US3919509A - Electrically conductive pneumatic spring with door actuated switch means - Google Patents

Electrically conductive pneumatic spring with door actuated switch means Download PDF

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Publication number
US3919509A
US3919509A US482645A US48264574A US3919509A US 3919509 A US3919509 A US 3919509A US 482645 A US482645 A US 482645A US 48264574 A US48264574 A US 48264574A US 3919509 A US3919509 A US 3919509A
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United States
Prior art keywords
cavity
pneumatic spring
set forth
piston
terminals
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.)
Expired - Lifetime
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US482645A
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English (en)
Inventor
Klaus Schnitzius
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Stabilus GmbH
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Stabilus GmbH
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R35/00—Flexible or turnable line connectors, i.e. the rotation angle being limited
    • H01R35/02—Flexible line connectors without frictional contact members
    • 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
    • F16F9/0281—Details
    • F16F9/029—Details electrical, e.g. connections or contacts

Definitions

  • ABSTRACT CL 200/82 The pneumatic spring which holds the rear gate of a station wagon in the open position transmits electric current to heating filaments in the window of the rear gate by way of terminals on the piston rod and the cylinder of the spring. the terminals being connected by a contact spring in the cylinder cavity in the closed position of the rear gate.
  • the other conductive connection being normally pro-- vided by the metallic vehicle body.
  • Pneumatic springs have been used for balancing a portion of the weight of an open rear gate, and it has now been found that such pneumatic springs may readily be modified for reliably transmitting even heavy electriccurrent to, the rear gate of a station wagon withoutsignificantly increasing the cost of the pneumatic spring.
  • the pneumaticspring according to this invention has a cylinder member and apiston assembly movable in the direction of thecylinder axis between two end positions, the assembly including a piston in sliding contact with the cylinder member in the cavity of the latter and a piston rod member-fixedly fastened to the piston and axiallyprojecting-from the cylinder member in sealing engagement with the same.
  • a gas under pressure higher than atmospheric pressure is enclosed in the cavity and impedes axial movement of the piston assembly.
  • Means are provided on respective, oppositely spaced, axially terminal portions of the cylinder member and the piston rod memberoutside the cylinder cavity for fastening the two members to respective objects.
  • the structure defined so far is conventional.
  • electrically conductive terminals are mounted on the cylinder member and on the piston rod'member outsidethe cavity, and an electrical conductor in the cavity connects the two terminals in one of the end positions of the piston assembly.
  • FIG. -1 shows a pneumatic spring of the invention in elevation
  • FIG. 2 illustrates the spring of FIG. 1 in axial section
  • FIG. 3 shows a station wagon equipped with the spring illustrated in FIGS. 1 and 2 in fragmentary, side elevational section; and I FIG. 4 is a fragmentary view of axial section.
  • FIG. 1 there is seen a pneumatic spring havingan axially elongated ,cylinder .1 from which a piston rod 2axially projects.
  • a conventional mannenA coating or tube 10 of electrically insulating material such as polyvinyl chloride, covers the entire exposed surface of the cylinder which is visible in FIG. 1.
  • a similar coating or tube 16 covers the portion of the pistonrod-2 axially adjacent the eye 5.
  • the coating' or tube 16 covers all-.exposed surfaces of the piston rod-2.
  • Lugs 7, 8 project radially from the eyes;5, ,6 where. they join the piston rod 2 and the cylinder.
  • the eyes 5,6 consist of plastic reinforced with glass fibers.
  • An axial bore in the. eye Sis matingly engaged by threads 22 on the metallic piston rod 2, and the. piston rod has a conical shoulder 23 adjacent the threads 22.
  • the lug 7 is an integral part of a sheet metal washer 12 formed with an opening 20 and having a conical, raised rim 21 about the opening. The piston rod 2 passes through the opening, and the rim 21 is firmly clamped between the shoulder 23 and a radial end face ofthe eye 5.
  • the piston rod 2 axially enters the cavity of the cylinder 1 through an apertured, transverse end wall 4, and is movably sealed to the endwall by a sealing ring 25.
  • the ring 25 is axially secured by a tubular spacer 14 held in its position by a washer 27 which axially abuts against an integral circumferential rib 26 on the inner wall of the cylinder-.1.
  • a sealing ring 15 retained by the a modified spring in washer 27 seals the piston rod 2 to the portion of the spacer l4 remote from the sealing ring 25.
  • the sealed annular chamber 28 radially bounded by the rod 2 and the spacer 14, and axially bounded by the sealingrings 15, 25 is filledwith oil.
  • the axial portion 29 of the cylinder cavity between the washer 27 and the other, normally sealed, transverse end wall 9 is filled with nitrogen under a pressure much higher than atmospheric pressure.
  • the reduced end portion of the piston rod 2 in the cylinder cavity is received in the central bore of a fixedly fastened piston 3 carrying a piston ring 30 which provides sliding contact of the piston with the inner cylinder wall.
  • a bore 31 in the end portion of the rod 2 connects the compartments of the cylinder cavity otherwise sealed from each other-by the piston 3 and has a throttling portion 32 of reduced flow section.
  • the wide end of the spring 11 resiliently engages the inner cylinder wall and is further axially secured by a rib 26' on the cylinder similar to the rib 26.
  • the rib 26 also prevents movement of the end wall 9 axially inward of the cylinder 1 under the resilient pressure exerted by the contiguously adjacent base of the eye 6 which is retained between the end wall 9 and an internal flange of the cylinder 1.
  • a ball 17 in the end wall 9 is pressed into a bore through which the pressure medium has been filled into cylinder 1.
  • the lug 8 is the exposed end of a metal strip 13 clamped between the eye 6 and the metallic end wall 9 and partly received in a groove 24 of the eye 6.
  • a continuous conductive path capable of carrying relatively heavy current is provided between the lugs 7, 8 by the end wall 9, the cylinder 1, the spring 11, the piston 3, and the piston rod 2.
  • Secondary, less reliable circuits lead from the cylinder l'to the piston 3 through the piston ring 30, and from the cylinder 1 to the piston rod 2 through the end wall 4.
  • These secondary circuits provide the only conductive connection between the lugs 7, 8 when the piston assembly moves into its other end position in which the piston 3 is nearer the washer 27-than isshown in FIG. 2 while the spring 11 is held in the illustrated position by frictional engagement of its wider end with the cylinder 1 and is separated from the piston 3 by a gas-filled gap. This is not normally undesirable in the application of the pneumatic spring shown in FIG. 3.
  • FIG. 3 shows only as much of an otherwise conventional station wagon as is relevant to this invention.
  • the body 33 of the vehicle carries a pin 34 which is pivotally received in the eye 6 on the cylinder 1 of the spring shown in FIGS. 1 and 2.
  • Another pin 35 on the rear gate 36 of the wagon is received in the eye of the spring.
  • the window 37 in the rear gate 36 has a fused-in grid of resistance wires drawing current from an insulated supply wire 38 whose illustrated free end carries a clip 39 attached to the lug 8, the other end being connected to one pole of the storage battery 50 and the non-illustrated generator of the wagon in a conventional manner not entirely shown.
  • a clip 40 on one lead of the grid is attached to the lug 7.
  • the grid itself is not capable of pictorial representation on the scale of FIG. 3.
  • the window 37 needs to be heated only when the gate 36 is in the illustrated closed position, and the eyes 5, 6 are closest to each other.
  • the spring 11 provides a circuit of low resistance in this condition, the lugs 7, 8
  • FIG. 4 shows a modification of the pneumatic spring described above which automatically switches off the heating current to the window 37 when the gate 36 is lifted.
  • the modified spring is identical with that seen in FIGS. 1 to 3, and it is installed in the station wagon in the same manner.
  • the modified spring has a cup-shaped receptacle 18 of insulating plastic whose radial end wall axially abuts against the rib 26' of the cylinder 1 and is apertured to admit gas to the cylinder cavity 29.
  • the cylindrical wall of the receptacle 18 conformingly engages the inner cylinder wall and insulates the wider end of the spring 11 from the cylinder.
  • a plastic plug 19 seals a radial bore in the cylinder 1 near the rib 26' and is fixedly fastened to the insulating coating 10 on the outside of the cylinder 1 and to the receptacle 18.
  • the terminal function of the lug 8 is assumed in the modified pneumatic spring by a lug 8' which passes through the plug 19 and is soldered to the wide end of the contact spring 11 in the receptacle 18.
  • the contact spring 11 provides the only conductive connection between the terminals 7, 8' in the cylinder cavity, and this connection is interrupted when the piston 3 is lifted from the narrow end of the spring 11 while the pneumatic spring expands, as during opening of the gate 36 when the modified spring is installed in the'station wagon in the manner shown in FIG. 3.
  • Plastic fastening eyes 5, 6 have sufficient strength for holding a station wagon gate, but may be replaced by plastic-coated metal eyes, if so desired.
  • the necessary electrical insulation of the current-carrying elements of the pneumatic spring from the current-return path in the vehicle body may be brought about in many other obvious ways as by insulating the pins 34, 35 or by placing insulating, tubular liners in the openings of the eyes 5, 6.
  • a pneumatic spring comprising:
  • a piston assembly axially movable relative to said cylinder member between two end postions, said assembly including (1) a piston axially separating two compartments in said cavity, and
  • said conductive means include a resilient contact element in said cavity conductively connected to the one of said terminals mounted on said cylinder member, electrically insulating mounting means securing said contact element and said one terminal to said cylinder member, said piston assembly having an electrically conductive face engaging said contact element in said one end position of the piston assembly while being separated from said contact element by said gas in said other end position of said piston assembly, said contact element and piston assembly jointly constituting said switch means.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Damping Devices (AREA)
  • Closing And Opening Devices For Wings, And Checks For Wings (AREA)
  • Chairs Characterized By Structure (AREA)
  • Springs (AREA)
  • Actuator (AREA)
  • Air Bags (AREA)
  • Superstructure Of Vehicle (AREA)
US482645A 1973-06-28 1974-06-24 Electrically conductive pneumatic spring with door actuated switch means Expired - Lifetime US3919509A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2332791A DE2332791C3 (de) 1973-06-28 1973-06-28 Gasfeder

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US05/848,346 Reissue USRE30663E (en) 1973-06-28 1977-11-03 Electrically conductive pneumatic spring with door actuated switch means

Publications (1)

Publication Number Publication Date
US3919509A true US3919509A (en) 1975-11-11

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US482645A Expired - Lifetime US3919509A (en) 1973-06-28 1974-06-24 Electrically conductive pneumatic spring with door actuated switch means
US05/848,346 Expired - Lifetime USRE30663E (en) 1973-06-28 1977-11-03 Electrically conductive pneumatic spring with door actuated switch means

Family Applications After (1)

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US05/848,346 Expired - Lifetime USRE30663E (en) 1973-06-28 1977-11-03 Electrically conductive pneumatic spring with door actuated switch means

Country Status (7)

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US (2) US3919509A (fr)
JP (1) JPS5712895B2 (fr)
CH (1) CH572171A5 (fr)
DE (2) DE7323902U (fr)
FR (1) FR2235311B1 (fr)
GB (1) GB1471387A (fr)
IT (1) IT1014397B (fr)

Cited By (35)

* Cited by examiner, † Cited by third party
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US4118131A (en) * 1975-04-12 1978-10-03 Stabilus Gmbh Pneumatic spring
FR2410349A1 (fr) * 1977-11-26 1979-06-22 Stabilus Gmbh Ressort a gaz formant interrupteur de courant
US4163970A (en) * 1975-05-23 1979-08-07 Allinquant F M Pneumatic springs and other telescopic systems
US4181833A (en) * 1978-06-07 1980-01-01 General Motors Corporation Closure electrical contact assembly
US4221367A (en) * 1978-10-23 1980-09-09 Gas Spring Corporation Gas spring with two-stage damping
US4263488A (en) * 1977-01-27 1981-04-21 Stabilus Gmbh Pneumatic spring including an electric switch
US4268018A (en) * 1977-08-06 1981-05-19 Stabilus Gmbh Electrically conductive, telescoping spring
USRE30663E (en) * 1973-06-28 1981-06-30 Stabilus Gmbh Electrically conductive pneumatic spring with door actuated switch means
US4281884A (en) * 1976-04-07 1981-08-04 Stabilus Gmbh Electrically conductive pneumatic spring
US4298194A (en) * 1980-04-07 1981-11-03 Atwood Vacuum Machine Company Gas spring with improved terminal connector and mounting means
US4316098A (en) * 1977-10-28 1982-02-16 Stabilus Gmbh Gas spring arrangement operating as an electrical connection
US4317014A (en) * 1979-04-28 1982-02-23 Stabilus Gmbh Gas spring
US4323224A (en) * 1976-04-30 1982-04-06 Stabilus Gmbh Gas spring with means for impeding piston movement away from one terminal position
US4548389A (en) * 1983-03-01 1985-10-22 Fichtel & Sachs Industries, Inc. Redundant high-pressure seal for fluid spring
US4630360A (en) * 1985-04-15 1986-12-23 Robert Shaw Controls Company Method of making differential pressure operated electrical switch
EP0259010A2 (fr) * 1986-09-02 1988-03-09 General Motors Corporation Procédé de fabrication d'un ensemble modulaire de piston et tige de piston
US4910366A (en) * 1987-07-21 1990-03-20 Mitsubishi Denki Kabushiki Kaisha Engine idle position detecting switch
US5011121A (en) * 1987-04-15 1991-04-30 Eagle-Picher Industries, Inc. Seal for gas spring
US5043542A (en) * 1990-09-17 1991-08-27 Suspa Incorporated Self-adjusting electric switch and gas cylinder
EP0836033A2 (fr) * 1996-10-11 1998-04-15 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Support pour une unité motrice vibratoire
US5791445A (en) * 1997-05-26 1998-08-11 Fichtel & Sachs Industries, Inc. Piston rod-cylinder assembly with shrink-wrap corrosion protective sleeve
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US20060001202A1 (en) * 2004-07-01 2006-01-05 Bauman Walter D Gas spring with integrated lead screw drive
US20060207057A1 (en) * 2005-03-15 2006-09-21 Agostino Ferrari S.P.A Damping device for pieces of furniture with improved compensation system of volume variations
US20070187195A1 (en) * 2006-02-16 2007-08-16 Woo Chul Park Glove box lamp switch
US20080116903A1 (en) * 2004-02-25 2008-05-22 Richard Koerber Microwave Sensor For High-Precision Level Measurement In A Pneumatic Spring
WO2008139213A1 (fr) * 2007-05-14 2008-11-20 Airbus Uk Limited Connecteur électrique
US7600617B1 (en) * 2005-03-28 2009-10-13 General Manufacturing Systems, Inc. Industrial shock absorber for use in a conveyor system
US20140238967A1 (en) * 2013-02-26 2014-08-28 Spartan Motors, Inc. Heated moveable glass for vehicles
EP2780988A4 (fr) * 2011-11-18 2015-09-02 Saab Ab Procédé et dispositif pour transférer de l'énergie électrique et/ou des signaux de données
WO2016009276A1 (fr) * 2014-07-18 2016-01-21 1721012 Alberta Ltd. Système d'atténuation des chocs anti-fatigue
US10276318B1 (en) 2013-03-15 2019-04-30 Innovative Switchgear IP, LLC Insulated switch
US20190203797A1 (en) * 2016-09-21 2019-07-04 Kyb Corporation Cylinder device
US20220063684A1 (en) * 2018-12-14 2022-03-03 Dellner Couplers Ab Piston rod end for a linear actuator, piston assembly and sealing method for a piston rod end

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DE2366253C2 (fr) * 1973-06-28 1989-02-23 Stabilus Gmbh, 5400 Koblenz, De
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JPS54111006U (fr) * 1978-01-23 1979-08-04
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JPS5896148U (ja) * 1981-12-23 1983-06-30 アイシン精機株式会社 ガス封入型オイルシリンダのストロ−ク制限装置
EP0129896B1 (fr) * 1983-06-28 1988-03-30 EMIL WEBER FABRIK FÜR ÖLHYDRAULIK GMBH & CO. Dispositif de support de cabines sur véhicules utilitaires
US5003136A (en) * 1989-12-18 1991-03-26 Judco Manufacturing, Inc. Gas strut switch assembly
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US8402695B2 (en) * 2009-08-06 2013-03-26 Magna Mirrors Of America, Inc. Heated rear slider window assembly
EP2616259B1 (fr) 2010-09-15 2019-04-10 Magna Mirrors Of America, Inc. Ensemble fenêtre à curseur
US8938914B2 (en) 2010-10-01 2015-01-27 Magna Mirrors Of America, Inc. Slider window assembly with cable guides
MX2013007346A (es) 2010-12-22 2014-03-12 Magna Mirrors Of America Inc Ensamble de ventana corrediza.
US9475364B2 (en) 2013-10-14 2016-10-25 Magna Mirrors Of America, Inc. Sealing system for movable window of rear window assembly
US9579955B2 (en) 2014-08-26 2017-02-28 Magna Mirros Of America, Inc. Rear slider window assembly with heated movable window
US9731580B2 (en) 2014-10-29 2017-08-15 Magna Mirrors Of America, Inc. Slider window assembly with sensor
US10266037B2 (en) 2015-11-23 2019-04-23 Magna Mirrors Of America, Inc. Slider window assembly with two piece end stop
US10239397B2 (en) 2015-11-24 2019-03-26 Magna Mirrors Of America, Inc. Sealing system for movable window of rear window assembly
CN106809285A (zh) * 2016-12-16 2017-06-09 无锡市盛源汽车配件厂 具备加热功能的汽车液压支撑杆
US10524313B2 (en) 2017-02-09 2019-12-31 Magna Mirrors Of America, Inc. Rear slider window assembly with laminated heating element
DE102017217293A1 (de) * 2017-09-28 2019-03-28 Bayerische Motoren Werke Aktiengesellschaft Gasdruckfederbaugruppe sowie Kraftfahrzeugklappenbaugruppe mit einer Gasdruckfederbaugruppe
US11938793B2 (en) 2019-03-14 2024-03-26 Magna Mirrors Of America, Inc. Sealing system for movable window of vehicular rear window assembly
US11912110B2 (en) 2020-06-05 2024-02-27 Magna Mirrors Of America, Inc. Sealing system for movable window of vehicular rear slider window assembly
US11686144B2 (en) 2021-02-24 2023-06-27 Magna Mirrors Of America, Inc. Slider window assembly with switch device

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Cited By (53)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE30663E (en) * 1973-06-28 1981-06-30 Stabilus Gmbh Electrically conductive pneumatic spring with door actuated switch means
US4118131A (en) * 1975-04-12 1978-10-03 Stabilus Gmbh Pneumatic spring
US4163970A (en) * 1975-05-23 1979-08-07 Allinquant F M Pneumatic springs and other telescopic systems
US4281884A (en) * 1976-04-07 1981-08-04 Stabilus Gmbh Electrically conductive pneumatic spring
US4323224A (en) * 1976-04-30 1982-04-06 Stabilus Gmbh Gas spring with means for impeding piston movement away from one terminal position
US4263488A (en) * 1977-01-27 1981-04-21 Stabilus Gmbh Pneumatic spring including an electric switch
US4268018A (en) * 1977-08-06 1981-05-19 Stabilus Gmbh Electrically conductive, telescoping spring
US4400600A (en) * 1977-10-28 1983-08-23 Stabilus Gmbh Gas spring arrangement operating as an electrical connection
US4316098A (en) * 1977-10-28 1982-02-16 Stabilus Gmbh Gas spring arrangement operating as an electrical connection
US4237353A (en) * 1977-11-26 1980-12-02 Stabilus Gmbh Telescopic spring operable as an electric switch
FR2410349A1 (fr) * 1977-11-26 1979-06-22 Stabilus Gmbh Ressort a gaz formant interrupteur de courant
US4181833A (en) * 1978-06-07 1980-01-01 General Motors Corporation Closure electrical contact assembly
US4221367A (en) * 1978-10-23 1980-09-09 Gas Spring Corporation Gas spring with two-stage damping
US4317014A (en) * 1979-04-28 1982-02-23 Stabilus Gmbh Gas spring
US4298194A (en) * 1980-04-07 1981-11-03 Atwood Vacuum Machine Company Gas spring with improved terminal connector and mounting means
US4548389A (en) * 1983-03-01 1985-10-22 Fichtel & Sachs Industries, Inc. Redundant high-pressure seal for fluid spring
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Also Published As

Publication number Publication date
DE2332791B2 (de) 1979-09-20
DE2332791C3 (de) 1984-09-13
GB1471387A (en) 1977-04-27
JPS5036879A (fr) 1975-04-07
JPS5712895B2 (fr) 1982-03-13
IT1014397B (it) 1977-04-20
CH572171A5 (fr) 1976-01-30
USRE30663E (en) 1981-06-30
FR2235311A1 (fr) 1975-01-24
DE2332791A1 (de) 1975-01-16
DE7323902U (de) 1977-02-24
FR2235311B1 (fr) 1978-10-27

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