GB602184A - Improvements in drafting and like machines - Google Patents
Improvements in drafting and like machinesInfo
- 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
Links
- 238000006073 displacement reaction Methods 0.000 abstract 1
- 230000000284 resting effect Effects 0.000 abstract 1
- 230000000717 retained effect Effects 0.000 abstract 1
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.
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)
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 |
-
1945
- 1945-09-03 GB GB2265445A patent/GB602184A/en not_active Expired
Cited By (2)
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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