GB815031A - The self setting horizontal blackboard ruler - Google Patents

The self setting horizontal blackboard ruler

Info

Publication number
GB815031A
GB815031A GB819957A GB819957A GB815031A GB 815031 A GB815031 A GB 815031A GB 819957 A GB819957 A GB 819957A GB 819957 A GB819957 A GB 819957A GB 815031 A GB815031 A GB 815031A
Authority
GB
United Kingdom
Prior art keywords
cable
ruler
blackboard
pulleys
board
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
GB819957A
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.)
HENRY HARGRAVE
Original Assignee
HENRY HARGRAVE
Filing date
Publication date
Application filed by HENRY HARGRAVE filed Critical HENRY HARGRAVE
Publication of GB815031A publication Critical patent/GB815031A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L13/00—Drawing instruments, or writing or drawing appliances or accessories not otherwise provided for
    • B43L13/02—Draughting machines or drawing devices for keeping parallelism
    • B43L13/04—Guides for rulers
    • B43L13/046—Guides for rulers with cables
    • 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

Abstract

815,031. Draughting machines. HARGRAVE, H. April 1, 1957 [March 13, 1957], No. 8199/57. Class 97(3) A ruler is supported for parallel movement over a blackboard by a cable system passing round pulleys at the corners of the board, parts of the cable passing through flexible tubular housings which butt against adjustable end stops by which the cable tension may be adjusted. As shown in Fig. 8, the cable supports brackets 2, in which the ruler is pivotally mounted to be movable towards and away from the board, as well as balance weights 7 and passes round pulleys at 1, 3. Between the boxes containing the pulleys 3 the cable passes through flexible tubes which butt against the boxes and against end stops screw threaded, for axial adjustment, into tubular members 4. The two halves of the cable circuit may thus be independently adjusted for levelling the ruler initially. The brackets 2 carry rollers which bear on the blackboard and on the underside of a cover enclosing the cable and balance weights.
GB819957A 1957-03-13 The self setting horizontal blackboard ruler Expired GB815031A (en)

Publications (1)

Publication Number Publication Date
GB815031A true GB815031A (en) 1959-06-17

Family

ID=1629255

Family Applications (1)

Application Number Title Priority Date Filing Date
GB819957A Expired GB815031A (en) 1957-03-13 The self setting horizontal blackboard ruler

Country Status (1)

Country Link
GB (1) GB815031A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112606597A (en) * 2020-12-24 2021-04-06 吉林建筑大学 English classroom teaching is with supplementary blackboard writing marking tool

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112606597A (en) * 2020-12-24 2021-04-06 吉林建筑大学 English classroom teaching is with supplementary blackboard writing marking tool

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