GB662109A - Improvements in and relating to drawing instruments - Google Patents
Improvements in and relating to drawing instrumentsInfo
- Publication number
- GB662109A GB662109A GB1783649A GB1783649A GB662109A GB 662109 A GB662109 A GB 662109A GB 1783649 A GB1783649 A GB 1783649A GB 1783649 A GB1783649 A GB 1783649A GB 662109 A GB662109 A GB 662109A
- Authority
- GB
- United Kingdom
- Prior art keywords
- balls
- holes
- arms
- bolt
- head
- 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
- B43L9/00—Circular curve-drawing or like instruments
- B43L9/16—Features common to compasses, dividers, and callipers
- B43L9/20—Pivots
Landscapes
- Pivots And Pivotal Connections (AREA)
- Rolling Contact Bearings (AREA)
Abstract
662,109. Compasses and dividers. HILGER & WATTS, Ltd., and COMPTON, A. H. S. T. July 4, 1950 [July 6, 1949], No. 17836/49. Class 97 (iii). The arms a, b, Fig. 2, of a pair of compasses or dividers are pivoted on a bolt c supported in a forked member d carrying the head e. The arms a, b are recessed to receive conical bearings f. Each arm is provided with an annular steel insert h, the opposing plane surfaces of the inserts being separated by ball bearings g mounted in a flexible plate-like member k pivoted on the bolt c and having a tongue l engaging a hole m in the head e. As shown in Fig. 3, the member k is provided with an even number of holes of slightly smaller diameter than the balls g; alternate balls are mounted in the holes on opposite sides of the member. A bolt i is provided between the lower ends of the fork d to adjust the pressure exerted on the cone bearings and on the balls and the member k. The head e is by this arrangement maintained central with respect to the arms. The member k may be flat or corrugated and may have dishings about the holes, or the holes may be bevelled. According to the Provisional Specification the balls may ride in circular grooves in the plane bearing surfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1783649A GB662109A (en) | 1949-07-06 | 1949-07-06 | Improvements in and relating to drawing instruments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1783649A GB662109A (en) | 1949-07-06 | 1949-07-06 | Improvements in and relating to drawing instruments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB662109A true GB662109A (en) | 1951-11-28 |
Family
ID=10102064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1783649A Expired GB662109A (en) | 1949-07-06 | 1949-07-06 | Improvements in and relating to drawing instruments |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB662109A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116336330A (en) * | 2023-04-18 | 2023-06-27 | 重庆欣荣土地房屋勘测技术研究所有限责任公司 | Quick centering and leveling device for surveying instrument |
-
1949
- 1949-07-06 GB GB1783649A patent/GB662109A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116336330A (en) * | 2023-04-18 | 2023-06-27 | 重庆欣荣土地房屋勘测技术研究所有限责任公司 | Quick centering and leveling device for surveying instrument |
| CN116336330B (en) * | 2023-04-18 | 2024-01-05 | 重庆欣荣土地房屋勘测技术研究所有限责任公司 | Quick centering and leveling device for surveying instrument |
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