EP0011452B1 - Method for the manufacture of razors and razor assembly obtained by this method - Google Patents
Method for the manufacture of razors and razor assembly obtained by this method Download PDFInfo
- Publication number
- EP0011452B1 EP0011452B1 EP19790302515 EP79302515A EP0011452B1 EP 0011452 B1 EP0011452 B1 EP 0011452B1 EP 19790302515 EP19790302515 EP 19790302515 EP 79302515 A EP79302515 A EP 79302515A EP 0011452 B1 EP0011452 B1 EP 0011452B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blade member
- die
- support member
- blade
- hole
- 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
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
- B26B21/00—Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor
- B26B21/40—Details or accessories
- B26B21/4068—Mounting devices; Manufacture of razors or cartridges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K25/00—Uniting components to form integral members, e.g. turbine wheels and shafts, caulks with inserts, with or without shaping of the components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
- B26B21/00—Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor
- B26B21/54—Razor-blades
Definitions
- This invention relates to the manufacture of razors, and more particularly to a method of permanently attaching a blade member to a support.
- Welding has the disadvantage that the heat necessarily generated alters the metallurgical structure of the blade member around the weld zone and thereby introduces the risk of corrosion of the blade member.
- the formation of holes in the blade member involves additional complications in manufacture of the blade member.
- the present invention provides a method of attachment which avoids the above stated disadvantages and which permits a wide variety of materials, metallic and non-metallic to be employed for the support member.
- a method of attaching a razor blade member to a support member of cold deformable material in which the blade member has one surface contacted by a die having at least one die-hole in its blade supporting surface, and the support member is placed against the opposite surface of the blade member and is subjected, by a punch, to compressive forces sufficient to effect cold deformation of the support member, causing it to pierce and extrude through the blade member into the die-hole, the material thus extruded through the blade member subsequently being riveted over to secure the members together.
- the method of the invention thus avoids the risk of metallurgical degradation inherent in welding techniques.
- the conventional rivetting techniques mentioned above involve the provisions of pre-formed holes in the blade member, and pre-formed projections (rivets) on the support member, which must be accurately aligned with the blade member holes and accurately controlled in their cross-section to produce a good fit in the holes. These complications are avoided by the method of the invention since the extruded projections make their own holes in the blade member. Furthermore, it is possible to produce 'rivet' diameters and holes smaller than would normally be possible in the case of pre-formed holes formed by conventional mass production techniques.
- a narrow, imperforate blade member 1 is formed by an imperforate strip of hardened stainless steel sharpened to a cutting edge at 2, and is to be attached to a blade support 3 of wire-like form, and of somewhat narrower width than the blade member 1.
- the support 3 may, for example, be of aluminium or aluminium alloy, steel, brass or synthetic plastics material, such as polyester.
- the press tool comprises a die 4 having a shallow recess 5 to receive the blade member, and is formed with a number of through holes 6, spaced apart longitudinally of the blade member, and opening into the main surface of the recess against which the blade member is supported.
- the tool also comprises a platen 7 having a rectangular slot 8 to locate and confine the support member, and a ram 9 which is a close fit in the slot 8.
- the inner surface of the ram is shown here as having a head portion 11 of lesser width than the remainder of the ram, since it is desired to form a channel at the underside of the support member, but the head portion could take other forms.
- the ram With the blade member and support member located as shown in Figure 1, the ram is advanced to apply high compressive forces to the support member to effect plastic deformation thereof.
- the "hydrostatic pressures" thus generated in the support material cause it to pierce the blade strips at its unsupported points opposite the holes 6 and to be extruded through the blade member, a slug 1A of the blade material being punched out and carried upwardly by the extruded material, as illustrated at 12 in Figure 2.
- the partially completed assembly is removed from the press tool leaving the slug of blade material in the die hole, and the extruded pips 12 are then riveted over to form retaining heads 13, as shown in Figure 3, to complete the assembly.
- the blade member has an overall length of 38 mm, a width of 1.15 mm and is 0.038 mm thick, and the die has 18 holes equally spaced apart, each hole being of 0.25 mm diameter.
- a single punch operates over substantially the whole of the undersurface of the support 3. In this case it will usually be necessary to confine closely the longitudinal side edges of the support material so as to prevent lateral deformation thereof.
- the punch 31 is formed with discrete punch portions formed by cylindrical pins 32, each aligned with a respective die hole 6. Lateral support for the pins is provided by a pressure pad 33 through which the pins slide during the piercing and extruding operation.
- the pins 32 are of larger diameter than the die holes with which they co-operate.
- support materials having a hardness of 100 VPN or more.
- Units thus formed can be assembled into razor heads of metal or plastics material having a separately formed guard, or the support member may be an integral part of such a razor head.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Punching Or Piercing (AREA)
- Forging (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Insertion Pins And Rivets (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB7844109 | 1978-11-10 | ||
GB4410978 | 1978-11-10 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0011452A1 EP0011452A1 (en) | 1980-05-28 |
EP0011452B1 true EP0011452B1 (en) | 1982-12-15 |
Family
ID=10500964
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19790302515 Expired EP0011452B1 (en) | 1978-11-10 | 1979-11-09 | Method for the manufacture of razors and razor assembly obtained by this method |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0011452B1 (el) |
JP (1) | JPS5570427A (el) |
AR (1) | AR218786A1 (el) |
BR (1) | BR7907290A (el) |
DE (1) | DE2964309D1 (el) |
ES (1) | ES485771A1 (el) |
GR (1) | GR73601B (el) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2104430B (en) * | 1981-08-24 | 1985-05-09 | Gillette Co | Securing a razor blade to a support |
US7131202B2 (en) * | 2004-03-11 | 2006-11-07 | The Gillette Company | Cutting members for shaving razors with multiple blades |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3274686A (en) * | 1965-03-02 | 1966-09-27 | Eversharp Inc | Laminated razor blade for injector razor |
GB1327381A (en) * | 1969-09-27 | 1973-08-22 | Tolwood Multifasteners | Nut and panel assembly |
-
1979
- 1979-11-02 GR GR60394A patent/GR73601B/el unknown
- 1979-11-07 ES ES485771A patent/ES485771A1/es not_active Expired
- 1979-11-09 AR AR27883479A patent/AR218786A1/es active
- 1979-11-09 EP EP19790302515 patent/EP0011452B1/en not_active Expired
- 1979-11-09 JP JP14530379A patent/JPS5570427A/ja active Pending
- 1979-11-09 BR BR7907290A patent/BR7907290A/pt unknown
- 1979-11-09 DE DE7979302515T patent/DE2964309D1/de not_active Expired
Also Published As
Publication number | Publication date |
---|---|
ES485771A1 (es) | 1980-07-01 |
DE2964309D1 (en) | 1983-01-20 |
JPS5570427A (en) | 1980-05-27 |
GR73601B (el) | 1984-03-26 |
EP0011452A1 (en) | 1980-05-28 |
AR218786A1 (es) | 1980-06-30 |
BR7907290A (pt) | 1980-07-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): DE FR NL |
|
17P | Request for examination filed |
Effective date: 19800611 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Designated state(s): DE FR NL |
|
REF | Corresponds to: |
Ref document number: 2964309 Country of ref document: DE Date of ref document: 19830120 |
|
ET | Fr: translation filed | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19840601 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19840731 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Effective date: 19840801 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |