GB997620A - Improvements in adjustable blackboards - Google Patents

Improvements in adjustable blackboards

Info

Publication number
GB997620A
GB997620A GB4678863A GB4678863A GB997620A GB 997620 A GB997620 A GB 997620A GB 4678863 A GB4678863 A GB 4678863A GB 4678863 A GB4678863 A GB 4678863A GB 997620 A GB997620 A GB 997620A
Authority
GB
United Kingdom
Prior art keywords
pulleys
cord
attached
board
blackboards
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
Application number
GB4678863A
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 GB4678863A priority Critical patent/GB997620A/en
Publication of GB997620A publication Critical patent/GB997620A/en
Expired legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B97/00—Furniture or accessories for furniture, not provided for in other groups of this subclass
    • A47B97/04—Easels or stands for blackboards or the like
    • A47B97/06—Easels or stands for blackboards or the like with means for balancing weight of blackboards or the like, e.g. connected to wall

Landscapes

  • Drawing Aids And Blackboards (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Abstract

997,620. Blackboards; balancing arrangements. F. BONG. Nov. 27, 1963, No. 46783/63. Heading B6P. [Also in Division B8] A counterbalancing system for supporting a vertically sliding blackboard 1, Fig. 1, comprises bearing cords 8, 9 attached to a pulley 6, yieldingly held against rotation by a spring unit 23 acting through a cord 18 which wraps over a cam 7 operating to change the effective radius and maintain a substantially constant lifting force on the board. In the example of Fig. 1, the cord 9 passes over a freely-rotating pulley 10, both pulleys being attached to a fixed part of the frame. In modifications, both pulleys may carry spring-loaded cams 6 and are interconnected by a crossed cord to synchronize the movements on opposite sides. In a further example the pulleys and springs may be mounted on the back of the board and the cords attached to fixed parts of the framework.
GB4678863A 1963-11-27 1963-11-27 Improvements in adjustable blackboards Expired GB997620A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4678863A GB997620A (en) 1963-11-27 1963-11-27 Improvements in adjustable blackboards

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4678863A GB997620A (en) 1963-11-27 1963-11-27 Improvements in adjustable blackboards

Publications (1)

Publication Number Publication Date
GB997620A true GB997620A (en) 1965-07-07

Family

ID=10442600

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4678863A Expired GB997620A (en) 1963-11-27 1963-11-27 Improvements in adjustable blackboards

Country Status (1)

Country Link
GB (1) GB997620A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2435191A1 (en) * 1978-09-05 1980-04-04 Sperry Rand Ltd AGRICULTURAL HARVESTING MACHINES EQUIPPED WITH CROP HARVESTER MECHANISMS
GB2340103A (en) * 1998-07-29 2000-02-16 Cartoni S P A Counterbalance structure for cameras moving out of the vertical plane
NL2001125C2 (en) * 2007-12-21 2009-06-23 Univ Delft Tech Device for exerting a force on a load.

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2435191A1 (en) * 1978-09-05 1980-04-04 Sperry Rand Ltd AGRICULTURAL HARVESTING MACHINES EQUIPPED WITH CROP HARVESTER MECHANISMS
GB2340103A (en) * 1998-07-29 2000-02-16 Cartoni S P A Counterbalance structure for cameras moving out of the vertical plane
GB2340103B (en) * 1998-07-29 2002-05-15 Cartoni S P A Vertical plane counterbalancing structure, particularly for support heads for television or motion pictures cameras
NL2001125C2 (en) * 2007-12-21 2009-06-23 Univ Delft Tech Device for exerting a force on a load.
WO2009082207A1 (en) * 2007-12-21 2009-07-02 Technische Universiteit Delft Apparatus for exercising a force on a load
US8152144B2 (en) 2007-12-21 2012-04-10 Anchis Technology B.V. Apparatus for exercising a force on a load
CN101925771B (en) * 2007-12-21 2013-05-01 安奇斯技术有限责任公司 Apparatus for exercising force on load

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