GB663025A - Improvements connected with the protractor heads of drawing machines - Google Patents
Improvements connected with the protractor heads of drawing machinesInfo
- Publication number
- GB663025A GB663025A GB3162649A GB3162649A GB663025A GB 663025 A GB663025 A GB 663025A GB 3162649 A GB3162649 A GB 3162649A GB 3162649 A GB3162649 A GB 3162649A GB 663025 A GB663025 A GB 663025A
- Authority
- GB
- United Kingdom
- Prior art keywords
- plate
- lever
- pawl
- scale
- index
- 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
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
- Length-Measuring Instruments Using Mechanical Means (AREA)
Abstract
663,025. Draughting-machines. SMITH, J. W., and GRAF, V. Dec. 9, 1949, No. 31626/49. Class 97 (iii). In a protractor head for parallel arm motion drawing machines in which a holder 13 for rules 14, a plate 10 provided with an index 15 or a scale and a knob 11 are mounted together for rotation relative to a non-rotatable base-plate 3 carried by the parallel arms 1 of the machine, the base-plate 3 carries a scale or index member 5 which is adjustable thereon and co-operates with the index 15, a notched disc 9 normally fixed relative to the scale member 5 and baseplate 3 located beneath the plate 10 being selectively engaged by a lever-operated pawl 16 carried by plate 10. The lever 17 loaded by spring 25 is mounted flat against the upper side of plate 10, and has a peg 21 extending through an opening 22 in the plate 10 to engage the pawl 16, the opening 22 being covered by the lever 17. The disc 9 is notched to correspond with the commonly used angles and lies in a recess in scale member 5, being rigid therewith. The plate 10 covers the recess. A locking lever 27 pivoted at 28 has a shoulder 30 adapted to engage shoulder 31 on lever 17 to maintain the pawl 16 out of contact with disc 9. On'pressing the thumb-piece 18, an arm 33 on the head of lever 17 disengages the locking lever. The pawl 16 and lever 17 are pivoted on a common pin 19. Adjustable stops 35 are provided on the scale member 5 as described in Specification 663,024.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3162649A GB663025A (en) | 1949-12-09 | 1949-12-09 | Improvements connected with the protractor heads of drawing machines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3162649A GB663025A (en) | 1949-12-09 | 1949-12-09 | Improvements connected with the protractor heads of drawing machines |
Publications (1)
Publication Number | Publication Date |
---|---|
GB663025A true GB663025A (en) | 1951-12-12 |
Family
ID=10325978
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3162649A Expired GB663025A (en) | 1949-12-09 | 1949-12-09 | Improvements connected with the protractor heads of drawing machines |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB663025A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2364774A1 (en) * | 1976-09-21 | 1978-04-14 | Kuhlmann Kg Franz | Draughting machine head - has central bearing trunnion accommodating baseplate, rule holder and locking mechanism disc |
-
1949
- 1949-12-09 GB GB3162649A patent/GB663025A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2364774A1 (en) * | 1976-09-21 | 1978-04-14 | Kuhlmann Kg Franz | Draughting machine head - has central bearing trunnion accommodating baseplate, rule holder and locking mechanism disc |
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