JPH0132904Y2 - - Google Patents

Abstract

1. Longitudinally displaceable pneumatic spring for a lockable lifting device for the infinitely variable adjustment of seats, table tops or the like, with an at least predominantly cylindrical housing from one end of which project coaxially a piston rod (10) and from its other end coaxially an actuating push rod (26) for longitudinal adjustment purposes, with, extending the housing (9) coaxially and enclosing the actuating push rod (26), a fixing portion for attachment to a hub provided on the seat or on the table top and with, disposed for displacement in the fixing portion (21) and adapted to abut the actuating push rod (26), a sliding member (27) comprising an axially screw-adjustable outer surface for substantially clearance free abutment on an actuating lever (35), characterised in that the sliding member (27) is non-rotatably guided in the fixing portion (21), for which purpose the sliding member (27) has, bearing on a guide face (34) of the fixing portion (21), a guide portion (33) of non-circular cross-section.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vertically adjustable gas spring part according to the prerequisite concept of claim 1 of the patent application.

In the longitudinally adjustable gas spring part known from German utility model no. movably arranged within the section. It was already known to make such slides from plastic and to arrange them movably in fixed parts without additional guides. Furthermore, it is already known that a screw is coaxially screwed into the slider from the outside, and the screw head of this screw forms a contact surface against which an operating lever for operating the operating push rod of the gas spring part comes into contact. It is. In this case, by adjusting the position of the screw in the axial direction of the gas spring part,
It is possible to prevent a gap from occurring between the abutting surface and the operating lever. However, when the screw is rotated to adjust its position (adjust the height of the screw head), the slider also rotates, making it impossible to adjust the position of the screw.

An object of the present invention is to provide a gas spring portion in which the slider does not rotate even when the screw is rotated, and therefore the position of the screw can be easily adjusted.

In order to solve the above problem, the present invention is characterized in that the slider is guided in a fixed part in a non-rotatable manner.

According to the present invention, since the slider is guided in a fixed part in a non-rotatable manner, even if the screw screwed into the slider is rotated, the slider does not rotate, and thus the position of the screw cannot be adjusted. It can be done easily.

Utility model patent claim 2 makes it easy to make the slider non-rotatable, and utility model patent claim 3 provides a particularly advantageous configuration. By the means recited in claim 4 of the utility model registration, the slider can be guided over the entire movement path of the slider so that no relative rotation occurs between the slider and the fixed part. Therefore, there is no risk that the slider will become stuck in the fixed part. In this case, it would be advantageous if the slider could be prevented from falling off during transportation, in accordance with claim 5 of the utility model registration.

Next, the present invention will be explained with reference to examples.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The lockable lifting device shown in the accompanying drawings for stepless adjustment of the height of the deck of a chair or table has a lower guide tube 1 . The lower guide tube 1 is of approximately cylindrical design and has in its lower region a portion 2 that tapers conically downwards;
This part 2 is used for reception in a corresponding boss 3 of the pedestal 4. The guide tube 1 is provided with a base plate 5 near its lower end, which base plate 5 has an opening 7 concentric with respect to the central longitudinal axis 6 of the entire lifting device and thus with respect to the central longitudinal axis of the guide tube 1 . Also provided parallel to the longitudinal axis 6 is a gas spring part 8 which is vertically adjustable and can be locked hydraulically or pneumatically. The cylindrical casing 9 of the gas spring part 8 is located in the upper region of the guide tube 1 and projects upwards therefrom. On the other hand, a piston rod 10 of the gas spring section 8 projects downward from the casing 9 and is removably connected to the bottom plate 5. Furthermore, the free end of the piston rod 10 is designed as a plug 11 of reduced diameter, in which a thrust ball bearing 12 is arranged. The upper race 13 of the thrust ball bearing 12 is supported by an annular collar 14 formed at the transition between the plug 11 and the piston rod 10, while the lower race 15 is
It is supported by a bottom plate 5. Furthermore, the plug part 11
A holding ring 16 is attached to the holding ring 1.
6 holds the thrust ball bearing 12 in the position shown even when the lower race 15 is not supported by the bottom plate 5.

The plug 11 passes through the opening 7 with sufficient radial play of a few tenths of a millimeter to one millimeter, so that the piston rod 10 is not radially tightened relative to the guide tube 1. .
A washer 17 is attached to the plug 11 from the outside, ie from the bottom, the diameter of the washer 17 being larger than the diameter of the opening 7. A fixing element 18 is also mounted to this, so that the piston rod 10 of the gas spring part 8 is axially fixedly but removably connected to the guide tube 1 . On the piston rod 10 there is a substantially annular cylindrical end damper or stop damper 19 made of rubber, which rests with its underside against the upper race 13 of the thrust ball bearing 12.

The cylindrical through-hole casing 9 of the gas spring part 8 is
It is likewise arranged in a cylindrical tube 20 over almost its entire length by a push fit, i.e. the radial play between the casing 9 and the tube 20 is only a few hundredths of a millimeter or at most a tenth of a millimeter. Or two-tenths of a millimeter. Therefore, this game
is of such a size that the casing 9 of the gas spring part 8 can be inserted into the tube 20 or pulled out from the tube 20. At the same time, the housing 9 is guided and held in the tube 20 in the radial direction. The tube 20 forming the releasable part of the gas spring part 8 is provided in its upper region, which projects beyond the housing 9, with a conically tapering fastening part 21. The fastening part 21 is provided with a correspondingly formed boss 22 and is used to form a fastening bayonet connection which is easily produced. The boss 22 is fixed to the underside of a chair, easy chair, table deck, etc.
At the transition to the fixed part 21, a sleeve 23 is formed in the tube 20 corresponding to the taper of the tube 20.
is arranged, i.e. the sleeve 23 is connected to the fixed part 2
It is axially fixed in the direction of 1. The casing 9 of the gas spring section 8 is fixed in the axial direction by this sleeve 23.

The casing 9 has a releasable fixing element 24
from the other side in the tube 20, i.e. the tube 20
is secured from the lower free end of the This fixing element 24 is designed as a ring with a plurality of elastic projections inclined with respect to the longitudinal direction of the tube 20. This ring is inserted into the tube 20 from the lower end of the tube 20 until it comes into contact with the casing 9 and locks the casing 9, but after insertion, the protrusion is supported in the shape of an inverted hook on the inner surface of the tube 20. , to prevent it from falling out of the tube 20. On the other hand, if the protruding piece supported on the inner surface of the tube 20 is pushed downward using a tool such as a screwdriver, the ring can be moved into the tube 20.
It can be easily taken out from 0, thereby easily uncoupling the casing 9 and the pipe 20. It is of course also possible to use other fastening elements, such as screws.

The tube 20 forming the removable part of the gas spring part 8 is mounted axially displaceably in the guide tube 1 as usual, for which purpose the guide tube 1 has a suitable position in its upper region. A guide bushing 25 made of plastic is provided. In contrast, guide tube 1 and tube 20 are made of steel. The casing 9 of the gas spring part 8 is also made of steel, while the sleeve 23 is made of a soft material, such as die-cast zinc.

The vertical adjustment of the gas spring part 8, and therefore the height adjustment of the entire lifting device, is performed using the piston rod 1 of the gas spring part 8.
This is done by operating the operating push rod 26 that protrudes from the upper end on the side opposite to 0. This operation push rod 26
are pushed into the casing 9 to allow appropriate longitudinal adjustment. For this purpose, a slide 27 is arranged in the fixing part 21, which tapers conically upwards, and projects upwards from the fixing part 21. The slider 27 has a contact surface 2
8 makes contact with the operating push rod 26. Furthermore, this slider 27 is provided with projections 29 which engage elastically towards the rear of a corresponding ring 30 attached to the sleeve 23.
Thereby, the contact surface 28 comes into contact with the operating push rod 26 sufficiently without play, and the slider 27 is prevented from accidentally slipping out or being pulled out from the fixed part 21. It goes without saying that the projection 29 of the slider 27 can freely slide along the inner surface of the sleeve 23 in order to insert the operating push rod 26 into the casing 9. This operation
This is done by means of a pivotable operating lever 35, which is normally mounted in the boss 22. The operating lever 35 contacts a contact surface 36 of the slider 27 whose position is adjustable in the axial direction. This contact surface 36 is formed by the screw head of the screw 31, and the screw 31 is
It is screwed into a corresponding coaxial recess 32 in the slider 27. The dimensions of the screw 31 and the recess 32 are selected such that the screw 31 with a wood thread is automatically retained in the plastic slide 27. The screw 31 has its contact surface 3
The slider 27 is moved such that the slider 6 contacts the operating lever 35 without any play, that is, the operating lever 35 has a play that the user does not notice.
It is screwed inside. A screw 31 formed as a grooved screw or a hexagonal screw is attached to the slider 27.
slider 27 so that it can be easily screwed into or removed from slider 27.
is non-rotatably arranged in the fixed part 21. Furthermore, as can be seen in FIG. 2, the sleeve-like upper guide part 33, which rests against the inner wall of the fastening part 21, has a polygonal cross-section, for example an octagonal cross-section. The generatrix lines of this guide portion 33 extend parallel to each other. Correspondingly, the inner wall of the fixed part 21 is formed as an octagonal guide surface 34, which guide surface 3
The dimensions of 4 are selected such that the guide part 33 can slide along the guide surface 34 without tightening, but without twisting. That is, the guide surface 34 projects downwardly beyond the guide portion 33 by an amount that allows the operating push rod 26 to be inserted into the casing 9.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a lockable lifting device with a vertically adjustable gas spring according to the present invention, and FIG. 2 is a sectional view taken along the line - of FIG. DESCRIPTION OF SYMBOLS 1... Guide tube, 8... Gas spring part, 9... Casing, 10... Piston rod, 20... Tube, 21
...Fixed part, 27...Slider.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A gaze spring part of a lockable elevating device for steplessly adjusting the position of furniture components such as the seat of a chair or the deck of a table, which is located in the longitudinal direction. An operating push rod 26 which is adjustable and lockable and for adjusting the position of the casing 9 and the gas spring part 8 in the longitudinal direction;
An operating push rod 26 coaxially protrudes from one end of the
and a piston rod 11 coaxially protruding from the other end of the casing 9, and a fixing part 21 for immovably fixing the gas spring part 8 to the boss 22 of the furniture component in the longitudinal direction is attached to the casing 9. A slider 27 is provided coaxially extending from the one end, and is slidably guided in the fixed portion 21, and the slider 27 has an abutment surface 28 that abuts the operation push rod 26, and a boss 22.
and a position-adjustable contact surface 36 against which the operating lever 35 supported by the control lever 35 contacts, and the position-adjustable contact surface 36 is formed by a screw head of a screw 31 screwed into the slider 27 in the longitudinal direction. In the gas spring section where the slider 27
A gas spring part characterized in that it is non-rotatably guided in a fixed part 21. (2) The slider 27 is attached to the guide surface 34 of the fixed part 21.
The gas spring portion according to claim 1, characterized in that it has a guide portion 33 that abuts on the rim and has a non-circular cross section. (3) The gas spring section according to claim 2 of the utility model registration, wherein the guide portion 33 and the guide surface 34 have a polygonal cross section. (4) The guide portion 33 and the guide surface 34 are each formed by mutually parallel generatrix lines, according to any one of claims 1 to 3 of the utility model registration claims. Gas spring part as described. (5) The slider 27 is provided with at least one protrusion 29 that protrudes laterally with respect to the sliding direction of the slider 27, and the protrusion 29 is provided with at least one protrusion 29 that extends in the sliding direction away from the casing 9 of the slider 27. A ring 3 fixedly provided in the fixed part 21
characterized in that it can be locked by 0;
A gas spring portion according to any one of claims 1 to 4 of the utility model registration claims.