WO1997024964A1 - Procede de fabrication d'objets en argent pur, en particulier de couverts de table, et couverts ainsi obtenus - Google Patents
Procede de fabrication d'objets en argent pur, en particulier de couverts de table, et couverts ainsi obtenus Download PDFInfo
- Publication number
- WO1997024964A1 WO1997024964A1 PCT/CH1996/000247 CH9600247W WO9724964A1 WO 1997024964 A1 WO1997024964 A1 WO 1997024964A1 CH 9600247 W CH9600247 W CH 9600247W WO 9724964 A1 WO9724964 A1 WO 9724964A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pure silver
- blank
- silver
- objects
- cooling
- 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.)
- Ceased
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/60—Making other particular articles cutlery wares; garden tools or the like
- B21D53/62—Making other particular articles cutlery wares; garden tools or the like spoons; table forks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
- B24B19/001—Single-purpose machines or devices for particular grinding operations not covered by any other main group for table cutlery
Definitions
- the present invention relates to a process for manufacturing pure silver objects, in particular table cutlery, as well as the table cutlery thus obtained.
- Silver cutlery has been known for a long time. Spoons and forks are usually made entirely from the same piece of metal, while knives usually have a steel blade and only a silver handle.
- Pure silver cutlery has not been available on the market, mainly for two reasons. The first is that pure silver rightly has a reputation for being a metal too soft to make cutlery, especially forks. The second reason is that the regulation of the trade in precious metals prohibited in Switzerland the sale of objects not corresponding to a legal title (800 and / or 925) in general.
- the silver cutlery was thus mainly made of 800 and 925 silver (Sterling), the remaining 200 and respectively 75 per 1000 being reserved for the metal responsible for bringing hardness to the object, copper in general.
- the Vickers scale In order to measure the hardness, the Vickers scale (HV) is used in this area in particular. It is generally accepted that a hardness of 114 to 115 HV is sufficient to make a spoon while for a fork, it is necessary to reach 140 HV because of the teeth.
- the raw material is in the form of a laminated silver sheet (whatever title it chooses) a few millimeters thick.
- the coarse outline of the cutlery is then cut from the sheet using, for example, a punch press.
- the rough cover, the blank then has a length and a width which are less than the final dimensions, the thickness being more important at this stage than at the end of the process.
- the new lamination invariably causes the cover to crack or rupture if it is not itself preceded by a heating operation.
- This intermediate heating is considered essential and is applied by all manufacturers in the sector.
- pure silver objects have a very important advantage over others, they can be remelted and pure metal can be used as is, especially for remaking ingots.
- the intrinsic value of the money contained in the cutlery is thus the same at the purchase as at the sale and the part of the price relating to the design or the invoice, which are dependent on the modes, is reduced.
- the penalizing anomaly which consists in that the seller of a new object is obliged to include in its price the value of the silver metal contained in the object, while the same object sold a few years later will only be bought at a price lower than that of the silver metal, the quantity of which has not changed in the meantime.
- the purpose of the present intention is to propose a manufacturing process making it possible to produce laminated objects in pure silver whose hardness is comparable to that of objects produced with titles 800 or 925, in any case is this hardness sufficient to manufacture forks, spoons and knife handles in pure silver, ensuring their functionality in accordance with the usual standard.
- the manufacturing method according to the invention is set out in claim 1.
- the present invention also relates to a table cutlery, that is to say spoon or fork, entirely made of pure silver and having a hardness greater than 110 HV, as well as a knife comprising a blade and a handle, the peripheral part of which of the handle is both pure silver and in one piece.
- the rough blanks are cut using, for example, a punch press.
- the rough blanks are then softened by eliminating around their entire periphery, that is to say on their edge, a range of 1 to 2 tenths of a millimeter. It is in fact in this outer range that the tensions created by the cutting are concentrated and it is these internal tensions which lead to cracking or breaking during the second rolling. By eliminating the strip of material in which the tensions are concentrated, it also eliminates the need to heat the blank before proceeding to the second rolling, as has been said in the introductory part of this description.
- softening is carried out on abrasive strips, taking care that the temperature of the metal does not in any case rise above 60 degrees C.
- a cold water jet directed towards the contact area between the abrasive belt and the blank.
- the parts of the blanks corresponding to the spoon and the teeth are cold rolled and cut.
- the mastering of the raw forms for example on a 250 ton friction pendulum, can then take place.
- a hardening is carried out in an electroplating bath, this in particular to harden the parts of small section such as in particular the teeth of the forks.
- the scrap of pure silver sheet which results from the cutting of the blanks can be used without other as anodes in electroplating baths. This makes it possible to make one-piece knife handles made entirely by electroplating. The knife blade can then be made integral with the core of the handle before any other operation.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Table Equipment (AREA)
Abstract
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP96920673A EP0837642A1 (fr) | 1996-01-04 | 1996-07-05 | Procede de fabrication d'objets en argent pur, en particulier de couverts de table, et couverts ainsi obtenus |
| AU61858/96A AU6185896A (en) | 1996-01-04 | 1996-07-05 | Method for manufacturing objects from pure silver, particularly silver tableware, and the objects obtained thereby |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH15/96 | 1996-01-04 | ||
| CH1596 | 1996-01-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1997024964A1 true WO1997024964A1 (fr) | 1997-07-17 |
Family
ID=4177474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CH1996/000247 Ceased WO1997024964A1 (fr) | 1996-01-04 | 1996-07-05 | Procede de fabrication d'objets en argent pur, en particulier de couverts de table, et couverts ainsi obtenus |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0837642A1 (fr) |
| AU (1) | AU6185896A (fr) |
| WO (1) | WO1997024964A1 (fr) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB144179A (en) * | 1919-10-27 | 1920-06-10 | John Ernest Cooper | Improvements in or relating to the manufacture of spoons and forks |
| US1633783A (en) * | 1925-03-25 | 1927-06-28 | Latrobe Electric Steel Company | Cutlery article |
| US1962279A (en) * | 1933-04-20 | 1934-06-12 | Howard R Lott | Process of making flatware |
| GB883022A (en) * | 1957-03-14 | 1961-11-22 | Firth Vickers Stainless Steels Ltd | Improvements in and relating to the manufacture of metal articles of different thicknesses |
| JPS6368366A (ja) * | 1986-09-08 | 1988-03-28 | Taiho Ind Co Ltd | 研磨方法 |
| EP0332956A2 (fr) * | 1988-03-15 | 1989-09-20 | Linde Aktiengesellschaft | Procédé et dispositif pour poncer et/ou polir une laque à des températures inférieures à la température ambiante |
-
1996
- 1996-07-05 WO PCT/CH1996/000247 patent/WO1997024964A1/fr not_active Ceased
- 1996-07-05 AU AU61858/96A patent/AU6185896A/en not_active Abandoned
- 1996-07-05 EP EP96920673A patent/EP0837642A1/fr not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB144179A (en) * | 1919-10-27 | 1920-06-10 | John Ernest Cooper | Improvements in or relating to the manufacture of spoons and forks |
| US1633783A (en) * | 1925-03-25 | 1927-06-28 | Latrobe Electric Steel Company | Cutlery article |
| US1962279A (en) * | 1933-04-20 | 1934-06-12 | Howard R Lott | Process of making flatware |
| GB883022A (en) * | 1957-03-14 | 1961-11-22 | Firth Vickers Stainless Steels Ltd | Improvements in and relating to the manufacture of metal articles of different thicknesses |
| JPS6368366A (ja) * | 1986-09-08 | 1988-03-28 | Taiho Ind Co Ltd | 研磨方法 |
| EP0332956A2 (fr) * | 1988-03-15 | 1989-09-20 | Linde Aktiengesellschaft | Procédé et dispositif pour poncer et/ou polir une laque à des températures inférieures à la température ambiante |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 012, no. 292 (M - 729) 10 August 1988 (1988-08-10) * |
Also Published As
| Publication number | Publication date |
|---|---|
| AU6185896A (en) | 1997-08-01 |
| EP0837642A1 (fr) | 1998-04-29 |
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