GB672705A - Improvements in the manufacture of bowl-type refractors - Google Patents
Improvements in the manufacture of bowl-type refractorsInfo
- Publication number
- GB672705A GB672705A GB13549/49A GB1354949A GB672705A GB 672705 A GB672705 A GB 672705A GB 13549/49 A GB13549/49 A GB 13549/49A GB 1354949 A GB1354949 A GB 1354949A GB 672705 A GB672705 A GB 672705A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ribs
- splitting
- trough
- flanges
- glass
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V3/00—Globes; Bowls; Cover glasses
- F21V3/02—Globes; Bowls; Cover glasses characterised by the shape
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/02—Refractors for light sources of prismatic shape
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
672,705. Glass manufacture. HOLOPHANE, Ltd., and HOLMES, J. G. May 19, 1950 [May 20, 1949], No. 13549/49. Class 56. [Also in Group V] A trough-like bowl refractor for a tubular lamp is made of glass or other mouldable transparent material by first moulding a closed-sectioned hollow tapering member 1, Fig. 1, with internal longitudinal ribs 2, and then splitting the member longitudinally. The axial withdrawal of the moulding-tool, for the inside of the member, is effected without fouling the ribs, so that bolder ribs 2 may be provided than would be possible if the article were moulded as a trough, and the tool withdrawn at right angles to, the axis. The member is moulded with lines of weakness 5 to facilitate the splitting which, in the case of glass, may be effected by cutting with a diamond or grinding wheel, or by applying a hot wire. Usually two split halves 10, Fig. 3, would be joined end to end but more than two parts may be assembled in line, or, one part only may be used. The bottom of the tapered member 1 may be integrally closed and provided with radiating ribs 4 or the end closures of the trough may be separately applied and may be of metal. The lines of weakness 5 are flanked by flanges 7, any roughnesses being ground off after splitting. The flanges 7 may be used to secure the halves in a lantern, and the flanges 8 may be clipped together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB13549/49A GB672705A (en) | 1949-05-20 | 1949-05-20 | Improvements in the manufacture of bowl-type refractors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB13549/49A GB672705A (en) | 1949-05-20 | 1949-05-20 | Improvements in the manufacture of bowl-type refractors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB672705A true GB672705A (en) | 1952-05-28 |
Family
ID=10024955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB13549/49A Expired GB672705A (en) | 1949-05-20 | 1949-05-20 | Improvements in the manufacture of bowl-type refractors |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB672705A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007087947A1 (en) * | 2006-02-01 | 2007-08-09 | Zumtobel Lighting Gmbh | Elongate luminaire with end regions which are tapered in cross section |
| EP3034934A1 (en) * | 2014-12-16 | 2016-06-22 | Many Wain Enterprise Co., Ltd. | Nonlinear optical assembly of an alert light |
-
1949
- 1949-05-20 GB GB13549/49A patent/GB672705A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007087947A1 (en) * | 2006-02-01 | 2007-08-09 | Zumtobel Lighting Gmbh | Elongate luminaire with end regions which are tapered in cross section |
| CN101371072B (en) * | 2006-02-01 | 2010-11-03 | 宗拓贝尔照明器材有限公司 | Elongate luminaire with end regions which are tapered in cross section |
| KR101398803B1 (en) * | 2006-02-01 | 2014-07-03 | 춤토벨 라이팅 게엠베하 | Elongate luminaire with end regions which are tapered in cross-section |
| EP3034934A1 (en) * | 2014-12-16 | 2016-06-22 | Many Wain Enterprise Co., Ltd. | Nonlinear optical assembly of an alert light |
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