WO1981003077A1 - Moyen de reglage des points extremes de la course du piston dans un cylindre de travail - Google Patents

Moyen de reglage des points extremes de la course du piston dans un cylindre de travail Download PDF

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Publication number
WO1981003077A1
WO1981003077A1 PCT/FI1981/000029 FI8100029W WO8103077A1 WO 1981003077 A1 WO1981003077 A1 WO 1981003077A1 FI 8100029 W FI8100029 W FI 8100029W WO 8103077 A1 WO8103077 A1 WO 8103077A1
Authority
WO
WIPO (PCT)
Prior art keywords
resistance
piston
movement
working cylinder
adjusting
Prior art date
Application number
PCT/FI1981/000029
Other languages
English (en)
Inventor
A Iivarinen
Original Assignee
A Iivarinen
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 A Iivarinen filed Critical A Iivarinen
Publication of WO1981003077A1 publication Critical patent/WO1981003077A1/fr
Priority to DK561181A priority Critical patent/DK561181A/da

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/16—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying resistance
    • G01D5/165—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying resistance by relative movement of a point of contact or actuation and a resistive track

Definitions

  • a moving member can be deter- mined by utilizing a principle coupling according to figure 1. It comprises a variable resistance R1 and two comparing members 1 and 2 which compare the resistance R1 with two set resistances R2 and R3 and give an indication when the value of the resistance R1 is the same as the value of the resistance R2 and the resistance R3, respectively.
  • a principle coupling according to figure 1.
  • the object of this invention is to provide a new means which, based on the above-mentioned principle, offers a simple means of adjusting the movement of the piston in a cylin- der.
  • the invention relates to a means for adjusting the extreme points of the movement of the piston in a working cylinder which comprises a variable resistance, and two comparing members for comparing the variable resistance with two set resistances.
  • variable resistance is arranged adjacent to the path of movement of the piston of the working cylinder and comprises a resis ⁇ tance element parallel to the path of movement and a strip of conductive, magnetic material which is located on the opposite side of the resistance element relative to the piston and has laterally projecting flexible transverse strips, and in that a part of the piston is formed as a magnet whereby, as the piston moves along the variable resistance, said transverse strips are, under the influen- ce of the magnet, successively bent into engagement with the resistance element and, accordingly, the value of the resistance is changed as the piston moves therelong.
  • figure 1 shows, as mentioned above, a general principle coupling to which the invention has been applied and figure 2 shows schematically one embodiment of a variable resistance used in the invention.
  • the comparing members 1 and 2 compare the value of a resistance R1 with set resistances R2 and R3.
  • the comparing member 1 gives an indication when the resistance R1 is equal to the resistance R2 and the comparing member 2, respectively, gives an indication when the resistance R1 is equal to the resistance R3.
  • These points have in the resistance R1 been designated a and b.
  • the above-mentioned principle is applied to adjusting the extreme points of the movement of the piston in a working cylinder in the following manner.
  • the resistance R1 is arranged adjacent to the path of movement of the piston parallel therewith.
  • a part of the piston or piston rod is magnetic, in the figure 2 this magnetic part is drawn very schematically and denoted with reference numeral 3.
  • the resistance R1 comprises a resistance element 4 and a strip 5 which is arranged close to it and provided with transverse strips or tongues 6.
  • the strip 5 and the tongues 6 are of electrically con ⁇ ductive magnetic materila and the strip 5 is connected to plus potential while the resistance element 4 is connected to earth.
  • the magnet 3 and the flexible tongues 6 are located on opposite sides of the resistance element 4, and when the magnet moves along the resistance element 4 and pulls a tongue 6 at each particular moment located at the magnet 3 in engagement with the resistance element 4 and, as the magnet has advanced, the tongue due to its elasticity again returns away from the resistance element.
  • the resistance to be measured from plus poten ⁇ tial to earth will change as the movement of the piston advances, and when the resistance is equal to R2 and R3, the comparing member 1 and 2, respectively, give a control signal to the control valve of the cylinder in a manner known per se.
  • the tongues 6 can be considerably more closely spaced and an indivi ⁇ dual tongue can be narrower so that several tongues, at a time, will be bent into engagement with the resistance element 4, whereby a precise adjustment is obtained.
  • the resistance element 4 can be a conventional wire resistance which preferably is shaped flat so that the magnet 3 will be able to act on the tongues 6 from a close distance.
  • the resistance element 4 can also be a continuous rod or strip made of a suitable material, in which case the resistance of the material must be so high that it changes as the point of contact between it and the tongues 6 is moving along the resistance element.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Actuator (AREA)
  • Adjustable Resistors (AREA)

Abstract

Moyen de reglage des points extremes de la course du piston dans un cylindre de travail. Le moyen comprend une resistance variable (R1), deux resistances fixes et deux organes de comparaison qui comparent la resistance variable avec les resistances fixes et envoient un signal de commande a la soupape de commande du cylindre de travail lorsque la valeur de la resistance variable (R1) atteint la meme valeur que celle de l'une des deux resistances fixes. La resistance variable (R1) est disposee adjacente au chemin de la course du piston dans le cylindre de travail et comprend un element de resistance (4) et une bande de materiau magnetique (5) situee sur le cote oppose de l'element de resistance (4) par rapport au piston et possedant des bandes transversales flexibles (6) en saillie laterale. Une partie (3) du piston est formee comme un aimant et, lorsque le piston se deplace le long de la resistance de reglage, les bandes transversales (6) sont courbees successivement pour s'engager avec l'element de resistance (4) et, de ce fait, la valeur de la resistance varie en fonction du deplacement du piston le long de celle-ci.
PCT/FI1981/000029 1980-04-18 1981-04-16 Moyen de reglage des points extremes de la course du piston dans un cylindre de travail WO1981003077A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DK561181A DK561181A (da) 1980-04-18 1981-12-17 Organ til indstilling af yderpunkterne ved bevaegelsen af stemplet i en arbejdscylinder

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI801239A FI59177C (fi) 1980-04-18 1980-04-18 Anordning foer reglering av aendpunkterna foer roerelsen av en arbetscylinders kolv
FI801239 1980-04-18

Publications (1)

Publication Number Publication Date
WO1981003077A1 true WO1981003077A1 (fr) 1981-10-29

Family

ID=8513422

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1981/000029 WO1981003077A1 (fr) 1980-04-18 1981-04-16 Moyen de reglage des points extremes de la course du piston dans un cylindre de travail

Country Status (3)

Country Link
EP (1) EP0049291A1 (fr)
FI (1) FI59177C (fr)
WO (1) WO1981003077A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU581229B2 (en) * 1984-09-10 1989-02-16 International Control Automation Finance Sa Position transmitter for a pneumatic-pneumatic or electro pneumatic converter
FR2634579A1 (fr) * 1988-07-25 1990-01-26 Mcb Potentiometre commandable par une contrainte mecanique reduite
EP0353127A1 (fr) * 1988-07-25 1990-01-31 M C B Potentiomètre commandable par une contrainte mécanique réduite
WO1998031991A1 (fr) * 1997-01-16 1998-07-23 Mannesmann Vdo Ag Indicateur de niveau
EP1965176A1 (fr) 2007-03-01 2008-09-03 J. Wagner AG Capteur destiné à détecter la position d'un objet magnétique mobile et un dispositif d'acheminement muni du capteur

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1610591A (en) * 1924-04-18 1926-12-14 Mark H Redman Liquid-level indicator
US1681268A (en) * 1925-02-07 1928-08-21 Auto Meter Co Inc Float-operated rheostat
US2484690A (en) * 1947-07-24 1949-10-11 Liquidometer Corp Electric liquid level indicating device
US3663881A (en) * 1969-12-12 1972-05-16 Metritape Continuous position sensing system
DE2604894A1 (de) * 1975-02-28 1976-09-09 Kuebler Impulsgeraete Messwertgeber fuer einen wegfuehler
GB1496912A (en) * 1974-07-24 1978-01-05 Gehring Gmbh Maschf Honing machine with analogue control apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1610591A (en) * 1924-04-18 1926-12-14 Mark H Redman Liquid-level indicator
US1681268A (en) * 1925-02-07 1928-08-21 Auto Meter Co Inc Float-operated rheostat
US2484690A (en) * 1947-07-24 1949-10-11 Liquidometer Corp Electric liquid level indicating device
US3663881A (en) * 1969-12-12 1972-05-16 Metritape Continuous position sensing system
GB1496912A (en) * 1974-07-24 1978-01-05 Gehring Gmbh Maschf Honing machine with analogue control apparatus
DE2604894A1 (de) * 1975-02-28 1976-09-09 Kuebler Impulsgeraete Messwertgeber fuer einen wegfuehler

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU581229B2 (en) * 1984-09-10 1989-02-16 International Control Automation Finance Sa Position transmitter for a pneumatic-pneumatic or electro pneumatic converter
FR2634579A1 (fr) * 1988-07-25 1990-01-26 Mcb Potentiometre commandable par une contrainte mecanique reduite
EP0353127A1 (fr) * 1988-07-25 1990-01-31 M C B Potentiomètre commandable par une contrainte mécanique réduite
WO1998031991A1 (fr) * 1997-01-16 1998-07-23 Mannesmann Vdo Ag Indicateur de niveau
EP1965176A1 (fr) 2007-03-01 2008-09-03 J. Wagner AG Capteur destiné à détecter la position d'un objet magnétique mobile et un dispositif d'acheminement muni du capteur
EP1965176B1 (fr) * 2007-03-01 2014-07-30 J. Wagner AG Capteur destiné à détecter la position d'un objet magnétique mobile et un dispositif d'acheminement muni du capteur

Also Published As

Publication number Publication date
FI59177B (fi) 1981-02-27
FI59177C (fi) 1981-06-10
EP0049291A1 (fr) 1982-04-14

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