterized solved, that in one or more of the groove bottom radially to the first groove side wall Outside leading, axially to the annular groove open radial nozzle grooves are formed and that at Installation of the sealing ring on the second working chamber closer second groove side wall the sealing ring can not be flowed around is.

A further solution of the problem is that in the closer to the first working chamber area of the groove bottom of the annular groove one or more axially to the longitudinal axis of the guide tube extending, the annular groove open towards Axialdüsennu are arranged, which are in communication with one or more radial grooves in the first groove side wall and that upon contact of the sealing ring on the second working chamber closer to the second groove side wall of the sealing ring is not flowed around.

There to a close the second valve means the Radialdüsennuten or Axialdüsennuten always open towards the ring groove can, can Dirt in the radial nozzle grooves or axial nozzle grooves while of the closing process the second valve device by the flowing compressed gas well out of the open radial groove or axial nozzle groove be blown out, so that no clogging possible is.

at open second valve means is the groove opening through the at the first Nut side wall adjacent sealing ring covered, so that only the groove cross-section than the extension speed determining Cross section for flowing through of the compressed gas available stands.

In addition to the axial nozzle grooves can also the radial grooves as Radialdüsennuten be formed and co-determine the Ausfahrgeschwindigkeit.

Around to avoid that at a use of a soft material of the sealing ring this in case of concerns on the first groove side wall partially in the Radialdüsennuten deform and the passage cross section of Radialdüsennuten is preferably axially between the first groove side wall and the sealing ring in the annular groove an underflowable dimensionally stable support ring axially movably arranged. For evenly covering the radial nozzle grooves and for axially supporting the Sealing ring, the support ring have a rectangular cross-section.

is the support ring on the inner wall of the guide tube guided axially displaceable, so its proper underflow is guaranteed.

To a slight changeover of the second valve device leads, if the support ring from one opposite the inner wall of the guide tube friction Material exists.

is the first groove side wall of a fixedly connected to the piston, the one or more radial nozzle grooves or radial grooves having nozzle disk formed, so there is a simple manufacturability of Radialdüsennuten or radial grooves.

there it may be during assembly of the nozzle disk Do not come to a mounting error when the nozzle disc on both sides with a or a plurality of radial nozzle grooves or radial grooves, since the nozzle disk with each of their Both sides can form the first groove side wall.

A easy installation of piston and nozzle disc on the piston rod is thereby enabled that the Piston rod with her the first working chamber facing the end one to the longitudinal axis of the guide tube Coaxial piston bore of the piston and a coaxial disc bore of nozzle disk protrudes and is deformed rivet-like at its free end.

To the Ensure underflowability of sealing ring and support ring when open second valve means may in the closer to the first working chamber area the groove bottom of the annular groove is axially to the longitudinal axis of the guide tube extending connection, which is at one end connected to the one or more radial nozzle grooves or radial grooves is.

To can the closer to the first working chamber area of the annular groove relative to the closer to the second working chamber Area of the annular groove a greater depth and with the Radialdüsennuten keep in touch.

embodiments The invention are illustrated in the drawings and will be described in more detail below. Show it

1 a slide column in cross section

2 an enlarged section of the slide column after 1 with closed second valve device

3 an enlarged section of the slide column after 1 with the second valve device open

4 a cross section of a piston of the slide column after 1

5 a plan view of the piston of the slide column after 1

6 A second embodiment of a piston for a slide column after 1

7 a plan view of the piston to 6

8th a side view of a nozzle disk of the slide column after 1

9 a cross section of the nozzle disk after 8th

10 a cross-section of a first valve means for a slide column after 1 ,

The illustrated slide column for a chair has a standpipe 1 , Can be arranged at the lower portion of reduced diameter chair legs, not shown.

At the lower end of the standpipe 1 is a support floor 2 firmly inserted, at which the free end of a piston rod 3 a gas spring 4 around its longitudinal axis 5 is mounted rotatably supported axially.

The gas spring 4 has a printing cylinder 6 placed in one in the top of the standpipe 1 inserted guide bush 7 is guided axially displaceable and from the upper end of the standpipe 1 protrudes. The from the standpipe 1 outstanding end of the printing cylinder 6 is as a cone 8th formed for receiving a seat support, not shown.

Coaxial within the impression cylinder 6 is a filled with a pressurized gas guide tube 9 so firmly arranged that between pressure cylinder 6 and guide tube 9 an annular gap 10 is formed.

The annular gap 10 is at the piston rod outlet end of the gas spring 4 with the interior of the guide tube 9 connected.

The piston rod 3 is sealed in the guide tube 9 led in and carries at her in the guide tube 9 protruding end of a piston 11 holding the interior of the guide tube 9 in a first working chamber 12 and a second working chamber 13 divided and slidable in the guide tube 9 is guided.

The upper end of the guide tube 9 is from a shutter wall 14 locked.

From the annular gap 10 leads in the closure wall 14 a radial bore 15 to one in the closure wall 14 arranged as a shut-off valve 16 formed first valve unit, through which a bypass line from the first working chamber 12 , about the radial bore 15 and the annular gap 10 to the second working chamber 13 can be produced.

The shut-off valve 16 has a coaxial hole 17 the closure wall 14 sliding valve slide 18 coming from its closed position by an actuating tappet 19 to the first working chamber 12 can be acted upon in its open position.

The coaxially displaceable guided actuating tappet 19 protrudes with his the valve spool 18 opposite end to the outside and is opposite to the valve spool 18 axially acting pressure force of the compressed gas in the first working chamber 12 manually acted upon in the opening direction.

The piston 11 has on its cylindrical surface a radially open, circumferential annular groove 20 in which a sealing ring 21 is arranged from an elastic material, in the annular groove 20 is free to move axially.

The sealing ring 21 lies with radial prestress on the inner wall 22 of the guide tube 9 at.

To the side of the closure wall 14 is the ring groove 20 from a first groove side wall 23 and piston rod side is the annular groove 20 from a second groove side wall 24 limited. The first groove side wall 23 is from a separate nozzle disk 25 educated.

The piston 11 is a plastic part and has one to the longitudinal axis 5 coaxial piston bore 26 with which he puts on the piston rod 3 deferred until he has a likewise on the piston rod 3 deferred support disk 27 at one the piston rod 3 in a radially circumferential groove inserted snap ring 28 in attachment.

Thereafter, the nozzle disk 25 with its coaxial disc bore 29 on the piston rod 3 deferred and the support disk 27 , Piston 11 and nozzle disk 25 existing package by rivet-like deformation of the in the first working chamber 12 projecting free end of the piston rod 3 fixed on this.

In one to the piston bore 26 and to the support disk 27 towards open annular groove of the piston 8th is another sealing ring 30 the piston rod 3 arranged enclosing.

Between the sealing ring 21 and the nozzle disk 25 is in the ring groove 20 continue a dimensionally stable support ring 31 arranged with a rectangular cross-section, with its radially circumferential surface on the inner wall 22 of the guide tube 9 is guided axially displaceable.

seal 21 and support ring 31 have a common axial width which is less than the axial width of the annular groove 20 so that they are in the annular groove 20 are axially displaceable.

In the first working chamber 12 closer area of the groove bottom 32 the ring groove 20 is an axial to the longitudinal axis 5 of the guide tube 9 extending connection, which extends to the nozzle disc 25 leads.

In the embodiment of the 1 to 5 is this connection of one in the groove bottom 32 trained axial nozzle groove 33 formed, which has a V-shaped cross-section.

In the embodiment of the 6 and 7 this compound is formed by that of the first working chamber 12 closer range 34 the ring groove 20 opposite to the second working chamber 13 closer area 35 the ring groove 20 a greater depth, ie the piston 8th So has a smaller diameter.

The nozzle disk 25 is on its two side surfaces with radial nozzle grooves 36 V-shaped cross section formed.

It is the annular groove 20 facing radial nozzle groove 36 with the axial nozzle groove 33 or with the area 34 of the groove bottom 32 in connection.

Is the slide column loaded and located in the in 1 shown Teilingefahrenen position and is now relieved, so shifts in the first working chamber 12 existing pressure the piston 11 and the piston rod 3 in the extension direction, so that the pressure cylinder 6 with the guide tube 9 from the standpipe 1 moved upwards.

At the same time the sealing ring moves 21 from his to the 1 and 2 shown on the second groove side wall 24 adjoining closure position in his in 3 illustrated opening position.

This allows pressurized gas from the second working chamber 13 around the support disk 27 and the second groove sidewall 24 around in the ring groove 20 get there and through the Axialdüsennut 33 or the area 34 of the groove bottom 32 the sealing ring 21 and the support ring 31 underflow and over the radial nozzle groove 36 and by flowing around the nozzle disk 25 in the first working chamber 12 reach.

This controlled by the cross sections of radial groove and axial groove groove extension movement is carried out until the piston 11 on the closure wall 14 comes to the plant.

For retracting pistons 11 and piston rod 3 must the shut-off valve 16 opened and the pressure cylinder 6 in the standpipe 1 be charged into it.

Due to the resulting increase in pressure in the first working chamber 12 against the pressure in the second working chamber 13 becomes the sealing ring 21 in his at the second groove side wall 24 applied closing position moves so that compressed gas from the first working chamber 12 only over the open shut-off valve 16 and the annular gap 10 in the second working chamber 13 can flow.

Once the shut-off valve 16 is closed, the desired chair height is set.

1

standpipe

2

support base

3

piston rod

4

gas spring

5

longitudinal axis

6

pressure cylinder

7

guide bush

8th

cone

9

guide tube

10

annular gap

11

piston

12

first working chamber

13

second working chamber

14

closure wall

15

radial bore

16

shut-off valve

17

drilling

18

valve slide

19

fixing tappet

20

ring groove

21

seal

22

inner wall

23

first groove side wall

24

second groove side wall

25

nozzle disk

26

piston bore

27

support disc

28

snap ring

29

wheel bore

30

seal

31

support ring

32

groove base

33

Axialdüsennut

34

Area

35

Area

36

Radialdüsennuten

Claims (12)

Object carrier column with a gas spring, which has a closed on both sides guide tube, which filled with a compressed gas or compressed gas / oil mixture interior is divided by a displaceable piston in a first working chamber and a second working chamber, with a fixed to the piston with its one end piston rod , which is guided through the second working chamber and sealed to the outside, with a manually operable first valve means, by which the first working chamber with the second working chamber, the piston is immediately connectable and with a second valve means, through which the second Ar beitskammer with the first working chamber is connectable, wherein the second valve means comprises a radially on the cylindrical surface of the piston radially open circumferential groove in which a sealing ring of an elastic material is arranged axially movable, which is in tension with the inner wall of the guide tube and when installation of the sealing ring at the first working chamber closer first groove side wall in the region of the groove bottom is flowed, wherein the closer to the first working chamber area of the groove bottom is connected via a flow connection with the first working chamber, characterized in that in the first groove side wall ( 23 ) one or more of the groove bottom ( 32 ) leading radially outward, axially to the annular groove ( 20 ) radial grooves ( 36 ) are formed and that when the sealing ring ( 21 ) on the second working chamber closer to the second groove side wall ( 24 ) The sealing ring is not flowed around. Object carrier column with a gas spring, which has a closed on both sides guide tube, which filled with a compressed gas or compressed gas / oil mixture interior is divided by a displaceable piston in a first working chamber and a second working chamber, with a fixed to the piston with its one end piston rod , which is guided through the second working chamber and sealed to the outside, with a manually operable first valve means, by which the first working chamber with the second working chamber, the piston is immediately connectable and with a second valve means, through which the second with the first working chamber connectable is, wherein the second valve means comprises a cylindrical circumferential surface of the piston radially open circumferential annular groove in which a sealing ring of an elastic material is arranged axially movable, which is biased against the inner wall of the guide tube in Appendix and Anla ge of the sealing ring at the first working chamber nearer first groove side wall is underflowed in the region of the groove bottom, wherein the closer to the first working chamber area of the groove bottom is connected via a flow connection with the first working chamber, characterized in that in which the first working chamber ( 12 ) closer area of the bottom of the groove ( 32 ) of the annular groove ( 20 ) one or more axially to the longitudinal axis ( 5 ) of the guide tube ( 9 ) extending, to the annular groove ( 20 ) Axialdüsennuten open ( 33 ) are arranged with one or more radial grooves in the first groove side wall ( 23 ) and that when the sealing ring ( 21 ) on the second working chamber closer to the second groove side wall ( 24 ) The sealing ring is not flowed around. A slide column according to claim 2, characterized in that the radial grooves are designed as radial nozzle grooves ( 36 ) are formed. Object-carrying column according to one of the preceding claims, characterized in that axially between the first groove side wall ( 23 ) and the sealing ring ( 21 ) in the annular groove ( 20 ) an underflowable dimensionally stable support ring ( 31 ) is arranged axially movable. Object-carrying column according to claim 4, characterized in that the support ring ( 31 ) has a rectangular cross-section. Object-carrying column according to one of claims 4 or 5, characterized in that the support ring ( 31 ) on the inner wall ( 22 ) of the guide tube ( 9 ) is guided axially displaceable. Slide column after one of claims 4 to 6, characterized in that the support ring from a relative to the Inner wall of the guide tube low-friction material. Object-carrying column according to one of the preceding claims, characterized in that the first groove side wall ( 23 ) of one with the piston ( 11 ) having one or more radial nozzle grooves ( 36 ) or radial grooves ( 25 ) is formed. A slide column according to claim 8, characterized in that the nozzle disc ( 25 ) on both sides with one or more Radialdüsennuten ( 36 ) or radial grooves is provided. Object-carrying column according to one of claims 8 or 9, characterized in that the piston rod ( 3 ) with her the first working chamber ( 12 ) end facing one to the longitudinal axis ( 5 ) of the guide tube ( 9 ) coaxial piston bore ( 26 ) of the piston ( 11 ) and a coaxial disc bore ( 29 ) of the nozzle disk ( 25 ) and is riveted at its free end rivet-like. A slide column according to claim 1, characterized in that in the first working chamber ( 12 ) closer area of the bottom of the groove ( 32 ) of the annular groove ( 20 ) one axially to the longitudinal axis ( 5 ) of the guide tube ( 9 ) is formed, which at one end with the one or more radial nozzle grooves ( 36 ) or radial grooves is connected. A slide column according to claim 11, characterized in that that of the first working chamber ( 12 ) closer range ( 34 ) of the annular groove ( 20 ) compared to the second working chamber ( 13 ) closer area ( 35 ) of the annular groove ( 20 ) has a greater depth and with the Radialdüsennuten ( 36 ).