DK154467B

DK154467B - MANUAL ADJUSTMENT FOR A HEAD ADJUSTABLE HEIGHT

Info

Publication number: DK154467B
Application number: DK126379AA
Authority: DK
Inventors: Sven Magnus Klevstad
Original assignee: Landstingens Inkopscentral
Priority date: 1978-03-30
Filing date: 1979-03-28
Publication date: 1988-11-21
Also published as: FR2420945A1; DE2912565C2; DE2912565A1; SE410817B; DK126379A; NL7902390A; NO791050L; SE7803586L

Description

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Den foreliggende opfindelse angår en manøvreringsindretning for en stol, der kan justeres i højden, hvilken indretningen er af den i indledningen til krav 1 angivne art.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a height-adjustable chair operating device which is of the kind specified in the preamble of claim 1.

På en kendt måde har gasfjederens stempelstang i sin nedre ende en axialt bevægelig reguleringspind, som kan skubbes til påvirkning af en ventil i gasfjederens stempel og derved frigøre fjederen til at blive justeret til den ønskede længde. Reguleringspinden kan påvirkes ved hjælp af et fodbetjent reguleringselement i form af en ring eller skive med sin omkreds koncentrisk med stempelstangen og bevægeligt lejret i sin centrale del således, at når reguleringselementet presses nedad ved hjælp af en fod på et hvilket som helst sted langs dets omkreds vil reguleringselementets centrale del bevæge reguleringspinden til påvirkning af ventilen og frigørelse af fjederen til justering. En sådan fodbetjent reguleringsindretning er kendt f. eks. fra DE-OS 1.900.949.In a known way, the piston rod of the gas spring has at its lower end an axially movable control pin which can be pushed to actuate a valve in the piston of the gas spring, thereby releasing the spring to be adjusted to the desired length. The control stick can be actuated by a foot-operated control element in the form of a ring or disc with its circumference concentric with the piston rod and movably mounted in its central portion such that when the control element is pressed downwardly by a foot at any location along its circumference the central part of the control element will move the control pin to actuate the valve and release the spring for adjustment. Such a foot-operated control device is known, for example, from DE-OS 1.900.949.

I den kendte indretning er det fodbetjente reguleringselement en cirkulær skive som er fastgjort til en ax-sialt giidelig bøsning, således at når skiven nedtrykkes vil den påvirke en vægtarm, som skubber reguleringspinden til frigørelse af gasfjederen.In the known device, the foot-operated control element is a circular disc which is attached to an axially positive sleeve, so that when the disc is depressed it will actuate a weight arm which pushes the control pin to release the gas spring.

Imidlertid er den fodbetjente skive placeret oven over de radiale ben som understøtter stolen og således vil skiven være placeret i en højde over gulvet, som ikke kan være lavere end højden af den ramme som dannes af de radiale ben. Det vil således være nødvendigt at stå på den ene fod og påvirke kontrolelementet med den anden fod, det vil sige vægten af den person som anvender stolen vil hovedsagelig hvile på alene den ene af hans fødder. Denne ubalancerede tilstand vil også fremkomme når man anvender det fodbetjente reguleringselement der er beskrevet i US-PS 3.143.332, hvor kontrolelementet er en vipbar lejret reguleringsring anbragt i en fri højde over stolens basis.However, the foot operated disc is positioned above the radial legs supporting the chair and thus the disc will be located at a height above the floor which cannot be lower than the height of the frame formed by the radial legs. Thus, it will be necessary to stand on one foot and influence the control element with the other foot, that is, the weight of the person using the chair will rest mainly on one of his feet alone. This unbalanced condition will also appear when using the foot operated control element described in US Pat. No. 3,143,332, wherein the control element is a tiltable mounted control ring located at a free height above the base of the chair.

Enhver ubalance i denne siddende eller stående stilling for en person, der er engageret i et arbejde, som kræver en høj grad af præcision, sådan som det er tilfældet for doktorer, og sygeplejersker på hospitaler, vil imidlertid inde-However, any imbalance in this sitting or standing position for a person engaged in a job that requires a high degree of precision, as is the case for doctors and nurses in hospitals, will involve

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2 bære en risiko for ulykker under arbejdet. Det er derfor formålet med den foreliggende opfindelse at tilvejebringe en stol af den omhandlede type, med hvilken den person, som benytter stolen, kan opetholde en sikker understøttelse på begge fødder under betjening af det fodbetjente reguleringselement.2 carry a risk of accidents at work. It is, therefore, an object of the present invention to provide a chair of the type in question with which the person using the chair can maintain a secure support on both feet while operating the foot operated control element.

Dette opnås ifølge opfindelsen ved hjælp af en stol, der er ejendommelig ved,at der ved trykpindens ende er anbragt en trykplade, som har en i det væsentlige cirkulær omkreds og ligger koaksialt med trykpinden og på sin overside er påvirket af en trykfjeder i retning fra trykpinden og til anlæg med sit kantparti på pladens underside mod en fast støtteoverflade og at trykpladen er fast forbundet med manøvreringsorganet, som ligger koncentrisk med stempelstangens centerakse, idet skråstilling af manøvreringsorganet medfører skråstilling af trykpladen, hvis midterparti påvirker trykpinden direkte eller indirekte og åbner ventilen. Den fod, som anvendes til at nedtrykke reguleringselementet kan således hvile på reguleringselementet, som igen hviler på gulvet, og dermed vil denne fod have i det væsentlige normal støtte på gulvet under reguleringen af sædets højde. Desuden vil reguleringsringen eller reguleringsskiven have en så lav højde, at den let kan nås af foden blot ved at løfte hælen til indgreb i ringen eller skiven, mens den forreste del af foden stadig holdes i støttende kontakt med gulvet.This is achieved according to the invention by means of a chair, characterized in that a pressure plate is provided at the end of the push pin which has a substantially circular circumference and coaxially with the push pin and is influenced on its upper side by a pressure spring in the direction of the thrust pin and for abutment with its edge portion on the underside of the plate against a fixed support surface and the thrust plate being firmly connected to the actuator which is concentric with the center axis of the piston rod, inclination of the actuator causes slanting of the thrust plate whose center portion affects the thrust pin directly or indirectly and opens the valve. Thus, the foot used to depress the control member may rest on the control member, which in turn rests on the floor, and thus this foot will have substantially normal support on the floor during the control of the seat height. In addition, the adjusting ring or adjusting disc will have such a low height that it can be easily reached by the foot simply by lifting the heel for engagement with the ring or disc, while still maintaining the front of the foot in supporting contact with the floor.

En foretrukket udførelsesform for stolen ifølge opfindelsen er som et eksempel vist på tegningen.A preferred embodiment of the chair according to the invention is shown by way of example in the drawing.

På tegningen viser fig. 1 et skematisk perspektivbillede af en stol i-følge opfindelsen, og fig. 2 et tværsnit gennem den centrale del af reguleringselementet til påvirkning af gasfjederens reguleringspind.In the drawing, FIG. 1 is a schematic perspective view of a chair according to the invention; and FIG. 2 is a cross-section through the central portion of the control element to actuate the throttle spring control pin.

Den viste stol har et sæde 10, og om ønsket kan den også have armlæn og et ryglæn.The chair shown has a seat 10 and, if desired, can also have armrests and a backrest.

Sædet er understøttet af en cylinder 11 som har et stempel (ikke vist) og en stempelstang 12 der strækker sigThe seat is supported by a cylinder 11 having a piston (not shown) and a piston rod 12 extending

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3 nedad. Cylinderen med dens stempel og stempelstang er en konventionel gasfjeder, som normalt er låst, men kan frigøres ved at man skubber til en reguleringspind 13 i den nedre ende af stempelstangen. Når reguleringspinden skubbes frigøres en ventil i stemplet, således at gasfjederen kan justeres til den ønskede længde.3 down. The cylinder with its piston and piston rod is a conventional gas spring which is normally locked but can be released by pushing to a regulating pin 13 at the lower end of the piston rod. When the control pin is pushed, a valve is released in the piston so that the gas spring can be adjusted to the desired length.

Gasfjederen danner stolens centrale stolpe. Den nedre endedel af stempelstangen 12 er fastgjort til et hus 14, hvortil der er fastgjort et antal radiale ben 15, som er anbragt med en afstand fra gulvet 16 ved hjælp af fødder 17 i benenes ydre ender.The gas spring forms the central post of the chair. The lower end portion of the piston rod 12 is attached to a housing 14 to which is attached a plurality of radial legs 15 spaced from the floor 16 by feet 17 at the outer ends of the legs.

I den nedre ende 14a af det cylindriske hus er der anbragt en cirkulær trykplade 18, som holdes i indgreb ved en stationær understøttelse i form af en ring 19, der er fastgjort til husets inderside. Pladen 18 holdes mod denne ring ved hjælp af en fjeder 20.At the lower end 14a of the cylindrical housing is arranged a circular pressure plate 18 which is held in place by a stationary support in the form of a ring 19 attached to the inside of the housing. The plate 18 is held against this ring by a spring 20.

Mellem trykpladen og reguleringspinden er et axialt bevægeligt dykkerstempel 21.Between the pressure plate and the control stick is an axially movable plunger 21.

Som det ses på fig. 2 kan pladen 18 vippes til en skrå stilling som illustreret med streg-prik-linier. Ved vipning af pladen vil dens centrale del blive løftet og påvirke dykkerstemplet 21, som igen vil presse reguleringspinden 13 til påvirkning af fjederens ventil og frigørelse af fjederen.As seen in FIG. 2, plate 18 can be tilted to an oblique position as illustrated by dash-dotted lines. Upon tilting the plate, its central portion will be lifted and actuate the plunger 21, which in turn will push the regulating pin 13 to actuate the spring valve and release the spring.

Et antal radiale arme 22 er fastgjort på trykpladen og understøtter en reguleringsring 23, der er koncentrisk med stempelstangen 12. Denne ring kan om ønsket erstattes af en cirkulær skive. Som det vil ses af fig. 2 er reguleringsringen 23 placeret i rummet mellem gulvet 16 og de radiale ben 15 i en relativ lav højde over gulvet, således at ringen let kan nås af fodens hæl på den person som benytter stolen.A plurality of radial arms 22 are attached to the pressure plate and support a control ring 23 which is concentric with the piston rod 12. This ring may be replaced by a circular disc if desired. As will be seen from FIG. 2, the control ring 23 is located in the space between the floor 16 and the radial legs 15 at a relatively low height above the floor, so that the ring can be easily reached by the heel of the foot of the person using the chair.

Ved nedtrykning af en hvilken som helst del af ringen 23 langs dens periferi vil ringen blive vippet og kan indtage den skrå stilling som vist med streg-prik-linier, hvori ringen hviler mod gulvet under tryk af foden på den person som benytter stolen. I denne stilling har pladens centrale del løftet dykkerstemplet til at trykke reguleringspinden til dens operationsstilling til frigørelse af gasfjederen.By depressing any portion of the ring 23 along its periphery, the ring will be tilted and may assume the oblique position as shown by dash-dotted lines in which the ring rests against the floor under pressure of the foot of the person using the chair. In this position, the central part of the plate has raised the plunger to press the regulating pin to its operating position to release the gas spring.

Claims

DK 154467 B Maneuvering device for chairs with a seat (10) - which is carried by a central post, which is fixed by a leg rack with radial legs, the post consisting of a gas spring adjustable for different lengths, with a compressed gas cylinder (11) including a piston and a downwardly directed piston rod having a thrust pin (13) axially projecting at the lower end of the piston rod, the depression of which by means of a foot operated actuator X23) opens a valve within the cylinder so that the gas spring can alternatively be extended by pushing the piston rod under the action of the compressed gas or shortening by pressing the piston rod against the action of the compressed gas, while the gas spring is locked in the set position when the push pin (13) is unaffected and the actuator (23) is tilted at its center and extends along with a web lying in a plane perpendicular to the post and concentric with the post and at such height, the maneuvering body (23). - can be actuated with one foot by the person sitting on the chair at any point along said path to tilt the actuator from a resting position to an actuating bed which results in operation of the disconnecting means, characterized in that by the push pin (13 ) is provided with a pressure plate (18) which has a substantially circular circumference and lies coaxially with the push pin and on its upper side is actuated by a pressure spring (20). in the direction from the push pin (13) and to abutment with its edge portion on the underside of the plate against a fixed support surface (19) which is fixed relative to the piston rod (12) and that the pressure plate is firmly connected (22) to the actuator (23), which is concentric with the center axis of the piston rod, with the inclination of the actuator causing the pressure plate (18) to be inclined, the middle portion of which directly or indirectly affects the thrust pin and opens the valve.