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WO1989001578A1 - Dispositif de levage a verin a gaz comprime - Google Patents

Dispositif de levage a verin a gaz comprime Download PDF

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Publication number
WO1989001578A1
WO1989001578A1 PCT/US1987/002047 US8702047W WO8901578A1 WO 1989001578 A1 WO1989001578 A1 WO 1989001578A1 US 8702047 W US8702047 W US 8702047W WO 8901578 A1 WO8901578 A1 WO 8901578A1
Authority
WO
WIPO (PCT)
Prior art keywords
plunger
cylinder
rod
fluid
head
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US1987/002047
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English (en)
Inventor
Richard S. Pauliukonis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to PCT/US1987/002047 priority Critical patent/WO1989001578A1/fr
Publication of WO1989001578A1 publication Critical patent/WO1989001578A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
    • F16F9/0209—Telescopic
    • F16F9/0245—Means for adjusting the length of, or for locking, the spring or dampers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/43—Filling or drainage arrangements, e.g. for supply of gas

Definitions

  • This invention relates to lifting devices such as adjustable length columns generally, and to servo gas cylinders used for height adjustment in structures such as chairs, stools, tops and the like with improved controls specifically.
  • a gas cylinder in connection with a column of a chair, between a chair base and a seat or similar platform subject to height adjustment wherein the cylinder of prior art design pressurized to about 200 atu ( circa 3000 psig gas pressure ) is fixed to an underside of a chair seat securely while a piston rod end is secured to a base through a stand tube also called a guide tube which generally includes a thrust bearing for seat rotation.
  • Upwards direction requires removing body weight from the seat so as to permit pressure force acting over the piston rod diameter lift the seat empty, while downwards direction requires adding external weight such as the weight of a person using chair to be placed over the seat so as to overcome constantly prevailing internal pressure force normally acting upwards. All prior art devices of this general type have no means for speed control during piston and seat position change.
  • prior art lifting devices generally require additional structure such as the stand tube spaced and secured inside a chair base in order to adequately support the outwardly protruding cylinder housing secured inside stand tube bottom in a coraplicated fashion by way of a tiny piston rod end passing a thrust bearing spaced therein.
  • factory precharge units from high pressure source of gas be it Nitrogen or Carbon Dioxide or other gas mixture
  • a totally new and different unit evolves in order to meet force reqviiretnents of structures such as chair,stool, table or the like.
  • a plurality of factory precharged units nust be maintained, inventorized and shipped under pressure, all complicating the issue and raising the costs, let alone safety high pressure dictates.
  • the present invention alleviates the above disadvantages and improves the state of the art of gas cylinders many ways.
  • operating cylinders below 500 psig rather than 3000 psig in prior art cylinders eliminates the need for extra thrust bearings due to drastically reduced pressure-induced-friction, in particular in metal cylinders which generally exhibit internal rusting and corrosion with time due to trapped moisture even with Nitrogen charge.
  • the general objects of the present invention is to overcome the deficiencies of the prior art cited, and to provide an improved lifting device through design simplification for reduced cost in manufacture and use.
  • an adjustable servo gas cylinder constructed for low pressure operation with improved safety and cylinder charge-recharge capability in the field via an integral springless check valve means incorporated inside a fluid port thereof.
  • present invention permits unit operation without external energy source except for gas filled cylinder housing provided with an axially displaceable piston of an outwardly movable rod adaptable of being stopped at a desired position between stroke limitations by an outside operable blocking device which includes metering valve for flow control between fluid chambers separated by the piston resulting in a considerably simpler construction of the unit with individual parts produced by inexpensive injection molding process wherever suitable.
  • an object of the present invention is to provide a servo lifting device that permits standardization of units by field pyessurization, de-pressurization and re-use eliminating countless numbers of models with different force magnitudes let alone different strokes, a feature not even anticipated by prior art devices but presently offered by way of integral check valve means incorporated therein.
  • Further object of the present invention is to provide servo lifting device which structurally differs from prior art designs to insure unit construction from low cost materials including injection molding parts from plastics capable of sustaining pressure and service abuse, in particular that injection molding process permits reduction of parts facilitating savings in cylinder production. lifting devices from plastics would also eliminate rust and corrosion problems plaguing prior art metal counterparts.
  • lifting devices of this general type which require fewer components and are light are obviously desirable because they provide long lasting, simple, inexpensive and reliable means for serving many applications beyond those common to the prior art.
  • airline, automotive and bicycle industries, among many others wherein reduction of weight and properties such as anticorrosion, non-conductive electrically are at premium would benefit from this novel development considerably.
  • FIG.1 is a cross-sectional view of a servo gas cylinder for adjustable height according to the invention without piston, using simple plunger with seal instead;
  • FIG.2 is a fragmentary view of gas cylinder of FIG.1 modified to include small piston at the plunger end with plunger body serving as a piston rod;
  • FIG.3 is a fragmentary view of another end of gas cylinder shown in FIG.1 modified to include external actuating means for operational control of the unit;
  • FIG.4 is a section of piston rod end provided with alternate operational control means of the unit, offered as a selective option;
  • FIG.5 is a cross-sectional view of a simple all plastic servo gas cylinder including ribbed bearing surface inside bore end for piston rod support in bending.
  • FIG.1 servo gas cylinder for adjustable height is a unit of truly simplified construction that may be produced by injection molding fron plastics but it is not limited thereto,depending on applications.
  • a rodlike pistonless hollow plunger 16 with seal 13 is slidably movable inside a dual cylinder smaller bore of plunger diameter between a first piston rod retracted position adjacent cylinder end stown and a second piston rod extended position to be defined by external stop (not shown).
  • this truly simplified cylinder can serve very well defined special applications only.
  • the discovery of this structurally novel design is significant in that it illustrates potentials for simplification.
  • an elongated tubular housing 1-a with an integral end wall 2 at a protruding plunger end 3 and an opposite end wall 5 with an integral elongated internal cylinder 5-a is adaptable of being assembled into a housing bore 20 against a shoulder of a counterbore 2-a to form an annulus 19 therebetween after a plunger assembly 12 is sealably inserted inside cylinder bore 6.
  • End wall 5 may be secured inside housing first open end 1-b by threads or otherwise fixed by either ultrasonic or friction welding or equally strong glueing techniques considered standard in plastics industry.
  • a fluid port 5-b central to the end wall 5 is provided for supply of working fluid under pressure, be it compressed air,nitrogen or carbon dioxide gas alone or mixed with lubricants for delivery into cylinder inside 8 via a springless floating check valve 7 incorporated therein.
  • working fluid under pressure be it compressed air,nitrogen or carbon dioxide gas alone or mixed with lubricants
  • Check valve 7 may include a tee-shaped floating pin 7-a with a round head 7-b at a first pin end protruding into cylinder inside 8 via an orifice 10 of port 5-b so as to receive a seal 9 inside a peripheral groove adjacent a seat surface 11, while a second opposite larger diameter pin end 7-c may be flat of tee-configuration shown or it may be winged to provide a stop for axial pin motion inside port 5-b while permitting unobstructed passage for fluid flow during cylinder charging-recharging steps.
  • the stroke is measured by the distance traveled by the seal 13 of a first plunger end Ik inside the cylinder bore 6 normally provided with appropriate abutments.
  • the plunger assembly 12 of FIG.1 has unlimited stroke, since the seal 13 can travel from the position shown passed a stationaiy housing seal 15 inside appropriate groove of end wall 2 when subjected to an end pressusure at cylinder inside 8 forcing the cylinder assembly 12 to disengage from cylinder bore 6 unless resticted externally within stroke selected between that shown in FIG.1 with plunger retracted to another (not shown) with plunger extended but not more than up to the counterbore 2-a shown.
  • the stroke of gas cylinder of FIG.1 is controlled by the application wherein external means to restrict plunger travel are present, unless plunger is provided with a head at the end Hi to act as a stop defining the stroke inside the gas cylinder boundaries in stead, as per plunger modifications shown in FIG.2.
  • Plunger assembly 12 of FIG.1 consists of hollow plunger 16, sized to fit bore 6, with central passage 17 between the plunger ends adaptable of receiving an elongated actuating rod 18 spaced inside thereof so as to terminate with a metering valve 18-a in the end 14 for regulation of fluid flow between fluid chambers at each side of the seal 13 formed inside cylinder proper when plunger assembly is urged to move axially therein.
  • actuating rod 18 is an outside operable blocking device.
  • FIG.1 identifies a first fluid chamber formed at cylinder inside 8 facing both the check valve 7 and the plunger face 23 however limited in size due to adjacent location of seal 13 which separates it from a second fluid chamber on the right thereof.
  • the second chamber of FIG.1 is formed by the annulus 19 jointly with a small annular space 19-a between the outside diameter of plunger 16 and the inner diameter of bore 6 interconnected by a radial hole 21a at the end of cylinder 5-a adjacent counterbore 2-a.
  • no motion of plunger assembly 12 will materialize until flow between chambers is established to proceed from a first fluid chaster via orifice 24 passed a metering taper 26 of the second rod end 21 into the passage 17 protected by a seal 27 30 as to direct the flow via radial hole 25 into the second fluid chamber or vice- versa, depending on the position plunger assembly 12 has assumed inside bore 6.
  • the rodlike plunger 16 in contact with inside diameter of bore 6 may also be beneficial due to an extra long bearing surface therebetween to take side loads in service reducing bending stresses developed, and for rigidity.
  • Tapers shown on the housing end by 28 as well as on plunger end 3 of FIG.1 identify most simple accepted means for unit attachement to a structure such as a chair allowing taper 28 enter a mating receiver bore of a base(not shown) while the tapered plunger end 3 may be received by a tapered receiver under the seat thereof, but they do not represent the limits.
  • Other means of unit attachement to a structure such as a chair, stool , table or the like may be selected from threaded to shouldered end configurations without departing from the scope and spirit of the invention with equal success.
  • the cylinder mounting along with attaching the plunger end into a structure in the field is selectable from tapers of FIG.1 shown alone or in combination with many other options.
  • tapers of FIG.1 shown alone or in combination with many other options.
  • the unit of FIG.1 does not have to be made from plastics.
  • FIG.2 shows an end section of FIG.1 modified structurally in small detail since operationally the gas cylinder of FIG.2 performs exactly the same function as that of FIG.1. Specifically, FIG.2 gas cylinder is aimed to serve applications that require internal restrictions with appropriate abutments for plunger stroke limitations.
  • FIG.2 plunger assembly 32 will incorporate a plunger 30 with a small head or piston 31 with shoulder 31-a serving as a stop and a seal 33 otherwise totally identical to the plunger assembly 12 of FIG.1 in all detail.
  • the actuating rod 34 of FIG.2 is the same as the actuating rod 18 of FIG.1.
  • metering valve 35 with a tapered section 36 inside orifice 37 closed by a seal 38 adjacent second rod end 39 protruding into a first fluid chamber 40 across a check valve 41 with a springless floating stem 42 provided with a seal 43 inside a groove thereof so as to render valve bubble-tight shut automatically by internal pressure of working fluid housed therein after charging the cylinder via port 44 of FIG.2,functionally identical to that of FIG.1 already described in detail.
  • plunger with head 31 providing shoulder 31-a to limit stroke against an appropriate abutment inside opposite housing end(not shown in FIG.2 but in FIG.3) when plunger 30 is fully extended increases also the volume of a second chamber formed by annulus 45 jointly with annular space 45-a formed by shoulder 31-a.
  • this compensates for difference in volumes of the opposing chambers and improves unit operation in that pressures on both sides of plunger head become equallized.
  • FIG.3 shows an end section of an opposite end of FIG.1 modified to include dual plunger seals 60 one of which may be a rod wiper spaced inside an integral end wall 61 of a housing 62, identical to that of FIG.1, plus a counterbore 61-a with an end 63 of an internal cylinder 64 abutting a shoulder 65 thereof with ample radial shoulder space to accomodate head of piston 31 with shoulder 31-a of FIG.2 therein as a stop,limiting the stroke of a hollow plunger 66 inside cylinder bore 67 of FIG.3.
  • dual plunger seals 60 one of which may be a rod wiper spaced inside an integral end wall 61 of a housing 62, identical to that of FIG.1, plus a counterbore 61-a with an end 63 of an internal cylinder 64 abutting a shoulder 65 thereof with ample radial shoulder space to accomodate head of piston 31 with shoulder 31-a of FIG.2 therein as a stop,limiting the stroke of a hollow plunger 66
  • FIG.3 shows an annulus 68 of external housing 62 in communication with an internal annual space 69 via a radial hole 70.
  • plunger 66 of FIG.3 terminating with a tapered plunger end 66-a incorporates threads 71 adaptable of receiving external controls 74 wiih mating threads inside a cap 73 provided with a flat bottom 75 which is in contact with an end 76 of an actuating rod 77 to permit gradual depression of the actuating rod downwards when external controls 14 are turned sideways by protruding handle 72 facilitating novel means of unit operation with resultant plunger position change already described.
  • FIG.4 identifies another version of external controls at the end of a tapered plunger 80 provided with threads 81 to receive a mating cap assembly 82 which includes a cap 82-a with appropriate elangated slot 83 passing therethrough and adaptable of receiving therein a substantially flat actuating handle 84 in final assembly.
  • Handle 84 is provided with a cam like surface 85 adjacent a protruding end 86 of an actuating rod 87 so as to gradually depress end 86 when handle 84 is pushed to the left forcing cam surface 85 over actuating rod end 86 externally thereby opening internal fluid passages for fluid communication between respective fluid chambers to result in plunger travel for position change in accordanwith the preceding description.
  • Pulling handle 84 to the right permits an automatic rod return to the original normally extended position rendering metering valve of FIG.1 or FIG.2 bubble-tight closed, and vice-versa.
  • plastic lifting devices have further indicated that cylinders with long strokes dictate longer bearings inside housing end containing protruding piston rod for improved rigidity is service when piston rod is extended fully beyond the cylinder end. Additional bearing length inside cylinder bore end require length increase in cylinder housing.
  • FIG.5 shows such cylinder in cross section. Basically it employs the same plunger assembly of FIG.2 and FIG.3 with elongated piston rod assembly 90 of which piston rod 91 protrudes a closed housing end 92 provided with identical seals 93 at a first end of an elongated tubular housing 94 while an opposite second closed housing end 95 is provided with identical fluid port 96 including a check valve 97 with seal 97-a detailed before.
  • actuating rod 98 to that shown and described in FIG.1 by reference to actuating rod 18 including a metering valve 99 for control of flow between fluid chambers 100 and 101 interconnected by a side opening 102 in piston rod wall adjacent piston 103 to continue via central piston orifice 104 is spaced inside a hollow piston rod 91 to serve as an outside operable blocking device described.
  • Volume compensator 105 along bearing 106 adjacent housing end 92 includes a set of radially spaced elongated ribs 107 for support of piston rod 91 in service.
  • gas cylinder of F1G.5 is shown as an all plastic injection molded unit assembled from plastic molded parts, it is not limited to plastics in actual application due to reasons discussed in the preceding page.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Actuator (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

Dispositif de levage à vérin à gaz comprimé permettant un réglage de hauteur, comprenant un logement (92) tout en plastique, un ensemble de plongeur (90, 91) doté d'une tête ou piston (103), lequel (90, 91) est mobile de manière coulissante à l'intérieur d'un alésage cylindrique, le piston (103) disposé entre les chambres de fluide opposées (100, 101), une vanne de dosage (99) située à l'intérieur du piston (103), une vanne (97) de charge et de décharge du cylindre, ainsi qu'une tige (98) de commande extensible et rétractible permettant la sélection de différentes positions de l'ensemble de plongeur (90, 91).
PCT/US1987/002047 1987-08-20 1987-08-20 Dispositif de levage a verin a gaz comprime Ceased WO1989001578A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US1987/002047 WO1989001578A1 (fr) 1987-08-20 1987-08-20 Dispositif de levage a verin a gaz comprime

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1987/002047 WO1989001578A1 (fr) 1987-08-20 1987-08-20 Dispositif de levage a verin a gaz comprime

Publications (1)

Publication Number Publication Date
WO1989001578A1 true WO1989001578A1 (fr) 1989-02-23

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PCT/US1987/002047 Ceased WO1989001578A1 (fr) 1987-08-20 1987-08-20 Dispositif de levage a verin a gaz comprime

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0435834A1 (fr) * 1989-12-11 1991-07-03 Giuseppe Marini Dispositif de contrôle et de recharge pour les amortisseurs d'un vehicule utilisant du gaz à haute pression
CN112196636A (zh) * 2020-09-29 2021-01-08 中国航发动力股份有限公司 一种基于推紧顶具的发动机放气机构装配方法及推紧顶具

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3825244A (en) * 1971-12-28 1974-07-23 Suspa Federungstech Hydraulically lockable lifting device
US4108416A (en) * 1975-09-17 1978-08-22 Tokico Ltd Device for adjusting length of gas spring
US4257582A (en) * 1974-12-16 1981-03-24 Stabilus Gmbh Support column of adjustable length
US4650165A (en) * 1983-11-24 1987-03-17 Stabilus Gmbh Gas spring
US4662616A (en) * 1985-07-23 1987-05-05 Rantom, Inc. Combined check and exhaust valve for high pressure gas spring

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3825244A (en) * 1971-12-28 1974-07-23 Suspa Federungstech Hydraulically lockable lifting device
US4257582A (en) * 1974-12-16 1981-03-24 Stabilus Gmbh Support column of adjustable length
US4108416A (en) * 1975-09-17 1978-08-22 Tokico Ltd Device for adjusting length of gas spring
US4650165A (en) * 1983-11-24 1987-03-17 Stabilus Gmbh Gas spring
US4662616A (en) * 1985-07-23 1987-05-05 Rantom, Inc. Combined check and exhaust valve for high pressure gas spring

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0435834A1 (fr) * 1989-12-11 1991-07-03 Giuseppe Marini Dispositif de contrôle et de recharge pour les amortisseurs d'un vehicule utilisant du gaz à haute pression
CN112196636A (zh) * 2020-09-29 2021-01-08 中国航发动力股份有限公司 一种基于推紧顶具的发动机放气机构装配方法及推紧顶具
CN112196636B (zh) * 2020-09-29 2021-06-08 中国航发动力股份有限公司 一种基于推紧顶具的发动机放气机构装配方法及推紧顶具

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