GB602184A - Improvements in drafting and like machines - Google Patents

Improvements in drafting and like machines

Info

Publication number
GB602184A
GB602184A GB2265445A GB2265445A GB602184A GB 602184 A GB602184 A GB 602184A GB 2265445 A GB2265445 A GB 2265445A GB 2265445 A GB2265445 A GB 2265445A GB 602184 A GB602184 A GB 602184A
Authority
GB
United Kingdom
Prior art keywords
lever
ring
disc
tumblers
secured
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
GB2265445A
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.)
MATTHEWS WALTER R
RESEARCH ENGINEERS Ltd
Original Assignee
MATTHEWS WALTER R
RESEARCH ENGINEERS Ltd
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 MATTHEWS WALTER R, RESEARCH ENGINEERS Ltd filed Critical MATTHEWS WALTER R
Priority to GB2265445A priority Critical patent/GB602184A/en
Publication of GB602184A publication Critical patent/GB602184A/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
    • B43L13/08—Protractor heads

Landscapes

  • Knives (AREA)

Abstract

602,184. Draughting-machines. RESEARCH ENGINEERS, Ltd., MATTHEWS, W. R., and GLADSTONE, W. S. Sept. 3, 1945, No. 22654. [Class 97 (iii)] A member 20 carrying one or more linear scales 8 is secured to a spindle 19 mounted on a supporting head on a parallel motion device and is retained in a desired angular position by frictional means releasable by finger-tip pressure either radial or angular on a ring 1, freely mounted between the operating knob 2 and the head. A protractor 4 is secured to the head and a disc 6, bearing indicating marks to the spindle. The retaining means comprises a lever 9 pivoted about a knife edge 10 resting on the disc 6, the lever being biassed by a blade spring 12 to engage an adjustable screw 11 operating a brake-shoe 7 so as to bring a friction disc 3 secured to the protractor up against the disc 6. The release means comprises a pair of tumblers 13 having spherical ends 16 mounted in holes in the ring 1 on a diameter at right angles to the drawing, the opposite ends 14 being flat and mounted between the lever 9 and a bearing plate 15 on the disc 6. Movement of the ring 1 causes angular displacement of the tumblers, thus raising the inner end of the lever 9 so as to release the brake shoe 7 ; on release of pressure on the ring it is returned by the spring 12 acting through the lever 9 to a position in which the tumblers are upright. The ring 1 may be provided with knobs 21 or depressions or may be knurled.
GB2265445A 1945-09-03 1945-09-03 Improvements in drafting and like machines Expired GB602184A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2265445A GB602184A (en) 1945-09-03 1945-09-03 Improvements in drafting and like machines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2265445A GB602184A (en) 1945-09-03 1945-09-03 Improvements in drafting and like machines

Publications (1)

Publication Number Publication Date
GB602184A true GB602184A (en) 1948-05-21

Family

ID=10182932

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2265445A Expired GB602184A (en) 1945-09-03 1945-09-03 Improvements in drafting and like machines

Country Status (1)

Country Link
GB (1) GB602184A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2915828A (en) * 1956-09-04 1959-12-08 David D Miller Portable drafting machine
US10866610B2 (en) * 2015-10-20 2020-12-15 Sz Dji Osmo Technology Co., Ltd. Knob structure and follow focus remote controller using same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2915828A (en) * 1956-09-04 1959-12-08 David D Miller Portable drafting machine
US10866610B2 (en) * 2015-10-20 2020-12-15 Sz Dji Osmo Technology Co., Ltd. Knob structure and follow focus remote controller using same

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