Method of making a bent razor blade

Patent metadata

Field	Value
Publication number	US-10413962-B2
Application number	US-201815980150-A
Country	US
Kind code	B2
Filing date	May 15, 2018
Priority date	May 5, 2008
Publication date	Sep 17, 2019
Grant date	Sep 17, 2019

Abstract

A method for making a bent razor blade is disclosed. The method includes: providing an elongated strip of stainless steel that can be 0.076 mm thick; hardening the strip; providing a cutting edge along an edge of the strip and providing coating(s) on the cutting edge. The stainless steel has a carbon content less than 0.60% and preferably between 0.45% and 0.55% by weight. The strip is separated lengthwise into discrete razor blades. The bent portion of the razor blade is then formed using a swivel bending process.

First claim

What is claimed is:

1. A method of making a razor blade, comprising:
providing a stainless steel strip having a carbon content in a range 0.45% to 0.55%; forming a cutting edge along a front edge of the strip and cutting the strip into a lengthwise extending portion;
providing a forming tool having:
a first jaw;
a second jaw that includes a parti-cylindrical surface, wherein the parti-cylindrical surface of the second jaw of the forming tool has an axis; and
a nose having an arcuate contact surface;
clamping the lengthwise extending portion of the strip relative to the tool at a position such that the cutting edge is between the first jaw and the second jaw and a back edge portion of the strip extends outwardly from and beyond the parti-cylindrical surface of the second jaw of the forming tool;
disposing the arcuate contact surface of the nose of the forming tool in contact with a first surface of the lengthwise extending portion of the strip adjacent the first jaw at a position adjacent the parti-cylindrical surface; and
moving the nose of the forming tool along the parti-cylindrical surface of the second jaw of the forming tool with the surface of the lengthwise extending portion of the strip adjacent the first jaw in contact with the arcuate contact surface of the nose of the forming tool and the lengthwise extending portion has a second surface opposed to the first surface adjacent the first jaw in contact with the parti-cylindrical surface of the second jaw of the forming tool;
wherein the step of moving the nose of the forming tool along the parti-cylindrical surface of the second jaw of the forming tool includes moving the nose around the axis of the parti-cylindrical surface of the second jaw; and
wherein the nose of the forming tool is pivotally mounted about a nose axis, and additionally rotates about the nose axis relative to the lengthwise extending portion of the strip during the moving step.

2. The method of claim 1 , wherein during a majority of the step of moving the nose of the forming tool along the parti-cylindrical surface of the second jaw of the forming tool, a portion of the arcuate contact surface of the nose of the forming tool is separated from a portion of the parti-cylindrical surface of the second jaw of the forming tool.

3. The method of claim 1 , wherein the nose of the forming tool rotates relative to the axis of the parti-cylindrical surface of the second jaw during the moving step.

4. The method of claim 1 , wherein the arcuate contact surface of the nose of the forming tool is disposed in contact with the first surface of the lengthwise extending portion of the strip adjacent the first jaw at a predetermined contact pressure.

5. The method of claim 1 , wherein, during a majority of the moving step, the arcuate contact surface of the nose of the forming tool contacts the first surface of the lengthwise extending portion of the strip adjacent the first jaw without sliding relative to the surface.

Assignees

• Edgewell Personal Care Brands Llc

Inventors

• Bykowski Henryk
• Fischer Stephan
• Thoene Jochen

Classifications

• B26B21/565

  Bent razor blades; Razor blades with bent carriers · CPC title

• B26B21/4075

  Mounting devices · CPC title

• B21D53/645 Primary

  safety razor blades · CPC title

• B21D5/042

  With a rotational movement of the bending blade · CPC title

• B23P15/44

  scraping or shaving tools · CPC title