US3738632A - Weight-balancing arrangement at vertically displaceable instrument tables for ophthalmological apparatus or the like - Google Patents

Weight-balancing arrangement at vertically displaceable instrument tables for ophthalmological apparatus or the like Download PDF

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Publication number
US3738632A
US3738632A US00121365A US3738632DA US3738632A US 3738632 A US3738632 A US 3738632A US 00121365 A US00121365 A US 00121365A US 3738632D A US3738632D A US 3738632DA US 3738632 A US3738632 A US 3738632A
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US
United States
Prior art keywords
spring
arrangement according
rope
housing
converting
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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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US00121365A
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English (en)
Inventor
F Mayerhofer
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.)
Optische Werke G Rodenstock
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Optische Werke G Rodenstock
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Publication date
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    • G—PHYSICS
    • G12—INSTRUMENT DETAILS
    • G12B—CONSTRUCTIONAL DETAILS OF INSTRUMENTS, OR COMPARABLE DETAILS OF OTHER APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G12B5/00—Adjusting position or attitude, e.g. level, of instruments or other apparatus, or of parts thereof; Compensating for the effects of tilting or acceleration, e.g. for optical apparatus

Definitions

  • ABSTRACT A weight-balancing arrangement on essentially vertically displaceable instrument tables for ophthalmological apparatus or the like which includes a pull rope connected with a spring and engaging at the apparatus support approximately in the centroidal axis thereof to counteract the weight; the drawing direction of the spring extends in an approximately horizontal plane while the rope is connected at one end with a downward extension of the apparatus support and over a section thereof is guided by way of reversing rollers in the direction of movement of the apparatus support.
  • the present invention relates to a weight-balancing arrangement at essentially vertically displaceable instrument tables for ophthalmological apparatus or the like, with a pull rope connected with a spring and engaging at the instrument support approximately in the axis of gravity thereof.
  • the weight-balancing arrangement should possess slight dimensions in the vertical direction and should not require more space in the vertical direction than corresponds to the adjusting path of the instrument table. Additionally, the influence of the friction at the guide elements of the instrument table should be limited far-reachingly.
  • the underlying problems are solved according to the present invention in that the draw direction of the spring extends in an approximately horizontal plane and, in that a downwardly directed extension is arranged at the instrument support within the area of its axis of gravity, with the free end of which is connected the pull rope guided over a section thereof in the direction of movement of the apparatus support with the aid of reversing rollers.
  • a spiral spring may be provided as draw spring, whose movable end is connected by way of a rotating shaft with a drum, on which is wound an end section of the pull rope.
  • a conventional arrangement may be provided between the spring and the pull rope which converts the spring force variable as a function of the path into a constant draw force of the rope.
  • a rope disk with an eccentric abutment or engaging surface for the pull rope may be utilized for that purpose. The abutment surface is then to be so dimensioned that the radius thereof effective at the pull rope increases with the effective spring force.
  • the prestress of the spring may be adjustable.
  • this spring may be arranged in a cylindrical spring housing and may be connected to the spring housing with one end thereof. This spring housing may then be constructed rotatable about its axis and lockable.
  • Another object of the present invention resides in a weight-balancing arrangement for vertically displaceable instrument tables, for example, for ophthalmological apparatus, which permits a relatively compact construction minimizing friction losses and assuring an extraordinary flat spring characteristic.
  • a further object of the present invention resides in a weight-balancing arrangement of the type described above which insures a far-reaching weight equalization over the entire adjusting path of the instrument table without increasing the dimensions of the installation or of the overall construction of the instrument table.
  • Still another object of the present invention resides in a weight-balancing arrangement for instrument ta-, bles which not only achieves all of the aforementioned aims and objects in a completely satisfactory manner, but also permits adjustment of the weight-balancing ar rangement to compensate for the attachment of instruments of different weight.
  • FIGURE is a somewhat schematic crosssectional view through a weight-balancing arrangement of an instrument table for ophthalmological apparatus or the like in accordance with the present invention.
  • the apparatus support 1, 3, 4 is displaceably guided on a vertical guide column 5 with the aid of a guide bush 2.
  • the guide column 5 isfixedly arranged in a base plate 6.
  • a vertically downwardly directed extension 7 is arranged at the lower cantilever arm 1 of the apparatus support; the pull rope 9 is secured at the free end 8 of the extension 7.
  • the pull rope 9 is guided within the area of the extension 7 in the direction of movement of the apparatus support 1, 3, 4 with the aid of the reversing roller 10. From the reversing roller 10, the pull rope 9 leads by way of a further reversing roller 11 onto an eccentric rope drum 12 which is connected by way of the rotating shaft 13 with the inner end of a spiral spring 14.
  • the outer end of the spiral spring 14 is connected with the cylindrical spring housing 15.
  • the spring housing 15 is rotatable and adjustable by conventional means about the axis 13.
  • the spindle arrangement 16 of conventional construction serves in the usual manner for the fine height adjustment of the apparatus. Since the spindle arrangement 16 is known as such, a detailed description thereof is dispensed with herein.
  • the horizontally arranged spiral spring 14 occupies only a slight amount of space in the vertical direction which does not influence the remaining constructive design and configuration of the apparatus support. Possibly the spring arrangement may also be arranged on the inside of the base plate 6.
  • the use of, for example, a spirally shaped rope drum 12 in conjunction with a spring housing 15 adjustable in the circumferential direction permits a sensitive matching with a very finefeel of the constant lifting force of the balancing arrangement to the prevailing weight of the apparatus support in connection with different apparatus attachments.
  • An arrangement according to claim 8 characterized by means for adjusting the prestress of said spring by rotating said spring housing to a predetermined initial prestress position and locking said housing in said position.
  • spiral spring is arranged in a spring housing and is connected with one end thereof with said housing, and in that said spring housing is adjustable about its axis of rotation.

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  • Springs (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)
US00121365A 1970-03-05 1971-03-05 Weight-balancing arrangement at vertically displaceable instrument tables for ophthalmological apparatus or the like Expired - Lifetime US3738632A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702010386 DE2010386A1 (de) 1970-03-05 1970-03-05 Gewichtsausgleichsanordnung an senkrecht verschiebbaren Instrumententischen für ophthalmologische Geräte oder dergl

Publications (1)

Publication Number Publication Date
US3738632A true US3738632A (en) 1973-06-12

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ID=5764175

Family Applications (1)

Application Number Title Priority Date Filing Date
US00121365A Expired - Lifetime US3738632A (en) 1970-03-05 1971-03-05 Weight-balancing arrangement at vertically displaceable instrument tables for ophthalmological apparatus or the like

Country Status (5)

Country Link
US (1) US3738632A (enExample)
CH (1) CH513491A (enExample)
DE (1) DE2010386A1 (enExample)
FR (1) FR2078632A5 (enExample)
GB (1) GB1335863A (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060130714A1 (en) * 2004-12-17 2006-06-22 Steelcase Development Corporation Load compensator for height adjustable table

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3160250A (en) * 1962-11-15 1964-12-08 Safety Engineering Co Fire-operated safety devices

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3160250A (en) * 1962-11-15 1964-12-08 Safety Engineering Co Fire-operated safety devices

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IBM Technical Disclosure Bulletin Vol. 2 No. 1 June/1959 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060130714A1 (en) * 2004-12-17 2006-06-22 Steelcase Development Corporation Load compensator for height adjustable table
US7658359B2 (en) 2004-12-17 2010-02-09 Steelcase Development Corporation Load compensator for height adjustable table
US9591920B2 (en) 2004-12-17 2017-03-14 Steelcase Inc. Load compensator for height adjustable table
US9826825B1 (en) 2004-12-17 2017-11-28 Steelcase Inc. Load compensator for height adjustable table
US9913532B1 (en) 2004-12-17 2018-03-13 Steelcase Inc. Load compensator for height adjustable table
US10051955B1 (en) 2004-12-17 2018-08-21 Steelcase Inc. Load compensator for height adjustable table
US10420417B1 (en) 2004-12-17 2019-09-24 Steelcase Inc. Load compensator for height adjustable table

Also Published As

Publication number Publication date
FR2078632A5 (enExample) 1971-11-05
GB1335863A (en) 1973-10-31
CH513491A (de) 1971-09-30
DE2010386A1 (de) 1971-09-16

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